一种大测距动态范围高重频相干测距测速激光雷达(Ⅰ):体制及性能

A coherent range and range-rate detection ladar with large ranging dynamic range and high-repetition-rate(Ⅰ) :Mechanism and performance

分析了简单"对称三角线性调频(STLFM)"连续波测距测速激光雷达体制及其局限性,提出了"双本振"、"双调制双本振"、"双频双调制双本振"相干激光雷达体制,不同程度提升了简单STLFM体制激光雷达的测距动态范围及探测重复频率等性能.对三种体制中涉及到的关键理论进行了仿真分析,对探测精度进行了分析并提出了进一步提高测距精度的措施,仿真分析了采用脉冲积累降低对发射功率需求的能力.几种体制对比表明"双频双调制双本振"对称三角线性调频连续波测距测速激光雷达体制具有大测距动态范围、高探测重频、能有效降低对发射功率的需求等优点.

The simple symmetrical triangular linear frequency modulation （STLFM） continuous wave range and rangerate detection ladar system and its limitations were analyzed.Dual-LO,dual-modulation dual-LO,dual-frequency dualmodulation dual-LO coherent ladar systems were proposed,which will enhance the simple STLFM system＇s dynamic range of detection range,the detection repetition frequency,and other performances of this system.The simulation and analysis of the key theory for these three systems and the detection accuracy were presented.Methods for further improving the ranging accuracy were proposed.The possibility to reduce the need of emitted power by pulse integration was simulated and analyzed.Comparison of those systems demonstrated that dual-frequency dual-modulation dual LO symmetrical triangular linear frequency modulation continuous wave range and range-rate detection ladar system has advantages of large dynamic range of ranging,high-repetition-rate of detection,effective ability of reduce the need of emitted power and so on.