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Guidance law to control impact time constraining the seeker’s field of view?

Jian Hu (Harbin Institute of Technology, Harbin, China)
Naigang Cui (Department of Space Engineering, Harbin Institute of Technology, Harbin, China)
Yuliang Bai (School of Astronautics, Harbin Institute of Technology, Harbin, China)
Yunhai Geng (Research Center of Satellite Technology, Harbin Institute of Technology, Harbin, China)

Aircraft Engineering and Aerospace Technology

ISSN: 0002-2667

Article publication date: 27 September 2018

Issue publication date: 30 January 2019



The purpose of this paper is to present a novel guidance law that is able to control the impact time while the seeker’s field of view (FOV) is constrained.


The new guidance law is derived from the framework of Lyapunov stability theory to ensure interception at the desired impact time. A time-varying guidance gain scheme is proposed based on the analysis of the convergence time of impact time error, where finite-time stability theory is used. The circular trajectory assumption is adopted for the derivation of accurate analytical estimation of time-to-go. The seeker’s FOV constraint, along with missile acceleration constraint, is considered during guidance law design, and a switching strategy to satisfy it is designed.


The proposed guidance law can drive missile to intercept stationary target at the desired impact time, as well as satisfies seeker’s FOV and missile acceleration constraints during engagement. Simulation results show that the proposed guidance law could provide robustness against different engagement scenarios and autopilot lag.

Practical implications

The presented guidance law lays a foundation for using cooperative strategies, such as simultaneous attack.


This paper presents further study on the impact time control problem considering the seeker’s FOV constraint, which conforms better to reality.



Hu, J., Cui, N., Bai, Y. and Geng, Y. (2020), "Guidance law to control impact time constraining the seeker’s field of view?", Aircraft Engineering and Aerospace Technology, Vol. 91 No. 1, pp. 20-29.



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