METHOD OF FINDING DIRECTION OF RADIO SIGNALS AND DIRECTION FINDER TO THIS END Russian patent published in 2008 - IPC G01S3/14 

FIELD: physics.

SUBSTANCE: essence of the proposed method lies in converting received radio signals to digital form, measuring, in each frequency sub-range at coinciding time intervals, complex spectra of signal pairs for each pair of antenna elements of an antenna array, and determination of the convolution of complex conjugate spectra. The phase difference of radio signals is obtained for each pair of antenna elements and each frequency sub-range by Fourier transformation. Standard phase differences of signals are formed and stored for all possible directions of incoming radio signals. The variance function of residual errors of phase differences is calculated from all angular parameters. The probable direction of the incoming radio signal is determined from the least sum of squares of residual errors, simultaneously with calculation of the mutual power of signals for all pairs of antenna elements and all frequency sub-ranges. The total and average power of signals is determined, as well as frequency ranges, in which values of average signal power exceeds the given threshold. Bearing values corresponding to these sub-ranges are stored. The spectrum width of signals is determined from the number of adjacent bearings of the same type. The average frequency value of the signal is determined for all detected radiation. The measured frequency band of assessed signals is separated for subsequent determination of the most probable direction of incoming radio signals. In the direction finder, which employs this method, there are also three memory devices, first, three pulse counters, second adder, divider, two comparator units, second adjustment bus, "AND" elements unit, unit for determining average signal frequency and a digital band pass filter, all connected in a well defined way between themselves and the rest of the components of the proposed direction finder.

EFFECT: more accurate measurement.

2 cl, 11 dwg