Attachment NASA Coordination

This document pretains to SES-STA-20190517-00638 for Special Temporal Authority on a Satellite Earth Station filing.

IBFS_SESSTA2019051700638_1685819

                                           Exhibit For
                                   Lockheed Martin Corporation
                                    Carpentersville, New Jersey
                                   TIW 14.2 Meter Earth Station
                                         Call Sign E7541

     Compliance with FCC Report & Order (FCC96-377) for the 13.75 - 14.0 GHz Band
                              Analysis and Calculations

1.       Background

This Exhibit is presented to demonstrate the extent to which the Lockheed Martin Corporation
satellite earth station, which is operated in Carpentersville, New Jersey, is in compliance with
FCC REPORT & ORDER 96-377. The potential interference from the earth station to US Navy
shipboard radiolocation operations (RADAR) and the NASA space research activities in the
13.75 - 14.0 GHz Band is addressed in this exhibit. The parameters for the earth station are:

                          Table 1. Earth Station Characteristics

     •   Coordinates (NAD83):                     40°38’ 39.1” N, 75° 11’ 27.8” W

     •   Satellite Location for Earth Station:     129° W (SES-15)

     •   Frequency Band:                           13.75-14.0 GHz for uplink

     •   Polarizations:                            Circular and Linear

     •   Emissions:                                1M00F2D
                                                   400KFXD

     •   Modulation:                               Digital

     •   Maximum Aggregate Uplink EIRP:            83.0 dBW for the 1 MHz Carriers
                                                   83.0 dBW for the 400 kHz Carriers

     •   Transmit Antenna Characteristics
            Antenna Size:                          14.2 meters in Diameter
            Antenna Type/Model:                    TIW Systems
            Gain:                                  63.5 dBi

     •   RF power into Antenna Flange:             1 MHz
                                                   19.1 dBW
                                                   or -4.9 dBW/4 kHz (Maximum)


                                                 400 kHz
                                                 19.1 dBW
                                                 or -0.9 dBW/4 kHz (Maximum)

     •   Minimum Elevation Angles:
         Carpentersville, NJ.                    18.4° @ 244.5° Az. (SES-15) at 129.0° W

     •   Side Lobe Antenna Gain:                 32 - 25*log(θ)


Because the above uplink spectrum is shared with the Federal Government, coordination in this
band requires resolution data pertaining to potential interference between the earth station and
both Navy Department and NASA systems. Potential interference from the earth station could
impact with the Navy and/or NASA systems in two areas. These areas are noted in FCC Report
and Order 96-377 dated September 1996, and consist of (1) Radiolocation and radio navigation,
(2) Data Relay Satellites.

Summary of Coordination Issues:

1) Potential Impact to Government Radiolocation (Shipboard Radar)
2) Potential Impact to NASA Data Relay Satellite Systems (TDRSS)


2.       Potential Impact to Government Radiolocation (Shipboard Radar)

Radiolocation operations (RADAR) may occur anywhere in the 13.4 - 14 GHz frequency band
aboard ocean going United States Navy ships. The Federal Communication Commission (FCC)
order 96-377 allocates the top 250 MHz of this 600 MHz band to the Fixed Satellite Service
(FSS) on a co-primary basis with the radiolocation operations and provides for an interference
protection level of -167 dBW/m2/4 kHz.

The closest distance to the shoreline from the Carpentersville earth station is approximately 82.0
km Southeast toward the Atlantic Ocean. The calculation of the power spectral density at this
distance is given by:
                                               1 MHz                       400 kHz

         1. Clear Sky EIRP:                  83.0 dBW                    83.0 dBW
         2. Carrier Bandwidth:                1 MHz                      400.0 kHz
         3. PD at antenna input:               -4.9                        -0.9
               dBW/4 kHz
         4. Transmit Antenna Gain:                          63.9 dBi
         5. Antenna Gain Horizon:                     FCC Reference Pattern
         6. Antenna Elevation Angles:                   18.4°


The proposed earth station will radiate interference toward the Chesapeake Bay according to its
off-axis side-lobe performance. A conservative analysis, using FCC standard reference pattern,
results in off-axis antenna gains of -10.0 dBi towards the Atlantic Ocean.

The signal density at the shoreline, through free space is:

1MHz Carriers
PFD = Antenna Feed Power density (dBW/4 kHz) + Antenna Off-Axis Gain (dBi) – Spread Loss
(dBw-m2).

       = -4.9 dBw/4 kHz + (-10.0) dBi – 10*log[4Π*(82000m)2]
       = -124.1 dBW/m2/4 kHz + Additional Path Losses (~64 dB)
       = -188.1 dBW/m2/4 kHz


400 kHz Carriers
PFD = Antenna Feed Power density (dBW/4 kHz) + Antenna Off-Axis Gain (dBi) – Spread Loss
(dBw-m2).

       = -0.9 dBw/4 kHz + (-10.0) dBi – 10*log[4Π*(82000m)2]
       = -120.1 dBW/m2/4 kHz + Additional Path Losses (~64 dB)
       = -184.1 dBW/m2/4 kHz

Our calculations show additional path loss of approximately 64 dB including absorption loss and
earth diffraction loss for the actual path profiles from the proposed earth station to the nearest
shoreline.

The calculated PFD including additional path losses to the closest shoreline location is –184.1
dBW/m2/4 kHz. This is 17.1 dB below the –167 dBW/m2/4 kHz interference criteria of R&O
96-377. Therefore, there should be no interference to the US Navy RADAR from the
Carpentersville earth station due to the distance and the terrain blockage between the site and the
shore.


3.     Potential Impact to NASA’s Data Relay Satellite System (TDRSS)

The geographic location of the Lockheed Martin earth station in Carpenterville, New Jersey is
outside the 390 km radius coordination contour surrounding NASA’s White Sands, New Mexico
ground station complex. Therefore, the TDRSS space-to-earth link will not be impacted by the
Lockheed Martin earth station in Carpentersville, New Jersey.


The TDRSS space-to-space link in the 13.772 to 13.778 GHz band is assumed to be protected if
an earth station produces an EIRP less than 71 dBW/6 MHz in this band. The 14.2 meter earth
station antenna will have an EIRP greater than 71 dBW/6 MHz for both the 1 MHz and 400 kHz
carriers in this band. Therefore, the Carpentersville, New Jersey earth station may not be tuned
to operate on frequencies in the 13.772 to 13.778 GHz band.



4.   Coordination Issue Result Summary and Conclusions

The results of the analysis and calculations performed in this exhibit indicate that compatible
operations between the earth station at the Carpentersville facility and the US Navy and NASA
systems space-to-earth link. The Carpentersville facility will not transmit in the NASA systems
space-to-space link (13772.0 to 13778.0 MHz) therefore avoiding conflict with this system.



Document Created: 2017-03-31 16:16:55
Document Modified: 2017-03-31 16:16:55

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