Hardware And Software Design Of Digital Electromagnetic Receiver

The active electromagnetic proximity fuse is one of the most widely used fuses for Chinese torpedo. It has developed rapidly these years and the circuits have been mature. But these mature circuits are mainly composed of analog circuits and some numerical control components. The lack of programmability, flexibility of ajusting the parameters and function enhancing space has restricted the weapons'developing. The development of technology, especially in the field of transducer, DSP, recognition and microcomputer, will improve the fuse's reliability and anti-jamming ability at a great extent. The self-adapting ability to choose the right detonation time will also be developed. The expected receiver will be smaller, programmable, and multi-moded with low dissipation, high performance and high reliability.The receiver of torpedo fuss is the key cluster of non-contact fuse system. It is designed to amplify and filter the minute signal from the antenna. It has the function of self-adapting compensation and detecting actual target signals as well. The digital receiver adopted DSP and FPGA as processor and controller, which simplified the structure and enhanced its function. This essay is to analyze the self-adapting compensation, synchro demodulation and their applications on DSP. With self-adapting compensation, the compensation speed could achieve 5 times than before according to the previous method. We adopted glide DFT skill instead of the traditional synchro demodulation methods, which strengthened the ability of real-time detection and anti-interference.