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以正交四元探测系统为例,介绍了多元红外导引头的工作原理。为了有效设计多元红外导引头预处理电路带宽,利用Matlab进行仿真,通过仿真分析了预处理电路高端和低端带宽的选择对信号提取的影响,并研究了预处理带宽选择对抗人工干扰的影响。仿真结果表明,频带低端设置对信号下沉有较大影响,频带高端设置对脉冲下降沿产生的负脉冲有较大影响。在对抗大倍数人工诱饵干扰时,电路的低端带宽选择会对抗干扰带来显著影响。最后利用仿真结果,设计了红外四元导引头的预处理电路,经内外场测试,该电路在目标脉冲信号提取及抗人工干扰性能方面表现出了良好的性能。
Taking orthogonal quaternion detection system as an example, the working principle of multivariate infrared seeker is introduced. In order to effectively design the bandwidth of the preprocessing circuit of multivariate infrared seeker, the simulation was carried out by Matlab, and the influence of the selection of high and low bandwidths on signal extraction was analyzed by simulation. The effect of preprocessing bandwidth selection on the interference was also studied . The simulation results show that the setting of the lower end of the band has a greater impact on the signal sinking and the setting of the upper end of the band has a greater impact on the negative pulse generated on the falling edge of the pulse. When confronted with large artificial bait interference, the low-end bandwidth options of the circuit can have a significant impact on interference rejection. Finally, the simulation results are used to design a preprocessing circuit of the infrared four-element seeker. The internal and external field tests show that the circuit has good performance in the target pulse signal extraction and anti-jamming performance.