The multichannel and high sampling frequency characters of forward looking sonar lead to numerous calculations for azimuth and distance information

which demands a high quality and speed for the original echo image display.A display algorithm of echo data is designed in the sight scope of forward looking sonar

which solved the problem of sonar original imaging quality

through analyzing the influence of coordinate conversion and pixel luminance filling methed on imaging quality.The bottle-neck of real-time display can be surmounted to a great extent.Using rich interface resources of DSP and EDMA dynamic-adjustment technology

a realtime display schemes for sonar original image is designed.Validity of the high quality realtime display scheme is verified by experiment in pool.