It gives compared analysis of methods of the formulation square signals by Gilbert formulation, line of delay line and frequency formulation. It cites the expressions for function of mutual correlation the exact square signal and received by one of methods. It proves that Gilbert formulation and line of delay give the mistakes when formulation square signals and be able to use for only signal with narrow stripe. In this time frequency formulations give exact calculation of amplitudeу, phase and frequency of signal with narrow and broad stripe.
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