User’s Manual Hellas-Sat 2 Satellite USER’s MANUAL September 2005 1
User’s Manual INTRODUCTION The HELLAS SAT User’sl Manual gives a short description of the Hellas- Sat 2 satellite system and sets the procedures and calculations required for the user in order to access the satellite. It is offered to the service providers and potential users of the system with the aim to provide all necessary information for their systems planning and implementation of satellite services.
User’s Manual 1. SATELLITE TECHNICAL CHARACTERISTICS 1.1 INTRODUCTION This Section contains general information on the multi-region geostationary Hellas-Sat 2 satellite. 1.2 GENERAL CHARACTERISTICS The Hellas- Sat 2 satellite is designed for a minimum operational lifetime of 15 years and its orbital position can be controlled with ±0.09º East/West and ± 0.05º North/South accuracy over at least 12 years.
User’s Manual It is noted that, due to switching capabilities, channels 13-24(F1 antenna) or channels 37-48 (S2 antenna) may be downlinked in the band 12.50 to 12.75 GHz via the F1 antenna, selectable on a channel by channel basis. It is also possible to downlink S2 channels of the 14.25-14.50 GHz band via the F2 antenna in the 11.45-11.70 GHz band but in this case the F2 channels have to be downlinked via the S2 antenna in the 10.95-11.20 GHz band.
User’s Manual Figure 1.
User’s Manual 1.4 COVERAGE MAPS Hellas–Sat 2 satellite provides four antennas for reception. The fixed coverage F1 and F2 antennas differ only in the shaping of the main reflectors. In practice they provide almost the same coverage over Europe, N.Africa and Middle East. Annex C provides the receive coverage areas in terms of G/T contours for F1, F2, S1 and S2. The steerable antennas S1 and S2 are currently pointed to cover S.Africa and M.East/Eastern Europe region respectively.
User’s Manual In Table 1 below, the SFD values are presented for the above mentioned gain settings and for each particular satellite antenna. The quoted figures, based on the less sensitive transponder at nominal configuration, represent average values for all transponders. This means that a difference of 1 or 2 dB from the specified values is expected. Moreover, the peak gain values correspond to the minimum available values.
User’s Manual 1.7 TWTA TRANSFER CHARACTERISTICS All TWTA which are employed on Hellas- Sat 2 transponders provide a maximum output power of 105W. The OBO denotes the power level available at the output of the TWTA relative to that when the transponder is saturated. The OBO is therefore very important for link budget calculations as it provides the available power per carrier for one or more carriers in the down link.
User’s Manual 2. LEASED TRANSPONDER UTILIZATION CONDITIONS The lessee is free to set his own transmission parameters (type of carrier, bandwidth, modulation, quality etc), provided that this does not lead to unacceptable levels of interference of any kind into the same or on adjacent satellites. HELLAS SAT does not allow Power Limited links unless agreed otherwise between the two parties.
User’s Manual ANNEX A HELLAS SAT NETWORK OPERATIONS CONTROL Satellite Access Procedures Purpose : This document defines the procedures all Earth Stations must follow in order to access Hellas Sat 2 Space Segment. Customer Access : In order to transmit to Hellas Sat 2 satellite, an authorization procedure should firstly take place. Customers should originally contact Hellas Sat planning department (planning@hellassat.net).
User’s Manual ANNEX B LINK BUDGET EXAMPLE Example: Link between Athens and London on beam F2 transponder 03, multicarrier operation. Transponder is set on FGM 09. Picture 2 shows a snapshot from Satmaster indicating the required fields needed from the satellite operator. G/T and EIRP can be extracted from the coverages provided in Annex C G/TAthens=6.
User’s Manual ANNEX C COVERAGE MAPS F1 Vertical Transmit 12,647 MHz EIRP Pattern SATSOFT 10.00 46 44 50 8.00 48 52 48 44 Theta*sin(phi) in Degrees 53.94 50 46 44 6.00 52 52 48 50 44 46 46 50 48 44 4.00 2.00 -8.00 -7.00 -6.00 -5.00 -4.00 -3.00 -2.00 Theta*cos(phi) in Degrees -1.00 0.00 1.00 2.00 3.00 4.00 F1 Horizontal Receive 13,768 MHz G/T Pattern SATSOFT 10.00 0 8.00 2 4 Theta*sin(phi) in Degrees 6 6.00 6 2 4 6 8.37 0 4 8 0 2 4.00 2.00 -8.00 -6.00 -4.
User’s Manual SATSOFT F2 Vertical Transmit 11,135 MHz EIRP Pattern 10.00 48 8.00 52 50 54.30 48 52 52 6.00 48 52 50 48 50 4.00 2.00 -8.00 -6.00 -4.00 -2.00 Theta*cos(phi) in Degrees 0.00 2.00 4.00 SATSOFT F2 Horizontal Receive 14,021 MHz G/T Pattern 10.00 8.00 2 8 4 6 8 2 Theta*sin(phi) in Degrees Theta*sin(phi) in Degrees 50 6 8 6 4 11.10 6.00 4 8 6 10 8 2 2 4.00 2.00 -8.00 -6.00 -4.00 -2.00 Theta*cos(phi) in Degrees 13 0.00 2.00 4.
User’s Manual S1 Horizontal Transmit 12,729 MHz EIRP Pattern SAT SOF T 0.00 -1.00 44 46 48 50 -2.00 50 52.16 -3.00 52 44 48 46 48 Theta*sin(phi) in Degrees 44 46 50 -4.00 -5.00 50 48 -6.00 46 44 -7.00 -8.00 -9.00 -8.00 -6.00 -4.00 -2.00 Theta*cos(phi) in Degrees 0.00 2.00 4.00 S1 Vertical Receive 13,768 MHz G/T Pattern SATSOFT 0.00 -2 0 2 -2.00 4 4 0 -2 10° 4 2 2 Theta*sin(phi) in Degrees -2 0 4 -4.00 5.94 4 2 -6.00 0 -2 5° 10° 10° -8.00 5° -8.00 -6.00 -4.
User’s Manual -6 SAT SOF T S2 Vertical Receive 14,476 MHz G/T Pattern 8.00 -2 0 2 -4 4 -6 7.00 -8 5.65 0 -10 -2 2 6.00 -12 -4 2 -2 -14 4 4 0 4 5.00 -6 -10 -8 Theta*sin(phi) in Degrees -8 -12 4.00 -4 -14 -6 2 0 -2 -8 3.00 -4 -10 -2 -12 -6 2.00 -14 -8 -10 1.00 -12 -14 0.00 -1.00 -6.00 -4.00 -2.00 0.00 Theta*cos(phi) in Degrees 15 2.00 4.00 6.
