Abstract:

Phase synchronization process in non-cooperative radar system achieved by the compensation of the prime phase via direct-path wave is analyzed. Since there is noise in the receiving channel and antenna, the prime phase of direct-path wave is stochastic. The effect of phase synchronization errors on coherent integration gain is explored for general application. The signal model and the probability density function of the phase synchronization error are presented for the purpose of coherent integration. Then, the analytical expression for the peak output of cross ambiguity processing is derived. The loss of integration is defined for the sake of evaluating the effect of phase synchronization errors. According to the mathematical model, the analysis in quantity is further conducted in different combinations of signal to noise ratio (SNR) between direct-path wave and the target echo. The simulation results show that the loss of integration will be 0.3 dB when the SNR of direct path wave is 30 dB. However, it will be very small when the SNR of direct-path wave is larger than 40 dB.