CN214473984U - Measuring system for satellite positioning precision of railway site - Google Patents
Measuring system for satellite positioning precision of railway site Download PDFInfo
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- CN214473984U CN214473984U CN202022458114.4U CN202022458114U CN214473984U CN 214473984 U CN214473984 U CN 214473984U CN 202022458114 U CN202022458114 U CN 202022458114U CN 214473984 U CN214473984 U CN 214473984U
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Abstract
The application discloses measurement system of satellite positioning precision of railway scene, including antenna, signal reception equipment and signal processing equipment. The antenna is used for receiving a plurality of satellite signals; the signal receiving equipment is in signal connection with the antenna and is used for receiving the satellite signals received by the antenna, storing satellite data carried by the satellite signals and displaying the satellite data; the signal processing equipment is used for receiving the satellite data and obtaining and outputting precision data based on the satellite data, so that the train control system can effectively control the train according to the precision.
Description
Technical Field
The application relates to the technical field of satellite navigation, in particular to a measurement system for satellite positioning precision of a railway site.
Background
At present, a train control system generally controls a train based on satellite positioning data, and in a low-density railway system, the satellite positioning data obtained by the existing train control system can well effectively control the train; on medium-density and high-density lines, the precision of the satellite positioning data is reduced due to more complex and serious environment shielding and multipath effects, and at the moment, the train control system cannot realize effective control on the train according to the satellite positioning data.
The inventor of the application finds in practice that in order to apply satellite positioning data to medium-density and high-density lines, it is necessary to measure precision data of railway on-site satellite positioning, and the train control system can obtain accurate positioning information by combining the precision data with real-time positioning data, thereby realizing effective control of the train.
SUMMERY OF THE UTILITY MODEL
In view of the above, the present application provides a system for measuring precision of satellite positioning in a railway field, which is used to measure precision data of satellite positioning in a railway field, so that a train control system can effectively control a train according to the precision data.
In order to achieve the above object, the following solutions are proposed:
a measurement system of satellite positioning accuracy in a railway field, comprising an antenna, a signal receiving device and a signal processing device, wherein:
the antenna is used for receiving a plurality of satellite signals;
the signal receiving equipment is in signal connection with the antenna and is used for receiving the satellite signals received by the antenna, storing satellite data carried by the satellite signals and displaying the satellite data;
the signal processing device is used for receiving the satellite data and outputting precision data to a train control system based on the satellite data.
Optionally, the antenna is a multimode satellite navigation terminal antenna.
Optionally, the signal receiving device includes a pre-amplification circuit, a digital logic unit, a first processor, a first memory, a display, and an interface circuit, where:
the pre-amplification circuit is respectively in signal connection with the antenna and the digital logic unit;
the first processor is respectively in signal connection with the digital logic unit, the first memory, the display and the interface circuit;
the interface circuit is also in signal connection with the signal processing device.
Optionally, the signal receiving apparatus is configured to perform the following operations:
resolving the known satellite ephemeris to obtain a plurality of visible positioning satellites at the current time and the current position and satellite sequences thereof;
acquiring a satellite signal of each visible positioning satellite from an antenna signal according to the satellite sequence, and calculating each satellite signal to obtain a plurality of satellite positioning data corresponding to the visible positioning satellites;
storing a PRN sequence corresponding to each of the visible positioning satellites, ephemeris information, a current time, the satellite positioning data, and a number of the visible positioning satellites.
Optionally, the signal processing apparatus includes at least a second processor and a second memory in signal connection with the second processor, the second memory is used for storing a computer program or instructions, and the second processor is used for executing the computer program or instructions to implement the following method:
obtaining the PRN sequence, the ephemeris information, the current time, the satellite positioning data, and a number of the visible positioning satellites corresponding to each of the visible positioning satellites;
rejecting visible positioning satellites with elevation angles lower than a preset elevation angle threshold value, and rejecting visible positioning satellites with signal-to-noise ratios lower than a preset signal-to-noise ratio threshold value;
and performing precision calculation according to the remaining RPN sequences of the visible positioning satellites, the ephemeris information, the current time and the satellite positioning data to obtain and display the precision data.
Optionally, the precision data includes a horizontal component precision factor, a vertical component precision factor, a position precision factor, a geometric precision factor, and a clock error precision factor.
According to the technical scheme, the measuring system for the satellite positioning precision of the railway site comprises an antenna, signal receiving equipment and signal processing equipment. The antenna is used for receiving a plurality of satellite signals; the signal receiving equipment is in signal connection with the antenna and is used for receiving the satellite signals received by the antenna, storing satellite data carried by the WeChat signals and displaying the satellite data; the signal processing equipment is used for receiving the satellite data and obtaining and outputting precision data based on the satellite data, so that the train control system can effectively control the train according to the precision.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a block diagram of a measurement system for satellite positioning accuracy in a railway field according to an embodiment of the present application;
fig. 2 is a block diagram of another measurement system for satellite positioning accuracy in a railway field according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Examples
Fig. 1 is a block diagram of a measurement system for satellite positioning accuracy in a railway field according to an embodiment of the present application.
As shown in fig. 1, the measurement system provided in this embodiment is used for detecting the satellite positioning accuracy of a specific satellite navigation system at a railway site, and is disposed on a train, and specifically includes an antenna 10, a signal receiving device 20, and a signal processing device 30, where the signal receiving device is connected to the antenna and the signal processing device, respectively.
The antenna can be a multi-mode satellite navigation terminal antenna, so that the system can be adapted to various satellite navigation systems, such as a Chinese Beidou navigation system, a U.S. GPS navigation system, a European Galileo navigation system, a Russian glonass navigation system and the like.
The signal receiving device is used for acquiring a satellite signal received by the antenna, and acquiring and resolving the satellite signal to obtain satellite data carried by the satellite signal, wherein the satellite data includes, but is not limited to, the number of visible positioning satellites, a PRN sequence of each visible positioning satellite, ephemeris information, current time, and satellite positioning data of the corresponding positioning satellite.
The signal receiving apparatus specifically includes a pre-amplification circuit 21, a digital logic unit 22, a first processor 23, a first memory 24, a display 25, and an interface circuit 26, as shown in fig. 2. The pre-amplifying circuit is respectively connected with the antenna and the digital logic unit through signals; the first processor is respectively in signal connection with the digital logic unit, the first memory, the display and the interface circuit; the interface electric connection is also in signal connection with the signal processing equipment.
The signal receiving equipment realizes the processing of satellite signals by the following steps:
the method comprises the following steps: the first processor resolves the PRN sequence of the current visible positioning satellite according to the satellite ephemeris.
Step two: a search is performed based on the resolved PRN sequence.
Step three: the PRN sequence of the current visible positioning satellite is searched for at the current local carrier frequency.
Step four: the digital logic circuit adopts FFT (fast Fourier transform) mode to carry out frequency acquisition.
Step five: judging whether a satellite signal is captured or not, if not, executing a sixth step; if so, step seven is performed.
Step six: and adjusting the local carrier frequency, and then returning to the step three.
Step seven: and tracking the satellite signals by adopting a Kalman filtering algorithm and calculating satellite positioning data.
Step eight: judging whether a complete satellite PRN sequence is searched, if not, returning to the step two; if yes, executing step nine;
step nine: and recording the searched PRN sequences, the number, the ephemeris information, the local current time and other data of the available positioning satellites to a first memory.
Step ten: and displaying the information on a display screen.
The signal processing device may be specifically implemented by a computer, a server, or a tablet computer, and runs a corresponding computer program or instructions, and is configured to obtain data of the PRN sequences, the number, ephemeris information, local current time, and the like of the available positioning satellites from the signal receiving device, and obtain and display accuracy data based on the data.
The signal processing device comprises at least a second processor and a second memory, both connected by a data bus. The second processor accomplishes the above-mentioned object by executing a computer program or instructions stored in the second memory. The treatment process comprises the following steps:
the method comprises the following steps: reading data stored in a first memory and storing the data in a local database;
step two: calculating low signal-to-noise ratio satellites in the data, namely removing visible positioning satellites with signal-to-noise ratios lower than a preset signal-to-noise ratio threshold value;
step three: calculating low elevation angle satellites in the data, namely removing visible positioning satellites with elevation angles lower than a preset elevation angle threshold value;
step four: and calculating based on the data of the rest visible positioning satellites, calculating the positioning position, the horizontal component precision factor, the vertical component precision factor, the position precision factor, the geometric precision factor and the clock error precision factor at the moment, and recording the data into a database.
Various accuracy data may be obtained from the database while the train control system is operating.
It can be seen from the above technical solutions that the present embodiment provides a measurement system for satellite positioning accuracy in a railway field, which includes an antenna, a signal receiving device, and a signal processing device. The antenna is used for receiving a plurality of satellite signals; the signal receiving equipment is in signal connection with the antenna and is used for receiving the satellite signals received by the antenna, storing satellite data carried by the WeChat signals and displaying the satellite data; the signal processing equipment is used for receiving the satellite data and obtaining and outputting precision data based on the satellite data, so that the train control system can effectively control the train according to the precision.
The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
As will be appreciated by one of skill in the art, embodiments of the present application may be provided as a method, apparatus, or computer program product. Accordingly, embodiments of the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, embodiments of the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
Embodiments of the present application are described with reference to flowchart illustrations and/or block diagrams of methods, terminal devices (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing terminal to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing terminal to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing terminal to cause a series of operational steps to be performed on the computer or other programmable terminal to produce a computer implemented process such that the instructions which execute on the computer or other programmable terminal provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present application have been described, additional variations and modifications of these embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including the preferred embodiment and all such alterations and modifications as fall within the true scope of the embodiments of the application.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or terminal that comprises the element.
The technical solutions provided by the present application are introduced in detail, and specific examples are applied in the description to explain the principles and embodiments of the present application, and the descriptions of the above examples are only used to help understanding the method and the core ideas of the present application; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
Claims (6)
1. A measurement system for satellite positioning accuracy of railway site is characterized by comprising an antenna, a signal receiving device and a signal processing device, wherein:
the antenna is used for receiving a plurality of satellite signals;
the signal receiving equipment is in signal connection with the antenna and is used for receiving the satellite signals received by the antenna, storing satellite data carried by the satellite signals and displaying the satellite data;
the signal processing device is used for receiving the satellite data and outputting precision data to a train control system based on the satellite data.
2. The measurement system of claim 1, wherein the antenna is a multimode satellite navigation terminal antenna.
3. The measurement system of claim 1, wherein the signal receiving device comprises a pre-amplification circuit, a digital logic unit, a first processor, a first memory, a display, and an interface circuit, wherein:
the pre-amplification circuit is respectively in signal connection with the antenna and the digital logic unit;
the first processor is respectively in signal connection with the digital logic unit, the first memory, the display and the interface circuit;
the interface circuit is also in signal connection with the signal processing device.
4. The measurement system of claim 1, wherein the signal receiving device is to:
resolving the known satellite ephemeris to obtain a plurality of visible positioning satellites at the current time and the current position and satellite sequences thereof;
acquiring a satellite signal of each visible positioning satellite from an antenna signal according to the satellite sequence, and calculating each satellite signal to obtain a plurality of satellite positioning data corresponding to the visible positioning satellites;
storing a PRN sequence corresponding to each of the visible positioning satellites, ephemeris information, a current time, the satellite positioning data, and a number of the visible positioning satellites.
5. A measuring system according to claim 4, wherein the signal processing device comprises at least a second processor and a second memory in signal connection with the second processor, the second memory for storing computer programs or instructions, the second processor for executing the computer programs or instructions to implement the method of:
obtaining the PRN sequence, the ephemeris information, the current time, the satellite positioning data, and a number of the visible positioning satellites corresponding to each of the visible positioning satellites;
rejecting visible positioning satellites with elevation angles lower than a preset elevation angle threshold value, and rejecting visible positioning satellites with signal-to-noise ratios lower than a preset signal-to-noise ratio threshold value;
and performing precision calculation according to the remaining RPN sequences of the visible positioning satellites, the ephemeris information, the current time and the satellite positioning data to obtain and display the precision data.
6. The measurement system of claim 5, wherein the accuracy data comprises a horizontal component accuracy factor, a vertical component accuracy factor, a position accuracy factor, a geometric accuracy factor, and a clock accuracy factor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022458114.4U CN214473984U (en) | 2020-10-29 | 2020-10-29 | Measuring system for satellite positioning precision of railway site |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022458114.4U CN214473984U (en) | 2020-10-29 | 2020-10-29 | Measuring system for satellite positioning precision of railway site |
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| CN214473984U true CN214473984U (en) | 2021-10-22 |
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| CN202022458114.4U Active CN214473984U (en) | 2020-10-29 | 2020-10-29 | Measuring system for satellite positioning precision of railway site |
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Effective date of registration: 20211117 Address after: 102613 No.456, langlongsi village, Huangcun Town, Daxing District, Beijing Patentee after: BEIJING RAILWAY SIGNAL Co.,Ltd. Address before: 102613 No.456, langlongsi village, Huangcun Town, Daxing District, Beijing Patentee before: Rail Transit Technology Research Institute of Tonghao (Beijing) Rail Industry Group Co.,Ltd. Patentee before: China Communications (Beijing) Railway Industry Group Co., Ltd |