Design and Realization of Multi-Channel Digital Receivers for Active Phased Array Radar

摘要

Modern Active Phased array Radars consist of thousands of transmit receive (T/R) T/R elements which are controlled using distributed digital receiver architecture. Groups of radiating T/R elements are controlled simultaneously to steer the beam and the received echo is processed in digital domain to obtain complex digital video signals. The digital processing of the resultant signals offers great flexibility and accurate computation to form Digital Beam Forming (DBF). An effort has been made to bring the analog system and digital system together as demanded by the state of the art Active Phased Array Radars. This requirement has been achieved by using analog and digital circuits densely packed to form Multi-Channel Analog and Digital Receiver. A hybrid design involving Multi-Channel Analog and Digital receiver design as a single compact unit being realized for Active phased array radar has been brought out in this paper. In this paper, we are mainly considering the implementation of the multi-channel digital receiver. The multi-channel receiver will operates in various modes of operation. The calibration of each receiver will be critical for receive path as well as for transmit path. The main focus of this paper is on calibration, configuration and pattern measurement process of multi-channel receiver. The H/w designed in small size so that it can be fixed into a active phased array radar has been brought out in this paper.