VIAVI STL-2600 Low Earth Orbit (LEO) Receiver Module for GNSS-Independent Timing and Positioning

Iridium LEO receiver module with OCXO that generates UTC nanosecond timing and meters-accurate stationary positioning without GNSS.

1 PPS Stability (STL Locked): <65 ns rms
Serial Control: TTL NMEA and Status Output, SCPI serial control and monitoring
NMEA Messages: GGA, RMC, ZDA, GSV, PASHR, GSA
STL Receiver: 3.3 V antenna-power built-in, custom-designed receiver

Datasheet

Overview

The VIAVI STL-2600 is a receiver module that generates UTC nanosecond timing and meters-accurate stationary positioning without depending on GNSS. It works anywhere in the world and operates much like a GPS receiver, but without using GPS.

The module puts a custom-designed Iridium Low Earth Orbit (LEO) receiver and a disciplined, high-stability reference oscillator sub-system on a single circuit board. It provides NMEA, 10 MHz and 1 PPS outputs and is designed to resist jamming and spoofing.

The STL-2600 is designed to work with the VIAVI Iridium-based SecureTime LEO Services as part of a resilient positioning, navigation and timing (PNT) solution. STL lock requires an active subscription to these services. VIAVI provides the GPSCon Controller and JLTerm software for control and monitoring.

Key Features

NMEA, 10 MHz and 1 PPS outputs
OCXO oscillator
Jamming and spoofing resistant
Custom-designed Iridium LEO receiver and disciplined reference oscillator on a single circuit board
GNSS-independent UTC nanosecond timing
Meters-accurate stationary positioning
Optional external 1 PPS and/or 10 MHz reference inputs
Fully field upgradeable firmware through SCPI serial port

Specifications

Module Specifications

1 PPS Stability (STL Locked)	<65 ns rms STL Lock capability requires active subscription to Iridium based SecureTime LEO services
Serial Control	TTL NMEA and Status Output, SCPI serial control and monitoring
NMEA Messages	GGA, RMC, ZDA, GSV, PASHR, GSA
STL Receiver	3.3 V antenna-power built-in, custom-designed receiver
STL Sensitivity, Tracking	-120 dBm 25 dB antenna LNA gain assumed

Power

Supply Voltage (Vdd)	+3.3 V: 0.2 V, -0.1 V
Power Consumption, Dual CPU Mode	1.49 W
Power Consumption, Low Power Mode	<1.1 W

Environmental

Operating Temperature	-40°C to 85°C (-40°F to 185°F)
Storage Temperature	-45°C to 95°C (-49°F to 203°F)

Oscillator Specifications

Frequency Output	10 MHz CMOS 3.3 V
10 MHz Accuracy	<±0.5E-010 after 20 minutes with STL or GNSS
Frequency Stability Over Temperature with STL Holdover	±75E-08 0°C to +60°C
Output spurs	<-110 dBc/Hz

I/O Connectors

1 PPS, 10 MHz External Reference Input	Supports optional external 1 PPS and/or 10 MHz reference inputs
10 MHz Output	CMOS 3.3 V, low phase noise
1 PPS Outputs	UTC (GPS) and UTC (STL) synchronized, CMOS 3.3 V, 200 ms pulse-width
RF Antenna (one for STL, one for GNSS)	Miniature U.Fl coax
+3.3 V Power, 10 MHz out, 1 PPS out, TTL status, TTL serial, ISP/RST	20-pin Samtec, PN: TFM-110-11-H-D, Micro-USB (pwr/control)
Serial Ports (9,600 to 921,600 baud)	NMEA out, SCPI Control/Monitoring, External CSAC/Rb Oscillator control
In Situ Firmware Updates	Fully field upgradeable through SCPI serial port

Regulatory and Compliance

Regulatory Standards	CE, RoHS, CSA

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

Applications

GNSS-independent UTC timing
Resilient positioning, navigation and timing (PNT)
Stationary positioning without GPS
Timing in GNSS-denied or jammed environments

Options & Accessories

Option	Description
22185821	STL-2600 LEO Receiver 3.0 - Timing and Position — Catalog number for the STL-2600 module
SecureTime altGNSS LEO-S	SecureTime altGNSS LEO-S service option — SecureTime Service Option; STL Lock capability requires active subscription to Iridium based SecureTime LEO services
SecureTime altGNSS LEO LOCUS	SecureTime altGNSS LEO LOCUS service option — SecureTime Service Option; STL Lock capability requires active subscription to Iridium based SecureTime LEO services