ARAIM application-oriented low earth orbit satellite enhancement system constellation configuration optimization method

Abstract

The invention provides an ARAIM application-oriented low-orbit satellite enhancement system constellation configuration optimization method, which comprises the following steps of: 1, traversing all subset solutions and vertical protection levels after fault modes under the condition of determining equal distribution of integrity risks and continuity risks, and determining constraint conditions of low-orbit satellite constellation configuration parameters, 2, determining objective functions of parameters x1, x2, x3 and x4 configured by the low-orbit satellite constellation, eliminating abnormal vertical protection level calculation values, and screening initial populations of the parameters x1, x2, x3 and x4, 3, performing fitness calculation on the objective functions of the parameters x1, x2, x3 and x4 configured by the low-orbit satellite constellation; 4, combining the parent population and the offspring population from the second generation population to form a new offspring population; and 5, performing local optimal selection on the new offspring population, screening out the maximum value of the target function as an optimal offspring, and repeating the step 4 until the genetic algebra is smaller than the maximum genetic algebra. According to the invention, the vacancy of integrity monitoring of the low-orbit enhanced system is made up, and the availability of an ARAIM airborne receiver is improved.

Description

technical field [0001] The invention relates to the technical field of satellite navigation, in particular to a method for optimizing constellation configuration of a low-orbit satellite augmentation system for ARAIM applications. Background technique [0002] The Global Navigation Satellite System (GNSS) has developed rapidly and has been widely used in various fields. In the future, global public users will put forward a series of requirements for high precision, fast convergence, high integrity, high security, and high availability. Therefore, high security real-time precise positioning in complex environments has become a higher goal of current GNSS. In order to solve the above problems, all countries are actively building their own navigation augmentation systems, while the traditional navigation augmentation systems are the working system of ground station auxiliary information enhancement. However, due to my country's territorial and territorial constraints, it is di...

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Problems solved by technology

[0005] At present, the research on low-orbit navigation enhancement mainly focuses on real-time precise orbit determination and remote sensing monitoring. There is a lack of integrity monitoring in the low-orbit satellite navigation enhancement system. Once the low-orbit satellite navigation system is officially used for navigation enhancement services, it will affect ARAIM. Availability of onboard receivers

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