(meteorobs) FW: New meteor radar product - active meteor showers

[James Beauchamp]

Remember this is the bi-static case, so the Doppler shift is the sum of the two range rates (tx to target and target to rx). 

The large Doppler shift rate (head echo) is due to the pseudo velocity of the initial trail as the ionized line forms. After that terminates, it becomes the velocity of the ion cloud, with some minor frequency products from the expansion rate and density differences along the trail.

Sent from my iPhone

On Nov 15, 2012, at 2:28 PM, "Jay Salsburg" <jsalsburg at bellsouth.net> wrote:

> Correction:
> 
> Doppler frequency DIVIDED by the Cosine of the angle across the road...
> 
> -----Original Message-----
> From: meteorobs-bounces at meteorobs.org
> [mailto:meteorobs-bounces at meteorobs.org] On Behalf Of Jay Salsburg
> Sent: Thursday, November 15, 2012 2:03 PM
> To: 'Meteor science and meteor observing'
> Subject: (meteorobs) FW: New meteor radar product - active meteor showers
> 
> May I comment?
> 
> RADAR, that is, DOPPLER RADAR is a quirky thing. If you are using Forward
> Scatter RADAR like the all-too-familiar Police RADAR Gun or
> Dashboard-mounted units, the actual velocity of the moving car is a product
> of the Doppler frequency times the Cosine of the angle across the road of
> the RADAR beam. That is why you get that sweeping frequency effect as the
> Car (or Meteor) passes relative to the Beam whether Forward or Back Scatter.
> 
> Since Meteors are leaving trails that reflect the RADAR energy, these trails
> are not going the speed of the Meteor, these trails are much slower, yet
> they can be going hundreds or even thousands of MPH and sometimes slow down
> to near zero at the end of their demise. The Doppler energy from Back
> Scatter is never indicating the actual speed of the trail because of that
> Cosine Angle thing, the actual velocity is always higher. If you can
> calculate the angle of incidence of each audio sample (a three-space
> calculation), it would be possible to assign a compensating multiplier to
> each sample thereby coming close to the speed of the trail, not the speed of
> the Meteor. This would require some kind of video record of the trail that
> very closely matched the Doppler Audio sample's time signatures, a very
> difficult task indeed.
> 
> Ten years ago I embarked and succeeded in a project to create Doppler RADAR
> Software and Hardware to eliminate the Hardware restriction of dedicated
> devices for measuring velocity with RADAR, any RADAR. My Software is
> adaptable to any Carrier frequency RADAR 50 MHz or 70 GHz, it does not
> matter and will display the moving objects velocity graphically. My software
> has extreme accuracy, better than the hardware devices used to calibrate
> most any RADAR system, rendering these hardware devices obsolete.
> 
> My software could be adapted to Back Scatter Meteor RADAR with a modest
> amount of work, I have not attempted to do this because SpecLab does a good
> job of display, but SpecLab does not indicate velocity as my software does.
> My Software can also output the high resolution Doppler sample bins to Excel
> for subsequent charting.
> 
> Jay Salsburg
> 
> -----Original Message-----
> From: meteorobs-bounces at meteorobs.org
> [mailto:meteorobs-bounces at meteorobs.org] On Behalf Of Jim Wooddell
> Sent: Wednesday, November 14, 2012 5:52 AM
> To: Bill Godley; Meteor science and meteor observing
> Subject: Re: (meteorobs) New meteor radar product - active meteor showers
> 
> Good Morning all!
> 
> Speaking of such products....
> 
> Is there / has there / will there ever be /  a software program/s to help
> determine meteorite speed, direction, coordinates for the AllSky
> cams??   It seems like there is a great fundamental need for this, yet
> I can not find one.  Any ideas????
> 
> Kind regards
> 
> Jim
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