Sun disc surface speed difference-based autonomous celestial navigation method

A technology of astronomical navigation and speed difference, applied in the direction of combined navigator, navigation calculation tool, etc., can solve the problem of reduced navigation performance, and achieve the effect of improving navigation accuracy and eliminating influence.

Active Publication Date: 2019-12-27
BEIHANG UNIV
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is: to overcome the deficiencies of the prior art, to provide an autonomous astronomical navigation method based on the sun disc velocity difference, and to solve the

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  • Sun disc surface speed difference-based autonomous celestial navigation method
  • Sun disc surface speed difference-based autonomous celestial navigation method
  • Sun disc surface speed difference-based autonomous celestial navigation method

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[0040] The present invention will be described in detail below with reference to the drawings and embodiments.

[0041] Such as figure 1 As shown, the specific implementation method of the present invention is as follows:

[0042] 1. Obtain the speed difference of the sun's circular surface;

[0043] Using four spectrometers to measure the velocities of the four perpendicular points A, B, C, and D on the solar disk surface are v respectively A ,v B ,v C ,v D ,Such as figure 2 Shown. The four spectrometers are installed at the four corners of the quadrangular pyramid, and δ is the installation angle between the spectrometer and the central axis of the quadrangular pyramid. R is the radius of the circumscribed circle of the bottom surface of the quadrangular pyramid, and h is the height of the quadrangular pyramid, so:

[0044]

[0045] Then, calculate the speed difference between the four points v A -v B ,v A -v C ,v A -v D ,v B -v C ,v B -v D ,v C -v D .

[0046] 2. Establish a meas...

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Abstract

The invention relates to a sun disc surface speed difference-based autonomous celestial navigation method. Aiming at the phenomenon that linear speeds of different points on a sun disc surface are different and the radial speeds, observed by a detector at different positions, of different sun points are different due to differential rotation of the sun, a research finds that speed information is afunction of the current position of the detector, so that the position and the speed of the detector can be estimated by using the speed information. According to the method, the radial speeds of different points on the sun disc surface are measured by using spectrometers; speed difference values between the radial speeds are calculated; a measurement model is built by taking the speed differencevalues as measured quantities; and the position and the speed of the detector are estimated by combining an orbital kinematic model with Unscented Kalman filtering. According to the sun disc surfacespeed difference-based autonomous celestial navigation method, the effects of spectrometer errors and speed changes of the sun on the navigation performance can be eliminated, so that the estimation accuracy is high.

Description

technical field [0001] The invention belongs to the field of autonomous navigation of spacecraft, and relates to an autonomous astronomical navigation method based on the sun disc velocity difference. Background technique [0002] Celestial navigation is a time-delay-free, highly reliable, fully autonomous navigation method. According to different measurements, celestial navigation can be divided into angle measurement, speed measurement and distance measurement navigation. Among them, astronomical velocity measurement and navigation obtains the relative velocity of the spacecraft and the star by observing the Doppler velocity frequency shift of the spectrum of the sun or stars, and obtains the position through velocity integration, which is an important emerging navigation method. [0003] Traditional astronomical speed measurement and navigation methods usually regard the sun as a particle when obtaining Doppler velocity measurement. However, the sun actually observed by ...

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Application Information

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IPC IPC(8): G01C21/24G01C21/20
CPCG01C21/20G01C21/24
Inventor 宁晓琳晁雯房建成吴伟仁刘刚
Owner BEIHANG UNIV
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