Dsp-based Passive Acoustic Positioning Technology

The intelligent mine will be the most important weapon system to defend arming helicopter hedgehopping in future war. Passive acoustic detection technology is the key technology. With the researching of the national defence pre-researching project which is the research of acoustics compound fuse of anti-helicopter intelligent mine, this paper presents two type of acoustic localization algorithm ,emphasizes the discussion of algorithm and presicion of space acoustic localization with sensors at different height in detail and compares them.The paper analyzes the characteristic of aerodynamics with structure of helicopter propeller blade , dissertrates vortex theory and the theory about gliding air field which produce the power of helicopter propeller blade. At the same time it also deduce the method of computing the induced velocity produced by helicopter propeller blade with vortex theory. At last,an influcence to the spreading of sound is discussed.In order to satisfy the need of real time and accuracy of the passive acoustic localization, we use floating DSP as CPU for computing. A whole software system of the passive acoustics detection system has been worked out. The software can satisfy the need of time and accuracy simultaneously, and worked stably.