SYSTEM TO PREVENT TWO ROTATING ANTENNAS FROM ILLUMINATING EACH OTHER

• US 20110050483A1
• Filed: 05/27/2010
• Published: 03/03/2011
• Est. Priority Date: 05/27/2009
• Status: Active Grant

• Current Assignee: Thales Nederland BV (Thales SA)
• Original Assignee: Thales Nederland BV (Thales SA)
• Inventors: Leferink, Frank
• Granted Patent: US 8,344,938 B2
• Time in Patent Office: Days
• US Class Current: 342/59
• CPC Class Codes: G01S 7/023 Interference mitigation, e.g. reducing or avoiding non-intentional interference with other HF-transmitters, base station transmitters for mobile communication or other radar systems, e.g. using electro-magnetic interference [EMI] reduction techniques auxiliary means for detecting or identifying radar signals or the like G01S7/021; means for anti-jamming G01S7/36
• CPC Class Codes: G01S 7/0236 Avoidance by space multiplex
• CPC Class Codes: H01Q 1/521 reducing the coupling between adjacent antennas

Abstract

An apparatus or a method for preventing radio-frequency (RF) interferences between rotating antennas. For example, the invention is particularly applicable to radar and communication systems on board naval ships.

Claims

1. A system comprising a first and a second rotating antenna arranged on a naval ship, wherein the rotation speed of the first antenna varies, so as to avoid the two antennas to illuminate each other simultaneously and thirdly provide a full coverage.

2. The system as claimed in claim 1, further comprising a means to adapt the rotation speed of the first antenna including a means to predict, based on the current shift angle between the two antennas and on their current rotation speeds, when the two antennas are likely to illuminate each other simultaneously;

and decreasing the rotation speed in order to prevent the two antennas from illuminating each other simultaneously.

3. The system as claimed in claim 2, wherein, when the first antenna is started at a given initial rotation speed, the means to adapt the rotation speed of the first antenna increases the rotation speed back to the initial rotation speed when the two antennas are not likely to illuminate each other simultaneously.

4. The system as claimed in claim 1, further comprising a means to adapt the rotation speed of the first antenna, including a means to measure the shift angle between the two antennas;

and a means for adapting the rotation speed of the first antenna modifying the rotation speed in order to maintain the shift angle;

when the two antennas are initially shifted by an angle.

5. The system as claimed in claim 4, wherein the rotation speeds of the two antennas are variable.

6. The system as claimed in claim 1, wherein at least one of the two antennas includes a radar antenna.