Spatially Modulated Radar Ranging for Higher-Resolution Detection
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Solution Overview
Problem
Conventional radar detection systems with mechanical scanning structures have limited detection accuracy, obtaining distance information from only one point per detection and resulting in low precision.
Innovation Solution
A detection method and device that utilizes spatial modulation of waveform signals to transmit and receive signals carrying spatial modulation information, determining distance data based on multiple pieces of spatial modulation information and signal flight times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a mechanical scanning structure is used to emit electromagnetic waves and receive echoes, then the system can obtain distance information from only one point per detection, but the detection accuracy and resolution are limited
Solution Approach 1:
The patent replaces the mechanical scanning structure with a spatial modulation approach. Instead of mechanically scanning the electromagnetic wave beam across different angles, the system modulates the spatial distribution of the beam using a spatial light modulator (SLM) or similar device. This allows multiple spatial points to be illuminated simultaneously without mechanical movement, thereby improving detection accuracy while reducing mechanical complexity.
Solution Approach 2:
The patent transitions from one-dimensional sequential scanning to two-dimensional or three-dimensional parallel spatial modulation. By encoding spatial information directly into the electromagnetic wave structure (using spatial modulation codes), the system can retrieve distance information from multiple points simultaneously in different spatial dimensions, achieving high-resolution detection without mechanical scanning.
2Measurement precision
If mechanical scanning is used to obtain distance information point by point, then the system structure is simpler, but the detection resolution and imaging completeness are low
Solution Approach 1:
The system performs preliminary spatial modulation of the electromagnetic wave beam before transmission. The spatial light modulator pre-encodes multiple spatial patterns or codes onto the beam, allowing the receiving end to simultaneously extract distance information from multiple points without sequential scanning. This preliminary action enables parallel detection and significantly improves both resolution and efficiency.
Solution Approach 2:
The patent segments the detection process into independent spatial channels by using spatial modulation codes. Each code or spatial pattern can be independently processed to retrieve distance information for different regions. This segmentation allows simultaneous detection across multiple points, achieving high resolution without sacrificing detection efficiency.
3Measurement precision
If only one point distance information is obtained per detection, then the detection process is simpler, but the imaging completeness and measurement precision are insufficient
Solution Approach 1:
The spatial modulation system enables a single detection operation to serve multiple functions: it simultaneously obtains distance information from multiple points, creates spatial images, and provides high-resolution measurements. The spatial light modulator acts as a universal component that can encode various spatial patterns, making the system capable of performing multiple detection tasks in parallel without requiring separate systems for each function.
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
Improves detection accuracy by acquiring distance data with higher resolution, enhancing measurement precision and completeness of imaging.
Implementation Method 1
modulating the first waveform signal based on the piece of spatial modulation information
Implementation Method 2
receiving a second waveform signal reflected by the to-be-detected target based on the first waveform signal
Implementation Method 3
acquiring a signal flight time carried by the detection signal
Data Source
AI summary
The present invention relates to the field of radar detection. Provided are a detection method and a detection apparatus. The method comprises: emitting a first waveform signal to a target to undergo detection, and receiving a second waveform signal reflected by the target on the basis of the first waveform signal, the second waveform signal carrying spatial modulation information; generating, on the basis of the second waveform signal, a detection signal corresponding to the spatial modulation information, and obtaining a signal flight time carried on the detection signal; and determining distance data of the target on the basis of multiple pieces of the spatial modulation information and signal flight times corresponding thereto.