An Efficient and Fault-Tolerant Data Acquisition Method

A data collection and high-efficiency technology, applied in the direction of error prevention, digital transmission system, electrical components, etc., can solve the problems of inaccurate distinction, increase the difficulty of data collection, etc., and achieve the effect of improving performance and reducing search and sorting operations

Active Publication Date: 2017-04-05
CHINA CENT FOR RESOURCES SATELLITE DATA & APPL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Troublingly, line count transitions due to multi-segment imaging are indistinguishable from false transitions due to bit errors
Multi-segment imaging and bit errors greatly increase the difficulty of data acquisition

Method used

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  • An Efficient and Fault-Tolerant Data Acquisition Method
  • An Efficient and Fault-Tolerant Data Acquisition Method
  • An Efficient and Fault-Tolerant Data Acquisition Method

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Embodiment Construction

[0036] The data rate of high-resolution remote sensing satellites is very high. When the spatial resolution reaches the meter level, the amount of data S per second is mainly determined by the image data. The calculation formula is:

[0037]

[0038] Among them, REarth is the average radius of the earth, T is the satellite period, and the remote sensing satellite is generally about 100 minutes, δ is the satellite spatial resolution; W is the satellite width, and c is the number of quantized bytes per pixel.

[0039] The image data per second of a general high-resolution remote sensing satellite is

[0040]

[0041] In addition to satellite auxiliary data and data transmission format information, when the ground system is inputting data, if it wants to collect and decompress data at the original speed (that is, the same speed as the satellite imaging speed), it needs to receive, synchronize, and Stitch and save at least 500MB of data. At the same time, the high data rate...

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Abstract

Provided is an efficient fault-tolerant data collecting method. According to the method, large-scale data flow of a satellite is processed in an assembly line mode, and circular buffering serves as an assembly shop of an assembly line. Error codes in a satellite data transmission process can be skillfully limited within a buffering length by circular buffering, and robustness is enhanced. In addition, in the method, the uncompressing row missing circumstance in each satellite row is indicated by using bits, actual copying operation is replaced with an index row position uncompressing method, and the improvement can improve satellite data real-time processing ability to the maximum extent.

Description

technical field [0001] The invention belongs to the field of remote sensing ground processing. Background technique [0002] Nowadays, it is very common for cameras on remote sensing satellites to have a resolution of 1 meter. As the resolution increases, the pressure on the satellite data transmission system also increases significantly. In order to transmit a variety of payload data as much as possible in a limited data transmission channel, it is necessary to compress the payload data. [0003] The CCD pixel of the optical camera is as many as tens of thousands. The digital transmission system on the star divides the CCD pixel into several channels according to certain rules, and sends it to several compression encoders for compression processing at the same time, and then transmits it to the ground. On the ground, the acquisition program needs to splicing several channels of decompressed data together to form a complete data, which is called level 0 data by the ground s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/00
Inventor 李运伟喻文勇王小燕
Owner CHINA CENT FOR RESOURCES SATELLITE DATA & APPL
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