Half aperture antenna resolution system and method
First Claim
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1. A method of sensing elevation of terrain using an airborne weather radar, the method comprising:
- sweeping a radar beam through a horizontal plane with the airborne weather radar;
obtaining radar returns at an antenna associated with the airborne weather radar;
sampling first radar returns associated with a first portion of an antenna;
sampling second radar returns associated with a second portion of an antenna, wherein the second portion includes the first portion;
removing the first radar returns from the second radar returns to obtain third radar returns associated with a third portion, the third portion included in the second portion and not included in the first portion; and
analyzing changes in the third returns to sense elevation of the terrain.
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Abstract
A system and method for sensing elevation terrain using an airborne weather radar. Method techniques include sampling first and second radar returns from a weather radar at two portions of an antenna. First radar returns are removed from second radar returns to generate third radar returns for a third portion of the antenna. The third portion of the antenna is included in the second portion but not the first portion. Changes in the third radar return are analyzed to sense elevation of the terrain.
149 Citations
20 Claims
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1. A method of sensing elevation of terrain using an airborne weather radar, the method comprising:
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sweeping a radar beam through a horizontal plane with the airborne weather radar; obtaining radar returns at an antenna associated with the airborne weather radar; sampling first radar returns associated with a first portion of an antenna; sampling second radar returns associated with a second portion of an antenna, wherein the second portion includes the first portion; removing the first radar returns from the second radar returns to obtain third radar returns associated with a third portion, the third portion included in the second portion and not included in the first portion; and analyzing changes in the third returns to sense elevation of the terrain. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A radar system coupled to a radar antenna, the radar system comprising:
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an antenna for receiving radar returns and providing radar return data to a receive circuit; and a processor coupled to the receive circuit and receiving data representing the radar returns, the processor obtaining a first set of radar return data corresponding to a first smaller portion of the antenna and a second set of radar return data corresponding to a second larger portion of the antenna, the second portion including the first portion, the processor combining the first set of radar return data and the second set of radar return data to obtain a third set of radar return data representative of a third portion of the antenna, the third portion being exclusive of the first portion and being part of the second portion, wherein the processor adjusts; 1;
the first set of radar return data;
or2;
the third set of radar return data;
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both the first set of radar return data and the third set of radar return data;to obtain data including a null response portion. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. An apparatus for sensing terrain height, the apparatus comprising:
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means for sampling weather radar return data associated with a radar scan and providing a first portion of the weather radar return data and a second portion of the weather radar return data, the second portion including the first portion; means for providing a null response portion in response to the first portion, the second portion and a third portion of the weather radar return data, the third portion being formed from the first and second portions; and means for analyzing changes in the null response portion to sense the height of terrain providing returns from the radar scans. - View Dependent Claims (17, 18, 19, 20)
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Specification