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国土资源遥感  2018, Vol. 30 Issue (2): 53-59    DOI: 10.6046/gtzyyg.2018.02.07
     技术方法 本期目录 | 过刊浏览 | 高级检索 |
基于轨道参数修正的PALSAR-2影像正射校正技术
李艳艳1,2(), 唐娉1(), 胡昌苗1, 单小军1
1.中国科学院遥感与数字地球研究所,北京 100101
2.中国科学院大学,北京 100049
PALSAR-2 image ortho-rectification based on orbit parameters modulation
Yanyan LI1,2(), Ping TANG1(), Changmiao HU1, Xiaojun SHAN1
1.Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, Beijing 100101, China
2.University of Chinese Academy of Sciences, Beijing 100049, China
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摘要 

对PALSAR-2影像进行正射校正来评估新一代L波段的传感器的应用潜力有重要的意义。校正过程中的轨道参数误差会影响最终的校正精度。基于此,给出一种基于轨道参数修正和RD模型简化解算的PALSAR-2影像校正方法,利用模拟SAR与真实SAR影像的配准,修正轨道参数,再利用修正后的轨道参数与RD模型简化解算,完成校正工作。将该方法同时应用于PALSAR-2和PALSAR影像,并与没有经过轨道参数修正的方法进行比较,结果表明该方法可操作性强,相比于没有经过轨道参数修正的方法有较高的精度,且新一代L波段传感器影像的校正精度更高,这也进一步证实了新一代L波段传感器有更强的性能指标,应用潜力更大。

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李艳艳
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胡昌苗
单小军
关键词 距离-多普勒模型轨道参数正射校正PALSAR-2    
Abstract

Evaluation the application potential of the new generation L-band sensor by ortho-rectifying of the PALSAR-2 image has an important significance. The error of orbital parameter in the rectification process will affect the final ortho-rectification precision. To tackle this problem, this paper proposes an ortho-rectification algorithm for PALSAR-2 image based on orbit parameters modulation and simplified calculation. Orbit parameters are modulated by registration of the simulate image and the real image. By using the modulated orbit parameters and simplified calculation of the range doppler(RD) model, ortho-rectification is performed. The method was applied to PALSAR-2 image and PALSAR image at the same time and it was compared with the PALSAR-2 ortho-rectification image without orbit parameters modulation. The result shows that the algorithm has strong operability and high geometric accuracy and that the new generation L-band sensor image’s rectification accuracy is higher, which further confirms that the new generation L-band sensor has better performance and greater application potential.

Key wordsRD model    orbit parameter    ortho rectification    PALSAR-2
收稿日期: 2016-11-15      出版日期: 2018-05-30
:  TP79  
基金资助:ALOS-2 RA4科学研究项目“Building extraction and 3D reconstruction using dual-aspect high resolution interferometric ALOS-2 data”(编号: PI1404)
通讯作者: 唐娉
引用本文:   
李艳艳, 唐娉, 胡昌苗, 单小军. 基于轨道参数修正的PALSAR-2影像正射校正技术[J]. 国土资源遥感, 2018, 30(2): 53-59.
Yanyan LI, Ping TANG, Changmiao HU, Xiaojun SHAN. PALSAR-2 image ortho-rectification based on orbit parameters modulation. Remote Sensing for Land & Resources, 2018, 30(2): 53-59.
链接本文:  
https://www.gtzyyg.com/CN/10.6046/gtzyyg.2018.02.07      或      https://www.gtzyyg.com/CN/Y2018/V30/I2/53
Fig.1  像点位移
Fig.2  PALSAR-2正射校正流程
参数 ALOS-2 PALSAR-2 ALOS PALSAR
拍摄时间 2014-10-26,升轨 2010-12-16,升轨
中心经纬度/(°) E138.716,N35.579 E138.705,N35.803
载波频率/GHz 1.236 1.270
天底偏角/(°) 28 43.4
入射角/(°) 31.1 49.645
极化方式 全极化 HH
PRF 2 320.863 848.896
近地点斜距/km 719.291 987.469
参考坐标系统 ECR ECR
Tab.1  研究区影像信息
Fig.3  PALSAR-2影像
Fig.4  DEM 影像
Fig.5  PALSAR-2模拟影像
Fig.6  PALSAR-2校正影像
Fig.7  PALSAR校正影像
Fig.8  PALSAR-2未经轨道修正校正影像
点号 实际坐标 PALSAR -2校正影像 未经轨道修正的PALSAR -2校正影像
校正坐标 坐标差 校正坐标 坐标差
x y x y Δx Δy x y Δx Δy
1 301 470 3 920 022 301 461 3 920 021 9 1 301 459 3 920 028 11 6
2 299 655 3 921 460 299 649 3 921 451 6 9 299 647 3 921 451 8 9
3 297 900 3 904 394 297 898 3 904 392 2 2 297 890 3 904 382 10 12
4 289 693 3 931 157 289 686 3 931 150 7 7 289 686 3 931 141 7 16
5 289 290 3 931 063 289 293 3 931 065 3 2 289 299 3 931 066 9 3
6 288 781 3 930 926 288 776 3 930 929 5 3 288 766 3 930 914 15 12
7 288 387 3 930 908 288 385 3 930 899 2 9 288 383 3 930 899 4 9
8 283 306 3 929 923 283 293 3 929 922 13 1 283 293 3 929 910 13 13
9 283 238 3 930 228 283 234 3 930 221 4 7 283 234 3 930 221 4 7
10 281 628 3 928 258 281 626 3 928 266 2 8 281 620 3 928 266 8 8
11 277 290 3 909 780 277 283 3 909 787 7 7 277 272 3 909 787 18 7
12 274 895 3 934 615 274 889 3 934 618 6 3 274 889 3 934 625 6 10
13 269 652 3 932 515 269 653 3 932 514 1 1 269 659 3 932 503 7 12
14 267 860 3 927 380 267 852 3 927 384 8 4 267 845 3 927 384 15 4
15 267 434 3 924 644 267 437 3 924 652 3 8 267 437 3 924 652 3 8
Tab.2  PALSAR -2校正影像及未经轨道修正的校正影像精度评价
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