A novel method for non-stationary target detection and direction finding with broad-beam high-frequency(HF) radars based on time-frequency analysis is proposed.Target ridges on the time-frequency representation (TFR) of the echo data are detected

and then array snapshots are formed by sampling the TFR along the ridges

which are finally used to calculate the spatial spectra.Furthermore

the effects on target direction finding due to the cross-range motion of the target are analyzed

and a motion-compensation method is developed

which can effectively estimate the time-variant direction as well as the cross-range velocity of the target.Radar echo signal processing results show the validness of the above methods for the detection and direction finding of non-stationary targets with broad-beam HF radars.