Design Of The Shock Wave Detection Processor Based On DSP

The project of developing the Supersonic and hypersonic cruise missile which has a highpenetration ability and fast attack capability is become the focus of the world’s militarypowers. Accordingly, the methods of defensing the supersonic and hypersonic cruise missilehave become a research hotspot in various countries. At present, the mainly methods ofdefensing cruise missile are the active radar method and infrared detection method. However,the active rader is in the blind area when the cruise missile fly at low altitude, as well as thedevelopment of stealth technology, it is more difficult for radar to detect the target, andmeanwhile the active detection methods are more easily exposed its orientation. The infrareddetection method attenuate seriously when meeting the hazy weather or smoke confrontion.The inherent disadvantage of the detection methods makes a single detection method difficultto reach defensive purpose. Therefore, the thesis raised a method using passive shockdetection, which detect the Supersonic weapon in ultralow-altitude as the effectivesupplement of rader and infrared detection methods, and designed the shock detectionprocessor system with the heart processor by TMS320F2812 chip .The thesis firstly introduced the acoustic feature such as waveform, frequency andamplitude of shock wave produced by supersonic weapon, which supply basis for the sensorselection, the design of hardware and the treatment of recognition algorithm. In the hardwaredesign part, with the TMS320F2812 chip as the core, the hardware circuit design wasaccomplished for the detection to the shock wave signal, including the sensor signal regulatecircuit, the signal acquisition circuit, the simulation test circuit and so on, and verified thefeasibility of circuit by experiment, measured the needed shock wave signal reliably, obtainedthe pressure, frequency trend with the change of distance via the analysis of different measuredistance. Finally, according to the structure characteristics of shock waveform in time domain,the original feature parameters of shock wave were chosen and the new feature parameters were extracted by the way of the singular value decomposition method which can reduce thefeature Matrix’s dimensionality, so that can reduce the recognition time in the premise ofensuring the recognition rate.And then the system software development was finished,including the initialization of system, the ADC module initialization and the samplingprogram, FIR filter design, Target recognition program and so on.