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X-ray pulsar navigation method based on dynamic pulse accumulation window

A pulsar navigation and dynamic pulse technology, which is applied in the field of X-ray pulsar navigation, can solve the problems of long measurement interval, affecting the accuracy of navigation measurement, deviation of photon TOA conversion, etc.

Active Publication Date: 2017-11-07
BEIJING INST OF CONTROL ENG
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Problems solved by technology

However, combined with the current practical application situation, the main problem is: the measurement interval is long, the pulse accumulation is fixed, and the pulse accumulation is used for measurement update
On the other hand, due to the long measurement interval, the orbit extrapolation error will continue to increase during the measurement interval, resulting in a deviation in the photon TOA conversion, which in turn causes the cumulative error of the pulse profile, directly affecting the final navigation measurement accuracy

Method used

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specific Embodiment approach

[0084] The invention provides an X-ray pulsar navigation method based on a dynamic pulse accumulation window, improves the utilization efficiency of navigation observation information and measurement update frequency, and improves the accuracy and stability of X-ray pulsar navigation. The equipment relied on by the method includes an X-ray navigation sensor, an on-board computer and other auxiliary equipment. The main calculation process is attached figure 1 , including initialization stage, photon measurement processing stage, pulse profile dynamic accumulation stage, TDOA solution stage, filter estimation stage, etc. The specific implementation is as follows:

[0085] (1) Initialization phase

[0086] (1) Set photon measurement parameters, including: current accumulation initial time t 0 ;Signal period T of the pulsar emitting photons p , referred to as the pulse signal period, T p is a positive number; the number of time windows in each pulse cycle N b , N b is a pos...

Embodiment

[0152] The spacecraft orbit refers to the GEO satellite data, and the characteristic parameters such as pulsar selection and pulsar navigation sensor parameters are shown in Table 1:

[0153] Table 1 X-ray pulsar navigation characteristic parameters

[0154]

[0155]

[0156] The simulation is carried out according to the parameter settings in Table 1, and the time course of the navigation measurement TDOA output is as attached image 3 , where 1000s at the beginning of the simulation is taken as an example, and the navigation measurement output flags of the traditional fixed accumulation window method and the dynamic accumulation window method of the present invention are compared. The flag is "1" indicating that there is navigation measurement output, and "0" indicates that there is no navigation measurement output. attached image 3 The upper part is the fixed accumulation window method, and the lower part is the dynamic accumulation window method. It can be clearl...

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Abstract

The invention relates to an X-ray pulsar navigation method based on a dynamic pulse accumulation window, belongs to the fields of spacecraft guidance, navigation and control, and is different from a mode that an X-ray pulsar photonic signal is subjected to fixed window accumulation in a present X-ray pulsar navigation method. The X-ray pulsar navigation method provided by the invention adopts the dynamically arranged pulse accumulation window, so that the position of the accumulation window can be synchronously regulated with a filtering recursive calculation process according to the needs of a signal accumulation signal-to-noise ratio and observation updating frequency along with the update of the X-ray photon pulse sampling; meanwhile, pulse profile cumulative data is updated, and the navigation observation updating frequency is improved. According to the X-ray pulsar navigation method, the problems that the random error cannot be effectively restrained, the orbit extrapolation error has great influence, the arrangement of the pulse accumulation window is inflexible and the like in the traditional X-ray pulsar photonic signal fixed window accumulation mode are effectively solved, and the navigation accuracy and stability are improved.

Description

technical field [0001] The invention relates to an X-ray pulsar navigation method based on a dynamic pulse accumulation window, belonging to the field of spacecraft guidance, navigation and control. Background technique [0002] X-ray pulsars can emit X-ray pulse signals with a stable period, and are ideal sources for navigating celestial bodies. They are known as "lighthouses in the universe" and "celestial clocks in nature". The pulse arrival time observation on the spacecraft reflects the projection of the spacecraft inertial position vector on the pulsar line of sight vector, which can be used to determine the position and velocity of the spacecraft. In recent years, X-ray pulsar navigation has become a research hotspot in the field of spacecraft autonomous navigation, and the theoretical methods have been continuously improved. At the same time, X-ray detector technology has also developed rapidly. While the detection sensitivity has been improved, its mass and volume ...

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Application Information

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IPC IPC(8): G01C21/02
CPCG01C21/025
Inventor 石恒熊凯徐超魏春岭王磊梅志武
Owner BEIJING INST OF CONTROL ENG
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