Techniques for automatic adaptive scanning with a laser scanner include obtaining range measurements at a coarse angular resolution and forming a horizontally sorted range gate subset and a characteristic range. A fine angular resolution is determined automatically based on the characteristic range and a target spatial resolution. If the fine angular resolution is finer than the coarse angular resolution, then a minimum and maximum vertical angle is automatically determined in each horizontal slice extending a bin size from any previous horizontal slice. A set of adaptive minimum and maximum vertical angles is determined automatically by dilating and interpolating the minimum and maximum vertical angles of all the slices to the second horizontal angular resolution. A horizontal start angle, and the set of adaptive minimum and maximum vertical angles are sent to cause the ranging system to obtain measurements at the second angular resolution.

Techniques for automatic adaptive scanning with a laser scanner include obtaining range measurements at a coarse angular resolution and forming a horizontally sorted range gate subset and a characteristic range. A fine angular resolution is determined automatically based on the characteristic range and a target spatial resolution. If the fine angular resolution is finer than the coarse angular resolution, then a minimum and maximum vertical angle is automatically determined in each horizontal slice extending a bin size from any previous horizontal slice. A set of adaptive minimum and maximum vertical angles is determined automatically by dilating and interpolating the minimum and maximum vertical angles of all the slices to the second horizontal angular resolution. A horizontal start angle, and the set of adaptive minimum and maximum vertical angles are sent to cause the ranging system to obtain measurements at the second angular resolution.

A receiver unit is disclosed for use in a multiple-input-multiple output, MIMO, radar system having a plurality of transmitters each for transmitting one of a group of orthogonal digital-transmitter-signals on a carrier wave, the receiver unit configured and adapted to receive a raw-analog-signal on a carrier wave reflected from one or more target objects. The receiver unit comprises: a down-converter configured to extract the raw-analog-signal from the carrier wave; an analog-to-digital converter configured to derive a raw-digital-signal from the raw-analog-signal; a plurality of filter units, each filter unit associated with a different one of the digital-transmitter-signals, operable on the raw-digital-signal and configured to identify reflection-event sequences in the raw-digital-signal; and a time-frequency transform sub-unit; wherein each filter unit comprises a mismatch filter having predetermined filter coefficients and designed to reduce the magnitude of side-lobes associated with a reflection-event sequence in the raw-digital-signal. Associated systems and methods are also disclosed.

A receiver unit is disclosed for use in a multiple-input-multiple output, MIMO, radar system having a plurality of transmitters each for transmitting one of a group of orthogonal digital-transmitter-signals on a carrier wave, the receiver unit configured and adapted to receive a raw-analog-signal on a carrier wave reflected from one or more target objects. The receiver unit comprises: a down-converter configured to extract the raw-analog-signal from the carrier wave; an analog-to-digital converter configured to derive a raw-digital-signal from the raw-analog-signal; a plurality of filter units, each filter unit associated with a different one of the digital-transmitter-signals, operable on the raw-digital-signal and configured to identify reflection-event sequences in the raw-digital-signal; and a time-frequency transform sub-unit; wherein each filter unit comprises a mismatch filter having predetermined filter coefficients and designed to reduce the magnitude of side-lobes associated with a reflection-event sequence in the raw-digital-signal. Associated systems and methods are also disclosed.

The present disclosure provides a method for conformal array pattern synthesis based on a solution space pruning particle swarm optimization algorithm (PSO), the method comprises taking a suppression index of a peak side lobe level (SLL) as a first index, obtaining the first array element excitation satisfying the first index under the constraint of the dynamic range ratio (DRR) of the array element excitation amplitude through iterations; obtaining a second array element excitation satisfying the multiple optimization objectives under the constraint of the DRR of the array element excitation amplitude by a solution algorithm according to the first array element excitation.

The present disclosure provides a method for conformal array pattern synthesis based on a solution space pruning particle swarm optimization algorithm (PSO), the method comprises taking a suppression index of a peak side lobe level (SLL) as a first index, obtaining the first array element excitation satisfying the first index under the constraint of the dynamic range ratio (DRR) of the array element excitation amplitude through iterations; obtaining a second array element excitation satisfying the multiple optimization objectives under the constraint of the DRR of the array element excitation amplitude by a solution algorithm according to the first array element excitation.

A vehicle, radar system of a vehicle and method of extending a range of the radar system. The radar system includes a transmitter antenna, a receiver antenna and a processor. The transmitter antenna transmits a reference signal. The receiver antenna receives an echo signal in response to reflection of the reference signal from an object located at a distance outside of the range limit of the radar system, wherein the range limit indicating a frequency sampling range. The processor generates a frequency peak for the object from the received echo signal, wherein the frequency peak lies outside of the frequency sampling range, shifts the frequency peak to within the frequency sampling range, and determines a range of the object using the frequency-shifted peak.

A vehicle, radar system of a vehicle and method of extending a range of the radar system. The radar system includes a transmitter antenna, a receiver antenna and a processor. The transmitter antenna transmits a reference signal. The receiver antenna receives an echo signal in response to reflection of the reference signal from an object located at a distance outside of the range limit of the radar system, wherein the range limit indicating a frequency sampling range. The processor generates a frequency peak for the object from the received echo signal, wherein the frequency peak lies outside of the frequency sampling range, shifts the frequency peak to within the frequency sampling range, and determines a range of the object using the frequency-shifted peak.

Methods, devices and computer readable storage medium for ranging between a tag device (410) and plurality of anchor devices (405). The tag device (410) broadcasts a first poll message (605) to a plurality of anchor devices (405). The tag device (410) receives a plurality of response messages (620) for the first poll message (605) from the plurality of anchor devices (405). The plurality of response messages (620) are transmitted by the plurality of anchor devices (405) at a plurality of response time points. The plurality of response time points are associated with ranks of respective distances among a plurality of distances between the tag device (410) and the plurality of anchor devices (405). After receiving the plurality of response messages, the tag device (410) broadcasts a second poll message to the plurality of anchor devices (405). The ranging efficiency may be improved.

A Doppler radar system comprises a transceiver configured to concurrently transmit a first set of RF signals, having a first set of frequencies, towards target(s) in motion and a second set of RF signals, having a second set of frequencies, towards stationary reflector(s), concurrently receive a first set of reflected signals from the target(s) and a second set of reflected signals from the reflector(s), the first set of reflected signals modulated by motion of the target(s) and of a moving radar platform and the second set of reflected signals modulated by motion of the platform. The first and second sets of reflected signals are down-converted to generate a first and a second set of down-converted signals, which are demodulated to generate a first and a second set of demodulated signals, which are processed to obtain a third set of signals free of artifacts resulting from motion of the radar platform.