radar detection
 

Anyone know anything about marine radar detectors? Brands ? models?
Websites? I'm just doing some reserch for a friend.
Icky

"FMCCARTY" wrote in message
...
Anyone know anything about marine radar detectors? Brands ? models?
Websites? I'm just doing some reserch for a friend.
Icky


They work. They are cheap. They may get you killed if you don't have radar
as well. The assumption that dangereous boats have operative radar is
incorrect to the point of being stupid.

Jim Donohue

Just curious...what's the purpose of a marine radar detector?


"FMCCARTY" wrote in message
...
Anyone know anything about marine radar detectors? Brands ? models?
Websites? I'm just doing some reserch for a friend.
Icky

William G. Andersen wrote:
Just curious...what's the purpose of a marine radar detector?


"FMCCARTY" wrote in message
...
Anyone know anything about marine radar detectors? Brands ? models?
Websites? I'm just doing some reserch for a friend.
Icky

These devices were popular in the 70's when small boat radar was very
expensive. They told you that a radar was operating within a given range,
and had a bearing compass to enable you to "detect" the approx. bearing of
the vessel.

As the poster says, they didn't tell you that you were about to be run down
by a 300,00-ton tanker with his radar switched off.

I don't think they will ever come back and replace AIS!


--
Digital Photo-charts fo all UK areas.
Remove 'nospam' to reply.

Ok, I agree, but he ain't going to put a radar on his boat. anyone know of
some brands, models, websites? He's a stubborn old man what else can I say?
"Red Cloud®" wrote in message
...
On Thu, 05 May 2005 23:07:34 GMT, "FMCCARTY" wrote:

Anyone know anything about marine radar detectors? Brands ? models?
Websites? I'm just doing some reserch for a friend.
Icky


Tell your friend that if he is operating a boat in conditions where he
thinks a
radar detector might be useful, he should not be operating without RADAR.

rusty redcloud

what is ais?
"Dennis Pogson" wrote in message
...
William G. Andersen wrote:
Just curious...what's the purpose of a marine radar detector?


"FMCCARTY" wrote in message
...
Anyone know anything about marine radar detectors? Brands ? models?
Websites? I'm just doing some reserch for a friend.
Icky

These devices were popular in the 70's when small boat radar was very
expensive. They told you that a radar was operating within a given range,
and had a bearing compass to enable you to "detect" the approx. bearing of
the vessel.

As the poster says, they didn't tell you that you were about to be run
down
by a 300,00-ton tanker with his radar switched off.

I don't think they will ever come back and replace AIS!


--
Digital Photo-charts fo all UK areas.
Remove 'nospam' to reply.

William G. Andersen wrote:

Just curious...what's the purpose of a marine radar detector?

It tells you when to fire up the ECM suite!

;-)

Actually I have wondered about the viability of an 'available light' radar
set... It would use the transmitters on other vessels and some **serious**
correlation DSP to produce a plot without needing to transmit as long as
someone was radiating in the general area.

Regards, Dan.

FMCCARTY wrote:
what is ais?
This will explain all - www.aislive.com

On Sat, 07 May 2005 01:31:40 +0100, Dan Mills wrote:

William G. Andersen wrote:

Just curious...what's the purpose of a marine radar detector?

It tells you when to fire up the ECM suite!

;-)

Actually I have wondered about the viability of an 'available light' radar
set... It would use the transmitters on other vessels and some **serious**
correlation DSP to produce a plot without needing to transmit as long as
someone was radiating in the general area.

Regards, Dan.

Dan,
I did a study for a light aircraft collision advoidance device.
It worked on transponder pulses. If your craft's speed and heading are
known, the math to resolve the "taget"'s bearing, range, speed and heading
isn't that difficult, otherwise it *is* pretty difficult.
Norm B

engsol wrote:


Dan,
I did a study for a light aircraft collision advoidance device.
It worked on transponder pulses. If your craft's speed and heading are
known, the math to resolve the "taget"'s bearing, range, speed and
heading isn't that difficult, otherwise it *is* pretty difficult.
Norm B

But don't the transponders on aircraft tend to transmit that information
themselves?

What I was contemplating was a system that just used the other guys radar to
illuminate (and thus to allow a plot) of (possibly multiple) third
parties.... I don't think it is in general possible to come up with a
really good solution without knowing the bearing and range to the radiating
vessel, but with several ships in the area it may be possible to solve for
the radiators position using the returns from the other vessels?

Humm, thinking about it, you can plot bearing to third parties without
needing to know where the radiating vessel is, and you can plot total trip
length if you can get a good lock on the radiators prf which means that IF
you can see several ships using the scatter from any given transmitter then
you CAN in fact locate that transmitter in most cases.

Even without knowing the transmitters PRF, you can get path length
differences from each of your scatter sources which given a sufficient
number of sources (three or four I think?), could resolve the transmitters
location?

I am not sure that the processing required is a power saving over just
running a magnetron and PFN!

Still, given a decent software defined radio RX board and a couple of
downconverters from 9Ghz, it might be fun to play with.

Regards, Dan.