Radar Signal Processing for High-Accuracy Angle Detection
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Solution Overview
Problem
Radar systems face challenges in accurately detecting object angles while minimizing continuous transmission time to avoid interference and heat-related issues, which affects the accuracy of angle detection when the transmission time is shortened.
Innovation Solution
A signal processing apparatus that generates a beat signal from transmitted and received waves, performs AD conversion, divides the data into groups, applies fast Fourier transform, and calculates correlation matrices to determine object angles with increased accuracy by maintaining the number of transformed data even when transmission time is reduced, using a method that divides data into groups during both ascending and descending frequency periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the continuous transmission time of transmitted waves is increased to generate more correlation matrices for spatial smoothing preprocessing, then the accuracy in detecting object angles is improved, but the possibility of interference with other radar apparatus and heat generation is increased
Solution Approach 1:
The patent divides the continuous transmission time into multiple discrete periods, where correlation matrices are generated in each period and then averaged. This segmentation allows the system to achieve the benefits of multiple correlation matrices without requiring excessively long continuous transmission time, thereby reducing interference and heat generation while maintaining angle detection accuracy.
Solution Approach 2:
The patent employs periodic transmission of transmitted waves with defined periods, generating correlation matrices in each period and averaging them across periods. This periodic approach enables the accumulation of sufficient correlation matrices for accurate angle detection while limiting the continuous transmission duration in each period, thus mitigating interference and thermal issues.
2Object-affected harmful factors
If the continuous transmission time of transmitted waves is shortened to reduce interference and heat generation, then the harmful effects are reduced, but the number of correlation matrices is decreased and angle detection accuracy deteriorates
Solution Approach 1:
The patent segments the limited continuous transmission time into multiple shorter periods, generating correlation matrices in each segment and averaging them. This allows the system to maximize the use of available transmission time without exceeding the threshold for harmful interference and heat generation, while still obtaining sufficient correlation matrices for accurate angle detection.
Solution Approach 2:
The patent maintains continuous useful action by systematically generating and averaging correlation matrices across multiple periods. Even though each individual period is shortened to reduce harmful effects, the cumulative process across periods ensures that sufficient correlation data is accumulated to maintain high angle detection accuracy.
Data Source
AI summary
Provided is a signal processing apparatus configured to calculate an angle of a detection point corresponding to an object on the basis of received signals of a plurality of array antennas. A beat signal is generated by a difference between a transmitted signal and a received signal. Digital data is derived through AD conversion of the beat signal. The digital data is divided into a plurality of data groups. A fast Fourier transform is performed on the data groups to acquire a plurality of transformed data corresponding to the number of the data groups. The transformed data are divided into a plurality of sets, correlation matrices for the respective sets are acquired, and an average value of the correlation matrices is calculated. The angle of the detection point is calculated on the basis of the average value of the correlation matrices.