VIAVI Secure μPNT-440 Resilient GPS/GNSS Timing Module

Embeddable in-line timing module that adds multi-source resilient PNT to legacy GPS/GNSS clocks using a GPS L1 RF output.

1 PPS stability, GPS/GNSS locked (L-band): <5 ns RMS
1 PPS stability, altGNSS LEO locked to Iridium STL (L-band): <65 ns RMS
1 PPS stability, eGNSS GEO locked to Fugro AtomiChron on Inmarsat (L-band): <2.5 ns RMS
Holdover performance: <2 µs over 8 hours with rugged OCXO

Datasheet

Overview

The VIAVI Secure μPNT-440 Module is a resilient timing solution based on VIAVI TrustedPNT technology and an intelligent zero-trust multi-source platform. It is designed as an in-line upgrade path for legacy GPS/GNSS systems that are exposed to jamming and spoofing.

The module is installed between the GNSS/STL antenna and the existing GPS clock receiver. Its patented Transcoder generates a clean GPS L1 signal from trusted alternate sources, including authenticated multi-constellation GNSS, GEO SecureTime corrections or LEO STL services, so that legacy GPS clocks continue to operate when GPS is denied or spoofed. The RF GPS L1 output is compatible with existing coax antenna cabling.

SecureTime Services

The μPNT-440 is a GPS/GNSS receiver that supports VIAVI SecureTime GEO and LEO Services. With eGNSS GEO, powered by Fugro AtomiChron on Inmarsat, it provides authenticated spoofing detection and mitigation. With altGNSS LEO-S, powered by Iridium STL, it uses an encrypted GNSS-independent reference traceable to UTC. altGNSS LEO LOCUS adds Iridium-based dynamic timing with positioning support.

Holdover and Control

An integrated rugged OCXO provides holdover in GPS/GNSS-denied or indoor environments. The module offers a comprehensive SCPI command set for control and automation over USB or RS-232, and is supported by the GPSCon Controller Software.

Key Features

Patented Transcoder generates a GPS L1 signal from trusted alternate sources
All-band GNSS receiver supporting GEO satellite signals, plus LEO STL receiver
Integrated rugged OCXO for holdover stability
RF GPS L1 output compatible with existing coax antenna cabling
System meets PRTC-A ITU-T G.8272 spec
TrustedPNT intelligent zero-trust multi-source switchover
eGNSS GEO: enhanced spoof detection and mitigation with <2.5 ns RMS accuracy to UTC
altGNSS LEO-S: Iridium GNSS-independent reference with <65 ns RMS accuracy traceable to UTC
altGNSS LEO LOCUS: Iridium GNSS-independent dynamic timing with positioning support
Installs in-line between the antenna and the existing receiver
Embeddable module that adds secure and resilient PNT to any system
Comprehensive SCPI command set for control and automation via USB or RS-232

Specifications

Timing Performance

1 PPS stability, GPS/GNSS locked (L-band)	<5 ns RMS Typical RMS accuracy traceable to UTC/NIST
1 PPS stability, altGNSS LEO locked to Iridium STL (L-band) SecureTime altGNSS LEO-S	<65 ns RMS Typical RMS accuracy traceable to UTC/NIST
1 PPS stability, eGNSS GEO locked to Fugro AtomiChron on Inmarsat (L-band) SecureTime eGNSS GEO	<2.5 ns RMS Typical RMS accuracy traceable to UTC/NIST; based on Fugro AtomiChron service (<5 ns to UTC 95 % of the time)
Holdover performance	<2 µs over 8 hours with rugged OCXO Minimum of 24 hours GNSS locked @ 25°C, no airflow, no motion
Compliance	PRTC-A ITU-T G.8272

NMEA Messages

Standard	GGA, GLL, RMC, GSA, GSV, ZDA, PASHR
Proprietary	PJLTS, PJLTV, GGAST

GPS/GNSS Receiver

Multifrequency	L1, L2, L3, L5, L6
Constellations	GPS/Galileo (SBAS)/GLONASS/BeiDou/QZSS/NAVIC
Tracking performance (C/N0 threshold), acquisition	33 dB-Hz
Tracking performance (C/N0 threshold), tracking	20 dB-Hz
Time to first fix, cold start	<45 sec
Time to first fix, warm start	<20 sec
Time to first fix, hot start	1 sec
STL LEO receiver sensitivity	-100 dBm tracking
Intelligent zero-trust multi-source switchover	GNSS (4 frequencies, optional eGNSS Navigation Message Authentication on 4 constellations), STL LEO

Oscillator

Frequency stability	±3E-9, -10°C to +75°C

Power

Power supply voltage (Vdd)	+12 VDC ± 1 VDC
Power consumption	<10 W

Environmental

Operating temperature	-25°C to +75°C
Storage temperature	-45°C to +85°C

Mechanical

Height	0.716 in/1.82 cm
Width	3.685 in/9.36 cm
Depth	4.439 in/11.28 cm
Weight	<0.5 lbs/226 grams

I/O Connectors

RF Output	SMA(f) GPS L1 C/A RF output signal to retrofit legacy GPS/GNSS clock equipment
STL Input	SMA(f) STL input signal
GNSS Input	SMA(f) GNSS input signal; antenna bias DC voltage, when enabled (default)
TTL Status	16-pin Hirose connector, 3.3V CMOS Hirose connector DF11-16DP-2DSA; mating connector DF11-16DS-2C
Firmware Updates	Available over serial interfaces in ISP mode; In Situ firmware updates
NMEA Messages	Available over serial interfaces
Primary Serial Control	Mini-USB UART3, mutually exclusive with RS-232 port
RS-232 Serial Control	16-pin Hirose connector UART3, mutually exclusive with mini-USB
RS-422 Serial Control	16-pin Hirose connector UART0, mutually exclusive with TTL port
TTL Serial Control	16-pin Hirose connector UART0, mutually exclusive with RS-422 port
Power	Molex 436400201, 12 VDC ±1 VDC

Specifications are taken from the manufacturer's documentation. See the datasheet for complete and current values.

Applications

Defense
5G communications
SATCOM
Transportation
Data center
Energy
Financial
Critical infrastructure
Retrofitting legacy GPS clocks against jamming and spoofing
Timing in GPS/GNSS-denied or indoor environments

Options & Accessories

Option	Description
22178049-000	PNT-440 Module w/Ruggedized OCXO
SecureTime altGNSS LEO-S	SecureTime altGNSS LEO-S service option — Alternative GNSS-independent source with encryption, <65 ns rms accuracy traceable to UTC (NIST), powered by Iridium STL
SecureTime altGNSS LEO LOCUS	SecureTime altGNSS LEO LOCUS service option — Iridium GNSS-independent dynamic timing with positioning support, enabling enhanced navigation through sensor fusion
SecureTime eGNSS GEO	SecureTime eGNSS GEO service option — Enhanced GNSS source, authenticated spoofing detection/mitigation, <2.5 ns rms accuracy, traceable to UTC, powered by Fugro AtomiChron on Inmarsat