Anti-jamming system

Patent metadata

Field	Value
Publication number	US-11670848-B2
Application number	US-202017002452-A
Country	US
Kind code	B2
Filing date	Aug 25, 2020
Priority date	Aug 26, 2019
Publication date	Jun 6, 2023
Grant date	Jun 6, 2023

Abstract

The present disclosure provides an anti jamming system for a wireless communication system an antenna array comprising N antenna elements. At least two multiphase filters being connected to the antenna array and configured to receive an antenna element signal from each one of the N antenna elements. An anti-jamming system for a wireless communication system comprising an antenna array comprising N antenna elements and a filter configured to attenuate jamming signals from sources that is greater than, less than, or equal to N. An anti-jamming system for a wireless communication system comprising a multiphase filter connected to the antenna array to receive an antenna element signal from each antenna element of the antenna array, the multiphase filters comprising a first phase and a second phase, wherein the first phase of the multiphase filter executes a Frost's algorithm and the second phase of the multiphase filter executes a Maximin algorithm.

First claim

What is claimed is:

1. An anti jamming system for a wireless communication system, the anti jamming system comprising:
an antenna array comprising N antenna elements, wherein N is a non-zero positive integer; and
a multiphase filter system comprising N first phase filter elements and a second phase filter element, each first phase filter element configured to receive an antenna element signal from a respective one of the antenna elements and provide a filter output, the second phase filter element configured to receive the filter outputs from the first phase filter elements;
wherein each first phase filter element executes a Frost's algorithm with a full period of a PN spread spectrum chip sequence.

2. The anti jamming system as set forth in claim 1 , wherein the anti jamming system is configured to attenuate jamming signals from a number of sources greater than N.

3. An anti jamming system for a wireless communication system, the anti jamming system comprising:
an antenna array comprising N antenna elements, wherein N is a non-zero positive integer; and
a multiphase filter system comprising N first phase filter elements and a second phase filter element, each first phase filter element configured to receive an antenna element signal from a respective one of the antenna elements and provide a filter output, the second phase filter element configured to receive the filter outputs from the first phase filter elements;
wherein the second phase filter element executes a maximin algorithm.

4. The anti jamming system as set forth in claim 3 , wherein the anti jamming system is configured to attenuate jamming signals from a number of sources greater than N.

5. An anti jamming system for a wireless communication system, the anti jamming system comprising:
an antenna array comprising N antenna elements, wherein N is a non-zero positive integer;
a multiphase filter system comprising N first phase filter elements and a second phase filter element, each first phase filter element configured to receive an antenna element signal from a respective one of the antenna elements and provide a first phase filter output, the second phase filter element configured to receive the first phase filter outputs from the first phase filter elements and provide a second phase filter output; and
a demodulator configured to receive the second phase filter output from the second phase filter element and provide at least one null beamforming pattern toward a narrowband or wideband jamming signal and/or provide a maximum beamforming pattern toward a desired signal direction.

6. The anti jamming system as set forth in claim 5 , wherein the anti jamming system is configured to attenuate jamming signals from a number of sources greater than N.

7. An anti jamming system for a wireless communication system comprising a multiphase filter connected to an antenna array to receive an antenna element signal from each antenna element of the antenna array, the multiphase filter comprising a first phase and a second phase, wherein the first phase of the multiphase filter executes a Frost's algorithm and the second phase of the multiphase filter executes a maximin algorithm.

8. The anti jamming system as set forth in claim 7 , wherein the first phase of the multiphase filter executes the Frost's algorithm with a full period of PN spread spectrum chip sequence.

9. The anti jamming system as set forth in claim 7 , wherein the wireless communication system is GPS.

10. The anti jamming system as set forth in claim 7 , further comprising a demodulator configured to receive an output signal of the multiphase filter and provide at least one null beamforming pattern toward a narrowband or wideband jamming signal and/or provide a maximum beamforming pattern toward a desired signal direction.

Assignees

• Univ Wichita State

Inventors

• Kwon Hyuck M
• Pinoyoanuntapong Krittetash
• Pham Khanh

Classifications

• H01Q1/246

  specially adapted for base stations · CPC title

• H04B7/0854

  using error minimizing algorithms, e.g. minimum mean squared error [MMSE], "cross-correlation" or matrix inversion · CPC title

• H04K3/90 Primary

  related to allowing or preventing navigation or positioning, e.g. GPS · CPC title

• H04B7/0617

  for beam forming · CPC title

• H04B7/0845

  per branch equalization, e.g. by an FIR-filter or RAKE receiver per antenna branch (rake receivers as such H04B1/7115) · CPC title