A controller for a FMCW radar system configured to: provide for emission by the FMCW radar system of a plurality of consecutive frequency modulated detection signals for detection and ranging, each of the frequency modulated detection signals varying between an initial frequency and a final frequency over a period of time extending from a start time to an end time; wherein at least one of said consecutive frequency modulated detection signals is provided with an offset to one or more of; the start time of the detection signal relative to a predetermined start time schedule; the end time of the detection signal relative to a predetermined end time schedule; the initial frequency of the detection signal relative to a predetermined initial frequency schedule; and the final frequency of the detection signal relative to a predetermined final frequency schedule;
the offset based on a random value.

A sensing system. In some embodiments, the system includes a first imaging radio frequency receiver, a second imaging radio frequency receiver, a first optical beam combiner, a first imaging optical receiver, a second optical beam combiner, and an optical detector array. The first optical beam combiner may be configured to combine optical signals of the imaging radio frequency receivers. The second optical beam combiner may be configured to combine the optical signals of the imaging radio frequency receivers, and the optical signal of the first imaging optical receiver.

Disclosed are a method and device for measuring a headcount by using a peak value distribution pattern of a radar reception signal according to the headcount. The method for counting people by using a UWB radar disclosed herein comprises: a step of computing, for each predetermined headcount, an amplitude probability density function based on the distance between a reflection point and a radar, by using a sample radar reception signal for the headcount; a step of calculating likelihood values with respect to the headcounts from a measured radio reception signal by using the probability density function; and a step of determining a headcount corresponding to the largest likelihood value among the calculated likelihood values, as a final headcount with respect to the measured radar reception signal.

A radar system wherein a radar return is channelized by frequency into a plurality of channels, and each of the channels is sampled by a respective analog-to-digital converter that has a sampling rate less than the Nyquist rate of the radar return. The digitally sampled channel signals are Fourier transformed into the frequency domain, where each of the frequency-domain channel signals is matched-filtered according to a respective partial matched filter. The channel signals are then transformed back to the time domain, whereupon they are added together to generate the impulse response of the radar system responsive to the radar return.

Provided is a radar device including: a transmission circuit that transmits a first transmission signal and a second transmission signal which have frequencies different from each other; a reception circuit that receives the first transmission signal and the second transmission signal which are reflected by one or a plurality of objects as a first reception signal and a second reception signal, a processor, and a memory that stores a command group executable by the processor. Quadrature demodulation is performed with respect to each of the first reception signal and the second reception signal, at least one of the first reception signal and the second reception signal is rotated on an IQ plane in correspondence with a predetermined phase angle corresponding to a predetermined distance, and the first frequency or the second frequency, the first reception signal and the second reception signal of which one is rotated is added or subtracted, and the one or plurality of objects are detected on the basis of a processing result of a processing means.

A vehicle, radar system of the vehicle and method of operating a radar system. The radar system includes a first sensor that generates a first chirp signal; a second sensor for generating a second chirp signal and which received reflected signals. One of the first sensor and second sensor receives a signal that includes a first reflected signal related to the first chirp signal and a second reflected signal related to the second chirp signal. A processor multiplies the received signal by one of the first chirp signal and the second chirp signal to obtain a desired signal indicative of one of the first reflected signal and the second reflected signal and an interference signal indicative of the other of the first reflected signal and the second reflected signal, and applies a filter to the mixed signal to separate the interference signal from the desired signal.

A communication system, method and computer program product enable transmitting information via the same spectrum as a multiple-input multiple-output (MIMO) radar using the same spectrum. First, a radar system conducts a search mode using a MIMO radar waveform. Second, an uplink communications transmitter employs a new type of signaling that allows the radar to search for targets in the spatial direction of the communication transmitter. Specifically, the MIMO radar can conduct a search task while receiving data from a communication transmitter using the same frequency allocation without blinding the MIMO radar in the direction of the target.

A signal power detection method is fused with a double-difference phase modulation detection method to provide a higher-performance method of pulse detection for any digital receiver. The first pulse detection technique uses a signal power threshold. When the square of the magnitude of a pulse crosses the signal power threshold, the beginning of a pulse is declared and pulse processing starts. The second pulse detection technique is model based and uses a windowed detector that crosses a phase difference threshold when the pulse has consistent second-order (in general d-th order) difference phase values within the window. The first technique has low latency and is independent of pulse width, but only operates well at SNR values greater than 15 dB. The second technique has higher latency and requires a minimum pulse width, but operates at lower (approximately 0 dB) SNR values.

A method for measuring, using a radar or sonar, the velocity with respect to the ground of a carrier moving parallel to the ground, includes the following steps: a) orienting the line of sight of the radar or sonar toward the ground; b) emitting a plurality of radar or sonar signals (P.sub.1-P.sub.N) that are directed toward the ground, and acquiring respective echo signals (E.sub.1-E.sub.N); c) processing the acquired echo signals so as to obtain, for one or more echo delay values, a corresponding Doppler spectrum; d) for the or at least one the echo delay value, determining a high cut-off frequency of the corresponding Doppler spectrum; and e) computing the velocity of the carrier with respect to the ground on the basis of the one or more high cut-off frequencies. A system allowing such a method to be implemented.

A detection method, a detection device, a terminal, and a detection system are provided, for detecting a state of a target object in a detection area. The detection method includes: filtering a millimeter-wave radar signal received in the detection area; and extracting features suitable for indicating a motion mode of the target object in the detection area from each frame of the filtered millimeter-wave radar signal; monitoring an initial change point of the features through a flow window; caching a predetermined number of features starting from the initial change point; and identifying the cached features by a classifier to determine the state of the target object in the detection area.