A Brief Review of Adaptive Null Steering Techniques.
ROYAL SIGNALS AND RADAR ESTABLISHMENT MALVERN (ENGLAND)
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A brief theoretical review of adaptive null steering is presented. The basic theory is first outlined in the context of sidelobe cancellation systems as well as general antenna arrays. Various approaches to the practical implementation of adaptive null steering are then discussed. These fall into the two main categories of closed loop methods and direct solution methods. The closed loop methods are very cost-effective and suitable in principle, for either analogue or digital processing. However, their rate of convergence is fundamentally limited and too slow for some applications. The direct solution methods do not suffer from this problem but tend to be suitable only for digital processing and are more expensive from the computational point of view. However they are well suited to parallel processing and now provide a very practical alternative due to recent advances in VLSI circuit technology. A brief discussion on the effects of multi-path propagation on adaptive null steering systems concludes this review.
- Fluid Mechanics