Movable Radar Virtual Image Specification
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Solution Overview
Problem
Conventional radar technologies face challenges in achieving high positioning resolution to distinguish virtual images from actual objects, requiring complex processing and special apparatus, especially when dealing with electromagnetic waves reflected by fixed objects.
Innovation Solution
An object sensing apparatus and method that emits RF transmission signals, receives reflected waves, calculates range spectra, detects object behavior, specifies fixed objects, and identifies virtual images by calculating the degree of similarity in behavior changes between detected objects, allowing for the specification of virtual images without complex processing or special apparatus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If common radar technology with FMCW scheme is used, then the device complexity is reduced, but the positioning resolution deteriorates (distance resolution becomes 75 cm which is very large compared to wavelength 12 mm)
Solution Approach 1:
The patent makes the radar apparatus movable by mounting it on a vehicle, allowing the apparatus to change position dynamically. This enables the system to acquire multiple sensing results from different positions, which are then used to determine whether detected objects are virtual images or real objects, thereby achieving high positioning resolution without requiring a large number of antenna elements or complex processing.
Solution Approach 2:
The patent performs preliminary sensing actions by acquiring multiple sensing results at different positions before making the final determination. The system collects sensing data from multiple locations in advance, then uses this accumulated information to identify virtual images and determine real object positions, avoiding the need for complex real-time processing while maintaining high positioning resolution.
2Measurement precision
If an array antenna with very large number of antenna elements is used to secure angular resolution, then the positioning resolution is improved, but the device complexity increases (configuration becomes complicated)
Solution Approach 1:
Instead of using a static array antenna with many elements, the patent employs a movable radar apparatus that changes position dynamically. This dynamic approach allows the system to achieve the necessary angular resolution through multiple measurements from different locations, avoiding the need for a complex array antenna configuration while maintaining positioning accuracy.
Solution Approach 2:
The patent creates multiple virtual copies of the sensing measurement by physically moving the apparatus to different positions. Each position provides a slightly different view, and these multiple measurements are combined to achieve high angular resolution without requiring a large number of antenna elements, thus simplifying the overall device configuration.
3Measurement precision
If ray trace method is used to calculate transmission path based on positional relationship, then the virtual image specification accuracy is improved, but the device complexity increases (requires high positioning resolution and complicated processing)
Solution Approach 1:
The patent extracts only the essential information needed for virtual image identification from the multiple sensing results, rather than performing complete ray trace calculations. By comparing the positional relationships and behavior patterns of detected objects across different measurements, the system identifies virtual images without requiring complex transmission path calculations, thereby reducing device complexity while maintaining specification accuracy.
Solution Approach 2:
The patent performs a simplified version of the ray trace method by only considering the essential geometric relationships between the movable apparatus, fixed objects, and detected targets. Rather than calculating complete transmission paths with high precision, the system uses approximate positional relationships from multiple measurements to identify virtual images, achieving sufficient accuracy with less complex processing.
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
Enables the specification of virtual images generated by electromagnetic waves reflected by fixed objects without the need for intricate processing or specialized equipment, improving positioning resolution and simplifying the radar sensing process.
Implementation Method 1
an emission unit configured to emit an RF transmission signal as an electromagnetic wave for object sensing
Implementation Method 2
a reception unit configured to receive a reflected wave of the RF transmission signal as an RF reception signal
Data Source
AI summary
An object sensing apparatus 1 includes: an emission unit 11 configured to emit an RF transmission signal as an electromagnetic wave for object sensing; a reception unit 21 configured to receive a reflected wave of the RF transmission signal as an RF reception signal, and use the RF transmission signal to generate a demodulated signal based on the RF reception signal; a distance detection unit 22 configured to detect a distance to the object that reflected the RF transmission signal based on the range spectrum calculated based on the demodulated signal; a behavior detection unit 23 configured to detect behavior of the object based on the range spectrum; a fixed object specifying unit 24 configured to specify a fixed object from among detected objects based on the distance and behavior; and a virtual image specifying unit 25 configured to, if there are two or more objects other than the fixed object among the detected objects, calculate a degree of similarity in the change over time in the behavior for each combination of the objects other than the fixed object, and specify a virtual image based on the degree of similarity.