VIAVI M12M Replacement Receiver 72-Channel GNSS Timing and Navigation Receiver

Drop-in 72-channel multi-GNSS replacement for Motorola/iLotus M12+ and M12M receivers, usable stand-alone over USB.

Form, Fit, Function Compatibility: Motorola/iLotus M12+, M12M Timing and Navigation receivers
Dimensions: 40 mm x 60 mm x 9 mm (1.575 x 2.362 x 0.35 inch)
Weight: 15 grams
Data/Power Header: 10 pins, 5 x 2 rows, 1.27 mm spacing (M12M compatible)

Datasheet

Overview

The VIAVI M12M Replacement Receiver is designed to be form, fit and function compatible with the legacy Motorola/iLotus M12+ and M12M timing and navigation receivers. It is based on an 8th-generation GNSS timing receiver and can be used either as a stand-alone GNSS receiver via its USB interfaces or as a plug-and-play upgrade receiver for legacy equipment.

Replacing the legacy receiver improves positioning and timing performance, cold-start and capture time, tracking sensitivity and noise immunity, including multipath and jamming immunity. The receiver supports GPS, SBAS (WAAS/EGNOS/MSAS/GAGAN), Glonass, QZSS and BeiDou, with any two GNSS systems received at the same time. Its software senses vehicle dynamics and automatically adjusts the Kalman filter parameters to optimize the position and timing fix.

The unit adds a buffered 3 V CMOS output on a U.Fl mini-coax connector that generates a user-programmable, GNSS-synchronized frequency. It fits directly into the JLT Fury GPSDO and Microsemi/Symmetricom XLI servers, allowing these units to be retrofitted with current receiver performance and features.

When powered from its USB connectors, the receiver operates as a stand-alone, low size, weight, power and cost GNSS receiver and synthesizer. DIP switches, a 7-segment display and status LEDs provide configuration and status reporting.

Key Features

Better than 0.7 m rms horizontal accuracy (WAAS, in motion)
5 ns rms 1 PPS stability (sawtooth corrected)
Runs from USB or M12M power supply
72-channel GPS/Glonass/BeiDou/QZSS/SBAS receiver (any two GNSS at once)
Simultaneous reception of two GNSS systems
Adjustable 1 Hz to 10 MHz+ NCO synthesizer, UTC synchronized
NMEA, SCPI and Motorola Binary Protocol support
Signal strength, satellite status and UTC time display
Form, fit, function compatible with Motorola/iLotus M12M/M12+
Mission-dependent auto-adjusted Kalman filter parameters
High timing and position/velocity accuracy in 3D mobile applications
LED 7-segment status indicator, 5 status LEDs and DIP switch
Automatic internal 3 V antenna power supply
Two USB interfaces for configuration, control and status
Generic buffered NCO synthesizer output synchronized to GNSS on U.Fl coax connector

Specifications

Module

Form, Fit, Function Compatibility	Motorola/iLotus M12+, M12M Timing and Navigation receivers
Dimensions	40 mm x 60 mm x 9 mm (1.575 x 2.362 x 0.35 inch)
Weight	15 grams
Data/Power Header	10 pins, 5 x 2 rows, 1.27 mm spacing (M12M compatible)
MTBF	>600,000 Hours at +40°C

Timing

1 PPS Stability	<5 ns RMS stability GPS Locked, and using quantization correction message
1 PPS Outputs	One 3 V CMOS outputs, one DCD# on USB port for NTP, one NCO buffered output
NCO Synthesizer Output	0.25 Hz to 10 MHz+, 114 MHz typical Synchronized to GNSS, U.Fl coax connector. The web page states 1 Hz to over 14 MHz typically (10 MHz guaranteed); datasheet value shown

Positioning

Position Accuracy	Better than 0.7 m RMS horizontal with GPS and SBAS (WAAS)
Position Accuracy (Auto Survey / Position Hold)	Better than 0.5 m With Auto Survey mode and Position hold position
GPS Receiver Motion Adaptive Filter Settings	Optimized depending on vehicle velocity (Auto-sensing, Auto-switching option)

GNSS Receiver

GNSS Receiver	72 Channels, GPS, Glonass, BeiDou, QZSS, SBAS: WAAS/EGNOS/MSAS/GAGAN
GNSS Frequency, Antenna	L1 GPS and/or Glonass, Active Antenna 3 V to 5 V, +5 dB to +35 dB
Acquisition Sensitivity	-148 dBm
Tracking Sensitivity	-167 dBm GPS and Glonass

Interfaces

USB Control	SCPI-99 Control at 9.6 K, 19.2 K, 38.4 K, 57.6 K, 115.2 K
NMEA Output Sentences	NMEA 0183 rev. 2.3, Sentences: GGA, RMC, ZDA, GSV, PASHR, and others
Motorola Binary Protocol	TTL level serial interface on 10 pin connector, compatible to most Motorola M12M Binary sentences, 9600 baud Guaranteed to operate with Fury GPSDO

Power

Supply Voltage (Vdd)	+2.9 V to +3.45 V max
Power Consumption (display off)	0.185 W Display off
Power Consumption (display on)	0.31 W Display on
Battery Backup (optional)	1.4 V to 3.6 V max (3 V nominal), 15 µA Stores Almanac, Ephemeris, Time, and Date for faster cold-start