Satellite-borne occultation real-time forecasting method

Abstract

The invention discloses a satellite-borne occultation real-time forecasting method. The method comprises the steps of: obtaining the position velocity of a spacecraft according to the positioning device of an occultation detector; calculating the orbit parameter of the spacecraft; calculating the position velocity of the spacecraft and all navigation stars after 10s; calculating the pitch angle, the azimuth angle, the tangent point height of all navigation stars and the antenna azimuth angle of the spacecraft; judging whether the obtained pitch angle Elv, the tangent point height Hight and theantenna azimuth angle satisfy the threshold of the occultation event extrapolating the time for 30 s and 1 min, repeating the above calculation and determination processes if satisfied; and determining that the navigation star is the occultation if all are satisfied. The method of the invention adopts a continuous arc to judge the occultation event through an inertial navigation device, and enhances the accuracy of the forecasting result. The method is simple and easy to implement, and has important application value for real-time forecasting.

Description

technical field [0001] The present invention relates to the technical field of atmospheric occultation detection, in particular to a spaceborne real-time occultation prediction method, which utilizes spaceborne atmospheric occultation detection equipment and initialized hardware equipment to predict the occurrence of occultation events in advance and provide initial information for quickly capturing occultation events. condition method. 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 the tech...

AI Technical Summary

Problems solved by technology

[0004] The existing occultation prediction algorithm is mainly calculated by using simulation software, and then placed in 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

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