RIS-Based Hologram Dataset Generation Without Mechanical Scanning
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional hologram dataset generation methods suffer from slow data acquisition due to raster scanning, mechanical delays, and positioning errors, and require costly lens setups.
Innovation Solution
Utilizing a DCS with controllable scattering elements to emulate different transmitter and receiver positions through phase shift configurations, allowing static entities to generate holograms without mechanical movement, and employing a codebook to mimic scanning positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a moving scanning arm is used to perform raster scanning for hologram dataset generation, then the complete scanning coverage is achieved, but the data acquisition speed becomes slow and positioning errors accumulate
Solution Approach 1:
The patent replaces the mechanical scanning arm system with a reconfigurable intelligent surface (RIS) that uses electronically controllable phase shifts to achieve scanning functionality. Instead of physically moving the transmitter and receiver along a scanning arm, the RIS dynamically adjusts the phase of scattered electromagnetic waves to simulate different scanning positions, thereby eliminating mechanical delays and positioning errors while maintaining complete scanning coverage
Solution Approach 2:
The patent implements dynamic phase shift configurations across the RIS elements to emulate the scanning process. By dynamically adjusting the phase shift values in real-time according to a codebook, the system achieves the functional equivalent of mechanical scanning without physical movement, enabling fast hologram dataset generation while preserving measurement precision
2Measurement precision
If the number of scanning positions is increased to achieve high image resolution, then the image quality improves, but the required scanning time increases proportionally
Solution Approach 1:
The patent replaces mechanical scanning with electronic phase shifting through the RIS. The system uses a codebook containing pre-calculated phase shift configurations corresponding to multiple scanning positions. By electronically switching between these configurations, the system achieves high-resolution scanning coverage without the time penalties associated with mechanical movement, thus improving both image resolution and generation speed
Solution Approach 2:
The patent pre-calculates and stores optimal phase shift configurations in a codebook before the actual scanning process. This preliminary preparation allows the system to quickly switch between different scanning positions by simply applying pre-determined phase shifts, eliminating the need for real-time calculation and mechanical repositioning, thereby achieving high resolution with reduced scanning time
3Area of stationary object
If a dedicated lens is added to enhance the aperture of the transmitter antenna for illuminating the whole target object, then the illumination coverage improves, but the system cost and complexity increase
Solution Approach 1:
The patent makes the RIS serve multiple functions: it acts as both the illumination source and the scanning mechanism. By configuring different phase shift patterns across the RIS elements, the system can illuminate the entire target object while simultaneously achieving angular diversity for holographic scanning, eliminating the need for separate lenses and reducing system complexity
Solution Approach 2:
The patent uses the RIS to create virtual copies of the transmitter at multiple different positions and angles. Instead of physically expanding the transmitter aperture with lenses, the RIS generates scattered wavefronts that mimic the effect of having multiple transmitters or a large-aperture lens, achieving wide illumination coverage without additional optical components
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
Faster and more accurate hologram dataset generation with reduced costs and minimized errors, eliminating the need for mechanical scanning and high-quality lenses.
Implementation Method 1
each scattering element having a controllable phase shift
Implementation Method 2
scatter the electromagnetic signal onto the target object
Implementation Method 3
focus the electromagnetic signal reflected from the target object onto a receiver
Implementation Method 4
transmitter configured to transmit an electromagnetic signal
Implementation Method 5
receiver arranged to receive the electromagnetic signal focused by the reconfigurable intelligent surface
Data Source
AI summary
The disclosure provides an apparatus for generating a hologram dataset of a target object. The apparatus comprises a DCS with scattering elements having a controllable phase shift, and a controller configured to control the DCS, using a set of control codewords, to scatter an electromagnetic signal of a transmitter onto the target object and to focus the electromagnetic signal reflected from the target object onto a receiver. Each control codeword defines a respective phase shift configuration for at least a subset of the scattering elements, and the target object is illuminated with the electromagnetic signal scattered by the DCS under a different angle than for the other control codewords and/or the electromagnetic signal reflected from the target object is focused onto the receiver under a different angle than for the other control codewords. The controller generates the hologram dataset based on the focused electromagnetic signal received by the receiver.