Journal of Astronautics ›› 2014, Vol. 35 ›› Issue (5): 554-563.doi: 10.3873/j.issn.1000-1328.2014.05.009

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Stability Region Analysis of the Parasitical Loop and Guidance Accuracy Analysis of the Semi-Strapdown Homing Seeker

SONG Jian mei,  CAI Gao hua   

  1. Key Laboratory of Dynamics and Control of Flight Vehicle, Ministry of Education,School of Aerospace Engineering, Beijing Institute of Technology, Beijing 100081, China
  • Received:2013-04-01 Revised:2013-09-03 Online:2014-05-15 Published:2014-05-25


The stability of the parasitical loop of the Semi Strapdown Homing Seeker (SSHS) is analyzed, and the influence of main system parameters and random noises on the guidance accuracy of Semi\|Strapdown Homing Guided (SSHG) system are studied in this paper. First, the control system of the SSHS is designed, the mathematical model of the Disturbance Rejection Effect (DRE) and the mathematical model of the parasitical loop induced by the DRE are built. Based on the Routh Criterion, the approximate stability region of the parasitical loop is calculated out, the conditions that ensure the stability of the parasitical loop are directly related to the seeker main controller parameters. Then, by using the simplified model of the SSHG system, the explicit analytic expressions of miss distance and missile acceleration induced by target maneuvering and measurement errors are derived based on the adjoint technique. Finally, the influence of the main system parameters and sensor measurement errors on the guidance accuracy of the realistic complex SSHG system are analyzed, which provide a foundation for system design and engineering implementation of SSHG system.

Key words: Semi strapdown homing seeker (SSHS), Disturbance rejection effect (DRE), Parasitical loop, Stability region, Guidance accuracy analysis, Adjoint technique

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