Abstract
Satellite platform jitter is a non-negligible factor that affects the image quality of optical cameras. Considering the limitations of traditional platform jitter detection methods that are based on attitude sensors and remote sensing images, this paper proposed a jitter detection method using sequence CMOS images captured by rolling shutter for high-resolution remote sensing satellite. Through the three main steps of dense matching, relative jitter error analysis, and absolute jitter error modeling using sequence CMOS images, the periodic jitter error on the imaging focal plane of the spaceborne camera was able to be measured accurately. The experiments using three datasets with different jitter frequencies simulated from real remote sensing data were conducted. The experimental results showed that the jitter detection method using sequence CMOS images proposed in this paper can accurately recover the frequency, amplitude, and initial phase information of satellite jitter at 100 Hz, 10 Hz, and 2 Hz. Additionally, the detection accuracy reached 0.02 pixels, which can provide a reliable data basis for remote sensing image jitter error compensation.
Highlights
Received: 9 December 2021Satellite platform jitter is a micro-vibration phenomenon that is caused by internal and external factors [1,2]
For ultra-high-resolution optical satellites with a spatial resolution that is better than 0.3 m, the angular resolution of a single pixel is less than 0.1 arcsecond, which means that the platform jitter of 0.1 arcsecond will cause more than 1 pixel of image distortion
Considering that the duration of a single disparity map was insufficient and that the use of a single disparity map would lead to failure to complete the low-frequency platform jitter analysis, the observation time must be extended by combining the sequence disparity maps in order to meet the requirements for low- and medium-frequency platform jitter
Summary
Received: 9 December 2021Satellite platform jitter is a micro-vibration phenomenon that is caused by internal and external factors [1,2]. 1-arcsecond platform jitter event can induce a distortion error of about 2.5 m on an image if the satellite is in a 500-km orbit [10]. For ultra-high-resolution optical satellites with a spatial resolution that is better than 0.3 m, the angular resolution of a single pixel is less than 0.1 arcsecond, which means that the platform jitter of 0.1 arcsecond will cause more than 1 pixel of image distortion. This makes it difficult to achieve the intended high-precision applications [11]
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