GBAS Integrity Performance Evaluation Based on the Mixed g-and-h Distribution

The evaluation of Ground Based Augmentation System (GBAS) integrity performance is critical to the safety of aviation users. However, such evaluation remain challenging due to low integrity risk requirements. This paper proposes an innovative GBAS integrity evaluation method under the fault-free (H-0) hypothesis with limited samples, which is based on the mixed g-and-h distribution. The mixed g-and-h distribution can well characterize the actual distribution of the normalized error and make full use of sample information to evaluate integrity. Moreover, the credibility of the integrity evaluation result is obtained in this paper. Then, the vertical integrity performance of the GBAS at Dongying Shengli Airport in China is evaluated. The results show that the vertical Misleading Information (MI) probability is less than 2.23x10(-9)/150 s and the integrity meets the requirement of GAST-C at a confidence level of at least 99%.