针对传统的线性频率调制(LFM)波和频移键控(FSK)波体制的车载雷达系统存在的一些问题,提出了一种LFM和FSK结合的多频移键控(MFSK)波形雷达测量方法。首先,理论推导出了MFSK体制的测量原理,采用了全相位FFT(apFFT)算法来提高相位估计精度;然后,结合该算法设计出了系统信号处理方法,并对系统的性能进行对比分析。仿真结果表明:文中所设计的MFSK车载雷达系统在多目标情况下具有很高的测量分辨率、可以实现无模糊测量、有效避免虚假目标出现等优点,满足车载雷达测量系统对各项性能的要求。

In view of the questions that traditional linear frequency modulated (LFM) continuous wave and frequency shift keying (FSK) wave are existing in automobile radar system, a multiple frequency shift keying wave(MFSK) radar measurement method combined with LFM and FSK wave is discussed in this paper. Firstly, the measurement principle of MFSK system is deduced theoretically, then all phase FFT (apFFT) algorithm is used to improve the phase estimation accuracy. The system signal processing method is designed by apFFT algorithm, then the performance of the system is compared and analyzed. Simulation results show that the designed MFSK automobile radar system has high measurement resolution, it could measure unambiguously and avoid any ghost target situation. In a word, the performance of this algorithm could meet the requirements of automobile radar measurement system.

TN957.51