多徑條件下米波頻分MIMO雷達(dá)波束性能及優(yōu)化方法

李星星; 王黨衛(wèi); 馬曉巖

doi:10.11999/JEIT171030

多徑條件下米波頻分MIMO雷達(dá)波束性能及優(yōu)化方法

doi: 10.11999/JEIT171030

空軍預(yù)警學(xué)院 ??武漢 ??430019

基金項目: 國家自然科學(xué)基金(61179015)

詳細(xì)信息

作者簡介:
李星星：男 1988年生，博士生，研究方向為MIMO雷達(dá)信號處理、自適應(yīng)波束形成與目標(biāo)定位

王黨衛(wèi)：男 1977年生，副教授，研究方向為MIMO雷達(dá)信號處理、目標(biāo)成像與識別

馬曉巖：男 1962年生，教授，博士生導(dǎo)師，研究方向為雷達(dá)系統(tǒng)、雷達(dá)信號處理與檢測理論、現(xiàn)代信號處理及其應(yīng)用

通訊作者:
李星星 ? li_x_xing@163.com

中圖分類號: TN957
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- 被引次數(shù): 0
出版歷程
- 收稿日期: 2017-11-01
- 修回日期: 2018-04-26
- 網(wǎng)絡(luò)出版日期: 2018-06-07
- 刊出日期: 2018-08-01

Beam Performance and Optimization Method for Meter-wave Frequency Diverse MIMO Radar in Multipath Scenario

Air Force Early Warning Academy, Wuhan 430019, China

Funds: The National Natural Science Foundation of China (61179015)

摘要

摘要: 針對傳統(tǒng)米波雷達(dá)低仰角下波瓣分裂和盲區(qū)問題，該文提出一種頻率分集子孔徑MIMO雷達(dá)，構(gòu)建了該體制下多徑特性定量分析的理論框架，推導(dǎo)了鏡面反射和擾動多徑模型及其聯(lián)合發(fā)射-接收方向圖增益閉合表達(dá)式；提出了多徑抑制區(qū)概念及其邊界條件，定義了描述低空波束覆蓋性能的低可觀測率定量評價指標(biāo)；根據(jù)邊界條件的解集優(yōu)化了波束覆蓋性能。理論分析和仿真結(jié)果表明由于充分利用了頻率分集產(chǎn)生的距離依賴波束，該體制雷達(dá)相對傳統(tǒng)MIMO相控陣?yán)走_(dá)具有更優(yōu)的低空波束覆蓋性能，減小了米波雷達(dá)波瓣分裂和探測盲區(qū)。
- 頻率分集MIMO雷達(dá) /
- 距離依賴波束 /
- 多徑特性 /
- 低空波束性能
Abstract: Traditional meter-wave radar usually suffers from the problem of Beam Split (BS) and Radar Blind Area (RBA) in the situation of low-grazing angle. To alleviate this difficulty, a Frequency Diverse Subaperturing Multiple-Input Multiple-Output (FDS-MIMO) radar is proposed and a theoretical framework for the analytical investigation of multipath characteristics is presented. The specular and perturbational multipath model is built, along with closed-form expression of the joint transmit-receive beampattern gain. Moreover, a notional concept of Multipath Mitigation Area (MMA) is defined together with the corresponding boundary conditions, and the Low Observability Rate (LOR) is defined as a performance benchmarkan to evaluate the FDS-MIMO radar beam overage capability. Next, the FDS-MIMO radar low-altitude beam coverage performance is optimized according to the soutions of the boundary conditions. Both theoretical analysis and numerical results demonstrate the advantages of FDS-MIMO radar over the conventional phased-MIMO radar in terms of low altitude beam coverage performance, and the BS and RBA of meter-wave radar is decreased by ultilizing the range-dependent beampattern.
- Frequency diverse MIMO radar /
- Range-dependent beampattern /
- Multipath characteristcs /
- Low-altitude beam performance

HTML全文

圖 1 米波頻率分集MIMO雷達(dá)多徑幾何模型

下載: 全尺寸圖片幻燈片

圖 2 FDS-MIMO雷達(dá)方向圖增益曲面

下載: 全尺寸圖片幻燈片

圖 3 MIMO相控陣?yán)走_(dá)方向圖增益曲面

下載: 全尺寸圖片幻燈片

圖 4 100 km切面多徑抑制區(qū)

下載: 全尺寸圖片幻燈片

圖 5 LOR隨頻偏變化曲線

下載: 全尺寸圖片幻燈片

圖 6 不同飛行路徑下接收回波強(qiáng)度隨時間變化曲線

下載: 全尺寸圖片幻燈片

圖 7 不同擾動條件下LOR隨仰角變化曲線

下載: 全尺寸圖片幻燈片

圖 8 不同擾動條件下LOR隨距離變化曲線

下載: 全尺寸圖片幻燈片

表 1 低可觀測時間(s)

飛行路徑	1	2	3	4
MIMO相控陣體制	34.15	34.15	22.39	18.87
MIMO頻率分集體制(優(yōu)化 $\Delta f$)	8.70	0	0.75	1.00

下載: 導(dǎo)出CSV

表 2 擾動散射系數(shù)分布

編號	A	B	C	D	E
幅度	1	(0.9, 10)	(0.7, 1)	(0.6, 1)	(0.4, 1)
相位 $(^\circ )$	–180	(–190, –170)	(–200, –160)	(–200, –150)	(–220, –140)

下載: 導(dǎo)出CSV

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