Jackson Labs Micro-JLT GNSS, User Manual

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© 2019 Jackson Labs Technologies, Inc. 1
Micro-JLT GNSS™ User Manual
Introduction
1.1 Overview
The Micro-JLT GNSS™ board is the latest generation GNSDO™ product from Jackson Labs
Technologies, Inc. and is based on the popular Mini-JLT GPSDO product line. As an example,
Figure 1.1 displays an image of a single oven OCXO option for the Micro-JLT GNSS™. The
Micro-JLT GNSS™ supports three-concurrent multi-GNSS tracking by using a latest generation
concurrent GPS/Glonass/Galileo/BeiDou/QZSS/SBAS capable fixed-position GNSS timing
receiver, as well as optimizes phase noise performance, power supply consumption, cost, and
lead-time, while adding differential interfacing for robustness in adverse environmental conditions.
For the purposes of this discussion the word GNSDO is used interchangeably with GPSDO. The
board is designed for long life-time, high volume production with the industries’ lowest price point
in its class. The Micro-JLT GNSS™ is designed for fast warm-up with optimum stability with
excellent ADEV and Phase Noise performance for high-volume, low-cost applications that can
encounter the harshest environments.
The Micro-JLT GNSS™ GNSDO uses a multi-GNSS receiver that can run in stationary (Position
Hold) mode as well as 3D mobile mode to discipline either a single oven or optional double oven
OCXO local oscillator to better than 0.1ppb frequency accuracy typically. It supplies one 10MHz
output with ultra-low phase-noise, exceptional ADEV performance, and very low spurs and
harmonics. The board includes an RS-422/TTL control port for NMEA and SCPI communication,
and an LVDS 1PPS timing output driven by the on-board ultra-low-jitter holdover oscillator. The
board operates from a 5.5V nominal supply with 5.2V to 6.0V range (a 5.0V +/-0.2V
operating range can be optionally ordered), and has connector pins to indicate GNSS and oscillator
LOCK and ALARM events. The board includes a high-performance GNSS receiver that can acquire
and track up to 72 GNSS signals down to a state of the art –167dBm (GPS and GLONASS), a
latest-generation low-power 32-bit processor that runs a Real Time OS, one 10MHz +8.5dBm Sine
Wave output, 1PPS UTC synchronized LVDS output, RS-422/TTL serial control interface, and
precision voltage references and DACs. The board also includes the latest generation multi-level
power supply management and conditioning for low power-consumption and extremely high
power-supply noise and stability rejection ratios. The Micro-JLT GNSS™ builds upon the legacy of
Jackson Labs Technologies, Inc. tens’ of thousands of fielded GPSDO units.