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The effects of acoustic beam directivity on the accuracy of acoustic Doppler current profiling are discussed. Traditionally, a transducer's main lobe is considered when analyzing Doppler profiler performance. However, excessively large secondary lobes dominate the overall transducer directivity near boundaries and limit profiler performance. Side-lobe suppression design is shown to improve the overall system directivity by almost 50%. Results of transducer directivity numerical modeling are in good agreement with laboratory calibrations. Practical implications of improved directivity for velocity profiling near boundaries are discussed.