Low-noise CCD signal imaging electronics system

Abstract

The invention discloses a low-noise CCD imaging electronics system based on CCD pixel signal processing, and mainly solves the problems that SNR of acquisition images of electronics technology CDS is low and the negative effect on the modulation transfer function MTF of the acquisition images of the informatics technology is high. The system is mainly composed of three parts of a signal conditioning circuit, a high-speed ADC sampling circuit and a real-time processing circuit. The signal conditioning circuit is used for generating conditioned CCD signals and initial positioning signals. The high-speed ADC sampling circuit is used for performing oversampling on the conditioned CCD signals. The real-time processing circuit is mainly used for completing receiving and processing of sampling data and outputting of the processing result. The real-time processing circuit is completed in a single FPGA chip. The low-noise CCD imaging electronics system has advantages that degree of integration is high and the CCD signals can be processed in real time so that the low-noise CCD imaging electronics system can be used for acquiring remote sensing satellite images.

Description

technical field [0001] The invention belongs to the technical field of remote sensing image processing, and relates to an imaging electronics system for parallel processing of CCD image data, which is suitable for high requirements on image signal-to-noise ratio SNR and image modulation transfer function MTF, good real-time performance of image data and integration degree Processing of demanding remote sensing images. Background technique [0002] At present, the CCD camera electronics system of visible light remote sensing satellites at home and abroad mainly uses correlated double sampling CDS technology to sample and analog-to-digital convert the CCD signal, thereby reducing the readout signal noise of the CCD device. However, there are some inherent shortcomings in the design of the imaging electronics system using the CDS structure, mainly: ① In addition to filtering out part of the noise in the filtering and correlated double-sampling CDS links, other circuit links wil...

AI Technical Summary

Problems solved by technology

For the noise in the image, it is usually regarded as a high-frequency signal for filtering processing, but since the texture and edge details of the image are also high-frequency signals, when the image is filtered and denoised, it will also have a negative impact on it. , resulting in a decrease in the modulation transfer function MTF of the image

Images