Hybrid Simulator
The software signal simulator (SGSS-DF-001-01)
generates a data file containing GPS signal samples, and
stores up to several hours of them, sample-by-sample, in
a large hard disk-based data storage unit (DAAS-HD-00X-0X).
It can transfer these samples at high speeds in real time.
When users play these samples back through DACs and upconverters,
it generates live RF signals at L1, L2, and other frequencies.
This approach combines the advantages of software simulators
with live RF signals. Users can create more complex conditions
than possible with conventional real-time simulators,
but they can’t integrate these with the hardware-in-the-loop
simulation. Users have to perform “scene generation”
beforehand.
The hybrid simulator uses software signal simulation
and a data storage unit we have developed. These data
storage units can record, store, and play back several
terabytes of data at speeds up to 200 MBps. The hybrid
simulator generates high-fidelity navigation signals for
CA, P, and M-codes, as well as some Galileo signals. It allows
complex wave fronts under high dynamics (suitable for
phase array and GPS/INS systems) under varying environments
(multipath, jamming, ionospheric scintillation, and plasma
effects). The ability to synchronize multiple units means
unlimited flexibility and vertical upgrade.
Real-Time Hardware Signal Generators
These signal generators’ revolutionary design provides
unprecedented accuracy, capabilities, flexibility, and
ease of use. They use the most advanced multiprocessor,
and a GUI to configure, control, and monitor the operation
of real-time signal generation. They adapt especially
well to hardware-in-the-loop (HWIL) simulation. This family of Real-Time Signal Simulators utilize our pioneering simulator architecture (see Comprehensive Family of GNSS Signal Generators (PDF) ).
We have developed different hardware simulators to meet
the diverse requirements of navigational communities.
These include a simple C/A code simulator card that interfaces
with a PC; complete C/A code simulators; C/A and P-code
simulators (both L1 and L2); and CA, P and M-code simulators
with extremely complex control and maneuvering options,
jamming simulation, GPS/INS integration, and wavefront
simulation. Hardware-in-the-loop (HWIL) operation is always
assured.
