Sensor view angle for an overlap ratio of 1 at equator
[view_angle]=CL_gm_equatorialSwath(alt,inc,[er,rotr_pla])
Computes the view angle as seen from the satellite (angle from the descending vertical) so that the overlap ratio at equator is 1.
The overlap ratio is the ratio Q=Leq/Ded where:
- Leq: portion of the equator seen by the sensor during the time it crosses the equator.
- Deq: gap between 2 consecutive ground tracks at equator.
Notes:
- The planet is assumed spherical, and the orbit circular.
- The sensor is conic and oriented towards the descending vertical.
- The gap between 2 consecutive ground tracks is computed taking the effect of J2 into account.
- The result is undefined (%nan) if inclination is 0 or %pi.
Satellite's altitude [m] (1xN)
Orbit's inclination [rad] (1xN)
Sensor half view angle [rad] (1xN)
(optional) Equatorial radius [m] (default is %CL_eqRad)
(optional) Mean apparent rotation rate of the Sun around the planet (default is %CL_rotrEarthSun)
CNES - DCT/SB
1) Satellites orbites et missions - Michel Capderou