The SLE9125 from dBm Corporation is a Satellite Link Emulator that provides a cost-effective, time-saving, repeatable total solution for satellite-to-ground station RF link testing. The emulator can accurately simulate propagation delays, flat fading, path loss, phase shift, and Doppler shifts let systems engineers create realistic, full-duplex path scenarios for closed-loop testing of satellites, ground processing equipment, and mobile transceivers.
The Satellite Link Emulator can be configured for up to four independent channels with a center frequency of 140 MHz, bandwidth of 125 MHz (L-band for the high bandwidth model) and a delay of less than 890 ms per channel. Optional internal L-band and external C, S, X, and Ku, Ka-band RF converters can be added to expand the frequency range.
The SLE9250 has a DSP that allows Rayleigh and Rician multipath fading (up to six paths per channel) and digital Additive White Gaussian Noise (AWGN) to be added to the link. The propagation delay of the emulator may be changed under program control and will maintain phase continuity under varying delay conditions. Time-varying delay creates carrier frequency shift and chip period variations that create real-world Doppler shift simulation resulting from satellite overpass and aircraft movements.
The SLE9250 is available in an enclosure that measures 17 x 7 x 21 inches with a front panel having a local control interface and RJ45 ethernet for remote control. It has an internal solid-state memory module that can store the ephemeris data files downloaded via an ethernet connection. This link emulator requires an AC supply voltage of 90-264 V (48-66 Hz) and consumes under 300 VA of power. It is ideal for Earth terminal testing, satellite payload testing, satellite system integration testbeds, mobile transceiver testing, and UAV testing applications.
