Multiple Frequency Side-Scan Sonar

The invention relates to hydroacoustic equipment and can be used in constructing hydroacoustic systems. Multifrequency sonar side viewer comprising display unit, control unit, n-input adder, connected in series radio-frequency pulse generator, switch, multielement transceiving interference antenna, differs because of antenna aperture is made as cylinder-shaped bay, convex towards echo search, with radius of curvature R, that has generatrix l in azimuth plane and that is way longer than a chord, that draws together uttermost symmetric, relatively to the acoustic axe, points of arc with L length. The invention expands operational capabilities of sonar side viewer, reducing dead zone and increasing dimension of explored bottom surface swath in echo search direction, due to the using of non-linear self-action soundwaves effect.