Summary of the invention
The objective of the invention is, utilize gsm communication system, under the situation that does not influence normal vehicle satellite location data transmission, in time obtain and replenish to transmit to be in the interior vehicle satellite location data of gsm communication system signal blind zone.Further, adopt data compression method, make limited storage content can replenish the long-time as far as possible and complete as far as possible track of vehicle data of transmission.
The present invention is achieved in that
A, when being in the gsm communication system signal blind zone, short message transmits can't be successful, then the blind area locating data is stored in the mobile station;
If the storage space of B mobile station is full, then when storing satellite sampling locating data group, carry out the compression of store location DS Data Set;
C, when waiting until out the gsm communication system signal blind zone, short message transmits and will realize normally, then carries out the blind area locating data and mends biography.
Among the above-mentioned steps A, can realize like this:
1, after the communication controller of mobile station is received sampling/move instruction, N sampling carried out in satellite positioning receiver output and the assigned data item is formed N organize DS Data Set and transmit as a short message by specified time interval;
2, inferior sampling the time, N is organized the locating data group temporarily to store, when next by the time satellite location data short message transmitted, if last time, short message did not transmit success yet, the N group locating data group that was then comprised in the short message last time transmitted the locating data group as a supplement and stores.
Take the data compression method given up every item among the above-mentioned steps B, concrete steps are as follows:
1, the whole storage space of supposition can store M groups locating data group;
When 2, M+1 group locating data group need be stored, former the 2nd group of locating data group removed;
When 3, M+2 group locating data group need be stored, former the 4th group of locating data group removed;
4, when M+n group locating data group need be stored, former 2n group locating data group is removed;
5, when 2n＞M 〉=N, DS Data Set to be given up will postpone every item successively increasing progressively on the DS Data Set that adds;
In case during 6 n＞M, the M group locating data group of this moment as former M group locating data group, is begun processing from the situation when M+1 group locating data group need be stored once more.
When next satellite location data short message need transmit, if last time, short message transmitted success, then be in wireless digital cell phone (GSM) system signal service area, mend the blind area locating data group that passes if necessary, promptly, also can realize like this at above-mentioned steps B:
1, in the off time that does not influence existing locating data short message transmission, N is organized the short message service center that the synthetic locating data short message of locating data group compressor units is sent to the GSM communication system;
2, monitoring and control centre is stored in N group locating data group wherein in its data bank after receiving this short message, and the blind area locating data group that obtains when need waiting to replenish from data bank is to form the successive cars positioning track.
The present invention utilizes the point-to-point SMS service of GSM communication system (SMS-PP), signaling channel by the GSM communication system transmits short message, even transmission or take over party are in talking state, can also send or receive the satellite location data of vehicle simultaneously, when take over party's monitoring and control centre suspends short message for some reason, the short message service center of GSM communication system can automatically that this take over party is all short messages leave in its in-to-in mailbox, in case this take over party recovers to receive, short message service center just will begin in a minute it is sent short message, has guaranteed that the satellite location data of vehicle is sent to monitoring and control centre as early as possible and reliably.Owing to can adopt blind area locating data storage and replenish the method that transmits, guarantee the promptness and the integraty of vehicle monitoring track under the multiple situation; Use the method for store location DS Data Set compression, can be under the situation that fully obtains the track of vehicle in the blind area, reduce the number of times that memory data output and short message send, promptly reduced load to the data storage equipment and made that also the communication load of communication link and user's communication cost are reduced in the communication system.
The specific embodiment
The present invention is further illustrated below in conjunction with specific embodiment.
Among the present invention, on vehicle, be provided with the short message communication device that comprises satellite positioning receiver, GSM communication system and the mobile station of communication controller that satellite location data is handled and the short message communication device is controlled; Be equipped with GSM communication system short message communication device at monitoring and control centre, the point-to-point SMS service that described mobile station provides by GSM communication system short message service center transmits the satellite location data and the receiving control information of vehicle to monitoring and control centre.
First embodiment of the present invention is used for monitoring and control centre the continuous running condition of controlled vehicle is monitored, and its requires to think position data (longitude, latitude) and the data such as speed, sense of motion and time that obtain vehicle in case of necessity with preset time at interval at monitoring and control centre.For example, controlled vehicle is engaged in long-distance transport, predetermined monitoring and control centre obtained its position longitude (degree, minute, second) every 2 minutes, latitude (degree, minute, second), the speed of a motor vehicle (meter per second), this 5 item number certificate of sense of motion (degree, minute, second) and time (time, minute, second) can send 10 data every 20 minutes every short messages and arrive monitoring and control centre.If be in the signal blind zone of wireless digital cell phone system when transmitting short message, this short message does not transmit success yet when causing this to give a short message, then can be with 10 data storage in this short message in mobile station.The data of mobile station stored one constant volume suppose to store at most 100 data messages.If in the time of blind area is 200 minutes, 100 data messages have then been stored; If is 300 minutes in the time of blind area, then still store 100 data messages, wherein back 50 be back 100 minutes data, preceding 50 be the interval sampling of preceding 200 minutes data, promptly presses the 0th minute, the 4th minute, the 8th minute ... ... take a sample; If in the time of blind area is 400 minutes, then still store 100 data messages, the interval sampling of 100 data of 400 minutes wherein is promptly by the 0th minute, the 4th minute, the 8th minute ... ... sampling.In storage, still attempt transmitting up-to-date short message according to former requirement, successfully then show and gone out the blind area if transmit, can be when monitoring finishes or during monitoring interval time long (as 30 minutes at interval), the data of 10 blind areas are placed in the short message are sent to monitoring and control centre, will can not have influence on the transmission of current latest data like this.Mobile station can be implemented monitoring to the transmission of short message, as when not having up-to-date short message to send, just reissues the short message of blind area; If have, then judge at the interval that two new short messages send whether enough send out a short message of reissuing, enough then send out, then continuation etc. inadequately.The data that reissue the blind area have the message classification cognizance code of oneself, monitoring and control centre receive and discern after be stored in the data bank, in needs, can be downloaded on the display terminal, finish the track of vehicle playback of one-time continuous.
Second embodiment of the present invention is used for monitoring and control centre the operation and the warning of vehicle are monitored, and it requires to obtain the position data (longitude, latitude) and the data such as speed, sense of motion and time of vehicle when monitoring and control centre is thought necessary or controlled car alarming.It is provided with the mobile station (MS) of the communication controller that comprises satellite positioning (GPS) receiver, wireless digital cell phone note (GSM/SMS) communicator and satellite location data is handled and described short message communication device is controlled on vehicle; Be equipped with wireless digital cell phone short message communication device at monitoring and control centre.
Think in case of necessity at monitoring and control centre, the point-to-point SMS service that provides by wireless digital cell phone system short message service center transmits control command to controlled vehicle, or during controlled car alarming, the communication controller of mobile station obtains sampling/move instruction, output to satellite positioning receiver is sampled, and with the position data (longitude of vehicle, latitude) and speed, data item such as sense of motion and time is formed DS Data Set and this car code, identifications such as message classification, control information, the regulation that the point-to-point SMS service that provides by wireless digital cell phone system short message service center transmits about short message is made and is become the short message that a total length is no more than 160 ASC-II sign indicating numbers, and then control short message communication device is sent to this short message by the signaling channel of wireless digital cell phone system the short message service center of wireless digital cell phone system.After the short message service center of wireless digital cell phone system is received, this short message is forwarded to the short message communication device of monitoring and control centre by the signaling channel of wireless digital cell phone system, and monitoring and control centre receives that this short message is understood and corresponding the processing.When if the short message communication device passes through the signaling channel transmission short message of wireless digital cell phone system, be in the signal blind zone of wireless digital cell phone system, then transmit short message service center less than the wireless digital cell phone system, then be stored on the mobile station, behind the signal blind zone that goes out the wireless digital cell phone system, in time the locating data of blind area mended the short message service center that passes to the wireless digital cell phone system.