Patent ID: 9470785
Filing Date: 2016-10-18
CPC Classification: G01N,G01S

Claim Text:
1. A method for detecting oil at sea by means of a frequency modulated coherent oil spill radar with a electronically controlled transmitter and receiver antenna for transmitting and detecting vertical polarization and horizontal polarization, said method comprising the steps of: said transmitter- and receiver antenna is directed towards a sea surface out to a distance of 1000 to 4000 m under a grazing angle of between 0.5 and 30 degrees; and said transmitter antenna transmits at a frequency between 2 GHz and 18 GHz, and frequency modulated with an adjustable bandwidth and with a given transmitted effect less than 10 W, wherein said transmitter antenna has a horizontal antenna lobe smaller than a vertical antenna lobe, with a modulation time less than 4 ms between said polarizations, and said modulation time being adjustable, for the received signal both for the vertical polarization (Γ the calculated ratio is compared with an expected ratio for a clean sea surface, wherein a deviation indicates oil on the sea surface, whereupon the calculated values for said ratio is fed out to a display unit for displaying possible detected oil on the sea surface in the near area of said radar.