Science > Physics > help needed with calculating tilted radar (ornithology)
| Topic: |
Science > Physics |
| User: |
"Henning" |
| Date: |
06 Aug 2003 06:17:33 PM |
| Object: |
help needed with calculating tilted radar (ornithology) |
I have a problem and I need some help with it. Perhaps there is
somewhere someone who can solve some parts of it for me?
We have a ship radar which is rotating around its axis. This axis is
not vertical, it it tilted towards the horizon with 45° or 79° with
+/- 10° on each side of the radar-plane for the fan of the beam. The
orientation of the zenith of the "radar-plane-1500 meter radius" is
strictly north. (One rotation is within 2.5 sec.) The maximum distance
is 1500 meters more or less upwards in the sky. We have now pictures
of echos of single birds which are heading mostly from north to south
through the radar-plane, leaving 5 to 7 echos within 25 seconds. The
radar-screen shows only the distance of an echo and the angle in the
radar-plane / the plane, vertikal to the rotation axis. -> two
dimensional
I assume that this birds are flying strict horizontaly!!
The question now is:
1.: Is it possible to calculate the real height, direction and speed
of one bird (with the help of the radar-plane coordinates of 2 or more
echos and the time between).
2.: And if this is possible, then how?
The problem I have is, that with an upward-to-the-north-tilted radar I
should only be able to calculate if the bird has an East-West or
West-East flight component and its up/down component which should not
be there. But with the assumption of the strict horizontaly flight of
the birds (no realworld up/down component) it should be possible to
calculate the distance in north-south direction through the
"down-component" of the radar-picture, since it comes nearer the radar
and the distance to the radar is shorter. But if the bird is not
directly north of the radar origin, the north-south component is hided
in the West-East component in my opinion and there is my problem.
Any Idea???
Thanks, Henning.
.
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