Maximum Descent Angle Design Method for RF segment to ILS Precision Approach

Abstract

The combination of the radius to fix(RF)segment of the required navigation performance(RNP)procedure and traditional instrument landing system(ILS)precision approach procedure can make full use of the advantages of the two types of procedures,but the transition phase of the two procedures needs to consider the design of the maximum descent angle. The plane and section geometric design parameter limitations of the transition phase procedure,and the operating limitations of the transition from satellite-based navigation to ground-based radio navigation that require stable interception of heading signals and glide slope signals are analyzed in this paper. Combining two types of limitations,a method that can calculate the relationship between the deviation of the glide path and the arc distance to the final approach course fix point(FACF)from different final approach point(FAP)heights is designed to determine the maximum descent angle,and the method is performed with simulation verification. The results show that the proposed method can calculate the maximum descent angle that meets the two types of limitations under the different transitional flight lengths and different final approach descent angles,and according to the given maximum program hypothetical temperature. This method provides a theoretical basis and feasible design method for the descending profile design of the transition between the RNP procedure and the ILS procedure.

Keywords

• flight procedure design
• required navigation performance
• instrument landing system
• rf turning segment
• operation limitation
• maximum descent angle