Method for producing map images of surface sea current velocity vectors and altimetric radar system using the method
First Claim
1. A method for producing map images of surface sea current velocity vectors, using a system running along a track above a surface of the sea, the method comprising the steps:
- emitting beams of eletromagnetic waves to the surface from at least two antennas at a distance from each other along a direction of the track and along a direction perpendicular to the track,making an along-track type differential interferometry using electromagnetic waves reflected by the surface, to build up map images of surface sea current velocity vectors,said beam emitting step comprising emitting the beams of electromagnetic waves (LFi, RFi, LAi, RAi, where i=1 and
2) in a left forward and right forward directions of the track and in a left aft and right aft directions of the track, furthermaking differential interferometries between the beams emitted forward (LFi, RFi, i=1 and
2) and aft (LAi, RAi, i=1 and
2),determining values of roll angle and length of an antenna base connecting the at least two antennas,starting from the differential interferometries, andusing the values of the roll angle and the length of the antenna base obtained to build up the map images of surface sea current velocity vectors.
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Accused Products
Abstract
A method for producing map images of current velocity vectors at the surface sea is described in which beams of electromagnetic waves are emitted towards the surface using a system, towards the left forward and right forward sides of the track of the system, and towards the left aft and right aft sides of the track, from two antennas at a distance from each other along the direction of the track and along a direction perpendicular to the track, and values of roll angle and length of the antenna base connecting the two antennas are determined using differential interferometries applied to the electromagnetic waves reflected by the surface between beams emitted forwards and backwards, the map images being built up using an along-track type differential interferometry, using roll angle and antenna base length values obtained.
6 Citations
10 Claims
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1. A method for producing map images of surface sea current velocity vectors, using a system running along a track above a surface of the sea, the method comprising the steps:
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emitting beams of eletromagnetic waves to the surface from at least two antennas at a distance from each other along a direction of the track and along a direction perpendicular to the track, making an along-track type differential interferometry using electromagnetic waves reflected by the surface, to build up map images of surface sea current velocity vectors, said beam emitting step comprising emitting the beams of electromagnetic waves (LFi, RFi, LAi, RAi, where i=1 and
2) in a left forward and right forward directions of the track and in a left aft and right aft directions of the track, furthermaking differential interferometries between the beams emitted forward (LFi, RFi, i=1 and
2) and aft (LAi, RAi, i=1 and
2),determining values of roll angle and length of an antenna base connecting the at least two antennas, starting from the differential interferometries, and using the values of the roll angle and the length of the antenna base obtained to build up the map images of surface sea current velocity vectors. - View Dependent Claims (2, 3, 4, 5)
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6. A system for producing map images of surface sea current velocity vectors using a system passing along a track above a surface of a sea, comprising:
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at least two antennas at a distance from each other in an along-track direction and in a cross-track direction, and means for using electromagnetic waves reflected by the surface to create a differential along-track type interferometry to build up map images of surface sea current velocity vectors, means for using the at least two antennas to emit beams of electromagnetic waves towards a forward left and a forward right of the track and towards an aft left and an aft right of the track, means for carrying out differential interferometries between beams emitted forwards and aft, means for determining values of roll angle and antenna base length connecting the at least two antennas from the differential interferometries, and along-track type differential interferometry means for using roll angle and antenna base length values obtained to build up the map images of surface sea current velocity vectors. - View Dependent Claims (7, 8, 9, 10)
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Specification