SparkFun

SparkPNT GNSS Disciplined Oscillator

Name: SparkPNT GNSS Disciplined Oscillator
Brand: SparkFun
SKU: SF-GPS-26289

· MPN: GPS-26289

GPS & Location Sensors

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The SparkPNT GNSSDO is a high-performance timing receiver and disciplined oscillator for extremely stable, traceable time in labs, networks and field deploym...

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The SparkPNT GNSSDO is a high-performance timing receiver and disciplined oscillator for extremely stable, traceable time in labs, networks and field deployments. It is built around the Septentrio mosaic-T platform and a SiTime SiT5358 Super-TCXO, combining multi-constellation GNSS timing with a disciplined 10 MHz reference.

Out of the box it provides multi-frequency GPS, GLONASS, Galileo and BeiDou timing, PPS and event timing, remote access, logging and flexible power options. Optional Fugro AtomiChron® timing corrections can be used to reach atomic-class timing performance over encrypted L-band.

An integrated ESP32-WROVER provides a web console, USB-to-Ethernet capability, logging and configuration without needing a separate host microcontroller. Documentation is available for the hardware, firmware and underlying mosaic-T and SiT5358 modules.

Please note: the mosaic-T firmware (4.14.4) supports RTCM input for RTK Rover positioning. RTCM output is not supported, so the mosaic-T cannot be used as an RTK Base.

Features:

High-precision GNSS timing: no subscription required.
Multi-frequency timing: GPS, GLONASS, Galileo and BeiDou timing with <5 ns time-pulse precision and strong resilience against jamming and spoofing.
Ultra-stable 10 MHz frequency output: onboard SiT5358 Super-TCXO delivers ±50 ppb stability with ageing and temperature performance for labs, networks and embedded systems.
Event timestamping: <20 ns using the dedicated SMA event input.
Built-in control and remote access: integrated ESP32-WROVER provides a web console, USB-to-Ethernet capability, logging and configuration.
Flexible power and deployment: USB-C, PoE or barrel-jack power options plus a rugged aluminium enclosure.
L-band correction reception hardware included: bundled antenna and receiver are ready for encrypted L-band correction services, including AtomiChron.
AtomiChron® sub-nanosecond accuracy: timing corrections over encrypted L-band allow the GNSSDO to achieve <1 ns timing accuracy.
AtomiChron® frequency stability: Fugro states AtomiChron provides stability levels that surpass high-calibre industrial cesium clocks and approach hydrogen maser performance.
Authenticated, spoof-resistant timing: corrections include Navigation Message Authentication (NMA).
No Internet dependency: corrections are delivered over encrypted L-band broadcast.
Global coverage and reliability: worldwide ground-station network and multi-continental availability for correction delivery and traceability.

Specifications:

GNSS timing receiver: Septentrio mosaic-T multi-constellation, multi-frequency GNSS timing receiver
Timing features: Accurate and resilient with dedicated timing features
Security: Highly secure against jamming and spoofing with AIM+ unique interference mitigation technology combined with Fugro AtomiChron® services
Update rate: 10 Hz
Hardware channels: 448 hardware channels for simultaneous tracking of all visible supported satellite signals
GPS: L1C/A, L1PY, L2C, L2P, L5
GLONASS: L1CA, L2CA, L2P, L3 CDMA
Beidou: B1I, B1C, B2a, B2b, B2I, B3
Galileo: E1, E5a, E5b, E5 AltBoc, E6
QZSS: L1C/A, L1 C/B, L2C, L5
NavIC: L5
SBAS: Egnos, WAAS, GAGAN, MSAS, SDCM (L1, L5)
L-band: On-module L-band
RTCM input: Supports RTCM input for RTK Rover
RTCM output: RTCM output (RTK Base) is not supported
Time pulse precision: 5ns
Time pulse precision with AtomiChron® (L-Band or IP): < 1ns
Event accuracy: < 20ns
GNSS receiver operating temperature: -40 to 85 °C
mosaic-T USB-C interface: UART and Ethernet-over-USB
ESP32-WROVER processor: 16MB flash, 8MB PSRAM
ESP32 USB-C interface: UART via CH340
Disciplined oscillator: SiT5358 disciplined 10MHz oscillator
Stability: ±50ppb stability
Frequency slope: ±1ppb/°C frequency slope
Typical 20-year aging: ±58ppb typical 20-year aging
Digital frequency pulling: via I²C
Allan Deviation: approaches 1E-14 at 10000 seconds with AtomiChron® enabled
Oscillator operating temperature: -40 to 85 °C (Industrial)
Ethernet PHY interface: KSZ8041NLI Ethernet PHY interface
Ethernet: 10Base-T / 100Base-TX with auto-negotiate and Auto MDI/MDI-X
microSD: microSD socket
microSD connection: Connected directly to the mosaic-T for fast data logging
Display: OLED display
OLED resolution: 128x64 pixels
SMA connections: SMA connections
GNSS antenna connection: GNSS antenna with 3.3V power for an active antenna
10MHz output / input: switchable
10MHz disciplined output: configurable for 5V / 3.3V / 2.8V / 1.8V "CMOS" output and 50 Ohm
10MHz input: 50 Ohm, -14dBm min, +12dBm max
Pulse-Per-Second output (PPSO): configurable for 5V / 3.3V / 2.8V / 1.8V "CMOS" output and 50 Ohm
EventA input: configurable for 5V / 3.3V / 2.8V / 1.8V and 50 Ohm
I/O connections: Robust 3.5mm screw terminals
External DC power input: Fully isolated external DC power input (9V - 36V)
I/O voltage: Switchable 3.3V or 5V I/O voltage
mosaic-T COM2 UART: TX, RX, RTS, CTS
CTS: CTS can be configured as a VCCIO voltage output if needed
mosaic-T EVENT-B: mosaic-T EVENT-B input
I2C: I2C (SCL2 / SDA2) for an external TCXO
Case: Custom extruded aluminium case with machined end panels
Ingress protection: Designed to IP42
Outdoor use: A weatherproof enclosure is required for outdoor use
Power option: mosaic-T USB-C connector
Power option: ESP32 USB-C connector
Power option: Power-over-Ethernet (36V - 57V)
Power option: DC power input (9V - 36V)

Typical applications include quantum and physics laboratories, secure financial timestamping, precision sensing, navigation, instrumentation, telecom networks and distributed systems needing tightly synchronised clocks.

Jargon buster

Plain-language definitions for the technical terms used above.

B1I: A BeiDou satellite signal used for standard positioning. It matters because the receiver must support the signal bands used by a constellation to take advantage of those satellites.
B2a: A BeiDou satellite signal used by newer dual-band GNSS receivers. Support for B2a can improve accuracy and reliability when combined with other GNSS bands.
CTS: CTS stands for Clear To Send, a serial flow-control signal that tells the other device it may transmit. It matters for reliable high-speed serial communication where buffers could otherwise overflow.
E1: A Galileo satellite signal band used for standard positioning. Knowing which signal bands are supported helps you judge compatibility and expected performance of a GNSS receiver.
E5a: A Galileo satellite signal band used for higher-performance positioning services. Support for E5a can help dual-band GNSS receivers improve accuracy and reduce errors from atmospheric delay.
EGNOS: Europe’s SBAS service for improving GNSS positioning accuracy and reliability. It is relevant if the receiver will be used in Europe or nearby supported areas without an RTK correction link.
ESP32: ESP32 is a family of microcontroller modules with built-in wireless features such as Bluetooth and WiFi. Knowing this product uses an ESP32-based module helps explain how it provides wireless serial communication and firmware update features.
GAGAN: India’s SBAS service for improving GNSS positioning. It matters for projects in its coverage region because it can improve standard GNSS accuracy when RTK is not being used.
Galileo: Europe’s satellite navigation system. Galileo support can improve satellite availability and accuracy, especially when combined with GPS and other constellations.
GLONASS: Russia’s satellite navigation system. A receiver that can also use GLONASS has more satellites to choose from, which can improve positioning reliability when the sky view is partly blocked.
GNSS: GNSS stands for Global Navigation Satellite System, covering positioning systems such as GPS and similar satellite networks. It matters here because high-precision GNSS modules can output lots of serial position data that this product can send wirelessly to a computer or phone.
GPS: The US satellite navigation system used by GNSS receivers to calculate position and time. Support for GPS is important because it is widely available and often used together with other constellations for more reliable positioning.
I2C: I2C is a two-wire communication bus used by many sensors and small modules. It matters because several I2C devices can share the same two wires, but each device needs a compatible address and your controller must support I2C.
L1C/A: A GPS signal band used by many GNSS receivers for standard positioning. Support for this band helps determine which satellite signals the receiver can use and how well it can maintain a location fix.
L2C: A second GPS signal band used by dual-band GNSS receivers to improve precision and reduce errors caused by the atmosphere. It matters for RTK and high-accuracy applications because using two bands can produce faster and more reliable centimetre-level fixes.
L5: A modern GNSS signal band used by several satellite systems for more accurate and robust positioning. Dual-band receivers that include L5 can often perform better than single-band receivers, especially for RTK and areas with reflected signals.
microcontroller: A microcontroller is a small computer on a chip that runs your program and controls connected inputs and outputs. For this product, it is the part that reads buttons and sensors, drives the display and speaker, and communicates over Bluetooth.
MSAS: Japan’s SBAS service for improving GNSS positioning. It is useful to know because SBAS benefits depend on whether your project is located in the service’s coverage area.
OLED: OLED stands for organic light-emitting diode, a display type where each pixel produces its own light. It matters because OLED screens are thin, high-contrast and easy to read for small status displays, but they can be more sensitive to image burn-in than some other display types.
PoE: Power over Ethernet lets one Ethernet cable carry both network data and electrical power. This is useful when installing a device where running a separate power adaptor would be difficult.
QZSS: Japan’s regional satellite navigation system designed to improve coverage around Japan and the Asia-Pacific region. QZSS support can improve satellite availability in supported regions when used alongside GPS.
RTK: Real-Time Kinematic positioning is a GNSS technique that uses correction data from a base station to greatly improve location accuracy. It matters if you need centimetre-level positioning for robotics, mapping, surveying, or tracking rather than ordinary metre-level GPS accuracy.
RTS: RTS stands for Request To Send, a serial flow-control signal used to manage when a device is ready to receive data. It matters when moving fast serial streams because flow control can help prevent lost data.
SBAS: Satellite-Based Augmentation System, a set of regional services that broadcast correction information for GNSS receivers. SBAS can improve ordinary GPS-style positioning, although it is not the same as centimetre-level RTK correction.
SMA: A threaded coaxial connector commonly used for antennas. It matters because you need antennas with matching SMA connectors, or suitable adapters, for the LTE and GNSS antenna ports.
UART: UART is a simple serial connection that sends data over separate transmit and receive wires, often labelled TX and RX. It matters because this module is designed to replace a wired UART cable with a wireless link while keeping the same serial data format.
USB-C: A modern reversible USB connector used for power and data connections. On this product it matters because it can connect directly to a computer as well as to a microcontroller project.
WAAS: A North American SBAS service that provides correction data for GNSS receivers. It matters if you are using the product in a supported region and want better non-RTK positioning accuracy.