Unlock instant, AI-driven research and patent intelligence for your innovation.

Method and device for correcting non-uniformity of image of high-dynamic star sensor

A non-uniformity correction and non-uniformity correction technology, applied in the field of high dynamic star sensor image non-uniformity correction method and device, can solve the effect of limiting correction star sensor measurement accuracy, integration time condition gain and integration time conditions are different And other issues

Active Publication Date: 2013-12-11
BEIHANG UNIV
View PDF9 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in the practical application of high dynamic star sensors, it is necessary to adjust the two parameters of low-light detection device gain and integration time to control the imaging quality. The gain and integration time conditions of the calibration image are different, and the existing non-uniformity correction methods do not compensate for the different shooting conditions of the calibration image and the image to be corrected. Measurement accuracy of the sensor

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method and device for correcting non-uniformity of image of high-dynamic star sensor
  • Method and device for correcting non-uniformity of image of high-dynamic star sensor
  • Method and device for correcting non-uniformity of image of high-dynamic star sensor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0128] The non-uniform correction method of the high dynamic star sensor image in this embodiment, such as figure 2 shown, including the following steps:

[0129] Step 201: Input the star map to be corrected and two calibration images, and then perform step 202;

[0130] Here, it is assumed that the gain of the star map to be corrected is g1, the gain of the two calibration images is g2, the integration time of the star map to be corrected is t1, and the integration time of the two calibration images is t2.

[0131] Step 202: Determine whether g1 is equal to g2, if yes, execute step 204, otherwise, execute step 203.

[0132] Step 203: Perform gain condition transformation and gain response non-uniformity correction on the two calibration images, and then perform step 204.

[0133] Step 204: Judging whether t1 is equal to t2, if yes, execute step 206, otherwise, execute step 205.

[0134] Step 205: Perform integration time condition transformation and integration time respo...

Embodiment 2

[0137] In this embodiment, it is determined that the star map to be corrected is different from the gain and integration time of the two calibration images, and the gain condition transformation and gain response non-uniformity correction and integration time are sequentially performed on the two calibration images. The processing method of condition transformation and integration time response non-uniformity correction, set the gain of the star map to be corrected as g1, the gain of the two calibration images as g2, the integration time of the star map to be corrected as t1, and the gain of the two calibration images The integration time is t2.

[0138] The non-uniform correction method of the high dynamic star sensor image in this embodiment, such as image 3 shown, including the following steps:

[0139] Step 301: Input the star map to be corrected and two calibration images, and then perform step 302.

[0140] Step 302: After determining that the star map to be corrected...

Embodiment 3

[0189] In this embodiment, when the high dynamic star sensor of the ICCD image sensor collects the star map, the gain used when collecting the star map is 105, and the integration time is 4ms. The gain used when shooting the calibration image is 75, and the integration time is 6ms. That is: the gain of the star map to be corrected is 105, the integration time is 4ms, the gain of the calibration image is 75, and the integration time is 6ms.

[0190] Utilize the improved two-point temperature calibration correction method based on the detector nonlinear response model and the high dynamic star sensor image non-uniformity correction method provided by the present invention to perform star map non-uniformity correction. Table 1 provides two methods the calibration result.

[0191] Table 1

[0192]

[0193]

[0194] As can be seen from Table 1, compared with the improved two-point temperature calibration correction method based on the detector nonlinear response model, the s...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a method for correcting the non-uniformity of an image of a high-dynamic star sensor. The method comprises the following steps of: determining that the gains and / or the integrating time of a star image to be corrected and two calibration images are different, performing gain condition conversion and gain response non-uniformity correction and / or integrating time condition conversion and integrating time response non-uniformity correction on the two calibration images according to an imaging model of an intensified charge coupled device (ICCD); and correcting the non-uniformity of the star image to be corrected by adopting the corrected calibration images. The invention also discloses a device for correcting the non-uniformity of the image of the high-dynamic star sensor. By adopting the method and the device, the non-uniformity of the star image can be restrained effectively, so the measuring precision of the star sensor can be improved effectively.

Description

technical field [0001] The invention relates to spacecraft attitude measurement technology, in particular to a method and device for correcting image non-uniformity of a high-dynamic star sensor. Background technique [0002] Star Sensor is a high-precision, high-reliability attitude measurement component widely used in today's aerospace vehicles. The operation of high-dynamic carriers puts forward very high requirements on the dynamic performance of star sensors. Therefore, how to improve the dynamic performance of star sensors has become a new research hotspot. [0003] Under high dynamic conditions, the dispersion of star point energy will cause the detection sensitivity of the star sensor to drop sharply, and the number of observed stars in the field of view will be significantly reduced, and the normal attitude output cannot be guaranteed. Therefore, in order to improve the detection sensitivity of the star sensor, there have been low-light detection devices such as en...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G01C25/00
Inventor 张广军金雁江洁
Owner BEIHANG UNIV