Radar Azimuth Angle Correction via Beat Frequency Verification
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Solution Overview
Problem
Conventional radar apparatuses using super-resolution angle measuring processing often incorrectly determine the azimuth angle of one target object when the beat frequencies of multiple objects coincide, leading to incorrect relative speed and distance calculations for both objects.
Innovation Solution
A radar apparatus that performs other-signal detection processing to identify and eliminate incorrect azimuth angles by searching for targets with matching beat frequencies and angles, prioritizing continuous detection data to ensure accurate angle measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If super-resolution angle measuring processing is performed using beat signal frequency components from multiple targets, then azimuth angle measurement precision is improved, but incorrect azimuth angles from other targets are mistakenly obtained
Solution Approach 1:
The patent applies feedback by using the detected azimuth angles and beat frequencies as verification criteria. The processing feedbacks on the input signal vectors by checking whether obtained azimuth angles correspond to actual target positions, and eliminates incorrect angles through this feedback mechanism, thereby resolving the contradiction between measurement precision and reliability.
Solution Approach 2:
The patent introduces beat frequency as an intermediary parameter to distinguish correct from incorrect azimuth angles. By using beat frequency coincidence as a verification criterion, the system can identify which azimuth angles correspond to actual targets, thus resolving the contradiction between obtaining multiple angles for precision and ensuring correctness.
2Device complexity
If beat frequencies of multiple target objects coincide, then signal processing becomes simpler, but incorrect relative speed and distance calculations occur
Solution Approach 1:
The system uses feedback by verifying whether obtained relative speed and distance values correspond to actual target characteristics. When beat frequencies coincide, the feedback mechanism checks multiple candidate targets and eliminates incorrect measurements, thereby maintaining measurement precision while handling simplified signal processing.
Solution Approach 2:
The patent changes parameters by introducing azimuth angle as an additional verification parameter. When beat frequencies coincide, the system uses azimuth angle differences to distinguish between correct and incorrect target associations, thus preventing incorrect speed and distance calculations while maintaining processing simplicity.
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
Enables the correct azimuth angle of a target object to be obtained even when multiple objects are present, preventing incorrect angle and distance calculations by distinguishing and eliminating erroneous angles based on beat frequency and power analysis.
Implementation Method 1
transmits through a transmission antenna a radio wave whose frequency is modified in a temporally increasing and decreasing manner
Implementation Method 2
measures by use of a calculation device a relative speed and an azimuth angle of the target object and a distance between the target object and the radar, based on a beat signal generated by mixing a transmission wave with a reception wave
Data Source
AI summary
A radar apparatus measures an azimuth angle with a calculation device that performs super-resolution angle measuring processing in which relative speeds and relative distances among target objects are calculated, when two azimuth angles are obtained for a given target object that has been detected, the calculation device performs an other-signal detection processing in which, among other detected target objects, a target object is searched whose azimuth angle is the same as one of the two azimuth angles and whose beat frequency upon frequency-increasing modification or frequency-decreasing modification is the same as that of the given target object; and when, through the other-signal detection processing, another target object that satisfies the condition is detected, the calculation device eliminates one of two azimuth angles of the detected given target object, which is equal to the azimuth angle of said another target object detected through the other-signal detection processing.