Radar Angle Estimation via Orthogonal Component Evaluation
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Solution Overview
Problem
High-precision radar algorithms require presetting the number of separable angles, leading to increased calculation load and low precision in estimating the number of incoming waves, especially in limited hardware resources like on-vehicle radar systems where rapid changes in target orientation necessitate accurate angle spectrum estimation within a short period.
Innovation Solution
A calculation device evaluates the magnitude of the orthogonal component of mode vectors to determine the proper number of separable angles, eliminating the need for algorithms like AIC or MDL, thereby reducing calculation load and improving estimation accuracy by ensuring the mode vector aligns closely with the input vector.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of separable angles is set larger than the number of incoming waves to ensure accurate arrival direction estimation, then the precision of angle spectrum estimation is improved, but the calculation load increases
Solution Approach 1:
The patent changes the parameter of separable number dynamically based on the number of incoming waves detected in each time slot. Instead of using a fixed large number, the system adapts the separable number to match the actual number of incoming waves, thereby reducing unnecessary calculations while maintaining estimation precision.
Solution Approach 2:
The system dynamically adjusts the separable number according to the detected number of incoming waves in each time slot. This dynamic adaptation allows the calculation load to vary with the actual signal environment, reducing computation when fewer waves are present while ensuring accuracy when more waves exist.
2Productivity
If the number of separable angles is set equal to the number of incoming waves to reduce calculation load, then the calculation efficiency is improved, but the precision of estimating the number of incoming waves becomes insufficient
Solution Approach 1:
The system uses feedback from the angle spectrum estimation process to refine the detection of incoming waves. By iteratively adjusting the separable number based on detected peaks and their correlation with mode vectors, the system improves the precision of incoming wave number estimation while maintaining calculation efficiency.
Solution Approach 2:
The patent performs preliminary detection of the number of incoming waves using algorithms like AIC or MDL before setting the separable number. This preliminary action provides a foundation for subsequent angle spectrum estimation, improving overall precision while avoiding excessive calculation load by starting with an informed initial estimate.
3Ease of operation
If algorithms like AIC or MDL are used to estimate the number of incoming waves before angle spectrum estimation, then the separable number can be determined, but the calculation load increases and estimation precision remains low
Solution Approach 1:
Instead of performing full AIC or MDL calculations to precisely determine the number of incoming waves, the patent uses these algorithms to obtain a preliminary estimate and then refines the separable number based on angle spectrum peaks. This partial action approach reduces calculation load while achieving sufficient precision for practical applications.
Data Source
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AI summary
There is provided a calculation device for a radar apparatus which is configured to specify a direction of a target based on respective reception signals of a plurality of antennae. A calculation unit is configured to use a predetermined estimation algorithm of estimating angles of targets corresponding to a preset separable-number from the respective reception signals, set an arbitrary separable-number to generate a mode vector from the estimated angles of the targets, obtained by the predetermined estimation algorithm, and determine whether the set separable-number is proper or not based on a magnitude of an orthogonal component calculated from the mode vector and an input vector of the respective reception signals.