cagey
Well-Known Member
Saw small article in YM this month re Hi Def Radar 2.5 Bandwidth (kit by Raymarine and Northstar). Anyone know any details or even have opinion re smaller bandwidth.
Thanks
Keith
Thanks
Keith
High Def Radar
- Thread starter cagey
- Start date
Talbot
Well-Known Member
I suspect that the high bandwidth refers to the network cabling rather than the radar itself. this will allow a better processor in the radar putting out more data to a higher definition screen. Depends what you are using your radar for. it should make something like marpa rather more efficient, however, you would need to up the data rate on other instruments to make best use of it - for example the heading sensor.
srm
Well-Known Member
What size antenna did it have?
Basically the wider the antenna the narrower the beam (basic physics) and the narrower the beam (+ shorter pulse length) - the finer the definition.
Complex subject but commercial radars have to meet beam width requirements hence much larger scanners than leisure products.
Basically the wider the antenna the narrower the beam (basic physics) and the narrower the beam (+ shorter pulse length) - the finer the definition.
Complex subject but commercial radars have to meet beam width requirements hence much larger scanners than leisure products.
A
Anonymous
Guest
I don't know this kit but would comment that with GPS nobody uses radar for basic nav any more, it is only for collision avoidance. High definition is not critical for collision avoidance although a poor definition radar would not work well with MARPA.
Long ranges are of no practical use (though it's fun to see your destination 48nm away). The most valuable tools on a radar for the average cruising yachtsman are MARPA, guard zones, and Electronic Bearing Lines so you can monitor the relative bearing and distance from your ship's head. Ease of use and highly intuitive controls are the key things so that you remember how to use it, and so it's easy to explain to your watch crew how to use it (if they can use the radar, even quite low-hours watchkeepers can do a good, safe job).
Long ranges are of no practical use (though it's fun to see your destination 48nm away). The most valuable tools on a radar for the average cruising yachtsman are MARPA, guard zones, and Electronic Bearing Lines so you can monitor the relative bearing and distance from your ship's head. Ease of use and highly intuitive controls are the key things so that you remember how to use it, and so it's easy to explain to your watch crew how to use it (if they can use the radar, even quite low-hours watchkeepers can do a good, safe job).
Evadne
Well-Known Member
[ QUOTE ]
Basically the wider the antenna the narrower the beam (basic physics) and the narrower the beam (+ shorter pulse length) - the finer the definition.
[/ QUOTE ]
I think, basically, they seemed to be saying that there is some digital signal processing to reduce the apparent beamwidth. Given the low data rates of radar signals I can't see any disadvantage in this, I'm more surprised it's not been done before.
Basically the wider the antenna the narrower the beam (basic physics) and the narrower the beam (+ shorter pulse length) - the finer the definition.
[/ QUOTE ]
I think, basically, they seemed to be saying that there is some digital signal processing to reduce the apparent beamwidth. Given the low data rates of radar signals I can't see any disadvantage in this, I'm more surprised it's not been done before.
steve6367
Well-Known Member
Raymarine have information on their website - basicly is signal processing and high res displays.
They claim it will better identify for example a small boat close to a larger one......
Steve
They claim it will better identify for example a small boat close to a larger one......
Steve
Anthony
Well-Known Member
>with GPS nobody uses radar for basic nav any more,
When I cant see the land becasue of fog, I still use radar to confirm that any nearby land is what I am expecting; as much as I love GPS its great to be able to double check it. Takes a bit of getting used to though to interpret the radar image, but worth doing as good practise for using radar full stop.
Anthony
When I cant see the land becasue of fog, I still use radar to confirm that any nearby land is what I am expecting; as much as I love GPS its great to be able to double check it. Takes a bit of getting used to though to interpret the radar image, but worth doing as good practise for using radar full stop.
Anthony