Aerospace and Electronic Systems Magazine March 2018 - 15
positioning system (GPS)-disciplined oscillator (GPSDO) is used.
In addition, a calibration signal is used to correct for phase drifts
between the channels [11], [12]. A picture of the system hardware
is provided in Figure 2. In its current setup, the system is composed
of one transmit channel and eight receive channels (expandable).
The receive channels of the SDRs are synchronized with one another and to the transmit channel through using a common COTS
GPS-disciplined reference unit. Custom-made bandpass filters are
connected to the front ends of all receive channels, and they are
made to fulfill the desired radar parameters [13] (see the Field Test
section).
SOFTWARE
COTS-USRPs are programmed using GNU Radio [14]. A flowchart for the software is given in Figure 3, and the corresponding
GNU Radio flowgraph is shown in Figure 4. Mainly, following
some user-specified radar parameters, a linear frequency-modulated continuous wave (LFMCW) chirp is produced digitally. Then,
the LFMCW chirp is fed into a USRP source block that modulates it from baseband to passband. Moreover, the passband chirp
is converted from digital to analog and output through the transmit
front end, amplified using a PA, and transmitted via the transmit
Figure 2.
Hardware of NRI's HF-SDR.
MARCH 2018
IEEE A&E SYSTEMS MAGAZINE
15
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