Research On Dual-DSP Board And Realization Of Multi-beam Bathymetry Detection Algorithm

Multi-beam bathymetry detection system is a seafloor mapping equipment with high efficiency, high accuracy and excellent resolution, especially fitted for wide sweep mapping. As progressing of the ocean exploitation, the requirement for the accuracy of submarine topography is raising. We can increase the number of the forming beams or adopt multiple subarrays detection method and interferometric method to enhance the resolution ability of the multi-beam bathymetric detection system. No matter which method we take, it will increase the operations of the algorithm, as well as the demands of signal processing capacity of the system. Along with the development of technology, the performance of Digital Signal Processor has been enhanced. But the requirement of massive processing for large scale scientific computation and high speed real-time signal processing still could not be met by the single processor systems. In that case, people usually apply the systems based on the architecture of multi-DSP or DSP-FPGA to increase the capability of signal processing.The thesis involves two hardware platforms:ADSP-TS201S EZ-KIT Evaluation Board and the DSP-FPGA signal processing module. On the ADSP-TS201S EZ-KIT Evaluation Board, we focus on the development and application of the ADSP-TS201S, so that we can evaluate the processing capability of single DSP and the parallel algorithm in dual-DSP. Based on the requirements of the multi-beam bathymetry detection system, we complete the signal processing in the ADSP-TS201S which is on the DSP-FPGA signal processing module.The main research of this thesis focuses on the three aspects as following:firstly, exploiting the hardware resources on the ADSP-TS201S EZ-KIT Evaluation Board provided by Analog Devices, including the bootloader program with external FLASH, the external memory expansion and the communications between the dual-DSP based on LinkPort etc. Secondly, we present an improvement for amplitude based method, which is one of the traditional algorithms for the multi-beam bathymetry detection system, and implement it in the ADSP-TS201S EZ-KIT Evaluation Board, in both one DSP and dual-DSP respectively. Thirdly, based on the task of "portable Multibeam Bathymetric System", we transplant the code composed on the Evaluation Board into the DSP-FPGA module, including the external memory expansion, the communications between the DSP and the FPGA based on external bus interface and the implementation of the multi-beam bathymetry detection algorithm.The experiment results show that the system is robust and have met the design requirements, fully satisfied the real-time requirements on signal processing of the certain multi-beam bathymetry system.Finally, the general work of this thesis is summarized and the further research direction is pointed out.