Spacecraft image decomposition and transmission method

Abstract

The invention discloses a spacecraft image decomposition and transmission method. In the method, a high-resolution image on a spacecraft is decomposed into a plurality of non-overlapped sub-images containing overall information of the original image; the sub-images are synthesized by using different encoding and encrypting modes and then transmitted; error codes do not have great influence on the overall image during the transmission; and data is distributed to K-class users with different requirements on image quality on ground, so that the images received by different users have different qualities, namely the users of high authority class acquire the images with high qualities, and the users of low authority class acquire the images with low qualities. Certain compression effect can be achieved by the method instead of conventional image compression modes, so the complexity of processing and transmission equipment on the spacecraft is greatly reduced; and meanwhile, the complexity of the ground image processing and restoring equipment is not changed, so the efficiency and the safety of image transmission of the spacecraft are improved and the images with different qualities are distributed as required.

Description

technical field [0001] The invention belongs to the field of communication, and relates to a spacecraft image transmission method. Background technique [0002] With the development of space remote sensing and earth observation technology, the image resolution acquired by spacecraft is getting higher and higher, and the raw data rate is getting higher and higher, which can reach hundreds of Mbps to tens of Gbps. The image quality is getting higher and higher, the usage is wider and wider, and there are more and more users; even if the image resolution is artificially reduced, the quality of the obtained image is still quite high, and the image still has a very high utilization value. If the original image of the spacecraft is not effectively preprocessed and transmitted efficiently, it will be difficult to ensure the image quality obtained on the ground, and it is also difficult to ensure that images of different quality levels are obtained on the ground at the same time, an...

AI Technical Summary

Problems solved by technology

[0004] For the above-mentioned first method, not only a large memory is needed, but also a very high-speed large-scale integrated circuit processing chip (FPGA and DSP, etc.), which will cause difficulties in the realization of data processing equipment on the spacecraft. Data transmission system equipment, especially space processing equipment brings a lot of pressure

For the above second method, the anti-noise ability of the block transmission will be deteriorated, and in order to improve the transmission reliability, sometimes the error correction coding technology has to be used, but it increases the amount of transmitted data

For the above third method, due to the complex processing, it will increase the complexity of the implementation on the spacecraft

In fact, due to the single event effect in space, many on-board processing devices can only be implemented with ASICs. However, due to the limited scale of ASICs, the processing devices should not be too complex and the processing speed should not be very high.

In short, none of the above three methods can simply and reliably realize the on-demand transmission and distribution of images of different quality

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