RU2005131143A - METHOD FOR AUTOCORRELATION RECEPTION OF NOISE-LIKE SIGNALS - Google Patents

Claims (1)

The method of autocorrelation receiving noise-like signals, which consists in multiplying the received signal with a reference signal, measuring the duration of the received signal, performing frequency detection of the received signal, thereby highlighting the moments of phase jump, determining the number and magnitude of the clock periods, while the reference signal is formed by delaying the received signal for the time τ _z1 = K ₁ τ _e , a multiple of the clock period τ _e , the total voltage is isolated, it is multiplied with the received signal ohm, delayed for a time τ _s2 = K ₂ τ _e , a multiple of the clock period τ _e , isolate the voltage of the difference frequency, multiply it with a received signal, delayed for a time τ, which periodically varies according to the linear law, allocate a low-frequency voltage proportional to the autocorrelation function, compare it with a threshold level, when the threshold level is exceeded, a cyclic shift is measured, which determines the code structure of the signal being determined, characterized in that noise-like signals are received at the receiving antennas s spaced a fixed distance d ₁ and d _2, and arranged in a geometric right angle, the vertex of which is placed a reference channel antenna common to the antennas of the two direction-finding channels disposed in the azimuth and elevation planes, in each channel the received noise-like signal is multiplied itself harmonic oscillation is distinguished by themselves, phase-shifted by 90 ° the harmonic oscillation of the reference channel, the phase differences between it and the harmonic oscillations of the direction-finding channels are measured, thereby forming The new reference scales of the azimuth α and elevation angle β of the radiation source of noise-like signals, accurate but ambiguous, multiply the noise-like signal of the reference channel with time-delayed noise-like signals of direction finding channels, select low-frequency voltages proportional to the cross-correlation functions, change the delay time to obtain the maximum value of cross-correlation functions supporting these values, fixed time delays τ ₁ and τ _2, corresponding to the maximum cross-correlation value nnyh functions, and determining the azimuth and elevation angle α β radiation source of noise signals

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, where c is the speed of light propagation, thereby forming a time frame for reading the angular coordinates α and β, rough, but unambiguous.