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Aerostat occultation forecast method based on inertial navigation

An aerostat and navigation star technology, applied in the field of atmospheric occultation detection, can solve the problems of insufficient accuracy, failure to consider visibility and real-time performance, waste of hardware resources, etc. The effect of misjudgment or omission

Active Publication Date: 2018-12-21
CMA METEOROLOGICAL OBSERVATION CENT +1
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0004] The existing occultation prediction algorithm mainly uses simulation software to calculate, and then puts it into the device in advance, without considering the visibility and real-time performance in practical applications, so the accuracy rate is insufficient, resulting in a waste of hardware resources

Method used

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  • Aerostat occultation forecast method based on inertial navigation
  • Aerostat occultation forecast method based on inertial navigation
  • Aerostat occultation forecast method based on inertial navigation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0062] The test scene design is: the flying height of the aerostat is 20km, and the location is

[0063] (-2244788.560, 4316130.960, 4141765.440), UTC time is from 0:00:00 on September 27, 2018 to 16:00:00 on September 27, 2018, the argument angle w of the receiving antenna of the aerostat is 40 degrees, and the antenna is installed The pitch angle is -4, and the occultation cut angle is -4.5 degrees, so the antenna pitch angle threshold is [-7.5, 16]. Since the scene is designed to be three-axis stable, the antenna and the direction of motion keep coincident, so the antenna azimuth angle threshold is [-20, 20], if the antenna has attitude maneuvering, it is necessary to introduce inertial navigation equipment, plus the change of antenna orientation caused by attitude maneuvering. With a time step of 60s, some forecast results and reception results are shown in the table below:

[0064]

[0065] Through hardware-in-the-loop simulation, the above table is obtained, which ca...

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Abstract

The invention discloses an aerostat occultation forecast method based on inertial navigation. The method comprises the following steps: acquiring location speed of all GNSS navigation stars under a WGS84 coordinate system according to positioning equipment of an occultation explorer, and then computing location speed, longitude, latitude and height of the aerostat; computing pitch angles and azimuth angles of all GNSS navigation stars and an azimuth angle of the aerostat body, judging whether the obtained pitch angle Elv, the azimuth angle Azm and antenna installation azimuth satisfy the threshold of an occultation event; if the obtained pitch angle Elv, the azimuth angle Azm and antenna installation azimuth satisfy the threshold of the occultation event, judging that the GNSS navigation star is the occultation. The occultation event is judged by adopting the continuous arc sections through the inertial navigation equipment, the accuracy of a forecast result is enhanced, the method issimple and easy to implement, and has important application value for the real-time forecast.

Description

technical field [0001] The present invention relates to the technical field of atmospheric occultation detection, in particular to an inertial navigation-based aerostat occultation prediction method, using atmospheric occultation detection equipment and initialization hardware equipment on the aerostat to predict the occurrence of occultation events in advance, for A method for quickly capturing occultation events to provide initial conditions. Background technique [0002] The success of the GPS / MET experiment has verified the great value of GNSS radio occultation technology for the detection of the earth's atmosphere. With the development of GNSS radio occultation technology, more and more countries pay attention to occultation technology. The occultation event refers to the physical change phenomenon that the navigation signal of the GNSS satellite passes through the ionosphere and atmosphere on the earth's surface and produces bending. Occultation technology refers to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C21/16G01S19/14G01V3/17G01W1/08
CPCG01C21/165G01S19/14G01V3/17G01W1/08
Inventor 杨荣康郭启云李昌兴张春泽温凯黄满义
Owner CMA METEOROLOGICAL OBSERVATION CENT
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