3D Imaging Frequency Generators for Interference Mitigation

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Solution Overview

Problem

Existing three-dimensional imaging systems face interference issues due to shared modulation frequencies, which limit their ability to quickly change frequencies and phases, leading to corruption in the 3D imaging process, especially when multiple systems attempt to capture the same scene.

Innovation Solution

A three-dimensional imaging system utilizing multiple frequency generators with adjustable modulation frequencies and phases, implemented using Direct Digital Synthesizer (DDS) or Phase-Locked-Loop (PLL) circuits, allowing for rapid frequency and phase changes without additional signal switching circuits, enabling neighboring systems to identify and use non-offending frequencies to minimize interference.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If multiple 3D imagers use the same modulation frequency, then the imaging process is simplified, but interference and corruption occur between neighboring systems

Engineering Contradiction:

Improvemodulation frequency managementVSAvoidimaging process integrity

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent applies parameter changes by allowing each 3D imager to operate at different modulation frequencies. The system dynamically adjusts the modulation frequency parameter to avoid interference between neighboring imagers, ensuring each system operates at a unique frequency to prevent signal corruption while maintaining simplified operation.

Inventive Principle:

Principle #35Parameter changes

2Adaptability or versatility

If frequency switching is implemented using traditional switch circuits, then multiple frequencies can be generated, but the switching time causes interruption in the imaging process

Engineering Contradiction:

Improvefrequency switching capabilityVSAvoidimaging process interruption

Core Design Contradiction:

Adaptability or versatilityVSLoss of time

Solution Approach 1:

The patent implements preliminary action by pre-configuring multiple frequency generators to be ready simultaneously. Instead of switching between frequencies using traditional circuits that cause interruption, the system has multiple frequency sources prepared in advance, allowing immediate frequency changes without imaging process interruption.

Inventive Principle:

Principle #10Preliminary action

3Device complexity

If only two frequency sources are used with switching, then the system is simpler, but neighboring systems cannot find non-offending frequencies to eliminate interference

Engineering Contradiction:

Improvefrequency generation systemVSAvoidinterference avoidance capability

Core Design Contradiction:

Device complexityVSAdaptability or versatility

Solution Approach 1:

The patent applies universality by implementing multiple frequency generators that can serve different functions. Each generator provides a unique frequency option, allowing the system to universally handle various interference scenarios. Neighboring systems can each select from multiple available frequencies to find non-conflicting operating frequencies, enhancing interference avoidance capability.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This solution allows for quick and arbitrary changes in modulation frequencies and phases, effectively reducing interference and enhancing the accuracy and efficiency of 3D imaging by enabling systems to operate without additional switching circuits, thus improving the reliability of 3D imaging systems in multi-camera scenarios.

Implementation Method 1

implemented using Direct Digital Synthesizer (DDS) or Phase-Locked-Loop (PLL) circuits

Methodology Applied

Scientific EffectDirect Digital Synthesis:

Implementation Method 2

implemented using Direct Digital Synthesizer (DDS) or Phase-Locked-Loop (PLL) circuits

Methodology Applied

Scientific EffectPhase-Locked Loop:

Implementation Method 3

The image capture system is configured to be modulated by another one of the modulation frequencies adjustably generated by another one of the frequency generators to capture reflected light from the light that illuminates the target

Methodology Applied

Scientific EffectLight reflection: Reflection

Implementation Method 4

three-dimensional imaging of a three-dimensional scene

Methodology Applied

Scientific EffectTime of flight: Time of Flight

Data Source

PatentUS11598849B2Signal generating systems for three-dimensional imaging systems and methods thereof

Publication Date: 2023.03.07 MUNRO DESIGN & TECHNOLOGIES LLC

AI summary

Methods and systems for generating illumination modulation signals, image intensifier gain modulation signals, and image sensor shutter control signals in a three-dimensional image-capturing system with one or more frequency synthesizers is disclosed. The illumination modulation signals, image intensifier gain modulation signals, and image sensor shutter signal are all coherent with one another, being derived from a common clock source. The use of frequency synthesizer concepts allow for the use of rapid modulation phase changes for homodyne operation, and further allow the use of rapid modulation frequency changes to mitigate the effects of inter-camera interference.