Method for providing reduced interference for at least two co-located FMCW (Frequency Modulated Continuous Wave) Doppler radars, each of said radars being used in a system to detect respective distances to and velocities of objects moving through space, can include a propagation determination step, in which expected electromagnetic wave propagation times are determined between pairs of radars; a sweep time offset synchronizing step, in which different respective sweep time offsets are selected, with respect to each radar in a first group of radars; and a sweep frequency offset synchronizing step, in which a second sweep frequency offset is selected with respect to a second group of radars, the second sweep frequency offset being relative to a sweep frequency pattern used for radars belonging to said first group. The invention also relates to a system and to a computer software product.

Techniques described here introduce signature frequency modulation to unmodulated pulse signals as frequency chirps to enhance the security of multi-carrier phase-based ranging signals. The characteristics of the chirps may be mutually known by an initiator and a desired reflector of the ranging applications. The characteristics of the chirps may vary between the multi-carrier signals to thwart any attempt by an eavesdropper to predict the chirps. In one aspect, the characteristics of the chirps may be calculated for each timeslot of a ranging cycle by two authorized devices using a ciphering algorithm such as the Advanced Encryption Standard (AES) based on a shared security key. Each call of the AES may generate one or more pseudo-random numbers based on the shared security key and a time-varying initialization vector that increments every timeslot. Fields of the pseudo-random number may be extracted to determine the characteristics of the chirps associated with the timeslot.

An electronic device may include radar circuitry. Control circuitry may calibrate the radar circuitry using a multi-tone calibration signal. A first mixer may upconvert the calibration signal for transmission by a transmit antenna. A de-chirp mixer may mix the calibration signal output by the first mixer with the calibration signal as received by a receive antenna or loopback path to produce a baseband multi-tone calibration signal. The baseband signal will be offset from DC by the frequency gap. This may prevent DC noise or other system effects from interfering with the calibration signal. The control circuitry may sweep the first mixer over the radio frequencies of operation of the radar circuitry to estimate the power droop and phase shift of the radar circuitry based on baseband calibration signal. Distortion circuitry may distort transmit signals used in spatial ranging operations to invert the estimated power droop and phase shift.

Examples disclosed herein relate to a radiating structure. The radiating structure has a transmission array structure having a plurality of transmission paths with each transmission path having a plurality of slots and a pair of adjacent transmission paths forming a superelement. Each superelement has a phase control module to control a phase of a transmission signal. The radiating structure also includes a radiating array structure having a plurality of radiating elements configured in a lattice, with each radiating element corresponding to at least one slot from the plurality of slots and the radiating array structure positioned proximate the transmission array structure. A feed coupling structure is coupled to the transmission array structure and adapted for propagation of a transmission signal to the transmission array structure. The transmission signal is radiated through at least one superelement and at least one of the plurality of radiating elements and has a phase controlled by the phase control module in the at least one superelement.

A radar sensor includes: a transceiver unit for emitting a radar beam at at least two different wavelengths along a beam path in an outgoing direction and to receive radar radiation along the beam path in an incoming direction; and a reference object placed in the beam path for redirecting part of the outgoing radar beam in the incoming direction. The reference object includes two identical grids, each grid having regularly spaced elements arranged at a distance d from each other in a first direction perpendicular to the beam path, the grids being spaced from one another along the beam path by a distance L. The transceiver unit is operable at a wavelength λ which satisfies $L=n\frac{2d}{{\lambda }^2}$
n being an integer.

A system for detecting objects in an environment, comprising a measuring system and a processing unit in signal communication with the measuring system, wherein: the measuring system comprises macro-components formed of respective subcomponents, wherein the macro-components comprise: a waveform generator configured to provide an electrical signal to be transmitted with a predetermined waveform, transmitting and receiving means configured to transmit a first electromagnetic signal matching the electrical signal to be transmitted and to receive from the environment a second electromagnetic signal generated by a reflection of the first electromagnetic signal, thereby providing a received signal matching the second electromagnetic signal, an analog conditioning circuit configured to provide a baseband electrical signal by baseband converting the received signal, and an analog-to-digital converter configured to provide a digital signal which is a discrete sequence of values obtained by sampling the baseband electrical signal in plural time instants.

Automotive radar methods and systems for enhancing resistance to interference using a built-in self-test (BIST) module. In one illustrative embodiment, an automotive radar transceiver includes: a signal generator that generates a transmit signal; a modulator that derives a modulated signal from the transmit signal using at least one of phase and amplitude modulation; at least one receiver that mixes the transmit signal with a receive signal to produce a down-converted signal, the receive signal including the modulated signal during a built-in self-test (BIST) mode of operation; and at least one transmitter that drives a radar antenna with a selectable one of the transmit signal and the modulated signal.

A radar distance measuring device having a BPF type ΣΔADC and capable of controlling a band of a BBF and modulation setting of a chirp signal in conjunction therewith is provided. A chirp signal generated by a synthesizer is distributed to a transmission antenna and each of mixers at a reception side. The chirp signal is amplified and irradiated from the transmission antenna to an object as radar. The radar reflected by the objects received by reception antennas, and is then mixed with the chirp signal from the synthesizer by the mixers to generate IF signals. These IF signals are respectively outputted to ADCs via anti-aliasing filters. Each of the ADCs is as oversampling ΣΔADC. The IF signals are sampled by the ΣΔADC, and are converted into a digital signal.

Methods and systems for generating and utilizing an emulated radar data cube are disclosed. An emulated radar transmission waveform is defined based on expected radar performance. A virtual real world scenario comprising one or more virtual target objects is constructed. The virtual target objects emulate reflection and scattering properties to an input radar wave of real world objects. Operations of radar transmit and receive channels including an antenna array and free space propagation are emulated to obtain emulated raw radar data. Data processing is performed on the emulated raw radar data to build an emulated radar data cube. The emulated radar data cube is utilized to test a radar perception algorithm.

In an embodiment, a method for testing a millimeter-wave radar module includes: providing power to the millimeter-wave radar module; performing a plurality of tests indicative of a performance level of the millimeter-wave radar module; comparing respective results from the plurality of tests with corresponding test limits; and generating a flag when a result from a test of the plurality of test is outside the corresponding test limits, where performing the plurality of tests includes: transmitting a signal with a transmitting antenna coupled to a millimeter-wave radar sensor, modulating the transmitted signal with a test signal, and capturing first data from a first receiving antenna using an analog-to-digital converter of the millimeter-wave radar sensor, where generating the flag includes generating the flag based on the captured first data.