Co-Design of Underwater Detection and Communication-Part II: Communication-Based Shared Waveform

Compared with the integrated waveform of the Part I, its waveform has stronger detection ability but the communication signal is suppressed. This will not be conducive to networking positioning. Based on this, a comprehensive waveform design scheme for underwater detection and communication based on direct sequence spread spectrum and Gaussian min-imum shift keying (GMSK) waveform is proposed. The scheme realizes the detection of the target by collecting the echo of the communication signal reflected by the target. In this scheme, the communication signal is expanded, and then modulated onto the carrier as an integrated signal through GMSK modulation. The detection performances of minimum shift keying (MSK), GMSK and underwater acoustic modulation signals under different parameters are compared by a fuzzy function. The underwater echo model is established, and the performance of MSK and GMSK target estimation is analyzed. For the echo signal, it is first demodulated and then despread, and the PN code at the receiving end needs to be synchronized with the PN code at the transmitting end. And the bit error rate of the integrated signal is analyzed. Simulation results show that the designed integrated waveform is effective.