To overcome the common shortcomings shared by the existing methods: weak suppression noise interference and feeble performance of time-frequency concentration. a novel time-frequency analysis method based on sparse repre-sentation was developed. which could get clear and concentrate time-frequency representation. Firstly. https://www.bekindtopets.com/mega-price-Fit-Flight-Air-Dart-Flights-Pear-Green-flash-find/