Aerospace and Electronic Systems Magazine March 2018 - 16

HF Software-Defined Radar for Coastal Ocean Application
antenna. On the receive end, the passband
backscatter signal from the antenna is input
via a bandpass filter to the receive front end
and handled in software using the USRP
sink block, which is synchronized with the
source block using the GPS-disciplined reference unit. The receive front end properly
amplifies the signal, demodulates it to baseband, and digitizes it. Furthermore, for each
receive channel, a training sequence is used
to periodically calibrate the receive signal
so that it is properly aligned with the transmit chirp. This automatically corrects for
the random phase offsets among the receive
channels and between the receive channels
and the transmit channel (for details, see
[11] and [12]). Then, the calibrated signal
is dechirped through a complex-conjugate
multiplication with a replica of the transmit chirp. In addition, the dechirped signal
is decimated to the desired sampling rate
through multistage finite impulse response
(FIR) filters, and finally, it is stored to the
computer for further processing.

Figure 3.

Flowchart for the software used in NRI's HF-SDR.

Figure 4.

Simple GNU Radio flowgraph for NRI's HF-SDR. Only two receive channels are shown.

16

IEEE A&E SYSTEMS MAGAZINE

MARCH 2018



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