| 引用本文: | 李柏渝,唐小妹,王耀鼎,等.新体制导航信号下I/Q幅相不一致对接收机测距零值的影响分析.[J].国防科技大学学报,2019,41(1):65-71.[点击复制] |
| LI Baiyu,TANG Xiaomei,WANG Yaoding,et al.Analysis of the influence on zero value in receivers under I/Q amplitude and phase imbalance with new structure navigation signals[J].Journal of National University of Defense Technology,2019,41(1):65-71[点击复制] |
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| 新体制导航信号下I/Q幅相不一致对接收机测距零值的影响分析 |
| 李柏渝, 唐小妹, 王耀鼎, 刘哲 |
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(国防科技大学 电子科学学院， 湖南 长沙 410073)
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| 摘要: |
| 随着现代化导航信号带宽的增大，由于可以大幅降低采样率，复信号采样的优势日趋明显。由于存在I/Q幅相误差，复信号采样对导航接收机伪距测量造成了一定影响。改进了信道非理想与I/Q幅相误差共同影响BPSK/QPSK信号零值测量的分析模型；在该模型基础上，推导得到了任意I/Q误差和信道非理想特性影响BOC信号伪距零值的模型；探讨了二者在频域抗干扰应用场景下引起的零值变化；理论分析与软件接收机仿真结果高度吻合，误差在1.5×10-4码片内，证明了分析模型的精确性。该分析方法可用于对高性能导航接收机信道特性进行事先约束及筛选，以确保干扰场景下的零值变化满足要求。 |
| 关键词: 导航接收机 非理想信道 I/Q 幅相误差 零值 |
| DOI：10.11887/j.cn.201901010 |
| 投稿日期：2017-11-22 |
| 基金项目:国家自然科学基金资助项目（61601485） |
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| Analysis of the influence on zero value in receivers under I/Q amplitude and phase imbalance with new structure navigation signals |
| LI Baiyu, TANG Xiaomei, WANG Yaoding, LIU Zhe |
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(College of Electronic Science, National University of Defense Technology, Changsha 410073, China)
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| Abstract: |
| Since the bandwidth of modernized navigation signal is increasing, the advantages of complex signal sampling have a raising benefit by substantially reducing the sampling rate. Because of the I/Q amplitude and phase response imbalance, the complex signal sampling may introduce error to the pseudo range measurement in the navigation receivers. The analysis model explaining the influence of the non-ideal characteristic of signal channel, I/Q amplitude and phase response imbalance on the zero value measurement in BPSK/QPSK navigation receivers were improved. Based on the model, the pseudo range zero value of BOC signal affected by I/Q imbalance and the non ideal characteristic of signal channel was derived. The zero value shift caused by the two factors in the frequency domain anti-jamming processing was discussed. The proposed theoretical analysis is highly close to the simulation result in software receivers, where the error is within 1.5×10-4 chip. This result proves the accuracy of the analysis model. The proposed analysis method can be used to provide prior constraint for features of analog channel in high performance navigation receivers, which can meet the requirement of the zero value change in the jamming scenario. |
| Keywords: navigation receiver non-ideal channel I/Q amplitude and phase response errors zero value |
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