Error analysis of stereo positioning based on precise parameter error model for high-resolution airborne SAR images

2008 ◽  
Author(s):  
L. Pang ◽  
F. Pang ◽  
Q. Yan ◽  
W. Q. Dong
Keyword(s):  
High Resolution ◽  
Error Analysis ◽  
Error Model ◽  
Sar Images ◽  
Airborne Sar ◽  
Parameter Error

scholarly journals Road Extraction from High-Resolution SAR Images via Automatic Local Detecting and Human-Guided Global Tracking

2012 ◽  
Vol 2012 ◽  
pp. 1-10 ◽  
Author(s):  
Jianghua Cheng ◽  
Wenxia Ding ◽  
Xishu Ku ◽  
Jixiang Sun
Keyword(s):  
High Resolution ◽  
Sar Images ◽  
The Road ◽  
Global Tracking ◽  
On The Road ◽  
Airborne Sar ◽  
Fitting In ◽  
Searching Method ◽  
Local Detection ◽  
Local Road

Because of existence of various kinds of disturbances, layover effects, and shadowing, it is difficult to extract road from high-resolution SAR images. A new road center-point searching method is proposed by two alternant steps: local detection and global tracking. In local detection step, double window model is set, which consists of the outer fixed square window and the inner rotary rectangular one. The outer window is used to obtain the local road direction by using orientation histogram, based on the fact that the surrounding objects always range along with roads. The inner window rotates its orientation in accordance with the result of local road direction calculation and searches the center points of a road segment. In global tracking step, particle filter of variable-step is used to deal with the problem of tracking frequently broken by shelters along the roadside and obstacles on the road. Finally, the center-points are linked by quadratic curve fitting. In 1 m high-resolution airborne SAR image experiment, the results show that this method is effective.

scholarly journals Airborne SAR Radiometric Calibration Based on Improved Sliding Window Integral Method

Sensors ◽  
2022 ◽  
Vol 22 (1) ◽  
pp. 320
Author(s):  
Lu Li ◽  
Fengli Zhang ◽  
Yun Shao ◽  
Qiufang Wei ◽  
Qiqi Huang ◽  
...  
Keyword(s):  
Remote Sensing ◽  
High Resolution ◽  
Integral Method ◽  
Target Position ◽  
Sliding Window ◽  
Radiometric Calibration ◽  
Sar Images ◽  
Point Target ◽  
Airborne Sar ◽  
The Impact

To verify the performance of the high-resolution fully polarimetric synthetic aperture radar (SAR) sensor carried by the Xinzhou 60 remote-sensing aircraft, we used corner reflectors to calibrate the acquired data. The target mechanism in high-resolution SAR images is more complex than it is in low-resolution SAR images, the impact of the point target pointing error on the calibration results is more obvious, and the target echo signal of high-resolution images is more easily affected by speckle noise; thus, more accurate extraction of the point target position and the response energy is required. To solve this problem, this paper introduces image context information and proposes a method to precisely determine the integration region of the corner reflector using sliding windows based on the integral method. The validation indicates that the fully polarimetric SAR sensor on the Xinzhou 60 remote-sensing aircraft can accurately reflect the radiometric characteristics of the ground features and that the integral method can obtain more stable results than the peak method. The sliding window allows the position of the point target to be determined more accurately, and the response energy extracted from the image via the integral method is closer to the theoretical value, which means that the high-resolution SAR system can achieve a higher radiometric calibration accuracy. Additionally, cross-validation reveals that the airborne SAR images have similar quality levels to Sentinel-1A and Gaofen-3 images.

A Global Stationary Minimum Level Set Segmentation Method for High-resolution SAR Images

2010 ◽  
Vol 32 (11) ◽  
pp. 2618-2623 ◽  
Author(s):  
Ji-lan Feng ◽  
Zong-jie Cao ◽  
Yi-ming Pi
Keyword(s):  
High Resolution ◽  
Level Set ◽  
Segmentation Method ◽  
Minimum Level ◽  
Sar Images ◽  
Level Set Segmentation

scholarly journals Research of Calibration Method for Industrial Robot Based on Error Model of Position

2021 ◽  
Vol 11 (3) ◽  
pp. 1287
Author(s):  
Tianyan Chen ◽  
Jinsong Lin ◽  
Deyu Wu ◽  
Haibin Wu
Keyword(s):  
Coordinate System ◽  
Industrial Robot ◽  
Calibration Method ◽  
Error Model ◽  
Position Error ◽  
Industrial Robots ◽  
Positioning Error ◽  
Robot Position ◽  
General Measurement ◽  
Parameter Error

Based on the current situation of high precision and comparatively low APA (absolute positioning accuracy) in industrial robots, a calibration method to enhance the APA of industrial robots is proposed. In view of the "hidden" characteristics of the RBCS (robot base coordinate system) and the FCS (flange coordinate system) in the measurement process, a comparatively general measurement and calibration method of the RBCS and the FCS is proposed, and the source of the robot terminal position error is classified into three aspects: positioning error of industrial RBCS, kinematics parameter error of manipulator, and positioning error of industrial robot end FCS. The robot position error model is established, and the relation equation of the robot end position error and the industrial robot model parameter error is deduced. By solving the equation, the parameter error identification and the supplementary results are obtained, and the method of compensating the error by using the robot joint angle is realized. The Leica laser tracker is used to verify the calibration method on ABB IRB120 industrial robot. The experimental results show that the calibration method can effectively enhance the APA of the robot.

Efficiency and Robustness Improvement of Airborne SAR Motion Compensation With High Resolution and Wide Swath

2020 ◽  
pp. 1-5
Author(s):  
Jianlai Chen ◽  
Buge Liang ◽  
Junchao Zhang ◽  
De-Gui Yang ◽  
Yuhui Deng ◽  
...  
Keyword(s):  
High Resolution ◽  
Motion Compensation ◽  
Airborne Sar ◽  
Wide Swath
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