Beidou short message-based ship continuous trajectory transmission and compression method

Abstract

The present invention relates to a Beidou short message-based ship continuous trajectory transmission and compression method. According to the method, short message compression encoding rules are set;the continuous trajectories of ships far away from coasts are transmitted through using the short message function of the Beidou Satellite System. With the compression method adopted, ships of whichthe navigation speeds are under 40 knots can transmit 30 coordinate pairs per minute, that is, transmit one coordinate pair every two seconds; the navigation distance of ships of which the navigationspeeds are 20 knots is 80 meters every two seconds; the navigation distance of ships of which the navigation speeds are 40 knots is 160 meters every two second; and therefore, the authenticity of thecontinuous trajectories of the ships is improved by 15 times, transmitted coordinate sequences can truly record the continuous running trajectories of the ships, and the real-time navigation positionsof the ships can be effectively reflected when the running trajectories of the ships need to be replayed. The method has the advantages of reasonable design, simplicity, high feasibility, convenientuse, quick and effective transmission, stable and reliable performance, wide application and remarkable application effect.

Description

technical field [0001] The invention relates to a compression method for continuous track transmission of ships, in particular to a compression method for continuous track transmission of ships based on Beidou short messages. Background technique [0002] The Beidou satellite system receiver terminal can send short message information to the receiver terminal of the specified terminal number, and can also receive short messages sent by other receiver terminals; the frequency of sending short messages by civil Beidou receiver terminals is once a minute , sending a maximum of 70 bytes of information each time; the locator continuously outputs the ship’s voyage track during the ship’s navigation, forming a coordinate sequence of (time, longitude, latitude); generally, the time format of the coordinate sequence is HH: MM: SS format (8 bytes), longitude format is dddmmss.ssss format (12 bytes), latitude is ddmmss.ssss (11 bytes); the total number of coordinate pairs of each locat...

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Problems solved by technology

[0002] The Beidou satellite system receiver terminal can send short message information to the receiver terminal of the specified terminal number, and can also receive short messages sent by other receiver terminals; the frequency of sending short messages by civil Beidou receiver terminals is once a minute , sending a maximum of 70 bytes of information each time; the locator continuously outputs the ship’s voyage track during the ship’s navigation, forming a coordinate sequence of (time, longitude, latitude); generally, the time format of the coordinate sequence is HH: MM: SS format (8 bytes), longitude format is dddmmss.ssss format (12 bytes), latitude is ddmmss.ssss (11 bytes); the total number of coordinate pairs of each location information is 31 bytes ;Use the civil Beidou card to transmit at most two coordinate pairs at a time (the total number of transmitted information bytes must not exceed 70 bytes), that is, to transmit a point coordinate in 30 seconds; For a ship with a speed of 40 knots, the voyage distance in 30 seconds is 2400 meters; because the time interval of the coordinate position is too long, the distance between the ship's voyage is too large, so the ship's voyage track cannot be truly recorded, resulting in distortion of the ship's voyage route ;In real life, there are many needs to view the continuous trajectory of the ship's operation, such as: due to ship accidents and other reasons, it is necessary to track the ship's operating route. If the real trajectory cannot be recorded, it cannot be accurately played back

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