A clock circuit backup system for space camera multi-imaging channel system

Abstract

A clock circuit backup system of a space camera multi-imaging channel system relates to the field of space camera reliability design. The system adds a crystal oscillator A specially used for communication in each imaging channel, and realizes The cold backup of crystal oscillator B and crystal oscillator C; the switching and status monitoring functions of crystal oscillator B and crystal oscillator C are realized through FPGA. Multiple imaging channels simultaneously use the clock signal output by crystal oscillator B or crystal oscillator C to generate large-value and high-power signals such as CCD timing drive, which avoids the generation of high-power, large-value periodic signals in different imaging channels from different crystal oscillators , thereby avoiding the occurrence of beat frequency interference. The system of the invention improves the reliability of the space camera imaging system without reducing the image quality.

Description

technical field [0001] The invention belongs to the field of space camera reliability design, in particular to a clock circuit backup system of a space camera multi-imaging channel system. Background technique [0002] In the space camera where the detector is spliced ​​with multiple TDI-CCDs, each TDI-CCD corresponds to an imaging channel, each imaging channel contains an independent imaging controller FPGA, and multiple imaging channels constitute the entire imaging system. In the traditional design, in order to avoid the beat frequency crosstalk of CCD signals between multiple imaging channels, the entire imaging system shares a clock circuit. Taking two TDI-CCDs as an example, the structure is as follows figure 1 shown. [0003] The scene information is projected onto multiple TDI-CCDs spliced ​​together through the optical system. Each CCD corresponds to an imaging controller FPGA, which mainly completes the timing drive generation of TDI-CCD and the quantization cont...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem of low reliability in the traditional design method, the present invention proposes a clock circuit backup system for a space camera multi-imaging channel system

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