SUBBAND METHOD FOR RADAR DETECTION OF MINIATURE UNMANNED AERIAL VEHICLES Russian patent published in 2022 - IPC G01S13/52 G01S13/66 

FIELD: radar technology.

SUBSTANCE: claimed invention relates to the field of radar for monitoring airspace. The method is based on the fact that some parts of the design of miniature unmanned aerial vehicles (MUAVs) react to short-term electromagnetic influences in the form of responses representing the corresponding oscillatory pulse characteristics. The frequency range of the effects causing the reaction is determined by the size of the reacting element. The duration of the response is inversely proportional to the width of the frequency subband in which the reaction occurs. In the claimed method, periodic probing with broadband linear-frequency modulated signals of space is carried out, as well as sampling of probing and received signals, splitting their frequency bands into subbands, the width of which is determined by the duration of the probing signal. Then, for each range gate, the exact values of the subband correlations of the emitted and received signals are calculated and accumulated, and the accumulated correlations are compared with the thresholds determined at the irradiation stage, which is carried out with the invariable absence of a MUAV in the probed space. If at least one of the accumulated subband correlations exceeds the corresponding threshold, then a decision is made on the presence of a MUAV range on this gate. Subband correlations are calculated using matrix subband filters that ensure the dependence of the filtering result only on a segment of the spectrum of the original signal in a particular subband, which, together with an increase in the signal-to-noise ratio due to noise suppression outside the subband, increases the reliability of making decisions about the presence of MUAVs on the range gate.

EFFECT: increase in the range and probability of detecting MUAVs.

4 cl