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中文摘要：
对短时相关和FFT相结合的伪码快速捕获算法进行了研究，分析了在预检测积分时间固定的情况下短时相关时间和FFT点数对系统增益的影响。存在多普勒频移时，提出采用平均增益和平均发现概率来衡量系统性能的分析方法，并以平均增益最大为准则，数值计算得到短时相关时间和FFT点数的最优组合。仿真结果表明，在固定多普勒频移范围的情况下，最优组合使得系统性能逼近没有多普勒频移时的最佳性能。
英文摘要：
An algorithm for rapid PN code acquisition based on combined short time correlation and FFT is studied in detail. The correlation time effect and FFT window size effect on the system gain are analyzed in theory when the pre-detection integration time is fixed. A novel method to measure the system performance is proposed in terms of mean system gain and mean detection probability. Also, the principle based on the maximum mean gain criteria is presented for selecting the optimal combination of the FFT size and window size of short time correlation Simulation shows that even with the Doppler shift, the system performance with the optimal combination approaches the optimal performance without the Doppler shift.
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