S波段高分辨寬幅SAR輻射定標及誤差分析方法

劉亞波; 劉霖; 童智勇; 喻忠軍

doi:10.11999/JEIT180983

S波段高分辨寬幅SAR輻射定標及誤差分析方法

doi: 10.11999/JEIT180983

中國科學院電子學研究所北京 100190

基金項目: 國家自然科學基金(61201405)，中國科學院青年創(chuàng)新促進會(2017170)

詳細信息

作者簡介:
劉亞波：男，1984年生，副研究員，研究方向為合成孔徑雷達系統仿真與信號處理

劉霖：男，1982年生，副研究員，研究方向為合成孔徑雷達數字信號處理

童智勇：男，1966年生，研究員，研究方向為機載合成孔徑雷達系統設計

喻忠軍：男，1980年生，研究員，研究方向為機載合成孔徑雷達系統設計

通訊作者:
劉亞波 ybliu@mail.ie.ac.cn

中圖分類號: TN958.2
計量
- 文章訪問數: 2018
- HTML全文瀏覽量: 1104
- PDF下載量: 106
- 被引次數: 0
出版歷程
- 收稿日期: 2018-10-19
- 修回日期: 2019-03-14
- 網絡出版日期: 2019-04-16
- 刊出日期: 2019-08-01

A Radiometric Calibration and Error Analysis Method for HWRS SAR at S-band

Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China

Funds: The National Natural Science Foundation of China (61201405), The Youth Innovation Promotion Association of Chinese Academy of Sciences (2017170)

摘要

摘要: 合成孔徑雷達(SAR)系統的輻射定標可以構建SAR圖像與地物后向散射截面積(RCS)的關系，反演目標物理特性，滿足SAR定量化遙感需求。相對于其它波段，S波段SAR的定量化遙感工作罕見報道。該文利用已知SAR及平臺參數進行S波段SAR輻射定標處理，首先推得了圖像像素值與目標后向散射系數的關系，接下來詳細分析了各項誤差對定標精度的影響，給出了天線指向誤差對定標精度影響的解析表達式。該文的分析有利于建立各參數與輻射定標精度的關系，方便設計時候的誤差分配。該文給出了草地、道路和平靜水面的S波段后向散射截面積統計值。最終實際數據處理結果表明，該系統利用該定標方法可以在20°的視角范圍內實現較高的絕對輻射精度。
- 合成孔徑雷達 /
- S波段 /
- 輻射定標 /
- 誤差分析 /
- 后向散射截面積
Abstract: The radiometric calibration of Synthetic Aperture Radar (SAR) can establish a mapping relationship between SAR image and Radar Cross Section (RCS) of ground objects, which benefits the inversion of target physical properties, and further meets the needs of quantitative remote sensing. Compared with other wavebands, the reports about SAR works in S-band are rare. This paper focuses on the radiometric calibration of radar at S-band by using the known parameters of radar and plane. Firstly, the relationship between image pixel intensity and RCS of target is derived. Then, a detailed analysis on each error component is implemented, in which, the affection of antenna direction on radiometric calibration precision is given by the analytic expression. The analysis and simulation is propitious to error allocation during the design period. In addition, the mean RCS statistics of grass, road and calm water are given. The real data processing results show that a sufficient accuracy in 20° view angle can be achieved by using the radiometric calibration method.
- Synthetic Aperture Radar (SAR) /
- S-band /
- Radiometric calibration /
- Error analysis /
- Radar Cross Section (RCS)

HTML全文

圖 1 sinc形天線方向圖誤差系數值與a的關系

下載: 全尺寸圖片幻燈片

圖 2 cosine形天線方向圖誤差系數值與a的關系

下載: 全尺寸圖片幻燈片

圖 3 波束指向誤差對sinc形天線方向圖的影響

下載: 全尺寸圖片幻燈片

圖 4 波束指向誤差對cosine形天線方向圖的影響

下載: 全尺寸圖片幻燈片

圖 5 Google earth定標場布設圖

下載: 全尺寸圖片幻燈片

圖 6 定標場成像結果

下載: 全尺寸圖片幻燈片

圖 7 S波段草地、光滑道路和平靜水面的RCS值

下載: 全尺寸圖片幻燈片

表 1 雷達及飛行參數表

參數	數值
平均功率(W)	19.2
距離范圍(m)	3450～6250
視角范圍(°)	48～70
采樣頻率(MHz)	400
波長(m)	0.09375
距離采樣間隔(m)	0.375
接收機增益(dB)	67
飛機速度(m/s)	70

下載: 導出CSV

表 2 定標器RCS測量結果(dB)

	像素值		絕對輻射精度
	定標圖	檢驗圖	定標圖	檢驗圖	1°誤差圖
T1	128.8	128.2	20.5	19.9	18.7
T2	128.4	128.4	20.1	20.0	19.0
T3	128.4	128.7	20.1	20.3	19.3
T4	128.9	129.3	20.6	21.0	20.1
T5	129.1	129.5	20.8	21.2	20.9
T6	129.1	129.4	20.8	21.0	21.4
T7	128.9	129.0	20.6	20.6	22.0
T8	128.6	128.6	20.3	20.2	21.9
T9	128.3	128.7	20.0	20.3	22.7
T10	128.3	128.6	20.0	20.2	22.4

下載: 導出CSV

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