FIELD: radio engineering.
SUBSTANCE: invention can be used to detect radio emission sources (RES) with linear frequency modulation (LFM) and determine the parameters of their movement. In the claimed method, RES signals are received by three antennas, one of which is directed to RES, and the other two to terrain elements with known coordinates of the predominant re-reflection of RES signals. After autocorrelation processing of each received signal and their bandpass filtering at the difference frequency, estimating the values of the difference frequencies of the signals in the three receiving channels and calculating the differences in the time of arrival of the RES signals relative to each other, taking into account the time for the signals to travel the known distances between the PP and the side imaginary PP, RES coordinates are determined by calculating the coordinates of the point of intersection of the position lines – hyperbolas. Moreover, after evaluating the values of the difference frequencies of the output signals, the signals at the outputs of the three receiving channels are identified by coincidence with the specified accuracy of the difference frequencies of the maxima of their amplitude-frequency spectra. At a fixed time interval, the estimates of the RES coordinates are averaged for at least two points in time, and the linear speed and heading angle of the RES movement are determined from them.
EFFECT: expand the functionality of a single-position difference-range method by determining for at least two points in time the linear velocity and heading angle of the RES of linear-frequency-modulated signals.
1 cl, 1 dwg
