HSAT Experiment Narrative

0016-EX-CN-2016 Text Documents

Harris Corporation

2016-08-22ELS_180998

                                   HSAT-1
Exhibit 1: Experiment Description Document for FCC
                                           Application
                            Stephen T. Gillespie, P.E.
                                       Harris Corporation



                                                Revision –

                                           05 August 2016




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                                                       TABLE OF CONTENTS




1.0     INTRODUCTION .............................................................................................................................. 3
2.0     TECHNICAL DETAILS ........................................................................................................................ 4

    2.1 PHYSICAL DESCRIPTION AND EXPERIMENT .................................................................................................. 4
    2.2 RADIO FREQUENCY SPECTRUM UTILIZED .................................................................................................... 5
       2.2.1  Requested Emitter Frequency Allocations .............................................................................. 6
    2.3 ANTENNA DETAILS ................................................................................................................................ 6
       2.3.1  Space Segment Emitting Antennas ......................................................................................... 6
       2.3.2  Space Segment Receive-Only Antennas .................................................................................. 8
       2.3.3  HSAT-1 Ground Terminal Antenna ........................................................................................ 12
    2.4 HARRIS “STOP BUZZER” CONTACT.......................................................................................................... 12



                                                             Table of Figures
Figure 2-1: HSAT-1 Physical Description                                                                                                                4
Figure 2-2: Globalstar GAT-17PP Tx Antenna Pattern                                                                                                     6
Figure 2-3: Globalstar GAT-17PP Rx Antenna Pattern                                                                                                     7
Figure 2-4: Globalstar GAT-17PP Antenna                                                                                                                7
Figure 2-5: S-band Patch Pattern                                                                                                                       8
Figure 2-6: AIS Monopole Antenna Directivity                                                                                                           9
Figure 2-7: BBDA Directivity, 159.0125 MHz                                                                                                            10
Figure 2-8: BBDA Directivity, 195 MHz                                                                                                                 10
Figure 2-9: BBDA Directivity, 397.5 MHz                                                                                                               11
Figure 2-10: BBDA Directivity, 1260 MHz                                                                                                               11
Figure 2-11: HSAT-1 Ground Terminal Antenna Normalized Gain                                                                                           12


                                                              Table of Tables
Table 2-1: HSAT-1 Technical Description ....................................................................................................... 4
Table 2-2: Radio Frequency Spectrum Summary for HSAT-1 ........................................................................ 13




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1.0       Introduction
Harris Corporation is requesting a 24 month experimental license from the Federal
Communication Commission’s (FCC) Office of Engineering and Technology (OET) in
order to complete the objectives of the HSAT-1 mission. The HSAT-1 cubesat is an
orbital experimental testbed being developed by Harris Corporation for launch in Q2
2017. The following objectives of the HSAT-1 orbital experiment will improve the radio
state-of-the-art:
      •       Assess the effectiveness of radiation mitigation techniques of the payload
                  in the actual environment with continual performance and event
                  monitoring
      •       Assess the performance of a broad-bandwidth deployable antenna (BBDA)
                  specifically designed for cubesats through on-orbit measurement
      •       Assess the effective coverage of Harris’ earth-to-space and space-to-earth
                  Tracking, Telemetry, and Control (TT&C) and payload experiment
                  data communications through on-orbit demonstration of an S-band
                  radio
In order to assess payload performance in a radiation environment, the HSAT-1 orbital
testbed must continually receive and process, which requires a signal-rich environment.
Initially, HSAT-1 will receive and process maritime Automatic Identification System (AIS)
signals using a TRL-9 commercially available cubesat antenna, hereafter referred to as
the “AIS monopole antenna”. TT&C and payload experiment data communications will
be performed during the first phase through the Globalstar constellation & network.
Approximately 60 days after launch, HSAT-1 will disable the AIS monopole antenna and
deploy a broad-bandwidth deployable antenna (hereafter referred to as the “BBDA”).
This begins the second phase of the payload experiment. The payload will receive VHF
broadcast signals in addition to AIS signals to determine the low band performance.
Solar noise will also be received to determine performance of the BBDA’s mid and upper
band. During this time, TT&C and payload experiment data communications through the
S-band radio to a Harris ground terminal will be demonstrated. Since the BBDA
receives in a much wider bandwidth, a higher data rate modem than the Globalstar is
required to transmit the payload experiment data to satisfactorily characterize the
performance of the antenna. The S-band radio meets this need with a higher data rate
downlink capability.
Specific frequency bands requested are listed in Section 2.2. Usage of the requested
RF spectrum for this flight experiment is critical to the success of the flight experiment.
The requested RF communications implementation provides both the ability to
successfully command the spacecraft and the ability to receive critical engineering
telemetry and experiment data. Harris Corporation is requesting a 24 month
experimental license from the Federal Communication Commission’s (FCC) Office of
Engineering and Technology (OET) in order to complete the objectives of the HSAT-1
mission.
Harris Corporation will be the sole owner and operator of the HSAT-1 satellite.



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2.0    Technical Details

2.1    Physical Description and Experiment
The HSAT-1 orbital testbed is a 6U cubesat with two deployable solar array panels and
two deployable antennas as depicted in Figure 2-1. Harris Corporation has signed a
Launch Services Agreement (LSA) with Spaceflight, Inc, to launch HSAT-1 on an Indian
Polar Satellite Launch Vehicle (PSLV) in March 2017 through the Indian Space
Research Organization (ISRO) at the SHAR (Sriharikota) Spaceport (Satish Dhawan
Space Center). The satellite will fly in a sun-synchronous orbit at 500 km altitude, 97.4°
inclination, and 9:30 AM Local Time Descending Node (LTDN). Table 2-1 details other
technical parameters of HSAT-1.




                       Figure 2-1: HSAT-1 Physical Description



                      Table 2-1: HSAT-1 Technical Description
                   Parameter                   Value / Description
                  Mission Life                  2 years minimum
                      Mass                          < 13.2 kg
                      Size                             6U
                   Propulsion                         None
                Attitude Control          Reaction wheels & torque rods
                    Batteries           Nine 2.8 amp-hour lithium ion cells
               Primary TT&C Link               Globalstar Network
              Redundant TT&C Link                 S-band Radio



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HSAT-1 will be launched in a powered off state within its dispenser. Upon orbital
insertion, HSAT-1 will be ejected from its dispenser and begin a power-on and boot
sequence followed by orientation into a sun-safe mode (solar panels oriented towards
sun). No radio communications will occur for a minimum of 30 minutes after ejection
from the launch dispenser. After the radio blackout period has ended, the satellite will
transmit state-of-health telemetry to Harris through the Globalstar constellation and
network using Globalstar’s GSP-1720 modem. Once the data has been reviewed,
Harris will command the satellite to deploy the AIS monopole antenna. This antenna is
manufactured by Innovative Solutions in Space and is fully qualified with flight history
(TRL-9). The AIS monopole antenna is fed to a Harris-manufactured AIS receiver,
which has qualification-by-similarity history. Once deployed, Harris will upload specific
mission decks that will command the payload to begin receiving and processing AIS
signals. For the following 2 months, telemetry will be recorded indicating specific
payload performance as well as any radiation-induced events. During this time the
telemetry and corresponding mission data will be communicated to the Harris Satellite
Operations Center (HSOC) through the Globalstar network.
After the primary payload objectives have been demonstrated (approximately 2 months
after launch), Harris will command the satellite to deploy the BBDA. Once deployed,
Harris will review the deployment telemetry and then switch the payload receiver from
the AIS monopole antenna to the BBDA. Payload processing will continue as before,
but now utilizing four separate bands over the BBDA range instead of one. This
presents the opportunity to continue to monitor payload performance and radiation
effects over mission life while utilizing several discrete regions across the BBDA to
evaluate specific antenna performance
Testing will conclude 24 months after launch, at which time the spacecraft will be
passivated and decommissioned. Deorbit will occur naturally through atmospheric drag.
Based on an analysis utilizing NASA’s DAS 2.0.2 software with specific HSAT-1 inputs
(mass, size, form, initial orbit, material types, etc), HSAT-1 is anticipated to remain in
orbit less than 4.3 years total. In addition, the HSAT-1 design passed all other
requirements of debris and deorbit in accordance with NPR 8715.6A, which addresses
breakups and other debris-producing events. Reference Exhibit 2 for the complete
Orbital Debris and Deorbit Assessment.



2.2    Radio Frequency Spectrum Utilized
Table 2-2 summarizes the requested radio frequency spectrum for the HSAT-1 satellite.
These bands were selected for various reasons:
               1) Reducing cost through high reuse and utilization of existing designs
                  (the hardware has been previously designed for these frequencies
                  and some long lead components were already available in inventory);
               2) Four separate bands spaced over the BBDA design band is
                  necessary for evaluating antenna performance;



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These bands already contain an abundance of continuous signals such as AIS and VHF
broadcasting which allow the payload to continually receive and process in order to
monitor and detect radiation events.

2.2.1 Requested Emitter Frequency Allocations
Harris Corporation specifically requests to utilize the following allocations for the HSAT-1
satellite system:
         Two emitters on the HSAT-1 mobile satellite
             o Globalstar: Space-to-space (1610-1626.5 MHz)
             o Downlink: Space-to-earth (2180-2185 MHz)
         One ground terminal owned by Harris Corporation
             o Uplink: Earth-to-space (2005-2006.25 MHz)
Harris Corporation requests the above specific frequency allocations to meet the current
ground terminal design capabilities, there is flexibility to modify the request to nearby
bands in case of coordination issues with other users.

2.3       Antenna Details

2.3.1 Space Segment Emitting Antennas

2.3.1.1 Globalstar Patch Antenna
HSAT-1 initial and primary TT&C and payload experiment communications link is
through the Globalstar GAT-17PP patch antenna in conjunction with the Globalstar
GSP-1720 modem aboard the satellite. The transmit element provides +4.5 dBic gain
within the operating frequency band of 1610-1626.5 MHz. The receive element provides
+0.2 dBic gain at 2483.5-2500.0 MHz. Figure 2-2 details the radiating pattern of the
patch antenna for transmit, and Figure 2-3 details the pattern for receive.




                 Figure 2-2: Globalstar GAT-17PP Tx Antenna Pattern

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               Figure 2-3: Globalstar GAT-17PP Rx Antenna Pattern




                    Figure 2-4: Globalstar GAT-17PP Antenna

2.3.1.2 S-band Passive Patch Antenna
HSAT-1 secondary TT&C and payload experiment communications link is through a
custom passive patch antenna in conjunction with a Tethers Unlimited S-band radio
aboard the satellite. This patch antenna will transmit signals containing TT&C and
payload experiment data to the Harris Ground Terminal at 2180-2185 MHz. Figure 2-5
details the radiating pattern of the antenna at the center of the requested band.




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                         Figure 2-5: S-band Patch Pattern



2.3.2 Space Segment Receive-Only Antennas

2.3.2.1 S-band Receive Patch Antenna
HSAT-1 will utilize a custom passive patch antenna in conjunction with a Tethers
Unlimited S-band radio aboard the satellite. This antenna is separate from the patch
antenna described in Section 2.3.1.2, and will receive TT&C signals from the Harris
Ground Terminal at 2005-2006.25 MHz. The patch antenna receive pattern is identical
to the radiating pattern depicted in Figure 2-5.

2.3.2.2 Payload AIS Monopole Antenna
HSAT-1 will utilize a deployable monopole whip antenna manufactured by Innovative
Solutions in Space to receive AIS signals as part of the payload experiment. The
antenna will receive AIS signals between 159.0125-161.025 MHz. Figure 2-6 details the
pattern of the antenna at 159.0125 MHz.




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                   Figure 2-6: AIS Monopole Antenna Directivity

2.3.2.3 Payload Broad Bandwidth Deployable Antenna (BBDA)
HSAT-1 will utilize a custom broad bandwidth deployable antenna (BBDA) manufactured
by Harris Corporation which will receive various AIS, broadcasting, and noise from
159.0125-1260.0 MHz as a part of the payload experiment. Figure 2-7, Figure 2-9, and
Figure 2-10 detail the pattern of the BBDA at 159.0125 MHz, 195 MHz, 397.5 MHz, and
1260.0 MHz respectively. Specific frequency bands of the receiver are outlined in Table
2-2. Successful demonstration of this antenna technology will improve the state of the
art for cubesat wideband deployable antennas.




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Figure 2-7: BBDA Directivity, 159.0125 MHz




  Figure 2-8: BBDA Directivity, 195 MHz



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 Figure 2-9: BBDA Directivity, 397.5 MHz




 Figure 2-10: BBDA Directivity, 1260 MHz


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2.3.3 HSAT-1 Ground Terminal Antenna
HSAT-1’s secondary TT&C communications uplink (the Globalstar Radio being the
primary) will utilize a 4.2 meter parabolic dish antenna located at N28.103789,
W80.676004 (NAD83) on the roof of a Harris Corporation facility in Melbourne FL to
send TT&C to the HSAT-1 spacecraft. This antenna will provide 37 dBic transmit gain
within the operating frequency band of 2005-2006.25 MHz, with 2.5° half-power
beamwidth. Figure 2-11 details the radiating pattern of the antenna. No other ground
stations will communicate directly with HSAT-1.
This antenna will also receive TT&C and payload experiment data transmitted by the
satellite at 2180-2185 MHz.




         Figure 2-11: HSAT-1 Ground Terminal Antenna Normalized Gain

2.4    Harris “Stop Buzzer” Contact
Bob Johnson, Lead Communications Engineer
rjohns05@harris.com
Harris Corporation SIS, Palm Bay FL
321-729-3260




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                                               Table 2-2: Radio Frequency Spectrum Summary for HSAT-1
                                                                   Modem /                           ERP Active Band
  Type        Location          Function         Description                    Antenna Type                         Polarization Modulation         Waveform & Coding
                                                                   Receiver                          (W)    (MHz)
            HSAT-1 Satellite Comm Downlink     Globalstar
                                                                   GSP-1720     GAT-17PP Patch       0.76   1610-1626.5     LHCP     QPSK/CDMA        Reference Globalstar
             (Mobile Sat)    Default/Primary Space-to-space
                                                                                                                                                    Rolloff factor 0.25, Reed-
                                                                    Tethers
            HSAT-1 Satellite Comm Downlink          S-Band                                                                                              Solomon 255/239
                                                                   Unlimited     Passive Patch       6.0     2180-2185      LHCP        8PSK
Emitters     (Mobile Sat)      Secondary         Space-to-Earth
                                                                   Swift-SLX
                                                                                                                                                             7-7/8 CC
                                                                                                                                                     5 MHz Occupied BW
                                                                                                                                                    Rolloff factor 0.25, 7-1/2
             Melbourne, FL  Harris Ground           S-Band
                                                                     Harris    Parabolic Reflector   4800   2005-2006.25    RHCP     Offset QPSK                CC
                (Fixed)    Terminal (Uplink)     Earth-to-space
                                                                                                                                                    1.25 MHz Occupied BW
            HSAT-1 Satellite                          L1         NovAtel
                                 GPS                                       Passive Patch                      1575.42       RHCP         GPS L1 waveform, C/A coding
             (Mobile Sat)                       Space-to-Space OEM615 GPS
            HSAT-1 Satellite Comm Uplink          Globalstar
                                                                GSP-1720  GAT-17PP Patch                    2483.5-2500     LHCP     QPSK/CDMA           Ref Globalstar
             (Mobile Sat)    Default/Primary    Space-to-Space
                                                                 Tethers                                                                            Rolloff factor 0.25, 7-1/2
            HSAT-1 Satellite   Comm Uplink         S-Band
                                                                Unlimited  Passive Patch                    2005-2006.25    RHCP     Offset QPSK    CC; 1.25 MHz Occupied
             (Mobile Sat)       Secondary       Earth-to-Space
                                                                Swift-SLX                                                                                       BW
                               Harris Ground                                                                                                        Rolloff factor 0.25, Reed-
Receivers    Melbourne, FL                          S-Band                       4.2m Parabolic      NA
                                 Terminal                            Harris                                  2180-2185      LHCP        8PSK        Solomon 255/239, 7-7/8
                (Fixed)                          Space-to-Earth                     Reflector
                                (Downlink)                                                                                                          CC; 5 MHz Occupied BW
            HSAT-1 Satellite                       AIS signal                    AIS Monopole
                             AIS "Channel A"                                                                155.98-162.10   Linear                 AIS waveform
             (Mobile Sat)                           receiver                        Antenna
                                                                   Harris Corp
                                                                  PN 3266638-      Broad  Band              155.98-162.10
            HSAT-1 Satellite                     VHF/UHF/L-           101      Deployable Antenna             174-216
                             UHF "Channel B"                                                                                Linear      AIS, VHF Broadcast, Solar noise
             (Mobile Sat)                        band receiver                     Harris Corp                385-410
                                                                                  3266643-101                1220-1300




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Document Created: 2016-08-22 10:34:09
Document Modified: 2016-08-22 10:34:09

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