Reaction control system of hypersonic vehicle and its moment parameter identification

As hypersonic flight vehicle flying at a high altitude where aerodynamic forces and moments are not enough for steady flight, reaction control system is widely used due to its effectiveness and agility. This paper describes two main approaches to studying the effect of reaction control system. The first approach is the method by measuring the pressure near the thrusters and then estimating the gas-jet interaction. The second one is the method by using moment system identification to identify the aerodynamic force caused by reaction control system. The second approach can be easily used without adding extra measurements. And identification method of the time parameters in the reaction control system is also discussed.