Threshold value determination device, threshold value determination method
A technology for determining a device and a threshold value, which is applied to measurement devices, satellite radio beacon positioning systems, instruments, etc., and can solve problems such as inability to ensure safe navigation, large errors in ephemeris data, and increased aircraft positioning errors.
Active Publication Date: 2017-04-12
NEC CORP
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Problems solved by technology
Ephemeris data is usually updated about every two hours. If wrong orbit information is broadcast during this update, the aircraft's positioning error will increase, and it may not be possible to ensure safe navigation.
[0007] Therefore, as a method of detecting orbital information errors and judging whether the orbital information is usable or not, the following method is disclosed in Non-Patent Document 1: Based on the initial value of the orbital element of the ephemeris data, using the GPS Interface Specification IS-GPS-200E The algorithm described calculates the three-dimensional position of the satellite described by the fixed coordinate system of the earth according to time series. Comparison, when the difference in position exceeds a predetermined threshold, it is judged that the error of the updated ephemeris data is large and cannot be used
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[0033] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, the scope of application of the present invention is not limited to the GBAS ground station described in this embodiment, but can be applied to various GPS devices that receive ephemeris data from a plurality of GPS satellites.
[0034] figure 1 It is a block diagram showing a schematic configuration example of a GBAS ground station in one embodiment of the present invention. In this figure, a GBAS ground station 1 has a reference station 100, a GPS satellite selection computer 200, a threshold determination computer 300, and a VHF data broadcasting device 400 including an antenna. The reference station 100 has a GPS receiving antenna 110 and a GPS receiving device 200 . The threshold determination computer 300 has an integrity threshold calculation unit 310 , a persistence threshold calculation unit 320 , and a threshold determination unit 330 .
[0035] ...
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PROBLEM TO BE SOLVED: To obtain a threshold capable of achieving both soundness of a positioning system and continuity of the positioning system in a threshold determination device which determines the threshold for selecting a GPS satellite, using the ephemeris data transmitted from the GPS satellite for positioning, from a plurality of GPS satellites.SOLUTION: A threshold determination part determines the threshold for selecting the GPS satellite based on the set maximum permissible detecting failure probability and the maximum permissible false alarm probability. Due to the maximum permissible detecting failure probability, the soundness of the positioning system can be satisfied, and due to the maximum permissible false alarm probability, the continuity of the positioning system can be satisfied.
Description
technical field [0001] The present invention relates to determining the threshold value determination device for selecting the threshold value of GPS satellites that can provide normal ephemeris data to use in positioning from a plurality of GPS (Global Positioning System, Global Positioning System) satellites, and relates to determining the threshold value for A threshold determination method and procedure for selecting thresholds of GPS satellites that can provide normal ephemeris data to use in positioning are selected from a plurality of GPS satellites. Background technique [0002] In the landing system of the aircraft, the DGPS (Differential GPS: Differential GPS) of the narrow coverage area near the airport is called GBAS, and the standards and recommendations (SARPs: Standards and Recommended) determined by ICAO (International Civil Aviation Organization: International Civil Aviation Organization) Practices, Standards and Recommended Practices), in which standards an...
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IPC IPC(8): G01S19/37G01S19/20G01S19/28
Inventor 野崎丰
Owner NEC CORP