A method for estimating the height of a reflector of a vehicle, the method including a reading step, in which at least one reflection signal from the reflector of the vehicle is read at one time and the at least one reflection signal representing at least one information item in respect of a relative speed of the vehicle. Further, the method includes a specifying step, in which an estimated value for the speed of the vehicle is specified. Finally, the method includes an ascertaining step, in which an estimated value for the height of the reflector is ascertained using the relative speed of the vehicle and the estimated value for the speed of the vehicle.

A method for estimating the height of a reflector of a vehicle, the method including a reading step, in which at least one reflection signal from the reflector of the vehicle is read at one time and the at least one reflection signal representing at least one information item in respect of a relative speed of the vehicle. Further, the method includes a specifying step, in which an estimated value for the speed of the vehicle is specified. Finally, the method includes an ascertaining step, in which an estimated value for the height of the reflector is ascertained using the relative speed of the vehicle and the estimated value for the speed of the vehicle.

Methods and systems for estimating vehicle velocity based on radar data. The methods and systems include receiving a set of range-Doppler-beam, RDB, maps from radars located on a vehicle and performing an optimization process that adjusts an estimate of vehicle velocity so as to optimize a correlation score. The optimization process includes iteratively: spatially registering the set of RDB maps based on the current estimate of vehicle velocity, determining the correlation score based on the spatially registered set of RDB maps, and outputting an optimized estimate of vehicle velocity from the optimization process when the correlation score has been optimized. The methods and systems control the vehicle based at least in part on the optimized estimate of vehicle velocity.

Methods and systems for estimating vehicle velocity based on radar data. The methods and systems include receiving a set of range-Doppler-beam, RDB, maps from radars located on a vehicle and performing an optimization process that adjusts an estimate of vehicle velocity so as to optimize a correlation score. The optimization process includes iteratively: spatially registering the set of RDB maps based on the current estimate of vehicle velocity, determining the correlation score based on the spatially registered set of RDB maps, and outputting an optimized estimate of vehicle velocity from the optimization process when the correlation score has been optimized. The methods and systems control the vehicle based at least in part on the optimized estimate of vehicle velocity.

In accordance with described examples, a method determines if a velocity of an object detected by a radar is greater than a maximum velocity by receiving on a plurality of receivers at least one frame of chirps transmitted by at least two transmitters and reflected off of the object. A velocity induced phase shift (φ.sub.d) in a virtual array vector S of signals received by each receiver corresponding to a sequence of chirps (frame) transmitted by each transmitter is estimated. Phases of each element of virtual array vector S are corrected using φ.sub.d to generate a corrected virtual array vector S.sub.c. A first Fourier transform is performed on the corrected virtual array vector S.sub.c to generate a corrected virtual array spectrum to detect a signature that indicates that the object has an absolute velocity greater than a maximum velocity.

In accordance with described examples, a method determines if a velocity of an object detected by a radar is greater than a maximum velocity by receiving on a plurality of receivers at least one frame of chirps transmitted by at least two transmitters and reflected off of the object. A velocity induced phase shift (φ.sub.d) in a virtual array vector S of signals received by each receiver corresponding to a sequence of chirps (frame) transmitted by each transmitter is estimated. Phases of each element of virtual array vector S are corrected using φ.sub.d to generate a corrected virtual array vector S.sub.c. A first Fourier transform is performed on the corrected virtual array vector S.sub.c to generate a corrected virtual array spectrum to detect a signature that indicates that the object has an absolute velocity greater than a maximum velocity.

A multistatic radar system is provided for detecting and tracking targets moving in a surveillance area that includes: a radar transmitter and a plurality of radar receivers located in different positions in the surveillance area and processing means. The radar transmitter and the radar receivers each include a GNSS receiver configured to receive GNSS signals. The radar transmitter and the radar receivers are configured to obtain a GNSS-based time reference based on the GNSS signals received by the respective GNSS receiver, wherein the GNSS-based time reference is common to the radar transmitter and the radar receivers. The radar transmitter is configured to transmit radar signals according to a predefined transmission time and frequency pattern and on the basis of the GNSS-based time reference. The radar receivers are configured to receive radar echoes from one or more targets moving in the surveillance area and illuminated by the radar signals transmitted by the radar transmitter. Each radar receiver is configured to determine, for each radar echo received by the radar receiver from a respective target, a corresponding distance-related information item based on the predefined transmission time and frequency pattern, the GNSS-based time reference and a respective reception time of the radar echo, wherein the corresponding distance-related information item is related to an overall distance from the radar transmitter to the respective target and from the respective target to the radar receiver, and a corresponding Doppler frequency of the radar echo based on the predefined transmission time and frequency pattern and the GNSS-based time reference, and to provide the processing means with data indicative of the distance-related information items and the Doppler frequencies determined by the radar receiver, and reference times associated with the distance-related information items and the Doppler frequencies, wherein the reference times are referenced to the GNSS-based time reference.

A multistatic radar system is provided for detecting and tracking targets moving in a surveillance area that includes: a radar transmitter and a plurality of radar receivers located in different positions in the surveillance area and processing means. The radar transmitter and the radar receivers each include a GNSS receiver configured to receive GNSS signals. The radar transmitter and the radar receivers are configured to obtain a GNSS-based time reference based on the GNSS signals received by the respective GNSS receiver, wherein the GNSS-based time reference is common to the radar transmitter and the radar receivers. The radar transmitter is configured to transmit radar signals according to a predefined transmission time and frequency pattern and on the basis of the GNSS-based time reference. The radar receivers are configured to receive radar echoes from one or more targets moving in the surveillance area and illuminated by the radar signals transmitted by the radar transmitter. Each radar receiver is configured to determine, for each radar echo received by the radar receiver from a respective target, a corresponding distance-related information item based on the predefined transmission time and frequency pattern, the GNSS-based time reference and a respective reception time of the radar echo, wherein the corresponding distance-related information item is related to an overall distance from the radar transmitter to the respective target and from the respective target to the radar receiver, and a corresponding Doppler frequency of the radar echo based on the predefined transmission time and frequency pattern and the GNSS-based time reference, and to provide the processing means with data indicative of the distance-related information items and the Doppler frequencies determined by the radar receiver, and reference times associated with the distance-related information items and the Doppler frequencies, wherein the reference times are referenced to the GNSS-based time reference.

In accordance with described examples, a method determines if a velocity of an object detected by a radar is greater than a maximum velocity by receiving on a plurality of receivers at least one frame of chirps transmitted by at least two transmitters and reflected off of the object. A velocity induced phase shift (φ.sub.d) in a virtual array vector S of signals received by each receiver corresponding to a sequence of chirps (frame) transmitted by each transmitter is estimated. Phases of each element of virtual array vector S are corrected using φ.sub.d to generate a corrected virtual array vector S.sub.c. A first Fourier transform is performed on the corrected virtual array vector S.sub.c to generate a corrected virtual array spectrum to detect a signature that indicates that the object has an absolute velocity greater than a maximum velocity.

In accordance with described examples, a method determines if a velocity of an object detected by a radar is greater than a maximum velocity by receiving on a plurality of receivers at least one frame of chirps transmitted by at least two transmitters and reflected off of the object. A velocity induced phase shift (φ.sub.d) in a virtual array vector S of signals received by each receiver corresponding to a sequence of chirps (frame) transmitted by each transmitter is estimated. Phases of each element of virtual array vector S are corrected using φ.sub.d to generate a corrected virtual array vector S.sub.c. A first Fourier transform is performed on the corrected virtual array vector S.sub.c to generate a corrected virtual array spectrum to detect a signature that indicates that the object has an absolute velocity greater than a maximum velocity.