Previous [ 1] [ 2] [ 3] [ 4] [ 5] [ 6] [ 7] [ 8] [ 9] [ 10] [ 11] [ 12]


Journal of Information Science and Engineering, Vol. 20 No. 5, pp. 959-980 (September 2004)

Target Components Discrimination using Adaptive
Time-Delay Neural Network*

Daw-Tung Lin
Department of Computer Science and Information Engineering
Chung Hua University
Hsinchu, 300 Taiwan

The feasibility of distinguishing multiple type components of exo-atmospheric targets is demonstrated by applying the Time Delay Neural Network (TDNN) and the Adaptive Time-Delay Neural Network (ATNN). Exo-atmospheric targets are especially difficult to distinguish using currently available techniques because all target parts follow the same spatial trajectory. Thus, classification must be based on light sensors that record signal over time. Results have demonstrated that the trained neural networks are able to successfully identify warheads from other missile parts on a variety of simulated scenarios, including differing angles, fragmented pieces and tumbling. The network with adaptive time delays (the ATNN) performs highly complex mapping on a limited set of training data and achieves better generalization to overall trends of situations compared to the TDNN. We also apply the theorem of Funahashi, Hornik et al and Stone-Weier- strass to state the general function approximation ability of the ATNN. The network is trained on additive noisy data and shows that it possesses robustness to environment variations.

Keywords: automatic target recognition, target trajectories discrimination, time delay neural network, adaptive time-delay neural network, noise resilience

Full Text () Retrieve PDF document (200409_09.pdf)

Received October 22, 2002; revised February 6, 2003; accepted June 16, 2003.
Communicated by Chung-Yu Wu.
* This work was supported in part by the National Science Council, (Grand NSC-85-2213-E216-079), Taiwan, R.O.C., and the Applied Physics Laboratory of Johns Hopkins University. Acknowledgment also due to Dr. Judith E. Dayhoff for her invaluable discussions and comments.