The Design Of Ultrashort Baseline Positioning System Digit Signal Processing Platform

Ultrashort Baseline Positioning System play an important role in underwater scientific investigation,marine resources exploration and marine defense construction and so on,which is the key techology to ensure the normal operation of submersible.Ultrashort Baseline Positioning System use the time delay of acoustic wave propagation underwater and the phase difference of acoustic signal to range and direction the underwater target to achieve the purpose of tracking and positioning.The digital signal processing circuit of the Ultra-short Baseline Positioning System designed in this thesis is the core part of the whole system,which provides important support for realizing underwater positioning and has important effect of the system performance.Based on the requirements of the digital platform of the Ultra-short Baseline Positioning System,in this thesis,three TMS320C6416 T DSPs and one high-performance Stratix II EP2S90F780I4 N FPGA are used as the data processing and control core of the system.On this basis,peripheral functional modules are designed for the circuit.The three-chip DSP takes the master-slave structure as the processing core of the system target time delay estimation and positioning solution.The FPGA cooperates with the DSP to locate the parameter configuration,data acquisition and storage,band-pass filtering and serial communication of the system.The system use an eight-The ADS8568 chip to realize the acquisition of the analog signal and the raw data is stored by the realization of the SOPC embedded soft-core system.The self-test signal transmission and control circuit is designed according to the actual demand,so that the system can self-Ethernet chip W5300 to achieve GPS signal reception and positioning results of the upload..In software,FPGA and DSP driver are written to realize the sampling,FIR band-pass filtering and data transmission.Based on MicroC / OS operating system,the Nios II processor's Ethernet communication driver is written,To preserve the original collection of data to achieve the Ethernet port W5300 data transmission and system self-test function.After the debugging of each module circuit,the result is compared with the expectation.The results show that the digital platform of the ultra-short baseline positioning system is ideal and stable,which meets the design requirements.