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.

A method for close-range detection, includes transmitting, via a radar transceiver, radar signals to detect an object. The method also includes determining whether the object includes a pattern code based on reflections of the radar signals received by the radar transceiver. In response to determining that the object includes the pattern code, the method includes identifying range information about a range between the electronic device and the pattern code. The method further includes selecting, based on the range information, one or more signals from the reflections of the radar signals that are reflected off of the pattern code. Additionally, the method includes identifying, based on the one or more signals, information about the pattern code.

A signal cutting-out unit cuts out a signal reflected from a target by a specific length while the cut-out signals are overlapped by a set length. A power spectrum calculating unit calculates a plurality of power spectra from output signals from the signal cutting-out unit. A power spectrum reconstructing unit performs power spectrum reconstruction by changing a ratio or contribution rate of power spectrum components in a set region, using the plurality of power spectra. A spectral moment calculating unit calculates a spectral moment from a power spectrum reconstructed by the power spectrum reconstructing unit.

A signal cutting-out unit cuts out a signal reflected from a target by a specific length while the cut-out signals are overlapped by a set length. A power spectrum calculating unit calculates a plurality of power spectra from output signals from the signal cutting-out unit. A power spectrum reconstructing unit performs power spectrum reconstruction by changing a ratio or contribution rate of power spectrum components in a set region, using the plurality of power spectra. A spectral moment calculating unit calculates a spectral moment from a power spectrum reconstructed by the power spectrum reconstructing unit.

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.

The echoes being picked up in the distance-speed domain, the method being wherein it includes a step of producing a mask, in the distance-speed plane, overlying the zone of detection of the ground and/or sea clutter echoes picked up by the sidelobes, the zone being determinable by the antenna parameters of the radar, the waveform emitted by the radar and the environmental context of the radar, all the points of the distance-speed plane which are covered by the mask being assigned a characteristic which is specific to the mask; a step of filtering the received echoes, in which the echoes covered by the mask are rejected from the radar reception processing.

The echoes being picked up in the distance-speed domain, the method being wherein it includes a step of producing a mask, in the distance-speed plane, overlying the zone of detection of the ground and/or sea clutter echoes picked up by the sidelobes, the zone being determinable by the antenna parameters of the radar, the waveform emitted by the radar and the environmental context of the radar, all the points of the distance-speed plane which are covered by the mask being assigned a characteristic which is specific to the mask; a step of filtering the received echoes, in which the echoes covered by the mask are rejected from the radar reception processing.

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.