Order tracking based on Gabor and Viterbi algorithm

The study proposes an improved Gabor order tracking technique based on Viterbi algorithm (V_GOT) to cope with close orders and crossing orders that cannot be effectively separated by using the original Gabor order tracking scheme. The dual function of the Gabor elementary function can effect the precision of tracked orders. In the paper, its influence on the computed Gabor expansion coefficients is investigated. For applying V_GOT in practical works, the separation and extraction of close orders components of vibration signals measured from an aircraft engine test is illustrated.