Radar Beam Controller Segmentation for Doppler Resolution
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Solution Overview
Problem
Conventional radar devices face challenges in maintaining Doppler frequency resolution while shortening the beam scanning period, particularly when detecting targets at high speeds, due to limitations in coherent integration and Fourier transform processing.
Innovation Solution
A radar device with a transmission beam controller that selects and switches between multiple transmission beam sets, each containing at least two beams with different directions, allowing for coherent integration and Doppler frequency analysis within specific periods to optimize scanning efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If coherent integration processing is performed for a long period to improve Doppler frequency resolution, then measurement precision is improved, but beam scanning period is extended and productivity deteriorates
Solution Approach 1:
The patent divides the beam scanning process into multiple sets, where each set contains multiple beams with different directions. The transmission beam controller switches between these beam sets, allowing Doppler frequency analysis to be performed on a subset of beams within each set. This segmentation enables the system to maintain high Doppler frequency resolution by processing beams in groups rather than requiring long continuous integration, thus shortening the overall beam scanning period while preserving measurement precision.
2Productivity
If beam scanning period is shortened to improve productivity, then productivity is improved, but Doppler frequency resolution deteriorates
Solution Approach 1:
The patent segments the beam scanning process into multiple beam sets, each containing multiple beams. By performing coherent integration and Doppler frequency analysis on a subset of beams within each set rather than requiring full integration across all beams, the system achieves shortened beam scanning periods while maintaining adequate Doppler frequency resolution through the structured processing of beam subsets.
Solution Approach 2:
The transmission beam controller periodically switches between different beam sets in a systematic manner. This periodic switching allows the radar system to perform coherent integration over multiple periods, accumulating sufficient signal for high-resolution Doppler frequency analysis while maintaining a shorter overall scanning period through the efficient periodic reuse of beam sets.
3Adaptability or versatility
If multiple transmission beam sets are used to cover wide-angle range, then adaptability is improved, but device complexity increases
Solution Approach 1:
The patent segments the wide-angle detection capability into multiple transmission beam sets, where each set contains multiple beams with different directions. The transmission beam controller is designed to systematically switch between these pre-defined sets, managing complexity through structured organization. This segmentation allows the system to achieve wide-angle coverage by combining multiple focused beams while keeping the controller logic manageable through the systematic nature of beam set switching.
Data Source
AI summary
A radar device includes: a transmission beam controller that selects, every first period, a transmission beam set used for transmission of a radar signal from among a plurality of transmission beam sets each including at least two transmission beam directions; and a radar transmitter that transmits the radar signal in a predetermined transmission period by using the selected transmission beam set, wherein the transmission beam controller switching, every second period within the first period, among the at least two transmission beam directions included in the transmission beam set.