IMEWS (DSP1)
Integrated Missile Early Warning Satellites
Part of the DSP (Defence Support Program) program
IMEWS was the first generation DSP satellite.
Spacecraft
Spacecraft spin slowly (6 rpm) about the nadir axis to permit scanning of the Earth by the detector system. Body mounted and deployable panels provide 400W.
Payload
Payload information is not available.
| Country of Origin | United States |
| Customer/User | USAF |
| Manufacturer(s) | TRW |
| Orbit | Geosynchronous (F1 in lower than planned orbit) |
| Design Life | 3 years |
Launch Facts
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| Name | Int'l Desig. | Date | Site | Vehicle | Orbit | Mass(kg) |
| Notes | ||||||
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| IMEWS 1 (DSP F1) | 1970-093A | 11/6/70 | ESMC | Titan 3C | HEO | 820 |
| 1st generation DSP; incorrect orbit | ||||||
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| IMEWS 2 (DSP F2) | 1971-039A | 5/5/71 | ESMC | Titan 3C | GEO | 820 |
| 1st generation DSP | ||||||
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| IMEWS 3 (DSP F3) | 1972-010A | 3/1/72 | ESMC | Titan 3C | GEO | 820 |
| 1st generation DSP | ||||||
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| IMEWS 4 (DSP F4) | 1973-040A | 6/12/73 | ESMC | Titan 3C | GEO | 820 |
| 1st generation DSP | ||||||
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| IMEWS 5 (DSP F5) | 1975-118A | 12/14/75 | ESMC | Titan 3C | GEO | 820 |
| 1st generation DSP | ||||||
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