Cross-Eye Jamming Detection via Beam Steering Divergence

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Solution Overview

Problem

Cross-eye jamming interferes with RADAR signal processing, causing incorrect angle determinations and loss of track in military and civilian applications, necessitating a method to detect and mitigate this interference.

Innovation Solution

A receive beam steering technique is employed to scan the sum beam, identifying the maximum response and estimating the location of cross-eye sources by comparing the divergence of the sum likelihood angle estimate with the monopulse estimate, allowing for detection and potential mitigation of cross-eye jamming.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If cross-eye jamming is applied to interfere with RADAR signal processing, then the target's opponent experiences loss of track and incorrect angle determinations, but the target achieves desirable countermeasure results

Engineering Contradiction:

Improvecross-eye jamming interferenceVSAvoidtracking accuracy

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The patent converts the harmful cross-eye jamming effect into a useful detection mechanism. By analyzing the characteristic signal patterns produced by cross-eye jamming (where sum and delta signals are swapped), the system identifies the presence of jamming and applies corrective measures, transforming the harmful interference into a detectable signature that enables mitigation

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The patent implements feedback by continuously monitoring the RADAR sum and delta signals for characteristic cross-eye patterns, detecting when jamming is present, and then applying corrective angle determination algorithms. This closed-loop approach allows the system to adapt to jamming conditions and maintain tracking reliability

Inventive Principle:

Principle #23Feedback

2Ease of operation

If conventional monopulse signal processing is used without jamming detection, then the system operates normally under clean conditions, but it becomes vulnerable to cross-eye jamming attacks

Engineering Contradiction:

Improvesignal processing simplicityVSAvoidsusceptibility to cross-eye jamming

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The patent applies preliminary action by implementing jamming detection and mitigation algorithms before the jamming can completely disrupt tracking. The system proactively analyzes incoming sum and delta signals for cross-eye patterns and prepares corrective measures, preventing loss of track rather than reacting after damage occurs

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent introduces an intermediary detection and correction layer between the raw RADAR signals and the angle determination process. This intermediary system analyzes the sum and delta signals for jamming characteristics and applies corrective transformations, protecting the final angle determination from cross-eye jamming effects

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS7843376B1Cross-eye jamming detection and mitigation

Publication Date: 2010.11.30 LOCKHEED MARTIN CORP

AI summary

The invention includes, in its various aspects and embodiments, a method and apparatus for detecting cross-eye jamming. In some embodiments, the invention includes mitigating cross-eye jamming once its presence is detected.