3results about "Multi-channel direction-finding systems using radio waves" patented technology

The application discloses a two-dimensional Root-MUSIC angle automatic pairing method and system based on signal receiving timing, and specific steps of the method are as follows: step 1, a Root-MUSIC algorithm mathematical model suitable for angle estimation of two orthogonal arrays of an L-shaped array is constructed, the Root-MUSIC algorithm is applied to the two orthogonal arrays respectively, and a set of azimuth angles and a set of elevation angles are estimated; step 2, timing detection and dynamic grouping are carried out based on signal arrival timing, and simultaneous multi-signal receiving processing is converted into a single-signal processing flow organized according to timing; the Root-MUSIC algorithm is executed on each group of signals, and pairing of the azimuth angles and the elevation angles is automatically completed; and step 3, the pairing result of step 2 is stored, and whether the pairing process is ended is judged, if yes, the angle pair is output in sequence. The application constructs a joint processing mechanism of timing detection-dynamic grouping-serial processing, converts traditional multi-dimensional matching calculation into a simple timing alignment operation, and makes angle pairing become a natural derivative result of the signal processing flow.

A radar system (1) for detecting occupied frequency channels is proposed, comprising N reception channels (20n) each capable of receiving signals (Srn). The system comprises, for each channel (20n), a unit (22n) for converting said received signals (Srn) into the spectral domain to form a signal (Sn) converted onto an instantaneous frequency band associated with frequency channels (F), a module (24n) for determining correlation values ​​(Rn(F)) applying a power correlation between the spectrum of the converted signal (Sn) and the spectrum of an arbitrary reference signal chosen from one of the converted signals propagated on one of said channels, and an evaluation module (30) determining the values ​​of the sum channel from the correlation values ​​(Rn(F)), the frequency channel (F) being occupied if the value of the associated sum channel is greater than a predefined detection threshold value.