Ground systems: maximize science downlink to reduce costs

Jonathan Gal-Edd; Curtis Fatig; Jane Steck; Robert Zepp

doi:10.1117/12.472712

2 January 2002 Ground systems: maximize science downlink to reduce costs

Jonathan Gal-Edd, Curtis Fatig, Jane Steck, Robert Zepp

Proceedings Volume 4844, Observatory Operations to Optimize Scientific Return III; (2002) https://doi.org/10.1117/12.472712
Event: Astronomical Telescopes and Instrumentation, 2002, Waikoloa, Hawai'i, United States

Abstract

Selections and tradeoffs during mission concept development and ground system architecture definition determine the cost-effectiveness of the spacecraft operations. The Next Generation Space Telescope (NGST) makes this difficult due to its unique mission requirements. Experience has shown a greater savings can be achieved at the ground station and it's interfaces with the spacecraft. Since a majority of the bandwidth is used for science data, this is one of the major areas to explore. This paper will address problems and experiences with the various approaches to accommodate the ground station interfaces with the spacecraft. As a team we have explored several approaches: - Antenna size, frequency, and transmit power on the spacecraft is a big driver in determining the ground station cost, - Data guarantee verses data loss risk, - Down-linking all data verses putting more logic for science processing on board. This includes discussions on guaranteed data delivery protocols and downlink change only data, - Evaluation of recording the data at the ground station for a reduced rate playback later, and - Transmitters at different frequencies for simultaneous downlinks. Many of these topics and how they are applied, change over the course of time as projects implement their requirements. To achieve the goal of 'low cost', innovated approaches have to be taken into consideration.

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Jonathan Gal-Edd, Curtis Fatig, Jane Steck, and Robert Zepp "Ground systems: maximize science downlink to reduce costs", Proc. SPIE 4844, Observatory Operations to Optimize Scientific Return III, (2 January 2002); https://doi.org/10.1117/12.472712

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KEYWORDS

Space operations

Antennas

Ka band

Space telescopes

Data centers

Computer programming

Transmitters

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