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LabSat 4

LabSat 4

LabSat 4 is a powerful GNSS Record & Replay simulator that offers exceptional performance while maintaining the familiar LabSat benefits of being compact, portable, and highly cost-efficient.

Featuring multi-constellation and multi-frequency Record & Replay with 12-bit quantization, 10-60 MHz variable bandwidth and 3 configurable RF channels.

SatGen Simulation Software adds the ability to create custom scenarios for simulated testing.



Simultaneously record up to 3 GNSS channels, each with a 10-60 MHz variable bandwidth and up to 12-bit quantization.

Multi-Constellation & Multi-frequency

Record & Replay all GNSS signals in the Upper and Lower L-Band, including SBAS and Commercial differential services.

High Speed Data Transfer

Efficient file management is delivered via high-speed data transfer to and from the 7.6 TB internal storage via Gigabit Ethernet and USB 3.

User-friendly UI

Intuitive web interface for easy configuration of GNSS signal and external data recording.

API Available

Use API and Ethernet connectivity to automate test programmes, deliver global testing from a centralised point, and seamlessly integrate with wider test set-ups.

Additional Signals

Record a range of additional signals synchronised to the GNSS input, such as dual-CAN, CAN-FD, RS232, and digital signals.

Conducted or Radiated Testing

Test a device with an internal antenna via radiated testing or a device with an external RF connection using conducted testing.

Expand Testing with SatGen Software

Add simulation to your LabSat with SatGen - create bespoke, high-dynamic scenarios at the time, date, and location of your choosing.

Why use LabSat?

Realistic, Reliable & Repeatable Testing


The use of LabSat 4 Record & Replay is a great way to understand, test and validate the real-world operation of GNSS devices without the need for costly, repetitive live-sky field testing. It is a reliable solution for product development, performance testing and benchmarking, and production line testing.


Real-world, live-sky GNSS signals can be recorded once on location and then replayed over and over for accurate, consistent testing indoors. The recording can capture a scenario to test a specific product feature, or represent the wider use of a how and where a product will be used.


Recording captures realistic high-resolution scenarios including challenging conditions such as low signal strength, multipath effects, interference, and spoofing attacks. This enables testing and optimization of PNT devices for resilience and reliability under adverse conditions, eliminating the need for physical replication.

Ease of Use Anywhere

Ease of Use

Using a LabSat requires no special training. It has been designed for ease of use with simple navigation on the unit and an intuitive web interface for test configurations.

Compact Size

LabSat simulators are small, portable and battery powered, making them ideal for live-sky recording in any conditions. Its small size allows LabSat to fit into the most compact of spaces for recording on the move, and if being used as part of a wider test set-up, it fits easily into any standard rack mount.

Plug and Play

LabSat 4 is supplied with a selection of sample scenario recordings so that testing can start straight out of the box.

The one touch Record & Replay user interface means recording starts and stops with the press of a button. View the Quick Start User Guide to see how easy it is to get started with a LabSat.



Using recorded GNSS data for testing reduces the need for repetitive field-testing and saves both time and costs. LabSat was born out of a need for an easy to use and cost-effective GNSS simulator and over 25 years later, it maintains not only its ease of use, but also its highly competitive pricing.

Free Lifetime Support

All LabSat owners benefit from exceptional customer support that is provided free of charge with no support contracts. All future firmware and software updates are also provided for free so that owners continue to have access to all the latest features and upgrades.

Shared Working

LabSat is ideal for modern working including multi-location, global offices and remote working. When recording, LabSat is robust enough to be moved between test locations and, for replay, can simply be passed between engineers or test benches. Additionally, it is easy to share recorded scenarios for replay on another LabSat.

GNSS Testing for all Industry Applications

AEROSPACE & DRONE GNSS TESTING – With Direct Flights Departing from Your Desk

Create custom scenario trajectories to test take-off, flight path and landing.

Create high-dynamic scenarios for drone, aircraft and UAV testing.

Record & Replay signals from all constellations, including restricted signals with encrypted coding, making LabSat ideal for military level applications.

AUTOMOTIVE & AV GNSS TESTING – Driving Accuracy at Every Turn

Record and synchronise CAN bus and RTK drive data for automotive, autonomous and fleet testing.
For V2X systems, braking and signalling information can be recorded and replayed alongside GNSS signals.
Use SatGen to generate a GNSS scenario of a route for repeatable testing of a vehicle or ADAS system in any location.

SPACE – GNSS Testing for when the sky is not your limit

Create custom scenarios with trajectories to test launch, in-orbit and re-entry manoeuvres.

Follow the True Horizon with a dynamically changing elevation mask.

SatGen, is not limited to the standard GNSS receiver restrictions of 1000 knots and/or 18,000 m, making it an ideal to test ‘space qualified’ receivers.

AGRICULTURE – Precision GNSS testing for any field of smart agriculture

Develop autonomous vehicles and machinery with repeatable testing.

Synchronise the recording of additional data, including CAN bus signals and RTK base station corrections, utilised in autonomous and precision agriculture vehicles.

Create bespoke scenarios to test performance and features such as geofencing and drone flight paths.

IOT – Precision GNSS testing for the connected world

LabSat 3 Wideband offers an easy to use plug and play solution for both development and production line testing and straight forward integration into wider test set-ups.

Use in combination with SatGen Simulation Software to complete realistic test programmes with the upmost flexibility.

EOL – Cost effective and reliable production line and EOL testing

LabSat is a plug and play standalone solution and is easily integrated into custom test set-ups.

API and Ethernet connectivity allows for automated test programmes that deliver global testing from a centralised point.

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Features in detail


LabSat 4 has 3 RF channels that can be individually customized. Each channel can be set with up to 12-bits I & Q quantization with intermediate setting choices of 1, 2, 4, 8 and 12 bits. The bandwidth is also variable and can be set from 10 - 60 MHz.

These performance settings comfortably capture almost any combination of GNSS signals simultaneously, whilst ensuring the efficient use of recording resources and file management.

For increased efficiency, custom record settings can be saved and quickly selected for future recordings.

High-Speed Data Transfer

LabSat 4 offers efficient file management via high-speed data transfer to and from the 7.6 TB internal storage via Gigabit Ethernet and USB 3.

This makes it easy to download recorded scenarios when conducting live-sky recording in the field. Additionally, it is quick to upload recorded or simulated scenarios ready for replay.


SatGen Simulation Software allows you to create a GNSS RF I&Q or IF data file based on a user-generated trajectory that can be replayed on a LabSat GNSS Simulator. This allows you to simulate almost any kind of test at any time, date and location.

Scenarios can feature multi-stop routes and include the crossing of time zones, leap seconds and roll-overs.

satgen4 demo laptop


Additional Signals

LabSat 4 can record a range of additional signals, synchronised to the GNSS input, including dual-CAN, CAN-FD, RS232, digital inputs and correction signals such as DGNSS and RTK.

Simultaneously capturing additional signals can increase the level of playback realism and allows for a wider range of testing.

NMEA data is also recorded via the inbuilt GNSS receiver.

A Video VBOX can be used in combination with LabSat to record video of the test route. This helps to identify the effect of external conditions on your device, such as why exactly was there a drop-out or multi-path reflection at a particular point in the test, and what caused it.

API available

LabSat’s Application Programming Interface (API) provides control and testing automation that allows test scenarios to be programmed to automatically repeat or play in a set order. This improves efficiency with significant testing programs able to be run continuously, without the need for human supervision.

Additionally, the use of the Ethernet connection allows for centralised control of the API, enabling testing at global production facilities to be controlled remotely from a central office. This combination can significantly increase consistency in testing and reduce the scope for user error.

Multi-Constellation & Multi-Frequency

LabSat 4 is engineered to capture and simulate GNSS signals within the upper and lower L-band, as well as the S-Band. LabSat 4 can Record & Replay the following signals:

  • GPS L1, L2, L5
  • Galileo E1, E5a/b, E6
  • GLONASS G1, G2, G3
  • BeiDou B1, B2a/b, B3
  • QZSS L1, L2, L5, L6
  • NavIC L1, L5, S-Band
  • SBAS L1, L5

Further signals can be configured with the Web Interface. Bespoke requirements like Iridium & Sirius XM radio frequencies are available on request.

Conducted or Radiated Testing

If the device under test has an external antenna connection, the LabSat RF output can be connected directly to it for conducted testing.

If the device has an internal antenna and no connection port, either an active GPS antenna or a Passive GPS/GLONASS antenna can be connected to the LabSat RF output, and they will transmit the RF signal over short distances to allow for radiated testing.

Radiated testing will need to be in an RF-screened environment to avoid interference with live signals. This can be done in a fully screened RF room or a portable enclosure, such as the LabSat Test Enclosure. This allows for secure screened testing and is ideal when working with devices that do not have an external antenna connector - such as wearables, smartphones, and sports/fitness trackers.

Record & Replay Options

LabSat 4 is available in two models – Record & Replay or Replay Only.

The Record & Replay version gives full functionality in one box and is a great choice when starting out with GNSS testing. It can be used to record live-sky signals and build up a bank of recorded scenarios ready for Replay through any LabSat 4.

The Replay Only version is ideal for bench testing or production line testing when only the replay of an existing scenario is needed.

Both models are compatible with SatGen Simulation Software, allowing users to generate custom scenarios for replay testing.


User-friendly Interface

Ls4 uiLabSat 4 offers a user-friendly, web interface that is fully accessible through most web browsers. This interface allows complete access and control over the device, enabling recording settings to be customised to meet specific needs.

The scenario library stored on the internal SSD can be organised and managed via the web interface. It offers the flexibility to select and replay files with full command over the attenuation levels for each scenario.

The interface’s customisation extends to each RF channel, both in the pre-record phase and during replay, providing the ability to adjust critical settings such as quantization, centre frequency, bandwidth, and sampling rate.

This level of control ensures precise configuration of the record profile for each available channel, making LabSat 4 an ideal solution for a wide range of GNSS testing and simulation requirements.


See demo version

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Product Specifications

Constellations GPS L1, L2, L5; Galileo E1, E5a/b, E6; GLONASS G1, G2, G3; BeiDou B1, B2a/b, B3; QZSS L1, L2, L5, L6; NavIC L1, L5, S-Band; SBAS L1, L5.
Further signals in the upper and lower L band as well as the S band can be configured with the web interface. Bespoke requirements like Iridium & Sirius XM radio frequencies are available on request.
Nominal Output Signal Level -73dBm/MHz @ 0dB
Variable attenuator provides between +20 dB and –69 dB of adjustment during replay
RF Channels 3
RF Channel Centre Frequencies Selectable
Number of Satellites Observed All in view
Bandwidth Variable 10 - 60 MHz per channel
Sampling Frequency Automatically adjusted to suit Bandwidth 10 – 61 MHz
Quantisation 1, 2, 4, 8, 12 bits I&Q
Data Format I & Q
Additional Logging 2x CAN channels, 4x Digital channels, 1x RS232 channel, 1x CAN-FD
User Defined Simulation Capability Yes, through optional Simulation Software license.
Storage 7.68 TB Solid State Drive (SSD), Removable Battery Pack
8 GB SD Card (for firmware upgrades only)
Active Antenna Voltage Supply 4 - 4.5 V
Reference Oscillator OCXO, Temperature Stability ± 0.05 ppm, Frequency Stability ± 0.3 ppm over first year
TCXO, Temperature Stability ± 0.05 ppm, Frequency Stability ± 1 ppm over first year xx
Operating Voltage 8 V to 30 V DC
Size 137 mm x 167 mm x 52 mm
Weight 1.45 kg with battery and SSD
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To purchase any of the below accessories, please contact your local distributor or email .

LabSat 3 GNSS Test Enclosure


RF shielded enclosure suitable for testing GNSS devices with internal antenna.

Dipole antenna (RLACS219) included.

More info

Passive Rebroadcast Antenna


A passive antenna suitable for replaying GPS L1/L2/L5, GLONASS G1/G2/G3, BeiDou B1/B2, Galileo E1/E5a+b & L-band corrections signals.

LabSat 4 Replacement Active Antenna


An active antenna suitable for recording GPS L1/L2/L5, GLONASS G1/G2/G3, BeiDou B1/B2, Galileo E1/E5a+b & L-band corrections signal.

LabSat Locking Expansion Connector


Allows for RS232, CAN, CAN-FD and digital signals to be recorded/ replayed at the same time as GNSS RF data.

Ensures that a secure lock is achieved during recording in challenging environments.

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