伪码引信的数字多相滤波和频域脉冲压缩

Digital Poly-phase Filtering and Pulse Compression of PN-code Fuze

针对传统伪随机码引信对回波信号时域相关处理法在处理大点数、大压缩比信号时的不足,提出采用软件无线电技术中的多相滤波数字正交检波器和频域数字脉冲压缩的方法。分别使用FPGA和DSP实现多相滤波数字正交检波器以及频域数字脉冲压缩。对FPGA及DSP进行的仿真与Matlab对整个过程仿真的结果比较,误差极小,验证了理论的正确性。数字脉压技术以其性能稳定、抗干扰能力强、控制方式灵活和硬件系统小型化等优点,逐步取代早期的模拟脉压技术,是现代脉压技术的发展趋势。

In order to overcome the shortcoming of the time-domain correlation processing in classical PN-code fuze,the method of digital quadrature detection is proposed based on poly-phase filtering and digital pulse compression which are achieved by FPGA and DSP tools.The FPGA-DSP simulation results are indicated to be accurate according to the comparison with the results simulated by the MATLAB.Digital pulse compression technique will be the trend of modern pulse compression technique because of its stable performance,strong anti-interference ability,flexible control mode and miniaturized hardware system.