Carrier Tracking Loop using the Adaptive Two-Stage Kalman Filter for High Dynamic Situations
Carrier Tracking Loop using the Adaptive Two-Stage Kalman Filter for High Dynamic Situations
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DOI：
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发表时间：
2008-12
影响因子：
3.2
通讯作者：
Kwang-Hoon Kim;G. Jee;Jong-Hwa Song
中科院分区：
文献类型：
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作者：
Kwang-Hoon Kim;G. Jee;Jong-Hwa Song
在高动态情况下，GPS载波跟踪环路需要宽带宽来跟踪载波信号，因为多普勒频率随时间变化更快。然而，较宽的带宽允许跟踪环路的带宽内的噪声通过环路滤波器。由于这些噪声被用于数控振荡器（NCO）中，GPS接收机的载波跟踪环路在高动态情况下表现出劣化的性能。为了解决这个问题，可以使用自适应两级卡尔曼滤波器，其为NCO提供噪声较小的相位误差。该滤波器基于载波相位动态模型，能够适应动态模型不完整和多普勒频率快速变化的情况。所提出的跟踪环的性能进行了验证，通过几个仿真。
In high dynamic situations, the GPS carrier tracking loop requires a wide bandwidth to track a carrier signal because the Doppler frequency changes more rapidly with time. However, a wide bandwidth allows noises within the bandwidth of the tracking loop to pass through the loop filter. As these noises are used in the numerical controlled oscillator (NCO), the carrier tracking loop of a GPS receiver shows a degraded performance in high dynamic situations. To solve this problem, an adaptive two-stage Kalman filter, which offers the NCO a less noisy phase error, can be used. This filter is based on a carrier phase dynamic model and can adapt to an incomplete dynamic model and a quickly changed Doppler frequency. The performance of the proposed tracking loop is verified by several simulations.