Spacecraft image decomposition and transmission method

A transmission method and spacecraft technology, applied in the field of spacecraft image transmission, can solve problems such as complex processing equipment, increased data volume, and increased spacecraft complexity, and achieve the effects of simple and reliable methods and improved anti-error performance

Active Publication Date: 2012-05-09
BEIJING SHENGAN TONGLI TECH DEV CO LTD
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  • Application Information

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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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Embodiment Construction

[0026] Such as figure 1 Shown is the principle block diagram of the spacecraft image decomposition and transmission method of the present invention. The main steps of the present invention are as follows:

[0027] (1) Format the original digital image X (size M1*N1), and fill it with the pixel gray value of adjacent rows or columns to form a digital image A of size M*N, denoted as A( i, j), i = 1, 2, ..., M, j = 1, 2, ... N, M and N are both even numbers, set the number of quantization bits per pixel as Q (generally Q = 8 ), the total number of bits of digital image A is MNQ.

[0028] (2) Decompose the digital image A (i, j) into K sub-images At (i, j), t = 1, 2, ... K, K is an even number, and K = M / L1 (K can be divisible by M) or K=N / L2 (K can divide N), L1 and L2 are positive integers greater than 1; in order to ensure that each sub-image contains the global information of the entire image before decomposition, the present invention adopts Either of the following two methods:...

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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 theoverall 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 beachieved 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 aredistributed 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 resolution of images acquired on spacecraft is getting higher and higher, and the original data rate is getting bigger and bigger, which can reach hundreds of Mbps to tens of Gbps. The image quality is getting higher and higher, the application is more and more extensive, and the users are more and more; 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 use value. Without effective preprocessing of the original image of the spacecraft and efficient transmission, it is difficult to guarantee 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N7/26H04N7/30H04N7/46H04N19/423H04N19/46H04N19/59
Inventor 周诠黄普明肖化超李敏奇张毅
Owner BEIJING SHENGAN TONGLI TECH DEV CO LTD
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