CN104202078B - Satellite mobile communication system subscriber's data transmission method and system - Google Patents
Satellite mobile communication system subscriber's data transmission method and system Download PDFInfo
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Abstract
The invention discloses a kind of satellite mobile communication system subscriber's data transmission method and system, and wherein this method is that tracking data is filled into signaling message by mobile satellite communication terminal, and ground monitoring terminal is transferred to by the signaling channel of satellite.System includes satellite, ground monitoring terminal, ground satellite station, mobile satellite communication terminal, and ground monitoring terminal includes：Tracking data receiving module, data resolution module, tracking data display module, control instruction sending module；Mobile satellite communication terminal includes：Tracking data collector；The tracking data group bag module to be packaged to the tracking data of collection；The tracking data compression module of data after compression group bag, the signaling group bag module being filled into the tracking data after compression in signaling message；Send the signal dispatcher module of tracking data and control instruction.The present invention is not take up Traffic Channel and requires no the charge system of Virtual network operator, realizes remote tracing function.
Description
Technical field
The present invention relates to technical field of satellite communication, in particular it relates to which a kind of satellite mobile communication system subscriber's data pass
Transmission method and system.
Background technology
Satellite communication is the product of modern communicationses, and its major function is to fill up existing communication (wire communication, radio communication)
The region that terminal can not cover, more sound service is provided for the work of people.
In recent years, with the continuous lifting and resulting shipping safety and shipping of shipping status in communications and transportation
The needs of management so that ship tracking monitoring system increasingly becomes focus of concern.Real-time tracking to ship is ship
The important component of oceangoing ship monitoring system.In coastal waters, can by coastal station and it is land communicated, but arrived boundless and indistinct nothing
On the ocean on border, coastal station just loses effect, now, can only rely on satellite communication.Satellite communication is used for ship and ship
Between, the communication between ship and land, can be conversed, data transfer, fax, navigator fix etc..Set by satellite communication
It is standby, the travel route of ship, position, speed, height etc. can be tracked at any time, and these information transmissions to control centre.
For numerous industries such as ocean shipping industry, fishing in open sea industry, transnational logistics and other have special dispatch control will
The unit asked, there is an urgent need to carry out Distant supervision and control to fleet, currently used mode is to use satellite mobile communication system
Unite to transmit remote tracing information.
In order to realize remote real-time monitoring, usual satellite communication equipment is tracked by TCH (Traffic Channel) periodically transmission
Data, these huge data volumes do not only take up the communication bandwidth of satellite network, increase satellite network burden, cause satellite network
Hydraulic performance decline, so satellite operator company can collect the high communication cost of user, for large ship carrier, this
A little communication costs are very surprising.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of satellite mobile communication system subscriber's data transmission method, should
Method can solve satellite network hydraulic performance decline caused by frequently sending tracking data using satellite signaling channel transmission user data
The problem of over-burden with user's communication cost.Present invention also offers a kind of satellite mobile communication system subscriber's data transmission system
System.
Technical scheme is used by the present invention solves the above problems：
Satellite mobile communication system subscriber's data transmission method, tracking data is filled into signaling message, passes through satellite
Signaling channel be transferred to ground monitoring terminal.
Further, the tracking data is filled in the Optional Field of signaling message.
As a further improvement on the present invention, above-mentioned satellite mobile communication system subscriber's data transmission method specifically include with
Lower step：
The tracking data preserved when reading last time shutdown after S1, mobile satellite communication terminal start sends the cycle, and should
Cycle set is that this tracking data sends the cycle；
S2, waited into idle condition, sending the cycle according to tracking data judges whether arrive tracking data transmission
Time, and monitor the control instruction for whether receiving the transmission of ground monitoring terminal；The time is sent if arrived, jumps to step S3；
Step S5 is jumped to if control instruction is received；Continue waiting for and protect if not arriving the transmission time and not receiving control instruction
Hold monitoring；Judge whether that having arrived tracking data sends the time in this step, it can be determined that branch office's data transmitting period setting is determined
When device it is whether overtime, it is overtime then represent to have arrived tracking data and send the time, it is on the contrary then do not arrive；
S3, tracking data is filled into signaling message；
S4, the signaling message that tracking data is filled with step S3 is transmitted by signaling channel, jumps to step
S2；
S5, parsing simultaneously perform control instruction, and step S2 is jumped to after having performed.
Further, in step S3, processing is also compressed to tracking data first, the length of tracking data is equal to signaling
The length of Optional Field in message, the tracking data after then compression is handled again are filled into signaling message.
Further, step S5 comprises the following steps：
S51, determine whether that change sends the instruction in cycle, be to jump to step S52, otherwise jump to step S53；
S52, the cycle for being changed to specify in control instruction by the currently transmitted cycle, jump to step S2；
S53, other instructions are performed, step S2 is jumped to after having performed.
Further, the monitor command of the ground monitoring terminal is also filled into signaling message and believed by the signaling of satellite
Road is transferred to mobile satellite communication terminal.
Satellite mobile communication system subscriber's data transmission system, including for providing the satellite of satellite communication network, being used for
Receive tracking data and send the ground monitoring terminal of control instruction, in mobile satellite communication terminal and ground monitoring terminal
Between carry out data forwarding ground satellite station, for gather and send tracking data and receive and perform control instruction movement
Satellite communication terminal,
The ground monitoring terminal includes：
Tracking data receiving module, for receiving tracking data；
Tracking data parsing module, for parsing tracking data；
Tracking data display module, for the tracking data after parsing to be shown into user；
Control instruction sending module, for sending control instruction to mobile satellite communication terminal；
The mobile satellite communication terminal includes：
Tracking data collector, for gathering tracking data；
Tracking data group bag module, for being packaged to the tracking data of collection；
Tracking data compression module, for the tracking data after compression group bag, the length of tracking data is set to be less than signaling report
The Optional Field length of text；
Signaling group bag module, for the tracking data after compression to be filled into the Optional Field in signaling message；
Signal dispatcher module, for sending tracking data and receiving control instruction.
Further, the mobile satellite communication terminal also includes：
Control instruction parsing module, for parsing control instruction；
Control instruction execution module, for performing the control instruction after parsing.
To sum up, the beneficial effects of the invention are as follows：
1st, the present invention realizes remote tracing function, has expanded the application field of equipment, realizes maritime satellite communications end
The remote monitoring at end, the functions such as emergency, remote measuring and controlling are tracked, solve remote districts or ship remotely unmanageable problem.
2nd, tracking data is filled into signaling channel by the present invention is sent to user, is not take up Traffic Channel and without warp
The charge system of Virtual network operator is crossed, solves satellite network hydraulic performance decline caused by frequently sending tracking data in the prior art
The problem of over-burden with user's communication cost, ensure satellite network performance, reduce customer using cost.
3rd, the present invention is transmitted after tracking data is compressed, and the data content of transmission is more.
Brief description of the drawings
Fig. 1 is the flow chart of the method for the present invention；
Fig. 2 is the structural representation of the system of the present invention；
Fig. 3 is a kind of coded system schematic diagram in embodiment 2.
Embodiment
For numerous industries such as ocean shipping industry, fishing in open sea industry, logistics and other have special dispatch control requirement
Unit, there is an urgent need to carry out Distant supervision and control to fleet.In order to meet user's request, original solution method mode is：
Purchase one is needed to be used for communication equipment and the equipment for being used for tracking, tracking equipment needs to pay high expense every year,
By most wide data terminal is used in the market, the tracking expense that domestic annual single device need to be paid probably is 3000 people
Coin or so.For huge fleet company, the disbursement every year in remote tracing service is surprising.In addition, usual satellite
Equipment transmits tracking data using Traffic Channel, and Traffic Channel is generally used for transmitting the information such as speech, if Traffic Channel is occupied,
Easily there is TCH (Traffic Channel) channel congestion, call drop phenomenon easily occurs in user.In order to solve the above problems, the present invention provides
A kind of satellite mobile communication system subscriber's data transmission method and system, tracking data is filled into signaling channel and is sent to
User, it is not take up Traffic Channel and requires no the charge system of Virtual network operator, ensures satellite network performance, reduces user
Use cost.The present invention will now be described in further detail with reference to the accompanying drawings and the accompanying drawings, but embodiments of the present invention
Not limited to this.
【Embodiment 1】
As shown in Fig. 2 satellite mobile communication system subscriber's data transmission system, including satellite, ground satellite station, ground prison
Control terminal and the mobile satellite communication terminal on ship, wherein：
Satellite is used to provide satellite communication network；Ground satellite station, in mobile satellite communication terminal and ground monitoring
Data forwarding is carried out between terminal, is connected by satellite communication network with mobile satellite communication terminal；Ground monitoring terminal is used for
Receive tracking data and to mobile satellite communication terminal send control instruction, mobile satellite communication terminal be used for gather and send with
Track data and reception and execution control instruction.
The ground monitoring terminal includes：
Tracking data receiving module, for receiving tracking data from ground satellite station；
Tracking data parsing module, for parsing the tracking data received；
Tracking data display module, for the tracking data after parsing to be shown into user；
Control instruction sending module, for sending control instruction to mobile satellite communication terminal；
The mobile satellite communication terminal includes：
Tracking data collector, for gathering tracking data；
Tracking data group bag module, for being packaged to the tracking data of collection；
Tracking data compression module, for the tracking data after compression group bag, the length of tracking data is set to be less than signaling report
The Optional Field length of text；
Signaling group bag module, for the tracking data after compression to be filled into the Optional Field in signaling message；
Signal dispatcher module, for sending tracking data by satellite communication network and receiving control instruction；
Control instruction parsing module, for parsing control instruction；
Control instruction execution module, for performing the control instruction after parsing.
As shown in figure 1, satellite mobile communication system subscriber's data transmission method, comprises the following steps：
The tracking data preserved when reading last time shutdown after S1, mobile satellite communication terminal start sends the cycle, and should
Cycle set is that this tracking data sends the cycle；
S2, mobile satellite communication terminal are waited into idle condition, are judged whether according to the tracking data transmission cycle
Arrive tracking data and sent the time, and monitor the control instruction for whether receiving the transmission of ground monitoring terminal；If to when sending
Between, jump to step S3；Step S5 is jumped to if control instruction is received；Refer to if not arriving to send the time and do not receive control
Order then continues waiting for and keeps monitoring；In this step, the time is sent if arrived, down trigger is produced, jumps to step S3；
The time is sent if do not arrived, does not produce down trigger, equipment is then constantly in idle condition；Equally, if receiving control instruction,
Gateway is the interruption that signal dispatcher module produces control instruction, carries out down trigger, step S5 is jumped to, if not receiving net
The interruption for the control instruction sent is closed, mobile satellite communication terminal is constantly in idle condition；
Step S3：Tracking data is filled into signaling message, specifically：Tracking data is filled into L3 layers, and (network should
With layer) signaling message in, in the present embodiment, signaling format is as shown in the table：
Wherein, from left to right, " protocol type " field is used for showing call control (the calling controls that this message is L3 layers
System) sublayer message, take 1/2 byte；" TI " field is Transaction Identifier (transaction identifier), takes 1/
2 bytes, " type of message " field be used for distinguish be call control sublayers specific type of message, take 1 byte；" hold
The channel parameter configuration of load business " field, is mainly used in setting the channel parameter for carrying the business, takes 7 bytes；" tracking
Data content " field takes 10 bytes, it is necessary to which the tracking data for issuing ground monitoring terminal is filled into the field of 10 bytes
It is interior；
Step S4：After tracking data is filled into signaling message, it is transmitted by signaling channel, specifically：Track number
After being filled into signaling message, satellite mobile communication terminal initiates an active call process, and calling enters dedicated channel
(SDCCH) after, the signaling message for including tracking data is sent by SDCCH channels, after transmission terminates, terminates meeting
Words, jump to step S2, return to idle condition；
S5, parsing simultaneously perform control instruction, and step S5 is jumped to after having performed.
Wherein, step S5 comprises the following steps：
S51, determine whether that change sends the instruction in cycle, be to jump to step S52, otherwise jump to step S53；
S52, the cycle for being changed to specify in control instruction by the currently transmitted cycle, jump to step S2；
S53, other instructions are performed, step S2 is jumped to after having performed.
In addition, the monitor command of the ground monitoring terminal can be also filled into called signaling message by the letter of satellite
Signaling channel is transferred to mobile satellite communication terminal.
There are the Optional Field of certain length, generally 10 bytes, the present embodiment in maritime satellite system signaling message
In, the positional information for the ship that the mobile satellite communication terminal on ship will transmit, temporal information, the navigation shape of ship
The tracking informations such as state, speed are filled into 10 byte spaces of signaling message and transmitted, so can not only be real-time by tracking data
The network-side of the monitoring of reception is sent to, and this transmission mode needs not move through Traffic Channel, reduces to Traffic Channel
Take, ensure the performance of satellite communication network；Without the charge system by Virtual network operator, any expense will not be produced
With.The control command of ground monitor terminal can also be sent to the mobile satellite communication end of ship by being called signaling method simultaneously
End, this process also without the charge system of satellite network, will not equally produce expense.
【Embodiment 2】
On the basis of embodiment 1, processing is also compressed to tracking data first in the step S3 of the present embodiment, make with
The length of track data is equal to the length of Optional Field in signaling message, and the tracking data after then compression is handled again is filled into letter
Make in message, the data of such single transmission are more.
The tracking data including sail informations such as current latitude and longitude information, the speed of a ship or plane, courses is subjected to group in the present embodiment
Bag, compression, make tracking data length be equal to signaling message in Optional Field length, below using group bag before data length as
11 bytes (22 numerals), the data length after compression processing track number to provide one kind exemplified by 10 bytes (20 numerals)
It is as follows according to the specific processing method for being compressed processing：
Step S31：The longitude in home position and the form of latitude degree of being converted into every minute and second will be represented, and by longitude and latitude
Migration processing is carried out, the positional information after skew is compiled into 22 numeral groups and wrapped, position data b1~b22 of composition, wherein
B1 represents type of message, and b2~b8 is followed successively by the degree of longitude, minute, second, and b9~b15 is followed successively by the degree of latitude, minute, second, b16~
B18 is speed, and b19~b21 is course, and b22 is significance bit；
Step S32：Remove type of message b1 temporarily, obtain position data b2~b22 of 21 numeral compositions；
Step S33：The position data of 21 numeral compositions to being obtained in step S32 encodes, and removes two after coding
The numeral at end, retain 19 numerals of centre, so as to the position data after being encoded；Calculated as a result of specific coding
Method, although eliminating two numerals at both ends herein, only retain middle 19 numerals, can be used in receiving terminal corresponding
Decoding algorithm calculates the numeral at both ends, therefore the two numerals may not necessarily transmit, and saves space；
Step S34：The type of message b1 removed is supplemented in come, 19 numbers obtained in type of message b1 and step S33
Word constitutes the content of 10 bytes after compression, and these classes are held to the Optional Field for 10 bytes for being filled into signaling message
In, jump in step S4 and be transmitted.
Below, above-mentioned implementation process is illustrated with reference to specific example, is illustrated in figure 3 the encoded of the present invention
Journey schematic diagram, it is decoding process schematic diagram to also serve as, first, it is specified that longitude in step S31 after migration processing
Scope with latitude is 0~69 ° 59 ' 59.9 ", it is assumed that the offset of longitude is Long_Offset, and the offset of latitude is Lat_
Offset, the longitude in home position are expressed as ddd ° of mm ' ss.s ", and the latitude in home position is expressed as ddd ° of mm ' ss.s "；According to
The offset of longitude and latitude, the longitude after being offset are (ddd ± Long_Offset) ° mm ' ss.s ", the latitude after skew
For (ddd ± Lat_Offset) ° mm ' ss.s ", here, ddd ± Long_Offset and ddd ± Lat_Offset maximum are just
The maximum for being 69, mm is exactly that 59, ss.s maximum is exactly 59.9.In addition, the numeral being related in the present invention is positive number, and
It is east longitude or west longitude, north latitude or south latitude on earth to distinguish original positional information, provides east longitude for just in the present embodiment
Number, west longitude are negative, north latitude is positive number, south latitude is negative, although the positional information so drawn may have negative, longitude and latitude
Degree may also be more than 69 ° 59 ' 59.9 ", but after being handled by offset, the longitude for the position data being able to ensure that all the time before coding
And latitude is between 0~69 ° 59 ' 59.9 ", i.e. 0≤ddd ± Long_Offset≤69,0≤ddd ± Lat_Offset≤69.
Certainly, to ensure that different positions has different offsets through spending with latitude in 0~69 ° 59 ' 59.9 " after offseting,
Provided in the present embodiment：
When actual longitude is in -180 ° 0 ' 0 " to -110 ° 0 ' 1 ", offset Long_Offset is 180 ° 0 ' 0 ", so real
Border precision is just interior at 0~69 ° 59 ' 59.9 " plus offset,
Similarly：
When actual longitude is in -110 ° 0 ' 0 " to -40 ° 0 ' 1 ", offset Long_Offset is 110 ° 0 ' 0 ",
When actual longitude is in -40 ° 0 ' 0 " to -0 ° 0 ' 1 ", offset Long_Offset is 40 ° 0 ' 0 ",
When actual longitude is in 0 ° 0 ' 0 " to 69 ° 59 ' 59 ", offset Long_Offset is 0 ° 0 ' 0 ",
When actual longitude is in 70 ° 0 ' 0 " to 139 ° 59 ' 59 ", offset Long_Offset is -70 ° 0 ' 0 ",
When actual longitude is in 140 ° 0 ' 0 " to 180 ° 0 ' 0 ", offset Long_Offset is -140 ° 0 ' 0 ",
When actual latitude is in -90 ° 0 ' 0 " to -20 ° 0 ' 1 ", offset Lat_Offset is 90 ° 0 ' 0 ",
When actual latitude is in -20 ° 0 ' 0 " to -0 ° 0 ' 1 ", offset Lat_Offset is 20 ° 0 ' 0 ",
When actual latitude is in 0 ° 0 ' 0 " to 69 ° 59 ' 59 ", offset Lat_Offset is 0 ° 0 ' 0 ",
When actual latitude is in 70 ° 0 ' 0 " to 90 ° 0 ' 0 ", offset Lat_Offset is -70 ° 0 ' 0 ",
It is above-mentioned on the occasion of representing east longitude, north latitude, negative value represents west longitude, south latitude, it can be seen that in the world only at 5
Longitude station converts offset, converts offsets in 4 Position Latitudes, and the traveling of ship is generally relatively slow and position connects
Continuous change, therefore do not have to moment transmission deviation amount, it is only necessary to reach it is above-mentioned need conversion offset position when, mobile-satellite leads to
Believe terminal notification ground monitoring terminal change offset, thus in tracking data need not transmission deviation amount, the offset can
To inform ground monitoring terminal using other modes.The setting of above-mentioned offset is only a kind of embodiment, practical application
In, other offset methods to set up to match with longitude, latitude can also be used, are not limited in above-mentioned set-up mode.
Below it is assumed that position data b2~b22 after migration processing is 695959969595999993991, now
The longitude and latitude of position are maximum.Followed by specific cataloged procedure：
Step 331：B6=b4*6+b6,
If b6 >=10, b4=(int) (b6/10), b6=b6%10；
If b6 ＜ 10, b4=0, b6=b6；
Thus b4=3, b6=5 are drawn；
B13=b11*6+b13,
If b13 >=10, b11=(int) (b13/10), b13=b13%10；
If b13 ＜ 10, b11=0, b13=b13；
Thus b11=3, b13=5 are drawn；
B22=b19*2+b22, b19=b22；Thus b19=7 is drawn；
Step 332：B11=b4*4+b11,
If b11 >=10, b4=(int) (b11/10), b11=b11%10；
If b11 ＜ 10, b4=0, b11=b11；
Thus b4=1, b11=5 are drawn；
Step 333：B9=b2*7+b9,
If b9 >=10, b2=(int) (b9/10), b9=b9%10；
If b9 ＜ 10, b2=0, b9=b9；
Thus b2=4, b9=8 are drawn；
Step 334：B4=b2*2+b4；Thus b4=9 is drawn；
Step 335：Obtaining new data b2~b22, b2~b22 by step 331~step 334 is
499959989595999997991, b3~b21 is assigned to a2~a20 successively, a2~a20 is the data after encoding, a2~
A20 is that 9995998959599999799, a1=b1, b1 is known.So, a1~a20 constitutes the content of 10 bytes,
A1~a20 is filled into the Optional Field of signaling message and be transmitted.
For the receiving terminal of ground monitoring terminal, it has identical decoding algorithm：It receives the position of 20 numeral compositions
Data are put, last 19 numerals are solved to the position data of 21 numeral compositions by inverse operation, inverse operation is relative to coding
For one counter push through journey；Type of message is filled, obtains the position data of 22 numeral compositions；To the position of 22 numeral compositions
The longitude and latitude for putting data carry out inversely processing, you can obtain original position-information, so-called inversely processing, be by migration processing
Longitude and latitude reduction, obtain the longitude and latitude in home position.
Next, after recipient receives the data after encoding, decoded, decoding process is corresponding with cataloged procedure, mainly
It is an anti-process pushed away, it is specific as follows：
Step (1)：In order to facilitate narration, it is assumed that after completing step S331, obtained new data are c2~c22；Complete
After step S332, obtained new data are d2~d22；After completing step S333, obtained new data are e2~e22；It is complete
Into after step S334, obtained new data are f2~f22, and therefore, data a2~a20 after coding is f3~f21；
Step (2)：Because the maximum for defining longitude and latitude before is 69 ° 59 ' 59.9 ", pass through step S33's
Coded system understands that e4 value is less than 2, because e4=d4, d4=(int) (c11/10), c11=c4*4+c11, c4=(int)
(b6/10), b6=b4*6+b6, c11=(int) (b13/10), b13=b11*6+b13, i.e. e4 can only be 0 or 1, because f4 is
For a3, f4=a3=9, e4=1 can be derived from according to parity, and due to f4=e2*2+e4, e2=4 can be obtained；
Step (3)：By the e2 value and combination a8 value released in step (2), d2*7+d9 value M is can be derived from, because
A8=d9=8, e2=d2=4, then d2*7+d9=M=48；
Step (4)：Because d2, d9 are respectively the highest order of the degree of longitude and latitude, the maximum of longitude and latitude is 0
~69 ° 59 ' 59.9 ", i.e. d2<7, d9<7, thus it can be obtained with reference to step (3)：
Thus d2=6, d9=6 be can be derived from；
Step (5)：Because e4 value is d4 value, e11 value is d11 value, e4 value in step (2)
Obtain, and e11 is a10, therefore, c4*4+c11 value N can determine that, because e4=d4=1, e11=d11=a10=5,
Then, c4*4+c11=N=15；
Step (6)：Due to c4, c11 be respectively longitude and latitude point highest order, the maximum of longitude and latitude is 0
~69 ° of 59 ' 59.9 ", c4=(int) (b4*6+b6), b4*6+b6 maximum is 35, similarly, c11=(int) (b11*6+
B13), b11*6+b13 maximum is 35, and therefore, c4, c11 are respectively less than 4, then, can obtain following expression：
Thus c4=3, c11=3 be can be derived from；
Step (7)：Because c6 is a5, the value that c13 is a12, c4 and c11 is drawn in step (6), therefore,
B4*6+b6 value K and b11*6+b13 value L can be obtained, by c6=a5=5, c13=a12=5, b4*6+b6=K=can be obtained
35, b11*6+b13=L=35；
Step (8)：Because the maximum of longitude and latitude is 0~69 ° 59 ' 59.9 ", it can thus be concluded that, b4<6, b6<6,
b11<6, b13<6, then, following expression can be obtained：
Two formulas can respectively obtain b4=5, b6=5, b11=5, b13=5 more than；
Step (9)：Because a18 is c19, b22=b19*2+b22, b19=b22, c19=b19, therefore, according to a18
Parity can obtain b22 value, due to a18=c19=7, then b22=1, and c19=b19*2+b22, it can thus be concluded that b19
=3；
Step (10)：B2=6, b4=5, b6=5, b11=5, b13=5, b19=3, b22=are obtained by above step
1, initial data b2~b22 value of remaining are equal with the value of data a2~a20 corresponding position, i.e. b3=a2=9, b5=a4
=9, b7=a6=9... by that analogy, fill position data b1~b22 before type of message b1 can be encoded, if will
Original positional information is obtained, only longitude and latitude need to be subjected to inversely processing, offset is correspondingly subtracted or plus can obtain
To original positional information.
The present invention not only realizes the compression transmission to position data, and by dexterously inclined to longitude and latitude use
Shifting is handled, and the longitude of the position data before coding and latitude is maintained between 0~69 ° 59 ' 59.9 ", is so not only made original
Position data there occurs the change in content, improve the security of data transmission, meanwhile, longitude and latitude are limited to 0
Also have the present invention more local between~69 ° 59 ' 59.9 ", by coding it can be found that the coding staff that the present invention uses
Formula is unique, enables to solve unique data when decoding, especially in whole coded system, has two steps equal
Employ " multiply 2 " mode, such as b22=b19*2+b22, b4=b2*2+b4, in this way, can be dexterously using strange
Idol judges to immediately arrive at corresponding numeral, meanwhile, whole coding, decoding step are all linked with one another, can pass through " longitude and latitude
The maximum of degree is 69 ° 59 ' 59.9 " " this condition, unique solution is drawn, so that it is guaranteed that the uniformity of coding and decoding, accurate
Property and security.
In the present embodiment, the positional information for the ship that the mobile satellite communication terminal on ship will transmit, time
The tracking informations such as information, the operational configuration of ship, speed package, encode the processing such as compression after, the information after compression is existed
Being transmitted in the Optional Field space of 10 bytes of signaling message, ground monitoring terminal is decompressed using same method decoding,
The data content so transmitted is more.
In practical application, it is not limited only to use above-mentioned data compression method in step S3, other compressions can also be used
Tracking data is compressed to length of the length equal to Optional Field in signaling message by algorithm；In step S3 can not also to
Track data are compressed, directly transmission and the length identical tracking data of Optional Field in signaling message, the tracking number
According to need to only select most important information data.
The above is only the preferred embodiment of the present invention, protection scope of the present invention is not limited merely to above-described embodiment,
All technical schemes belonged under thinking of the present invention belong to protection scope of the present invention.It should be pointed out that for the art
For those of ordinary skill, some improvements and modifications without departing from the principles of the present invention, the protection of the present invention should be regarded as
Scope.
Claims (5)
1. satellite mobile communication system subscriber's data transmission method, it is characterised in that tracking data is filled into signaling message
In Optional Field, ground monitoring terminal is transferred to by the signaling channel of satellite, specifically includes following steps：
The tracking data that preserves sends the cycle when reading last time shutdown after S1, mobile satellite communication terminal start, and by the cycle
It is set as that this tracking data sends the cycle；
S2, waited into idle condition, sending the cycle according to tracking data judges whether arrive the tracking data transmission time,
And monitor the control instruction for whether receiving the transmission of ground monitoring terminal；The time is sent if arrived, jumps to step S3；If receive
Step S5 is then jumped to control instruction；Continued waiting for if not arriving the transmission time and not receiving control instruction and keep supervising
Listen；
S3, processing is compressed to tracking data, the length of tracking data is equal to the length of Optional Field in signaling message, so
Tracking data after compression is handled again afterwards is filled into signaling message；
S4, the signaling message that tracking data is filled with step S3 is transmitted by signaling channel, jumps to step S2；
S5, parsing simultaneously perform control instruction, and step S2 is jumped to after having performed；
It is described processing is compressed to tracking data specific processing method it is as follows：
Step S31：The longitude and the form of latitude degree of being converted into every minute and second that home position will be represented, and longitude and latitude are carried out
Migration processing, the positional information after skew is compiled into 22 numeral group bags, position data b1 ~ b22 of composition, wherein b1 are represented
Type of message, b2 ~ b8 are followed successively by the degree of longitude, minute, second, and b9 ~ b15 is followed successively by the degree of latitude, minute, second, and b16 ~ b18 is speed,
B19 ~ b21 is course, and b22 is significance bit；
Step S32：Remove type of message b1 temporarily, obtain position data b2 ~ b22 of 21 numeral compositions；
Step S33：The position data of 21 numeral compositions to being obtained in step S32 encodes, and removes both ends after encoding
Numeral, retain 19 numerals of centre, so as to the position data after being encoded；
Step S34：The type of message b1 removed is supplemented in come, the 19 digital structures obtained in type of message b1 and step S33
Into the content of 10 bytes after compression, by the Optional Field of 10 bytes of these fills to signaling message, jump
Go in step S4 and be transmitted.
2. satellite mobile communication system subscriber's data transmission method according to claim 1, it is characterised in that step S5 bags
Include following steps：
S51, determine whether that change sends the instruction in cycle, be to jump to step S52, otherwise jump to step S53；
S52, the cycle for being changed to specify in control instruction by the currently transmitted cycle, jump to step S2；
S53, other instructions are performed, step S2 is jumped to after having performed.
3. satellite mobile communication system subscriber's data transmission method according to claim 2, it is characterised in that the ground
The monitor command of monitor terminal is also filled into signaling message is transferred to mobile satellite communication end by the signaling channel of satellite
End.
4. satellite mobile communication system subscriber's data transmission system, including for providing the satellite of satellite communication network, for connecing
Receive tracking data and transmission control instruction ground monitoring terminal, for mobile satellite communication terminal and ground monitoring terminal it
Between carry out data forwarding ground satellite station, for gather and send tracking data and receive and perform control instruction movement defend
Star communication terminal, it is characterised in that
The ground monitoring terminal includes：
Tracking data receiving module, for receiving tracking data；
Tracking data parsing module, for parsing tracking data；
Tracking data display module, for the tracking data after parsing to be shown into user；
Control instruction sending module, for sending control instruction to mobile satellite communication terminal；
The mobile satellite communication terminal includes：
Tracking data collector, for gathering tracking data；
Tracking data group bag module, for being packaged to the tracking data of collection；
Tracking data compression module, for the tracking data after compression group bag, the length of tracking data is set to be less than signaling message
Optional Field length；
Signaling group bag module, for the tracking data after compression to be filled into the Optional Field in signaling message；
Signal dispatcher module, for sending tracking data and receiving control instruction；
The specific processing method that the tracking data compression module packages to the tracking data of collection is as follows：
Step S31：The longitude and the form of latitude degree of being converted into every minute and second that home position will be represented, and longitude and latitude are carried out
Migration processing, the positional information after skew is compiled into 22 numeral group bags, position data b1 ~ b22 of composition, wherein b1 are represented
Type of message, b2 ~ b8 are followed successively by the degree of longitude, minute, second, and b9 ~ b15 is followed successively by the degree of latitude, minute, second, and b16 ~ b18 is speed,
B19 ~ b21 is course, and b22 is significance bit；
Step S32：Remove type of message b1 temporarily, obtain position data b2 ~ b22 of 21 numeral compositions；
Step S33：The position data of 21 numeral compositions to being obtained in step S32 encodes, and removes both ends after encoding
Numeral, retain 19 numerals of centre, so as to the position data after being encoded；
Step S34：The type of message b1 removed is supplemented in come, the 19 digital structures obtained in type of message b1 and step S33
Into the content of 10 bytes after compression, by the Optional Field of 10 bytes of these fills to signaling message, jump
Go in step S4 and be transmitted.
5. satellite mobile communication system subscriber's data transmission system according to claim 4, it is characterised in that the movement
Satellite communication terminal also includes：
Control instruction parsing module, for parsing control instruction；
Control instruction execution module, for performing the control instruction after parsing.
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| CN107592636A (en) * | 2017-08-17 | 2018-01-16 | 深圳市诚壹科技有限公司 | A kind of method of processing information, terminal and server |
| CN107592154A (en) * | 2017-09-13 | 2018-01-16 | 交通运输部北海航海保障中心天津海事测绘中心 | Ship continuous path transmission compression method based on Big Dipper short message |
| CN109768825B (en) * | 2019-02-26 | 2021-10-15 | 湖南省星岳天璇科技有限公司 | High-orbit satellite operation control user information outbound control method and device |
| CN112533160B (en) * | 2020-11-30 | 2023-10-20 | 天宸星通(深圳)科技有限公司 | Method for monitoring running state of satellite Internet of things terminal |
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