Research on FMC analytic algorithm of PBN track transition coding

doi:10.23919/JSEE.2023.000090

Abstract

Abstract:

Airborne navigation database (NavDB) coding directly affects the result of analysis on the instrument flight procedure by the modern aircraft flight management computer (FMC). A reasonable flight track transition mode can improve the track tracking accuracy and flight quality of the aircraft. According to the path terminator (PT) and track transition characteristics of the performance based navigation (PBN) instrument flight procedure and by use of the world geodetic system (WGS)-84 ellipsoidal coordinate system, the algorithms for “fly by” and “fly over” track transition connections are developed, together with the algorithms for coordinates of fix-to-altitude (FA) altitude termination point and heading-to-an-intercept (VI) track entry point and for track transition display of the navigation display (ND). According to the simulation carried out based on the PBN instrument approach procedure coding of a certain airport and the PBN route data at a high altitude, the algorithm results are consistent with the FMC-calculated results and the actual ND results.

Key words: flight management computer (FMC), performance based navigation (PBN), path terminator (PT), navigation database (NavDB) coding, track transition

Guangming ZHANG, Siqian REN, Weiwei ZHAO, Xiuyi LI. Research on FMC analytic algorithm of PBN track transition coding[J]. Journal of Systems Engineering and Electronics, 2023, 34(4): 1042-1052.

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Path type	Path termination way
I = Initial	A = Altitude
T = Track to	C = Distance
C = Course to	D = DME distance
D = Direct to	F = Fix
F = Fix to	I = Intercept
H = Holding	M = Manual
P = Procedure turn	R = Radial
A = Arc	A = Altitude
R = Constant radius arc	C = Distance
V = Heading to	D = DME distance

Type	Termination method	Typical leg	Characteristics
Point	Point termination	IF	IF represents the initial point of the procedure

Type	Termination method	Typical leg	Characteristics
Arc	Point termination	CF	CF represents a non-stop flight along the rhumb line to the waypoint ahead with the course and the waypoint ahead given by the NavDB
		DF	For DF, the track is determined according to the turning direction, the position of the waypoint ahead and the aircraft model data in the NavDB
		RF	For RF, the track is determined according to the three-dimensional positions of the starting fix and the termination fix and the aircraft model data in the NavDB

Type	Termination method	Typical leg	Characteristics
Arc	Intercept termination	VI	VI has no definite termination point and interception of the next leg is realized in a certain heading

Type	Termination method	Typical leg	Characteristics
Segment	Point termination	TF/CF/DF	The termination point location is given by the NavDB
Segment	Altitude termination	CA/FA/VA	The altitude of the termination point is determined but the location is not