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#1
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Useful gadgets
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#2
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Useful gadgets
steve, no one talking here about the radar on military ships. we are talking
about the radar on recreational sailboats. go back to sleep. then how come you are such a dumb squat when it comes to radar? I probably spend more time as radar observer, on my week off, than you do in a year. indeed, you didn't even know you need nearly flat water to see low rocks with radar, as witness your statement below: That may have been true in the 40's and 50's. It's not true anymore. There are all sorts of techniques modern radars use to find things like low rocks in sea clutter, from simple ones like scan averaging and doppler filtering to complex adaptive filters which model the sea clutter and remove it. Steve |
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#3
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Useful gadgets
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#4
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Useful gadgets
schleck, we are talking about radar for recreational sailboats NOT that which
is "commercially available" (your term" for cargo ships. go back to sleep. I'm not talking about military ships either. Scan averaging and/or doppler filtering is commercially available in many units. The military uses much more complex methods. Wake up! Steve |
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#5
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Useful gadgets
schleck, we are talking about radar for recreational sailboats NOT that which
is "commercially available" (your term" for cargo ships. go back to sleep. I'm not talking about military ships either. Scan averaging and/or doppler filtering is commercially available in many units. The military uses much more complex methods. Wake up! Steve |
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#6
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Useful gadgets
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#7
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Useful gadgets
steve, no one talking here about the radar on military ships. we are talking
about the radar on recreational sailboats. go back to sleep. then how come you are such a dumb squat when it comes to radar? I probably spend more time as radar observer, on my week off, than you do in a year. indeed, you didn't even know you need nearly flat water to see low rocks with radar, as witness your statement below: That may have been true in the 40's and 50's. It's not true anymore. There are all sorts of techniques modern radars use to find things like low rocks in sea clutter, from simple ones like scan averaging and doppler filtering to complex adaptive filters which model the sea clutter and remove it. Steve |
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#8
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Useful gadgets
Steven Shelikoff wrote: On 28 Jan 2004 02:05:18 GMT, (JAXAshby) wrote: then how come you are such a dumb squat when it comes to radar? I probably spend more time as radar observer, on my week off, than you do in a year. indeed, you didn't even know you need nearly flat water to see low rocks with radar, as witness your statement below: That may have been true in the 40's and 50's. It's not true anymore. There are all sorts of techniques modern radars use to find things like low rocks in sea clutter, from simple ones like scan averaging and doppler filtering to complex adaptive filters which model the sea clutter and remove it. Steve All true, but I was referring to the standard everyday radar which most boaters will be using. Although "sea return" normally is a pain in the butt, it can be useful. For instance, it can be used to pick up a reef line; in the case above, it will accent the rock which may be just below or just above the surface; I've used it to identify a particular boat which throws a nasty wake that can be seen on radar. All of the above are not guaranteed and depend on conditions, but when the conditions are right they can be useful tools. otn |
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#9
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Useful gadgets
bud-bud, you are talking about using radar in flat calm water, not water with
movement. In anything but flat calm water you can even see a fiberglass sailboat, let alone a submerged reef or rock. besides, why are you wandering around in unknown waters in a fog at speed? dumb. Steven Shelikoff wrote: On 28 Jan 2004 02:05:18 GMT, (JAXAshby) wrote: then how come you are such a dumb squat when it comes to radar? I probably spend more time as radar observer, on my week off, than you do in a year. indeed, you didn't even know you need nearly flat water to see low rocks with radar, as witness your statement below: That may have been true in the 40's and 50's. It's not true anymore. There are all sorts of techniques modern radars use to find things like low rocks in sea clutter, from simple ones like scan averaging and doppler filtering to complex adaptive filters which model the sea clutter and remove it. Steve All true, but I was referring to the standard everyday radar which most boaters will be using. Although "sea return" normally is a pain in the butt, it can be useful. For instance, it can be used to pick up a reef line; in the case above, it will accent the rock which may be just below or just above the surface; I've used it to identify a particular boat which throws a nasty wake that can be seen on radar. All of the above are not guaranteed and depend on conditions, but when the conditions are right they can be useful tools. otn |
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#10
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Useful gadgets
Subject: Useful gadgets
From: (JAXAshby) Date: 01/28/2004 09:50 Pacific Standard Time Message-id: bud-bud, you are talking about using radar in flat calm water, not water with movement. In anything but flat calm water you can even see a fiberglass sailboat, let alone a submerged reef or rock. Jax, as others have said, you need to get back on your "meds". He was NOT talking about flat calm conditions, alone. He was discussing calm as well as conditions where a sea is running. As he said, you don't have enough basic knowledge or experience to understand any of this. besides, why are you wandering around in unknown waters in a fog at speed? dumb. No one said anything about "at speed", but as to the rest, that's why one has charts, GPS's, Radar, Fathometers, etc., coupled with the ability to use them. Again, probably beyond your comprehension. Shen |
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