Performance Simulation of Direct-Sequence Spread-Spectrum Signal Considering Transmitter Characteristics for Range Estimation in the Deep Sea

Abstract

It is important to estimate the range between a transmitter and a receiver in the sea in position monitoring and navigation. For precise range estimation, the synchronous signal between the transmitted signal and the received signal must be extracted. However, it is difficult because of interference due to the multipath propagation. In this paper, we considered the direct-sequence spread-spectrum (DSSS) system with binary phase shift keying (BPSK) modulation generally adopted for range estimation in the deep sea and discuss the three different simulation results of range estimations from peak detection with cross-correlation. To examine how the transmitter characteristics affect the range estimation performance, the range estimation performance of DSSS signals with BPSK is simulated first with only random noise, then with random noise and the transducer band-limited frequency response, and finally with random noise and the inverse filter of the transducer. It is found that the frequency response characteristics of the transmitter affect the range estimation accuracy.