一種脈沖超寬帶測控信號捕獲方法

廉昕; 王元?dú)J; 侯孝民; 孟祥利

doi:10.11999/JEIT161213

一種脈沖超寬帶測控信號捕獲方法

doi: 10.11999/JEIT161213

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出版歷程
- 收稿日期: 2016-11-09
- 修回日期: 2017-02-08
- 刊出日期: 2017-08-19

Acquisition Scheme for Impulse Radio UWB TTC Signal

摘要

摘要: 脈沖超寬帶測控系統(tǒng)作為一種航天測控新體制，可有效提高系統(tǒng)的隱蔽性和抗干擾性。該文針對脈沖超寬帶測控信號的捕獲問題，提出利用基于部分匹配濾波與快速傅里葉變換(Partial Matched Filtering and Fast Fourier Transform, PMF-FFT)的捕獲方法完成對脈沖相位、偽碼相位和多普勒頻率的3維捕獲。又針對搜索空間大、捕獲時(shí)間長和多普勒頻率估計(jì)精度低的問題，提出了一種改進(jìn)的捕獲方法。該方法采用兩步捕獲法對時(shí)延相位進(jìn)行捕獲，同時(shí)利用修正的Rife算法對多普勒頻率進(jìn)行進(jìn)一步精細(xì)估計(jì)。仿真結(jié)果表明，該方法可有效提高捕獲速度，減小捕獲時(shí)間，且能顯著提高多普勒頻率估計(jì)精度。
- 脈沖超寬帶 /
- 測控 /
- 捕獲 /
- 多普勒頻率 /
- Rife算法
Abstract: The impulse radio Ultra-WideBand (UWB) Tracking, Telemetry, and Command (TTC) system is a new kind of TTC system that can greatly improve the concealment and anti-interference performance. To solve the acquisition problem of the impulse radio UWB TTC signal, an acquisition scheme based on Partial Matched Filtering and Fast Fourier Transform (PMF-FFT) is proposed to accomplish the three-dimensional acquisition of pulse phase, pseudorandom code phase and Doppler frequency simultaneously. Then, according to the problem of excessive search space, long acquisition time and low estimation accuracy of Doppler frequency, a new improved acquisition scheme is proposed. It adopts the two-step scheme to accomplish time delay phase acquisition, and uses the modified Rife algorithm to further estimate the Doppler frequency. Simulation results show that this scheme can effectively improve the acquisition speed, reduce the acquisition time, and greatly improve the estimation accuracy of Doppler frequency.
- Impulse radio UWB /
- Tracking, Telemetry, and Command (TTC) /
- Acquisition /
- Doppler frequency /
- Rife algorithm

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