In a method for operating a radar sensor, the unambiguousness range of the radar sensor is increased with respect to the range and/or the relative velocity by: transmitting multiple ramp sets by the radar sensor, the frequency ramps of the individual ramp sets each differing in one system parameter; adapting the sampling frequency during the detection of the radar echoes in such a way that a constant number of samples always results for each frequency ramp; and, to evaluate the radar signals, the spectra are periodically continued and compared to each other.

According to the invention, a device and a method are provided for determining the position of an object, in particular a moving object, in the three-dimensional space. The device comprises at least two switchable transmitting antennas having a different vertical position of the phase center as well as a plurality of receiving antennas which are arranged in series. The transmitting antennas are arranged in the horizontal direction and at a distance that corresponds to the distance of the receiving antennas. The transmitting antennas are vertically offset with respect to each other by a value that is less than or equal to half the free-space wavelength of the transmitted signal. The transmitting antennas can otherwise be arranged at any position around the receiving antenna. Horizontal beam sweep across a wide angular range is carried out according to the method of “digital beamforming”. The measurement of the vertical object position is carried out by phase measurement between the antenna beams when the transmitting antennas are sequentially switched.

A pre-warning method utilized in a vehicle radar system is disclosed. The vehicle radar system includes a frequency-modulation continuous wave (FMCW) module, a data transceiver module and an antenna module, and the FMCW module and the data transceiver module share the antenna module. The pre-warning method includes the FMCW module utilizing the antenna to transmit and receive beat signals to detect dynamic information of a target corresponding to the vehicle radar system and obtain a first detection result, and receiving and broadcasting data to broadcast the first detection result via the data transceiver module and the antenna module, or receive a detection result broadcasted by another vehicle radar system and combine the detection result with the first detection result to perform real-time target tracking and alarm.

A signal generating circuit includes a control voltage setting unit (CVSU) configured to set a control voltage for a chirp signal using voltage-frequency characteristics indicating characteristics of an output frequency versus voltage; a VCO configured to alter the frequency of its output signal by the control voltage; a quadrature demodulator configured to perform quadrature demodulation of the output signal of the VCO to generate an inphase signal and a quadrature signal orthogonal to each other; and a frequency detector configured to detect the frequency of the output signal of the VCO on the basis of the inphase signal and quadrature signal. The CVSU corrects the control voltage by using the voltage-frequency characteristics derived from relationships between the control voltage and the frequency of the output signal of the VCO. The VCO generates the chirp signal based on the control voltage corrected by the CVSU.

An object detection system in a surrounding environment of a vehicle. The detection system comprising, a radar, and a processing unit. The radar comprising a transmitter, a receiver, and an ultra-low phase-noise frequency synthesizer. The detection system gathers electromagnetic data of the objects from radio signal received by the receiver; classify each of the objects by analyzing the gathered electromagnetic data; continuously compare classifications and object detections to immediate past classifications and object detections, and to previously classified and detected objects; continuously validate current, immediate past, and past object detections; generate a three-dimensional electromagnetic-map of the surrounding environment by utilizing the electromagnetic signatures of each of the classified objects; and reclassify objects and combine the generated three-dimensional electromagnetic map with one of a geographical-map, a physical map, or a combination thereof to determine a direction and a distance of each of the one or more classified objects from the system.

Disclosed herein are a method and device for sensing a surrounding environment based on a frequency modulated continuous wave (FMCW) radar. The method for detecting a target based on an FMCW radar includes the steps of: the FMCW radar transmitting a sensing signal for detection of the target, and receiving a response signal in response to the sensing signal; the FMCW radar performing a signal processing on the response signal, and generating a frequency spectrum of a beat signal; the FMCW radar determining a detection frequency band for detection of the target within a valid frequency band of the frequency spectrum; the FMCW radar determining a threshold value to determine a target detection peak value for detection of the target among peak values of the frequency spectrum; and the FMCW radar detecting the target based on the detection frequency band and the threshold value.

The present invention relates to a method for determining distance (R) and radial velocity (v) of an object in relation to a measurement location, in which method radar signals are emitted and after reflection on the object are received again at the measurement location, wherein the emitted radar signals are subdivided within a measuring cycle into numerous segments (10) in which the frequency of the radar signals is gradually changed from an initial value (f.sub.A, f.sub.B) to the end value and each received reflected signal is subjected across one segment (10) to a first evaluation to detect frequency peaks and additionally a subsequent second evaluation of the signals for the frequency peaks of all segments (10) of the measuring cycle is carried out to determine a Doppler frequency component as a measure of the radial velocity (v). According to said method, an ambiguity in the determination of the relative velocity (v) is eliminated by subdividing the segments (10) into at least two groups (A, B), the initial value (f.sub.A, f.sub.B) of which and/or end value of the changing frequency are different, by subjecting the segments (11, 12) of each group (A, B) separately to the second evaluation and by determining a phase difference of the signals occurring during the second evaluation of the segments (11, 12) of each group (A, B) and corresponding to each other, thereby removing ambiguities in the determined velocity.

A lidar system is described herein. The lidar system includes a transmitter that is configured to emit a frequency-modulated lidar signal. The lidar system further includes processing circuitry that is configured to compute a distance between the lidar system and an object based upon the frequency-modulated lidar signal, the processing circuitry configured to compute the distance with a first resolution when the distance is at or beneath a predefined threshold, the processing circuitry configured to compute the distance with a second resolution when the distance is above the predefined threshold, wherein the first resolution is different from the second resolution.

A radar device includes a transmission part that transmits a radar wave which has been frequency-modulated such that one measurement cycle has a rising section in which a frequency increases and a falling section in which a frequency decreases, a reception part that derives respective beat signals of the rising section and the falling section, and a signal processor that performs a precipitation determining process on the basis of an analysis of the beat signals. In the precipitation determining process, in the absence of objects other than precipitation objects from a transmission range of the radar wave, it is determined whether a spectral similarity of the frequency spectra of the rising and falling section with precipitation reference spectra is not less than a threshold, and if the spectral similarity is not less than the threshold as a result of the determination, it is determined that precipitation is present.

A waveguide device includes: a first conductive member having a first conductive surface; a first waveguide member having a first waveguide face opposing the first conductive surface; a plurality of first conductive rods on both sides of the first waveguide member; a second conductive member having a second conductive surface; a second waveguide member having a second waveguide face opposing the second conductive surface; and a plurality of second conductive rods on both sides of the second waveguide member. A first waveguide gap exists between the first waveguide face and the first conductive surface. A second waveguide gap exists between the second waveguide face and the second conductive surface. One end of the first waveguide gap is connected to the second waveguide gap, and at a connecting portion therebetween, the first waveguide face extends in a direction that intersects a plane which is parallel to the second conductive surface.