US 7,095,779 B2Granted

Method and apparatus for automatic jammer frequency control of surgical reactive jammers

AssigneeNetworkfab Corporation

InventorLars Karlsson

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Abstract

A Method and Apparatus for Automatic Jammer Frequency Control of Surgical Reactive Jammers is disclosed. The system and method to autonomously and selectively jam frequency-hopping signals in near real-time. The system has the ability to automatically detect short duration signals (such as those output from frequency hoppers), to automatically determine if detected signal(s) should be jammed, and subsequently to automatically and extremely quickly activate the jamming transmitter on the frequency-hopper transmitter's frequency. Furthermore, the system improves upon the FFT-based front-end system by incorporating a module that automatically and iteratively comparing the digital FFT results to the analog RF signal to the arrive at a total frequency offset between the FFT results and the analog signal so that the transmitted jamming signal will be more accurately applied on the desired or target frequency. Finally, the system provides a programmable user interface so that operators can set up the system to act autonomously as intended, such that operator intervention is unnecessary when the system is placed in jamming operation mode.

Claims18

Dependent claims

An electronic signal jamming system, comprising:

a wideband signal collection front end, comprising:
a wideband receiver for receiving RF signals across a broad spectrum;
a digitizer for creating a continuous stream of digitized data representing said received RF signals;
a digital data conversion means for converting said digitized data into FFT frequency bins;
and
an automatic frequency control module;
a signal evaluation logic module, comprising:
a comparing means for comparing each said frequency bin to configurable preset lockout frequency bins;
a peak detection means for evaluating and calculating the amplitude value for each bin by using a configurable number of data point samples for each of those bins;
a windowing means for evaluating and calculating the amplitude value for each bin by using a configurable number of data point samples for each of those bins;
and
a priority selection means for evaluating the prioritization of jammer signal targets based upon configurable settings, said priority selection means further responsive to said automatic frequency control module;
an internal transmitter also responsive to said comparing, peak detection, windowing, and priority logic for transmitting a jamming signal on said frequency of interest;
and
an internal cycle generator timing circuit for the proper high-speed automatic triggering of all modules of the electronic signal jamming system.

12 more elements

Dependencies are inferred from the claim text.

Facts

Application: 11/201,422Filed 10 Aug 2005 · continuation in part
Priority: 6 Aug 2004
Published: US 2006/0153281 A113 Jul 2006
Granted: 22 Aug 2006
Term ends: Not estimatedThe source records don’t support an estimate.

Classification14 codes

H04L 27/0014
Modulated-carrier systems: carrier regulation
H03J 7/02
Automatic frequency control; Automatic scanning over a band of frequencies: automatic frequency control
H04K 3/41
Jamming having variable characteristics: characterized by the control of the jamming activation or deactivation time
H04K 3/42
Jamming having variable characteristics: characterized by the control of the jamming frequency or wavelength

Family

Application10/912,976Parent of this continuation-in-part · filed 6 Aug 2004
Application60/649,920Us provisional application · filed 3 Feb 2005
US 2006/0153281 A1Pre-grant publication · published 13 Jul 2006
US 2005/0041728 A1Published application
US 7,126,979 B2Related patent
US 7,095,779 B2This patent

From the US filing history. Foreign family members aren’t listed.