A H-ARAIM system for optimizing lateral protection level

Abstract

The invention provides an H-ARAIM system for optimizing lateral protection level. The system comprising a constellation, a ground reference station and the flight vehicle. The ground reference stationreceives and processes the coordinate data from the satellites of the constellation and prepares input data for calculating the protection level of the flight vehicle. The flight vehicle is providedwith a receiver and a data processor. The receiver takes the input data from the ground reference station and transmits the data to the data processor, which processes the data in the following way. When the difference between the positioning solution of the fully visible satellite and the positioning solution of the fault subset is below the threshold level according to the fault subset statistical tests, the receiver starts to calculate the protection level and the calculation for protection level undergoes iterative update. The protection level obtained by the invention is optimized by 8.6%compared to the averaged dichotomy, and the applicability is equivalent to that of objective function method.

Description

technical field [0001] The invention relates to the field of aerospace technology, in particular to an H-ARAIM system with optimized level protection level. Background technique [0002] Advanced Receiver Autonomous Integrity Monitor (Advanced Receiver Autonomous Integrity Monitor, ARAIM) is an important technology in the satellite navigation augmentation system. As a typical airborne integrity monitoring technology, ARAIM utilizes redundant measurements to quickly detect and eliminate satellite faults, and issue warnings to users in a timely manner. [0003] ARAIM allows the measurement signal from the satellite to be available σ URA,i , σ URE,i and b nom,i described deviation, but if the signal deviation is outside the described range, then the satellite is considered to be malfunctioning. The receiver according to the P in the ISM information sat,i and P const,j to determine which failure modes need to be monitored. Each failure mode corresponds to a subset of sate...

AI Technical Summary

Problems solved by technology

[0004] At present, with the development of global GNSS towards multi-constellation, the multi-constellation H-ARAIM still has the following problems: First, the classification of fault subsets is unreasonable. The existing ARAIM fault detection model is based on The calculation load has also increased exponentially, making the availability prediction of H-ARAIM unable to quickly obtain results; second, the protection level estimation accuracy is low and the calculation speed is slow. In the calculation of ARAIM's existing protection level and other quality indicators, risks are Evenly distributed to each fault subset, the protection level index obtained is not the optimal solution, and it is difficult to better support the development requirements of H-ARAIM and related aviation applications

The commonly used protection level calculation methods today are the average dichotomy method in engineering and the theoretical objective function method. However, the former is too rough to reflect the reasonable distribution of risks, and the latter is too complicated to be conducive to engineering applications.

On the other hand, the risk treatment in the existing protection and calculation methods is not suitable for the fault detection model of the orbit selection method. For the solution separation detection of the constellation layer subset solution, the continuity risk should be reasonably allocated first, and then the When finally calculating the protection level, attention should also be paid to the optimal allocation of integrity risks

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