Method for transmitting image data of multi-channel high-speed line-frequency-variable linear array CCD (charge coupled device)

Abstract

The invention discloses a method for transmitting image data of a multi-channel high-speed line-frequency-variable linear array CCD (charge coupled device), and relates to the field of transmission of image data of aerospace and aviation CCD cameras. The method includes steps that a digital phase-locked loop clock management unit creates a relation between frequency of a pixel transfer clock and frequency of a TLK2711 transmission clock according to the quantity of transmission channels of the CCD, the pixel transfer clock and the quantity of transmission channels of TLK2711 devices; the TLK2711 devices create a reliable and stable transmission link for transmitting and receiving the image data; and multi-channel image data fusion transmission and line signal and image data fusion transmission units start to fuse the multi-channel data into one channel of data and transmit the channel of data to the TLK2711 devices after the transmission link is stable, and the TLK2711 deserializer transmits the channel of data to a receiving FPGA (field programmable gate array) processor. The method has the advantage that cables of an aerospace and aviation remote-sensing camera data transmission system are greatly reduced.

Description

technical field [0001] The invention relates to the field of image data transmission of aerospace CCD cameras, in particular to a method for transmitting multi-channel high-speed line-frequency variable linear array CCD image data. Background technique [0002] In high-resolution aerospace remote sensing applications, as the field of view and resolution indicators of linear array CCD cameras continue to increase, the number of CCD output channels, the number of spliced ​​pieces, and the single-port readout rate are also increasing, resulting in The amount of digitized image data increases exponentially, coupled with the real-time changes in the line frequency of the CCD camera in orbit, making image data transmission very difficult. The existing image data transmission methods based on LVDS and Camera Link do not have high-speed (digital transmission parallel clock exceeds 85MHz) transmission capabilities, and the use of multi-channel LVDS and Camera Link transmission result...

AI Technical Summary

Problems solved by technology

In the application of linear array CCD with variable line frequency, it is necessary to further deal with variable line interrupt events and increase the read and write clock frequency of SDRAM, which not only increases the system complexity and power consumption, but also puts forward the problem of electromagnetic compatibility design. Strict requirements; it is also difficult to perform image data buffering and bit conversion at high speed (digital transmission parallel clock exceeds 85MHz), and it is easy to cause loss of image data

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