脉冲干扰对北斗B1I信号接收机影响

Effect of Pulse Interferences on Beidou B1I Signal Receiver

目前,脉冲发射型电子设备的广泛应用对导航接收机的可靠运行构成了一定威胁。为了有效评估脉冲干扰对北斗B1I信号接收机的影响,结合B1I信号谱特性,提出了一种新的干扰分类方法,导出了干扰条件下相关器输出功率的解析表达式,并分析了其对捕获、跟踪的影响。仿真结果表明:脉冲占空比和干扰功率越大,对接收机的不利影响越显著,然而,不同干扰类型下脉冲持续时间对接收机影响呈现一定差异,同时,载波频率误差与接收机接收性能呈正相关特性。可见针对B1I的结果与国内外GPS L1一致性良好,验证了导出模型的有效性。

At present,the prevailing application of pulse-emitting electronic devices has posed a threat to the reliable operation of navigation receivers to some extent.In order to evaluate the impact of pulse interference on Beidou B1I receivers effectively,a novel interference classification method was proposed and the analytical expressions of correlator output power under interference were derived in accordance with the spectral characteristic of B1I signal,its effect for acquisition and track were analyzed as well.The simulation results indicate that a greater duty cycle and interference power of pulse have a more adverse effect on receiver.However,the endurance time of pulse shows a variable tendency for different kinds of interference,the carrier frequency error also has a positive correlation trait with regard to reception performance of receivers.It is concluded that the results focused on B1I have a good agreement with GPS L1,which validates the effectiveness of the derived model.