A method for suppressing aliasing of spaceflight tdi along-track push-broom image motion

Abstract

The invention discloses an aerospace TDI along-track push-sweep image shift aliasing suppression method, which relates to aerospace imaging technology. The method includes: calculating the exposure period of the original TDI camera, and the timing period of the induced charge of the pixel imaged by the TDI camera In the original time sequence, carry out n congruent subdivisions; in the original exposure time, use a counting frequency divider to increase the frequency division output, and the frequency division output value is one-nth of the original exposure time; according to the subdivided time sequence, Perform multiple selection and reading of the quantized voltage value of the induced charge of the pixel; superimpose the quantized charge voltage value with a low degree of aliasing of the object point in the corresponding area of ​​the pixel, and save the superimposed data. The method of the invention is simple to implement, can improve the imaging situation, does not need to change too much hardware, suppresses imaging aliasing, improves imaging quality, and meets the requirements of aerospace TDI high-definition imaging.

Description

technical field [0001] The invention relates to aerospace imaging technology, in particular to a method for suppressing aliasing caused by continuous relative motion between an object point and a pixel during the aerospace TDI push-broom imaging process. Background technique [0002] At present, Time Delayed and Integration (TDI) cameras have a wide range of applications, such as in-motion imaging, satellite remote sensing imaging, low-light imaging and other systems. The TDI camera imaging system needs to place several levels of pixel line arrays in the direction of cross-track movement, and the line array image sensor and the target object have relative motion, so as to obtain stitched panoramic images along the track direction. The TDI camera contains more than one level of pixel line arrays, and performs multiple exposures of the same target point in a continuous line array, and at the same time performs the transfer and superposition of induced charges, which is equival...

AI Technical Summary

Problems solved by technology

[0004] The main purpose of the present invention is to provide a method for suppressing aliasing of push-broom image motion along the track of aerospace TDI, which solves the problem that the corresponding object point of the pixel has relative motion during the exposure time, resulting in a decrease in image definition.

Images