基于Kay加权的高动态载波跟踪环路初始频差估计方法
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TN967

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河北省省级科技计划项目——新一代电子信息技术创新专项(项目编号:21310402D)


Initial frequency offset estimation method for high dynamic carrier tracking loop based on Kay weighting
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    摘要:

    在高动态环境下,导航接收机载波跟踪环路中存在较大的初始频率误差,当其大于跟踪环路牵入范围时会导致环路失锁或锁定错误频率。针对该问题的研究,已经有学者提出使用最大似然估计方法或增加跟踪环路阶数解决,但以上方法估计精度低,且鉴频范围小且计算复杂度高,在算法实现时资源消耗大。为解决上述问题,本文提出了一种基于Kay加权的载波跟踪环路初始频差估计方法,该算法首先对跟踪环路中IQ两路的短时积分结果进行二倍角处理,然后,再对其使用四象限反正切鉴频器鉴频,最后借鉴Kay算法对鉴频结果加权得到频差估计值。通过与传统方法做计算机仿真对比,结果表明在信噪比为-26 dB及以上时,在相同运算采样点数的前提下,本文方法估计精度相较于最大似然估计和三阶锁频辅助四阶锁相环路方法分别提升8.72 dB和19.59 dB或更高。在达到相同估计精度情况下,本文算法运算采样点数为最大似然估计方法的6.25%,算法计算量中加法与乘法次数仅为其1.7%和5.6%,计算时长为其1.56%。

    Abstract:

    In the high dynamic environment, there is a large initial frequency offset in the carrier tracking loop of the navigation receiver, and when it is larger than the pulling range of the tracking loop, the loop will lose lock or lock the wrong frequency. To solve this problem, some scholars have proposed to use maximum likelihood estimation method or increase the order of tracking loop to solve it. However, the above methods have low estimation accuracy, small frequency identification range and high computational complexity, and large resource consumption in the implementation. To solve the above problems, this paper proposes an initial frequency offset estimation method for carrier tracking loop based on Kay weighting. Firstly, the short-time integration results of IQ two channels in the tracking loop are processed by double Angle, and then, the frequency offset estimation is obtained by using four-quadrant arctangent frequency discriminator. Compared with the traditional method by computer simulation, the results show that the estimation accuracy of the proposed method is 8.72 dB and 19.59 dB higher than that of the maximum likelihood estimation and the third-order frequency-locked aided fourth-order phase-locked loop method respectively under the premise of the same number of operation sampling points when the signal-to-noise ratio is -26 dB or above. Under the condition of the same estimation accuracy, the number of sampling points of the method in this paper is 6.25% of that of the maximum likelihood estimation method, the number of addition and multiplication in computation of algorithm is only 1.7% and 5.6%, and the calculation time is 1.56%.

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王晓君,姚远. 基于Kay加权的高动态载波跟踪环路初始频差估计方法[J]. 科学技术与工程, 2023, 23(12): 5129-5135.
Wang Xiaojun, Yao Yuan. Initial frequency offset estimation method for high dynamic carrier tracking loop based on Kay weighting[J]. Science Technology and Engineering,2023,23(12):5129-5135.

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  • 收稿日期:2022-09-19
  • 最后修改日期:2023-02-16
  • 录用日期:2022-12-02
  • 在线发布日期: 2023-05-24
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