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
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
-
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。
-
關(guān)鍵詞:
- 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.
-
GORDON W E. Incoherent scattering of radio waves by free electrons with applications to space exploration by radar[J]. Proceedings of the Ire, 2007, 46(11): 1824–1829. doi: 10.1109/JRPROC.1958.286852 WEN C H, BRICZINSKI S J, LIVNEH D J, et al. Pulse-level interference and meteor processing of Arecibo ISR data[J]. Journal of Atmospheric and Solar-Terrestrial Physics, 2007, 69(9): 973–980. doi: 10.1016/j.jastp.2007.03.004 EVANS J V. Theory and practice of ionosphere study by Thomson scatter radar[J]. Proceedings of the IEEE, 1969, 57(4): 496–530. doi: 10.1109/PROC.1969.7005 王凱麗, 姚明, 鄧曉華. 非相干散射雷達(dá)電離層參數(shù)提取簡化算法的仿真[J]. 南昌大學(xué)學(xué)報(工科版), 2017, 39(2): 200–204. doi: 10.13764/j.cnki.ncdg.2017.02.019WANG Kaili, YAO Ming, and DENG Xiaohua. Simulation on a simplified algorithm for ionospheric incoherent scatter radar parameter extraction[J]. Journal of Nanchang University (Engineering &Technology) , 2017, 39(2): 200–204. doi: 10.13764/j.cnki.ncdg.2017.02.019 鄭傳青, 吳健. 高緯電離層中非麥克斯韋分布等離子體的非相干散射譜的模擬[J]. 地球物理學(xué)報, 1994, 37(4): 433–438. doi: 10.3321/j.issn:0001-5733.1994.04.003ZHENG Chuanqing and WU Jian. A computation of the incoherent radar spectra of non-maxwellian plasma in the high-latitude ionosphere[J]. Chinese Journal of Geophysics, 1994, 37(4): 433–438. doi: 10.3321/j.issn:0001-5733.1994.04.003 徐彬, 吳振森, 吳健, 等. 碰撞等離子體的非相干散射譜[J]. 物理學(xué)報, 2009, 58(7): 5104–5110. doi: 10.3321/j.issn:1000-3290.2009.07.115XU Bin, WU Zhensen, WU Jian, et al. Incoherent scatter spectrum of a collisional plasma[J]. Acta Physica Sinica, 2009, 58(7): 5104–5110. doi: 10.3321/j.issn:1000-3290.2009.07.115 薛昆, 許正文, 吳健, 等. 高緯極區(qū)離子速度分布函數(shù)多項式解及非相干散射譜計算[J]. 空間科學(xué)學(xué)報, 2015, 35(4): 424–437. doi: 10.11728/cjss2015.04.424XUE Kun, XU Zhengwen, WU Jian, et al. Polynomial solutions of the ion velocity distributions and the calculation of incoherent scatter spectra in the high-latitude auroral ionosphere[J]. Chinese Journal of Space Science, 2015, 35(4): 424–437. doi: 10.11728/cjss2015.04.424 金旺, 楊玉峰, 李清亮, 等. 曲靖非相干散射雷達(dá)在空間碎片探測中的應(yīng)用[J]. 電子學(xué)報, 2016, 46(1): 252–256. doi: 10.3969/j.issn.0372-2112.2018.01.035JIN Wang, YANG Yufeng, LI Qingliang, et al. Application of Qujing incoherent scattering radar in space debris detection[J]. Acta Electronica Sinica, 2016, 46(1): 252–256. doi: 10.3969/j.issn.0372-2112.2018.01.035 魯自清, 姚明, 鄧曉華. 關(guān)于非相干散射雷達(dá)對電離層參數(shù)測量仿真[J]. 計算機仿真, 2017, 34(1): 16–19. doi: 10.3969/j.issn.1006-9348.2017.01.004LU Ziqing, YAO Ming, and DENG Xiaohua. Parameters detect simulation of incoherent scatter radar[J]. Computer Simulation, 2017, 34(1): 16–19. doi: 10.3969/j.issn.1006-9348.2017.01.004 LI Lin, CHEN Yajie, JI Hongbing, et al. Research on signal modulation and processing for incoherent scatter radar[C]. International Conference on Information, Communications and Signal Processing, Singapore, 2016: 1–4. LI Lin, LU Yifeng, DING Zonghua, et al. A modified parameter model-based spectrum estimation method for incoherent scatter radar[C]. International Conference on Image, Vision and Computing, Chengdu, China, 2017: 863–867. NYGREN T. Introduction to Incoherent Scatter Measurements[M]. Sodankyla Finland: INVERS OY, 1996: 15–20. 徐彬, 王占閣, 許正文, 等. 基于各向異性分布的非相干散射雷達(dá)譜仿真[J]. 空間科學(xué)學(xué)報, 2017, 37(6): 710–716. doi: 10.11728/cjss2017.06.710XU Bin, WANG Zhange, XU Zhengwen, et al. Simulation of incoherent scatter radar spectra based on inhomogeneous distribution[J]. Chinese Journal of Space Science, 2017, 37(6): 710–716. doi: 10.11728/cjss2017.06.710 SHEFFIELD J. Plasma Scattering of Electromagnetic Radiation[M]. New York: Academic Press, 1975: 113–122. MADSEN K, NIELSEN H B, and TINGLEFF O. Methods for Non-Linear Least Squares Problems[M]. Lyngby: Informatics and Mathematical Modelling Technical University of Denmark, 2004: 17–47. 王存有, 黃張裕, 汪閂林, 等. BP神經(jīng)網(wǎng)絡(luò)與多項式擬合在沉降檢測中的應(yīng)用[J]. 地理空間信息, 2017, 15(6): 107–108. doi: 10.3969/j.issn.1672-4623.2017.06.033WANG Cunyou, HUANG Zhangyu, WANG Shuanlin, et al. The application of BP neural network and polynomial fitting in settlement monitoring[J]. Geospatial Information, 2017, 15(6): 107–108. doi: 10.3969/j.issn.1672-4623.2017.06.033 -