Fundamental Technologies Galileo Spacecraft Pages

Galileo EPD Command Density at Satellite Encounter

Source: R. C. Moore, March 6, 1979

Ed Nipper, the JPL EEIS uplink coordinator, has requested that the EPD command density be estimated for satellite encounter situations.  The primary concerns are:

1. How many different ground data command types are liable to be used at encounter, and
2. How frequently will ground data commands have to be sent to the EPD at encounter.

Because much of the EPD operation is controlled by the internal microprocessors, the command density should be very low at all times, even at satellite encounters. We estimate that our maximum rate for ground data commands shall not exceed one data command per minute.

The following list shows the various data commands which might be sent during satellite encounter:

The EPD requires no periodic data commands.

Next: Servicing the Galileo EPD Rate Channel Accumulators

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Updated 12/10/04, T. Hunt-Ward
tizby@ftecs.com