Convolutional DRFM Jamming for Dense False Radar Targets

Resolve Bottlenecks,
Find Innovative Solutions
Generate Solutions

Solution Overview

Problem

Conventional DRFM jammers are limited in generating multiple false targets simultaneously due to the need to completely play out the memory before starting the next, leaving most range bins of the victim radar empty.

Innovation Solution

The improved technique involves digitizing the incident waveform and convolving it with a range trace memory containing impulses, allowing for the generation of multiple false targets per range bin by superposition of delayed waveforms.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If conventional DRFM jammer plays out memory contents sequentially, then device complexity is reduced, but the quantity of false targets generated is limited

Engineering Contradiction:
Improvenumber of false targetsVSAvoidmemory playback mechanism
Core Design Contradiction:
Quantity of substanceVSDevice complexity

Solution Approach 1:

The patent segments the memory playback process by dividing it into multiple parallel playback channels. Each channel can independently play out memory contents with different delay times, allowing simultaneous generation of multiple false targets. This segmentation transforms the sequential playback limitation into parallel processing capability, directly increasing the number of false targets without proportionally increasing overall system complexity.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The patent introduces a time dimension by implementing different delay times for each playback channel. Instead of simply playing back memory contents in sequence, the system uses multiple channels with staggered delays to create false targets at different range bins simultaneously. This dimensional approach allows the system to generate multiple false targets from the same memory contents without requiring proportional increases in memory capacity or processing power.

Inventive Principle:
Principle #17Another dimension (Dimensionality change)

2Productivity

If DRFM jammer waits to play out complete waveform before starting next, then manufacturing precision is improved, but productivity decreases

Engineering Contradiction:
Improvefalse target generation rateVSAvoidwaveform playback accuracy
Core Design Contradiction:
ProductivityVSManufacturing precision

Solution Approach 1:

The patent applies preliminary action by pre-loading multiple waveforms into the memory buffer before playback begins. The system prepares all necessary waveform data in advance, allowing parallel playback channels to operate simultaneously without waiting for previous waveforms to complete. This pre-preparation enables continuous high-rate false target generation while maintaining waveform integrity through proper buffer management and synchronization.

Inventive Principle:
Principle #10Preliminary action

Solution Approach 2:

The patent implements continuity of useful action by establishing overlapping playback windows where multiple waveforms are played out simultaneously in different channels. Instead of waiting for one waveform to complete before starting the next, the system maintains continuous playback across multiple channels with carefully managed timing and delay variations. This continuous parallel operation maximizes productivity while preserving waveform accuracy through synchronized playback control.

Inventive Principle:
Principle #20Continuity of useful action

Data Source

PatentUS12504509B2Convolutional digital radio frequency memory (DRFM) jamming
Publication Date: 2025.12.23 TEXTRON SYSTEMS CORP
  • US12504509B2 patent drawing
  • US12504509B2 patent drawing
  • US12504509B2 patent drawing

AI summary

A technique of jamming a victim radar includes digitizing an incident waveform received from the victim radar and convolving the digitized waveform with contents of a range trace memory. The range trace memory stores a sequence of impulses, which, when convolved with the digitized waveform, creates a corresponding sequence of delayed versions of the digitized waveform, one for each impulse in the sequence, and adds together the delayed versions to produce a single output signal. The output signal is then converted to analog form and transmitted back toward the victim radar.