天波超視距雷達(dá)海雜波模型修正與特性分析

關(guān)澤文; 陳建文; 鮑拯

doi:10.11999/JEIT170224

天波超視距雷達(dá)海雜波模型修正與特性分析

doi: 10.11999/JEIT170224

基金項(xiàng)目:

國家自然科學(xué)基金(61471391, 61072132)

計(jì)量
- 文章訪問數(shù): 1308
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- 被引次數(shù): 0
出版歷程
- 收稿日期: 2017-03-17
- 修回日期: 2017-06-05
- 刊出日期: 2017-12-19

Model Modifying and Characteristics Analyzing of Ocean Clutter in Skywave Over-the-horizon Radar

Funds:

The National Natural Science Foundation of China (61471391, 61072132)

摘要

摘要: 因受電離層調(diào)制影響，傳統(tǒng)的高頻海雜波模型難以全面描述天波超視距雷達(dá)海雜波的空域非均勻性和時(shí)域非平穩(wěn)性。該文首先基于傳統(tǒng)的Walsh 高頻海雜波模型分析了洋流的影響，提出電離層子反射面模型的概念，揭示了相干處理間隔內(nèi)電離層對高頻信號頻譜的調(diào)制機(jī)理；然后通過建立電離層等效反射面，并將其分解為多個(gè)子反射面的方式，給出可以綜合反映不同海態(tài)、不同電離層狀態(tài)的天波超視距雷達(dá)海雜波修正模型。最后結(jié)合數(shù)學(xué)描述，利用該文修正模型反演分析了由電離層的空域非均勻、時(shí)域非平穩(wěn)引起的典型高頻海雜波多普勒偏移、展寬、分裂和多徑復(fù)雜現(xiàn)象的實(shí)測數(shù)據(jù)多普勒譜，仿真與實(shí)測數(shù)據(jù)多普勒譜驗(yàn)證了所提修正模型的準(zhǔn)確性與魯棒性。
- 天波超視距雷達(dá) /
- 海雜波模型 /
- 電離層子反射面模型 /
- 電離層等效反射面
Abstract: As modulated by the ionosphere, the classical High-Frequency (HF) model of ocean clutter can not describe the HF scatterings from sea surface approvingly in view of skywave Over-The-Horizon Radar (OTHR). In this paper, ocean current is taken into consideration based on the Walsh HF sea clutter model. An equivalent ionospheric reflecting screen model is established which can be resolved into several sub screens, based on which the ionospheric modulation on frequency is discussed. Incorporating with Walsh model, a normalized sea clutter model for skywave OTHR is presented. Using the presented model, the spectrums in different cases involving Doppler shift, spectrum broadening, splitting and multipath propagation are simulated, and comparing with the measured data, the models validity and robustness are verified.
- Skywave Over-The-Horizon Radar (OTHR) /
- Sea clutter model /
- Ionospheric sub reflecting screen /
- Equivalent ionospheric reflecting screen

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參考文獻(xiàn)(31)

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