Guidance Law Design for Terminal Area Energy Management of Reusable Launch Vehicle by Energy-to-Range Ratio

Abstract

A new guidance scheme that utilizes a trajectory planning algorithm by energy-to-range ratio has been developed under the circumstance of surplus energy for the terminal area energy management phase of a reusable launch vehicle. The trajectory planning scheme estimates the reference flight profile by piecing together several flight phases that are defined by a set of geometric parameters. Guidance commands are readily available once the best reference trajectory is determined. The trajectory planning algorithm based on energy-to-range ratio is able to quickly generate new reference profiles for testing cases with large variations in initial vehicle condition and energy. The designed flight track has only one turn heading, which simplifies the trajectory planning algorithm. The effectiveness of the trajectory planning algorithm is demonstrated by simulations, which shows that the guided vehicle is able to successfully dissipate energy and reach the desired approach and landing glideslope target with small tracking errors.

Auto-landing guidance for unmanned aerial vehicle with engine flame-out

“…From the geometry, altitude change dh can be obtained using equation (11). The differential equation in this case can be derived from equations (3), (10), and (11). It is expressed in equation (12) and the solution is in the same form as equation (7).…”

“…Jiang et al. 's study 10 presented the development of a guidance algorithm using trajectory planning based on energy-to-range ratio for RLVs. The characteristic of this algorithm is that the designed ground track of the acquisition phase has only one circular turn, so the trajectory planning procedure is simple and fast.…”

“…In many papers, [10][11][12][13][14][15] the trajectory generation algorithm with energy-to-range ratio has been studied for safe landing and precision bombing of a glider bomb. This method fundamentally manages the kinetic and potential energies.…”

Real-time online trajectory planning and guidance for terminal area energy management of unmanned aerial vehicle

“…Following [7], some trajectory planning and guidance strategies in the TAEM phase that do not need a predetermined reference trajectory, such as [8,9], have been developed. For quickly generating prediction trajectories, W. Jiang [10] proposed a guidance algorithm that is able to rapidly generate a feasible path using the energyto-range ratio. In [11], a new reference profile is quickly generated from its current state to a desired approach and landing target state using two geometric parameters.…”

“…In this paper, we proposed a trajectory planning and guidance strategy based on judging the energy, which generates a feasible and continuous path and guidance commands in real time. Different from prior works [10,12,14], the algorithm proposed in our work considers not only the initial energy variation but also the energy variation of the flight process. An example of such an energy variation is wind disturbances (for example, downwind and headwind disturbances).…”