Aerospace and Electronic Systems Magazine August 2017 - 69

Broumandan, Siddakatte, and Lachapelle
Table 3.

Interference Types and Characteristics
Interference Type

Power

Description

CW

JNR = 10 dB

Jammer frequency varied between 8 and 12 KHz in 60 s

Chirp

JNR = 10 dB

Sweep time: 50 μs
Bandwidth: 12 MHz

Wideband noise

JNR = 10 dB

Multipath1

−6 dB

Multipath2

−6 dB

Bandwidth: 25 MHz
Initial delay: 15 m
Phase varied by 2 carrier cycles
Initial delay: 150 m
Phase varied by 2 carrier cycles

Spoofing

+1.3 dB

TEXBAT DS3, Static matched power time push

and added to the clean part of DS3. The baseband samples affected by
interference signals were stored in a hard disk for further processing.
The relative power of jamming signals (wideband noise, CW, and
chirp) to that of ambient noise, also called jamming-to-noise ratio
(JNR), was 10 dB. At this power level of jamming signals, the receiver is still able to track GNSS signals but the jamming signal considerably degrades tracking loop performance. The CW interference
frequency was linearly varied from 8 kHz to 12 KHz in 60 s from the
L1 carrier centre frequency. The sweep time of the chirp jammer was
50 μs and the interference bandwidth was set to 12 MHz around the
L1 centre frequency. The wideband noise covered the entire sampling
bandwidth of the receiver. To investigate the effect of multipath signals on the detection metrics, a multipath propagation scenario where
the LOS correlation peak is affected by multipath reflection in a static
case was considered. Two multipath scenarios were simulated, name-

ly, short and long multipath with initial delay values of 15 m and 150
m with respect to the LOS signal. The multipath signal power was 6
dB below that of the LOS component.
Table 3 summarizes the interference types and characteristics.
Figure 1 shows the IF sample variance outputs and SPCA detection metrics for the entire DS3. The spoofing attack starts at 120
s. Both SPCA and IF sample variance outputs are triggered as soon
as the spoofing attack starts. The GNSS signal affected by various
interference signals is generated by adding the interfering signals
to the clean data set.
Figure 2 shows the spectrum analyses of various signals
using the pwelch power spectral density method. Figure 2(a)

Figure 1.

Figure 2.

IF variance and SPCA tests for DS3 (the values are normalized to clean
data set).

AUGUST 2017

Spectrum analyses of various signals using pwelch power spectral
density.

IEEE A&E SYSTEMS MAGAZINE

69



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