Radio Link Simulator (RLS)

RLS Picture

The Radio Link Simulator (RLS) facilitates the testing of physical layer and end-to-end network performance of communications systems incorporating one or more satellite or terrestrial radio links.

The simulated signal path includes the RF characteristics of the transmitter, uplink, satellite/relay, downlink, and receiver, via realistic modelling of characteristics such as path delay, Doppler, and fading.

All stations (Transmitter, Satellite/Relay, Receiver) can be in motion, with the affected simulation parameters updated dynamically.  For modelling of HEO, LEO or MEO satellites, the RLS includes integrated real-time multi-satellite orbit calculation.  Additionally, an integrated GPS simulator can be used to output GPS signals corresponding to a selected station’s position, for applications where a station requires a GPS reference in order to operate.

Square Peg offers the following models:

            RLS-50            50 MHz bandwidth, single-channel

            RLS-600          600 MHz instantaneous signal bandwidth, multi-channel (coming in 2020)

  • A comprehensive user interface, with full touch screen support, allows real-world scenarios to be mapped directly to the applicable elements in the signal path.

    Graphical displays of signal spectrum, power profile, and other parameters are available at points throughout the signal path, facilitating debug of test setups and allowing simple visualization of the effects of the applied impairments.



    Independently-specifiable parameters:

    • Fixed carrier frequency error
    • Doppler rate, peak offset
    • Route-based Doppler and path delay (Aero, vehicular)
    • GEO/HEO/LEO/MEO orbital dynamics
    • Interference type, level and frequency offset
    • Continuous phase noise spectrum, level
    • Discrete phase noise level, frequency offset
    • Fading model, bandwidth(s), C/M ratio, differential delay(s), path Doppler(s)
    • Atmospheric effects
    • Antenna phase and/or amplitude jump distribution, magnitude, interval
    • Antenna gain patterns
    • Blockage and shadowing
    • Transmission path delay
    • HPA non-linearity
    • AWGN
    • Filter response (RLS-600 only)

    Other capabilities

    Test loop translator
    GPS simulator


    RLS-50: 1
    RLS-600: 4

    RLS-50: 950 to 2200 MHz
    RLS-600: 950 to 3000 MHz
    Independent for input and output

    Bandwidth RLS-50: 50 MHz
    RLS-600: 600 MHz


    Satellites Up to 8
    Frequency 1575.42 MHz (GPS L1)


    Remote control Ethernet, REST API
    Station position output Ethernet
    ARINC 429
    Antenna pointing input Ethernet
    Antenna emulation OpenAMIP
    Spectral display 2 independent
    Power profile display
    2 independent
    Reference mode


    Sync TTL, configurable as input or output
    Reference 10 MHz
    Ethernet 10/100/1000 Base T
    Serial RS-232/422/485
    USB USB 2.0, USB 3.0
    Video DisplayPort, HDMI, VGA
  • RLS-50 Data Sheet

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