© 2017 Jackson Labs Technologies, Inc.
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RSR GNSS Transcoder™ User Manual
Setup and
Configuration
Instructions
3.1 Introduction
The RSR GNSS Transcoder™ is a miniature real-time full-constellation GPS simulator. It is
designed to receive inputs from an external PVT/PNT source such as a GNSS receiver via an RS-232
serial port, and to connect to a legacy GPS receiver via the GPS L1 RF output, allowing transcoding
of any GNSS system into GPS. The RSR GNSS Transcoder™ includes special embedded design
features such as a PCB outline that allows direct mating to a Rockwell Collins RSR Puck SAASM
receiver. The unit can also be used with many other industry-standard GNSS receivers, or as a
stand-alone general-purpose GPS simulator under user-control. The RSR GNSS Transcoder™ at its
heart is a full-constellation, real-time, 10-channel GPS simulator, and may also be used as a simple
small SWaP-C high-quality GPS simulator for R&D, manufacuring, or in-field testing rather than in
a dedicated GNSS-transcoding type of application.
The RF output of the RSR GNSS Transcoder™ simulates the GPS signals that would normally be
present in a Live-Sky GPS antenna feed. The RSR GNSS Transcoder™ includes a USB port that can
provide power to the unit (alternatively a DC power source of 7V to 36V with 12V nominal can also
be used). The USB port is used as a control/monitoring serial port using the GPSCon application
software (available on the support page under www.jackson-labs.com) or using standard terminal
programs such as TeraTermPro. A dedicated JLT Windows application program will be made
available at no cost in late 2017.
Once powered, the RSR GNSS Transcoder™ will generate a GPS L1 C/A RF output signal that is
compatible with legacy GPS receivers. The unit will either output a fixed position stored in memory,
or it will output a position equal to the NMEA input position on the RS-232 serial input port. This
transcoding from NMEA RS-232 base-band PVT signals into GPS RF signals allows the use of any
external GNSS receiver source such as SAASM, M-Code, Glonass, Galileo, or BeiDou receivers, or
even positioning sources such as INS modules etc, and for these sources to be transcoded in real-time
into legacy GPS RF signals. The RF output of the RSR GNSS Transcoder™ is attenuated to about
-120dBm per satellite which results in typical Carrier to Noise (C/No) values of 42dB to 47dB on
Summary of Contents for RSR GNSS Transcoder
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