Signal Detection Software For Underwater Acoustic Communication Signal Reconnaissance System Design And Implementation

In the field of marine military confrontation,it is necessary to intercept and interfere with enemy targets through underwater acoustic communication signal reconnaissance systems.However,underwater acoustic communication signals are often unknown,it is often difficult for a single signal detection algorithm to achieve the best detection results.At the same time,in the case of large data transmission,the real-time requirements of the reconnaissance system are often difficult to meet.The design and implementation of an efficient and feasible underwater acoustic communication signal reconnaissance system is still a difficult problem.This thesis focuses on the design and implementation of the signal detection software of the underwater acoustic communication signal reconnaissance system,including the research of the underwater acoustic communication signal detection technology,the design and development of the signal detection software module,and the software function test verification.First of all,for the signal detection algorithm design part of the reconnaissance system,this thesis focuses on the instantaneous correlation integral detection method,the spectrum reprocessing detection method,the short-time fractional Fourier transform detection method,and the cyclic spectrum detection method.The principle and performance characteristic of each algorithm are simulated and analyzed,and the detection performance of each algorithm is analyzed through several common underwater acoustic communication signals.The simulation verifies that each algorithm can achieve effective detection of underwater acoustic communication signals under the condition of low signal-to-noise ratio.At the same time,this paper proposes improved algorithms for the instantaneous correlation integration method and the spectrum reprocessing method.Simulations verify that the improved instantaneous correlation integration method can effectively reduce the adverse effects caused by the uncertainty of the integral length,and the improved spectrum reprocessing method can effectively reduce the interference of noise.Both algorithms can improve the detection performance to a certain extent.Secondly,for the design and implementation of the signal detection software of the reconnaissance system,this paper selects TI's multi-core high-performance signal processor TMS320C6678 as the core processing chip,and uses the serial Rapid IO interface as the main data transmission interface to integrate multiple advanced DSP chips.The mezzanine board is a hardware implementation platform,based on the SYS/BIOS operating system,the signal detection software platform is built through CCSV6,and through functional modular management,completes the design and implementation of the data transmission module,signal processing module,data storage module and program loading module.Finally,for the testing of the signal detection software of the reconnaissance system,this thesis has verified the software function in the laboratory electric joint debugging environment.The main tests include the SRIO interface rate test,the signal detection software processing performance test and the program loading test.The detection performance of the signal detection software is also tested by the lake test data.The test shows that the signal detection software designed in this thesis has practical engineering application value.