Doppler simulation analysis of a scale target simulator

In underwater acoustic warfare, the scale target simulator need to be continuously improved in the simulation fidelity of submarine acoustic characteristics. Doppler frequency shift is one of the main parameters of submarine echo, which is an important basis for torpedo to identify true and false targets. Starting from the calculation method of Doppler frequency shift, through simulation, the Doppler frequency shift difference between the signal generated by the single receiving——multiple transmitting simulator, where the Doppler effect is due to the simulator's own speed, and the real submarine echo signal is analyzed. The results show that the differences are mainly caused by the fact that the receiving position of the single receiving——multiple transmitting simulator can not be one to one corresponding to the transmitting position. The Doppler frequency shift of the simulator is less than that of the real submarine; especially the deviation increases significantly for the Doppler frequency drift at the distance close to the length of the submarine. In the design of the scale target simulator, the simulation fidelity of the Doppler acoustic characteristic of submarine can be improved by reducing the difference.