Target tracking using television-based bistatic radar
The use of a non-co-operative television transmitter as the illuminator for a bistatic radar system is investigated. A signal processing scheme is developed that allows airborne targets to be detected and tracked using only the vision or sound carrier of the television broadcast. This scheme requires no synchronisation with the television transmitter, and uses the Doppler shift and bearing of target echoes to estimate the target's track. The signal processing scheme consists of a two-channel fast Fourier transform, to determine the Doppler and phase characteristics of the received signal, followed by time and frequency acting constant false alarm rate detection schemes to detect the target echoes. These echoes are corrected for phase errors arising from antenna element mutual coupling, and the corresponding bearings are calculated. A Kalman filter based tracking scheme is used to associate the individual Doppler and bearing returns belonging to different targets, resulting in Doppler and bearing profiles for each target. These are used to estimate the Cartesian co-ordinates and velocity of each target using an extended Kalman filter, initialised using a genetic algorithm and Levenberg–Marquardt optimiser. It is shown that targets can be detected and tracked over a large area, at ranges of up to 260 km.
- N. WILLIS . (1991) , Bistatic radar.
- M.R.B. DUNSMORE , G. GALATI . (1993) Advanced radar techniques and systems, Bistatic radars.
- BURKE, G.J.: `Numerical electromagnetics code -NEC-4 method of moments, part I :Users manual', Technical Report UCRL-MA-109338, January 1992.
- HOWLAND, P.E.: `Television based bistatic radar', September 1997, PhD Thesis, School of Electronic and Electrical Engineering, University of Birmingham, UK.
- QUIGLEY, A.L.C., HOLMES, J.E.: `The development of algorithms for the formation and updating of tracks', ASWE working paper WP-XBC-7512, Technical Report, November 1975.
- HOWLAND, P.E.: `Passive tracking of airborne targets using only Doppler and DOA information', 1995/104IEE Colloquium on Algorithms for Target Tracking, May 1995, Savoy PlaceLondon, UK, p. 7/1–7/3.
- HOWLAND, P.E.: `A passive metric radar using a transmitter of opportunity', Int. Conf. on Radar, 1994, May 1994, Paris, France, p. 251–256.
- D.E. GOLDBERG . (1989) , Genetic algorithms in search, optimisation and machine learning.
- D. BEASLEY , D.R. BULL , R.R. MARTIN . An overview of genetic algorithms Part 1, fundamentals. Univ. Computing , 2 , 58 - 69
- D. BEASLEY , D.R. BULL , R.R. MARTIN . An overview of genetic algorithms Part 2, research topics. Univ. Computing , 4 , 170 - 181
- K. LEVENBERG . A method for the solution of certain nonlinear problems in least squares. Quart. Appl. Math. , 2 , 164 - 168
- D. Marquardt . An algorithm for least squares estimation of nonlinear parameters. SIAM J. Appl. Math. , 431 - 441
- FLETCHER, R.: `A modified Marquardt subroutine for non-linear least squares', Report AERE-R.6799, May 1971.