Clock circuit backup system of space camera multiple-imaging-channel system

Abstract

The invention relates to the space camera reliability design field and discloses a clock circuit backup system of a space camera multiple-imaging-channel system. According to the clock circuit backup system of the space camera multiple-imaging-channel system, a crystal oscillator A specially used for communication is added in each imaging channel, and cold backup of a crystal oscillator B and a crystal oscillator C is realized by receiving a control command sent by a spaceborne computer; switching and state monitoring of the crystal oscillator B and the crystal oscillator C are realized through an FPGA. Due to the fact that CCD timing-driven signals and other high-amplitude and high-power signals are generated by the multiple imaging channels at the same time by means of clock signals output by the crystal oscillator B and the crystal oscillator C, the situation that high-amplitude and high-power periodic signals in different imaging channels are generated by different crystal oscillators is avoided, and then beat interference is avoided. By the adoption of the clock circuit backup system of the space camera multiple-imaging-channel system, the reliability of a space camera imaging system is improved on the premise that image quality is not reduced.

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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