Aerospace and Electronic Systems Magazine March 2018 - 18
HF Software-Defined Radar for Coastal Ocean Application
Table 1.
List of Radar Parameters
Radar Parameter
Value
Transmit power
50 W
Chirp type
Sweep direction
Sweep time
Figure 8.
Beam pattern for the doublet transmit antenna used in the present test.
tion at a center frequency of 13.385 MHz. The output from the first
receive antenna is shown in Figure 9. Clearly there is interference
within the desired bandwidth, including LFMCW sweeps from
some other HF radar. This is expected to introduce some noise into
the range-Doppler maps (RDMs) (e.g., see the horizontal line at
range of about 25 km in Figure 10e).
Next, data from the eight receive antennas were acquired
and recorded to a personal computer. Then, averaged RDMs
LFMCW
Up
0.52 s
Sweep bandwidth
100 kHz
Center frequency
13.385 MHz
Integration time
10 min
Acquisition date
Oct. 24, 2016
Acquisition time
19:19:30
were generated. The average window and step sizes, respectively, are 256 and 128 (i.e., 50% overlap). The resultant RDMs
are shown in Figure 10. Various wind, wave, and current measurements can be extracted from the RDMs [18], [19]. In this
article, we focus on the wind direction. Clearly, the Bragg peak
from advancing waves has greater energy than that from receding waves, indicating wind with a component antiparallel to the
radar look direction.
Figure 9.
Real-time waterfall plot for the scan of receive antennas without transmission (i.e., only Rx1 is shown) at a center frequency of 13.385 MHz.
18
IEEE A&E SYSTEMS MAGAZINE
MARCH 2018
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