Capture & replay of I/Q data files

SimIQ Banner


Capture & replay of I/Q data files

Generate RF from I/Q files & accelerate product development

SimIQ enables Spirent’s GSS9000 and GSS7000 Series simulators to capture, replay and share I/Q data files without the need for additional hardware. This capability opens up opportunities for testing receiver algorithms earlier in the development cycle, saving time and money while delivering greater collaborative processes to global teams through simple sharing and consistent playback.

SimIQ Capture is a non-RF mode of operation where I/Q data files are generated and stored by the GNSS simulator.

SimIQ Replay reads I/Q data from files and generates the corresponding RF signals, using Spirent’s GSS9000 or GSS7000, enabling receiver testing at RF. SimIQ Replay generates RF from I/Q files for not only GNSS signals, but also custom waveforms as well as interference/jamming.

SimIQ allows the full customization of I/Q data.

  • Generation of classified signals and codes from I/Q data
    • Approved users can now alleviate any potential security concerns by replaying confidential I/Q data files with the same hardware used to test with civilian signals
  • Testing GNSS software receivers
    • To cope with the demands of short product development timelines, developers are including virtual testing in roadmaps. SimIQ enables validation of GNSS software receivers by injecting the generated I/Q data, removing RF real-time constraints and allowing massive parallel simulation
  • Validation of receiver algorithms
    • SimIQ enables developers and testers to validate models before the real hardware is introduced. The efficient sharing of I/Q files means the same realistic scenarios can later be used to validate the hardware front end
  • Injection of externals signals
    • SimIQ Replay generates RF including GNSS signals, custom waveforms, custom noise, and even interference and jamming events, helping users to navigate through growing GNSS vulnerabilities
  • Configurable sample rates up to 120 Ms/s
  • Bit-depths up to 16 bits
  • Simultaneous recording of up to three files
US Soldier Warfighter GPS Navigation

From RF to I/Q: Why GNSS Receiver Testing is “Shifting Left”

“Shift left” has become a common phrase in the software industry, but not so much – yet – in GNSS receiver development. It refers to the stage of the development cycle at which testing is carried out. In the past, software applications were typically tested only after they’d been written, meaning that whole systems had […]

Read Blog
GSS9000 Simulation Product


The most powerful PNT/GNSS simulator/test system

View Product

Spirent Introduces SimIQ to Accelerate GNSS Product Evolution

Pleasant Grove, UT, August 11, 2020 – Spirent Federal Systems, the nation’s leader in global navigation satellite systems (GNSS) testing solutions, today announced the release of SimIQ, a new software that will allow for earlier and more efficient GNSS testing during product development. From software-in-the-loop through to final form testing, SimIQ enables developers to collaborate across […]

Read Press Release
@2021 Spirent Federal Systems, Inc.
Office: (801) 785-1448
Customer Support: (801) 785-1275
Website Issue Reporting: