Performance Evaluation For Array Configurations By Adaptive Interference Suppression And Direction Of Arrival Estimation

With respect to different array configurations, the performances of adaptive interference suppression and direction of arival (DOA) estimation will be different, the relationship between their performances with the array configurations is presented and the performance evaluation based on familiar plane array configurations is achieved in the thesis. Firstly, the performance evaluation of adaptive interference suppression is studied. The output-signal-to-interference-plus-noise-ratio (OSINR) is usually presented to weigh the performances of adaptive interference suppression, and the spatial correlation coefficient is relative to the array configurations. Then the mathematical relationship is derived, namely OSINR is a decreasing function of the square of the spatial correlation coefficient. So the evaluation can be simplified by adopting the spatial correlation coefficient instead of the OSINR. Based on the criteria of the beaming width and the integrated sidelobe level, a method for the evaluation of the spatial correlation coefficient is proposed. And the conclusion is derived that the performance of the circular array is better than the others according to the criteria. Secondly, the effects of the array configurations on the performance of DOA is developed. Exploiting the sum and difference patterns method for DOA estimation, the comparison of the angular curve and the accuracy of DOA estimation between different array configurations is presented. Then the conclusion is drawn that the circular array has the better performances on the accuracy of DOA estimation. Lastly, combinied with the practical program, the hardware modules is achieved by the digital signal processor (DSP). Simulation results of the real measured data verify the performance of DOA estimation with respect to different array configurations, via the sum and difference patterns method.