Satellite Information

0034-EX-ML-2013 Text Documents

The MITRE Corporation

2013-02-22ELS_133741

$APPENDIX B TECHNICAL APPENDIX Satellite Information Satellite: G-25 Orbital Location: 93.1° West Longitude Uplink Beam/Band: NAKH / Ku-Band Downlink Beam/Band: NAKV / Ku-Band Nominal Transponder Bandwidth: 27.0 MHz Customer Transponder Capacity Allocation: 7.2 MHz 1.0 INTRODUCTION This Technical Appendix contains the Performance Specifications for the Ku-Band transponders assigned to the Intelsat G-25 NAKH Uplink beam - NAKV Downlink beam. As described further herein the specifications are applicable to a fractional transponder allocation on a 27 MHz transponder and associated spares as noted, if available. 2.0 SATELLITE PERFORMANCE CHARACTERISTICS Longitude Tolerance: ± 0.05 degrees Orbital Tolerances: Inclination Tolerance: ± 0.05 degrees 2.1 Communication Antenna Pointing. The Satellite will maintain the orientation of its communications antenna relative to the earth such that the EIRP, G/T and SFD described in Section 3.1 are maintained. 3.0 COMMUNICATION SYSTEM PERFORMANCE CHARACTERISTICS 3.1 EIRP, G/T and SFD within Beam Coverage Area. Figure B-1 provides EIRP contours for the Satellite Downlink Beam, while Figure B-2 provides G/T contours for the Satellite Uplink Beam. These contours permit the user to estimate EIRP and G/T for any location within the Beam Coverage Areas. Minimum beam reference EIRP for the Transponder is 40.3 dBW ±1.0 dB, minimum beam reference G/T for the transponder is -4.2 dB/K ±1.5 dB. The SFD (at beam reference contour) ranges from -96 dBW/m² to -75 dBW/m² ±1.0 dB. Note: Beam Reference Contour values are based on the representative beam patterns attached. The contours are provided for estimation purposes only. It is recommended that a 1 dB margin be included when utilizing the contours. Appendix B G-25 NAKH / NAKV Beam Technical Appendix B-1$

3.1.1 Input Attenuators. The gain of each transponder is adjustable by ground command over
a range of 0 to 21 steps in 1 dB increments per step.

3.1.2 Saturation. For the purposes of this Specification, saturation is defined as the point on
the single carrier power-out versus power-in transfer curve corresponding to the operating point
that provides the specified EIRP output power and simultaneously meets the required linearity.

3.1.3 SFD Gain Stability. The SFD shall not vary by more than ±1.2 dB over any 24 hour
period and ±1.7 dB over the life of the Satellite for the specified coverage area.
a) Including the gain variations of the transponder.
b) Excluding the use of ground commandable gain.
c) Excluding effects of spacecraft attitude errors.
d) Including antenna thermal distortion.

Figure B-1. G-25 Ku-Band NAKV Downlink Beam

41

40.8 39 .8
41 38 .8

43 .8 42.8
44.8 41.8
45.8
46.8
46.8

47.8

47 .8

47.8
38 .839 .8
41
40.8
42.8 41.8
44 .843.8
45 .8 42 .8 42.8
46.8 42 .8
43 .8 43 .8
42 .8
43 .8
EL =10° N AK V

EL =5 °

93.1° W
EL =0 °
7

EL =

(EIRP Contours: 48.8, 47.8, 46.8, 45.8, 44.8, 43.8, 42.8, 41.8, 40.8, 40.3, 39.8 dBW)

Appendix B
G-25 NAKH / NAKV Beam
Technical Appendix

B-2

$Figure B-2. G-25 Ku-Band NAKH Uplink Beam -5 .3 -6.3 -4.2-4 .3 -3 .3 -2 .3 -1 .3 -0.3 +0.7 +1.7 +1.7 +1.7 -4 -4.2 .3 +1.7 -2 .3 -3.3 -1 .3 -0.3 -6 .3 +0.7 -5 .3 -0+0.7 .3 -4.2 -3 .3 +1.7 -2.3 N AK H EL =10° EL =5° EL =0° 93 .1 ° W 7 (G/T Contours: +2.7, 1.7, 0.7, -0.3, -1.3, -2.3, -3.3, -4.2, -4.3, -5.3 dB/K) 3.1.4 Two Carriers and Multi-carrier Operation. The values provided in Sections 3.1 are based on the occupancy of the transponder by a single carrier. The bandwidth and power specifications for a fractional transponder segment are contained in Table 1. While subject to final approval by Intelsat and based on specific transponder configuration, dual-carrier operation (2 carriers), or multi-carrier operation (3 or more carriers) must be conducted with a composite output and input backoff meeting the following specifications: Mode Output Input (see Note below) Multi Carrier: 3.8 dB/composite 9.0 dB/composite Note: For operation of carrier modulation other than QPSK, additional power constraints may be imposed in order to reduce the generation of intermodulation and other spurious signals. Appendix B G-25 NAKH / NAKV Beam Technical Appendix B-3$

Table 1. Fractional Transponder Allocation Specifications
Galaxy 25 Ku-Band NAKV Downlink Beam (Ku-Band NAKH Uplink Beam)

Transponder Bandwidth: 27.0 MHz

Allocated Bandwidth: 7.2 MHz

Transponder Composite Output Backoff: 3.8 dB

Additional Output Backoff: 5.7 dB (based on leased BW)

Total Output Backoff: 9.5 dB [1, 2]

Beam Reference Contour EIRP 40.3 dBW

Maximum Available EIRP (Beam Reference Contour) 30.8 dBW

Prior to carrier activation, Customer must provide Intelsat with a transmission plan detailing the
proposed carrier frequency, modulation and coding type, as well as required yearly service
availability level, along with other pertinent technical information, for approval by Intelsat. The
approval will consist of the specific carrier operational parameters. Intelsat reserves the right to
adjust the composite input backoff to achieve the specified output backoff.

Notes:
1. Specified full transponder EIRP values in Section 3.1 must be adjusted by the value shown.
2. Output backoff is the controlling value. Input backoff must be adjusted to meet output backoff requirements.
3. Prior to carrier activation, additional transponder parameters for designated space segment (i.e., frequencies, SFD) will
be provided.

3.1.5 EIRP Change Due to Redundant Power Amplifier. When any transponder is switched
from its primary HPA to an adjacent HPA, the transponder output power shall not decrease by
more than 0.5 dB relative to the EIRP using the primary power amplifier.

3.1.6 Gain Change Due to First Redundant Receiver. When the first receiver is substituted for a
redundant receiver, the gain of the affected transponders shall not decrease by more than 0.5 dB.

Appendix B
G-25 NAKH / NAKV Beam
Technical Appendix

B-4

3.2 SATELLITE COMMUNICATION SYSTEM EXPECTED PERFORMANCE

3.2.1 Co-Channel Interference. The Total Co-Channel Interference ratio due to interference
from co-frequency carriers on the satellite is expected to be a minimum of 30 dB for most
locations within the Beam Reference Contour.

3.2.2 Nominal Channel Frequencies and Polarization. Each Transponder in the Beam Coverage
Area shall use the Uplink and Downlink frequency range provided in Table 2 below. Moreover,
the Beam Coverage Area shall be accessible by either linear vertical or horizontal polarization.
Intelsat reserves the right to assign and/or reassign Customer’s space segment allocation within
the Transponder or to other Transponders or Satellites within the applicable Uplink and/or
Downlink Beam Coverage Area. Except in emergency circumstances, Intelsat shall notify
Customer of any changes to its initial allocation as soon as reasonably practicable prior to such
change and shall use reasonable efforts to minimize disruption to Customer’s Transponder
Capacity during any such change.

3.2.3 Frequency Translation. The communication system translates Uplink transmissions by a
net frequency subtraction identified in Table 2 below. The net translation error is not expected to
exceed ±1.5 ppm over the operating lifetime of the satellite, with variations over any 30 day
period not to exceed ±0.2 ppm.

Table 2. Frequency Range and Corresponding Translation Frequency

Uplink Band Downlink Band Translation Frequency
from 14.00 to 14.50 GHz from 11.70 to 12.20 GHz 2300 MHz

End of Appendix B.

Appendix B
G-25 NAKH / NAKV Beam
Technical Appendix

B-5

Document Created: 2013-02-22 09:03:35
Document Modified: 2013-02-22 09:03:35