Radar Peak Center Estimation Error Correction
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Solution Overview
Problem
The existing radar apparatus experiences errors in distance calculation due to insufficient sampling frequency, leading to inaccuracies in peak center estimation and subsequent distance measurement, especially when the peak center is not aligned with sampling points.
Innovation Solution
The radar apparatus corrects the estimate error of the peak center by using a correction map to adjust the peak center estimate time, accounting for deviations caused by asymmetric waveforms and limited sampling frequency, ensuring more precise distance calculation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sampling frequency is increased to improve peak center estimation accuracy, then measurement precision improves, but device complexity and processing load increase
Solution Approach 1:
The patent pre-calculates correction values for different sampling positions and stores them in a correction map before actual measurement. This preliminary action allows the system to use simple table lookup during operation instead of complex real-time calculations, achieving high measurement precision without increasing processing complexity during measurement
Solution Approach 2:
The patent introduces a correction map as an intermediary data structure that stores pre-computed correction values. This intermediary allows the system to bridge the gap between limited sampling frequency and accurate peak center estimation by applying pre-calculated corrections rather than requiring high-frequency sampling or complex real-time computation
2Measurement precision
If sampling frequency is increased to capture peak center accurately, then measurement precision improves, but loss of time increases due to longer measurement period
Solution Approach 1:
The correction values are pre-calculated and stored in a correction map before actual distance measurements are taken. This preliminary computation eliminates the need for time-consuming real-time calculations, allowing fast distance measurements with high precision using the same sampling frequency
Solution Approach 2:
Instead of increasing sampling frequency (excessive action) which would extend measurement time, the patent applies partial correction to the sampled data. By correcting the peak center estimation using pre-computed values rather than capturing every detail through high-frequency sampling, the system achieves accurate measurements without extending measurement duration
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 significantly reduces distance calculation errors, maintaining precision regardless of the peak center position, thereby improving the accuracy of object detection in radar systems.
Implementation Method 1
a light receiving element 83 that outputs a voltage signal (light receiving signal) corresponding to the intensity of the condensed reflective light
Data Source
AI summary
A radar apparatus includes an error correction section and a distance calculation section. The error correction section corrects an estimate error of a peak center estimate time which is caused by deviation of an actual peak center generation time in a light receiving signal from sampling of an A/D conversion section. The distance calculation section calculates a distance to a reflective object from a corrected peak center estimate time that is corrected by the error correction section.