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中文摘要：
针对多普勒测量法恒幅恒频假设在脱靶量点附近会引起较大的测频误差的问题,提出了一种基于恒幅chirp信号假设的准实时标量脱靶量测量方法。通过延长多普勒频率的拟合分段时长,有效地增大了积累时间。利用分数阶傅里叶变换的快速离散算法来实现。仿真结果表明,相比基于FFT的方法,测量精度更高、鲁棒性更好,尤其是在较低信噪比的情况下,但计算复杂度略有增加。
英文摘要：
Since the hypothesis of constant amplitude and constant frequency, adopted by the conventional miss distance measurement method using Doppler information, leads to notable estimation error of Doppler frequency around the closest point approaching the target, a quasi real-time method of scalar miss distance measurement is proposed based on the assumption of constant amplitude chirp signal. Through increasing the fitted segment time used for Doppler frequency, the integration duration is prolonged effectively. What＇s more, the proposed method is realized via the fast discrete algorithm of the fractional Fourier transform. The simulation results show that, compared with the real-time method of scalar miss distance measurement based on the FFT, this method can obtain higher accuracy and better robustness, particularly when the signal-noise-ratio is low relatively. However, the computation complexity rises slightly.
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