Device for real-time transmission, compression and storage of images of space TDICCD (Time Delay and Integration Charge Coupled Device) camera

Abstract

The invention relates to a device for real-time transmission, compression and storage of images of a space TDICCD (Time Delay and Integration Charge Coupled Device) camera. The device comprises high-speed, middle-speed and low-speed transmission units of channels of CCD (CCD (Charge Coupled Devices), an image frame constructing unit, a compression parameter storage device, a compression chip array, a compression chip controller, a storage array controller, an error-correcting encoder, a high-capacity fixed storage unit, and a compressed code stream transmission unit. The device for real-time transmission, compression and storage of images of the space TDICCD camera can transmit image data of each channel of CCD reliably and transmit the images to an image real-time compression unit. The image real-time compression unit samples a frame constructing strategy, a special chip compression strategy and the like. The compressed code stream is stored in a high-capacity NAND flash memory at the presence of an error correction algorithm to overcome the single-event upset phenomenon. Finally, the compressed code stream is transmitted to a satellite data transmission system through a G-level transmission mode.

Description

technical field [0001] The invention belongs to the field of research and development of space multi-spectrum TDICCD camera electronics system, in particular to a space TDICCD camera image real-time transmission, compression and storage device. Background technique [0002] With the continuous improvement of field of view and resolution index requirements of space cameras based on multispectral time delay integration (TDI) charge-coupled device (CCD) imaging technology, the number of spliced ​​pieces and readout rate of multispectral CCDs used are also increasing. Increase and improve, so that the amount of digitized CCD image data has increased significantly, the satellite memory capacity is limited, and the transmission bandwidth is limited. Therefore, the image information must be compressed before being transmitted to the ground. Usually the CCD imaging unit is near the focal plane, while the image compression and storage system is in the camera electronics. The two cam...

AI Technical Summary

Problems solved by technology

At present, the hardware implementation of the image compression algorithm is not only complicated, but also takes up a lot of resources, and it is difficult to achieve the real-time performance required by the camera. At the same time, it is difficult to integrate the hardware implementation into the camera system.

In addition, because the camera works in a space environment, it is easily affected by radiation, which causes single event flipping in the image memory. Therefore, it is necessary to design special technology to protect the storage.

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