Radar Velocity Folding Correction via Temporal Correlation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing millimeter-wave radar systems face limitations in increasing detection angle or resolution while maintaining measurement accuracy, leading to velocity folding issues that require extensive signal processing and are challenging for autonomous driving applications.
Innovation Solution
A signal processing device and method that measures distance and relative velocity of reflectors using a millimeter-wave radar and performs folding correction based on correlation between measured values at different times, reducing processing complexity and improving detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the number of antennas is increased to increase detection angle or resolution, then detection capability is improved, but device complexity and calculation burden increase
Solution Approach 1:
The patent segments the velocity measurement problem into multiple measurement cycles, measuring velocity at different time points separately. This allows the system to achieve wide velocity range coverage without increasing antenna count, as each measurement cycle uses the same antenna configuration but captures different velocity information that is later combined through correlation processing.
Solution Approach 2:
The patent introduces the time dimension by performing velocity measurements at multiple different time points (first measurement time and second measurement time). This temporal dimension allows the system to resolve velocity ambiguity without adding spatial dimensions (antennas), effectively trading time for velocity range coverage.
2Manufacturing precision
If the number of antennas is increased to increase resolution, then detection precision is improved, but calculation amount increases
Solution Approach 1:
The patent segments the resolution enhancement problem into temporal segments rather than spatial segments. Instead of adding more antennas to improve resolution, the system performs multiple velocity measurements at different time points and uses correlation processing to achieve the desired resolution, thereby avoiding the computational burden of processing signals from multiple antennas simultaneously.
Solution Approach 2:
The patent creates temporal copies of the velocity measurement process by performing measurements at multiple time points. These temporal copies are then processed through correlation to extract accurate velocity information, replacing the need for spatial replication through additional antennas.
3Use of energy by moving object
If transmission and reception of radio waves is limited per hour, then energy consumption is controlled, but velocity measurement range is restricted
Solution Approach 1:
The patent employs periodic action by conducting velocity measurements at multiple discrete time points rather than continuously. This periodic measurement approach allows the system to cover a wide velocity range through correlation processing of measurements taken at different times, while maintaining controlled energy consumption by limiting the total number of transmission-reception cycles per hour.
Solution Approach 2:
The patent transitions from a single-time-point velocity measurement to multi-time-point measurements, adding the time dimension to the measurement process. This allows the system to achieve wide velocity range coverage without increasing the frequency or intensity of radio wave transmissions, thereby maintaining energy efficiency while expanding measurement capabilities.
4Measurement precision
If folding correction calculation is performed with traditional methods, then velocity accuracy is improved, but processing time and computational burden increase
Solution Approach 1:
The patent performs preliminary velocity measurements at multiple time points before final velocity determination. By collecting velocity data at different time points in advance and establishing their correlation, the system prepares the necessary information for accurate folding correction without requiring complex real-time calculations, thus reducing processing time while maintaining velocity accuracy.
Solution Approach 2:
The patent uses feedback by utilizing the correlation between velocity measurements at different time points to inform the folding correction process. The measured velocity at one time point provides feedback that helps determine the correct folding correction for other time points, reducing the computational burden compared to independent correction of each measurement.
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 approach reduces the processing burden of folding correction and enhances the detection capabilities of millimeter-wave radar systems, allowing for wider velocity ranges and improved object sensing in autonomous driving scenarios.
Implementation Method 1
a transmission signal transmission unit that transmits a transmission signal toward a target object, a reception unit that receives a reception signal reflected by the target object
Implementation Method 2
measuring a distance and relative velocity of a reflector that reflects a transmission signal from the radar
Data Source
AI summary
The present technology relates to a signal processing device, a signal processing method, a program, and an information processing device capable of reducing processing of folding correction of velocity measured by a radar.The signal processing device includes a measurement unit that measures, on the basis of an output signal from a radar, a distance and relative velocity of a reflector that reflects a transmission signal from the radar, and a correction unit that performs folding correction of measured velocity of the reflector on the basis of correlation between a measured distance and measured velocity of the reflector at a certain measurement time, and a measured distance and measured velocity of the reflector at a time before the measurement time. The present technology can be applied to, for example, a system that senses an object around a vehicle.