A position error calibration algorithm for conformal arrays

2021 ◽  
Author(s):  
X. Zhang ◽  
G. Liao ◽  
Z. Yang ◽  
S. Li
Keyword(s):  
Position Error ◽  
Conformal Arrays ◽  
Calibration Algorithm ◽  
Error Calibration

Error Calibration System for Time Grating Angular Displacement Sensor

2013 ◽  
Vol 662 ◽  
pp. 705-708
Author(s):  
Zhong Hua Gao
Keyword(s):  
Angular Displacement ◽  
Least Square Method ◽  
Least Square ◽  
Displacement Sensor ◽  
Calibration System ◽  
Displacement Sensors ◽  
Optical Grating ◽  
Calibration Algorithm ◽  
Error Calibration ◽  
Angular Displacements

A calibration system was developed for time grating angular displacement sensors to calibrate errors of this type of sensor. In the system, the motor was controlled by ARM processor according to the setting value coming from the USB port of the computer, and therefore the motor outputted angular displacement values. Meanwhile, with the motor turning, the optical grating, which was used as the criterion instrument, and time grating turned together corresponding angular displacements. Several displacement values from a circle of sensors of time grating and optical grating were sent to computer by serial port to be processed. Furthermore, an error calibration algorithm, which was based on the least square method (LMS), was used in this calibration system. The precise of time grating can reach to ±0.7″after calibrating using this algorithm and the process of error calibration can be automatically made by the computer.

scholarly journals An Iterative Doppler Velocity Log Error Calibration Algorithm Based on Newton Optimization

2020 ◽  
Vol 2020 ◽  
pp. 1-9
Author(s):  
Wang Guangcai ◽  
Xiaosu Xu ◽  
Yiqing Yao
Keyword(s):  
Loss Function ◽  
Inertial Navigation System ◽  
Quadratic Function ◽  
Field Tests ◽  
Calibration Method ◽  
Doppler Velocity ◽  
First Order ◽  
Attitude Error ◽  
Calibration Algorithm ◽  
Error Calibration

The performance of the inertial navigation system/Doppler velocity log (INS/DVL) is mainly degraded by DVL error. An optimization-based algorithm is widely used and effective on calibrating DVL error. In this algorithm, the loss function established is a quadratic function of DVL attitude error; however, the existing optimization-based calibration method is just of first-order generally, so that it is not able to reach the best calibration efficiency. In order to improve the efficiency, an iterative calibration algorithm based on the second-order Newton optimization is proposed innovatively to calibrate the DVL error. In addition, the Wolfe principle is introduced to limit its loss function’s oscillation around the extreme point to improve the efficiency and accuracy of the Newton optimization. The excellent efficiency and accuracy of the proposed calibration scheme are validated by simulation and field tests.

Improved Channel Error Calibration Algorithm for Azimuth Multichannel SAR Systems

2016 ◽  
Vol 13 (7) ◽  
pp. 1022-1026 ◽  
Author(s):  
Xiaojiang Guo ◽  
Yesheng Gao ◽  
Kaizhi Wang ◽  
Xingzhao Liu
Keyword(s):  
Channel Error ◽  
Calibration Algorithm ◽  
Error Calibration

Stage error calibration for coordinates measuring machines based on self-calibration algorithm

2015 ◽  
Vol 41 ◽  
pp. 86-95 ◽  
Author(s):  
Daodang Wang ◽  
Xixi Chen ◽  
Yangbo Xu ◽  
Tiantai Guo ◽  
Ming Kong ◽  
...  
Keyword(s):  
Self Calibration ◽  
Calibration Algorithm ◽  
Error Calibration

Analysis of Phased Array Antenna’s Vibration Effects on the Performance of Shipborne MLS

2014 ◽  
Vol 687-691 ◽  
pp. 1080-1086
Author(s):  
Hong Sen Xie ◽  
Peng Zhou ◽  
Jun Gan Wei ◽  
Ding Wang
Keyword(s):  
Random Vibration ◽  
Phased Array ◽  
Array Antenna ◽  
Phased Array Antenna ◽  
Array Pattern ◽  
Calibration Algorithm ◽  
Navigation Error ◽  
Error Calibration ◽  
Flight Deck ◽  
Vibration Error

In order to provide precise guidance for the landing of carrier-based aircrafts, the phased array antenna and the principle of time reference scanning beam are used in the shipborne MLS. The phased array antenna is installed under the flight deck of the ship stern, so the vibration could change the relative position of antenna elements, which will cause the navigation error. In this paper, through the establishment of antenna array pattern and phased array antenna vibration error model, an error calibration algorithm is proposed after the simulation of phased array antenna’s random vibration effects on the guiding performance of shipborne MLS in three axes. Computer simulations show that the calibration algorithm could improve the guiding performance of shipborne MLS.

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