Clutter Suppression in Radars by an Application of Digital Filters to MTI Systems

摘要

A significant part of radar technology has been concerned with developing techniques which permit satisfactory operation of radar systems when moving targets are in the presence of relatively fixed targets (clutter). This thesis presents the significant aspects of old, improved and modern anticlutter techniques, each of which is described with its principal advantages and disadvantages. A tabulation is made which compares each anticlutter technique on the basis of its clutter suppression capability. Continuing, an application of digital filters is made by designing a fourth-order recursive filter with Butterworth characteristics, using a computer program. This filter can be used in a range-gated MTI (Moving Target Indication) receiver to improve its performance. Special consideration was given to the AN/UPS-1 and AN/SPS-40B,C radars which are used in the Greek Navy in a clutter environment characteristic of the Mediterranean Sea. Appropriate modifications to their existing analog systems are suggested. (Author)