New Adaptive All-pass Based Notch Filter for Narrowband/FM Anti-jamming GPS Receivers |
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Authors: | Wei-Lung Mao Wann-Jiun Ma Ying-Ren Chien Chia-Hao Ku |
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Affiliation: | 1. Department of Electronic Engineering, National Formosa University, No. 64, Wunhua Road, Huwei Township, 63210, Yunlin County, Taiwan, ROC 2. Department of Electrical Engineering, National Taiwan University, Taipei, 10617, Taiwan, ROC 3. Integrated Logistical Support Center, Chung-Shan Institute of Science and Technology, Taoyuan, Taiwan, ROC 4. Department of Electrical Engineering, Mingchi University of Technology, Taipei, Taiwan, ROC
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Abstract: | The global positioning system (GPS), which provides accurate positioning and timing information, has become a commonly used
navigation instrument for many applications. The application of a new adaptive all-pass based notch filter (ANFA) for narrowband/FM
interference suppression and frequency estimation in GPS receivers is proposed. An ANFA structure that achieves better unbiased
characteristics with its coefficients is employed to accurately estimate the narrowband interfering signals in online fashion.
A variable convergence factor that optimizes the maximal mean square error (MSE) reduction in each iteration is applied in
a modified adaptive Gaussian–Newton (MAGN) algorithm. The proposed MAGN algorithm can lead to both faster convergence speed
and higher estimation accuracy. Simulation results show that the ANFA offers a better performance than conventional linear
predictors in terms of the SNR improvement and the mean output power (MOP) under the interference environments of interest. |
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