Algorithm for Microwave Radiation Parameters Estimation at the Output of a Passive Radar Quadratic Detector

The problem of finding the algorithm for estimating the spectral power density (SPD) of the input signal of the receiver when observing the signal from the output of the quadratic detector of the receiver is solved. Formulas for calculating the boundary errors in estimating the SPD parameter and the fluctuating sensitivity of a radiometric receiver operating according to the obtained algorithm are obtained. The possibility of using the likelihood functional for stationary Gaussian processes in solving the problem of signal processing after a quadratic detector is substantiated by simulation modelling.