CN103389501A - Method for processing auxiliary positioning information, information processing module and terminal - Google Patents
Method for processing auxiliary positioning information, information processing module and terminal Download PDFInfo
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Abstract
The invention provides a method for processing auxiliary positioning information. The method comprises the steps as follows: piercing point coordinates corresponding to a satellite are calculated according to parameters such as evaluation angles, azimuth angles and the like which are formed by a user terminal and the visible satellite; numbers of grid points falling into a circle which adopts the piercing point coordinates as a circle center and a first preset distance as a radius are obtained; and deferred messages corresponding to the obtained grid point numbers are sent to the user terminal. The method can greatly reduce data size transmission of the auxiliary positioning information of the user terminal, so that the user terminal can obtain credible auxiliary positioning information with minimum data size, and the service quality of mobile communication is improved. Meanwhile, the invention further provides an information processing module and a terminal.
Description
Technical Field
The present invention relates to the field of satellite navigation, and in particular, to a method for processing positioning assistance information, an information processing module, and a terminal.
Background
With the continuous development of navigation technology and communication technology, people have higher and higher requirements on location services, and in order to improve the quality of location services and realize quick and accurate positioning, the navigation technology is combined with mobile communication, and positioning auxiliary information is sent to a user terminal through a base station by using the existing mobile network so as to improve the positioning efficiency and accuracy, namely A-BDS in China. The correction to the ionosphere is also included, and the grid ionosphere is used to correct the positioning accuracy.
The grid ionosphere correction model is a grid which is drawn by taking 5 degrees as intervals in the longitude direction and the latitude direction of a certain region, each grid point has a corresponding vertical delay and a vertical delay error index, and the two parameters can obtain corresponding values through corresponding table query. And (3) correcting the ionosphere, namely calculating the ionosphere delay of the puncture point by adopting a bilinear interpolation method according to the vertical delay and the vertical delay error index of the nearest 4 grid points around the puncture point. However, if all the information is sent to the user terminal, the user cannot use all the information, which results in waste of traffic resources and affects the service quality of mobile communication.
Disclosure of Invention
Based on the situation, the invention provides a method for processing positioning auxiliary information, which mainly utilizes the vertical delay and the vertical delay error index of 3 or more grid points in a circular area around a puncture point to calculate the ionospheric delay of the puncture point, and requires a base station not to transmit unnecessary information as much as possible, thereby greatly saving the flow and improving the service quality of mobile communication.
A processing method of positioning auxiliary information comprises the following steps:
calculating the puncture point coordinate corresponding to the satellite according to the parameters of the elevation angle, the azimuth angle and the like formed by the user terminal and the visible satellite; acquiring the serial numbers of all grid points falling into the circle by taking the coordinate of the puncture point as a circle center and taking a first preset distance as a radius; and sending the delay information corresponding to the acquired grid point number to the user terminal.
And the user terminal acquires delay information corresponding to the serial numbers of all grid points falling into the circle by taking the acquired piercing point coordinate as the center of the circle and taking the first preset distance as the radius, and calculates the ionospheric delay at the piercing point.
When it is effective to acquire delay information corresponding to all grid point numbers falling into the circle by taking the piercing point coordinate as a circle center and taking the first preset distance as a radius, the ionospheric delay at the piercing point: (ii) a
Wherein the vertical ionospheric delay of the grid-point broadcast is used
The distance weights of the puncture point and the N grid points are respectively used
And (4) showing.
And at least three grid point numbers falling into the circle are provided.
And if the number of all grid points falling into the circle is less than three, changing the first preset distance into a second preset distance, wherein the second distance is greater than the first distance.
The invention also discloses a Beidou satellite navigation system signal processing chip applying the method.
The invention also discloses a Beidou satellite navigation system signal processing module applying the processing chip.
The invention also discloses a terminal applying the Beidou satellite navigation system signal processing module.
Compared with the prior art, the positioning auxiliary information processing method provided by the invention has the advantages that the puncture point coordinate corresponding to the satellite is calculated according to the parameters such as the elevation angle and the azimuth angle formed by the user terminal and the visible satellite; acquiring the serial numbers of all grid points falling into the circle by taking the coordinate of the puncture point as a circle center and taking a first preset distance as a radius; and sending the delay information corresponding to the grid point number in the acquired circular area to the user terminal, so that the data volume transmission of the positioning auxiliary information of the user terminal can be greatly reduced, and the user terminal can acquire reliable positioning auxiliary information with the least data volume, thereby improving the service quality of mobile communication.
Drawings
Fig. 1 is a flowchart illustrating an embodiment of a method for processing positioning assistance information according to the present invention;
FIG. 2 is a schematic diagram of ionosphere puncture point geometry in an embodiment of a method for processing location assistance information according to the present invention;
fig. 3 is a schematic diagram of user puncture points and grid points in an embodiment of a method for processing positioning assistance information according to the present invention;
fig. 4 is a schematic diagram of a method for screening grid points in an embodiment of a method for processing positioning assistance information according to the present invention.
Detailed Description
The invention will now be described in detail with reference to the preferred embodiments thereof.
Fig. 1 is a schematic flow chart illustrating an embodiment of a method for processing positioning assistance information according to an information processing method of the present invention.
As shown in fig. 1, the method in this embodiment includes the steps of:
s101: calculating the coordinates (longitude and latitude) of a puncture point corresponding to the satellite according to the parameters such as an elevation angle and an azimuth angle formed by the user and the visible satellite;
the satellite visible to the user terminal is determined through other auxiliary information such as ephemeris transmitted through the network, and there is an intersection point, called a puncture point, in the ionosphere between the connection line of the terminal and the visible satellite, as shown in fig. 2.
The puncture point calculation formula is as follows:
geographic latitude and longitude coordinates of puncture point (
) Geographic latitude and longitude coordinates of user: (
) In units of radian, middleFor heart angleExpressed as the angle between the user, the geocentric and the puncture point, the azimuth angle
Expressed as north-clockwise at the user point to the angle, elevation, of the line connecting the user and the puncture point
By representation, the radius of the earth is by the angle between the tangent to the earth's surface at the user point and the puncture point
Indicating the vertical height of the earth at the maximum electron density of the ionosphereAnd (4) showing. Wherein,
When in useAnd isOr
If not, then,
S102: acquiring the serial numbers of all grid points falling into the circle by taking the coordinate of the puncture point as the center of the circle and taking a preset distance as a radius;
the coverage range of the ionosphere grid of the Beidou satellite is 70-145 degrees of east longitude and 7.5-55 degrees of north latitude. By carrying out grid division on the coverage area of the network, the divided grids are also provided with proper numbers, and the acquired data management is more convenient to manage and calculate. The specific division method comprises the following steps: the east longitude is 70-145 degrees, the north latitude 10-55 degrees area is divided according to longitude and latitude 5 multiplied by 5 degrees to form 160 grid points, and the grid point number (IGP) is 1-160. The east longitude is 70-145 degrees, the north latitude 7.5-52.5 degree area is divided according to longitude and latitude 5 multiplied by 5 degrees to form 160 grid points, and the grid point number (IGP) is 161-320. The minimum precision of the division is 2.5 multiplied by 5 degrees, and the total number of the grid points is 320. The specific division is shown in tables 1-1 and 1-2.
TABLE 1-1 IGP numbering Table
TABLE 1-2 IGP numbering tables
When the IGP number is less than or equal to 160, the corresponding longitude and latitude are as follows:
longitude (G)
Latitude
When the IGP number is more than 160, the corresponding longitude and latitude are as follows:
longitude (G)
Latitude
Where INT (×) denotes rounding down.
Each grid point ionosphere information includes grid point vertical delay (
) And the error index (GIVEI), occupying 13 bits in total. The information is arranged and defined as follows:
table 2 ionospheric information definition table
The ionospheric vertical delay of the ith grid point, expressed in distance, is 0.125 with a scale factor of meters and ranges from 0 to 63.625 meters, and when the state is "111111110" (= 63.750 meters), it indicates that IGP is not monitored; when the status is "111111111" (= 63.875 meters), it indicates "unavailable". "
Grid point ionospheric vertical delay correction error (GIVE) is used to describe the accuracy of grid point ionospheric delay correction and is characterized by grid point ionospheric vertical delay correction error index (GIVEI). The relationship between GIVEI and GIVE is shown in Table 3.
TABLE 3 GIVEI Definitions Table
According to the ionospheric vertical delay and the delay error index of the grid points, a user can select effective grid point data adjacent or close to the surrounding of the puncture points, a model is designed by himself, ionospheric correction numbers at the puncture points of the satellite are interpolated and observed, when at least 3 grid point identifications of the surrounding grid where the puncture points of the user are located are effective, the ionospheric delay at the puncture points can be calculated by a bilinear interpolation method according to the vertical ionospheric delay broadcasted on the effective grid points, and the example is 4 effective grid points. The guiding fitting algorithm is as follows, and the concrete model is shown in fig. 3.
FIG. 3 is a schematic diagram of a user's puncture point and a grid point where the IPP is the geographical location of the ionosphere puncture point corresponding to the connection of the user's receiver to a satellite, with geographical latitude and longitude (b
) And (4) showing. The positions of the 4 surrounding grid points are respectively (
) Indicating vertical ionospheric delay in grid-point broadcast
Indicating that the distance weights of the puncture point and the four grid points are respectively used
And (4) showing.
Definition of，
Then the weights are respectively:
if one grid mark of the observation epoch is invalid, the corresponding weight is 0.
When three or more grid points IGP are obtained, the distribution of the grid points IGP at the positions of the puncture points can enable the grid points to obtain results with different ionospheric delay calculation accuracies, the closer to the puncture points, the more uniform the distribution, the more effective points, the higher the calculation accuracy, and the better the auxiliary positioning effect; on the contrary, the distribution is concentrated, and the calculation accuracy is relatively reduced. As shown in fig. 4, the puncture points a are located in the grid formed by grid points 12, 173, 22, 183. At this time, by drawing a circle with the puncturing point a as the center and the first preset distance as the radius R, the corresponding points of all the grid points IGP172, 12, 173, 22, 183 in the circle can be acquired, and the accuracy of the acquired grid points is relatively high as long as three grid points are valid. However, compared to the non-circular area, the grid point is random when being acquired, that is, when two points are acquired in the same direction, the third point searched for may still be in the same direction, so that the calculation accuracy is reduced with a certain probability. However, in this case, if less than three points corresponding to all the acquired grid points IGP172, 12, 173, 22, 183 are valid, the system re-acquires all the grid point numbers in the second circle using the second predetermined distance as the radius. And repeating the steps until at least three effective grid point information are obtained.
S103: and sending the delay information corresponding to the acquired grid point number to the user terminal.
Each grid point has corresponding vertical delay and vertical delay error index, the vertical delay occupies 9 x 320=2880 bits, the vertical delay error index occupies 4 x 320=1280 bits, if all the information is sent to the user terminal, and the user can not utilize all the information, the waste of flow resource is caused, the service quality of mobile communication is also influenced, therefore, effective and limited grid point information is sent to the user terminal according to the request of the user terminal, and network resource and positioning auxiliary information are reasonably utilized.
Furthermore, the invention applies the Beidou satellite navigation system signal processing chip of the method.
Furthermore, the invention applies the Beidou satellite navigation system signal processing module of the Beidou satellite navigation system signal processing chip.
Furthermore, the invention also discloses a terminal of the Beidou satellite navigation system signal processing module.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (8)
1. A method for processing positioning assistance information is characterized by comprising the following steps: calculating the puncture point coordinate corresponding to the satellite according to the parameters of the elevation angle, the azimuth angle and the like formed by the user terminal and the visible satellite; acquiring the serial numbers of all grid points falling into the circle by taking the coordinate of the puncture point as a circle center and taking a first preset distance as a radius; and sending the delay information corresponding to the acquired grid point number to the user terminal.
2. The information processing method according to claim 1, wherein the user terminal obtains delay information corresponding to all grid point numbers falling in the circle by taking the obtained piercing point coordinates as a center of the circle and taking a first preset distance as a radius, and calculates ionospheric delay at the piercing point.
3. The information processing method according to claim 2, wherein when it is valid to acquire the delay information corresponding to all mesh point numbers falling within the circle with the first preset distance as a radius around the puncture point coordinate, the ionospheric delay at the puncture point is:
；
wherein the vertical ionospheric delay of the grid-point broadcast is used
The distance weights of the puncture point and the N grid points are respectively usedAnd (4) showing.
4. An information processing method according to claims 1-2, wherein all the mesh points falling within the circle are numbered at least three.
5. An information processing method according to claims 1-3, characterized in that if all the grid point numbers falling into the circle are less than three, the first preset distance is changed to a second preset distance, and the second distance is greater than the first distance.
6. A Beidou satellite navigation system signal processing chip applying the method of claims 1-5.
7. A Beidou satellite navigation system signal processing module comprising the processing chip of claim 6.
8. A terminal using the Beidou satellite navigation system signal processing module of claim 7.
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| WO2014198181A1 (en) * | 2013-06-13 | 2014-12-18 | 中兴通讯股份有限公司 | A network-aided method, terminal and network side device for satellite navigation and positioning |
Citations (1)
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|---|---|---|---|---|
| CN103076615A (en) * | 2011-12-27 | 2013-05-01 | 东莞市泰斗微电子科技有限公司 | Ionized layer delaying estimation method of Beidou navigation satellite system and corresponding receiving device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103076615A (en) * | 2011-12-27 | 2013-05-01 | 东莞市泰斗微电子科技有限公司 | Ionized layer delaying estimation method of Beidou navigation satellite system and corresponding receiving device |
Non-Patent Citations (1)
| Title |
|---|
| 杨力: "《大气对GPS测量影响的理论与研究》", 《中国优秀博硕士学位论文全文数据库（博士） 基础科学辑》, no. 1, 30 June 2002 (2002-06-30) * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014198181A1 (en) * | 2013-06-13 | 2014-12-18 | 中兴通讯股份有限公司 | A network-aided method, terminal and network side device for satellite navigation and positioning |
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