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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