Non-data-aided Extended Kalman Filter Based Carrier Tracking Loop in High Dynamic Environment
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摘要: 针对高动态及低信噪比情况下的GPS载波跟踪问题，该文提出一种无数据辅助情况下基于扩展Kalman滤波的载波跟踪环。该环路通过直接判决去掉调制信息，并利用去掉调制信息后的积分-清零滤波器输出直接作为扩展Kalman滤波的观测向量，以避免引入鉴相器而使环路在低信噪比情况下工作时受到限制。仿真结果表明，相比较于三阶锁相环，及利用鉴相器辅助的线性Kalman滤波载波跟踪环路，该文提出的环路具有更低的失锁概率及更小的相位跟踪误差。Abstract: This paper proposes a new carrier tracking loop based on Extended Kalman Filter (EKF) with no data aided in low Signal-to-Noise Ratio (SNR) and high dynamic environment. It utilizes the outputs of accumulator after symbol decision as the observation matrix of EKF. With this method, the restriction generated by using discriminators in low SNR can be avoided. The simulations show that the structure proposed has excellent characteristics compared with Phase Lock Loop (PLL) and linear Kalman Filter (KF) assisted with phase discriminator.
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