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Multi-model compressing method for transmitting general aircraft longitude and latitude position data by beidou equipment

A general-purpose aircraft and compression method technology, applied in the field of multi-model compression and decompression, can solve the problems of low compression efficiency and achieve the effect of high compression efficiency and precise monitoring

Inactive Publication Date: 2012-12-26
CHINESE AERONAUTICAL RADIO ELECTRONICS RES INST
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Problems solved by technology

[0005] After searching the existing technology, it is found that the patent "compression method for sending general aircraft latitude and longitude position data in batches", application number / patent number: 201210102422.0, this method uses predictive coding and Huffman coding technology for compression, but in Only a single model is used in the predictive coding process, and the compression efficiency is low in some cases. Therefore, the present invention uses predictive coding based on different models to further improve the compression efficiency

Method used

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  • Multi-model compressing method for transmitting general aircraft longitude and latitude position data by beidou equipment
  • Multi-model compressing method for transmitting general aircraft longitude and latitude position data by beidou equipment
  • Multi-model compressing method for transmitting general aircraft longitude and latitude position data by beidou equipment

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Embodiment

[0029] Step 1, determine the accuracy of the latitude, longitude and height data according to the actual situation, and truncate the data according to the determined accuracy requirements;

[0030] If the data is a floating-point number and the precision is M digits after the decimal point, then the M+1 digits (including M+1 digits) after the decimal point are all discarded, and the data is enlarged by 10 after truncation M converted to an integer after multiplying. Let the data used in this example be figure 1 Shown, where latitude and longitude and height data are respectively used j k ,w k , h k express. In this embodiment, the accuracy of latitude and longitude is 5 digits after the decimal point, and the accuracy of height is at the meter level, so the data after the 6th digit (including the 6th digit) after the decimal point in the latitude and longitude data can be considered unnecessary or inaccurate. to discard. After truncating, expand the longitude, latitude a...

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Abstract

The invention discloses a multi-model compressing method for transmitting general aircraft longitude and latitude position data by beidou equipment, which comprises the following steps: step 1, confirming precision of the longitudinal and latitude position data according to practical situation and truncating the data; step 2, performing predicative encoding on the data being subjected to truncation in the step 1 based on one or more than one resumptive model; step 3, performing Huffman encoding on a plurality of predicative encoding data obtained in the step 2; step 4, generating compressed data heads and compressed data volumes based on a plurality of predicative encodings obtained in the step 3 and selecting one compressed data head and one compressed data volume with minimum byte count; and step 5, uncompressing the data. According to the invention, the predicative encoding based on different models is adopted to further improve the compressing efficiency and realize precise monitoring for an aircraft.

Description

technical field [0001] The invention relates to a method in the field of information and signal processing, in particular to a multi-model compression and decompression method used for Beidou equipment to send general aircraft latitude and longitude position and altitude data in batches. Background technique [0002] With the country's strong support for the aviation industry and the urgent needs of the state and the people for general aviation applications, the general aviation market is booming. However, positioning and tracking of general aircraft is extremely important for users and management of general aircraft, and the Beidou system independently developed by my country is very suitable for positioning and tracking of general aircraft. However, the first generation of civil Beidou equipment sends information at a long interval, and the amount of data sent each time is limited. Therefore, using civil Beidou equipment to send general aircraft latitude and longitude info...

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Application Information

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IPC IPC(8): G01S19/05H03M7/40
Inventor 翟鸣施劲松刘经华张鹤
Owner CHINESE AERONAUTICAL RADIO ELECTRONICS RES INST
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