FMCW雷达系统的双模方向判断模块研究

Research on dual mode direction judging module in FMCW radar system

方向判断模块是雷达防撞系统中的一个重要功能模块。为实现该模块,完成了对差频信号频率及相位与目标运动方向关系的理论推导,得到并验证了频率及相位与目标靠近或远离关系的2种判定法则。利用这2种法则,设计了基于频率和相位变化判断目标运动方向的双模判断模块。该模块集成了2种模式的方向判断电路,连接计频器得到用于DSP计算的频率,并利用光电报警器直观显示目标的运动方向,可极大地提高方向判断的准确性。对电路的模拟结果验证了利用双模理论实现方向判断模块设计的可行性。

The direction judging module is an important functional portion in radar collision-avoidable system. To realize this module, the theoretical derivation of difference frequency, as well as phase to object-moving direction, is firstly performed. The relationships of frequency-direction and phase-direction are successfully established. Based on these two rules, a dual mode object-moving direction judging module is designed, which integrates two direction judging circuits and frequency counter, and the moving direction result can be displayed by photoelectric alarm. The presented module can improve the direction judging accuracy. And furthermore, the simulations of circuits validate the feasibility to realize the hardware module using dual mode rules.