Radar Azimuth Error Correction via Doppler Analysis
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Solution Overview
Problem
Conventional radar systems mounted on movable bodies face errors in determining azimuth angles due to mechanical and electrical precision issues, antenna differences, and axis deviation, leading to increased costs and potential safety hazards.
Innovation Solution
A radar system that calculates azimuth angle errors based on relative speeds and angle distributions of reflecting points, incorporating an angle error estimating device to correct for axis deviation and improve angular precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If manufacturing adjustments are made to minimize errors, then manufacturing precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent performs preliminary error characterization during manufacturing by measuring azimuth angle errors at multiple predetermined angles, stores these error values, and uses them for subsequent correction. This preliminary action eliminates the need for complex real-time adjustments while maintaining high precision.
Solution Approach 2:
The patent changes the parameter approach from physical adjustment to computational correction. By measuring and storing error parameters at multiple angles and using these parameters for correction calculations, the system achieves high precision without mechanical adjustments.
2Measurement precision
If conventional error correction methods are used, then some precision issues are addressed, but axis deviation errors remain uncorrected
Solution Approach 1:
The patent segments the error correction process into two distinct components: azimuth angle error correction and axis deviation correction. By separately measuring and correcting these two error sources, the system achieves comprehensive accuracy that addresses both individual error types independently.
Solution Approach 2:
The patent performs measurements at more than the minimum required angles (six or more predetermined angles) to capture both azimuth angle errors and axis deviation. This excessive measurement action ensures complete error characterization and enables reliable correction of both error sources.
3Measurement precision
If angle sensors are used to obtain transmission angles, then measurement capability is improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces mechanical angle sensors with a computational approach. By using the radar device itself to measure reflected wave angles and calculating transmission angles from these measurements, the system eliminates the need for separate mechanical sensors while maintaining measurement capability.
Solution Approach 2:
The radar device performs its own angle measurements and error characterization without requiring external sensing equipment. The system uses its transmitted signals and received reflections to self-diagnose and self-correct its angular measurements, eliminating dependency on additional sensors.
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
The system achieves accurate angular precision by estimating and correcting azimuth and axis deviation angles, enhancing safety and reducing costs associated with manufacturing and maintenance.
Implementation Method 1
a radar device that calculates relative speeds and angles of plural reflecting points
Implementation Method 2
uses reflection of propagation waves such as radio waves, sound waves, or light waves
Implementation Method 3
estimates errors of the angles calculated by the radar device based on the relative speeds and the angles of the plural reflecting points
Data Source
AI summary
To obtain a radar system capable of obtaining an appropriate angular precision by calculating an angle error based on distributions of relative speeds and angles of reflecting points, and of obtaining the appropriate angular precision including an axis deviation angle by simultaneously calculating the angle error and the axis deviation angle. A radar system mounted on a movable body is provided with a radar device that calculates relative speeds and azimuth angles of plural reflecting points; an azimuth angle error estimating device that estimates an error of the azimuth angle calculated by the radar device based on the relative speeds and the azimuth angles of the plural reflecting points; and a correcting device that corrects the azimuth angle calculated by the radar device by using the azimuth angle error estimated by the azimuth angle error estimating device.