電離層非相干散射譜和自相關(guān)函數(shù)估計算法

李林; 韓承姣; 丁宗華; 姬紅兵; 王亞杰

doi:10.11999/JEIT180331

電離層非相干散射譜和自相關(guān)函數(shù)估計算法

doi: 10.11999/JEIT180331

1.
西安電子科技大學(xué)電子工程學(xué)院 ??西安 ??710071
2.
中國電波傳播研究所 ??青島 ??266107

基金項目: 電波環(huán)境特性及?；夹g(shù)重點實驗室開放基金(201500015)

詳細(xì)信息

作者簡介:
李林：男，1980年生，博士，副教授，研究方向為雷達(dá)信號處理、信號檢測與估值

韓承姣：女，1994年生，碩士生，研究方向為雷達(dá)信號處理

丁宗華：男，1978年生，博士，高級工程師，研究方向為非相干散射雷達(dá)探測技術(shù)

姬紅兵：男，1963年生，博士，教授，研究方向為雷達(dá)信號處理、目標(biāo)檢測與跟蹤

通訊作者:
李林　lilin@xidian.edu.cn

中圖分類號: TN958
計量
- 文章訪問數(shù): 1850
- HTML全文瀏覽量: 985
- PDF下載量: 59
- 被引次數(shù): 0
出版歷程
- 收稿日期: 2018-04-11
- 修回日期: 2018-08-31
- 網(wǎng)絡(luò)出版日期: 2018-09-13
- 刊出日期: 2019-02-01

Estimation of Ionospheric Incoherent Scatter Spectrum and Autocorrelation Function

1.
School of Electronic Engineering, Xidian University, Xi’an 710071, China
2.
China Research Institute of Radiowave Propagation, Qingdao 266107, China

Funds: The Key Laboratory of Radio Wave Environmental Characteristics and Modeling Technology Open Fund (201500015)

摘要

摘要:
非相干散射譜對電離層各物理參數(shù)的研究具有至關(guān)重要的作用?，F(xiàn)有非相干散射譜模型推導(dǎo)和計算較為復(fù)雜，且無法給出相應(yīng)的自相關(guān)函數(shù)模型。該文重新推導(dǎo)了電離層非相干譜的簡化模型，并提出相應(yīng)的自相關(guān)函數(shù)模型。在此基礎(chǔ)上，針對非相干散射信號處理中零時延處距離模糊大、分辨率較低，導(dǎo)致自相關(guān)函數(shù)在不同時延處均衡性較差，影響電離層散射譜估計性能的問題，提出使用自相關(guān)函數(shù)模型估計零時延自相關(guān)值的數(shù)據(jù)擬合方法?？紤]到計算復(fù)雜度，提出利用多項式函數(shù)逼近自相關(guān)函數(shù)模型的快速實現(xiàn)方法。最后，通過對實測回波數(shù)據(jù)處理結(jié)果的對比分析，證明了該方法的可行性，對提高電離層探測精度具有重要意義。
- 非相干散射雷達(dá) /
- 非相干散射譜 /
- 自相關(guān)函數(shù) /
- 數(shù)據(jù)擬合 /
- 零時延
Abstract:
Incoherent scatter spectrum plays an important role in studying the physical parameters of the ionosphere. The conventional theoretical model of incoherent scatter spectrum for derivation and calculation is extremely complicated and the model of the autocorrelation function can not be obtained . In this paper, the simplified model of ionospheric incoherent scatter spectrum is re-derived and the corresponding autocorrelation function is proposed. In the procedure of traditional incoherent scattering radar signal processing, the autocorrelation function is imbalance at different delays. This is mainly because the range resolution of zero-lag is very low, which affects the estimated performance of ionospheric scatter spectrum. Focus on this problem, a method based on data fitting is proposed to estimate the autocorrelation at zero-lag. Considering the computational complexity, a fast implementation method by polynomial functions is proposed to approach the autocorrelation function. Finally, experimental results on real echo data demonstrate the correctness and efficiency of the proposed method, which is of great significance for ionospheric detection.
- Incoherent scatter radar /
- Incoherent scatter spectrum /
- Autocorrelation function /
- Data fitting /
- Zero lag

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圖 1 離子譜圖

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圖 2 4位交替碼各時延處的距離模糊圖

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圖 3 非相干散射理論譜

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圖 4 非相干散射自相關(guān)函數(shù)圖

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圖 5 QJISR自相關(guān)函數(shù)圖

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圖 6 QJISR多高度功率譜圖

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圖 7 阻尼函數(shù)擬合曲線圖

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圖 8 阻尼擬合修正的多高度功率譜圖

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圖 9 多項式擬合與阻尼擬合的結(jié)果對比圖

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圖 10 多項式擬合修正的多高度功率譜圖

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