Imaging circuit system for space multi-spectral linear array CCD remote sensor

Abstract

A spatial multispectral linear array CCD remote sensor imaging electrical system comprises a focal plane drive unit, an image processing unit, an image composition unit, and a control unit. The CCD remote sensor in the focal plane drive unit images over the ground, converts an optical signaling of a remote sensing image to an electrical signal according to different spectrum sections, and then sends the electrical signal to the image processing unit. The image processing unit enlarges, filters the electrical signal, and then transmits the electrical signal to the image composition unit after an input level clamping, correlated double sampling and black level removing and A / D conversion are carried out on the electrical signal by the image processing unit; the image composition unit transforms data format on the image signal, converts a parallel signal to a serial signal, transforms data level on a synchronous clock and a bit clock of an output interface transmitted by the serial signal and the control unit, and converts a TTL level to a LVDS level for outputting; the control unit provides a clock control signal for other three units. The system adopts a centralized control method, which can effectively solve the problem that a plurality of spectral coverage and a plurality of units synchronously work.

Description

technical field [0001] The invention relates to a linear array CCD imaging circuit system, in particular to a multispectral linear array CCD remote sensor imaging circuit system for space observation. Background technique [0002] Most of the existing optical remote sensors have a single spectrum, and their imaging circuit system mainly includes a focal plane circuit, a drive circuit, a focal plane power supply circuit, a signal amplification circuit, and an A / D conversion circuit. The main function of the focal plane unit is to read out the CCD signal. The main function of the drive unit is to generate the CCD control sequence, and output a drive signal with a large current capability to the CCD chip. The signal amplification circuit amplifies the image signal and adjusts the signal amplitude. The A / D conversion circuit converts an analog signal into a digital signal. The focal plane circuit and the A / D conversion circuit of this imaging circuit system each contain FPGA ...

AI Technical Summary

Problems solved by technology

This kind of system structure is applicable in the imaging circuit system of a single spectral band, but in the imaging circuit system of multiple spectral bands, the focal plane circuit and the A / D conversion circuit will increase with the increase of the spectral band. If the control signals of the respective circuits are generated, the synchronous control of each circuit and each spectrum segment will become very difficult

In fact, due to the delay effect of the signal, precise synchronous control of so many circuits is basically impossible to achieve

In the existing imaging circuit system, the final output signal is parallel data, which leads to a large number of transmission wires, large cables, heavy weight, high possibility of failure, and low reliability

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