多普勒对空引信回波分析及碰炸优先判决准则研究

现有的二维弹目交会模型很难准确对对空引信回波信号进行模拟,为准确给出多普勒对空引信"碰炸优先"的判决准则,采用一种三维弹目交会模型对引信回波信号建模,推导出回波信号的表达式。采用短时分数阶傅里叶变换对三维交会模型中碰炸(包括迎击、追击和不共线交会)和近炸(包括早到、晚到和目标机动)共两类6种情形进行分析,得出了脉冲多普勒对空引信碰炸和近炸自适应判决准则。通过Matlab仿真结果验证了该分析模型和判决准则的准确性。

Research on Modeling and Simulation of Echo Signal of Pulse Doppler Fuze and Judgment Criterion of Its Impact

The existing two-dimensional missile-target encounter model is difficult to simulate accurately the echo signal of fuze for attack. In order to accurately give a judgment criterion for “impact priority” of pulse Doppler fuze, a three-dimensional missile-target engagement model is used to establish fuze echo model, and the mathematical formula of echo signal is derived. The short-time fractional Fourier transform is used to analyze the impact and proximity bursts in the three-dimensional missile-target engagement model. The judgment criteria for pulse Doppler fuze to adaptively select impact function or proximity function are obtained. Matlab simulation results are usedverify the accuracy of the analytical model and the judgment criterion.