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The software receiver has a truly open architecture.
Its various functional elements can come together to develop
many different advanced GPS systems. To make this easier,
we also offer different GPS signal simulators. The GPS Signal
Simulator Software produces a data file (similar to sampled,
downconverted signals from the RF front end) that the software
receiver reads. The software simulates both L1 and L2 frequencies
and varied conditions (in geometry, dynamics, signal degradation
and waveform) to evaluate a particular software receiver
design. These simulations include precisely known conditions,
allowing accurate benchmarks.
Software GPS Signal Simulator (SGSS-DF-001-01)
(PDF)
This simulator contains basic signal simulator modules
(DLLs) for both L1 and L2 signals using C/A and P-codes.
It may also generate pseudo-W-codes (unclassified). Only
valid classified users can access Y-codes. The software
can simulate up to 24 GPS satellites, received GPS signal
wave front, multiple antennas in the receiver, and static
and high-dynamical receiver conditions. The simulation
includes receiver dynamics such as linear, ballistic, and
orbital conditions. Special modules model multipath, interference,
ionospheric errors, scintillation, other propagations,
interference, and jamming.
The user can configure the GPS signal simulator using
schematic-based GUI and simple menu-driven instructions,
access intermediate test points in the GPS signal chain
(not possible with hardwired simulators), and introduce
specialized situations. Examples of such situations are
directional jamming, different waveforms, degraded signal
conditions, re-entry plasma effects, space-based GPS signals
in low-Earth and geosynchronous orbits, cluster missions,
networking, formation flying, ocean scattering, multipath
effects, and GPS & INS integration. The output of
the simulator is a data file that the software GPS receiver
can read directly. The file format replicates that of
the RF front ends, which uses data from the IFs. |
