Various examples for multi-tone continuous wave detection and ranging are disclosed herein. In some embodiments, an initial signal is generated using initial radio frequency (RF) tones, and is emitted as a multi-tone continuous wave signal. The initial signal is reflected from a target and received as a reflected signal. Resultant RF tones, including a frequency, a phase and a power, are determined from the reflected signal in a frequency domain. A frequency-domain sinusoidal wave is fitted to the resultant RF tones in the frequency domain, and a distance to the target is determined using a modulation of the frequency-domain sinusoidal wave. A phase processing algorithm is applied to generate the target distance and speed by triangulating the range information encoded in the backscattered RF tones.

A radar sensor for motor vehicles, having a signal generator that is configured to generate a radar signal that contains a cyclically repeating sequence of N wave trains, where j=1, . . . , N, which are transmitted successively at time intervals T′.sub.c,j and which occupy respective frequency bands that differ from one another in terms of their center frequencies f.sub.c,j, wherein the relationship applicable to the time intervals T′.sub.c,j and the center frequencies f.sub.c,j is: T′.sub.c,j*f.sub.c,j=X, where the parameter X is constant.

A radar system utilizing a linear chirp that can achieve a larger MIMO virtual array than traditional systems is provided. Transmit channels transmit distinct chirp signals in an overlapped fashion such that the pulse repetition interval is kept short and the frame is kept short. This alleviates range migration and aids in achieving a high frame update rate. The chirp signals from differing transmitters can be separated on receive in the range spectrum domain, such that a MIMO virtual array construction is possible. Distinct chirps are delayed versions of the first chirp signal. Chirps overlap in the fast-time domain, but due to delay, there is separation in the range spectrum domain. When the delay is at least the instrument round-trip delay, transmitters are separable. Further, the wavelengths are identical across transmitters such that there is no residual-range versus angle ambiguity issue present in the claimed frequency-offset modulation range division MIMO system.

Methods and systems for monitoring a health parameter in a person using a radar system are disclosed. A method involves performing stepped frequency scanning below the skin surface of a person using at least one transmit antenna and a two-dimensional array of receive antennas, the stepped frequency scanning being performed using frequency steps of a first step size, changing the first step size to a second different step size in response to a change in reflectivity of blood in a blood vessel of the person, performing stepped frequency scanning below the skin surface of the person using the second step size after the step size is changed from the first step size to the second step size, and outputting a signal that corresponds to a blood pressure level in the person in response to the stepped frequency scanning at the first step size and at the second step size.

FMCW radar sensor including multiple high-frequency modules, which are synchronized with one another by a synchronization signal. At least one includes a transmitting part for generating a frequency-modulated transmit signal. At least two high-frequency modules, physically separated from one another, each include a receiving part for receiving a radar echo, each receiving part being assigned a mixer, which generates an intermediate frequency signal by mixing the received signal with a portion of the transmit signal, and an evaluation unit. The evaluation unit is designed to record the intermediate frequency signal over a measuring period as a function of time, and to subject the time signal thus obtained to a Fourier transform. At least one of the evaluation units is designed to window the time signal before the Fourier transform using a complex-valued window function to compensate for a propagation time difference of the synchronization signal between the receiving parts.

An FMCW radar apparatus employing frequency hopping technique in which a center frequency of each chirp signal is variable enables the accuracy of range measurement of the radar to be improved, by determining a high resolution range value based on a composite beat signal generated by determining a beat signal for each of a plurality of chirp signals, parts of respective frequency bands of which overlap one another, and then compensating the beat signal for a phase difference value.

A method is provided that includes a vehicle receiving data from an external computing device indicative of at least one other vehicle in an environment of the vehicle. The vehicle may include a sensor configured to detect the environment of the vehicle. The at least one other vehicle may include at least one sensor. The method also includes determining a likelihood of interference between the at least one sensor of the at least one other vehicle the sensor of the vehicle. The method also includes initiating an adjustment of the sensor to reduce the likelihood of interference between the sensor of the vehicle and the at least one sensor of the at least one other vehicle responsive to the determination.

The system and method represents a high-resolution, three-dimensional, multi-static precipitation RADAR approach that employs agile microsatellites, in formation and remotely coupled. This system and method uses multi-static RADAR interferometric methods implemented via a microsatellite formation to synthesize an effectively large (e.g., 15 m when using the Ku RF band) aperture to provide about 1 km horizontal resolution and about 125 m vertical resolution.

A feature quantity calculation unit calculates one or more predetermined types of feature quantities using information correlated to respective extracted peaks. An environment determination unit calculates a specific environment probability from a calculation result of the feature quantity calculation unit using the positive distribution and a non-specific environment probability from a calculation result of the feature quantity calculation unit using the negative distribution. The environment determination unit further determines whether the mobile body is in the specific environment or the non-specific environment in accordance with a result of integration of the specific environment probability and the non-specific environment probability which are calculated for respective feature quantities.

A feature quantity extraction unit extracts at least one type of feature quantity using at least one of information associated with an instantaneous value generated by an instantaneous value generation unit and information associated with a target object member generated by a connection determination unit. A virtual image determination unit calculate a virtual image probability from a virtual image distribution and a real image probability from a real image distribution for each target object member generated by the connection determination unit using an extraction result related to the target object member of the feature quantity extraction unit. The virtual image determination unit further determines whether or not the target object member is a virtual image according to a result of integrating the calculated virtual image probability and the calculated real image probability.