METHOD FOR DETECTION AND DIRECTION FINDING OF RADIO SIGNALS Russian patent published in 2006 - IPC G01S3/00 G01S5/04 

FIELD: radio engineering, in particular, radio direction finding.

SUBSTANCE: radio signals are received with the aid of omnidirectional aerials forming an N-element aerial array, complex amplitudes of radio signals are measured at the outputs of the aerials, they are transformed to a first-order angular spectrum, the values and co-ordinates of the square maximum of its modulus are determined, the mean power of the complex amplitudes of radio signals in total of the aerials is determined, the first-order angular spectrum with due account made for the co-ordinates of its maximum is transformed to the second-order angular spectrum, the co-ordinates and the values of the square maximum of its modulus are determined, the value of the square maximum of the modulus of the first-order angular spectrum is normalized to the mean power, the number of radio signals and the angles of their incoming are judged according to the results of normalization and the co-ordinates of the maxima. The normalized values of the maxima of the squares of the angular spectra modi are summed up and compared with the first threshold, if it is not exceeded the absence of radio signals is determined, otherwise, the relationship between the result of subtraction of the sum of the values of the squares of the angular spectra modi from unity and the result of subtraction of the value of the maximum square of the first-order angular spectrum modulus from unity, the obtained relationship is compared with the second threshold, if it is exceeded, the presence of one radio signal is fixed, otherwise - of two radio signals. The values of the thresholds are determined according to the Neumann - Pearson's criterion proceeding from the preset probability of false alarm, quantity, mutual location of the aerials, radiation wavelength and the preset error of direction finding.

EFFECT: enhanced efficiency of detection and direction finding at reception of radio signals of two sources of radio emission, as well as at an unknown dispersion of noise of the receiving channels.

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