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| FedSat 1 |
Dec 2002 |
- First hardware reconfigurable computer flown in space
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| CONTOUR |
3 Jul 2002 |
- First operational use of non-coherent doppler tracking
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| TIMED |
7 Dec 2001 |
- First demonstration of non-coherent doppler tracking technique
- First analog-digital-RF Integrated Electronics Module
- First routine use of "lights out" Mission Operations
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| ACE |
25 Aug 1997 |
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| MSX |
24 Apr 1996 |
- First hyperspectral sensor in space
- Closed-loop spacecraft pointing at targets
- First real-time tracking of satellites from space
- First space-based sensor integrated into national Space Surveillance Network
- First use of solid hydrogen cryogen in space
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| NEAR |
17 Feb 1996 |
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| NEAR |
May 1994 |
- First issuance of AO electronically (Internet)
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| --- |
1989 |
- First real-time closed-loop tracking of a missile launch from space
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| Delta-180 |
5 Sept 1986 |
- First space intercept of an accelerating target
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| Geosat-A |
12 Mar 1985 |
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| Landsat-D |
16 Jul 1982 |
- Autonomous satellite navigation by tracking GPS (GPSPAC R/PA)
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| Magsat |
30 Oct 1979 |
- First attitude and command systems using microprocessors
- "Aerotrim" boom to counter aerotorques in LEO
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| Seasat SAR Downlink |
27 Jun 1978 |
- Quadrifilar helix antenna with beam shaping to compensate for slant range
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| Seasat Altimeter |
27 Jun 1978 |
- First microprocessor system in space
|
| 1977 56A |
27 Jun 1977 |
- Satellite-to-satellite tracking by doppler signals (NAVPAC)
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| TIP-II |
12 Oct 1975 |
- Crystal oscillator with all drift removed by programmable synthesizer
- First use of pulsed plasma micro-thrusters in space
- World-wide time synchronization to 40 ns from a single satellite
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| SAS-C |
7 May 1975 |
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| GEOS-C |
9 Apr 1975 |
- First satellite-to-satellite tracking
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| Triad |
2 Sept 1972 |
- First satellite compensated for drag and radiation pressure
- Single-frequency refraction-free satellite navigation
- Quadrifilar helix antenna
- First flex cable packaging in space
- First scissors boom in space
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| SAS-A |
12 Dec 1970 |
- Dual-spin control of satellite pointing
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| GEOS-B |
11 Jan 1968 |
- Heat pipes for spacecraft thermal design
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| DODGE |
1 Jul 1967 |
- First yaw stabilization of a satellite using pitch axis wheel
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| DME-A |
29 Nov 1965 |
- Magnetic spin/despin system
|
| GEOS-A |
6 Nov 1965 |
- First integrated circuits used in space
- First heat pipes in spacecraft
|
| Transit 5A-3 |
16 Jun 1963 |
- Gravity gradient stabilization
- Automatic temperature control of spacecraft
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| ANNA-1B |
31 Oct 1962 |
- Sublimation switches
- First gallium arsenide solar cell experiment
|
| Transit 5A-1 |
19 Dec 1962 |
- First uplink authentication system
|
| TRAAC Transit 4-B |
15 Nov 1961 |
- Damping of satellite libration by lossy spring-and-mass
- Spacecraft spin imparted by solar pressure vanes
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| Transit 4-A |
29 Jun 1961 |
- First nuclear power supply in a spacecraft
- First triple satellite launch
|
| Transit 3-B |
21 Feb 1961 |
- First Satellite electronic memory
|
| Transit 2-A |
22 Jun 1960 |
- First dual payload launch
|
| Transit 1-B |
13 Apr 1960 |
- Two-frequency method for correcting ionospheric error
- First attitude-controlled spacecraft, using permanent magnets
- Solar attitude detectors
- Hysteresis damping of satellite libration
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| Transit 1-A |
17 Sept 1959 |
|
| --- |
1958 |
- Development of satellite Doppler navigation system
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| Sputnik-1 |
4 Oct 1957 |
- Satellite tracking by Doppler
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