| 摘要: |
| 遥测测距技术采用再生伪码作为上行链路信号。针对飞行器现有码跟踪环结构复杂、低信噪比条件下环路跟踪性能差的问题，提出了一种新的基于锁相环的码跟踪环结构，推导了环路的信号处理流程。该结构降低了环路实现的复杂度，改善了低信噪比条件下的相位测量精度，仿真进一步验证了方法的有效性和稳定性，较现有方法在信噪比为-10 dB时能提高1.5×10－3个码片的精度，适合遥测测距技术。 |
| 关键词: 遥测测距 码跟踪环 PN码相位 |
| DOI： |
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| 基金项目:北京市科技重大专项（Z181100002918004） |
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| A New Code Tracking Loop Suitable for Telemetry Ranging Signals |
| HOU Yanbing,JIAO Yiwen,YANG Wenge |
| (Department of Optical and Electronics Engineering,Aerospace Engineering University,Beijing 101416,China) |
| Abstract: |
| The telemetry ranging technique uses regenerated pseudo code as its uplink signal.To solve the problems of complex structure of the existing code tracking loop of the aircraft and squaring loss of loop tracking under low signal-to-noise ratio(SNR) conditions,this paper proposes a new code tracking loop structure based on phase-locked loop(PLL) and derives the signal processing formula of the loop.The new structure reduces the complexity of the loop implementation,with no square loss,and ensures the accuracy of the phase measurement.Finally,simulation is conducted to verify the validity and stability of the method.The results show that the proposed method can improve the accuracy of 1.5×10－3 chip compared with the existing method when the SNR is -10 dB.This provides suitability proof for using the new code tracking loop in telemetry ranging technology. |
| Key words: telemetry ranging code tracking loop PN code phase |
《电讯技术》编辑部 