Polarization ECCM technique for radar systems

• US 5,311,192 A
• Filed: 01/03/1989
• Issued: 05/10/1994
• Est. Priority Date: 01/03/1989
• Status: Expired due to Fees

• Current Assignee: Raytheon Company (Rtx Corporation)
• Original Assignee: Hughes Aircraft Company (Rtx Corporation)
• Inventors: DeWolf, Douglas G., Varga, Ben B.
• Primary Examiner(s): Sotomayor, John B.
• Application Number:
  US07/293,032
• Time in Patent Office: 1,953 Days
• Field of Search: 342/16, 342/17, 342/188, 342/18, 342/19, 342/159, 342/195, 342/149
• US Class Current: 342/188
• CPC Class Codes: G01S 7/36 Means for anti-jamming , e.g. ECCM, i.e. electronic counter-counter measures

Abstract

A process for cancelling the effects of noise jamming in a radar system having a dual-polarization monopulse antenna, a computer processor, and target detection algorithms, wherein the noise jamming produced by a hostile electronic countermeasure on a target is cancelled so as to detect the target in the optimum detection channel. The process consists of the steps of receiving signals from multiple monopulse polarization aperture combinations of the radar antenna, sampling the signals from the radar antenna, digitizing the sampled signals, calculating combination values based upon the samples of the digitized signals, computing several potential target detection channel signals based upon the combination values and samples of the digitized signals, applying the detection channel signals to the computer processor and selecting the optimum detection channel signal for detection of the target using the computer processing whereby the signal is then applied to target detection algorithm of the radar processor.

Claims

1. In a radar system having a dual-polarization monopulse atenna, a computer processor, and target detection channels, the process for cancelling the effects of noise jamming produced by a hostile electronic countermeasure on a target to detect the target with optimum detection channel signal consisting the steps of:

obtaining signals from dual-polarization monopulse sub-aperture combinations of said atenna;

sampling said signals from said atenna;

digitizing said sampled signals;

dividing said samples of said digitized signals into early sample values and late sample values for polarization agile jammers;

calculating combination values based upon said samples of said digitized signals;

computing several potential target detection channel signals based upon said combination values and said samples of said digitized signals;

applying said detection channel signals to said computer processor; and

selecting the optimum detection channel signal for detection of said target using said computer processing whereby said signal is then applied to said target detection channels.

2. The process of claim 1 wherein the optimal detection channel signal is based upon the ratios calculated for polarization agile jammer.

3. A process of claim 1 of combining the signals from 2 dual-polarization monopulse apertures (Σ

, Δ

_Az) wherein up to 3 constant polarization or polarization agile mainlobe or sidelobe jammers are simultaneously cancelled and targets are detected.

4. A process of claim 1 of combining the signals for 3 dual-polarization monopulse apertures (Σ

, Δ

_Az, Δ

_El) wherein up to 5 constant polarization or polarization agile mainlobe or sidelobe jammers, are simultaneously cancelled and targets are detected.