Obstacle and terrain avoidance sensor
First Claim
Patent Images
1. A method of terrain mapping and/or obstacle detection for aircraft, comprising:
- (a) transmitting a non-scanning beam that illuminates the terrain and/or obstacles;
(b) receiving a Doppler shifted signal that is Doppler frequency shifted by an amount dependent on an angle between a line of flight of the aircraft and scatterers that reflect the transmitted beam;
(c) determining the angle from the Doppler frequency;
(d) determining the range of at least some of said scatterers; and
(e) determining the azimuth and elevation of the scatterers.
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Accused Products
Abstract
A method of terrain mapping and/or obstacle detection for aircraft, comprising:
(a) transmitting a non-scanning beam that illuminates the terrain and/or obstacles;
(b) receiving a Doppler shifted signal that is Doppler frequency shifted by an amount dependent on an angle between a line of flight of the aircraft and scatterers that reflect the transmitted beam;
(c) determining the angle from the Doppler frequency;
(d) determining the range of at least some of said scatterers; and
(e) determining the azimuth and elevation of the scatterers.
103 Citations
58 Claims
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1. A method of terrain mapping and/or obstacle detection for aircraft, comprising:
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(a) transmitting a non-scanning beam that illuminates the terrain and/or obstacles;
(b) receiving a Doppler shifted signal that is Doppler frequency shifted by an amount dependent on an angle between a line of flight of the aircraft and scatterers that reflect the transmitted beam;
(c) determining the angle from the Doppler frequency;
(d) determining the range of at least some of said scatterers; and
(e) determining the azimuth and elevation of the scatterers. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40)
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41. A method of terrain mapping and/or obstacle detection for aircraft, comprising:
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(a) transmitting a non-scanning beam that illuminates the terrain and/or obstacles;
(b) receiving a Doppler shifted signal that is Doppler shifted by an amount dependent on an angle between a line of flight of the aircraft and scatterers that reflect the transmitted beam;
(c) determining the angle of an object nearest to the line of flight at a certain range; and
(d) displaying a distorted contour in the form of a half circle around the line of flight, whose radius represents the angular distance of this object from the line of flight. - View Dependent Claims (42, 43, 44)
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45. A method of performing radar measurements through Doppler analysis processes, including:
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interlacing pulses having different attributes of frequency, antenna connection, beam position or polarization; and
utilizing the Doppler shifts of reflections of the interlaced pulses to perform spectral analysis of the reflections at different attributes, in parallel. - View Dependent Claims (46, 47, 48, 49, 50, 51, 52)
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53. Radar apparatus for terrain mapping and/or obstacle detection for aircraft, comprising:
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a transceiver that is operative to emit a non scanning antenna beam and to receive signals reflected from said terrain and obstacles; and
a processor that includes;
a Doppler signal analyzer that receives said signals and determines an angle between scatterers associated with the signal and a line of flight of the aircraft;
direction finding that determines one of azimuth and elevation of the scatterers; and
a computer that computes the other of the azimuth and elevation from the determined azimuth or elevation. - View Dependent Claims (54)
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55. A method of polarization stabilization in a radar in which transmitted radiation is polarized during turns or other flight conditions, comprising:
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determining a roll angle of the aircraft; and
rotating the polarization to compensate for the roll angle of the aircraft.
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56. A method of providing wire detection capability, comprising:
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determining a line of flight of an aircraft; and
detecting wires over an angle of over ±
70°
in azimuth about the line of flight. - View Dependent Claims (57, 58)
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Specification