基于CVSD编码的超短波电台抗干扰性能研究

Anti-interference Performance of UHF Radio based on CVSD Coding

采用Simulink软件搭建了CVSD编码仿真模型,研究了CVSD在话音频段的编码特性。结合CVSD编码在超短波电台中的实际应用,指出了压缩电路的性能改善作用。搭建跳频和跳扩通信系统的仿真模型,采用多音、跟踪和部分频带三种典型干扰,仿真研究电台在跳频模式下采用CVSD、PCM编码和在跳频、跳扩模式下采用CVSD编码的抗干扰能力,并通过计算失真度进行比较。结果显示,跳扩系统对抗部分频带和跟踪干扰的能力优于跳频系统,而对抗多音干扰的能力则弱于跳频系统。

CVSD coding simulation model is built up with Simulink, and CVSD coding characteristics in audio frequency range are discussed. Combined with the practical application of CVSD coding in ultra- short wave radio, the performance improvement of the compression circuit is pointed out. Simulation models of FH and DS/FH communication systems are built up, and the three typical interferences of multi-tone, tracking and partial frequency bands adopted. The anti-interference performance of the system with CVSD, PCM coding in FH mode and CVSD coding in FH, DS/FH mode is discussed. And some useful conclusions are drawn from the comparison of distortion in different simulations. The results indicate that the ability of DS/FH system in countering the partial frequency band and tracking interference is better than that of FH system, while the ability to resist the multi-tone interference is weaker than that of FH system.