Package gov.nasa.jpl.lighttime

Interface LightTimeProvider

All Known Implementing Classes:

SPKLightTimeProvider

public interface LightTimeProvider

This interface provides a downleg and upleg duration given a time, the two objects, and which frame the duration should be expressed in. The idea is that information from SPICE itself, a 'light time file' for SEQGEN, or Monte can all be injected in and provide the values that underlie the time frame conversion functions.

Method Summary

Modifier and Type	Method	Description
Duration	downleg(Time t, int sc_id, int body_id, String time_reference)
Duration	upleg(Time t, int sc_id, int body_id, String time_reference)

Method Details

downleg

Duration downleg(Time t,
 int sc_id,
 int body_id,
 String time_reference)

Parameters:

t - The time at which the light time is desired

sc_id - The SPICE ID of the spacecraft

body_id - The SPICE ID where one wants the downleg to

time_reference - Either 'ETT', 'ERT', or 'SCET', depending on the desired frame

Returns:

The time it takes light to travel from the spacecraft to the body_id

upleg

Duration upleg(Time t,
 int sc_id,
 int body_id,
 String time_reference)

Parameters:

t - The time at which the light time is desired

sc_id - The SPICE ID of the spacecraft

body_id - The SPICE ID where one wants the downleg to

time_reference - Either 'ETT', 'ERT', or 'SCET', depending on the desired frame

Returns:

The time it takes light to travel from the body_id to the spacecraft