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PAYLOAD FAIRING GSLV heatshield is made of aluminium alloy and is 3.4 m dia and 7.8 m long consisting of 2 halves. It protects the spacecraft from hostile flight environment during ascent phase.
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STAGE SEPARATION SYSTEMS The vehicle is provided with various separation systems such as Flexible Linear Shaped Charge (FLSC) for first stage (GS1), pyro actuated collet release mechanism for second stage (GS2) and merman band bolt cutter separation mechanism for third stage(GS3). GS1 is separated using hot gas separation with vented interstage. The separation is effected through the GS2 exhaust gases impinging on the S125 dome and the acceleration provided by the GS2. GS2-GS3 separation is by four retro rockets mounted on GS2. GS3- spacecraft separation is by spring thrusters mounted at the separation interface.
INERTIAL NAVIGATION AND GUIDANCE The three-axis attitude stabilization of the vehicle is achieved by autonomous control systems provided in each stage. Single plane Engine Gimbal Control (EGC) of the four strapons of the first stage are used for pitch, yaw and roll control. The core motor of the first stage (S125) is provided with Secondary Injection Thrust Vector Control (SITVC) to augment the pitch and yaw control. The second stage has Engine Gimbal Control (EGC) for pitch and yaw and hot gas Reaction Control System (RCS) for roll. For the third stage, two swivellable auxiliary engines, using LH2 and LOX, provide pitch, yaw and roll control during thrusting phase and cold gas system during coast phase. The Inertial Guidance System (IGS) in the Equipment Bay (EB) housed above the third stage guides the vehicle till spacecraft injection. The closed loop guidance scheme resident in the on-board computer ensures the required accuracy in the injection conditions. Strapon Integration |