Multi-Carrier Radar Circuitry for Unambiguous Range Detection
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Solution Overview
Problem
Radar measurements suffer from measurement ambiguity due to the cyclic nature of radar signals, limiting the ability to process frames simultaneously and achieving high frame rates and virtual antenna channels necessary for automotive applications.
Innovation Solution
Utilizing radar determination circuitry that transmits and receives radar signals at two or more different frequencies simultaneously, employing phase-locked loops and different carrier frequencies to resolve ambiguity through the Chinese Remainder Theorem, allowing for simultaneous processing of frames and generating virtual arrays without compromising frame rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If radar measurements are performed using cyclic radar signals, then positional parameters can be determined, but measurement ambiguity occurs limiting the ability to process frames simultaneously
Solution Approach 1:
The patent segments the radar signal transmission into multiple carrier frequencies (first carrier frequency and second carrier frequency). By transmitting radar signals at different carrier frequencies simultaneously and processing the reflected signals separately, the system resolves measurement ambiguity while maintaining the ability to determine positional parameters accurately.
2Reliability
If traditional radar techniques are used, then measurement ambiguity is resolved by varying chirp repetition frequency, but frame rate and processing speed are limited
Solution Approach 1:
Instead of varying the chirp repetition frequency to resolve ambiguity, the patent changes the carrier frequency parameter. By transmitting radar signals at multiple carrier frequencies simultaneously and using the phase differences between these frequencies to resolve ambiguity, the system achieves both reliable measurement and high frame rates without the limitations of traditional frequency variation methods.
3Productivity
If multiple carrier frequencies are used simultaneously, then unambiguous parameter determination is achieved with increased frame rate, but device complexity increases
Solution Approach 1:
The patent merges the processing of multiple carrier frequency signals into a unified framework. By simultaneously transmitting radar signals at multiple carrier frequencies and combining the reflected signals through correlation processing with respective chirp signals, the system achieves unambiguous parameter determination with high frame rates while managing complexity through integrated signal processing.
Data Source
AI summary
The present disclosure generally pertains to radar determination circuitry configured to:obtain a first received radar signal representing a first transmitted radar signal reflected at a scene;obtain a second received radar signal representing a second transmitted radar signal reflected at the scene, whereinthe first transmitted radar signal and the second transmitted radar signal have a common chirp repetition frequency, and whereinthe first transmitted radar signal is based on a first carrier frequency and the second as transmitted radar signal is based on a second carrier frequency different from the first carrier frequency; anddetermine an unambiguous parameter based on the first and the second received radar signals.