[Milsurplus] RADAR Simulator Question

[J. Forster]

> 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.

Thank you. I'd prefer to do it digitally, if possible, because that allows
for ships location to change the displays. A flying spot scanner is
essentially static.

> 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.

Thank you. It might only be that we need the video data for a couple of
types of ships as a function of range. I wonder if there is crude data on
the RADAR Cross Section of WW II ships available?

> How have you done the memory arrangement in the past?

Essentially this way. Offhand, I can't really think of any other way than
mapping the truncated pie rho-theta segments into a memory. The rho
dimension would be roughly 1 uS circles of constant round trip time, the
theta would be constant angular subtense.

Very rough numbers:

100 mile range ( 1 mile = roughly 10 uS) ==> 1K rho intervals
360 degrees ===> 512 theta intervals
video = 6 bits **

So a 512K x 8 bit memory would allow 4 scenes.

> 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.

I'm not sure if the sets had STC. I'll look when the prints become
available again.

> Are you contemplating own-ship motion (and thus moving map display)?
>
> 73

Yes. Actually the DR system will almost certainly be up well before the
RADARs are. See other post this evening.

Thanks very much,
-John

>
> Tom
> WB3AKD