Lightning detection network positioning error analysis system

Abstract

The utility model discloses a positioning error analysis system for a lightning detection network. The positioning error analysis system comprises a mobile radiation source signal transmitting device, a ground receiving array and a ground control system. The system provided by the utility model evaluates the positioning error of the regional lightning detection network based on the radiation source signal transmitter carried by the unmanned aerial vehicle. A radio-frequency signal transmitting system is provided with a fixed frequency and a fixed time window to transmit radio-frequency signals to the outside. A receiving array composed of seven stations is arranged on the ground, the length of a base line is 40-100 km, and electromagnetic signals are synchronously detected and received through a receiving antenna, a sensor and an acquisition system. And then the generation time and position of the signal are inversely calculated by using an algorithm, and the real positioning error of the lightning detection network is finally obtained through comparison of GPS position information sent back by the low-altitude unmanned aerial vehicle. The system reflects the positioning precision of the regional lightning detection network and the credibility of the positioning result from different sides, and provides a scientific basis for the design of the lightning positioning network and the adjustment of parameters.

Description

Technical Field

[0001] The utility model relates to the technical field of radio detection of lightning in severe convective weather, and in particular to an evaluation of positioning error of a lightning monitoring network based on a time arrival method for solving lightning spatiotemporal parameters, in particular to a lightning detection network positioning error analysis system. Background Art

[0002] Lightning is one of the important meteorological disasters. Due to its instantaneous, random and high current characteristics, it often causes casualties and damage to electronic equipment. Therefore, lightning monitoring and early warning are an important part of the meteorological business department. To do a good job in lightning monitoring and early warning, the problem that needs to be solved urgently is the accuracy of the lightning detection system. The current lightning detection system is mainly operated in a station-based manner. The mainstream methods of lightning positioning are divided into time arrival method and interference method. The current positioning network mainly uses the time arrival method to complete the inversion of lightning radiation sources. Since any positioning system that uses the time arrival method to invert the spatiotemporal parameters of lightning cannot be absolutely accurate, positioning errors always exist. Therefore, reducing the uncertainty of the target position is an urgent problem that needs to be solved by the lightning positioning system.

[0003] For lightning location systems, there are many sources of positioning errors, such as time measurement error, angle measurement error, arrival time error caused by not considering the influence of terrain undulation and conductivity change on electromagnetic wave propagation, calculation error caused by not considering the curvature and flattening of the earth in the calculation model, etc. Among the above-mentioned influencing factors, time measurement error is the main source of error. Therefore, it is given priority consideration in error analysis. The use of radiation source signal generators carried on balloons can be used to correct errors in lightning detection networks. However, due to the limitations of balloons themselves, such as the load, flight altitude, and trajectory of balloons, which are greatly affected by wind, it is difficult to make a good assessment of the network with a baseline range of more than tens of kilometers.

[0004] Therefore, based on the technical problems existing in the error assessment of the lightning location network mentioned above, a radiation source lightning network error assessment system based on low-altitude drones was developed. Not only can the lightning location network's near-real positioning error be obtained, but also the real positioning error of the lightning location network can be actively assessed, which helps to understand the initiation process of thunderstorms and the dynamic and microphysical processes of thunderstorm clouds. Utility Model Content

[0005] The purpose of the utility model is to provide a lightning detection network positioning error analysis system, which uses lightning-related detection equipment and systems to obtain the accurate position and time of lightning strikes, and then compares it with the lightning strike points obtained by multi-station inversion to obtain the real positioning error of the lightning detection network. First, a wireless radio frequency signal transmitter is mounted directly below a low-altitude drone, and a transmitter that can transmit GPS location information in real time is also mounted; then, the remote-controlled drone flies according to a certain trajectory, and during the flight, it regularly transmits radio frequency signals and GPS location information to the outside; then, the measuring stations distributed on the ground are used to detect signals in real time. As long as more than 5 measuring stations receive the radio frequency signal at the same time, the collected signal is transmitted to the central measuring station in real time for processing and analysis; finally, the solution result is compared with the received signal source GPS position and time, and finally the real positioning error of the lightning detection network is obtained. After the above process, the results of the positioning error evaluation can provide a scientific basis for the design of the lightning positioning network and the adjustment of parameters.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] The utility model provides a lightning detection network positioning error analysis system, the error analysis system comprising:

[0008] Mobile radiation source signal transmitting device, ground receiving array and ground control system;

[0009] The mobile radiation source signal transmitting device is hoisted directly below the low-altitude UAV;

[0010] The mobile radiation source signal transmitting device comprises a dedicated radio frequency signal generator, a radio frequency signal enhancer, a radio frequency signal transmitter, a micro solar panel, a photoelectric converter, a large-capacity lithium battery and a Beidou GPS.

[0011] Furthermore, the ground receiving array comprises:

[0012] Radiation source receiving system, data acquisition system, data processing system, transmission system and central station processing system.

[0013] Further, the radiation source receiving system includes a flat antenna, a sensor conditioning circuit and a signal transmission line;

[0014] The data acquisition system includes a high-precision acquisition card, a high-performance industrial computer and acquisition software;

[0015] The data processing system includes radiation source pulse peak time identification software, radiation source pulse peak amplitude identification software, radiation source pulse peak type identification software and key data extraction software;

[0016] The central station processing system includes a multi-station matching system, an algorithm system and a result publishing system.

[0017] In the above technical solution, the utility model provides a lightning detection network positioning error analysis system, which has the following beneficial effects:

[0018] The system of the utility model evaluates the positioning error of the regional lightning detection network based on the radiation source signal transmitter carried by the unmanned aerial vehicle. Using radio technology, the radio frequency signal transmitter is carried on a low-altitude controllable unmanned aerial vehicle. A fixed frequency and a fixed time window are set in the radio frequency signal transmission system to transmit radio frequency signals to the outside. A receiving array consisting of 7 stations is laid out on the ground, with a baseline length of 40-100km. The electromagnetic signal is synchronously detected and received using a receiving antenna, a sensor and an acquisition system. The time and position of the signal are then solved by algorithm inversion, and the real positioning error of the lightning detection network is finally obtained by comparing the GPS position information sent back by the low-altitude unmanned aerial vehicle. The system can be designed according to the actual situation, reflecting the positioning accuracy of the regional lightning detection network and the credibility of the positioning results from different aspects, providing a scientific basis for the design of the lightning positioning network and the adjustment of parameters.

[0019] The system of the utility model is based on the long-baseline regional lightning location network platform, and provides favorable conditions for evaluating the location error of the lightning location network by designing a targeted experimental system. At the same time, the accurate correction of the location error of the lightning location network can obtain lightning information close to the real thing, which not only provides important technical support for in-depth research on the origination mechanism, dynamic process and microphysical process of lightning, but also provides a theoretical basis for the optimization and adjustment of the currently developed lightning location network, and provides one of the important technical means for the early warning and forecasting of lightning disasters. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. It is obvious that the drawings described below are only some embodiments recorded in the present utility model. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0021] Figure 1 A multi-station time difference positioning principle of a lightning detection network positioning error analysis system disclosed in an embodiment of the utility model;

[0022] Figure 2 A schematic diagram of an air-to-ground working link of a lightning detection network positioning error analysis system disclosed in an embodiment of the utility model;

[0023] Figure 3An airborne wireless electromagnetic signal sending and receiving method of a lightning detection network positioning error analysis system disclosed in an embodiment of the utility model;

[0024] Figure 4 The working principle of a mobile radiation source signal transmitting device of a lightning detection network positioning error analysis system disclosed in an embodiment of the utility model;

[0025] Figure 5 The invention discloses a working principle of a ground receiving array of a lightning detection network positioning error analysis system.

[0026] Description of reference numerals:

[0027] 1. Mobile radiation source signal transmitter; 2. Ground receiving array; 3. Ground control system; 4. Low-altitude UAV; 5. Target; 6. Transmission distance; 7. Receiving antenna; 8. Time fitting curve;

[0028] 11. Dedicated RF signal generator; 12. RF signal booster; 13. RF signal transmitter; 14. Micro solar panel; 15. Photoelectric converter; 16. Large-capacity lithium battery; 17. Beidou GPS;

[0029] 21. Radiation source receiving system; 22. Data processing system; 23. Data acquisition system; 24. Transmission system; 25. Central station processing system;

[0030] 211. Flat antenna; 212. Sensor conditioning circuit; 213. Signal transmission line;

[0031] 221. High-precision acquisition card; 222. High-performance industrial computer; 223. Specialized acquisition software;

[0032] 231. Radiation source pulse peak time identification software; 232. Radiation source pulse peak amplitude identification software; 233. Radiation source pulse peak type identification software; 234. Key data extraction software;

[0033] 251. Multi-station matching system; 252. Algorithm system; 253. Result publishing system. DETAILED DESCRIPTION

[0034] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0035] See also Figures 1 to 5 As shown;

[0036] A lightning detection network positioning error analysis system of this embodiment includes:

[0037] A mobile radiation source signal transmitting device 1, a ground receiving array 2 and a ground control system 3;

[0038] The mobile radiation source signal transmitting device 1 is hoisted directly below the low-altitude UAV 4;

[0039] The mobile radiation source signal transmitting device 1 includes a dedicated radio frequency signal generator 11, a radio frequency signal enhancer 12, a radio frequency signal transmitter 13, a micro solar panel 14, a photoelectric converter 15, a large-capacity lithium battery 16 and a Beidou GPS 17.

[0040] Specifically, this embodiment discloses a positioning error analysis system for evaluating a lightning detection network based on an active radio signal method, which is designed by designing a high-power mobile radiation source signal transmitting device 1, such as adding a radio frequency signal enhancer 12 and a radio frequency signal transmitter 13. In order to ensure the long battery life of the signal source, a solar real-time charging system is designed, including a micro solar panel 14, a photoelectric converter 15 and a large-capacity lithium battery 16.

[0041] During the implementation process, the airborne radiation source signal generator receives the command sent by the ground control system 3, flies according to the predetermined trajectory, and sends radio frequency signals at a fixed time and frequency. The antenna array of the ground receiving array 2 receives the radio frequency signal sent from the airborne, and after data collection and data processing, the radiation source pulse peak time, amplitude and type are identified, and then sent to the central measurement station through the transmission system for solution, and finally the time and space parameters of the radio frequency signal are obtained. Combined with the real-time position information sent by the low-altitude UAV, the real positioning error of the ground array is obtained by comparison.

[0042] Preferably, the ground receiving array 2 of this embodiment includes:

[0043] Radiation source receiving system 21, data acquisition system 22, data processing system 23, transmission system 24 and central station processing system 25.

[0044] Preferably, the radiation source receiving system 21 of this embodiment includes a flat antenna 211, a sensor conditioning circuit 212 and a signal transmission line 213;

[0045] The data acquisition system 22 includes a high-precision acquisition card 221, a high-performance industrial computer 222 and acquisition software 223;

[0046] The data processing system 23 includes a radiation source pulse peak time identification software 231, a radiation source pulse peak amplitude identification software 232, a radiation source pulse peak type identification software 233 and a key data extraction software 234;

[0047] The central station processing system 25 includes a multi-station matching system 251 , an algorithm system 252 and a result publishing system 253 .

[0048] As a preferred implementation, the system of this embodiment is based on the mobile radiation source signal transmitting device 1, using the time difference principle of the signal arriving at different positions, and obtaining the approximate position of the lightning through fitting calculation, and then using the advantage of the accurate position of the low-altitude drone 4 to obtain the real positioning error of the lightning positioning network in the area. The system can not only accurately and quickly correct the positioning error, and adjust and optimize the station layout of its lightning detection network, but also provide great convenience for measuring natural lightning and thunderstorm electromagnetic environment in different regions.

[0049] In the above technical solution, the utility model provides a lightning detection network positioning error analysis system, which has the following beneficial effects:

[0050] The system of the utility model is based on a radiation source signal transmitter carried by an unmanned aerial vehicle. The scheme can be designed according to the actual situation, reflecting the positioning accuracy of the regional lightning detection network and the credibility of the positioning results from different aspects, providing a scientific basis for the design of the lightning positioning network and the adjustment of parameters.

[0051] The system of the utility model is based on the long-baseline regional lightning location network platform, and provides favorable conditions for evaluating the location error of the lightning location network by designing a targeted experimental system. At the same time, the accurate correction of the location error of the lightning location network can obtain lightning information close to the real thing, which not only provides important technical support for in-depth research on the origination mechanism, dynamic process and microphysical process of lightning, but also provides a theoretical basis for the optimization and adjustment of the currently developed lightning location network.

[0052] The above only describes some exemplary embodiments of the present invention by way of illustration. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A lightning detection network positioning error analysis system, characterized in that: The error analysis system includes: A mobile radiation source signal transmitting device (1), a ground receiving array (2) and a ground control system (3); The mobile radiation source signal transmitting device (1) is hoisted directly below the low-altitude UAV (4); The mobile radiation source signal transmitting device (1) comprises a dedicated radio frequency signal generator (11), a radio frequency signal enhancer (12), a radio frequency signal transmitter (13), a micro solar panel (14), a photoelectric converter (15), a large-capacity lithium battery (16) and a Beidou GPS (17).

2. A lightning detection network positioning error analysis system according to claim 1, characterized in that: The ground receiving array (2) comprises: Radiation source receiving system (21), data acquisition system (22), data processing system (23), transmission system (24) and central station processing system (25).

3. A lightning detection network positioning error analysis system according to claim 2, characterized in that: The radiation source receiving system (21) comprises a flat antenna (211), a sensor conditioning circuit (212) and a signal transmission line (213); The data acquisition system (22) comprises a high-precision acquisition card (221), a high-performance industrial computer (222) and acquisition software (223); The data processing system (23) comprises radiation source pulse peak time identification software (231), radiation source pulse peak amplitude identification software (232), radiation source pulse peak type identification software (233) and key data extraction software (234); The central station processing system (25) includes a multi-station matching system (251), an algorithm system (252) and a result publishing system (253).

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