A radar system with enhanced processing for increased contrast ratio, improved angular separability and accuracy, and elimination of ghost targets. The radar system is equipped with transmitters, receivers, pluralities of transmit antennas, and pluralities of receive antennas. The enhanced processing chain on-board the radar system iteratively detects target(s) by first finding the strongest target, subtracting the estimated received signal from the detected target, and repeating the process for subsequent targets until a predefined number of iterations is completed or an exit condition is tripped. The enhanced processing chain's subtraction increases the contrast ratio of detectable targets. The detection is thus refined by determining optimal azimuth, elevation, gain, and phase of each detection through a joint optimization of all detections. The subtraction and refinement aid in eliminating ghost targets by removing sidelobe signals and residual errors that cause ghost targets to appear.
G01S 13/72 - Systèmes radar de poursuite; Systèmes analogues pour la poursuite en deux dimensions, p.ex. combinaison de la poursuite en angle et de celle en distance, radar de poursuite pendant l'exploration
G01S 7/41 - DÉTERMINATION DE LA DIRECTION PAR RADIO; RADIO-NAVIGATION; DÉTERMINATION DE LA DISTANCE OU DE LA VITESSE EN UTILISANT DES ONDES RADIO; LOCALISATION OU DÉTECTION DE LA PRÉSENCE EN UTILISANT LA RÉFLEXION OU LA RERADIATION D'ONDES RADIO; DISPOSITIONS ANALOGUES UTILISANT D'AUTRES ONDES - Détails des systèmes correspondant aux groupes , , de systèmes selon le groupe utilisant l'analyse du signal d'écho pour la caractérisation de la cible; Signature de cible; Surface équivalente de cible
G01S 13/88 - Radar ou systèmes analogues, spécialement adaptés pour des applications spécifiques
G01S 7/28 - DÉTERMINATION DE LA DIRECTION PAR RADIO; RADIO-NAVIGATION; DÉTERMINATION DE LA DISTANCE OU DE LA VITESSE EN UTILISANT DES ONDES RADIO; LOCALISATION OU DÉTECTION DE LA PRÉSENCE EN UTILISANT LA RÉFLEXION OU LA RERADIATION D'ONDES RADIO; DISPOSITIONS ANALOGUES UTILISANT D'AUTRES ONDES - Détails des systèmes correspondant aux groupes , , de systèmes selon le groupe - Détails des systèmes à impulsions
G01S 13/524 - Discrimination entre objets fixes et mobiles ou entre objets se déplaçant à différentes vitesses utilisant la transmission de trains discontinus d'ondes modulées par impulsions basée sur le décalage de phase ou de fréquence résultant du mouvement des objets, avec référence aux signaux transmis, p.ex. MTI cohérent
G01S 13/522 - Discrimination entre objets fixes et mobiles ou entre objets se déplaçant à différentes vitesses utilisant la transmission de trains discontinus d'ondes modulées par impulsions
2.
N-POINT COMPLEX FOURIER TRANSFORM STRUCTURE HAVING ONLY 2N REAL MULTIPLIES, AND OTHER MATRIX MULTIPLY OPERATIONS
An integrated circuit chip implementing multiplication of an MxN element matrix with an N-element vector to obtain an M-element product by combining the vector with rows of bits of the same significance selected from the matrix one bit-row at a time to form partial products, exploiting the fact that the same potential combinations are needed for all bit-rows and all matrix rows to precompute all of the combinations once and for all, and combining selected partial products for different bit place-significance with a shift-and-add operation only once for each of the M product elements, thereby effectively using only M multiply-equivalent structures. An N-point Complex Fourier Transform can therefore be claimed which only needs 2N real multiplies and the product of an NxN matrix with another NxN matrix requires only N2 multiplies.
H04B 1/00 - TRANSMISSION - Détails des systèmes de transmission non caractérisés par le milieu utilisé pour la transmission
G01S 7/02 - DÉTERMINATION DE LA DIRECTION PAR RADIO; RADIO-NAVIGATION; DÉTERMINATION DE LA DISTANCE OU DE LA VITESSE EN UTILISANT DES ONDES RADIO; LOCALISATION OU DÉTECTION DE LA PRÉSENCE EN UTILISANT LA RÉFLEXION OU LA RERADIATION D'ONDES RADIO; DISPOSITIONS ANALOGUES UTILISANT D'AUTRES ONDES - Détails des systèmes correspondant aux groupes , , de systèmes selon le groupe
G01S 13/87 - Combinaisons de plusieurs systèmes radar, p.ex. d'un radar primaire et d'un radar secondaire
H04B 1/10 - Dispositifs associés au récepteur pour limiter ou supprimer le bruit et les interférences
An exemplary radar sensing system utilizing a sparse array antenna structure provides an enhanced angular resolution to detect multiple targets with improved accuracy beyond the abilities of conventional radar. The exemplary radar system uses sparsely located antenna array elements allowing improved field of view (FOV), angular resolution, beam width, and side lobes using fewer physical antenna elements. Sparse antenna arrays allow the use of physically larger elements, larger separation between transmitter and receiver elements to reduce mutual coupling, and fewer elements to reduce necessary computations.
A radar system with a transmit pipeline transmitting radio signals, and with a receive pipeline receiving radio signals including radio signals transmitted by own transmitters and reflected from objects in an environment, and interfering radio signals transmitted by other radar systems. The receive pipeline provides interference immunity from interfering radio signals transmitted by other radar systems. The transmit pipeline and/or the receive pipeline avoid transmitting radio signals that interfere with the other radar systems. The receive pipeline includes dual polarization receive channels. The interfering radio signals are a different polarization than the radio signals transmitted by own transmitters and reflected from targets in the environment. The receive pipeline provides improved signal handling dynamic range to avoid receive channels saturating at A-to-D converter stage before the radio signal has reached the digital signal processing domain.
G01S 13/00 - Systèmes utilisant la réflexion ou la reradiation d'ondes radio, p.ex. systèmes radar; Systèmes analogues utilisant la réflexion ou la reradiation d'ondes dont la nature ou la longueur d'onde sont sans importance ou non spécifiées
G01S 13/87 - Combinaisons de plusieurs systèmes radar, p.ex. d'un radar primaire et d'un radar secondaire
G01S 7/02 - DÉTERMINATION DE LA DIRECTION PAR RADIO; RADIO-NAVIGATION; DÉTERMINATION DE LA DISTANCE OU DE LA VITESSE EN UTILISANT DES ONDES RADIO; LOCALISATION OU DÉTECTION DE LA PRÉSENCE EN UTILISANT LA RÉFLEXION OU LA RERADIATION D'ONDES RADIO; DISPOSITIONS ANALOGUES UTILISANT D'AUTRES ONDES - Détails des systèmes correspondant aux groupes , , de systèmes selon le groupe
An automotive radar using combinations of the techniques of alternating transmit- receive bursts of digitally frequency modulated millimeter wave carriers; sparse Ml MO antenna arrays with sidelobe-suppressive coarse and fine beamforming; frequency hopping; range- walking-compensated Doppler analysis and successive, and subtractive target detection in signal strength order.
G01S 7/02 - DÉTERMINATION DE LA DIRECTION PAR RADIO; RADIO-NAVIGATION; DÉTERMINATION DE LA DISTANCE OU DE LA VITESSE EN UTILISANT DES ONDES RADIO; LOCALISATION OU DÉTECTION DE LA PRÉSENCE EN UTILISANT LA RÉFLEXION OU LA RERADIATION D'ONDES RADIO; DISPOSITIONS ANALOGUES UTILISANT D'AUTRES ONDES - Détails des systèmes correspondant aux groupes , , de systèmes selon le groupe
G01S 7/487 - Extraction des signaux d'écho désirés
G01S 7/527 - Extraction des signaux d'écho désirés
G01S 7/536 - Extraction des signaux d'écho désirés
6.
METHOD AND SYSTEM FOR MULTI-CHIP OPERATION OF RADAR SYSTEMS
A multi-chip MIMO radar system includes a plurality of transmitters and a plurality of receivers. Each of the pluralities of transmitters and receivers are arranged across a plurality of chips. The multi-chip MIMO radar system includes a central processor configured to receive data from the plurality of chips. The central processor is operable to combine the information from each radar chip to produce improved range detection and angular resolvability of targets.
A radar system includes an interference manager. The interference manager detects the presence and the characteristics of interfering radio signals used by other radar systems in proximity. The interference manager also controls the operating characteristics of the radar system in response to the detected interfering signal characteristics. The interference manager selects a time slot, or a frequency band, or a time slot and a frequency band to avoid or mitigate the interfering radio signals from other radar systems.
H04B 1/10 - Dispositifs associés au récepteur pour limiter ou supprimer le bruit et les interférences
H04W 40/16 - Sélection d'itinéraire ou de voie de communication, p.ex. routage basé sur l'énergie disponible ou le chemin le plus court sur la base de la qualité d'émission ou de la qualité des canaux sur la base des interférences
A radar sensing system includes a transmitter and a receiver. The transmitter is configured to transmit a radio signal. The receiver is configured to receive radio signals that include the transmitted radio signal reflected from objects in the environment. The transmitter and receiver are configured to distribute the signal power over frequency so that it is separated from noise and impairments at DC and low frequencies as may be caused by some radar system components which introduce DC offsets and/or low frequency (e.g. flicker) noise.
A multi-chip MIMO radar system includes a plurality of transmitters and a plurality of receivers. Each of the pluralities of transmitters and receivers are arranged across a plurality of chips. The multi-chip MIMO radar system is configured to provide an exemplary chip synchronization such that the transmitters and receivers of each chip of the radar system are synchronized with the transmitters and receivers of every other chip of the radar system.
A radar sensing system for a vehicle includes a transmitter configured for installation and use on a vehicle and able to transmit radio signals. The radar sensing system also includes a receiver and a processor. The receiver is configured for installation and use on the vehicle and is able to receive radio signals that include transmitted radio signals reflected from objects in the environment. The processor samples the received radio signals to produce a sampled stream. The processor processes the sampled stream such that the sampled stream is correlated with various delayed versions of a baseband signal. The correlations are used to determine an improved range, velocity, and angle of targets in the environment.
G01S 13/60 - Systèmes de détermination de la vitesse ou de la trajectoire; Systèmes de détermination du sens d'un mouvement dans lesquels l'émetteur et le récepteur sont montés sur l'objet mobile, p.ex. pour déterminer la vitesse par rapport au sol, l'angle de dérive, le trajet au sol
G01S 13/02 - Systèmes utilisant la réflexion d'ondes radio, p.ex. systèmes du type radar primaire; Systèmes analogues
G01S 13/93 - Radar ou systèmes analogues, spécialement adaptés pour des applications spécifiques pour prévenir les collisions
A radar system includes transmitters and receivers configured for installation and use in a vehicle. The transmitters transmit radio signals. The receivers receive radio signals that include the transmitted radio signals reflected from objects in an environment. Each receiver has an RF front end, an analog-to-digital converter (ADC), a digital signal processor, and a controller. The digital signal processor processes the data from the ADC and stores data samples in a buffer. The buffer operates in several modes defined by the controller. These modes include replay mode, loopback mode, quiet mode and throttle mode. By controlling the buffer, the same received samples can be processed in multiple ways to generate information on targets at different ranges and velocities. The buffer is read out and the data is processed further to enable the radar system to determine range, velocity and angle of targets in the environment.
G01S 13/00 - Systèmes utilisant la réflexion ou la reradiation d'ondes radio, p.ex. systèmes radar; Systèmes analogues utilisant la réflexion ou la reradiation d'ondes dont la nature ou la longueur d'onde sont sans importance ou non spécifiées
12.
INCREASING PERFORMANCE OF A RECEIVE PIPELINE OF A RADAR WITH MEMORY OPTIMIZATION
A radar sensing system for a vehicle includes transmitters, receivers, a memory, and a processor. The transmitters transmit radio signals and the receivers receive reflected radio signals. The processor produces samples by correlating reflected radio signals with time-delayed replicas of transmitted radio signals. The processor stores this information as a first radar data cube (RDC), with information related to signals reflected from objects as a function of time (one of the dimensions) at various distances (a second dimension) for various receivers (a third dimension). The first RDC is processed to compute velocity and angle estimates, which are stored in a second RDC and a third RDC, respectively. One or more memory optimizations are used to increase performance. Before storing the second RDC and the third RDC in an internal/external memory, the second and third RDCs are sparsified to only include the outputs in specific regions of interest.
G01S 13/02 - Systèmes utilisant la réflexion d'ondes radio, p.ex. systèmes du type radar primaire; Systèmes analogues
B60T 8/32 - Dispositions pour adapter la force de freinage sur la roue aux conditions propres au véhicule ou à l'état du sol, p.ex. par limitation ou variation de la force de freinage selon une condition de vitesse, p.ex. accélération ou décélération
G01S 13/00 - Systèmes utilisant la réflexion ou la reradiation d'ondes radio, p.ex. systèmes radar; Systèmes analogues utilisant la réflexion ou la reradiation d'ondes dont la nature ou la longueur d'onde sont sans importance ou non spécifiées
G01S 13/06 - Systèmes déterminant les données relatives à la position d'une cible
G01S 13/18 - Systèmes pour mesurer la distance uniquement utilisant la transmission de trains discontinus d'ondes modulées par impulsions utilisant des fenêtres en distance
13.
PROGRAMMABLE CODE GENERATION FOR RADAR SENSING SYSTEMS
A radar sensing system for a vehicle has multiple transmitters and receivers on a vehicle. The transmitters are configured to transmit radio signals which are reflected off of objects in the environment. There are one or more receivers that receive the reflected radio signals. Each receiver has an antenna, a radio frequency front end, an analog-to- digital converter (ADC), and a digital signal processor. The transmitted signals are based on spreading codes generated by a programmable code generation unit. The receiver also makes use of the spreading codes generated by the programmable code generation unit. The programmable code generation unit is configured to selectively generate particular spreading codes that have desired properties.
G01S 13/32 - Systèmes pour mesurer la distance uniquement utilisant la transmission d'ondes continues, soit modulées en amplitude, en fréquence ou en phase, soit non modulées
G01S 13/02 - Systèmes utilisant la réflexion d'ondes radio, p.ex. systèmes du type radar primaire; Systèmes analogues
H02J 50/20 - Circuits ou systèmes pour l'alimentation ou la distribution sans fil d'énergie électrique utilisant des micro-ondes ou des ondes radio fréquence
A radar sensing system for a vehicle includes a plurality of transmitters, a plurality of receivers, and a plurality of receive and transmit antennas. The plurality of transmitters are configured for installation and use on a vehicle, and operable to transmit radio signals. The plurality of receivers are configured for installation and use on the vehicle, and operable to receive radio signals which include transmitted radio signals reflected from objects in the environment. The plurality of receive antennas and the plurality of transmit antennas are arranged in a selected MIMO configuration to provide a quantity of receive antennas and transmit antennas for a desired level of two- dimensional angle capability for a given board size.
A radar sensing system includes at least one transmitter, at least one receiver and a processor. The at least one transmitter transmits a power shaped RF signal. The transmitted RF signal decreases in power over time. The at least one receiver receives a reflected RF signal. The reflected RF signal is the transmitted RF signal reflected from targets in the environment. The reflected RF signal is down-converted and the result provided to the processor. The processor samples the down-converted reflected RF signal during a plurality of time intervals to produce a sampled stream. The different time intervals of the plurality of time intervals will contain different signal levels of RF signals reflected from the targets. The processor also selects samples in the sampled stream over a selected time interval of the plurality of time intervals that is free of RF signals reflected off of near targets.
G01S 7/35 - DÉTERMINATION DE LA DIRECTION PAR RADIO; RADIO-NAVIGATION; DÉTERMINATION DE LA DISTANCE OU DE LA VITESSE EN UTILISANT DES ONDES RADIO; LOCALISATION OU DÉTECTION DE LA PRÉSENCE EN UTILISANT LA RÉFLEXION OU LA RERADIATION D'ONDES RADIO; DISPOSITIONS ANALOGUES UTILISANT D'AUTRES ONDES - Détails des systèmes correspondant aux groupes , , de systèmes selon le groupe - Détails de systèmes non impulsionnels
G01S 13/18 - Systèmes pour mesurer la distance uniquement utilisant la transmission de trains discontinus d'ondes modulées par impulsions utilisant des fenêtres en distance
G01S 13/32 - Systèmes pour mesurer la distance uniquement utilisant la transmission d'ondes continues, soit modulées en amplitude, en fréquence ou en phase, soit non modulées
G01S 13/93 - Radar ou systèmes analogues, spécialement adaptés pour des applications spécifiques pour prévenir les collisions
16.
VEHICULAR RADAR SENSING SYSTEM UTILIZING HIGH RATE TRUE RANDOM NUMBER GENERATOR
A radar sensing system for a vehicle includes transmit and receive pipelines. The transmit pipeline includes transmitters able to transmit radio signals. The receive pipeline includes receivers able to receive signals. The received signals are transmitted signals that are reflected from an object. The transmit pipeline phase modulates the signals before transmission, as defined by a first binary sequence. The receive pipeline comprises an analog to digital converter (ADC) for sampling the received signals. The transmit pipeline includes a pseudorandom binary sequence (PRBS) generator for outputting a second binary sequence of bits with an equal probability of 1 and 0. The first binary sequence is defined by least significant bit (LSB) outputs from the ADC and the second binary sequence of bits. The first binary sequence comprises a truly random unbiased sequence of bits with an equal probability of 1 and 0.
G01S 1/68 - Marqueur, balise d'extrémité, indicatif d'appel ou toutes balises analogues transmettant des signaux ne portant pas d'information directionnelle
G01S 7/02 - DÉTERMINATION DE LA DIRECTION PAR RADIO; RADIO-NAVIGATION; DÉTERMINATION DE LA DISTANCE OU DE LA VITESSE EN UTILISANT DES ONDES RADIO; LOCALISATION OU DÉTECTION DE LA PRÉSENCE EN UTILISANT LA RÉFLEXION OU LA RERADIATION D'ONDES RADIO; DISPOSITIONS ANALOGUES UTILISANT D'AUTRES ONDES - Détails des systèmes correspondant aux groupes , , de systèmes selon le groupe
G01S 13/08 - Systèmes pour mesurer la distance uniquement
G01S 13/93 - Radar ou systèmes analogues, spécialement adaptés pour des applications spécifiques pour prévenir les collisions
G01S 17/02 - Systèmes utilisant la réflexion d'ondes électromagnétiques autres que les ondes radio
G01S 17/10 - Systèmes déterminant les données relatives à la position d'une cible pour mesurer la distance uniquement utilisant la transmission d'ondes à modulation d'impulsion interrompues
A radar sensing system for a vehicle includes a transmitter, a receiver, and a processor. The transmitter is configured to transmit a radio signal at a selected carrier frequency. The receiver is configured to receive a radio signal which includes a reflected radio signal that is the transmitted radio signal reflected from an object. The receiver also receives an interfering radio signal transmitted by a transmitter of another radar sensing system. The processor is configured to control the transmitter to transmit radio signals on the selected carrier frequency. The processor is further configured to at least one of (i) select a carrier frequency with reduced interference and (ii) mitigate interference from the other radar sensing system.
G01S 13/00 - Systèmes utilisant la réflexion ou la reradiation d'ondes radio, p.ex. systèmes radar; Systèmes analogues utilisant la réflexion ou la reradiation d'ondes dont la nature ou la longueur d'onde sont sans importance ou non spécifiées
G01S 13/02 - Systèmes utilisant la réflexion d'ondes radio, p.ex. systèmes du type radar primaire; Systèmes analogues
G01S 13/04 - Systèmes déterminant la présence d'une cible
G01S 13/88 - Radar ou systèmes analogues, spécialement adaptés pour des applications spécifiques
18.
DIGITAL FREQUENCY MODULATED CONTINUOUS WAVE RADAR USING HANDCRAFTED CONSTANT ENVELOPE MODULATION
A radar system for a vehicle includes a transmitter and a receiver. The transmitter transmits an amplified and frequency modulated radio signal. Each transmitter comprises a frequency generator, a code generator, a modulator, a constant-envelope power amplifier, and an antenna. The frequency generator generates the radio signal with a desired center frequency. The code generator generates a sequence of chips at a selected chiprate. A modulation interval between successive chips is a reciprocal of the chiprate. The modulator frequency modulates the radio signal using shaped frequency pulses. The shaped frequency pulses correspond to a first signal, the frequency of which deviates from the desired center frequency during each of the modulation intervals according to a selected pulse shape. The selected pulse shape is determined by the generated sequence of chips. The constant-envelope power amplifier amplifies the frequency modulated radio signal at a desired transmit power level. The antenna transmits the radio signal.
A radar sensing system for a vehicle includes a transmitter configured for installation and use on a vehicle and able to transmit radio signals. The radar sensing system also includes a receiver and a processor. The receiver is configured for installation and use on the vehicle and able to receive radio signals. The received radio signals include transmitted radio signals that are reflected from objects in the environment. The received radio signals further include radio signals transmitted by at least one other radar system. The processor samples the received radio signals to produce a sampled stream. The processor is configured to control an adaptive filter. Responsive to the processor, the adaptive filter is configured to filter the sampled stream, such that the radio signals transmitted by the at least one other radar system are removed from the received radio signals.
B60Q 9/00 - Agencement ou adaptation des dispositifs de signalisation non prévus dans l'un des groupes principaux
B60T 8/32 - Dispositions pour adapter la force de freinage sur la roue aux conditions propres au véhicule ou à l'état du sol, p.ex. par limitation ou variation de la force de freinage selon une condition de vitesse, p.ex. accélération ou décélération
G01S 13/93 - Radar ou systèmes analogues, spécialement adaptés pour des applications spécifiques pour prévenir les collisions
A shared radar and communication system for a vehicle includes capabilities for radar detection and communication with vehicles equipped with similar systems. The radar system is equipped with pluralities of transmit antennas and pluralities of receive antennas. The radar transmits a signal modulated with spread codes that are information bits. A receiver discriminates the signals sent from own transmitters and multiple reflections to detect objects of interest. In addition, the receiver discriminates signals transmitted from different systems on other vehicles. This requires the receiving system to have knowledge of the codes transmitted by the other vehicle. The receiving system determines the information bits sent by the other vehicle. If multiple radar systems on multiple vehicles use different sets of codes (but known to each other), the multiple systems can create a communication infra-structure in addition to radar detection and imaging.
G01S 3/02 - Radiogoniomètres pour déterminer la direction d'où proviennent des ondes infrasonores, sonores, ultrasonores ou électromagnétiques ou des émissions de particules sans caractéristiques de direction utilisant des ondes radio
21.
VEHICLE RADAR SYSTEM USING SHAPED ANTENNA PATTERNS
A radar sensing system for a vehicle, the radar sensing system including a transmitter and a receiver. The transmitter is configured to transmit a radio signal. The receiver is configured to receive the transmitted radio signal reflected from objects in the environment. The transmitter includes an antenna and is configured to transmit the radio signal via the antenna. The antenna includes a plurality of linear arrays of patch radiators. An arrangement of the linear arrays of patch radiators is selected to form a desired shaped antenna pattern having a desired mainlobe shape and desired shoulder shapes to cover selected sensing zones without nulls or holes in the coverage.
G01S 13/02 - Systèmes utilisant la réflexion d'ondes radio, p.ex. systèmes du type radar primaire; Systèmes analogues
G01S 13/72 - Systèmes radar de poursuite; Systèmes analogues pour la poursuite en deux dimensions, p.ex. combinaison de la poursuite en angle et de celle en distance, radar de poursuite pendant l'exploration
A radar sensing system for a vehicle includes a transmitter, a receiver, a memory, and a processor. The transmitter transmits a radio signal and the receiver receives a reflected radio signal. The processor samples reflected radio signals during a plurality of time slices. The processor produces samples by correlating reflected radio signals to time- delayed replicas of transmitted radio signals. The processor accumulates the time slices into a first radar data cube and stores the first radar data cube in a memory. The processor combines a portion of the first radar data cube with a portion of a previously stored radar data cube. Based at least in part on the combined portions of the radar data cubes, the processor processes a time series that is a time series of the first radar data cube concatenated with a time series from the previously stored radar data cube.
G01S 13/02 - Systèmes utilisant la réflexion d'ondes radio, p.ex. systèmes du type radar primaire; Systèmes analogues
G01S 3/02 - Radiogoniomètres pour déterminer la direction d'où proviennent des ondes infrasonores, sonores, ultrasonores ou électromagnétiques ou des émissions de particules sans caractéristiques de direction utilisant des ondes radio
G01S 3/06 - Moyens pour accroître la directivité effective, p.ex. en combinant des signaux ayant des caractéristiques de directivité différemment orientées ou en affinant la forme d'onde enveloppe du signal provenant d'une antenne directionnelle rotative ou osci
G01S 5/02 - Localisation par coordination de plusieurs déterminations de direction ou de ligne de position; Localisation par coordination de plusieurs déterminations de distance utilisant les ondes radioélectriques
G01S 15/60 - Systèmes de détermination de la trajectoire ou de la vitesse; Systèmes de détermination du sens d'un mouvement dans lesquels l'émetteur et le récepteur sont montés sur l'objet mobile, p.ex. pour déterminer la vitesse par rapport au sol, l'angle de dérive, le trajet au sol
A radar sensing system for a vehicle includes a transmitter, a receiver, and an interference mitigation processor. The transmitter transmits radio signals. The receiver receives radio signals. The received radio signals include reflected radio signals that are each transmitted radio signals reflected from objects in the environment. The receiver also down-converts and digitizes the received radio signals to produce a baseband sampled stream. The interference mitigation processor produces a second received radio signal that includes reflected radio signals that are transmitted radio signals reflected from a first object. The interference mitigation processor uses the second received radio signal to remove selected samples from the baseband sampled stream that are attributed to radio signals reflected from the first object to produce a modified baseband sampled stream. The receiver uses the modified baseband sampled stream to detect a second object more distant than the first object.
A radar system has different modes of operation. In one mode, the radar operates as a single-input, multiple output (SIMO) radar system utilizing one transmitted signal from one antenna at a time. Codes with known excellent autocorrelation properties are utilized in this mode. At each receiver the response after correlating with various possible transmitted signals is measured in order to estimate the interference that each transmitter will represent at each receiver. The estimated effect of the interference from one transmitter to a receiver that correlates with a different code is used to mitigate the interference. In another mode, the radar operates as a multi-input, multiple-output (MIMO) radar system utilizing all the antennas at a time. Interference cancellation of the nonideal cross-correlation sidelobes when transmitting in the MIMO mode are employed to remove ghost targets due to unwanted sidelobes.
G01S 7/02 - DÉTERMINATION DE LA DIRECTION PAR RADIO; RADIO-NAVIGATION; DÉTERMINATION DE LA DISTANCE OU DE LA VITESSE EN UTILISANT DES ONDES RADIO; LOCALISATION OU DÉTECTION DE LA PRÉSENCE EN UTILISANT LA RÉFLEXION OU LA RERADIATION D'ONDES RADIO; DISPOSITIONS ANALOGUES UTILISANT D'AUTRES ONDES - Détails des systèmes correspondant aux groupes , , de systèmes selon le groupe
A radar system processes signals in a flexible, adaptive manner to determine range, Doppler (velocity) and angle of objects in an environment. The radar system processes the received signal to achieve different objectives depending on the environment, the current information stored in the radar system, and/or external information provided to the radar system. The system allows improved resolution of range, Doppler and/or angle depending on the desired objective.
G01S 13/02 - Systèmes utilisant la réflexion d'ondes radio, p.ex. systèmes du type radar primaire; Systèmes analogues
G01S 13/00 - Systèmes utilisant la réflexion ou la reradiation d'ondes radio, p.ex. systèmes radar; Systèmes analogues utilisant la réflexion ou la reradiation d'ondes dont la nature ou la longueur d'onde sont sans importance ou non spécifiées
G01S 13/42 - Mesure simultanée de la distance et d'autres coordonnées
26.
VEHICULAR RADAR SYSTEM WITH SELF-INTERFERENCE CANCELLATION
A digital FMCW radar is described that simultaneously transmits and receives digitally frequency modulated signals using multiple transmitters and multiple receivers and associated antennas. Several sources of nearby spillover from transmitters to receivers that would otherwise degrade receiver performance are subtracted by a cancellation system in the analog radio frequency domain that adaptively synthesizes an analog subtraction signal based on residual spillover measured by a correlator operating in the receivers' digital signal processing domains and based on knowledge of the transmitted waveforms. The first adaptive cancellation system achieves a sufficient reduction of transmit-receive spillover to avoid receiver saturation or other non-linear effects, but is then added back in to the signal path in the digital domain after analog-to-digital conversion so that spillover cancellation can also operate in the digital signal processing domain to remove deleterious spillover components.
H02J 50/20 - Circuits ou systèmes pour l'alimentation ou la distribution sans fil d'énergie électrique utilisant des micro-ondes ou des ondes radio fréquence
G01S 13/88 - Radar ou systèmes analogues, spécialement adaptés pour des applications spécifiques
H02J 50/27 - Circuits ou systèmes pour l'alimentation ou la distribution sans fil d'énergie électrique utilisant des micro-ondes ou des ondes radio fréquence caractérisés par le type d'antennes de réception, p.ex. les antennes redresseuses
A radar system has different modes of operation. In one mode the radar operates as a single-input, multiple-output (SIMO) radar system utilizing one transmitted signal from one antenna at a time. Codes with known excellent autocorrelation properties are utilized in this mode. At each receiver the response after correlating with various possible transmitted signals is measured in order to estimate the interference that each transmitter will represent at each receiver. The estimated effect of the interference from one transmitter on a receiver that correlates with a different code is used to mitigate the interference. In another mode, the radar operates as a MIMO radar system utilizing all the antennas at a time. Interference cancellation of the non-ideal cross correlation sidelobes when transmitting in the MIMO mode are employed to remove ghost targets due to unwanted sidelobes.
H04B 7/00 - Systèmes de transmission radio, c. à d. utilisant un champ de rayonnement
H04B 7/02 - Systèmes de diversité; Systèmes à plusieurs antennes, c. à d. émission ou réception utilisant plusieurs antennes
H04B 7/04 - Systèmes de diversité; Systèmes à plusieurs antennes, c. à d. émission ou réception utilisant plusieurs antennes utilisant plusieurs antennes indépendantes espacées
H04H 20/00 - Dispositions de radiodiffusion ou de distribution couplées à la radiodiffusion
H04H 20/65 - Dispositions caractérisées par des systèmes de transmission pour la radiodiffusion
brevets
