Design Of RF Down Converter For IRNSS User Receiver
This paper demonstrates the design of RF front end down converter for IRNSS user receiver. Here the
IRNSS frequency L5 (1176.45 MHz), S1 (2492.028 MHz) and GPS (1575.42 MHz) are down converted to a
common Intermediate frequency (IF) 72.221 MHz. The Down Converter proposed here is interfaced between the
antenna and Base Band Card, for down converting and pre-conditioning the Radio-Frequency signal. A prototype
of the design is successfully used in finding the user position with an accuracy of 0.5 meter.
Index Terms— Indian Regional Navigation Satellite System (IRNSS), Radio Frequency (RF), Down Converter
(DC) and Intermediate Frequency (IF).