Table 1 1.  NTS and Block I Satellite Launch Dates and Status

Navstar

Space

PRN Code

Number

Vehicle No.

Number

Launch Date

Status (June 95)

(SVN)

NTS 1

14 Jul 74

Deactivated

NTS 2

23 Jun 77

Deactivated Jan 78

I 1

1

22 Feb 78

Deactivated 25 Jan 80

I 2

2

12 May 78

Deactivated 30 Aug 80

I 3

3

06 Oct 78

Deactivated 19 Apr 92

I 4

4

11 Dec 78

Deactivated 06 Sep 86

I 5

5

09 Feb 80

Deactivated 28 Nov 83

I 6

6

26 Apr 80

Deactivated 05 Mar 91

I 7

7

18 Dec 81

Launch Failure

I 8

8

14 Jul 83

Deactivated 4 May 93

I 9

9

13 Jun 84

Deactivated 28 Feb 94

I 10

10

12

08 Sep 84

Operational

I 11

11

09 Oct 85

Deactivated 14 Apr 94

The first Control Segment consisted of a control station, ground antenna, and monitor station

located at Vandenberg AFB in California, supported by additional monitor stations located at

Elmendorf AFB in Alaska, Anderson AFB in Guam, and the Naval Communications Station in

Hawaii.  This Phase I Control Segment was designated the Initial Control System (ICS).

The first user equipment (UE) testing began at Yuma Proving Ground (YPG) in March 1977

using ground transmitters to simulate the GPS satellites.  As the Block I satellites were launched,

a combination of satellites and ground transmitters were used for testing until December 1978,

when four satellites were available to provide limited 3 D navigation capability.  Shipborne UE

was tested off the coast of California starting in October 1978 when three GPS satellites were

available for two dimensional (2

 D) navigation.

1.6.3  Phase II   Full Scale Development (1979 1985)

In September 1980, a contract was awarded to upgrade and operate the ICS, as well as develop

an Operational Control System (OCS).  The ICS upgrades ensured continued support to the UE

test team while the OCS was being developed.  OCS equipment was delivered to Vandenberg

AFB in May 1985.  In October 1985, after installation and initial testing, the OCS conducted

dual operations with the ICS.  The OCS equipment was moved from Vandenberg to its permanent

site at Falcon AFB by the end of 1985.  In December 1980, the contractor was

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