METHOD FOR ADAPTIVE SPATIAL-MULTICHANNEL DETECTION AND DIRECTION FINDING OF TWO FREQUENCY-INSEPARABLE RADIO-FREQUENCY SOURCES Russian patent published in 2020 - IPC G01S5/04 G01S7/292 

FIELD: radio equipment.

SUBSTANCE: invention relates to radio engineering and can be used in multichannel monopulse detectors-direction finders when receiving two frequency-inseparable signals with unknown noise intensity of receiving channels, which is typical for operation of data transmission networks, for example, 3G standard. Method comprises synchronous reception of time realizations from antenna system (AS) antenna outputs in spatial channels of direction-finding detector, simultaneously falling into current reception band, synchronous conversion of temporal realizations into digital form, fast Fourier transform. Based on the received time matrices of mutual energy matrices, the first decision statistics is calculated, comparing it with the lower threshold and the upper threshold, calculated in accordance with the Neyman–Pearson criterion and providing the required constant false alarm probability; if the second threshold is exceeded, making a decision that the spectral reading corresponds to the signal from one radio-frequency source and calculating the estimate of the azimuth and elevation angle, in case the first threshold is not exceeded – the decision that the spectral reading is noise, if the spectral reading falls between the lower and upper thresholds, additional processing is performed, calculation of the second decision statistics and its comparison with the third threshold, when it is exceeded – formation and calculation of the global maximum of the direction-finding relief, formation of the third decisive statistics and its comparison with the fourth threshold, in case of exceeding the threshold, making a decision that the spectral reading corresponds to signals from two radio-frequency sources and calculation of estimates of directions and levels of the received signals.

EFFECT: high efficiency of adaptive spatial-multichannel detection and direction finding of two frequency-inseparable radio signal sources, quantitatively manifesting in high probability of correct detection at a fixed probability of false alarm, high reliability of determining the number of frequency-inseparable radio signal sources, accuracy and reliability of determining directions of arrival and ratio of energy levels of received radio signals under conditions of additive Gaussian noise of unknown intensity.

1 cl, 8 dwg