Aerospace and Electronic Systems Magazine March 2018 - 17

El-Darymli et al.

FIELD TEST: SETUP AND
RESULTS

Figure 5.

Doublet transmit antenna installed by NRI at the former naval station site, Argentia, Newfoundland, Canada.

Figure 6.

Receive antennas installed by NRI at the former naval station site, Argentia, Newfoundland. Only the first
eight elements are used in this test.

For the test reported in this article, a doublet transmit antenna
(Figure 5) and (eight) receive antennas (Figure 6) are used. The
transmit antenna is an end-fire,
vertically polarized, two-element
monopole array, with 120° beamwidth and 8-dBi gain. The receive
antenna is an eight-element, vertically polarized, broadside monopole array, with half-wavelength
element spacing. These antennas
were originally installed by NRI
at the former naval station site,
Argentia, Newfoundland, Canada
[15], for the High Frequency Radar Ocean Surface Applications
project [16]. Figure 7 shows the
location of the antennas relevant
to the Placentia Bay buoy [17].
The beam pattern for a single
receive element is omnidirectional, while that for the transmit doublet is shown in Figure 8. Because
of RF license restrictions, a center
frequency of 13.385 MHz was
exclusively used in this field test.
A list of the overall relevant radar
parameters is given in Table 1.
Before running the HF-SDR
system, the receive antennas were
scanned for passive SDR recep-

Figure 7.

Map for the radar site in Argentia relative to the Placentia Bay buoy, Newfoundland, Canada (© Google Maps).

MARCH 2018

IEEE A&E SYSTEMS MAGAZINE

17



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