System to prevent two rotating antennas from illuminating each other

• US 8,344,938 B2
• Filed: 05/27/2010
• Issued: 01/01/2013
• 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
• Primary Examiner(s): Sotomayor, John B
• Application Number:
  US12/788,691
• Publication Number:
  US 20110050483A1
• Time in Patent Office: 950 Days
• Field of Search: 342/74, 342/75, 342/59, 342/159, 342/41
• 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 rotating antenna and a second rotating antenna, the first rotating antenna and the second rotating antenna arranged on a ship, wherein a rotation speed of the first rotating antenna varies, so as to prevent the first rotating antenna and the second rotating antenna from illuminating each other simultaneously and to provide a full coverage.

2. The system as claimed in claim 1, further comprising a means to adapt the rotation speed of the first rotating antenna, including:

a means to predict, based on a current shift angle between the first rotating antenna and the second rotating antenna and on current rotation speeds of the first rotating antenna and the second rotating antenna, when the first rotating antenna and the second rotating antenna are likely to illuminate each other simultaneously; and

a means for decreasing the rotation speed of the first rotating antenna in order to prevent the first rotating antenna and the second rotating antenna from illuminating each other simultaneously.

3. The system as claimed in claim 2, wherein, when the first rotating antenna is started at an initial rotation speed, and the means to adapt the rotation speed of the first rotating antenna increases the rotation speed back to the initial rotation speed when the first rotating antenna and the second rotating antenna 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 rotating antenna, including:

a means to measure a shift angle between the first rotating antenna and the second rotating antenna; and

a means for adapting the rotation speed of the first rotating antenna for modifying the rotation speed of the first rotating antenna in order to maintain the shift angle when the first rotating antenna and the second rotating antenna are initially shifted by an angle.

5. The system as claimed in claim 4, wherein rotation speeds of the first rotating antenna and the second rotating antenna are variable.

6. The system as claimed in claim 1, wherein at least one of the first rotating antenna and the second rotating antenna includes a radar antenna.