Journal of Astronautics ›› 2012, Vol. 33 ›› Issue (4): 451-459.doi: 10.3873/j.issn.1000-1328.2012.04.006

• E&IE • Previous Articles     Next Articles

Joint Parameter Estimation of the Target and Decoy within the Radar Beam Based on Improved MCMC

SONG Zhi-yong, XIAO Huai-tie, ZHU Yi-long, LU Zai-qi   

  1. ATR Key Laboratory, National University of Defense Technology, Changsha 410073, China
  • Received:2011-08-17 Revised:2011-12-01 Online:2012-04-15 Published:2012-05-02

Abstract: The parameter estimation of the target and towed radar active decoy (TRAD) within the radar beam is the necessary condition for radar seeker to realize target selection and achieve the boresight steering adjust and accurate tracking. The “closely spaced” target and decoy make radar echoes aliased and the traditional method for parameter measurement and estimation fail. Based on the signal model, that the energy of single target will spill over to adjacent matched filter sampling points when the output of matched filter of radar seeker is sampled actually. Bayesian theory is adopted to obtain the posterior probability density function of estimated parameters from the conditional likelihood function of the observation and the prior distribution of unknown parameters in this paper. Then the Metropolis-Hastings (M-H) sampling algorithm belonged to Markov Chain Monte Carlo (MCMC) is utilized to estimate parameters of target and decoy jointly. At the same time, based on the jamming model and characteristics of TRAD, the M-H sampling is improved. The simulation results under different jamming conditions and dynamic attack scenarios illustrate the performance of proposed method.

Key words: Electronic countermeasures, Towed radar active decoy(TDAD), Joint parameter estimation, Markov Chain Monte Carlo(MCMC), Metropolis-Hastings sampling