NAVIOR-24S
™
CHAPTER II
Hardware Integration
42
NAVIOR-24S ™
Revision
V1.00 20.05.2008
GPS/GLONASS Antennas
The antenna receives the GPS/GLONASS satellite signals and passes them to the receiver. The
GPS/GLONASS signals are spread spectrum signals in the 1575 MHz (GPS) and
1598,06225…1609,3125 MHz (GLONASS) range and do not penetrate conductive or opaque
surfaces. Therefore, the antenna must be located outdoors with a clear view of the sky. The
NAVIOR-24S GPS/GLONASS receiver requires an active antenna. The received GPS/GLONASS
signals are approximately -134 dBm, at the surface of the earth (in typical environments). NAVIS's
active antennas include a preamplifier that filters and amplifies the GPS/GLONASS signals before
delivery to the receiver.
NAVIS offers several antennas for use with the NAVIOR-24S GPS/GLONASS receiver described
below and in Appendix E.
1. A Compact Magnetic-Mount GPS/GLONASS Antenna with a 5 m cable and TNC or SMA
connector. This antenna provides for a flexible, movable installation. The TNC or SMA output
connector mates to the MMCX connector on the NAVIOR-24S GPS module with an optional RF
transition cable.
Warning – When magnetic-mount or permanent-mount GPS/GLONASS antennas are
installed on a metal surface for prolonged periods, care must be taken to insulate the antennas
in order to prevent galvanic corrosion.
Figure II-3 - Compact Magnetic-Mount GPS/GLONASS Antenna
