Abstract:

A quick parameters estimation method based on the integral-envelope is proposed to estimate the parameters of binary phase shift keying (BPSK) and linear frequency modulation (LFM) signals in the low probability of intercept (LPI)  radar. First, rough recognition to radar-signals is achieved by using fast Fourier transform (FFT). Then, the integral-envelope is used to process signals, and a certain threshold is set to the two types of signals respectively. Finally, the code-rate of BPSK signals can be calculated quickly by searching the peaks of integral-envelope. The FM slope, initial frequency and terminal frequency can also be got according to the given rules by searching the zero-points. The algorithm has the advantages of high speed, preciseness, and the algorithm can be carried out easily. The experimental results show the effectiveness of the algorithm, at the same time, it has the stronger capability on anti-noise.