Distributed Radar IC Signal Processing for Angular Resolution
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Solution Overview
Problem
Automotive radar systems face challenges in increasing angular resolution and elevation requirements due to the limited number of RF pins on Monolithic Microwave Integrated Circuits (MMICs), necessitating improved signal processing concepts for cascaded MMIC devices.
Innovation Solution
A distributed signal processing approach where multiple radar-ICs process receive signals from an antenna array independently to generate range-Doppler maps, exchanging only subregions of interest and phase information for further processing, reducing data transmission and enabling efficient load distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of receive channels in a radar system is increased to improve angular resolution and elevation requirements, then measurement precision is improved, but device complexity increases due to the limited number of RF pins on MMICs
Solution Approach 1:
The patent divides the antenna array into multiple sub-arrays, with each sub-array connected to a separate radar-IC. This segmentation allows the system to handle more receive channels than a single MMIC could support, as each radar-IC processes a subset of channels independently. The segmentation resolves the contradiction by enabling increased angular resolution through more channels without requiring a single complex MMIC with excessive RF pins.
Solution Approach 2:
The patent introduces a new dimension of processing by performing initial signal processing and range-Doppler map generation at multiple distributed radar-ICs before combining results. This dimensional approach to signal processing architecture allows the system to scale beyond the pin limitations of individual MMICs while maintaining high angular resolution capabilities.
2Measurement precision
If multiple cascaded MMIC devices are used to handle increasing numbers of receive channels, then measurement precision is improved, but loss of time increases due to data exchange requirements
Solution Approach 1:
The patent extracts and processes critical signal features (range-Doppler maps and subregions of interest) at each distributed radar-IC before exchanging data. This extraction approach minimizes the amount of data that needs to be transmitted between devices, reducing transmission time while maintaining the precision benefits of multiple channels.
Solution Approach 2:
Each radar-IC performs preliminary signal processing and generates range-Doppler maps locally before data exchange. This preliminary action reduces the computational burden during the data combination phase and minimizes transmission requirements, thereby reducing time loss while enabling the use of multiple channels for improved angular resolution.
3Measurement precision
If raw receive data is exchanged between multiple radar-ICs for spatial or angular information estimation, then measurement precision is improved, but loss of information decreases less efficiently due to large data volumes
Solution Approach 1:
The patent extracts only the essential information (subregions of interest from range-Doppler maps) for exchange between radar-ICs, rather than transmitting complete raw data sets. This extraction maintains the precision needed for spatial and angular information estimation while dramatically reducing data exchange volumes.
Solution Approach 2:
The patent processes and exchanges only the partial information necessary for spatial/angular estimation (subregions of interest) rather than complete data sets. This partial action approach maintains measurement precision while minimizing information loss during data exchange between distributed devices.
Data Source
AI summary
The present disclosure relates to a radar device including a first radar-IC for processing first receive signals from first antennas of an antenna array, wherein the first radar-IC is configured to determine a first range-Doppler map based on the first receive signals, and to determine a first subregion of the first range-Doppler map based on criteria of interest. The radar device also includes at least a second radar-IC for processing second receive signals from second antennas of the antenna array, wherein the second radar-IC is configured to determine a second range-Doppler map based on the second receive signals, and to determine a second subregion of the second range-Doppler map based on the criteria of interest. A data interface is configured to forward information indicative of the first and/or the second subregions to a common processor for further processing.