MTI-filters using serial analogue memories

An attempt was made to extend the attainable dynamic range of the filters for a given signal resolution by suitable modification of the transfer function, by splitting into subsystems and by suitably combining the subsystems with each other. By limiting the costly arithmetic units to the absolutely necessary, an endeavour was made to arrive at solutions with the minimum number of components, with low dissipations and maximum circuit transparency. By using recently developed technologies, attempts were made to obtain solutions requiring less space and less power with simultaneously increased filter operating speed. In this context, it was possible to increase the speed of A/D converters, which represent the weakest link in a digital MTI filter, and favorable solutions were found for the design of multipliers in the filter sections.