Chapter 1 introduction
Turn on: Housecleaning tasks necessary before starting the state machine. Evaluate Power up
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- Armed
- Boost
- Descend Main
- Launch complex facilities
Turn on: Housecleaning tasks necessary before starting the state machine. Evaluate Power up: Check for a reboot in flight Initialize: Get all nodes in a known and safe state. Idle: Low power mode for waiting on pad or for debugging Preflight Check: Turn on and test all subsystems. Ready: All systems are go; waiting for count down Armed: Nodes ready for flight; waiting for launch _ Rocket Ready: Turn on the launch interlock relay and wait for launch detect. Launch Abort: The launch has been aborted, but it may be too late; wait in case the main motor has ignited. Boost: GPS/Altimeter/Umbilical vote implies motor has started. Coast: Motor has burnt out and the rocket is coasting Deploy Drogue: Apogee has been reached; deploy the drogue parachute. Descend Drogue: The drogue is deployed and the rocket is descending (fast). Deploy Main: Near ground; fire the line cutters to release the main parachute. Descend Main: Main chutes deployed and the rocket is descending (slowly). Recovery Wait: Rocket on ground; waiting for recovery teams to pick it up. Recovery Sleep: Low power waiting mode. Power down: Power the rocket down. Software design tools: ISRO has developed a number of versatile software design tools such as design of trajectory, design and analysis of structures, analysis of orbital missions, thermal design, simulation of integrated 6-degrees-of-freedom trajectory, vehicle flexibility, slosh motion and nonlinear actuator dynamics, design and analysis of solid, liquid and cryo propulsion systems and so on. Launch complex facilities ISRO has established launch complex at the Satish Dhawan Space Center (SDSC) to cater to the launching of a variety of launch vehicles at increasing frequency. Mobile Service Tower (MST) and umbilical tower of the First Launch Pad (FLP) permit vertical assembly of a vehicle at launch pad. The FLP shown in Figure 13 can handle both PSLV and GSLV. Facility at FLP comprises launch pedestal, MST and an Umbilical Tower (UT). The tower houses all the fluid lines for propulsion stage servicing. MST is an 85 m tall building fabricated out of structural steel weighing 2500 t provides environmental protection and access to launch vehicle during integration, checks and servicing. After completion of vehicle build-up, checks, propellant filling activities, the MST is moved back during launch. 
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