Courtesy of Navico
A Simrad Broadband Radar in split screen modes shows returns
at different gain settings. Navico 4G Broadband Radar systems
have suggested retail prices of $1,900 or $2,300, depending
on which version, Lowrance or Simrad.
practical issues has required considerable innovation. To
protect our innovations, several patent applications have
been filed relating to the technologies in 4G.
We have noticed that Kelvin Hughes has come out
with a solid-state radome radar for the commercial and
surveillance market. It uses a different technology than
ours—pulse compression. There are rumors of other
makers globally, but unconfirmed as to timing, or if
a product really will be manufactured at the required
reasonable cost. You can see the amount of work
involved and the time it takes to do a good, quality
job. Rest assured, Navico will stay in the lead with this
Korte: If you don’t mind, I’d like to go on about
the top four new features of our 4G. I’m so proud of
One is beam sharpening. This is a feature available in no
other X-Band dome radar at the moment and makes the
18-inch antenna perform like a 3 1/2-foot open array.
The azimuth discrimination of a radar is fundamentally
limited by its horizontal antenna beamwidth. The
antenna beamwidth is a measure of how well the radar
antenna can focus the radar waves into a beam. For
an 18-inch X-band radome, the antenna is only 12
wavelengths long and laws of physics dictate that focus
cannot be better than around 5 degrees in this case. A
radar antenna can therefore be likened to a slightly out-of-focus optical lens.
Because we know how the antenna de-focuses the
image we can correct for this and restore focus. In
4G, the correction is performed by signal processing.
Unfortunately, the characteristics of the antenna mean
that perfect correction is not possible, but improvement