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Calibration errors are the dominant error source for direction nding (DF) from airborne platforms. Calibration of the array manifold is done with the wings in an unknown position. Wing movements during ight perturbs the array manifold from its calibrated value, causing errors in the direction nding. We present a direction nding algorithm that compensates for variations in wing exure. The algorithm relies on a physically motivated model that captures the gross behavior of the manifold perturbations. The model has been validated using experiments on a model aircraft in an anechoic chamber. The structure of the model can be exploited in estimation schemes such as weighted subspace tting, leading to improved DF accuracy. With correct model parameters the e ect of the manifold perturbation is, in fact, fully neutralized. The properties of the new scheme are demonstrated through analysis and simulation.

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MUSE is an integrated project of the 6 th framework European research program.

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