Shipborne Underwater Acoustic Transceiver Signal Processing Platform Software Design

Long baseline acoustic positioning system covered in this paper includes the display and control platform,shipborne underwater acoustic transceiver and transponder array.In this system,the underwater acoustic transceiver participates in the completion of measuring array,calibrating array,ranging inquiry for transponder array,and is responsible for sending interrogation signals and remote control commands,receiving transponder response signals and command response signals,processing the received signals and uploading results to the display and control platform.This paper mainly completes shipborne underwater acoustic transceiver signal processing platform for software design and implementation,including the estimation of multiple transponders response signal transmission delay,the detection of acoustic remote control commands,uploading results to display and control platform for assisting it to complete its designated functions.This paper first studies the theory of the correlation delay estimation based on speed sliding correlation and the signal detection based on adaptive Notch filter,then designs the implementation scheme of the corresponding algorithm respectively,and they were designed in a shipborne underwater acoustic transceiver signal processing platform software to complete the estimation of multiple response signal transmission delay and the detection of acoustic remote control commands,the results of simulation show that these two algorithms can achieve the required performance guidelines of the shipboard acoustic transceiver signal processing platform software.TI 's TMS320C6678 is chosen as the shipborne underwater acoustic transceiver signal processing hardware platform core processor,and it is multi-core high performance fixed /floating-point digital signal processor.In order to facilitate achieving the independence between modules and communication between cores,multi-core DSP software design in this paper is based on the embedded real-time operating system SYS / BIOS.Combined with the simulation studies of these two algorithms,the software design in this paper allows core 0,core 1 and core 2 in DSP to respectively achieve network data transmission,correlation delay estimation and acoustic remote control commands detection,and each core through communication between the cores to achieve data sharing.Finally,through the test of network data transmission module,correlation time delay estimation module and acoustic remote command detection module in multi-core DSP software design,the paper verifies the shipborne underwater acoustic transceiver signal processing software platform design to meet the requirements of the system reliability andtimeliness,and can properly fulfill the specified function of the system.