Abstract
A scaling instantaneous frequency measurement (IFM) method inspired by hawk's eye is proposed, by which the frequency measurement precision can be improved to 5–10 times comparing to conventional digital IFM method. The hawk's eye has nasal fovea and temporal fovea. The nasal fovea searches out preys in large scale, and then, the temporal fovea acquires preys' detail by shrinking the scale. Similar to the hawk's eye, the proposed method measures the instantaneous frequency in a large scale first; then, shrinks the scale and measures the frequency in small scale to obtain high precision. A microwave scaling IFM system was developed to evaluate the method. The theory simulation and experimental results prove its high precision. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:1383–1385, 2015
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