OLSG Report_Final_06_05_12 - Interagency Operations Advisory ...

Optical Link Study Group (OLSG) Final Report
IOAG.T.OLSG.2012.V1
Table 19: Ground station costs for the L2 Scenario (k€).
L2 Scenario Ground Station Costs in k€
Tenerife
Hartebeesthoek
Total
Initial Station Investment Costs:
Terminal (telescope, dome, and electronics) 5,452 5,452
Site Facilities Investment Costs (Buildings, Power,
energy, etc.) 1,560 393
Wide Area Communication Investment Costs
(ground comm) 0 1242
Weather and Atmospheric monitoring 250 250
Aviation Safety System 350 350
Subtotal Initial Station Investment Costs 7,612 7,687 15,299
Recurring Operating Costs:
Site and Terminal Operating Costs 1,168 1,168
Communication Operating Costs 390 390
Subtotal Recurring Operating Costs 1,558 1,558 3,116
3.5.7 Business Case
Analysis of the L2 Scenario indicates that cross support would be beneficial 1) because of
the need to maximize contact time via geographical diversity so that continuity of data is
maintained, and 2) to enable use of meteorologically diverse ground stations.
3.6 L1 Scenario
The L1 case study used the orbit of the existing Solar and Heliospheric Observatory (SOHO)
mission, along with the operations concept inspired by Euclid’s “burst-mode” downlink
model (again, this concept resembles what is deemed well adapted for optical downlink of
science data).
In contrast to L2, communications to L1 imply daytime operations, inferring cloudier
conditions than at night. In addition, the angular separation of the LOS from the Sun (SEP
angle) must also be considered (by signal-to-noise ratio [SNR] considerations in the link
budget).
3.6.1 Concept of Operations
3.6.1.1 Basic ConOps
The same underlying assumptions were made as in the L2 Scenario – see section 3.5.1.1
3.6.1.2 Scenario ConOps
The same methodologies were applied as in the L2 Scenario – see section 3.5.1.2.
3.6.2 Space Terminal
The L1 space terminal will be very similar to that of the L2 Scenario (see section 3.5.2);
however, the SPE constraints do not apply. This factor is taken into account in the
associated link budget.
Page | 81