Longitudes of repeating ground tracks
res = CL_op_repeatGroundTracks(N, P, Q [[, option]])
Computes the longitudes of the ground tracks (at a reference latitude) of a repeat orbit.
res contains :
- first column : res(:,1) : orbit number
- second column : res(:,2) : number of orbital days in the cycle
- third column : res(:,3) : longitude gap between first ground track and current ground track (rad)
- fourth column : res(:,4) : longitude gap between first ground track and current ground track expressed in reference longitude gaps, where reference longitude gap = 2*pi/(N*Q+P)
option is such that :
- option = 0 : res contains all longitudes in [0; 2*pi[
- option = 1 : res contains successive longitudes in [0; DL[, with DL longitude gap between two successive ground tracks
- option = 2 : res contains successive longitudes in [-DL/2; DL/2[ such that gap with initial longitude is decreasing
- option = 3 : res contains all longitudes in [-pi; pi[
Value of N (1x1)
Value of P (1x1)
Value of Q (1x1)
(optional) see description. Default is 1. (1x1)
see description (Mx4)
CNES - DCT/SB
// number of longitude reference gaps // versus number of orbital days : N = 15; P = 3; Q = 16; res = CL_op_repeatGroundTracks(N,P,Q); plot(res(:,2),res(:,4),'s'); // number of longitude reference gaps versus // number of orbital days (decreasing values) : res = CL_op_repeatGroundTracks(N,P,Q,option=2) // => sub-cycle corresponds to 76 orbits (~5 orbital days) | ![]() | ![]() |