IEEE - Aerospace and Electronic Systems - July 2022 - 12

I Am Not Afraid of the GPS Jammer: Resilient Navigation Via Signals of Opportunity in GPS-Denied Environments
Figure 6.
MATRIX cognitive SDR architecture. The SDR consists of the following: (i) USRPs to collect different radio signals, (ii) various modules to
produce navigation observables from different types of signals (e.g., cellular, LEO satellites, etc.), (iii) external sensors (e.g., IMU, lidar,
GNSS receivers, etc.), whose measurements can be fused with the navigation observables produced by the signal modules, and (iv) navigation
filter that fuses all measurements to produce a navigation solution.
2) two consumer-grade 800/1900 MHz Laird cellular
antennas;
3) a PCIe cable;
4) a laptop;
5) a consumer-grade GPS antenna to discipline the
USRP's onboard GPS-disciplined oscillator (GPSDO).
The two Laird antennas were connected to the USRP
to capture impinging LTE signals, and the USRP was
tuned to listen to two carrier frequencies corresponding to
the eNodeBs in Table 3.
SOFTWARE SETUP
The software setup used in the performed experiment
included the following: i) Septentrio's postprocessing
software development kit and ii) MATRIX, which are
described in the following.
SEPTENTRIOPOSTPROCESSINGSOFTWAREDEVELOPMENT
KIT(PPSDK)TOOL
Septentrio's PP-SDK was used to process GNSS observables
collected by the AsteRx-i V to obtain a GNSS-INS
navigation solution. This integrated GNSS-INS system
was used to produce the ground truth results with which
the produced navigation solution was compared.
MATRIXCOGNITIVESDR
MATRIX is a state-of-the-art cognitive SDR, developed at the
ASPIN Laboratory, for navigation with terrestrial and spacebased
SOPs [47]-[51]. MATRIX continuously searches for
Figure 7.
GUI of the LTE module ofthe MATRIX SDR. The interface has four main windows: (i) Receiver Settings: to be set by the user; (ii) Acquisition
and (iii) Tracking: show the resulting signals in real-time; and (iv) Navigation: plots the navigation solution.
12
IEEE A&E SYSTEMS MAGAZINE
JULY 2022

IEEE - Aerospace and Electronic Systems - July 2022

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