Name

CL_gm_lat2locTime — Local time at given latitude for a sun synchronous orbit

Calling Sequence

   [loctime_asc,loctime_desc]=CL_gm_lat2locTime(lat,inc_sso,loctime_asc_node)
   
   

Description

  • This function computes for a given heliosynchronous inclination (inc_sso) and a given local time of ascending node (loctime_asc_node), the satellite's local time for ascending arc (loctime_asc) and descending arc (loctime_desc) at a given latitude (lat).

    Notes :

    - this function assumes a spherical planet

    - latitude must be inferior to the satellite's inclination (or %pi-inclination if inclination is greater than %pi/2)

  • Last update : 2/09/2008

Parameters

lat:

latitude [rad] (1xN)

inc_sso:

heliosynchronous inclination [rad] (1xN)

loctime_asc_node:

local hour of ascending node [hours] (1xN)

loctime_asc:

local hour of satellite [hours] (1xN)

loctime_desc:

local hour of satellite [hours] (1xN)

Authors

CNES - DCT/SB

Bibliography

Satellites orbites et missions - Michel Capderou

Examples

inc_sso = CL_deg2rad(98.6);
lat = CL_deg2rad(-90+9:1:90-9);
loctime_asc_node=22;
[loctime_asc,loctime_desc]=CL_gm_lat2locTime(lat,inc_sso,loctime_asc_node);
scf();
plot(loctime_asc,lat*%CL_rad2deg,".r",loctime_desc,lat*%CL_rad2deg,".b")