NTS 2 [NRL]
The successful launch of NTS-2 (Navigation Technology Satellite) marked the beginning of a new era in navigation and timekeeping history. NTS-2 was launched on 23 June 1977 as the first NAVSTAR GPS Phase I satellite.
NTS-2 technological features included cesium frequency standards, a nickel-hydrogen battery, three-axis gravity-gradient stabilization with momentum-wheel unloading, control of the spacecraft orbit, laser retroreflectors, solar-cell experiments, radiation dosimeters, and a worldwide network for data acquisition. The satellite experiment has verified Einstein's relativistic clock shift.
|Type / Application:||Navigation|
|Operator:||US Air Force (USAF) STP (Space Test Program)|
|Contractors:||Naval Research Laboratory (NRL)|
|Power:||2 deployable solar arrays, batteries|
|Orbit:||19545 km × 20187 km × 63.28°|
|NTS 2 (P76-4) (ex Timation 4)||1977-053A||23.06.1977||Va SLC-3W||Atlas-F SGS-1|
Further STP missions: