CN111651407A - Original observation data recording method, electronic device, storage medium and system - Google Patents
Original observation data recording method, electronic device, storage medium and system Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000007405 data analysis Methods 0.000 claims description 12
- 238000004590 computer program Methods 0.000 claims description 4
- 230000006870 function Effects 0.000 claims description 4
- 238000005192 partition Methods 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 3
- 238000004891 communication Methods 0.000 abstract description 6
- 208000028257 Joubert syndrome with oculorenal defect Diseases 0.000 abstract 1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
- G06F16/10—File systems; File servers
- G06F16/13—File access structures, e.g. distributed indices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/03—Cooperating elements; Interaction or communication between different cooperating elements or between cooperating elements and receivers
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
- G06F16/10—File systems; File servers
- G06F16/16—File or folder operations, e.g. details of user interfaces specifically adapted to file systems
Abstract
The invention provides a method for recording original observation data, which comprises the following steps: analyzing GNSS original observation data in real time and returning the current GNSS epoch time and the length and content of the original observation data; writing the returned original observation data block into a file in real time and returning the offset value of the file at the moment; establishing an index table according to the returned GNSS epoch time and the offset value of the file, and writing the index table into the file when one file is closed after being recorded; when a data return request of the data center is received, time information is determined according to the file name, the file is repositioned, the data index table is read, the data block offset and the data block size are located according to the time information, and the corresponding data blocks are all read out and sent to the data center. The method can quickly acquire the offset address of the data block in the required time period, not only does not increase the burden of a reference station processor, but also can reduce the load of network communication, and greatly improves the reliability and robustness of the CORS system.
Description
Technical Field
The invention relates to the technical field of global satellite navigation surveying and mapping, in particular to a method, electronic equipment, a storage medium and a system for recording original observation data.
Background
With the rapid progress and widespread application of GNSS technology, the role of continuous operation reference station technology (CORS) in urban surveying has become increasingly important. CORS is a network system composed of a plurality of fixed GNSS reference stations which are continuously operated for a long time and are established in a city, a region or a country according to a certain distance by utilizing the technologies of a global navigation satellite system, a computer, data communication, internet and the like, and is an infrastructure of spatial information.
In the actual operation process of the CORS, each reference station needs to upload original observation data to a data center in real time, and the reference stations are required to record the original observation data in real time locally in order to ensure the reliability of the system. When a communication link of a certain reference station has a problem, original observation data cannot be uploaded to a data center in real time, the original observation data recorded locally by the reference station is a main data backup, when a communication network recovers to be normal, the data center sends a request to the reference station to request the reference station to upload the original observation data in a communication interruption time period, and because a receiver of the reference station is usually a processor with lower performance, the traditional original observation data recording method records binary original observation data in a text file in real time instead of using a high-level database for data storage. Therefore, when the data center sends a data retransmission request, the file recorded by the traditional recording method cannot efficiently extract the data in a specific certain time period, and the problem that the processing load of the receiver is reduced only by returning all the files can be solved. In the actual operation of the mode, more inconvenience is brought to the later data processing of the data center, and particularly, the more reference stations, the more redundancy burden is increased.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a method for recording original observation data, which can solve the problem that when the communication link route of a certain reference station in a CORS system is recovered to be normal due to abnormality, the reference station can respond to a more precise request of a data center and return the original observation data of the minimum unit to the minute level.
The invention provides a method for recording original observation data, which comprises the following steps:
analyzing GNSS original observation data in real time, and returning the current GNSS epoch time and the length and content of the original observation data in real time;
automatically generating file parameter information and writing the file when a file is newly built each time, writing the returned original observation data block into the file in real time, and returning the offset value of the file at the moment in real time;
establishing an index table according to the returned GNSS epoch time and the offset value of the file, storing the index table in a memory and updating the index table in real time, and writing the index table into the file when one file is closed after being recorded;
when a data return request of a data center is received, time information is determined according to a file name, a positioned file is opened by positioning the file through the time information, a data index table is read, data block offset and data block size are positioned according to the time information, and corresponding data blocks are all read out and sent to the data center through the data block offset and the data block size.
Further, the GNSS epoch time is accurate to one second.
Further, the original observation data adopts a partition structure which sequentially comprises file parameter information, the original observation data and a data index table from front to back to record the data.
Further, the time for returning the current GNSS epoch in real time is specifically the time for returning the GNSS epoch per second; the offset value for returning the file at this time in real time is specifically an offset value for returning the file per second.
Further, the creating of the index table according to the returned GNSS epoch time and the offset value of the file specifically generates an index field in units of one minute.
Further, the determining time information according to the file name specifically includes determining an hour according to the file name, and positioning a file according to the hour; and the step of reading all the corresponding data blocks through the data block offset and the data block size and sending the read data blocks to the data center specifically is to call a file read-write function to read all the corresponding data blocks and send the read data blocks to the data center.
Further, the read data index table is specifically a data index table at the end of the read file.
An electronic device, comprising: a processor;
a memory; and a program, wherein the program is stored in the memory and configured to be executed by the processor, the program comprising instructions for performing a raw observation data recording method.
A computer-readable storage medium having stored thereon a computer program for executing a raw observation data recording method by a processor.
The original observation data recording system comprises a central decision unit, a data recording unit, a data analysis unit, a data index unit and a data return unit; wherein the content of the first and second substances,
the data analysis unit is used for analyzing the GNSS original observation data in real time and returning the current GNSS epoch time and the length and content of the original observation data in real time;
the central decision unit is used for transmitting the result returned by the data analysis unit to the data analysis unit and the data index unit in real time; when a file is recorded and closed, writing the index table into the file through the data recording unit;
the data recording unit is used for automatically generating file parameter information and writing the file when a file is newly built every time, writing the original observation data block returned by the central decision unit into the file in real time, and simultaneously returning the offset value of the file to the central decision unit in real time;
the data index unit is used for establishing an index table according to the GNSS epoch time and the file offset value returned by the central decision unit, storing the index table in a memory and updating the index table in real time;
the data returning unit is used for determining time information according to a file name when a data returning request of the data center is received, positioning a file according to the time information, opening a data index table at the tail of the file reading file, positioning data block offset and data block size according to the time information, and completely reading out corresponding data blocks through the data block offset and the data block size and sending the data blocks to the data center.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a method for recording original observation data, which comprises the following steps: analyzing GNSS original observation data in real time, and returning the current GNSS epoch time and the length and content of the original observation data in real time; automatically generating file parameter information and writing the file when a file is newly built each time, writing the returned original observation data block into the file in real time, and returning the offset value of the file at the moment in real time; establishing an index table according to the returned GNSS epoch time and the offset value of the file, storing the index table in a memory and updating the index table in real time, and writing the index table into the file when one file is closed after being recorded; when a data return request of a data center is received, time information is determined according to a file name, a file is located through the time information, the located file is opened, a data index table is read, data block offset and data block size are located according to the time information, and corresponding data blocks are all read out through the data block offset and the data block size and sent to the data center. The present invention relates to an electronic device and a storage medium for executing a raw observation data recording method. The invention also relates to a system for recording the original observation data. The invention improves the recording method of the original observation data in the local reference station receiver, establishes an index table according to the GNSS epoch time and the data block offset in the data recording process, and when the receiver receives the retransmission request of the data center, the offset address of the data block in the required time period can be quickly obtained by matching the request time and the GNSS epoch time in the index table.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings. The detailed description of the present invention is given in detail by the following examples and the accompanying drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a flow chart of a method of raw observation data recording according to the present invention;
FIG. 2 is a block diagram of a raw observation data partition structure according to an embodiment of the present invention;
FIG. 3 is a block diagram of a raw observation data recording system of the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that any combination of the embodiments or technical features described below can be used to form a new embodiment without conflict.
The original observation data recording method, as shown in fig. 1, includes the following steps:
analyzing GNSS original observation data in real time, and returning the current GNSS epoch time and the length and content of the original observation data in real time; in this embodiment, the GNSS epoch time can be accurate to one second.
As shown in fig. 2, the original observation data is recorded by adopting a partition structure sequentially including file parameter information, the original observation data, and a data index table from front to back, that is, the data index table is added behind the data area. In the conventional indexing method, a data index table is usually placed at the beginning of a file, but since file parameter information usually exists at the beginning of the file in the original observation data, and various types of GNSS calculation software perform data preprocessing through the file parameter information in front of the file, the data index table is placed at the end of a data area in the embodiment, and the processing of the GNSS calculation software on the data can be completely unaffected by the scheme.
Automatically generating file parameter information and writing the file when a file is newly built each time, writing the returned original observation data block into the file in real time, and returning the offset value of the file at the moment in real time;
establishing an index table according to the returned GNSS epoch time and the offset value of the file, storing the index table in a memory and updating the index table in real time, and writing the index table into the file when one file is closed after being recorded; in this embodiment, GNSS epoch time and offset values of files are returned every second, but the actual meaning of creating an index in units of seconds is not great, but system load is increased, and an index field is generated every 60 seconds in units of one minute in combination with a demand data index unit of actual application.
The index table is shown in table 1, assuming that the file records data of 15:00:00 to 15:59:59, 60 index values are generated in the data index table altogether, the original observed data amount per minute is assumed to be X0-X58, when a data return request of the data center is received, the time information is determined according to the file name, in this embodiment, because the data is usually a file of one hour, the file name includes specific time information, therefore, it is determined which hour of the data is specific according to the file name, the file is located by the time information, the located file is opened, the data index table at the end of the file is read, the data block offset is located according to the time information, assuming that the time end of the data required by the data center is data of 15:08:00 to 15:15:00 on a certain day, the start offset of the data block can be calculated by the index table to be X7+1024, the specific data block size is X14-X7, and after the offset and the size of the data in the file are determined, a file read-write function can be called to read all the data blocks and send the data blocks to the data center.
Table 1 index table
| GNSS epoch time | Data migration |
| 150000 | 1024 |
| 150100 | X0+1024 |
| 150200 | X1+1024 |
| ……………… | …………… |
| ………………. | …………… |
| 155900 | X58+1024 |
| 155959 | X59 |
An electronic device, comprising: a processor;
a memory; and a program, wherein the program is stored in the memory and configured to be executed by the processor, the program comprising instructions for performing the raw observation data recording method.
A computer-readable storage medium having stored thereon a computer program for executing a raw observation data recording method by a processor.
The original observation data recording system, as shown in fig. 3, includes a central decision unit, a data recording unit, a data analysis unit, a data indexing unit, and a data returning unit; wherein the content of the first and second substances,
the data analysis unit is used for analyzing the GNSS original observation data in real time and returning the current GNSS epoch time and the length and content of the original observation data in real time; GNSS epoch time can typically be accurate to one second.
And the central decision unit is used for transmitting the result returned by the data analysis unit to the data analysis unit and the data index unit in real time.
The data recording unit is used for automatically generating file parameter information and writing the file when a file is newly built every time, writing the original observation data block returned by the central decision unit into the file in real time, and simultaneously returning the offset value of the file to the central decision unit in real time;
the data index unit is used for establishing an index table according to GNSS epoch time and file offset value returned by the central decision unit, storing the index table in a memory and updating the index table in real time, and when a file is closed after being recorded, the central decision unit writes the index table into the file through the data recording unit.
In one embodiment, the central decision unit returns time and file offset values to the data indexing unit every second, but the actual meaning of establishing indexes in units of seconds is not great, and the system load is increased, and the data indexing unit produces an index field in units of one minute, namely every 60 seconds, according to the requirements of practical application.
In this embodiment, because the data is usually one-hour file, and the file name includes specific time information, it is determined which hour the data is in according to the file name, the file is located according to the time information, a data index table at the end of the file reading file is opened, a data block offset and a data block size are located according to the time information, and a file read-write function is called through the data block offset and the data block size to read out all corresponding data blocks and send the data blocks to the data center.
The invention provides a method for recording original observation data, which comprises the following steps: analyzing GNSS original observation data in real time, and returning the current GNSS epoch time and the length and content of the original observation data in real time; automatically generating file parameter information and writing the file when a file is newly built each time, writing the returned original observation data block into the file in real time, and returning the offset value of the file at the moment in real time; establishing an index table according to the returned GNSS epoch time and the offset value of the file, storing the index table in a memory and updating the index table in real time, and writing the index table into the file when one file is closed after being recorded; when a data return request of a data center is received, time information is determined according to a file name, a file is located through the time information, the located file is opened, a data index table is read, data block offset and data block size are located according to the time information, and corresponding data blocks are all read out through the data block offset and the data block size and sent to the data center. The present invention relates to an electronic device and a storage medium for executing a raw observation data recording method. The invention also relates to a system for recording the original observation data. The invention improves the recording method of the original observation data in the local reference station receiver, establishes an index table according to the GNSS epoch time and the data block offset in the data recording process, and when the receiver receives the retransmission request of the data center, the offset address of the data block in the required time period can be quickly obtained by matching the request time and the GNSS epoch time in the index table.
The foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner; those skilled in the art can readily practice the invention as shown and described in the drawings and detailed description herein; however, those skilled in the art should appreciate that they can readily use the disclosed conception and specific embodiments as a basis for designing or modifying other structures for carrying out the same purposes of the present invention without departing from the scope of the invention as defined by the appended claims; meanwhile, any changes, modifications, and evolutions of the equivalent changes of the above embodiments according to the actual techniques of the present invention are still within the protection scope of the technical solution of the present invention.
Claims (10)
1. The method for recording the original observation data is characterized by comprising the following steps of:
analyzing GNSS original observation data in real time, and returning the current GNSS epoch time and the length and content of the original observation data in real time;
automatically generating file parameter information and writing the file when a file is newly built each time, writing the returned original observation data block into the file in real time, and returning the offset value of the file at the moment in real time;
establishing an index table according to the returned GNSS epoch time and the offset value of the file, storing the index table in a memory and updating the index table in real time, and writing the index table into the file when one file is closed after being recorded;
when a data return request of a data center is received, time information is determined according to a file name, a positioned file is opened by positioning the file through the time information, a data index table is read, data block offset and data block size are positioned according to the time information, and corresponding data blocks are all read out and sent to the data center through the data block offset and the data block size.
2. The raw observation data recording method of claim 1, wherein: the GNSS epoch time is accurate to one second.
3. The raw observation data recording method of claim 1, wherein: and the original observation data adopts a partition structure which sequentially comprises file parameter information, original observation data and a data index table from front to back to record the data.
4. The raw observation data recording method of claim 2, wherein: the time for returning the current GNSS epoch in real time is specifically the time for returning the GNSS epoch per second; the offset value for returning the file at this time in real time is specifically an offset value for returning the file per second.
5. The raw observation data recording method of claim 4, wherein: the creating of the index table according to the returned GNSS epoch time and the offset value of the file is specifically to generate an index field in a unit of one minute.
6. The raw observation data recording method of claim 1, wherein: the time information is determined according to the file name, specifically, the hour is determined according to the file name, and the file is positioned according to the hour; and the step of reading all the corresponding data blocks through the data block offset and the data block size and sending the read data blocks to the data center specifically is to call a file read-write function to read all the corresponding data blocks and send the read data blocks to the data center.
7. The raw observation data recording method of claim 2, wherein: the read data index table is specifically a data index table at the end of the read file.
8. An electronic device, characterized by comprising: a processor;
a memory; and a program, wherein the program is stored in the memory and configured to be executed by the processor, the program comprising instructions for carrying out the method of any one of claims 1-7.
9. A computer-readable storage medium having stored thereon a computer program, characterized in that: the computer program is executed by a processor for performing the method according to any of claims 1-7.
10. The original observation data recording system is characterized in that: the system comprises a central decision unit, a data recording unit, a data analysis unit, a data index unit and a data return unit; wherein the content of the first and second substances,
the data analysis unit is used for analyzing the GNSS original observation data in real time and returning the current GNSS epoch time and the length and content of the original observation data in real time;
the central decision unit is used for transmitting the result returned by the data analysis unit to the data analysis unit and the data index unit in real time; when a file is recorded and closed, writing the index table into the file through the data recording unit;
the data recording unit is used for automatically generating file parameter information and writing the file when a file is newly built every time, writing the original observation data block returned by the central decision unit into the file in real time, and simultaneously returning the offset value of the file to the central decision unit in real time;
the data index unit is used for establishing an index table according to the GNSS epoch time and the file offset value returned by the central decision unit, storing the index table in a memory and updating the index table in real time;
the data returning unit is used for determining time information according to a file name when a data returning request of the data center is received, positioning a file according to the time information, opening a data index table at the tail of the file reading file, positioning data block offset and data block size according to the time information, and completely reading out corresponding data blocks through the data block offset and the data block size and sending the data blocks to the data center.
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