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中文摘要：
提出一种基于STFRFT的无源雷达目标时延与多普勒联合估计新方法。首先，给出了一种STFRFT时频分辨率量化方法及其数学表达式；其次，利用STFRFT的投影包络对回波信号时延与Doppler频移进行了联合估计；最后，讨论分析了脉内信噪比、高斯窗参数等对所提方法估计性能的影响。仿真结果表明，与CAF方法相比，所提方法更容易获得高精度的时延与Doppler频移的联合估计，具有更高的可靠性。
英文摘要：
A novel method of joint estimation of time delay and Doppler shift in passive radar system based on short-time fractional Fourier transform （STFRFT） was proposed. Firstly, the mathematical expression of the STFRFT time-frequency resolution was studied for the quantitative comparison. Secondly, based on the projection envelops of STFRFT, a new method to estimate the time delay and Doppler shift was put forward. Finally, the factors related with the estimation precision such as signal-to-noise ratio （SNR）, parameters of Gaussian window were analyzed. The simulation results demonstrate that compared with the CAF based method, proposed method can get precise time delay and Doppler shift estimations with higher probability.
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