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List of GPS satellites

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This is an old revision of this page, as edited by 172.88.233.48 (talk) at 00:45, 2 March 2019 (SVN74 (GPS IIIA-01) is broadcasting PRN04, not PRN13, per NANU 2019001 and confirmed with my receiver.). The present address (URL) is a permanent link to this revision, which may differ significantly from the current revision.

Samples of three GPS satellites' orbits over a five-year period (2013 to 2018)
   USA-242 ·   USA-239 ·   USA-151 ·   Earth

As of December 2018, 73 Global Positioning System navigation satellites have been launched, 31 of which are operational, 9 in reserve, 1 being tested, 30 have been retired and 2 were lost at launch. The constellation requires a minimum of 24 operational satellites, and the official target count is 33.[1]

SVNs are "space vehicle numbers" which are serial numbers assigned to each GPS satellite. PRNs are the "pseudo-random noise" sequences, or Gold codes, that each satellite transmits to differentiate itself from other satellites in the active constellation.

Satellites

Satellites by launch date

Satellite Launch (UTC) Carrier rocket Launch site Block № SVN PRN Slot Status
Remarks
OPS 5111 22 February 1978
23:44 		Atlas E/F SGS-1 VAFB SLC-3E I 1[2] 01 04 Retired
17 July 1985[3]
OPS 5112 13 May 1978
10:34 		Atlas E/F SGS-1 VAFB SLC-3E I 2[4] 02 07 Retired
12 February 1988[3]
OPS 5113 7 October 1978
00:28 		Atlas E/F SGS-1 VAFB SLC-3E I 3[5] 03 06 Retired
18 May 1992[3]
OPS 5114 11 December 1978
03:59 		Atlas E/F SGS-1 VAFB SLC-3E I 4[6] 04 08 Retired
14 October 1989[3]
Used for testing between February 1990 and May 1990[3]
OPS 5117 9 February 1980
23:08 		Atlas E/F SGS-1 VAFB SLC-3E I 5[7] 05 05 Retired
11 May 1984[3]
OPS 5118 26 April 1980
22:00 		Atlas E/F SGS-1 VAFB SLC-3E I 6[8] 06 09 Retired
6 March 1991[3]
N/A
(Navstar 7) 		19 December 1981
01:10 		Atlas E/F SGS-1 VAFB SLC-3E I 7 07 10 N/A[3]
Failed to orbit
OPS 9794 14 July 1983
10:21 		Atlas E/F SGS-2 VAFB SLC-3W I 8[9] 08 11 Retired
4 May 1993[3]
USA-1 13 June 1984
11:37 		Atlas E/F SGS-2 VAFB SLC-3W I 9[10] 09 13 Retired
28 February 1994[3]
Used for testing between February 1994 and June 1994[3]
USA-5 8 September 1984
21:41 		Atlas E/F SGS-2 VAFB SLC-3W I 10[11] 10 12 Retired
18 November 1995[3]
Used for testing between November 1995 and March 1996[3]
USA-10 9 October 1985
02:53 		Atlas E/F SGS-2 VAFB SLC-3W I 11[12] 11 03 Retired
13 April 1994[3]
N/A
(Block II prototype) 		II 0 12 N/A
Qualification vehicle built by Rockwell International to secure Block II contract; never launched
USA-35 14 February 1989
18:30 		Delta II 6925-9.5 CCAFS LC-17A[13] II 1[14] 14 14 Retired
26 March 2000[15]
USA-38 10 June 1989
22:30 		Delta II 6925-9.5 CCAFS LC-17A[13] II 2[16] 13 02 B3 Retired
22 February 2004[15]
USA-42 18 August 1989
05:58 		Delta II 6925-9.5 CCAFS LC-17A[13] II 3[17] 16 16 Retired
13 October 2000[15]
USA-47 21 October 1989
09:31 		Delta II 6925-9.5 CCAFS LC-17A[13] II 4[18] 19 19 A5 Retired
16 March 2001[15]
USA-49 11 December 1989
18:10 		Delta II 6925-9.5 CCAFS LC-17B[13] II 5[19] 17 17 D3 Retired
23 February 2005[15]
USA-50 24 January 1990
22:55 		Delta II 6925-9.5 CCAFS LC-17A[13] II 6[20] 18 18 Retired
18 August 2000[15]
USA-54 26 March 1990
02:45 		Delta II 6925-9.5 CCAFS LC-17A[13] II 7[21] 20 20 Retired
21 May 1996[15]
Decommissioned after twice changing frequency without being commanded to
USA-63 2 August 1990
05:39 		Delta II 6925-9.5 CCAFS LC-17A[13] II 8[22] 21 21 E2 Retired
25 September 2002[15]
USA-64 1 October 1990
21:56 		Delta II 6925-9.5 CCAFS LC-17A[13] II 9[23] 15 15 D5 Retired
17 November 2006[15]
Used only for testing from November 2006 until March 2007[15]
USA-66 26 November 1990
21:39 		Delta II 7925-9.5 CCAFS LC-17A IIA 1[24] 23 23
32 		E5 Retired
25 January 2016[25]
Decommissioned from active service using PRN23 on 13 February 2004. Set usable with PRN32 on 26 February 2008.[15]
USA-71 4 July 1991
02:32 		Delta II 7925-9.5 CCAFS LC-17A IIA 2[26] 24 24 D1 Retired
30 September 2011[27]
USA-79 23 February 1992
22:29 		Delta II 7925-9.5 CCAFS LC-17A IIA 3[28] 25 25 A2 Retired
18 December 2009[29]
USA-80 10 April 1992
03:20 		Delta II 7925-9.5 CCAFS LC-17B IIA 4[30] 28 28 C2 Retired
4 November 1996[15]
Retired early, replaced by USA-117
USA-83 7 July 1992
09:20 		Delta II 7925-9.5 CCAFS LC-17B IIA 5[31] 26 26 F5 Retired
6 January 2015[32]
USA-84 9 September 1992
08:57 		Delta II 7925-9.5 CCAFS LC-17A IIA 6[33] 27 27 A6 10 August 2011[29]
In Reserve[34]
Final command and disposal on 18 April 2017
USA-85 22 November 1992
23:54 		Delta II 7925-9.5 CCAFS LC-17A IIA 7[35] 32 31
01
30
NA 		F4 17 March 2008[29]
In Reserve[34]
PRN changed from 32 to 01 in January 1993 due to receiver problems. Decommissioned 17 March 2008 and removed from slot F4. Briefly resumed L-band transmission in 2014 but signal unusable.[15][29]
USA-87 18 December 1992
22:16 		Delta II 7925-9.5 CCAFS LC-17B IIA 8[36] 29 29 F5 Retired
23 October 2007[37]
USA-88 3 February 1993
02:55 		Delta II 7925-9.5 CCAFS LC-17A IIA 9[38] 22 22 B1 Retired
3 December 2002[15]
USA-90 30 March 1993
03:09 		Delta II 7925-9.5 CCAFS LC-17A IIA 10[39] 31 31 C3 Retired
24 October 2005
USA-91 13 May 1993
00:07 		Delta II 7925-9.5 CCAFS LC-17A IIA 11[40] 37 07
01
24 		C4 20 December 2007
In Reserve[34]
Switched to PRN01 in October 2008 but was unusable.[15] Switched to PRN24 in April 2012 but was unusable.[41]
USA-92 26 June 1993
13:27 		Delta II 7925-9.5 CCAFS LC-17A IIA 12[42] 39 09 A5 Retired
19 May 2014[29]
USA-94 30 August 1993
12:38 		Delta II 7925-9.5 CCAFS LC-17B IIA 13[43] 35 05
30 		B5 28 March 2013[15]
In Reserve[34]
Decommissioned from active service using PRN05 in March 2009. Resumed activity using PRN30 in August 2011.[15]
USA-96 26 October 1993
17:04 		Delta II 7925-9.5 CCAFS LC-17B IIA 14[44] 34 04
18 		D6 Operational[45]
Decommissioned from active service using PRN04 in November 2015.[46] Reactivated in March 2018 using PRN18. [45]
USA-100 10 March 1994
03:40 		Delta II 7925-9.5 CCAFS LC-17A IIA 15[47] 36 06 C6 21 February 2014[29]
In Reserve[34]
USA-117 28 March 1996
00:21 		Delta II 7925-9.5 CCAFS LC-17B IIA 16[48] 33 03 C5 Retired
2 August 2014[49]
USA-126 16 July 1996
00:50 		Delta II 7925-9.5 CCAFS LC-17A IIA 17[50] 40 10 E6 16 July 2015[51]
In Reserve[34]
USA-128 12 September 1996
08:49 		Delta II 7925-9.5 CCAFS LC-17A IIA 18[52] 30 30 B2 Retired
20 July 2011[29]
N/A
(GPS IIR-1) 		17 January 1997
16:28 		Delta II 7925-9.5 CCAFS LC-17A IIR 1 42 12 N/A[29]
Failed to orbit
USA-132 23 July 1997
03:43 		Delta II 7925-9.5[53] CCAFS LC-17A IIR 2 43 13 F6 Operational[29]
USA-135 6 November 1997
00:30 		Delta II 7925-9.5 CCAFS LC-17A IIA 19[54] 38 08 A3 30 October 2014[55]
In Reserve[34]
USA-145 7 October 1999
12:51 		Delta II 7925-9.5[56] CCAFS SLC-17A IIR 3 46 11 D5 Operational[29]
USA-150 11 May 2000
01:48 		Delta II 7925-9.5[57] CCAFS SLC-17A IIR 4 51 20 E4 Operational[29]
USA-151 16 July 2000
09:17 		Delta II 7925-9.5[58] CCAFS SLC-17A IIR 5 44 28 B3 Operational[29]
USA-154 10 November 2000
17:14 		Delta II 7925-9.5[59] CCAFS SLC-17A IIR 6 41 14 F1 Operational[29]
USA-156 30 January 2001
07:55 		Delta II 7925-9.5[60] CCAFS SLC-17A IIR 7 54 18 E4 Retired
5 March 2018[61]
USA-166 29 January 2003
18:06 		Delta II 7925-9.5[62] CCAFS SLC-17B IIR 8 56 16 B1 Operational[29]
USA-168 31 March 2003
22:09 		Delta II 7925-9.5[63] CCAFS SLC-17A IIR 9 45 21 D3 Operational[29]
USA-175 21 December 2003
08:05 		Delta II 7925-9.5[64] CCAFS SLC-17A IIR 10 47 22 E6 Operational[29]
USA-177 20 March 2004
17:53 		Delta II 7925-9.5[65] CCAFS SLC-17B IIR 11 59 19 C5 Operational[29]
USA-178 23 June 2004
22:54 		Delta II 7925-9.5[66] CCAFS SLC-17B IIR 12 60 23 F4 Operational[29]
USA-180 6 November 2004
05:39 		Delta II 7925-9.5[67] CCAFS SLC-17B IIR 13 61 02 D1 Operational[29]
USA-183 26 September 2005
03:37 		Delta II 7925-9.5[68] CCAFS SLC-17A IIRM 1 53 17 C4 Operational[29]
Also known as IIR-14; first to broadcast L2C signal.
USA-190 25 September 2006
18:50 		Delta II 7925-9.5[69] CCAFS SLC-17A IIRM 2 52 31 A2 Operational[29]
Also known as IIR-15; first satellite to complete a fully operational 32-satellite constellation
USA-192 17 November 2006
19:12 		Delta II 7925-9.5[70] CCAFS SLC-17A IIRM 3 58 12 B4 Operational[29]
Also known as IIR-16
USA-196 17 October 2007
12:23 		Delta II 7925-9.5[71] CCAFS SLC-17A IIRM 4 55 15 F2 Operational[29]
Also known as IIR-17
USA-199 20 December 2007
20:04 		Delta II 7925-9.5[72] CCAFS SLC-17A IIRM 5 57 29 C1 Operational[29]
Also known as IIR-18
USA-201 15 March 2008
06:10 		Delta II 7925-9.5[73] CCAFS SLC-17A IIRM 6 48 07 A4 Operational[29]
Also known as IIR-19
USA-203 24 March 2009
08:34 		Delta II 7925-9.5[74] CCAFS SLC-17A IIRM 7 49 01
27
30
06
NA 		B6 In Reserve
Also known as IIR-20; broadcasts demonstration L5 signal. Never entered service due to poor quality signal; decommissioned on 6 May 2011 but subsequently reactivated for testing. Broadcast PRN-01 before decommissioning, PRN-27 after reactivation. Shifted to PRN-30 as of 8 May 2013 and to PRN-06 as of 3 April 2014. Currently not assigned a PRN.[29]
USA-206 17 August 2009
10:35 		Delta II 7925-9.5 CCAFS SLC-17A IIRM 8 50 05 E3 Operational[29]
Originally scheduled for launch in 1999 as IIR-3 but damaged during processing. Also known as IIR-21; L5 services disconnected from J2 port before launch. Final Delta II launch with a US Air Force payload.[75] Final launch from SLC-17A, final Delta II 7925.
USA-213 28 May 2010
03:00 		Delta IV M+(4,2) CCAFS SLC-37B IIF 1 62 25 B2 Operational[29]
First to broadcast operational L5 signal.
USA-232 16 July 2011
06:41 		Delta IV M+(4,2) CCAFS SLC-37B IIF 2 63 01 D2 Operational[29]
USA-239 4 October 2012
12:10 		Delta IV M+(4,2) CCAFS SLC-37B IIF 3 65 24 A1 Operational[29]
USA-242 15 May 2013
21:38 		Atlas V 401 CCAFS SLC-41 IIF 4 66 27 C2 Operational[29]
USA-248 21 February 2014
01:59 		Delta IV M+(4,2) CCAFS SLC-37B IIF 5 64 30 A3 Operational[29]
USA-251 17 May 2014
00:03 		Delta IV M+(4,2) CCAFS SLC-37B IIF 6 67 06 D4 Operational[29]
USA-256 2 August 2014
03:23 		Atlas V 401 CCAFS SLC-41 IIF 7 68 09 F3 Operational[29]
USA-258 29 October 2014
17:21 		Atlas V 401 CCAFS SLC-41 IIF 8 69 03 E1 Operational[29]
USA-260 25 March 2015
18:36 		Delta IV M+(4,2) CCAFS SLC-37B IIF 9 71 26 B5 Operational[29]
USA-262 15 July 2015
15:36 		Atlas V 401 CCAFS SLC-41 IIF 10 72 08 C3 Operational[29]
USA-265 31 October 2015
16:13 		Atlas V 401 CCAFS SLC-41 IIF 11 73 10 E2 Operational[76]
USA-266 5 February 2016
13:38 		Atlas V 401 CCAFS SLC-41 IIF 12 70 32 F5 Operational[77]
USA-289
Vespucci[78] 		23 December 2018
13:51 		Falcon 9 Block 5 CCAFS SLC-40 IIIA 1 74 04 F6 Testing[78]

Satellites by block

Block Launched Operational Testing/
Reserve 		Unhealthy Retired Launch
Failures 		Remarks
Block I 11 0 0 0 10 1
Block II 9 0 0 0 9 0 One prototype was never launched
Block IIA 19 0 8 0 11 0
Block IIR 13 12 0 0 0 1
Block IIRM 8 7 1 0 0 0
Block IIF 12 12 0 0 0 0
Block IIIA 1 0 1 0 0 0
Total 73 31 10 0 30 2

Orbital slots (by SVN)

Refer to GPS Constellation Status for the most up-to-date information.

As of 23 December 2018
Slot Plane
A B C D E F
1 65 56 57 61 69 70
2 52 62 66 63 73 55
3 64 44 72 45 50 68
4 48 58 53 67 51 60
5 71 59 46 41
6 34 47 43 (74)

Numbers in parentheses refer to non-operational satellites.

Once launched, GPS satellites do not change their plane assignment but slot assignments are somewhat arbitrary and are subject to change.

Cross reference of PRNs to satellite blocks

The following table is for the purpose of making it possible to determine the block associated with a PRN by looking at one column in one table rather than having to search through all rows of three tables. Thus this table can be used to quickly and easily determine the number of satellites in orbit and health associated with each block.

Cross reference of PRNs to blocks
PRN 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 NA
IIA D H R(x8)
IIR H H H H H H H H H H H
IIR-M H H H H H H H R
IIF H H H H H H H H H H H H
IIIA T

Legend:

  • H – In orbit and healthy
  • R – Placed in reserve
  • U – Unhealthy and unusable
  • D – Decommissioned
  • T – Launched and undergoing testing

PRN to SVN history

This section is for the purpose of making it possible to determine the PRN associated with a SVN at a particular epoch. For example, SVN 049 had been assigned PRNs 01, 24, 27, and 30 at different times of its lifespan, whereas PRN 01 had been assigned to SVNs 032, 037, 049, 035, and 063 at different epochs. This information can be found in the IGS ANTEX file, which uses the convention "GNN" and "GNNN" for PRNs and SVNs, respectively. For example, SVN 049 is described as: 

BLOCK IIR-M         G01                 G049      2009-014A TYPE / SERIAL NO    
  2009     3    24     0     0    0.0000000                 VALID FROM          
  2011     5     6    23    59   59.9999999                 VALID UNTIL         
BLOCK IIR-M         G24                 G049      2009-014A TYPE / SERIAL NO    
  2012     2     2     0     0    0.0000000                 VALID FROM          
  2012     3    14    23    59   59.9999999                 VALID UNTIL         
BLOCK IIR-M         G24                 G049      2009-014A TYPE / SERIAL NO    
  2012     8     9     0     0    0.0000000                 VALID FROM          
  2012     8    22    23    59   59.9999999                 VALID UNTIL         
BLOCK IIR-M         G27                 G049      2009-014A TYPE / SERIAL NO    
  2012    10    18     0     0    0.0000000                 VALID FROM          
  2013     5     9    23    59   59.9999999                 VALID UNTIL         
BLOCK IIR-M         G30                 G049      2009-014A TYPE / SERIAL NO    
  2013     5    10     0     0    0.0000000                 VALID FROM

whereas for PRN 01 the following excerpt is relevant: 

BLOCK IIA           G01                 G032      1992-079A TYPE / SERIAL NO    
  1992    11    22     0     0    0.0000000                 VALID FROM          
  2008    10    16    23    59   59.9999999                 VALID UNTIL         
BLOCK IIA           G01                 G037      1993-032A TYPE / SERIAL NO    
  2008    10    23     0     0    0.0000000                 VALID FROM          
  2009     1     6    23    59   59.9999999                 VALID UNTIL         
BLOCK IIR-M         G01                 G049      2009-014A TYPE / SERIAL NO    
  2009     3    24     0     0    0.0000000                 VALID FROM          
  2011     5     6    23    59   59.9999999                 VALID UNTIL         
BLOCK IIA           G01                 G035      1993-054A TYPE / SERIAL NO    
  2011     6     2     0     0    0.0000000                 VALID FROM          
  2011     7    12    23    59   59.9999999                 VALID UNTIL         
BLOCK IIF           G01                 G063      2011-036A TYPE / SERIAL NO    
  2011     7    16     0     0    0.0000000                 VALID FROM

A table extracted out of the ANTEX file is made available by the Bernese GNSS Software.

Planned launches

Block IIIA

Main article: GPS Block IIIA
Date Rocket Launch site Satellite SVN Remarks
April 4, 2019[79] Delta IV Medium+ (4,2)[79] CCAFS SLC-37 GPS IIIA-02 75 Space vehicle manufacturing contract awarded January 2012.[80] Declared Available For Launch (AFL) on August 10, 2018.[81] Originally scheduled to launch on a SpaceX Falcon 9 rocket, but, in Spring 2017, the Air Force swapped to the United Launch Alliance Delta IV originally scheduled to launch GPS IIIA-01.[82] ULA did not submit a bid for launch services before the swap.[83]
October 2019[79] Falcon 9 Block 5 CCAFS SLC-40 or KSC LC-39A[84] GPS IIIA-03 76 Space vehicle manufacturing contract awarded January 2012.[80] The space vehicle was fully assembled on August 14, 2017.[85][86] Completed thermal vacuum testing in June 2018.[81] SpaceX won a $96.5 million contract to launch the satellite.[87]
2020[86][88] Falcon 9 Block 5 CCAFS SLC-40 or KSC LC-39A[84] GPS IIIA-04 77 Space vehicle manufacturing contract awarded January 2012.[80] Undergoing thermal vacuum testing in December 2018.[89] The Request For Proposal (RFP) for launch services was published in June 2017, and proposals were due in August 2017.[90] Launch services for SV-04 through -06 were to be jointly awarded to the same winning bidder.[91][90] In March 2018, the Air Force announced it had awarded the contract to SpaceX (over another unnamed competing bidder).[92]
Falcon 9 Block 5[93] CCAFS SLC-40 or KSC LC-39A[84] GPS IIIA-05 78 Space vehicle manufacturing contract awarded February 2013.[94] Core mating in progress in December 2018.[89] Launch services for SV-04 through -06 were jointly awarded.[91][90]
2021[86] Falcon 9 Block 5[93] CCAFS SLC-40 or KSC LC-39A[84] GPS IIIA-06 79 Space vehicle manufacturing contract awarded February 2013.[94] In September 2018, the space vehicle was integrating harnesses.[81] Launch services for SV-04 through -06 were jointly awarded.[90]
CCAFS (TBD) GPS IIIA-07 80 Space vehicle manufacturing contract awarded February 2013.[94] It was in assembly in December 2018.[89]
2022[86] CCAFS (TBD) GPS IIIA-08 81 Space vehicle manufacturing contract awarded February 2013.[94]
CCAFS (TBD) GPS IIIA-09 82 Space vehicle manufacturing contract awarded September 2016.[95]
2023[86] CCAFS (TBD) GPS IIIA-10 83

Block IIIF

Main article: GPS Block IIIF
Projected Available For Launch ("AFL") Date Rocket Type Launch site Satellite SVN Remarks
FY2026[86] (TBD) (TBD) CCAFS (TBD) GPS IIIF-01
GPS IIIF-02
GPS IIIF-03
FY2027[86] GPS IIIF-04
GPS IIIF-05
GPS IIIF-06
FY2028[86] GPS IIIF-07 Technology Insertion Point
GPS IIIF-08
GPS IIIF-09
GPS IIIF-10
FY2029[86] GPS IIIF-11
GPS IIIF-12
FY2030[86] GPS IIIF-13 Technology Insertion Point
GPS IIIF-14
FY2031[86] GPS IIIF-15
GPS IIIF-16
FY2032[86] GPS IIIF-17
GPS IIIF-18
FY2033[86] GPS IIIF-19 Technology Insertion Point
GPS IIIF-20
FY2034[86] GPS IIIF-21
GPS IIIF-22

See also

References

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  71. ^ "GPS 2R-17". NASA. Retrieved 26 April 2013.
  72. ^ "GPS 2R-18". NASA. Retrieved 26 April 2013.
  73. ^ "Navstar 62". NASA. Retrieved 26 April 2013.
  74. ^ "Navstar 62". NASA. Retrieved 26 April 2013.
  75. ^ "Navstar 63". NASA. Retrieved 26 April 2013.
  76. ^ "NANU 2015-093". Retrieved 10 December 2015.
  77. ^ "NANU 2016-011". Retrieved 9 March 2016.
  78. ^ a b Clark, Stephen (23 December 2018). "SpaceX closes out year with successful GPS satellite launch". Spaceflight Now. Retrieved 24 December 2018.
  79. ^ a b c "Launch Schedule". Spaceflight Now. 9 November 2018. Retrieved 10 November 2018.
  80. ^ a b c "U.S. Air Force Awards Lockheed Martin Contract for Third and Fourth GPS III Satellites". Lockheed Martin. 12 January 2012. Retrieved 3 January 2017.
  81. ^ a b c "GPS Status and Modernization Progress: Service, Satellites, Control Segment, and Military GPS User Equipment" (PDF). US Air Force Space and Missile Systems Center. 26 September 2018. Retrieved 10 November 2018.
  82. ^ "Better Planning and Coordination Needed to Improve Prospects for Fielding Modernized Capability" (PDF). GAO. December 2017. Retrieved 10 November 2018. Independent of OCX development, the Air Force moved the first GPS III target launch date from March to May 2018 in the spring of 2017. According to Air Force officials, the change was the result of a decision to launch the first GPS III satellite on a Falcon 9 rocket, rather than a Delta IV.
  83. ^ "ULA declines bid for next generation GPS launch contract". Spaceflight Insider. 18 November 2015. Retrieved 10 November 2018.
  84. ^ a b c d Foust, Jeff (8 December 2017). "New and improved Florida pad ready to resume Falcon 9 launches". SpaceNews.com. SpaceNews. Retrieved 18 December 2017.
  85. ^ Cozzens, Tracy (27 November 2017). "Lockheed Martin assembles third U.S. Air Force GPS III satellite". GPS World. North Coast Media LLC. Retrieved 1 December 2017.
  86. ^ a b c d e f g h i j k l m n Gleckel, Gerry (15 November 2017). "GPS Status & Modernization Progress" (PDF). GPS.gov. Retrieved 1 December 2017.
  87. ^ "SpaceX wins its second GPS 3 launch contract". SpaceNews. 14 March 2017. Retrieved 10 November 2018.
  88. ^ Divis, Dee Ann (28 September 2017). "GNSS Program Update: Dozens of NavSats Set to Launch in Next 40 Months". InsideGNSS.com. Gibbons Media & Research LLC. Retrieved 4 October 2017.
  89. ^ a b c Whitney, Steve (5 December 2018). "GPS Enterprise Status and Modernization" (PDF). U.S. Air Force Space and Missile Systems Center Public Affairs Office. Retrieved 22 December 2018.
  90. ^ a b c d "EELV Phase 1A Request for Proposal (RFP) 1A-4". FedBizOpps.gov. Department of the Air Force. 29 June 2017. Retrieved 6 July 2017.
  91. ^ a b "Final RFP Released for Launch Services Contract". U.S. Air Force Space and Missile Systems Center Public Affairs Office. 29 June 2017. Retrieved 2 December 2017.
  92. ^ "Contracts for March 14, 2018". U.S. DEPARTMENT OF DEFENSE. Retrieved 15 March 2018.
  93. ^ a b "Air Force Awards Launch Services Contracts to SpaceX and ULA". LosAngeles.af.mil. US Air Force Space and Missile Command Public Affairs. 14 March 2018. Retrieved 16 March 2018.
  94. ^ a b c d "Air Force Awards Lockheed Martin Contracts for Next Set of GPS III Satellites". GPS World. 26 February 2013. Retrieved 2 December 2017.
  95. ^ "SMC exercises contract options to procure two additional GPS III satellites" (Press release) United States Air Force. 2016-09-21
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