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Doppler differential velocity model and method for combined navigation by using doppler differential velocity model and X-ray pulsar

A Doppler velocity and Doppler technology, applied in the field of autonomous navigation of deep space probes, can solve problems such as deviation of navigation speed measurement information, affecting the performance of integrated navigation systems, and instability of the solar spectrum

Inactive Publication Date: 2014-07-30
WUHAN UNIV OF SCI & TECH
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Problems solved by technology

However, in practice, the solar spectrum is not stable due to interference factors such as solar flares, prominences, and sunspots.
This will lead to a large deviation in the navigation speed measurement information in certain periods, which will affect the performance of the entire integrated navigation system

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  • Doppler differential velocity model and method for combined navigation by using doppler differential velocity model and X-ray pulsar
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  • Doppler differential velocity model and method for combined navigation by using doppler differential velocity model and X-ray pulsar

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[0056] In order to facilitate those of ordinary skill in the art to understand and implement the present invention, the present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the implementation examples described here are only used to illustrate and explain the present invention, and are not intended to limit this invention.

[0057] In this embodiment, the orbit of the Mars probe is firstly given, as shown in Table 1.

[0058] Table 1 Initial Orbital Parameters

[0059]

[0060] please see figure 1 , the embodiment provides a Doppler differential velocity measurement model, first assuming that the deep space probe is at t 1 The positions at time and time t are respectively r 1 and r, Mars at t 1 The position and velocity at time instant are r M and v M , two spectrometers are mounted on the deep space probe, the first spectrometer is at t 1 Measure the spectral frequency...

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Abstract

The invention discloses a doppler differential velocity model and a method for combined navigation by using a doppler differential velocity model and an X-ray pulsar. The doppler differential velocity model is Y<s>(t)=h<s>(X, t)+omegav, wherein omegav is doppler measurement noise; Y<s> and h<s> respectively represent a measurement value and a measurement equation; Y<s>=vD2-vD1; the equation is as shown in the specification. The method for combined navigation by using the doppler differential velocity model and the X-ray pulsar comprises the following steps: 1, building an orbital dynamics model of a deep space probe; 2, building an X-ray pulsar navigation ranging model; 3, building the doppler differential velocity model; 4, filtering by using an extended kalman filter. Compared with the prior art, the doppler differential velocity model has the advantages that (1) compared with the existing pulsar / doppler combined navigation methods, the doppler differential velocity model still can normally and stably work under an unstable solar spectrum; (2) compared with the pulsar navigation method and the doppler navigation method, a plurality of navigation messages are fully utilized by the method, the method has complete observability, and the locating information with higher precision can be provided.

Description

technical field [0001] The invention belongs to the technical field of autonomous navigation of deep space probes, and in particular relates to a Doppler differential velocity measurement model and a method for combined navigation with X-ray pulsars. Background technique [0002] For deep space probes, astronomical autonomous navigation technology is crucial. The astronomical autonomous navigation system obtains navigation information by measuring astronomical data. Celestial navigation measurement methods include angle measurement, distance measurement, and speed measurement. In the deep space exploration transfer orbit, the distance between the deep space probe and the near celestial body is very long, which will lead to the low positioning accuracy of the angle measurement navigation method, which cannot meet the high precision positioning requirements of the deep space exploration mission. The performance of ranging navigation method (namely X-ray pulsar navigation met...

Claims

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Application Information

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IPC IPC(8): G01C21/00G01C21/02
CPCG01C21/005G01C21/02
Inventor 刘劲吴谨熊凌王文武朱磊李娟
Owner WUHAN UNIV OF SCI & TECH
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