ODAR Update

0353-EX-CN-2018 Text Documents

PointView Tech LLC

2018-07-20ELS_213198

Pantelis Michalopoulos
202 429 6494
pmichalo@steptoe.com
1330 Connecticut Avenue, NW
Washington, DC 20036-1795
202 429 3000 main
www.steptoe.com




Filed Electronically

July 20, 2018

Ms. Marlene H. Dortch
Secretary
Federal Communications Commission
445 12th Street, S.W.
Washington, D.C. 20554

Re:      PointView Tech, LLC, 0353-EX-CN-2018, Orbital Debris Mitigation

Dear Ms. Dortch:

        Attached to this letter is an updated orbital debris assessment report (updating the report
filed as Exhibit 2 to the narrative portion of the application in File No. 0353-EX-CN-2018) for
PointView Tech, LLC’s (“PointView’s”) proposed spacecraft.

       As stated in the original report, a design to demise approach was taken for the Athena
spacecraft. High heat of ablation materials (like titanium) were used only when absolutely
required by the system manufacturers to guarantee launch survivability and in-orbit performance.
This updated report reflects further refinement of the calculations based on additional, granular
information obtained directly from equipment manufacturers. The prior report submitted by
PointView already established that the proposed spacecraft would satisfy all orbital debris
requirements set forth in the applicable NASA Technical Standard. This update reinforces that
conclusion: only one component type is expected to survive re-entry, compared to three
component types initially expected to do so. Correspondingly, the total debris area is 1.68 m2
(from an initial estimate of 2.73 m2).


         The attached updated version is submitted for the public record.

                                              Sincerely,


                                              Pantelis Michalopoulos
                                              Counsel to PointView Tech, LLC


Athena De-orbit/Re-entry and Casualty Analysis

July 2018




                  1


DAS De-Orbit and Casualty Analysis

 DAS is a software program generated by NASA for orbital debris control and risk mitigation.
 Space programs and projects that use atmospheric reentry as a means of disposal for space
   structure need to limit the amount of debris that can survive reentry and pose a threat to
   people on the surface of the earth.
 The risk of human casualty is determined for objects returning to Earth’s surface with a
   kinetic energy exceeding 15 Joules. The expected debris casualty area (DCA) is based on
   the quantity of each surviving object multiplied by its casualty area.
       Each object’s DCA is the debris field at earth’s surface from one part of the satellite
        breaking up, but not fully immolating/sublimating during reentry. It is calculated based
        on the cross-sectional area of the remaining pieces, the dimensions of a person and the
        path angle of the velocity vector at impact.
 The casualty risk is the product of the total expected debris casualty area and the statistical
   population density based on the orbital inclination and the year of return.
       The software program incorporate computations of world population densities up to the
        year 2050.
 In order to calculate the risk of human casualty, the arrangement of each element of the
   space structure needs to be defined to assess its reentry survival potential.
       The spacecraft configuration and each of its units/items have to be defined in terms of
        body type, size, thermal mass, material etc. as input to the software.
       The output gives the demise altitude, size of remaining item post reentry translated to
        debris casualty area, and the corresponding item kinetic energy.




                           2


DAS De-orbit (Re-Entry) Analysis
 DAS Simulation / Re-entry Analysis Result
              Most units/items have demise altitude around 46 to 78km. 2 items survived re-entry
              Total Debris Casualty Area (DCA) is 1.68 m2
Row Num Name                             Parent       Qty      Material                   Body Type   Thermal Mass      Diameter/Width      Length       Height       Demise Alt   Total DCA KE
       1 Root Object                              0          1                                                                                                                            1.68
       2 panels                                   1          8Aluminum (generic)          Box                   3.75                0.57         0.57         0.02            71.7           0      0
       3 Payload item 1                           2          4Titanium (6 Al-4 V)         Cylinder             0.287                0.08         0.03                            0        1.68    242
       4 M Wheel steel section                    1          4Stainless Steel (generic)   Cylinder             0.365                0.05         0.04                         65.7           0      0
       5 SC brackets and misc items               1         20Aluminum (generic)          Box                   0.45                  0.1        0.15           0.1           75.9           0      0
       6 Momentum wheels                          1          4Aluminum (generic)          Box                   1.25                0.14         0.14        0.045            69.8           0      0
       7 Star Tracker head electronics            1          2Aluminum (generic)          Box                   0.71                0.11         0.11         0.05            72.1           0      0
       8 Star Tracker head cone                   1          2Aluminum (generic)          Cylinder              0.25               0.137        0.117                         76.6           0      0
       9 TTC antennas                             1          2Aluminum (generic)          Box                   0.21                0.05         0.13         0.04            75.9           0      0
      10 GPS antennas                             1          2Aluminum (generic)          Box                   0.19                  0.1         0.1         0.06            76.3           0      0
      11 Gyros                                    1          2Aluminum (generic)          Box                   0.06               0.036        0.039        0.022            75.5           0      0
      12 torque rods                              1          3Copper Alloy                Box                     0.4               0.05           0.4        0.05            76.9           0      0
      13 TTC Radio                                1          1Aluminum (generic)          Box                   2.37                0.13         0.17        0.113            69.5           0      0
      14 TTC Radio top filter box                 1          1Aluminum (generic)          Box                    0.2               0.051        0.051        0.044            73.9           0      0
      15 C&DH computer                            1          1Aluminum (generic)          Box                   6.84                 0.2        0.206         0.15              61           0      0
      16 Battery                                  1          1Aluminum (generic)          Box                   7.15               0.184           0.2       0.112            57.7           0      0
      17 Power Distribution                       1          1Aluminum (generic)          Box                   4.78               0.173         0.22        0.084            63.2           0      0
      18 Thermal MLI and hardware                 1         12Graphite Epoxy 1            Box                  0.425                  0.4          0.4        0.01            77.8           0      0
      19 Magnetometer                             1          2Aluminum (generic)          Box                   0.11               0.035        0.083        0.033            76.1           0      0
      20 Payload item 2                           1          2Aluminum (generic)          Box                   3.75               0.211        0.236        0.061            65.4           0      0
      21 Payload item 3                           1          1Aluminum (generic)          Box                   4.42               0.211        0.234        0.057            62.9           0      0
      22 Payload item 4                           1          1Aluminum (generic)          Box                   2.71               0.145        0.169        0.058            65.2           0      0
      23 Payload item 5                           1          1Aluminum (generic)          Cylinder              2.61                  0.5          0.2                        75.7           0      0
      24 Payload item 6                           1          1Aluminum (generic)          Box                   7.03                0.18        0.235         0.15            62.9           0      0
      25 Payload item 7                           1          1Aluminum (generic)          Box                  14.93               0.255           0.3        0.18            54.2           0      0
      26 Payload item 8                           1          1Aluminum (generic)          Box                   5.17               0.206        0.251        0.095            64.3           0      0
      27 Payload item 9                           1          1Aluminum (generic)          Box                   1.16                0.15         0.15         0.05            71.1           0      0
      28 Payload item 10                          1          1Aluminum (generic)          Cylinder                0.4                 0.1        0.13                         75.2           0      0
      29 Harness (all wiring)                     1         44Copper Alloy                Cylinder              0.25                  0.1          0.4                        77.4           0      0
      30 Payload bracket                          1          4Titanium (6 Al-4 V)         Cylinder              0.03               0.042        0.015                         73.8           0      0
      31 RW Ti bracket                            1          4Titanium (6 Al-4 V)         Box                   0.14               0.032        0.032        0.032            67.4           0      0


   Mass in kg, dimension in meter, area in square meters
   Result in: Demise altitude (km), Total Debris Casualty Area in square meters, and kinetic energy in J.
                                                       3


DAS Casualty Analysis

 The next analysis is the Casualty Analysis
       After the reentry data by knowing the total debris casualty area, one can run the DAS
        analysis for casualty probability
 Only Payload item 1 (4 items) will survive re-entry and resulted in casualty area
       Total DCA is 1.68 square meters
 The Casualty Analysis result from DAS shows 1 in 51400 risk for human casualty
 This is in compliance to the requirement
       DAS based on NASA requirement 4.7-1 in NASA-std-8719.14




                          4


Appendix 1
 DAS is a NASA software program based on NASA-STD-8719.14
      Casualty risk requirement (section 4.7-1)




                          5


Appendix 2
 DAS is a NASA software program based on NASA-STD-8719.14
      Casualty risk based on inclination




                         6


Appendix 3 – DAS 2.0.2 Log




                   7


                                           DAS Activity Log

06 13 2018; 14:15:37PM DAS Application Started

06 13 2018; 14:15:42PM Opened Project C:\Frankie\DAS 2.0\project\Athena\6-2018 run\

06 13 2018; 14:34:20PM Science and Engineering - Re-Entry Survivability Analysis


       ***********INPUT****
        Item Number = 1

       name = Root Object
       quantity = 1
       parent = 0
       materialID = 5
       type = Box
       Aero Mass = 134.000000
       Thermal Mass = 134.000000
       Diameter/Width = 0.575000
       Length = 0.875000
       Height = 0.574000

       name = panels
       quantity = 8
       parent = 1
       materialID = 5
       type = Box
       Aero Mass = 3.893500
       Thermal Mass = 3.750000
       Diameter/Width = 0.570000
       Length = 0.570000
       Height = 0.020000

       name = Payload item 1
       quantity = 4
       parent = 2
       materialID = 65
       type = Cylinder
       Aero Mass = 0.287000
       Thermal Mass = 0.287000
       Diameter/Width = 0.080000
       Length = 0.030000

       name = M Wheel steel section
       quantity = 4
       parent = 1
       materialID = 54
       type = Cylinder
       Aero Mass = 0.365000
       Thermal Mass = 0.365000
       Diameter/Width = 0.050000
       Length = 0.040000

       name = SC brackets and misc items
       quantity = 20
       parent = 1
       materialID = 5
       type = Box
       Aero Mass = 0.450000
       Thermal Mass = 0.450000
       Diameter/Width = 0.100000
       Length = 0.150000
       Height = 0.100000

       name = Momentum wheels
       quantity = 4
       parent = 1
       materialID = 5
       type = Box
       Aero Mass = 1.250000
       Thermal Mass = 1.250000
       Diameter/Width = 0.140000
       Length = 0.140000

                                                 Page 1


                                   DAS Activity Log

Height = 0.045000

name = Star Tracker head electronics
quantity = 2
parent = 1
materialID = 5
type = Box
Aero Mass = 0.710000
Thermal Mass = 0.710000
Diameter/Width = 0.110000
Length = 0.110000
Height = 0.050000

name = Star Tracker head cone
quantity = 2
parent = 1
materialID = 5
type = Cylinder
Aero Mass = 0.250000
Thermal Mass = 0.250000
Diameter/Width = 0.137000
Length = 0.117000

name = TTC antennas
quantity = 2
parent = 1
materialID = 5
type = Box
Aero Mass = 0.210000
Thermal Mass = 0.210000
Diameter/Width = 0.050000
Length = 0.130000
Height = 0.040000

name = GPS antennas
quantity = 2
parent = 1
materialID = 5
type = Box
Aero Mass = 0.190000
Thermal Mass = 0.190000
Diameter/Width = 0.100000
Length = 0.100000
Height = 0.060000

name = Gyros
quantity = 2
parent = 1
materialID = 5
type = Box
Aero Mass = 0.060000
Thermal Mass = 0.060000
Diameter/Width = 0.036000
Length = 0.039000
Height = 0.022000

name = torque rods
quantity = 3
parent = 1
materialID = 19
type = Box
Aero Mass = 0.400000
Thermal Mass = 0.400000
Diameter/Width = 0.050000
Length = 0.400000
Height = 0.050000

name = TTC Radio
quantity = 1
parent = 1
materialID = 5
type = Box

                                        Page 2


                                  DAS Activity Log

Aero Mass = 2.370000
Thermal Mass = 2.370000
Diameter/Width = 0.130000
Length = 0.170000
Height = 0.113000

name = TTC Radio top filter box
quantity = 1
parent = 1
materialID = 5
type = Box
Aero Mass = 0.200000
Thermal Mass = 0.200000
Diameter/Width = 0.051000
Length = 0.051000
Height = 0.044000

name = CDH computer
quantity = 1
parent = 1
materialID = 5
type = Box
Aero Mass = 6.840000
Thermal Mass = 6.840000
Diameter/Width = 0.200000
Length = 0.206000
Height = 0.150000

name = Battery
quantity = 1
parent = 1
materialID = 5
type = Box
Aero Mass = 7.150000
Thermal Mass = 7.150000
Diameter/Width = 0.184000
Length = 0.200000
Height = 0.112000

name = Power Distribution
quantity = 1
parent = 1
materialID = 5
type = Box
Aero Mass = 4.780000
Thermal Mass = 4.780000
Diameter/Width = 0.173000
Length = 0.220000
Height = 0.084000

name = Thermal MLI and hardware
quantity = 12
parent = 1
materialID = 27
type = Box
Aero Mass = 0.425000
Thermal Mass = 0.425000
Diameter/Width = 0.400000
Length = 0.400000
Height = 0.010000

name = Magnetometer
quantity = 2
parent = 1
materialID = 5
type = Box
Aero Mass = 0.110000
Thermal Mass = 0.110000
Diameter/Width = 0.035000
Length = 0.083000
Height = 0.033000


                                       Page 3


                            DAS Activity Log

name = Payload item 2
quantity = 2
parent = 1
materialID = 5
type = Box
Aero Mass = 3.750000
Thermal Mass = 3.750000
Diameter/Width = 0.211000
Length = 0.236000
Height = 0.061000

name = Payload item 3
quantity = 1
parent = 1
materialID = 5
type = Box
Aero Mass = 4.420000
Thermal Mass = 4.420000
Diameter/Width = 0.211000
Length = 0.234000
Height = 0.057000

name = Payload item 4
quantity = 1
parent = 1
materialID = 5
type = Box
Aero Mass = 2.710000
Thermal Mass = 2.710000
Diameter/Width = 0.145000
Length = 0.169000
Height = 0.058000

name = Payload item 5
quantity = 1
parent = 1
materialID = 5
type = Cylinder
Aero Mass = 2.610000
Thermal Mass = 2.610000
Diameter/Width = 0.500000
Length = 0.200000

name = Payload item 6
quantity = 1
parent = 1
materialID = 5
type = Box
Aero Mass = 7.030000
Thermal Mass = 7.030000
Diameter/Width = 0.180000
Length = 0.235000
Height = 0.150000

name = Payload item 7
quantity = 1
parent = 1
materialID = 5
type = Box
Aero Mass = 14.930000
Thermal Mass = 14.930000
Diameter/Width = 0.255000
Length = 0.300000
Height = 0.180000

name = Payload item 8
quantity = 1
parent = 1
materialID = 5
type = Box
Aero Mass = 5.170000
Thermal Mass = 5.170000

                                 Page 4


                                     DAS Activity Log

Diameter/Width = 0.206000
Length = 0.251000
Height = 0.095000

name = Payload item 9
quantity = 1
parent = 1
materialID = 5
type = Box
Aero Mass = 1.160000
Thermal Mass = 1.160000
Diameter/Width = 0.150000
Length = 0.150000
Height = 0.050000

name = Payload item 10
quantity = 1
parent = 1
materialID = 5
type = Cylinder
Aero Mass = 0.400000
Thermal Mass = 0.400000
Diameter/Width = 0.100000
Length = 0.130000

name = Harness (all wiring)
quantity = 44
parent = 1
materialID = 19
type = Cylinder
Aero Mass = 0.250000
Thermal Mass = 0.250000
Diameter/Width = 0.100000
Length = 0.400000

name = Payload bracket
quantity = 4
parent = 1
materialID = 65
type = Cylinder
Aero Mass = 0.030000
Thermal Mass = 0.030000
Diameter/Width = 0.042000
Length = 0.015000

name = RW Ti bracket
quantity = 4
parent = 1
materialID = 65
type = Box
Aero Mass = 0.140000
Thermal Mass = 0.140000
Diameter/Width = 0.032000
Length = 0.032000
Height = 0.032000

**************OUTPUT****
Item Number = 1

name =   Root Object
Demise   Altitude = 77.998129
Debris   Casualty Area = 0.000000
Impact   Kinetic Energy = 0.000000

*************************************
name = panels
Demise Altitude = 71.676160
Debris Casualty Area = 0.000000
Impact Kinetic Energy = 0.000000

*************************************
name = Payload item 1

                                          Page 5


                                     DAS Activity Log

Demise Altitude = 0.000000
Debris Casualty Area = 1.684751
Impact Kinetic Energy = 241.946350

*************************************
name = M Wheel steel section
Demise Altitude = 65.701097
Debris Casualty Area = 0.000000
Impact Kinetic Energy = 0.000000

*************************************
name = SC brackets and misc items
Demise Altitude = 75.926847
Debris Casualty Area = 0.000000
Impact Kinetic Energy = 0.000000

*************************************
name = Momentum wheels
Demise Altitude = 69.827355
Debris Casualty Area = 0.000000
Impact Kinetic Energy = 0.000000

*************************************
name = Star Tracker head electronics
Demise Altitude = 72.098496
Debris Casualty Area = 0.000000
Impact Kinetic Energy = 0.000000

*************************************
name = Star Tracker head cone
Demise Altitude = 76.561293
Debris Casualty Area = 0.000000
Impact Kinetic Energy = 0.000000

*************************************
name = TTC antennas
Demise Altitude = 75.912847
Debris Casualty Area = 0.000000
Impact Kinetic Energy = 0.000000

*************************************
name = GPS antennas
Demise Altitude = 76.331191
Debris Casualty Area = 0.000000
Impact Kinetic Energy = 0.000000

*************************************
name = Gyros
Demise Altitude = 75.495894
Debris Casualty Area = 0.000000
Impact Kinetic Energy = 0.000000

*************************************
name = torque rods
Demise Altitude = 76.937582
Debris Casualty Area = 0.000000
Impact Kinetic Energy = 0.000000

*************************************
name = TTC Radio
Demise Altitude = 69.526738
Debris Casualty Area = 0.000000
Impact Kinetic Energy = 0.000000

*************************************
name = TTC Radio top filter box
Demise Altitude = 73.876777
Debris Casualty Area = 0.000000
Impact Kinetic Energy = 0.000000

*************************************
name = CDH computer

                                          Page 6


                                   DAS Activity Log

Demise Altitude = 61.044710
Debris Casualty Area = 0.000000
Impact Kinetic Energy = 0.000000

*************************************
name = Battery
Demise Altitude = 57.731788
Debris Casualty Area = 0.000000
Impact Kinetic Energy = 0.000000

*************************************
name = Power Distribution
Demise Altitude = 63.249640
Debris Casualty Area = 0.000000
Impact Kinetic Energy = 0.000000

*************************************
name = Thermal MLI and hardware
Demise Altitude = 77.838097
Debris Casualty Area = 0.000000
Impact Kinetic Energy = 0.000000

*************************************
name = Magnetometer
Demise Altitude = 76.052340
Debris Casualty Area = 0.000000
Impact Kinetic Energy = 0.000000

*************************************
name = Payload item 2
Demise Altitude = 65.358769
Debris Casualty Area = 0.000000
Impact Kinetic Energy = 0.000000

*************************************
name = Payload item 3
Demise Altitude = 62.929280
Debris Casualty Area = 0.000000
Impact Kinetic Energy = 0.000000

*************************************
name = Payload item 4
Demise Altitude = 65.231171
Debris Casualty Area = 0.000000
Impact Kinetic Energy = 0.000000

*************************************
name = Payload item 5
Demise Altitude = 75.698715
Debris Casualty Area = 0.000000
Impact Kinetic Energy = 0.000000

*************************************
name = Payload item 6
Demise Altitude = 62.852343
Debris Casualty Area = 0.000000
Impact Kinetic Energy = 0.000000

*************************************
name = Payload item 7
Demise Altitude = 54.167065
Debris Casualty Area = 0.000000
Impact Kinetic Energy = 0.000000

*************************************
name = Payload item 8
Demise Altitude = 64.288780
Debris Casualty Area = 0.000000
Impact Kinetic Energy = 0.000000

*************************************
name = Payload item 9

                                        Page 7


                                   DAS Activity Log

Demise Altitude = 71.110097
Debris Casualty Area = 0.000000
Impact Kinetic Energy = 0.000000

*************************************
name = Payload item 10
Demise Altitude = 75.220504
Debris Casualty Area = 0.000000
Impact Kinetic Energy = 0.000000

*************************************
name = Harness (all wiring)
Demise Altitude = 77.366058
Debris Casualty Area = 0.000000
Impact Kinetic Energy = 0.000000

*************************************
name = Payload bracket
Demise Altitude = 73.760019
Debris Casualty Area = 0.000000
Impact Kinetic Energy = 0.000000

*************************************
name = RW Ti bracket
Demise Altitude = 67.383089
Debris Casualty Area = 0.000000
Impact Kinetic Energy = 0.000000

*************************************

=============== End of Re-Entry Survivability Analysis ===============




                                        Page 8



Document Created: 2018-07-20 14:33:28
Document Modified: 2018-07-20 14:33:28

© 2024 FCC.report
This site is not affiliated with or endorsed by the FCC