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Conference Paper
GPS L5 신호에 대한 Floating 및 Fixed 레벨 신호획득부 알고리즘
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- Issue Date
- 2009-09
- Citation
- 한국 자동 제어 학술 회의 (KACC) 2009, pp.1083-1087
- Publisher
- 제어·로봇·시스템학회
- Language
- Korean
- Type
- Conference Paper
- Abstract
- This paper proposes a design and performance of the signal acquisition algorithm for GPS L5 signal. The L5 signal has an in-phase component(I5) and a quadrature component(Q5). The signal acquisition algorithm is usually done based on the serial search, the multiple correlator and Matched Filter method, and FFT(or DFT). In this paper, we use FFT-IFFT(or DFT-IDFT) algorithm only considering Q5 pilot channel. The FFT size of this algorithm is 65536. This FFT size needs the 3ms sampled data and 1ms code sampled data. And this FFT size is designed to effectively remove correlation loss for bit transition of secondary code(NH20). We uses down sampling for input signal and oversampling for GPS L5 code. These sampled data can reduce the acquisition complexity. In this paper, we truncate bit level for fixed level acquisition algorithm after implementing the floating level acquisition. Simulation results of the proposed floating and fixed level techniques are provided to demonstrate the acquisition performance.
- KSP Keywords
- Correlation loss, Down-sampling, FFT-IFFT, Filter method, In-phase, Phase component, Pilot channel, Signal Acquisition, acquisition algorithm, acquisition performance, bit transition