GPS L1頻點授權信號質量評估

康立; 盧曉春; 王雪; 賀成艷; 饒永南; 楊德進

doi:10.11999/JEIT170440

GPS L1頻點授權信號質量評估

doi: 10.11999/JEIT170440

基金項目:

國家自然科學基金(61501430)，中國科學院青年創(chuàng)新促進會基金

計量
- 文章訪問數(shù): 1843
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- 被引次數(shù): 0
出版歷程
- 收稿日期: 2017-05-11
- 修回日期: 2017-12-27
- 刊出日期: 2018-04-19

Authorized Signals Quality Assessment on GPS L1

Funds:

The National Natural Science Foundation of China (61501430), The Youth Innovation Promotion Association Foundation of Chinese Academy of Sciences

摘要

摘要: GNSS信號的空間信號(SIS)質量直接影響用戶的定位、測試和授時(Positioning, Velocity and Timing, PVT)服務精度，但由于授權信號保密等原因，授權信號的偽碼序列未知，衛(wèi)星導航系統(tǒng)授權信號質量評估存在一定的困難性。該文主要分析GPS BIIF-5衛(wèi)星L1頻點的相干自適應副載波調制(CASM)信號，利用匹配濾波理論恢復出采集數(shù)據(jù)中的P(Y)碼和M碼兩個授權信號分量的偽碼符號，采用極大似然估計結合信號分布特點準確求解出各信號分量之間的功率分配。重點分析P(Y)碼和M碼信號相關性能，包含相關曲線、相關損失和S曲線過零點偏差(S-Curve bias)，定量地評估了授權信號的空間信號質量。提出完整的基于GPS L1頻點授權信號質量評估方法，研究成果可作為其他衛(wèi)星導航系統(tǒng)授權信號質量評估的參考。
- 授權信號質量評估 /
- 偽碼序列估計 /
- 功率分配 /
- 相關性能
Abstract: The quality of Signal-In-Space (SIS) for Global Navigation Satellite System (GNSS) is directly linked to users Positioning, Velocity and Timing (PVT) service. Limited to the insensitivity of authorized signals, the pseudo codes can not be obtained, so it is difficult to assess the authorized signal quality. This paper mainly focus on analyzing the Coherent Adaptive Subcarrier Modulation (CASM) signal on L1 frequency points for GPS BIIF-5 satellite and the code sequences of P(Y) and M signal are resumed by using matched filtering technology. The power distribution of each signal component can be solved through the maximum likelihood estimation theory combined with the signal characteristics. This paper laies special stress on quantitatively analyzing the correlation performance on P(Y) and M signals, including correlation curve, correlation loss and S-curve biases. Based on this complete authorized signals quality assessment method for GPS L1, the research productions can be reference to other satellite navigation systems authorized signals.
- Authorized signals quality assessment /
- Pseudo codes sequence estimation /
- Power distributions /
- Correlation performance

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