Guidance to Control Arrival Angle and Altitude for An Unpowered Aerial Vehicle
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ORIGINAL PAPER
Guidance to Control Arrival Angle and Altitude for An Unpowered Aerial Vehicle Seunghan Lim1
· Sungbong Cho1 · Eunyong Lee1
Received: 6 November 2019 / Revised: 11 February 2020 / Accepted: 26 February 2020 © The Korean Society for Aeronautical & Space Sciences 2020
Abstract To increase the effectiveness of a glide-bomb attack, it must be able to control the direction in which it strikes the target. Since glide bombs have different characteristics from missiles, it would not be suitable to attack at the high speed; so, it is not appropriate to use the guidance laws for the typical missiles directly. While there are many similarities with TAEM guidance for re-entry vehicle, implementation on glide bombs can degrade the performance. This paper takes into consideration the characteristics of glide bomb well and proposes a robust and straightforward guidance scheme, which is also proper for an unpowered aerial vehicle. This scheme guides the vehicle to reach the ‘target window’ controlling in the desired direction with adequate potential and kinetic energy, even in strong winds. At the end of this paper, the flight tests prove the practicality of this approach. Keywords Vector field guidance · Terminal area energy management (TAEM) · Approach and landing interface (ALI) · Arrival angle control · Impact angle control · Glide bomb · Unpowered aerial vehicle · Re-entry vehicle · Reusable launch vehicle (RLV)
1 Introduction Glide bombs can be useful in battlegrounds. Glide bombs are effective at attacking less maneuverable targets. Because they have little or no propellant compared to missiles. But they have the advantage of increasing explosive power by increasing warhead capacity. Hence, until recently, the development of advanced bombs is being carried out. The effectiveness of the glide bomb depends on which direction the bomb attacks the target. Therefore, controlling the arrival angle (the angle defined in the horizontal plane) and the impact angle (the angle defined in the vertical plane) is critical to increase the effectiveness of glide bombs. In general, glide bombs often have a wing with asymmetric airfoil to enlarge range; therefore, they would have asymmetrical dynamic characteristics unlike other guided weapons such as air-to-air missiles. Therefore, there is a precise requirement about the entry conditions of the terminal phase (the same as the terminal conditions of the midcourse phase such as
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Seunghan Lim [email protected]
arrival angle and arrival altitude) to control arrival angle and impact angle well at the last stage, since the flight envelope where they could track the guidance command expeditiously and stably is much narrower than other guided weapons. Guidance problems are the primary area of the homing missiles for a long time. Not only the requirement for miss distance but also the requirement for impact angle and time control becomes an essential part as the missile systems evolve. Therefore, many researchers have suggested the various guidance laws for the impact angle
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