RU2013121983A - METHOD FOR DETECTING LOW-MOBILE MOBILE OBJECTS - Google Patents

Abstract

1 A method for detecting inconspicuous moving objects, which consists in the fact that they use direct and scattered by moving objects broadband radio signals emitted by transmitters of various electronic systems, coherently receive an array of multipath radio signals including direct and scattered radio signals, synchronously convert the received radio signals to antennas into digital signals characterized in that they convert the digital signal of each antenna into a time delay and Doppler corrected For a known frequency shift for a known transmitter state, the digital signal s, where is the antenna number, combine the corrected digital signals s into the matrix of corrected signals C, which are converted into the spatial correlation matrix of the corrected signals G = CC and into the signal matrix F = CC, find the largest eigenvalue of the correlation the matrix of corrected signals G and the main eigenvector of the signal matrix F corresponding to the found eigenvalue, identify the found value of the main eigenvector as a direct digital signal that is stored, a normalized cross-correlation coefficient is formed between the direct digital signal and the corrected digital signal of each antenna, a differential digital signal of each antenna is obtained, the differential digital signal of each antenna is converted into a time delay and a Doppler frequency shift for a given set of hypothetical state of objects differential digital signal, corrected differential digital signals

Claims (1)

1 A method for detecting inconspicuous moving objects, which consists in the fact that they use direct and scattered by moving objects broadband radio signals emitted by transmitters of various electronic systems, coherently receive an array of multipath radio signals including direct and scattered radio signals, synchronously convert the received radio signals to antennas into digital signals characterized in that they convert the digital signal of each antenna into a time delay and Doppler corrected For the known state of the transmitter, the digital signal s _n , where $$n=\overline{\mathrm{one,}N}$$

- the antenna number, combine the corrected digital signals s _n in the matrix of corrected signals C, which is converted into a spatial correlation matrix of corrected signals G = C ^N C and in the signal matrix F = CC ^N , find the largest eigenvalue of the correlation matrix of corrected signals G and corresponding to the found the eigenvalue of the main eigenvector of the signal matrix F, identify the found value of the main eigenvector as a direct digital signal $$\widehat{u}$$

stored form a normalized cross-correlation coefficient $${\widehat{\beta }}_n={\widehat{u}}^H{s}_n/{\Vert \widehat{u}\Vert }^2$$

between direct digital signal $$\widehat{u}$$

and a corrected digital signal s _{n of} each antenna, a differential digital signal of each antenna is obtained $${\widehat{s}}_n=s_n-{\widehat{\beta }}_n\widehat{u}$$

convert the differential digital signal of each antenna $${\widehat{s}}_n$$

in the time difference and Doppler frequency shift corrected for a given set of hypothetical states of objects, a difference digital signal $${\tilde{s}}_n$$

, corrected differential digital signals $${\tilde{s}}_n$$

all antennas are combined into a matrix of difference signals $$\widetilde{\mathrm{Ts}}$$

matrix of difference signals $$\widetilde{\mathrm{Ts}}$$

transform into a spatial correlation matrix of difference signals $$\tilde{G}={\widetilde{\mathrm{Ts}}}^H\widetilde{\mathrm{Ts}}$$

find the largest eigenvalue of the correlation matrix of difference signals $$\tilde{G}$$

, after comparing it with a threshold, a decision is made to detect a moving object with the current hypothetical state of the object.