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利用导航信号收发已知且具有周期性的特点,提出了一种对着陆引导信号多径时延进行有效估计的方法。该方法首先计算相关函数,而后对相关函数进行二次微分,对时延值进行初步估计。最后通过直线拟合算法和比例拟合算法提高估计精度。通过计算机仿真,验证了算法的有效性。该算法具有在低采样率的条件下,估计精度高的特点。
According to the known and cyclical characteristics of the transmission and reception of navigation signals, a method of effectively estimating the multipath delay of landing pilot signals is proposed. The method first calculates the correlation function, and then the second derivative of the correlation function, preliminary estimates of the delay value. Finally, the accuracy of estimation is improved by using straight-line fitting algorithm and proportional fitting algorithm. Through computer simulation, the validity of the algorithm is verified. The algorithm has the characteristics of high estimation accuracy under the condition of low sampling rate.