CN107592154A - Ship continuous path transmission compression method based on Big Dipper short message - Google Patents
Ship continuous path transmission compression method based on Big Dipper short message Download PDFInfo
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Abstract
The present invention relates to a kind of ship continuous path based on Big Dipper short message to transmit compression method, and the compression method realizes continuous path of the short message function transmission away from seashore ship using Beidou satellite system by the short message compression encoding rules of design.Using the compression method, navigation ship's speed, which is that the following ship of 40 sections is per minute, transmits 30 coordinate pairs, i.e., had a coordinate pair at interval of two seconds；It is 20 section ships for navigation ship's speed, 2 seconds distance to go are 80 meters, are 40 section ships for navigation ship's speed, and 2 seconds distance to go are 160 meters；15 times so are improved to the authenticity of ship continuous path, the coordinate sequence of transmission can really record the continuous running orbit of ship；Need play back vessel motion track when can be authentic and valid the real-time underway position of reflection ship.The inventive method is reasonable in design, and method is simple and easy, easy to use, and transmission is effective and rapid, stable and reliable for performance, is widely used, application effect highly significant.
Description
Technical field
The present invention relates to a kind of ship continuous path to transmit compression method, more particularly to a kind of ship based on Big Dipper short message
Oceangoing ship continuous path transmits compression method.
Background technology
Beidou satellite system receiver terminal can send short message information to the receiver terminal of designated terminal number, also can
Enough receive the short message that other receiver terminals are sent；It is transmission per minute that civilian Beidou receiver terminal, which sends short message frequency,
Once, the information of 70 bytes is at most sent every time；Ship position indicator during navigation exports ship's navigation incessantly
Track, formed (time, longitude, latitude) coordinate sequence；Generally, coordinate sequence time format is HH：MM：SS lattice
Formula (8 byte), longitude format are dddmmss.ssss forms (12 byte), and latitude is ddmmss.ssss (11 byte)；Each position
The coordinate pair total amount of byte of confidence breath is 31 bytes；At most transmit two coordinate pairs (transmission information every time using civilian Big Dipper card
Total bytes need to be not more than 70 bytes), that is, one point coordinates of transmission in 30 seconds；For navigating by water ship's speed as 20 section ships, 30 seconds
Distance to go is 1200 meters, is 40 section ships for navigation ship's speed, and 30 seconds distance to go are 2400 meters；Because between the coordinate position time
Every long, ship's navigation distance is spaced excessive, so ship ship trajectory can not be recorded really, causes ship's navigation route to lose
Very；Having in actual life much needs to check the demand of vessel motion continuous path, such as：Because the reasons such as marine incident need
Follow the trail of vessel motion course line, it is impossible to which recording real track can not then play back exactly.
Therefore, how to change the information that existing conventional meanses are transmitted vessel position, make its effective and rapid transmission ship
Navigate by water continuous path, there is provided a kind of ship continuous path transmission compression method based on Big Dipper short message, is art people
One of the problem of member should address.
The content of the invention
It is an object of the present invention to overcome the above deficiencies, there is provided a kind of application process is simple, implementation result is very aobvious
The transmission compression method of the ship continuous path based on Big Dipper short message write.
The technical solution adopted by the present invention is to achieve these goals：A kind of continuous rail of ship based on Big Dipper short message
Mark transmits compression method, it is characterised in that this method implementation steps are as follows：
Ship ship position indicator during navigation exports the track of ship's navigation incessantly, formed the time, longitude,
The coordinate sequence of latitude；Because vessel motion is not belonging to violent motion, according to different motion speed at interval of 1 second to 5 seconds
One position of record can meet routine work needs；If each second record a point, can be recorded in 1 minute 60 groups it is corresponding
Coordinate formed ship's navigation continuous path；During ship continuous path is transmitted, transmitting terminal and receiving terminal are using tool
There is the Beidou satellite system receiver of short message transfer function, and Big Dipper sim cards are configured for the terminal of transmitting terminal and receiving terminal, lead to
Cross Big Dipper sim card numbers and determine unique Beidou receiver terminal；Big Dipper short message can be with three kinds of transmission code, Chinese character, mixing letters
Cease type；It is transmitted for the present invention program using type of code, the information of type of code can preferably save short message
Memory space；
When ship Big Dipper receiving terminal machine transmitting terminal sends continuous path coordinate, the present invention program is to continuous path coordinate
Sequence carries out vacuating processing, is vacuated according to the progress of different ship's speed is different degrees of, forms new coordinate sequence；To new coordinate
During sequence compaction, always the middle time of first coordinate pair, longitude, latitude in coordinate sequence as original bench mark, are sat
Always the time of areal coordinate pair, longitude, latitude as relative datum value, calculated each two to coordinate pair behind in mark sequence in the past
The difference of adjacent coordinates pair, i.e. time difference, the difference of longitude, the difference of latitude value, form coordinate sequence of differences and recorded
And combination producing short message；Civilian Beidou receiver short message maximum length is 70 bytes, and in this scheme, Beidou receiver is short
10 bytes send the File header information of short message information, time, longitude comprising changing coordinates sequence, latitude for this before message
Reference value information is spent, data format is respectively time (time-division, accounting for 2 bytes), longitude (degree every minute and second, account for 3 bytes), latitude (degree point
Second, account for 3 bytes), another byte representation scheme categories, a byte is as reserve bytes, totally 10 bytes (being shown in Table 1)
Table 1
The type represents scheme categories, and value can be A5, A6 of 16 systems, and A5 expressions scheme one is transmitted, A6 tables
Show and transmitted with scheme two；
The benchmark longitude accounts for three bytes, and degree every minute and second respectively accounts for a byte, spend on the occasion of when represent east longitude, when being negative value
West longitude is represented, the second only records the seconds value of integer；
The latitude of reference accounts for three bytes, and degree every minute and second respectively accounts for a byte, spend on the occasion of when represent north latitude, when being negative value
South latitude is represented, the second only records the seconds value of integer；
Remaining 60 byte is used to transmit this minutes internal coordinate sequence information, and it is adjacent to calculate the coordinate sequence to be transmitted
The difference of the longitude of position and the difference of latitude value, the difference of calculating is filled up to 60 according to the compression encoding rules of design
In byte space；The following two kinds compression encoding rules are determined according to different ship's speed；
Scheme one (is shown in Table 2)
Table 2
The period represents the time simultaneously, as period 1 represents the 0th second of current base minutes, the expression of period 2 the 2nd
Second, period 3 represents that period n represents 2* (n-1) seconds the 4th second, until period 30 represents that n takes 1,2...30 the 58th second；
The L1 represents the difference of the longitude and datum mark longitude in table 1 of point 1；
The B1 represents the difference of the latitude value and datum mark latitude value in table 1 of point 1；
The L2 represents the difference of the longitude and 1 longitude of point of point 2；
The B2 represents the difference of the latitude value and 1 latitude value of point of point 2；
The L3 represents the difference of the longitude and 2 longitudes of point of point 3；
The B3 represents the difference of the latitude value and 2 latitude values of point of point 3；
The Ln represents point n longitude and the difference of point n-1 longitudes；
The Bn represents point n latitude value and the difference of point n-1 latitude values；
If ship's speed is less than 40 section, the difference of longitude takes 1 byte, and unit is 0.01 second, and 1 byte can be with table
The span shown is -128 to 128, then it represents that the difference range of longitude can meet -1.28 to 1.28 seconds, same latitude
The difference of angle value also takes 1 byte, and unit is 0.01 second, and the span that 1 byte can represent is -128 to 128, then
The difference range of the latitude value of expression can meet -1.28 to 1.28 seconds；At the earth's surface, ultimate range per second is 33 meters,
It is approximately equal to 42 meters within 1.28 seconds, equivalent to the distance in the ship course per second that ship's speed is 80 sections；Each point includes the difference of longitude
With the information of the difference of latitude value, so each point takes 2 bytes, 60 bytes can include the information of 30 points；In side
60 coordinates are vacuated in case one, the longitude and latitude difference at 0,2,4...58 seconds is only chosen and forms coordinate sequence, coordinate pair
Period in coordinate sequence has also meant that the time of the coordinate pair, as period 1 represents the 0th of current base minutes
Second, period 2 represents the 2nd second, and period 3 represents the 4th second ... until period 30 represents the 58th second；Namely ship's speed is less than 40 sections
When can use scheme one；
Or using scheme two (being shown in Table 3)：
Table 3
The period represents the time simultaneously, as period 1 represents the 0th second of current base minutes, the expression of period 2 the 4th
Second, period 3 represents that period n represents 4* (n-1) seconds the 8th second, until period 15 represents that n takes 1,2...15 the 56th second
The L1 represents the difference of the longitude and datum mark longitude in table 1 of point 1；
The B1 represents the difference of the latitude value and datum mark latitude value in table 1 of point 1；
The L2 represents the difference of the longitude and 1 longitude of point of point 2；
The B2 represents the difference of the latitude value and 1 latitude value of point of point 2；
The L3 represents the difference of the longitude and 2 longitudes of point of point 3；
The B3 represents the difference of the latitude value and 2 latitude values of point of point 3；
The Ln represents point n longitude and the difference of point n-1 longitudes；
The Bn represents point n latitude value and the difference of point n-1 latitude values；
If ship's speed is more than 40 section, the difference of longitude takes 2 bytes, and unit is 0.01 second, and 2 bytes can be with table
The span shown is -32767 to 32767, then it represents that the difference range of longitude can meet -327.67 to 327.67
Second, the difference of same latitude value also takes 2 bytes, and unit is 0.01 second, the span that 2 bytes can represent for-
32767 to 32767, then it represents that the difference range of latitude value can meet -327.67 to 327.67 seconds；It is approximately equal within 327.67 seconds
10813 meters, substantially meet any ship's speed in reality；The information comprising the difference of longitude and the difference of latitude value each is put,
So each point takes 4 bytes, 60 bytes can include the information of 15 points；To 60 point coordinates sequences in scheme two
Vacuated, only choose the longitude and latitude difference at 0,4,8...56 seconds and form coordinate sequence, point of the coordinate pair in coordinate sequence
The time of the coordinate pair number has also been meant that, as period 1 represents the 0th second of current base minutes, period 2 represents the 4th second,
Period 3 represents the 8th second ... until period 15 represents the 56th second；Scheme two can be used when namely ship's speed is more than 40 section.
The beneficial effects of the invention are as follows：
Generally, coordinate sequence time format is HH：MM：SS forms (8 byte), longitude format is
Dddmmss.ssss forms (12 byte), latitude are ddmmss.ssss (11 byte)；Each coordinate pair total amount of byte is 31 words
Section；Civilian Beidou receiver terminal sends short message frequency as the letters per minute for sending once, at most sending 70 bytes every time
Breath；But each coordinate pair needs 31 bytes to represent a positional information, two coordinate pairs are at most transmitted every time, that is,
One point coordinates of transmission in 30 seconds；It is 20 section ships for navigation ship's speed, 30 seconds distance to go are 1200 meters, are for navigation ship's speed
40 section ships, 30 seconds distance to go are 2400 meters；After using compression method of the present invention compression, navigation ship's speed is that 40 sections are following
Ship it is per minute can transmit 30 coordinate pairs, i.e., had a coordinate pair at interval of two seconds；It is 20 section ships for navigation ship's speed
Oceangoing ship, 2 seconds distance to go are 80 meters, are 40 section ships for navigation ship's speed, and 2 seconds distance to go are 160 meters；It can be sent out by comparing
Existing, the authenticity of ship continuous path improves 15 times, and the coordinate sequence of transmission really have recorded ship and continuously runs substantially
Track；Need play back vessel motion track when can be authentic and valid the real-time underway position of reflection ship.
Using the transmission compression method, in the case where not increasing other costs, the authenticity of the continuous running orbit of ship carries
It is high 15 times, need 15 identical Beidou receiver terminals if compression method transmission identical information content is not used；
Fundamentally solves the transmission problem of the continuous ship trajectory of ship.
The inventive method can equally be applied on the platform of non-ship continuous moving for being mounted with Beidou receiver terminal.
In a word, the inventive method is reasonable in design, and method is simple and easy, easy to use, and transmission is effective and rapid, and stable performance can
Lean on, be widely used, application effect highly significant.
Brief description of the drawings
Fig. 1 is application apparatus connection diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing and preferred embodiment, to according to embodiment provided by the invention, feature, details are as follows：
A kind of ship continuous path transmission compression method based on Big Dipper short message, this method implementation steps are as follows：
As shown in figure 1, the equipment connection that the present invention uses includes computer generation short message system, launch Beidou receiver
Sim1, by satellite, receive Beidou receiver sim2, computer analyzing short message system.
Ship ship position indicator during navigation exports the track of ship's navigation incessantly, formed the time, longitude,
The coordinate sequence of latitude；Because vessel motion is not belonging to violent motion, according to different motion speed at interval of 1 second to 5 seconds
One position of record can meet routine work needs；If each second record a point, can be recorded in 1 minute 60 groups it is corresponding
Coordinate formed ship's navigation continuous path；During ship continuous path is transmitted, transmitting terminal and receiving terminal are using tool
There is the Beidou satellite system receiver of short message transfer function, and Big Dipper sim cards are configured for the terminal of transmitting terminal and receiving terminal, lead to
Cross Big Dipper sim card numbers and determine unique Beidou receiver terminal；Big Dipper short message can be with three kinds of transmission code, Chinese character, mixing letters
Cease type；It is transmitted for the present invention program using type of code, the information of type of code can preferably save short message
Memory space；
When ship Big Dipper receiving terminal machine transmitting terminal sends continuous path coordinate, the present invention program is to continuous path coordinate
Sequence carries out vacuating processing, is vacuated according to the progress of different ship's speed is different degrees of, forms new coordinate sequence；To new coordinate
During sequence compaction, always using time, longitude, latitude in first coordinate pair in coordinate sequence as original bench mark, coordinate
Always the time of areal coordinate pair, longitude, latitude as relative datum value, calculated each two phase to coordinate pair behind in sequence in the past
The difference of adjacent coordinate pair, i.e. time difference, the difference of longitude, the difference of latitude value, form coordinate sequence of differences and recorded simultaneously
Combination producing short message；Civilian Beidou receiver short message maximum length is 70 bytes, in this scheme, the short report of Beidou receiver
10 bytes send the File header information of short message information, time, longitude comprising changing coordinates sequence, latitude for this before text
Reference value information, data format be respectively the time (time-division, accounting for 2 bytes), longitude (degree every minute and second, account for 3 bytes), latitude (degree every minute and second,
Account for 3 bytes), another byte representation scheme categories, a byte is as reserve bytes, totally 10 bytes (being shown in Table 1)
Table 1
The type represents scheme categories, and value can be A5, A6 of 16 systems, and A5 expressions scheme one is transmitted, A6 tables
Show and transmitted with scheme two；
The benchmark longitude accounts for three bytes, and degree every minute and second respectively accounts for a byte, spend on the occasion of when represent east longitude, when being negative value
West longitude is represented, the second only records the seconds value of integer；
The latitude of reference accounts for three bytes, and degree every minute and second respectively accounts for a byte, spend on the occasion of when represent north latitude, when being negative value
South latitude is represented, the second only records the seconds value of integer；
Remaining 60 byte is used to transmit this minutes internal coordinate sequence information, and it is adjacent to calculate the coordinate sequence to be transmitted
The difference of the longitude of position and the difference of latitude value, the difference of calculating is filled up to 60 according to the compression encoding rules of design
In byte space；The following two kinds compression encoding rules are determined according to different ship's speed；
Scheme one (is shown in Table 2)
Table 2
The period represents the time simultaneously, as period 1 represents the 0th second of current base minutes, the expression of period 2 the 2nd
Second, period 3 represents that period n represents 2* (n-1) seconds the 4th second, until period 30 represents that n takes 1,2...30 the 58th second；
The L1 represents the difference of the longitude and datum mark longitude in table 1 of point 1；
The B1 represents the difference of the latitude value and datum mark latitude value in table 1 of point 1；
The L2 represents the difference of the longitude and 1 longitude of point of point 2；
The B2 represents the difference of the latitude value and 1 latitude value of point of point 2；
The L3 represents the difference of the longitude and 2 longitudes of point of point 3；
The B3 represents the difference of the latitude value and 2 latitude values of point of point 3；
The Ln represents point n longitude and the difference of point n-1 longitudes；
The Bn represents point n latitude value and the difference of point n-1 latitude values；
If ship's speed is less than 40 section, the difference of longitude takes 1 byte, and unit is 0.01 second, and 1 byte can be with table
The span shown is -128 to 128, then it represents that the difference range of longitude can meet -1.28 to 1.28 seconds, same latitude
The difference of angle value also takes 1 byte, and unit is 0.01 second, and the span that 1 byte can represent is -128 to 128, then
The difference range of the latitude value of expression can meet -1.28 to 1.28 seconds；At the earth's surface, ultimate range per second is 33 meters,
It is approximately equal to 42 meters within 1.28 seconds, equivalent to the distance in the ship course per second that ship's speed is 80 sections；Each point includes the difference of longitude
With the information of the difference of latitude value, so each point takes 2 bytes, 60 bytes can include the information of 30 points；In side
60 coordinates are vacuated in case one, the longitude and latitude difference at 0,2,4...58 seconds is only chosen and forms coordinate sequence, coordinate pair
Period in coordinate sequence has also meant that the time of the coordinate pair, as period 1 represents the 0th of current base minutes
Second, period 2 represents the 2nd second, and period 3 represents the 4th second ... until period 30 represents the 58th second；Namely ship's speed is less than 40 sections
When can use scheme one；
Or using scheme two (being shown in Table 3)：
Table 3
The period represents the time simultaneously, as period 1 represents the 0th second of current base minutes, the expression of period 2 the 4th
Second, period 3 represents that period n represents 4* (n-1) seconds the 8th second, until period 15 represents that n takes 1,2...15 the 56th second
The L1 represents the difference of the longitude and datum mark longitude in table 1 of point 1；
The B1 represents the difference of the latitude value and datum mark latitude value in table 1 of point 1；
The L2 represents the difference of the longitude and 1 longitude of point of point 2；
The B2 represents the difference of the latitude value and 1 latitude value of point of point 2；
The L3 represents the difference of the longitude and 2 longitudes of point of point 3；
The B3 represents the difference of the latitude value and 2 latitude values of point of point 3；
The Ln represents point n longitude and the difference of point n-1 longitudes；
The Bn represents point n latitude value and the difference of point n-1 latitude values；
If ship's speed is more than 40 section, the difference of longitude takes 2 bytes, and unit is 0.01 second, and 2 bytes can be with table
The span shown is -32767 to 32767, then it represents that the difference range of longitude can meet -327.67 to 327.67
Second, the difference of same latitude value also takes 2 bytes, unit is 0.01 second, the span that 2 bytes can represent for-
32767 to 32767, then it represents that the difference range of latitude value can meet -327.67 to 327.67 seconds；It is approximately equal within 327.67 seconds
10813 meters, substantially meet any ship's speed in reality；The information comprising the difference of longitude and the difference of latitude value each is put,
So each point takes 4 bytes, 60 bytes can include the information of 15 points；To 60 point coordinates sequences in scheme two
Vacuated, only choose the longitude and latitude difference at 0,4,8...56 seconds and form coordinate sequence, point of the coordinate pair in coordinate sequence
The time of the coordinate pair number has also been meant that, as period 1 represents the 0th second of current base minutes, period 2 represents the 4th second,
Period 3 represents the 8th second ... until period 15 represents the 56th second；Scheme two can be used when namely ship's speed is more than 40 section.
Specific implementation step and operation principle of the present invention：
The present invention designs certain short message coding rule, realization utilizes big-dipper satellite system by certain compression method
Continuous path of the short message function transmission away from seashore ship of system.
Following table is the ship continuous path coordinate of one minute of ship position indicator 13 points of outputs per second in 50 minutes one day once：
Shipping sail speed is less than 40 sections, carries out coding compression according to rule according to scheme one, only chooses 0,2,4...58
Longitude and latitude at second forms coordinate sequence：
The value of each byte of short message file header is calculated according to the coding rule of short message：
Ship's speed is less than 40 sections, and the information category of byte 0 is A5；
The longitude of first point be 117 degree 57.93405 seconds 43 minutes, byte 1, byte 2, byte 3 are respectively that first point passes through
The degree every minute and second of angle value, i.e.,：117th, 43,57 (second round numbers part)；The latitude of first point be 38 degree 59 minutes 19.763928
Second, byte 4, byte 5, byte 6 are respectively the degree every minute and second of the first latitude value, i.e.,：38th, 59,19 (second round numbers part)；
The first time be 13 points 50 minutes, byte 7, the time-division that byte 8 is the first time, i.e.,：13、50.Obtained numerical value
Filled according to table 1, that is, obtain the File header information of short message, it is as follows：
The information of short message is calculated again, and 0 obtained according to scheme one, the longitude and latitude difference at 2,4...58 seconds forms coordinate
Sequence, position (period) of the coordinate pair in coordinate sequence have also meant that the time of the coordinate pair, ultimately form the seat of following table
Mark sequence：
According to upper table result of calculation, the difference of the latitude and longitude value of 30 points is filled up in 60 bytes, n-th point (n takes
0th, 1,2,3...29) the difference of longitude and the difference of latitude value be individually placed to the positions of 2n and 2n+1 bytes, be formed such as
Lower short message information：
| Byte 0 | Byte 1 | Byte 2 | Byte 3 | Byte 4 | Byte 5 | Byte 6 | Byte 7 | Byte 8 | Byte 9 |
| 93 | 76 | -20 | 75 | -20 | 74 | -20 | 74 | -20 | 82 |
| Byte 10 | Byte 11 | Byte 12 | Byte 13 | Byte 14 | Byte 15 | Byte 16 | Byte 17 | Byte 18 | Byte 19 |
| -20 | 83 | -19 | 83 | -19 | 80 | -19 | 80 | -19 | 84 |
| Byte 20 | Byte 21 | Byte 22 | Byte 23 | Byte 24 | Byte 25 | Byte 26 | Byte 27 | Byte 28 | Byte 29 |
| -19 | 86 | -19 | 90 | -19 | 93 | -19 | 95 | -19 | 92 |
| Byte 30 | Byte 31 | Byte 32 | Byte 33 | Byte 34 | Byte 35 | Byte 36 | Byte 37 | Byte 38 | Byte 39 |
| -19 | 93 | -19 | 92 | -19 | 91 | -19 | 93 | -20 | 90 |
| Byte 40 | Byte 41 | Byte 42 | Byte 43 | Byte 44 | Byte 45 | Byte 46 | Byte 47 | Byte 48 | Byte 49 |
| -20 | 86 | -20 | 84 | -20 | 81 | -20 | 90 | -20 | 80 |
| Byte 50 | Byte 51 | Byte 52 | Byte 53 | Byte 54 | Byte 55 | Byte 56 | Byte 57 | Byte 58 | Byte 59 |
| -20 | 75 | -20 | 75 | -20 | 76 | -20 | 77 | -20 | 78 |
10 bytes of file header link together with 60 bytes of coordinate difference information and are formed 1 point of 70 bytes
The continuous path of the ship's navigation of clock, it is whole that this 70 bytes can once be sent to the Big Dipper specified by Big Dipper terminal receiver
Terminal.
The inverse process that Beidou receiver terminal receives after short message information according still further to scheme one parses the short message of compression
Information obtains (time, longitude, latitude) coordinate sequence of the continuous path of ship's navigation.
It is more than the ship of 40 sections for ship's speed, transmitting terminal Big Dipper terminating machine part can be equally compressed according to scheme two
Ship's navigation trajectory coordinates sequence, the short message information of receiving terminal Beidou receiver terminal part parsing compression obtain ship's navigation
Continuous path (time, longitude, latitude) coordinate sequence.
It is above-mentioned that the detailed of compression method progress is transmitted to the ship continuous path based on Big Dipper short message with reference to embodiment
Description, is illustrative rather than limited；This method is equally applicable to the continuous path transmission compression of other mobile platforms；
Therefore changing and modifications in the case where not departing from present general inventive concept, should belong within protection scope of the present invention.
Claims (1)
1. a kind of ship continuous path transmission compression method based on Big Dipper short message, it is characterised in that this method implementation steps are such as
Under：Ship ship position indicator during navigation exports the track of ship's navigation incessantly, forms time, longitude, latitude
Coordinate sequence；Because vessel motion is not belonging to violent motion, recorded according to different motion speed at interval of 1 second to 5 seconds
One position can meet routine work needs；If each second records a point, 60 groups can be recorded in 1 minute and is sat accordingly
Mark forms the continuous path of ship's navigation；During ship continuous path is transmitted, transmitting terminal and receiving terminal are short using having
The Beidou satellite system receiver of message transmissions function, and Big Dipper sim cards are configured for the terminal of transmitting terminal and receiving terminal, pass through north
Bucket sim card numbers determine unique Beidou receiver terminal；Big Dipper short message can be with three kinds of transmission code, Chinese character, mixing info class
Type；It is transmitted for the present invention program using type of code, the information of type of code can preferably save short message storage
Space；
When ship Big Dipper receiving terminal machine transmitting terminal sends continuous path coordinate, the present invention program is to continuous path coordinate sequence
Carry out vacuating processing, vacuated according to the progress of different ship's speed is different degrees of, form new coordinate sequence；To new coordinate sequence
In compression process, always using the time of first coordinate pair, longitude, latitude in coordinate sequence as original bench mark, coordinate sequence
In behind coordinate pair always before time of areal coordinate pair, longitude, latitude be used as relative datum value, the adjacent seat of calculating each two
The difference of mark pair, i.e. time difference, the difference of longitude, the difference of latitude value, form coordinate sequence of differences and recorded and combined
Generate short message；Civilian Beidou receiver short message maximum length is 70 bytes, in this scheme, before Beidou receiver short message
10 bytes is the File header informations of this transmission short message information, time, longitude, latitude benchmark comprising changing coordinates sequence
Value information, data format is respectively time (time-division, accounting for 2 bytes), longitude (degree every minute and second, account for 3 bytes), (degree every minute and second, accounts for 3 to latitude
Byte), another byte representation scheme categories, a byte is as reserve bytes, totally 10 bytes (being shown in Table 1)
Table 1
The type represents scheme categories, and value can be A5, A6 of 16 systems, and A5 expressions scheme one is transmitted, and A6 represents to use
Scheme two is transmitted；
The benchmark longitude accounts for three bytes, and degree every minute and second respectively accounts for a byte, spend on the occasion of when represent east longitude, represented when being negative value
West longitude, second only record the seconds value of integer；
The latitude of reference accounts for three bytes, and degree every minute and second respectively accounts for a byte, spend on the occasion of when represent north latitude, represented when being negative value
South latitude, second only record the seconds value of integer；
60 bytes are used to transmit this minutes internal coordinate sequence information, calculate the warp of the coordinate sequence adjacent position to be transmitted
The difference of angle value and the difference of latitude value, the difference of calculating is filled up to 60 byte spaces according to the compression encoding rules of design
It is interior；The following two kinds compression encoding rules are determined according to different ship's speed；
Scheme one (is shown in Table 2)
Table 2
The period represents the time simultaneously, as period 1 represents the 0th second of current base minutes, the expression of period 2 the 2nd second, point
Numbers 3 represent that period n represents 2* (n-1) seconds the 4th second, until period 30 represents that n takes 1,2...30 the 58th second；
The L1 represents the difference of the longitude and datum mark longitude in table 1 of point 1；
The B1 represents the difference of the latitude value and datum mark latitude value in table 1 of point 1；
The L2 represents the difference of the longitude and 1 longitude of point of point 2；
The B2 represents the difference of the latitude value and 1 latitude value of point of point 2；
The L3 represents the difference of the longitude and 2 longitudes of point of point 3；
The B3 represents the difference of the latitude value and 2 latitude values of point of point 3；
The Ln represents point n longitude and the difference of point n-1 longitudes；
The Bn represents point n latitude value and the difference of point n-1 latitude values；
If ship's speed is less than 40 section, the difference of longitude takes 1 byte, and unit is 0.01 second, what 1 byte can represent
Span is -128 to 128, then it represents that the difference range of longitude can meet -1.28 to 1.28 seconds, same latitude value
Difference also take 1 byte, unit is 0.01 second, and the span that 1 byte can represent is -128 to 128, then it represents that
The difference range of latitude value can meet -1.28 to 1.28 seconds；At the earth's surface, ultimate range per second is 33 meters, 1.28 seconds
It is approximately equal to 42 meters, equivalent to the distance in the ship course per second that ship's speed is 80 sections；Each point includes the difference and latitude of longitude
The information of the difference of value, so each point takes 2 bytes, 60 bytes can include the information of 30 points；In scheme one
60 coordinates are vacuated, the longitude and latitude difference at 0,2,4...58 seconds is only chosen and forms coordinate sequence, coordinate pair is in coordinate
Period in sequence has also meant that the time of the coordinate pair, as period 1 represents the 0th second of current base minutes, period 2
Represent the 2nd second, period 3 represents the 4th second ... until period 30 represents the 58th second；It can be adopted when namely ship's speed is less than 40 section
With scheme one；
Or using scheme two (being shown in Table 3)：
Table 3
The period represents the time simultaneously, as period 1 represents the 0th second of current base minutes, the expression of period 2 the 4th second, point
Numbers 3 represent that period n represents 4* (n-1) seconds the 8th second, until period 15 represents that n takes 1,2...15 the 56th second；
The L1 represents the difference of the longitude and datum mark longitude in table 1 of point 1；
The B1 represents the difference of the latitude value and datum mark latitude value in table 1 of point 1；
The L2 represents the difference of the longitude and 1 longitude of point of point 2；
The B2 represents the difference of the latitude value and 1 latitude value of point of point 2；
The L3 represents the difference of the longitude and 2 longitudes of point of point 3；
The B3 represents the difference of the latitude value and 2 latitude values of point of point 3；
The Ln represents point n longitude and the difference of point n-1 longitudes；
The Bn represents point n latitude value and the difference of point n-1 latitude values；
If ship's speed is more than 40 section, the difference of longitude takes 2 bytes, and unit is 0.01 second, what 2 bytes can represent
Span is -32767 to 32767, then it represents that the difference range of longitude can meet -327.67 to 327.67 seconds, together
The difference of sample latitude value also takes 2 bytes, and unit is 0.01 second, the span that 2 bytes can represent be -32767 to
32767, then it represents that the difference range of latitude value can meet -327.67 to 327.67 seconds；327.67 the second is approximately equal to 10813
Rice, substantially meets any ship's speed in reality；The information comprising the difference of longitude and the difference of latitude value each is put, so often
Individual point takes 4 bytes, and 60 bytes can include the information of 15 points；60 point coordinates sequences are taken out in scheme two
It is dilute, the longitude and latitude difference formation coordinate sequence at 0,4,8...56 seconds place is only chosen, period of the coordinate pair in coordinate sequence is also
The time of the coordinate pair is illustrated, as period 1 represents the 0th second of current base minutes, the expression of period 2 the 4th second, period 3
Represent the 8th second ... until period 15 represents the 56th second；Scheme two can be used when namely ship's speed is more than 40 section.
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