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Availability Evaluation Method for Navigation Satellite Constellation Based on Dynamic Reliability Estimation

A navigation satellite and reliability technology, applied in the field of satellite navigation, can solve problems such as satellite failure, incompleteness, degradation, etc., and achieve the effects of high reliability constellation availability, real evaluation results, and simple methods

Active Publication Date: 2019-05-24
BEIJING INST OF SPACECRAFT SYST ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As the satellites are in orbit, the satellites may fail or degrade at any time. Therefore, there are inaccurate and incomplete problems in estimating the constellation availability based on the constellation configuration design alone, and there is a problem that the constellation availability cannot be evaluated in real time.

Method used

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  • Availability Evaluation Method for Navigation Satellite Constellation Based on Dynamic Reliability Estimation
  • Availability Evaluation Method for Navigation Satellite Constellation Based on Dynamic Reliability Estimation
  • Availability Evaluation Method for Navigation Satellite Constellation Based on Dynamic Reliability Estimation

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Experimental program
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Embodiment

[0117] It is known that the design life y of a certain satellite is 10 years, and the estimated reliability R of the satellite is 0.6 (10 years). At present, the satellite has been in orbit for 5 years, and everything on the satellite is normal; the current remaining propellant is 105kg, and the satellite consumes 10kg-15kg of propellant every year. The sum of the errors is 20kg; the current power is 2480W, the annual attenuation rate of the solar cell array is 50W-80W, and the lower limit of the power is 2000W. In the degradation failure, only the attenuation factor of the solar cell array is considered. Based on the current state, the remaining lifetime and distribution of the satellite are predicted as follows.

[0118] 1) Define the number of simulations as 100,000 times, and the statistical interval as 1 month. Considering the current remaining amount of propellant, set the simulation time to 10 years.

[0119] 2) Assuming that the satellite obeys the exponential distr...

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Abstract

The invention discloses a navigation satellite constellation availability assessment method based on the dynamic reliability estimation. The navigation satellite constellation availability assessment method comprises the steps of introducing a random failure factor, a degradation failure factor and a consumption failure factor of a satellite according to current operation data of an in-orbit constellation to establish a dynamic reliability estimation model and obtaining a time-varying curve of the single-star fault rate according to reliability estimation; then calculating out the constellation fault probability Pk,n (t) and the constellation inherent availability CVn,k value of an n kind of fault combination in the situation where k satellites in M satellites in the constellation are in fault; finally calculating out a time-varying relation of the constellation service availability of the navigation satellite system according to the Pk,n(t) and the CVn,k. The navigation satellite constellation availability assessment method can predict in-orbit reliability of the satellites in real time, can obtain high-accuracy and high-reliability satellite constellation availability and can solve the problems that a method only relying on a constellation configuration design to calculate out constellation availability is inaccurate and incomplete and cannot assess the constellation availability in real time.

Description

technical field [0001] The invention relates to a method for evaluating the availability of a navigation satellite constellation based on dynamic reliability estimation, and belongs to the field of satellite navigation. Background technique [0002] With the continuous advancement of navigation technology, the global navigation system is constantly developing, and the performance evaluation system of the navigation system is also constantly improving. Whether the navigation system can provide reliable and stable services is an important criterion for evaluating the performance of the navigation system, which can be measured by the service availability of the satellite constellation. The availability of navigation satellite constellations directly affects the quality of services provided to users and the implementation of satellite disposal strategies after the end of life, and is an important issue of general concern to system manufacturers, operators, insurers, and users. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 王璐翟君武赵海涛袁莉芳李美红颜灵伟陈炜钊胡旭华杨慧韩洪波
Owner BEIJING INST OF SPACECRAFT SYST ENG
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