Numerical simulation for the sea echo spectrum of OTHR radar based on JONSWAP sea spectrum

Introduced Barrick´s first-order and second-order sea echo section equations of HF radar. Based on the second-order section equation, this paper submits an algorithm to simulate the sea echo spectrum of HF radar. In the polar coordinate, the method decomposes the sea wave-number space from two dimension to one-dimension, and adds up the second-order spectrum from all one-dimension to form the whole second-order spectrum. The simulation algorithm is easy to program and calculate at a higher speed. The simulated results are identification with those using other methods. And in order to adapt to the actual situation in China, JONSWAP sea spectrum Which is different from PM sea spectrum is used in this paper, the sea echo spectrum simulated is more suited to the sea area in China, It´s good to extract the sea state parameters from the spectrum.