对JTIDS的多音扫频干扰的研究

Study on multi-tone frequency sweeping jamming of JTIDS

联合战术信息分发系统(JTIDS)采用跳频、直接序列扩频以及信道编码技术,具有很强的抗干扰能力。使用多音干扰时,需要考虑干扰频率与JTIDS载波频率的频率偏差问题,而使用多音扫频干扰时,只需要设定一个扫频带宽,在JTIDS载波频率附近反复扫描干扰此带宽即可。在JTIDS数据链路模型中加入了三种不同扫频方式的多音扫频干扰进行仿真,并与多音干扰进行对比。仿真结果表明,三种多音扫频干扰的误码率明显大于多音干扰。加入多音干扰时,干扰频率与JTIDS载波频率的频率偏差为1.2MHz时的误码率最大,加入多音扫频干扰时,扫频带宽为0.6MHz到0.8MHz时的误码率最大,而且干扰的效果还与扫频方式有关。

Joint tactical information distribution system （JTIDS） uses frequency hopping, direct sequence spread spectrum and channel coding technology, with strong anti-jamming capability. When multi-tone jamming is used into JTIDS, it needs to consider the offset of jamming frequency and carrier frequency of JTIDS, but when multi-tone frequency sweeping jammingis used into JTIDS, it only needs to set a sweep bandwidth, sweeping and jamming itrepeatedly in the vicinity of the carrier frequency of JTIDS. Three differentmulti-tone jamming of frequency sweeping methods are added to data link model of JTIDS to simulate, and compared with multi-tone jamming. The simulation results show that, the bit error rate of multi-tone frequency sweeping jamming is obviously higher than multi-tone jamming. When multi-tone jamming is used into JTIDS, if the offset of jamming frequency and carrier frequency of JTIDS is 1.2MHz, the bit error rate reaches the maximum value. When multi-tone frequency sweeping jammingis used into JTIDS,if the sweep bandwidth is between 0.6MHz and 0.8MHz, the bit error rate reaches the maximum value, and the jamming effectis also related with sweep method.