雷达回波信号的多普勒瞬时频率仿真研究

Doppler Instantaneous Frequency Simulation of Radar Echo Signal

雷达回波信号是非平稳的时变信号,其瞬时频率是雷达接收机所接收到的回波信号的重要参数,可以获知空间目标的运动信息。本文分析了雷达回波信号处理过程中产生的多普勒瞬时频率的数学基础,其信号频谱峰值随时间的变化而变化,并采用时频分析的方法仿真了多普勒瞬时频率的性能参数,以获得回波信号的多普勒瞬时频率时间域与频率域的联合分布信息,便于获知空间目标的运动情况,更好地探测、跟踪空间运动目标。

The radar echo signal is a non-stationary time-variable signal, and its instantaneous frequency is an important parameter in the echo signal received by radar receiver, by which the moving information of the target can be obtained in space. Its mathematical basis is analyzed with respect to Doppler instantaneous frequency in the radar echo signal processing. Its signal frequency spectrum peak value changes with time variation. The performance parameter of the Doppler instantaneous frequency is simulated by the time-frequency analysis method, the associated distribution information in the time domain and frequency domain is obtained, which can easily be used to catch the moving data of target in space, and therefore, to detect and track the moving target in space.