Guidance and Control for Flat-Circular Parachutes

Autor: Glen Brown, Scott Dellicker, Richard Benney
Rok vydání: 2001
Předmět:
Zdroj: Journal of Aircraft. 38:809-817
ISSN: 1533-3868
0021-8669
DOI: 10.2514/2.2865
Popis: The Affordable Guided Airdrop System (AGAS) is being evaluated as a low-cost alternative for meeting the military’ s requirements for precision airdrop. Designed to bridge the gap between relatively expensive high-glide ratio parafoil systems and uncontrolled ballistic parachutes, the AGAS concept offers the benee ts of high-altitude parachute releases as well as the potential for highly accurate point-of-use delivery of material. The design goal of the AGAS development is to provide a guidance, navigation, and control system that can be placed in line with cargo parachute systems, for example the G-12 e at-circular parachute, and standard delivery containers (A-22) without modifying these e elded systems. The AGAS is required to provide an accuracy of 328 ft (100 m), circular error probable (CEP), with a desired goal of 164 ft (50 m) CEP. The feasibility of this concept was investigated through modeling and simulation. A three-degree-of-freedom (3DOF) point mass e ight dynamics model, sensor models of a commercial global positioning system (GPS) receiver and magnetic compass, and a model of the control and actuator system were incorporated into a Monte Carlo simulation tool. A bang-bang controller was implemented with trajectory tracking algorithms using position and heading information. Flight testing, using a radio-controlled scaled prototype, provided parachutedynamic and control response data to support themodeling efforts.Thestudy demonstrated thatthisconcepthas thepotential to providecontrolofpreviously unguided round parachutes to accuracies of approximately 210 ft (64 m) CEP. The program is now continuing into the next phase to include the development of a full-scale prototype system for payloads up to 2200 lb (1000 kg).
Databáze: OpenAIRE
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