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The accumulation method of radar echo signals is usually coherent accumulation. In coherent accumulation, the received intermediate frequency signals are added in phase and then demodulated. While the processing of signals in electronic reconnaissance receivers is non-coherent accumulation. In non-coherent accumulation, the received intermediate frequency signals are first demodulated, and after demodulation, the phase information of the signals is lost, and then accumulation is performed. Coherent accumulation adds multiple received noisy signals in phase, thereby improving the signal-to-noise ratio; the signal-to-noise ratio gain is N times.
The expression on the left side, cannot be decomposed into two parts, each consisting only of the signal component and the noise component.
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IEEE/ICACT20260352 Slide.09
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