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为了扩展利用Chirp脉冲测距的灵活性和适用性,基于分数阶傅里叶变换特点,提出了一种运算量更小且更具扩展性的Chirp脉冲测距新方法,并导出了其离散距离估计子的解析表达式。分析了该距离估计子的离散精度和多目标分辨力,考察了多普勒频移所引起的测距误差,并对比了本文方法与脉冲压缩方法的主要性能参数。研究结果表明:本文方法在大时宽带宽积条件下具有与脉冲压缩方法相比拟的性能,且运算量约减少一半。最后,仿真验证了理论推导的正确性。
In order to extend the flexibility and applicability of using Chirp pulse distance measurement, a new method based on Fractional Fourier Transform (FOURIER TRANSFORM) is proposed to reduce the computational complexity and extend the Chirp pulse distance, and its discrete distance Estimated sub-expression. The discreteness and multi-target resolution of the distance estimator are analyzed. The ranging errors caused by Doppler shift are investigated. The main performance parameters of the method and the pulse compression method are compared. The results show that the proposed method has better performance than the pulse compression method under the condition of wide bandwidth product and the computational complexity is reduced by about half. Finally, the simulation verifies the correctness of the theoretical derivation.