CL_gm_equatorialSwath

Description

• This function is deprecated.

  Replacement function: CL_op_equatorialSwath

• 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.

Parameters

alt:

Satellite's altitude [m] (1xN)

inc:

Orbit's inclination [rad] (1xN)

view_angle:

Sensor half view angle [rad] (1xN)

er:

(optional) Equatorial radius [m] (default is %CL_eqRad)

rotr_pla :

(optional) Rotation rate of the planet (default is %CL_rotrBody)

Authors

• CNES - DCT/SB

Bibliography

• 1) Satellites orbites et missions - Michel Capderou

See also

• CL_gm_equatorialOverlap

Examples

alt = [822.e3 630.e3] ; inc = [CL_deg2rad(98.72) CL_deg2rad(96.72)]; [view_angle] = CL_gm_equatorialSwath(alt,inc)