3D Imaging Sensor Phase Shift Compensation
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Solution Overview
Problem
Existing 3D imaging sensors face challenges in generating accurate images of objects at high speeds, over long distances, and in scenarios where objects are partially obscured or in complex environments, due to issues with phase shifts and incomplete signal reception.
Innovation Solution
A 3D imaging sensor system that employs computational imaging and digital beam forming techniques, using a transceiver array with energy emitter and detector elements, to generate and process transmit signals that are reflected or backscattered from objects, and applies image formation algorithms to adjust for phase shifts and generate 3D images through 2D FFT of reflectivity density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the sensor moves at high speed relative to the object, then the imaging speed is improved, but phase shifts occur that degrade image quality
Solution Approach 1:
The system performs preliminary calibration by moving the sensor to multiple known calibration positions and storing the corresponding phase shifts. Before actual imaging, the system retrieves the appropriate calibration data to compensate for phase shifts, enabling high-speed imaging without quality degradation.
Solution Approach 2:
The system uses stored calibration data as feedback to adjust and compensate for phase shifts during imaging. By comparing current sensor position with pre-calibrated positions, the system applies corrective phase adjustments to maintain image quality at high speeds.
2Area of stationary object
If the sensor is located at a relatively large distance from the object, then the field of view is improved, but the sensed information becomes lacking or incomplete
Solution Approach 1:
The sensor system performs multiple functions: it captures raw imaging data from distant objects while simultaneously collecting calibration data for phase shift compensation. This multi-functionality allows the system to maintain both wide field of view and complete information by using the same hardware for both imaging and calibration purposes.
3Adaptability or versatility
If objects are partially obscured by other undesired objects, then the scene complexity is reduced, but the detection accuracy deteriorates
Solution Approach 1:
The system performs preliminary calibration at multiple positions to build a comprehensive phase shift database. This pre-prepared calibration data enables the system to accurately process complex scenes with obscured objects by compensating for phase variations that occur when signals pass through or around multiple objects.
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
The system effectively generates clear 3D images of objects by compensating for phase shifts and frequency changes, enabling accurate imaging in challenging conditions such as high-speed motion and long distances, and improving image quality by reducing distortions.
Implementation Method 1
generates a transmit signal that is reflected or backscattered by various objects of the scene
Implementation Method 2
The backscattered or reflected signal is received and processed by the 3D imaging sensor
Data Source
Figure 1A
Figure 1B~1D
Figure 2A~2B
AI summary
An advanced communication system (100) is provided. The advanced communication system comprises generating a first signal (102A) with a polyphase coding based on a DFT spread OFDM with at least one CAZAC sequence (102B) in accordance with a configuration condition, applying a digital transmit beamforming (102C) to the generated first signal, converting (104B) the first signal to analog from digital, modulating (104C) the converted first signal with an energy source (104A), emitting (106), using at least one energy emit element, the modulated first signal, detecting (104E) a second signal comprising at least a portion of the emitted first signal that is reflected from at least one object in a scene in a field-of-view, demodulating (104E) the detected second signal, converting (104D) the second signal to digital from analog, converting (102E) the converted second signal to a computational image, and generating (102D) a 3D image by applying coherent detection to the computational image. The first signal comprises a polyphase sequence.