rfgfs: Flight planner and companion package for FlightGear

Description Usage Arguments Value

This function calculates the current NVU orthodromic coordinates (Z and S) based on radial and distance from a VOR/DME beacon.

1 2	corrNVU_VOR(plan, leg, VOR, radialTo, dist, S = NA, cols = c("fix", "fixLat", "fixLon", "ZPY"))

`plan`	A flight plan, as a data.frame. Plans created with `planNVU(..., merge=TRUE)` are accepted as input. At a minimum, the data frame.should have four columns: waypoint names, latitudes, longitudes and ZPY (NVU course). The latter is needed to indirectly identify the NVU legs, which may not correspond 1:1 to the legs of the flight plan (see `points=` in `planNVU`).
`leg`	The current leg of the flight plan, whose NVU parameters are to be corrected. It is specified either as a number or as the initial fix.
`VOR`	ID of the VOR to use.If multiple stations match, the correct one is determined based on proximity to the initial fix of the leg.
`radialTo`	Current inbound radial (as indicated on the UShDB instrument of the Tu-154).
`dist`	Distance in km, as measured by the DME
`S`	Along track distance S, as currently indicated in the NVU computer. If supplied, it must always be negative (as is the NVU convention).
`cols`	An optional vector of column names, if these are named differently in `plan`

Returns the current orthodromic coordinates Z (cross track error) and S (along track distance) as a named vector.These can be fed into the NVU computer to correct the course of the aircraft.

Because S is changing rapidly as the aircraft travels, for convenience if S is supplied as an argument, an extra element dS is added to the return vector indicating the difference between actual (corrected) S minus indicated S. Add dS to the current S indication of the NVU to correct it.

thlytras/rfgfs documentation built on May 31, 2019, 10:44 a.m.