Dsp04c.tif (1323780 bytes)                      Dsp04lnc.tif (1167222 bytes)
    Figure 23: DSP Flight #4 (Phase I)                          Figure 24: Launch of DSP Flight #4

                                                                                                                  June 12, 1973

Phase II (3 Flights, 1975-1977) (11)

For the DSP program, the USAF is the full system integrator with four associate contractors responsible for building parts of the total system. Associate contractors responsible for manufacturing the DSP satellite include GenCorp Aerojet Electro-Systems (AES) of Azusa, California (responsible for the primary sensors), Sandia National Laboratories of Albuquerque, New Mexico (responsible for the nuclear detonation detection sensors), and TRW Space and Defense Division of Redondo Beach, California (who produces the spacecraft and also integrates the sensors onto the spacecraft). The associate contractor responsible for the ground segment is Lockheed, Federal Systems Division, Boulder, Colorado. The Aerospace Corporation, a Federally Funded Research and Development Center (FFRDC), provides general systems engineering and integration support to the USAF System Program Office.

The next block of DSP satellites was known as "Phase II." There were three satellites in this series, Flights 5 through 7, launched between 1975 and 1977. This main upgrade from the "Phase I" block of satellites provided increased on-orbit design lifetime from 1.25 to 2.0 years, increasing the weight of the Phase II from 2000 to 2300 pounds, and the solar panel output from 400 to 480 watts. This block used the same basic spacecraft, but other packages were added. The same basic sensor was still used (2000 PbS detectors) providing BTH coverage. An experimental Above-the-Horizon (ATH) array sensor was flown on Flight 6. Phase II satellites can be distinguished from Phase I satellites by the two electronic packages (located 180 degrees apart) on the rim of the satellite conical section. The prime launch vehicle was still the reliable Titan IIIC along with a Transtage. DSP SPDs during this time period included Brig. Gen. (later Maj. Gen.) Howard M. Estes (1974-1975), and Col. James E. McCormick (1975-1979). Figures 25 through 29 show Phase II satellites and launches.

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