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Complementary automatic gain control for Anti-jam communications

Active Publication Date: 2019-02-21
BAE SYST INFORMATION & ELECTRONICS SYST INTERGRATION INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent text describes a system for improving the ability of RF receivers to operate in noisy or hostile environments. The system uses adaptive analog nulling (AAN) and automatic gain control (AGC) to cancel out interference and increase the dynamic range of the RF receiver. The technical effect of this system is to improve the reliability and performance of RF receivers in challenging environments.

Problems solved by technology

There are a number of non-trivial issues that arise with respect to implementing anti-jam hardware.

Method used

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  • Complementary automatic gain control for Anti-jam communications
  • Complementary automatic gain control for Anti-jam communications
  • Complementary automatic gain control for Anti-jam communications

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0049 is an anti-jam communications system, comprising: a first automatic gain control (AGC) circuit having an input to receive RF signals captured by an antenna, and an output to provide a first gain adjusted version of the received RF signals, the received RF signals including a desired signal and a jammer signal; an interference suppression circuit having an input to the first gain adjusted version of the received RF signals, and to suppress the jammer signal, thereby providing a second gain adjusted version of the received RF signals; and a second AGC circuit having an input to receive the second gain adjusted version of the received RF signals, and an output to provide a third gain adjusted version of the received RF signals; wherein gain provided by the first AGC circuit is substantially complementary to gain provided by the second AGC circuit. As used herein, note that “substantially complementary” does not require a perfect complementary relationship between the first and se...

example 2

[0050 includes the subject matter of Example 1, and further includes the antenna operatively coupled to the input of the first AGC circuit; and a radio frequency (RF) receiver operatively coupled to the output of the second AGC circuit.

example 3

[0051 includes the subject matter of Example 1 or 2, wherein the antenna is an adaptive antenna array.

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PUM

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Abstract

Anti-jamming techniques are provided for RF receivers, such as those that operate in hostile environments. In some embodiments, the techniques are embodied in an anti-jam communications system configured with automatic gain control (AGC) that is complementary. The system includes a first AGC circuit prior to an interference suppression circuit and a second AGC circuit after the interference suppression circuit. The first AGC circuit operates to adjust the power level presented to the interference suppression circuit to facilitate interference cancellation. The second AGC circuit operates to maintain the original power level of the desired communications signal and prevent amplitude errors as the first AGC circuit responds to fluctuations in jammer signal power. The second AGC can be slaved to the first AGC circuit such that the sum of two gain values is held constant, according to some embodiments. In this manner, the first and second AGC circuits provide a complementary-AGC system.

Description

STATEMENT OF GOVERNMENT INTEREST[0001]The invention was made with United States Government support under Contract No. FA8750-11-C-0189 awarded by U.S. Dept of the Air Force. The United States Government has certain rights in this invention.FIELD OF THE DISCLOSURE[0002]The present disclosure relates to communication systems, and more particularly, to anti-jamming techniques for RF receivers intended to operate in noisy or hostile environments.BACKGROUND OF THE DISCLOSURE[0003]A typical radio frequency (RF) communications receiver generally includes an RF front end and a demodulator stage. The RF front end stage generally includes an antenna to capture RF signals, a filter to remove unwanted signals to isolate a desired RF signal, an amplifier to amplify the desired RF signal, and down-conversion circuitry (mixer and oscillator) to convert the RF signal to an intermediate frequency (IF) band. The IF signal can then be further processed by the demodulator stage, and its payload convert...

Claims

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Application Information

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IPC IPC(8): H04B1/10H03G3/30H04K3/00
CPCH04B1/1036H04B2001/1063H04K3/228H03G3/3036H03G3/3052H04K2203/32
Inventor GRENS, CURTIS M.
Owner BAE SYST INFORMATION & ELECTRONICS SYST INTERGRATION INC