Analysis of the principle of velocity ambiguity eliminator used in early instrumentation radar has shown that the smoothing time required is too long. The optimum algorithm used as software in radar system is analysed and it is found possible to reduce the smoothing time. A new hardware design is developed which by use of approximate optimum algorithm has made the smoothing time approaching to the computing time in general computer by software. An improvement is made on hardware design for eliminating velocity ambiguity

in this case the time required is about a fourth as compared with the old designs.