No abstract

NavIC(Navigation with Indian Constellation) system formerly IRNSS (Indian Regional Navigation Satellite System), is an ISRO initiative to build an independent regional satellite navigation system based on seven satellite constellation to provide precise position, velocity and time to users over the Indian region. The NavIC System is designed to provide position accuracy 20 meters over Indian geo‐political boundary and a region extending to the about 1500 Kms around India for a dual frequency user. One of the important elements of ground segment which operates 24×7 unmanned is one‐way CDMA (Code Division Multiple Access) ranging station namely IRNSS Range and Integrity Monitoring Stations (RIMS). This paper provides the system engineering aspects and the challenges involved in engineering RIMS for NavIC. First an overview of RIMS technical design is provided. The architecture of one way IRIMS is explained based on functionality. Then the key techniques of designing IRIMS are described. Also basic technical considerations on the other IRIMS equipment's, like atomic clocks, reference receiver and computing infrastructure are provided. The major role of IRIMS inside NavIC System functions is analyzed. Towards establishment of such one way IRIM Stations the system engineering aspects such as, the site selections requirements, site survey requirements namely Radio Frequency (RF) Survey, Multipath survey, elevation profile survey are presented.