JTIDS系统中两种下变频方法的性能仿真  

Performance Simulation of Two Kinds of Down-Conversion Methods for JTIDS

作　　者：布刚刚 

机构地区：[1]中国电子科技集团公司第二十研究所,西安710068

出　　处：《现代导航》2017年第1期23-27,共5页Modern Navigation

摘　　要：JTIDS波形采用扩频机制进行系统同步,并采用多进制扩频和MSK调制方式传输信息。针对这种特点,JTIDS波形在接收端一般采用匹配相关取相关峰位置的方法来同步和解调。一种方式是将AD(模数转换采样)下变频滤波后的IQ数据直接进行匹配相关;另一种是对AD采样数据只取符号位后进行下变频滤波再进行匹配相关。本文对两种方法的性能进行了分析比较。The spread of JTIDS waveform is used to synchronize the system, and the information is transmitted by M-ary spread spectrum and MSK modulation. According to this characteristic, the JTIDS waveform is used to match the correlation peak position in the receiver. One way is to directly convert the IQ data of the AD filter into the matching correlation, and the other is to carry out the correlation of the AD sampling data only after the symbol bit is converted to the lower frequency. In this paper, the performances of the two methods are compared.

关 键 词：联合战术信息分发系统 下变频 匹配相关 

分 类 号：TN914[电子电信—通信与信息系统]