Geographical location information acquiring method based on MLS

Abstract

The invention provides a geographical location information acquiring method based on MLS. The method includes: acquiring MLS measuring information and airport information, and using a rotary Gauss-Legendre iteration algorithm to acquire the position of a plane in an MLS coordinate system if the MLS measuring information and the airport information are valid; or else continuing acquiring; calculating the coordinates of the plane in a geodetic coordinate system. The method has the advantages that the vulnerability and integrity problems caused by the fact that a satellite navigation receiver is affected by satellite signals can be avoided, the problem that precision shifts along with time due to the fact that an inertial navigation calculation method is used can be also avoided, and the reliability of geographical location information output of airborne equipment is guaranteed.

Description

technical field [0001] The invention belongs to the field of navigation, and relates to a land-based navigation system, in particular to a method for obtaining geographical position information (latitude, longitude and height) by using angle measurement and distance measurement information of a microwave landing system (MLS). Background technique [0002] The Microwave Landing System (MLS) is a new generation of aircraft precision approach guidance landing system. The typical ground equipment consists of azimuth, elevation and range measuring stations, which provide the azimuth relative to the azimuth station for the airborne equipment respectively. Elevation The elevation angle of the station and the distance relative to the ranging station. The azimuth station and the ranging station are generally erected at the same site and are located at the rear end of the runway exit; the elevation station is erected on the side of the runway entrance; all stations face the landing di...

AI Technical Summary

Problems solved by technology

The use of satellite navigation receivers, especially in combination with the use of differential enhanced information, can enable airborne equipment to obtain extremely high geographic location accuracy (after using real-time carrier phase difference technology, the positioning accuracy can reach centimeter level), but the satellite navigation system exists Vulnerability and integrity issues

The so-called "vulnerability" refers to the easy interference problem of the satellite navigation system. Because the distance between the satellite and the ground is too far, the signal reaching the ground is very weak and is easily interfered; the so-called integrity problem refers to the difficulty of the satellite navigation receiver to judge The real-time status of the satellite and whether the signal sent is abnormal

Affected by this, under certain conditions (such as the existence of suppressive interference and deceptive interference of satellite signals), the geographic location information output by satellite navigation receivers is unreliable

The disadvantage of using inertial reckoning is that the accuracy of inertial navigation will gradually drift over time, resulting in the gradual deterioration of the accuracy of geographic location information

[0005] At present, MLS airborne equipment at home and abroad only have the function of outputting angle and distance information, and no relevant literature reports have been found that have the function of outputting geographic location information.

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