一种改善GNSS弱信号动态跟踪性能的FFT鉴频方法

doi:10.7527/S1000-6893.2018.21932

Abstract

Abstract: The GNSS weak signal tracking technology based on the FFT frequency discriminator can effectively improve pedestrian navigation in urban canyon environment; however, the weak signal tracking ability of existing Complex Squared FFT (SFFT) discriminators would be greatly reduced in vehicles and other high dynamic applications. On the premise of ensuring the sensitivity of weak signal tracking, a Non-Coherent FFT (NonCoh-FFT) frequency discrimination is proposed, which can significantly improve dynamic performance. First, the structure principle of the existing SFFT frequency discriminator and the proposed NonCoh-FFT frequency discriminator are analyzed. Then, the sensitivity and dynamic performance of the two discriminators are analyzed theoretically. Finally, based on the static and dynamic scenes of the GNSS signal simulator, the SFFT and NonCoh-FFT are compared and tested. The results show that the NonCoh-FFT can obviously improve the dynamic performance of the GNSS weak signal, which is consistent with the conclusion of theoretical analysis.

Key words: GNSS weak signal, FFT frequency discriminator, non-coherent integration, sensitivity, dynamic

CLC Number:

QI Farui, ZHANG Tisheng, LI Zhuo, TANG Hailiang. A FFT frequency discriminator for improving the dynamic tracking performance of GNSS weak signal[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2018, 39(8): 321932-321932.

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A FFT frequency discriminator for improving the dynamic tracking performance of GNSS weak signal

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