CN111585773A - Method, memory and system for broadcasting text data - Google Patents
Method, memory and system for broadcasting text data Download PDFInfo
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- CN111585773A CN111585773A CN201910123575.5A CN201910123575A CN111585773A CN 111585773 A CN111585773 A CN 111585773A CN 201910123575 A CN201910123575 A CN 201910123575A CN 111585773 A CN111585773 A CN 111585773A
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- terminal
- server
- data
- differential data
- broadcasting
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/02—Details
- H04L12/16—Arrangements for providing special services to substations
- H04L12/18—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast
- H04L12/1895—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast for short real-time information, e.g. alarms, notifications, alerts, updates
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L63/00—Network architectures or network communication protocols for network security
- H04L63/08—Network architectures or network communication protocols for network security for authentication of entities
- H04L63/083—Network architectures or network communication protocols for network security for authentication of entities using passwords
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L63/00—Network architectures or network communication protocols for network security
- H04L63/10—Network architectures or network communication protocols for network security for controlling access to devices or network resources
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/50—Network services
- H04L67/52—Network services specially adapted for the location of the user terminal
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/32—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials
- H04L9/321—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials involving a third party or a trusted authority
- H04L9/3213—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials involving a third party or a trusted authority using tickets or tokens, e.g. Kerberos
Abstract
The invention relates to the technical field of satellite navigation positioning service, and discloses a method for broadcasting text data, which comprises the following steps: step 1, a terminal sends a request parameter to a server; step 2, the server side judges the type of service required by the terminal; step 3, the server side responds to the user request to send data; and 4, closing the connection by the server and finishing the request. Correspondingly, a memory and a system for realizing the broadcast of the telegraph text data are also disclosed. Some technical effects of the invention are as follows: the method and the system realize the on-demand broadcasting of the telegram data, reduce the flow waste and reduce the operation pressure of the server.
Description
Technical Field
The invention relates to the technical field of satellite navigation positioning service, in particular to the field of broadcasting of differential data, ephemeris data and the like, and particularly relates to a method, a memory and a system for broadcasting telegraph text data.
Background
The satellite navigation technology is the most common navigation positioning technology at present, and has been widely applied to various military and civil fields of land, sea, sky and space, and the four existing global satellite navigation systems are Beidou, GPS, GL0NASS and GALILEO. The method only uses a navigation satellite to carry out real-time single-point positioning, the positioning precision is about 10 meters, if the navigation satellite is observed in real time through a plurality of ground reference stations, information such as clock error, orbit, ionospheric delay and the like of the satellite is corrected based on an observation value, the corrected information is packaged into a differential data product, the differential data product is broadcasted to a user through various ways, the user can improve the real-time positioning precision to a meter level, a decimeter level or even a centimeter level by combining the differential data product and an original observation value of the navigation satellite, and more high-precision position service applications can be promoted while the positioning precision of the user is greatly improved. In other occasions, in the use scenes of satellite and base station, base station and user terminal, satellite and user terminal, etc., differential data, ephemeris data, etc. are also used according to personalized work needs.
Virtual Reference Stations (VRS-Virtual Reference states). Firstly, a certain number of base stations are erected in a certain area, a base station receives satellite signals and then transmits the information to an information processing center, a mobile station firstly transmits the position information of a receiver to the data processing center, the data processing center can select the information of a plurality of base stations with good positions nearby according to the position of the mobile station, one reference station is virtually arranged, and then the virtually arranged reference station correction data are broadcasted to the mobile station.
The basic principle of network RTK is: the reference station (also called base station or reference station) with known precise coordinates calculates the distance correction number from itself to the satellite and uploads the distance correction number to the data center in a unified manner, and the ground augmentation system (differential broadcast platform) is formed by the reference station and the data center. The differential broadcast platform sends the data to the terminal equipment (such as survey and drawing equipment, mobile phone, automobile, unmanned aerial vehicle, bicycle, etc.) needing positioning in real time. The terminal equipment receives the differential data sent by the differential broadcasting platform while carrying out satellite observation, and corrects the positioning result, thereby improving the positioning precision.
The existing network RTK technology, also known as multi-reference station RTK, is generally suitable for measuring a surveying and mapping terminal, and comprises the following specific processes:
1. the (measurement type) terminal accesses a service terminal (cloud end) (a server platform (running in a cloud environment) for providing high-precision positioning service) through an NTRIP (network Transport of RTCM via Internet protocol) and establishes connection;
2. the terminal calculates the probability position of the terminal through single-point positioning or other modes;
3. the terminal uploads the probability position of the terminal by a GGA format defined by NMEA (National Marine Electronics Association, short for American National ocean Electronics Association, which is now the RTCM standard protocol unified by GPS navigation equipment);
4. the server side broadcasts the differential correction data of the corresponding VRS grids to the terminal according to the probability position of the terminal;
5. the terminal continuously uploads the GGA, and the server continuously broadcasts the difference data;
6. and (4) until the measuring personnel think that the measuring task is finished, positioning is not needed any more, and the connection with the service end is actively disconnected through the terminal.
In order to solve different service requirements, the RTCM data dissemination currently adopts the Ntrip protocol. Ntrip is an application layer RTCM network transmission protocol, but is actually encapsulated on a TCP/IP protocol, and socket communication is used. The Ntrip protocol provides RTCM data service to users by adopting different mounting points, and the disadvantages of the method are:
1. after a user selects a certain mounting point, the service end can only send certain service RTCM data to the user according to a certain frequency, the RTCM data can be sent no matter the user needs to send the RTCM data, and for the user, different data such as ephemeris data, single-frequency/double-frequency differential data and related error correction data can be needed;
2. in terms of data traffic, some data do not need to be sent in real time, such as ephemeris data, but once rtcm service of a certain mounting point is selected, the data can be sent continuously, bandwidth waste is caused, and traffic of a user is increased; since each user needs to send data in real time, the traffic of the server side is increased, and data shared by the users is repeatedly sent.
For example, patent publication No. CN108490464A proposes a network RTK broadcasting method suitable for a consumer terminal, in which a terminal initiates a connection request and establishes a connection at a server, then the terminal reports an approximate position, the server selects a VRS grid according to a probability position and broadcasts differential data, the server automatically stops broadcasting when receiving data that is "stop broadcasting immediately" or is broadcast for a period of time, and the server maintains a long connection with the terminal when stopping broadcasting the differential data.
This method has not only the above-mentioned disadvantages but also other drawbacks as follows:
1. when the data broadcasting is stopped, the long connection with the terminal is still maintained, which causes the waste of connection resources of the server, and if the number of the maintained long connections is too large, the maintenance difficulty of the server is increased.
2. The terminal needs to send a broadcast stop message to the server, and the server will stop data broadcast, otherwise the server will send data circularly, which causes unnecessary traffic waste.
In summary, the prior art has the following problems: the broadcasting on demand, the flow waste, the large operating pressure of the server and the like cannot be realized according to the individual requirements of the terminal.
Disclosure of Invention
In order to solve the foregoing technical problems, the present invention provides a method, a memory and a system for broadcasting text data.
The invention provides a method for broadcasting text data, which comprises the following steps:
step 1, a terminal sends a request parameter to a server;
step 2, the server side judges the type of service required by the terminal;
step 3, the server side responds to the user request to send data;
and 4, closing the connection by the server and finishing the request.
Preferably, the request parameters sent by the terminal include: password, access token, ServiceType, GGA.
Preferably, the server performs terminal authentication by a password.
Specifically, the server generates an access token after passing the verification and returns the access token to the terminal, and the server sets the validity period of the access token and records the terminal information.
Specifically, the access token validity period is 30 min.
Preferably, the service end can judge the service type required by the terminal through a parameter ServiceType sent by the terminal, wherein the parameter ServiceType includes single-frequency RTK differential data, dual-frequency RTD differential data, and ephemeris data.
Preferably, the server side can judge whether differential data needs to be sent to the terminal by receiving the GGA parameter sent by the terminal; and when the server receives the GGA parameters, judging that differential data needs to be sent to the terminal, and acquiring the probability position of the terminal.
Preferably, the server sets the probability position initially uploaded by the terminal as an initial probability position, and acquires a corresponding reference station and records information.
Preferably, the server determines whether the absolute value of the distance difference between the initial probability position of the terminal and the probability position of the current transmission is greater than a threshold; if not, acquiring differential data by adopting the corresponding reference station recorded by the server side, and sending the terminal; and if so, re-acquiring the corresponding reference station, updating the corresponding record of the server side, and acquiring the differential data transmitting terminal.
Specifically, the server sets the threshold to 5 km.
Correspondingly, the invention also discloses a memory and a text data broadcasting system.
A memory stores a computer program for executing the method for broadcasting the text data.
A system for broadcasting text data executes the method for broadcasting text data.
Some technical effects of the invention are as follows: the on-demand broadcast of the telegram data is realized, the data flow waste is reduced, and the operating pressure of the server is reduced.
Drawings
For a better understanding of the technical solution of the present invention, reference is made to the following drawings, which are included to assist in describing the prior art or embodiments. These drawings will selectively demonstrate articles of manufacture or methods related to either the prior art or some embodiments of the invention. The basic information for these figures is as follows:
figure 1 method steps for broadcasting text data
FIG. 2 is a flow chart of the server-side work
FIG. 3 is a flow chart of the server
Detailed Description
The technical means or technical effects related to the present invention will be further described below, and it is obvious that the examples provided are only some embodiments of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step, will be within the scope of the present invention based on the embodiments of the present invention and the explicit or implicit representations or hints.
In one embodiment of the present invention, a method for broadcasting text data is provided, which includes the steps of:
step 1, a terminal sends a request parameter to a server;
specifically, the terminal initiates a request, establishes a connection with the server, and then sends a request parameter. The invention can be expanded based on NTRIP protocol, or adopts brand new bidirectional interactive protocol, and does not limit specific interactive protocol.
Specifically, the request parameters sent by the terminal to the server include a password, an access token, a ServiceType, and a GGA. The request parameter types are respectively in one-to-one correspondence with the transmission data types. The password may include a terminal ID and a password, a terminal ID and a short message authentication, a terminal ID and some biometric feature (e.g., a face, a fingerprint, a voiceprint, etc.). The access token is a pass permission which is fed back to the terminal by the server side after the password passes the verification. The ServiceType is a service type required by the terminal. GGA is Global positioning System Fix Data, i.e., satellite positioning information.
And particularly, the server generates an access token after passing the verification and returns the access token to the terminal, and the server is provided with an access token validity period and records the terminal information. And when the valid period expires, clearing the corresponding terminal information.
Preferably, the access token validity period is set to 30 min.
Step 2, the server side judges the type of service required by the terminal;
specifically, the service end can judge the service type required by the terminal through a parameter ServiceType sent by the terminal, wherein the parameter ServiceType comprises single-frequency RTK differential data, single-frequency RTD differential data, double-frequency RTK differential data, double-frequency RTD differential data and ephemeris data.
Specifically, the server side can judge whether differential data needs to be sent to the terminal by combining the GGA parameters sent by the receiving terminal; and when the server receives the GGA parameters, judging that differential data needs to be sent to the terminal, and acquiring the probability position of the terminal.
Generally, when the ServiceType sent by the terminal is single-frequency RTK differential data, single-frequency RTD differential data, dual-frequency RTK differential data, and dual-frequency RTD differential data, the GGA parameter is uploaded at the same time, so that the service end obtains the differential data and broadcasts the differential data according to the requirements of the terminal. By applying the invention, the terminal can send the GGA parameters after a certain time, and the terminal is not required to send the GGA parameters within the validity period of the access token, and the server side still sends the differential data according to the request parameters of the terminal according to the record at the moment.
Specifically, the server sets the probability position initially uploaded by the terminal as an initial probability position, acquires a corresponding reference station, and records information. The reference station may be a base station or a virtual reference station. The recorded information includes a terminal ID, a reference station number. At present, all the VRSs of the grid VRS are generated in advance, and the position of each VRS is stored in a server. The longitude and latitude of the user can be obtained from the GGA information, and then the VRS corresponding to the current position of the user can be obtained by adopting the existing geohash algorithm.
Specifically, the server side judges whether the absolute value of the distance difference between the initial probability position of the terminal and the probability position sent at the current time is larger than a threshold value; if not, acquiring differential data by adopting the corresponding reference station recorded by the server side, and sending the terminal; and if so, re-acquiring the corresponding reference station, updating the corresponding record of the server side, and acquiring the differential data transmitting terminal.
In particular, the threshold is set to 5 km.
Step 3, the server side responds to the user request to send data;
specifically, the server responds to the message data required by the sending terminal according to the service type required by the terminal. If the terminal only needs differential data, the server only needs to send the data after executing the steps; if the terminal only needs ephemeris data, the server only sends differential data after acquiring the satellite ephemeris data. The telegraph text data broadcasting method can realize broadcasting according to needs, reduce flow waste and reduce the operation pressure of a server.
And 4, closing the connection by the server and finishing the request.
Specifically, after the server transmits the text data required by the terminal, the termination of the interaction with the terminal is judged, and at this time, the server actively associates the connection with the terminal to terminate the request. The positioning navigation industry is led to the consumer market, when the positioning navigation system is oriented to the general public, the telex broadcasting system bears great parallel pressure during operation, and the server side of the invention actively disconnects after responding to the terminal, so that the parallel pressure can be greatly reduced.
Correspondingly, the invention also discloses a memory and a text data broadcasting system.
Correspondingly, the invention also discloses a memory and a generation system of the map symbol marked line.
A memory stores a computer program for executing the method for broadcasting the text data.
A system for broadcasting text data executes the method for broadcasting text data.
It should be noted that the foregoing description of "being used" should be interpreted as "being used primarily and not as" being used only ".
The various embodiments or features mentioned herein may be combined with each other as additional alternative embodiments without conflict, within the knowledge and ability level of those skilled in the art, and a limited number of alternative embodiments formed by a limited number of combinations of features not listed above are still within the scope of the present disclosure, as understood or inferred by those skilled in the art from the figures and above.
Finally, it is emphasized that the above-mentioned embodiments, which are typical and preferred embodiments of the present invention, are only used for explaining and explaining the technical solutions of the present invention in detail for the convenience of the reader, and are not used to limit the protection scope or application of the present invention.
Therefore, any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be covered within the protection scope of the present invention.
Claims (12)
1. A method for broadcasting text data is characterized in that:
step 1, a terminal sends a request parameter to a server;
step 2, the server side judges the type of service required by the terminal;
step 3, the server side responds to the user request to send data;
and 4, closing the connection by the server and finishing the request.
2. The method as claimed in claim 1, wherein the request parameters sent by the terminal include: password, access token, GGA, ServiceType.
3. The method as claimed in claim 1, wherein the server performs terminal authentication by means of a password.
4. The method as claimed in claim 3, wherein the server generates the access token after passing the verification and returns the access token to the terminal, and sets the validity period of the access token and records the terminal information.
5. A method as claimed in claim 3, wherein the validity period of the access token is 30 min.
6. The method as claimed in claim 1, wherein the server can determine the type of service required by the terminal through a parameter ServiceType sent by the terminal, and the parameter ServiceType includes single-frequency RTK differential data, dual-frequency RTD differential data, and ephemeris data.
7. The method as claimed in claim 6, wherein the server determines whether it is necessary to send differential data to the terminal by combining the GGA parameters sent by the receiving terminal; and when the server receives the GGA parameters, judging that differential data needs to be sent to the terminal, and acquiring the probability position of the terminal.
8. The method as claimed in claim 7, wherein the server sets the probability location of the initial upload of the terminal as an initial probability location, and obtains a corresponding reference station to record information.
9. The method for broadcasting text data according to claim 8,
the server side judges whether the absolute value of the distance difference between the initial probability position of the terminal and the probability position sent at the current time is larger than a threshold value;
if not, acquiring differential data by adopting the corresponding reference station recorded by the server side, and sending the terminal;
and if so, re-acquiring the corresponding reference station, updating the corresponding record of the server side, and acquiring the differential data transmitting terminal.
10. A method as claimed in claim 9, wherein said threshold is 5 km.
11. A memory storing a computer program, wherein the memory executes the method for distributing textual data according to any of claims 1 to 10.
12. A system for broadcasting text data, wherein the system performs the method for broadcasting text data according to any one of claims 1 to 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910123575.5A CN111585773A (en) | 2019-02-18 | 2019-02-18 | Method, memory and system for broadcasting text data |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910123575.5A CN111585773A (en) | 2019-02-18 | 2019-02-18 | Method, memory and system for broadcasting text data |
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| Publication Number | Publication Date |
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| CN111585773A true CN111585773A (en) | 2020-08-25 |
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| CN201910123575.5A Withdrawn CN111585773A (en) | 2019-02-18 | 2019-02-18 | Method, memory and system for broadcasting text data |
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| CN108490464A (en) * | 2018-03-21 | 2018-09-04 | 千寻位置网络有限公司 | A kind of network RTK broadcasting methods being suitable for consuming Terminal Type |
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2019
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Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999057576A1 (en) * | 1998-05-04 | 1999-11-11 | Snaptrack, Inc. | Method and apparatus for operating a satellite positioning system receiver |
| EP2763048A2 (en) * | 2011-09-29 | 2014-08-06 | Chung Jong Lee | Security-enhanced cloud system and security management method thereby |
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Application publication date: 20200825 |