基于对称三角线性调频的单脉冲测速算法

Velocity Estimation Using Symmetrical LFM Monopulse

随着冲压发动机的快速发展,超高音速巡航成为可能。由于超高音速目标飞行速度极快,机动性大大提高,现有雷达难以对其进行有效的跟踪。为了应对来自超高音速目标的威胁,快速提取目标速度信息,帮助改善跟踪性能就显得尤为重要。首先给出了适用于超高音速目标的回波模型,提出了基于对称三角线性调频信号的超高音速目标单脉冲测速算法,该算法利用线性调频信号的距离多普勒耦合现象实现单脉冲测速。仿真结果表明,在信噪比较大的情况下,该算法取得了较好的测速效果,且对信噪比的依赖相对于双通道匹配滤波峰值输出测速模型有明显的降低。

With the rapid development of ramjet,hypersonic cruise has become true.As a result of hypersonic flight,target＇s maneuverability gets stronger and the modern radar will disable to track it efficiently.In order to cope with the threats from hypersonic targets,fast velocity extraction for improving tracking performance is extremely important.Firstly,the echo models of hypersonic targets are analyzed,and then a new velocity estimation method using symmetrical triangle LFM monopulse is proposed.Due to the LFM pulse＇s range-doppler coupling property,monopulse velocity measurement is implemented.Using numerical simulations,we demonstrate that under high SNR condition the method gets acceptable velocity estimation result,and its dependence on SNR is distinctly decreased in comparison with the dual channel matched filter peak output method.