[Milsurplus] RADAR Simulator Question

[Tom Dawson]

John,

Here's a link to a picture of the B&K flying spot scanner used for TV 
servicing.

http://www.labguysworld.com/BK-1077B.htm

It was a sizeable box but not too heavy.

I see from looking back in the messages that you've done the RADAR simulator 
thing before.

I can probably generate a rho-theta data array in MATLAB based on the RADAR 
parameters if you tell me what you want the targets to do and give me the 
characteristics of the antenna beamwidth and pulse width and Rep Rate.

How have you done the memory arrangement in the past?

If you have the memory space then 8 bits would be plenty in terms of 
amplitude (theoretically, 48 dB amplitude range).  Gain of marine RADARS 
were manual (IIRC) but there would have been a Sensitivity Time Control 
(STC) to reduce sea return.  I'd be surprised if that were news to you.  I'm 
not sure but I'd think any kind of AGC would have risked masking targets. 
I think STC was the only automatic gain control used at the time.

Are you contemplating own-ship motion (and tus moving map display)?

73

Tom
WB3AKD






----- Original Message ----- 
From: "J. Forster" <jfor at quik.com>
To: "Tony Snider" <trsnider at cox.net>
Cc: <milsurplus at mailman.qth.net>
Sent: Friday, October 09, 2009 3:35 PM
Subject: Re: [Milsurplus] RADAR Simulator Question


> Hi Tony.
>
> I've reported the bounces to the Postmaster. Thanks.
>
> Interesting. They are called flying spot scanners.
>
> At present we are looking at doing the scene simulation digitally, but the
> capability to scan in maps might be very useful. I'll get back to you in a
> few days. OK?
>
> How big are the units physically? Can you try emailing me a pic in a day
> or so?
>
> Best,
> -John
>
> =============
>
>
>> John,
>>
>> YOUR EMAIL ALWAYS BOUNCES!!
>>
>> I have a few old FAA surplus units there is a photo multiplier tube and a
>> crt with what looks like a slide projector slide in between them of a 
>> map,
>> part of a radar display. I assume it comes out as video. I assume they
>> were
>> used to provide a map overlay on a radar screen. I assume it comes out as
>> video, but I know nothing about them , sounds like might to the job 
>> though
>> Tony
>>
>> ----- Original Message -----
>> From: "J. Forster" <jfor at quik.com>
>> To: <milsurplus at mailman.qth.net>
>> Sent: Tuesday, October 06, 2009 1:31 PM
>> Subject: [Milsurplus] RADAR Simulator Question
>>
>>
>>> In designing a simulator for a WW II vintage SG-1 RADAR, a design
>>> question
>>> has come up.
>>>
>>> First off, the RADAR has a PPI display and the objective is to create a
>>> realistic looking display on the console screen and also on various
>>> repeater displays located about the ship (Battleship Massachusetts).
>>>
>>> Rather than stripping the guts out of the displays and replacing them w/
>>> LCDs, they'd prefer to emulate the original signals and use the existing
>>> hardware as built.
>>>
>>> The PPI displays are magnetic deflection CRTs w/ rotating yokes. Each
>>> display has a yoke servo that takes a synchro signal from the antenna.
>>> This is no problem at all. The same signal will be digitized and used as
>>> an address in a scene PROM or RAM.
>>>
>>> The sweeps will all be locally generated w/in the displays, requiring
>>> only
>>> a trigger signal as originally done.
>>>
>>> My question is about the video. We'll either inject that as an AM
>>> modulated signal at IF frequency or at baseband, but the issue is how
>>> many
>>> bits are needed to create a realistic video display?
>>>
>>> I can only hazard a guess here, as I've never tried it before. At a WAG,
>>> I'd say somewhere between 2 and 8 bits should suffice, but I really
>>> don't
>>> know. One more thing. I don't know, but don't think the RADAR has an IF
>>> gain that varies w/ the sweep, but am not positive.
>>>
>>> Any suggestions are welcome.
>>>
>>> Best,
>>> -John
>>>
>>> ==============
>>>
>>>
>>>
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>
>
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