Integrated Apogee Boost Stage

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Integrated Apogee Boost Stage
IABS Illustration.png
Illustration of IABS carrying its payload, a DSCS III satellite, to geostationary orbit.
Manufacturer GE Astro Space
Country of origin United States
Used on Atlas II, Atlas IIA, Delta IV Medium
General characteristics
Height0.68 m
Diameter2.9 m
Gross mass1578 kg
Propellant mass1303 kg
Empty mass275 kg
Launch history
StatusRetired
Total launches10
Successes
stage only)
9
Failed1 (payload reached final orbit on its own)
First flightFeb 11, 1992
Last flightAug 29, 2003
Integrated Apogee Boost Stage
Powered by2 R-4D
Maximum thrust980 N
Specific impulse 312 s
Propellant NTO/MMH

The Integrated Apogee Boost Stage (IABS - alternately, Integrated Apogee Boost Subsystem) was an American rocket stage used for the launch of Defense Satellite Communications System III satellites to geostationary orbit when using a launch vehicle without an upper stage capable of delivering them there directly. [1] Earlier DSCS III satellites had launched on the Titan 34D (using the Transtage or Inertial Upper Stage) and Space Shuttle Atlantis (using the Inertial Upper Stage), which were capable of delivering them directly to geostationary orbit - as such, the satellites were not capable of moving from geostationary transfer orbit to geostationary orbit themselves. Because of this, launch of these satellites on the Atlas II and Delta IV families required an apogee kick stage - the IABS - to be added to the satellite. The IABS was developed by GE Astro Space, who also manufactured the DSCS III satellites it was designed for. [2]

Contents

Design

A DSCS III satellite is integrated onto the IABS, between the fairing halves of its Atlas II launch vehicle IABS Integration with DSCS III.png
A DSCS III satellite is integrated onto the IABS, between the fairing halves of its Atlas II launch vehicle

IABS consisted of a flat, disc-shaped stage powered by two pressure-fed R-4D rocket engines, fed from a ring of spherical composite-overwrapped pressure vessels containing nitrogen tetroxide and monomethylhydrazine propellants. [3] The stage was spin-stabilized, rotating at 20 rpm. [4] An onboard solar array around its ring-shaped exterior, separate from that of its payload satellite, allowed IABS to remain operational for up to 12 days, [5] granting flexibility in mission planning. IABS was originally intended to make two burns while delivering DSCS III satellites - however, fuel feed problems after the first burn of its first mission rendered the second burn impossible, requiring the payload to maneuver to its final orbit on its own using its reaction control system. On later flights, these two burns were combined, avoiding this problem. [6]

Flights

Flights of the Integrated Apogee Boost Stage
IABS DesignationDatePayloadLaunch VehicleLaunch SiteOutcome
IABS-01Feb 11, 1992 DSCS III B14 Atlas II LC 36A Partial Failure
IABS-02Jul 2, 1992DSCS III B12Atlas IILC 36ASuccess
IABS-03Jul 19, 1992DSCS III B9Atlas IILC 36ASuccess
IABS-04Nov 28, 1993DSCS III B10Atlas IILC 36ASuccess
IABS-05Jul 31, 1995DSCS III B7 Atlas IIA LC 36ASuccess
IABS-06Oct 25, 1997DSCS III B13Atlas IIALC 36ASuccess
IABS-09Jan 21, 2000DSCS III B8Atlas IIALC 36ASuccess
IABS-08Oct 20, 2000DSCS III B11Atlas IIALC 36ASuccess
IABS-10Mar 11, 2003DSCS III A3 Delta IV Medium LC 37B Success
IABS-07Aug 29, 2003DSCS III B6Delta IV MediumLC 37BSuccess

See also

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References

  1. "IABS". space.skyrocket.de. Retrieved 2021-12-13.
  2. "Bo Lewis".
  3. Beeson, Harold D.; Davis, Dennis D.; Ross, William L.; Tapphorn, Ralph M. (2002-01-01). NASA. "Composite Overwrapped Pressure Vessels: Database Extension Task 3.0 and Impact Damage Effects Control Task 8.0". NASA Sti/Recon Technical Report N. 03: 14821. Bibcode:2002STIN...0314821B.
  4. "DSCS IABS". milsatcom.tripod.com. Retrieved 2021-12-13.
  5. Magazines, Hearst (August 1992). Popular Mechanics. Hearst Magazines.
  6. "The Cape, Chapter 3, Section 8, ATLAS II/CENTAUR Missions". spp.fas.org. Retrieved 2021-12-13.