Orbital Minotaur VI - Manual (Page 101)

Minotaur IV • V • VI User’s Guide Section 8.0 – Optional Enhanced Capabilities
management, scheduling, satellite usage, ground
operations, and data processing.
8.9. Increased Insertion Accuracy
Enhanced insertion accuracy can be provided
through the use of a Hydrazine Auxiliary
Propulsion System (HAPS), shown in Figure
8.9-1. 6DOF analyses show the HAPS system
provides a controlled impulse to achieve the
accuracies shown in Table 8.9-1 (Insertion is for
both apse and non-apse).
The HAPS propulsion system consists of a
centrally mounted tank containing approximately
100 lbm of hydrazine and three fixed axial
thrusters. The hydrazine tank contains an integral
propellant management device which supports
several zero gravity restarts. The system is
integrated inside of a dedicated HAPS stage
avionics structure that separates from the GCA.
After final stage burnout and separation from the
GCA, the HAPS hydrazine thrusters provide
additional velocity for improved performance and
precise orbit insertion. Alternatively, the system
can be modified as a nonstandard enhancement
to allow for integration into the existing GCA for
increased vehicle accuracy without reducing
payload volume within the fairing.
Figure 8.9-1. Hydrazine Auxiliary Propulsion System (HAPS) Used to Provide Insertion Accuracy
Figure 8.8-2. TDRSS Notional Telemetry Flow
Table 8.9-1. Enhanced Insertion Accuracy
Error Type Tolerance
Insertion <18.5 km (10 nmi) (3-
σ)
Inclination <0.05° (3-
σ)
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