A digital self-injection-locked (SIL) radar includes a digital SIL oscillator, a wireless signal transceiver and a digital frequency demodulator. The digital SIL oscillator generates a digital output signal. The wireless signal transceiver is electrically connected to the digital SIL oscillator to convert the digital output signal into a wireless signal for transmission to a target, receives a reflected signal from the target, and converts the reflected signal into a digital injection signal for injection into the digital SIL oscillator. Accordingly, the digital SIL oscillator operates in an SIL state and generates a digital oscillation signal. The digital frequency demodulator is electrically connected to the digital SIL oscillator to receive and demodulate the digital oscillation signal into a digital demodulation signal.

A digital self-injection-locked (SIL) radar includes a digital SIL oscillator, a wireless signal transceiver and a digital frequency demodulator. The digital SIL oscillator generates a digital output signal. The wireless signal transceiver is electrically connected to the digital SIL oscillator to convert the digital output signal into a wireless signal for transmission to a target, receives a reflected signal from the target, and converts the reflected signal into a digital injection signal for injection into the digital SIL oscillator. Accordingly, the digital SIL oscillator operates in an SIL state and generates a digital oscillation signal. The digital frequency demodulator is electrically connected to the digital SIL oscillator to receive and demodulate the digital oscillation signal into a digital demodulation signal.

Object detection systems and methods are provided. An object detection system comprises a plurality of nodes, each node having a transmitter configured to transmit a radar signal as a beam, and one or more receivers configured to receive a reflected radar signal. The nodes and transmitters are arranged such that the radar beam of one transmitter at least partly overlaps with the radar beam from the transmitter at an adjacent one of the nodes. The object detection system comprises a processor configured to receive a digitised signal from each node, process the digitised signal to detect characteristics of any Doppler effects created by the movement of an object through one or more of the radar beams, compare the Doppler characteristics with Doppler signatures associated with known objects, and thereby classify the object.

Systems, methods, and apparatus for identifying and tracking UAVs including a plurality of sensors operatively connected over a network to a configuration of software and/or hardware. A computing device can tune the RF receiver to a particular frequency set. The computing device can receive RF signal data corresponding to a plurality of RF signals via the RF receiver. The computing device can detect a plurality of signal characteristics corresponding to the plurality of RF signals from the RF signal data. The computing device can identify a matching RF signal by comparing the RF signal data to a plurality of known RF signals. The computing device can apply a predetermined rule set to the matching RF signal to determine at least one action to take.

An apparatus configured to receive an input dataset, x, indicative of radar signals reflected from targets as received at a plurality of antenna elements; define a matrix, A, formed of direction-of-arrival-angle vectors, a.sub.n, each direction-of-arrival-angle vector representing an expected response at the plurality of antenna elements of radar signals from one of the targets; define a signal amplitude vector s to represent expected complex amplitudes as received in the radar signals; define an objective function based on x, A and s; search for a set of direction of arrival angles for each of the plurality of targets by the repeated evaluation of the objective function for a plurality of candidate matrices based on matrix A; and wherein said search space comprises a plurality of discrete points, z, associated with the direction of arrival angles by a function of sin(θ.sub.k).

A radar device derives, plurality of parameters according to a target and target detection distances, based of received signals that are acquired by receiving reflected waves, each of which is a radar transmission wave transmitted toward vicinity of an own vehicle and then reflected from the target existing in the vicinity. The radar device computes, from likelihood models in which first and second already-known correlations are modeled for each of the detection distances, an indicator based on likelihood ratios, which correspond to derived parameters and detection distances, of a stationary vehicle and upper object, in which the first already-known correlations correlate parameters and likelihoods of the stationary vehicle with each other and second already-known correlations correlate the parameters and likelihoods of the upper object with each other. The radar device performs a threshold determination on the computed indicators to determine whether the target is the stationary vehicle or upper object.

There is provided a radar device. The radar device is configured to derive information on a target existing in a surrounding area of a vehicle which is equipped with the radar device on the basis of a reception signal obtained by receiving a reflected wave which is obtained by reflection of a transmission wave transmitted to the surrounding area, from the target. A determining unit is configured to determine whether the target is related to an upper object, on the basis of an integrated value of a reception level of the reception signal related to the target, and an integrated value of ground velocity related to the target.

There is provided a radar device which is mounted on a moving object and configured to detect a target on the basis of reception signals acquired by receiving reflected waves from the target by receiving antennae. A transmitting unit has a transmission axis substantially parallel to a traveling direction of the moving object. The transmitting unit is configured to transmit transmission waves around the transmission axis as a center thereof. A determining unit is configured to determine upward axis misalignment or downward axis misalignment of the transmission axis, on the basis of the reception signals acquired by receiving the reflected waves of the transmission waves.

A radar apparatus includes: a transmission unit that transmits a chirp signal; a reception unit that receives a reflected signal that is the chirp signal reflected by a scatterer; and a pole calculation unit that calculates a beat signal based on the chirp signal and the reflected signal and calculates a pole of the beat signal by eigenvalue decomposition of an autocorrelation matrix of the beat signal. The radar apparatus further includes: a complex amplitude calculation unit that calculates a complex amplitude corresponding to the pole by using a least squares method between a basis waveform corresponding to the pole and the beat signal; a distance calculation unit that calculates a distance to the scatterer based on the beat signal; and an intensity calculation unit that calculates an intensity of the reflected signal based on the complex amplitude.

A radar apparatus includes: a transmission unit that transmits a chirp signal; a reception unit that receives a reflected signal that is the chirp signal reflected by a scatterer; and a pole calculation unit that calculates a beat signal based on the chirp signal and the reflected signal and calculates a pole of the beat signal by eigenvalue decomposition of an autocorrelation matrix of the beat signal. The radar apparatus further includes: a complex amplitude calculation unit that calculates a complex amplitude corresponding to the pole by using a least squares method between a basis waveform corresponding to the pole and the beat signal; a distance calculation unit that calculates a distance to the scatterer based on the beat signal; and an intensity calculation unit that calculates an intensity of the reflected signal based on the complex amplitude.