FMCW Radar Signal Content Embedding and Dispersion Compensation
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Solution Overview
Problem
Radar systems face challenges in achieving high resolution and long measurement range while maintaining desirable radar operation, particularly in environments where data communication within signals is complex and prone to interference, leading to congestion in the frequency spectrum.
Innovation Solution
The implementation of receiver circuitry and signal processing techniques that embed a content signal into a FMCW radar waveform, utilizing a filter to account for time delay and dispersion, allowing for the removal of the embedded signal by introducing a dispersion-related function, thereby mitigating residual errors and maintaining radar performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If data communication is embedded within radar signals, then spectrum usage efficiency is improved, but signal processing complexity increases
Solution Approach 1:
The patent segments the radar signal processing into distinct functional blocks: a communication signal processing unit that extracts and processes embedded communication signals, and a radar signal processing unit that handles radar-specific processing. This segmentation allows independent optimization of each processing path, reducing overall system complexity while maintaining spectrum efficiency.
Solution Approach 2:
The patent introduces an intermediary filtering stage that separates communication signals from radar signals before further processing. This intermediary filter acts as a mediator that prevents communication signal components from interfering with radar signal processing, thereby reducing processing complexity while enabling efficient spectrum usage.
2Measurement precision
If high resolution and long measurement range are achieved, then radar performance is improved, but signal dispersion and residual errors increase
Solution Approach 1:
The patent applies preliminary filtering and dispersion compensation to communication signals before they are fully processed. By pre-processing these signals to account for expected dispersion effects, the system maintains signal accuracy even when achieving high resolution and long measurement ranges, thereby preventing residual errors from degrading reliability.
Solution Approach 2:
The patent implements feedback mechanisms where processing results are used to adjust and refine subsequent processing stages. This feedback loop allows the system to compensate for signal dispersion and residual errors dynamically, maintaining both high measurement precision and signal reliability simultaneously.
3Productivity
If content signal is embedded into radar waveform, then communication capability is improved, but radar signal processing becomes more challenging
Solution Approach 1:
The patent divides the received signal into communication signal components and radar signal components through dedicated processing paths. The communication signal processing block is specifically designed to extract and process embedded content signals, while the radar signal processing block handles traditional radar functions. This segmentation reduces the difficulty of processing by treating each signal type with appropriate specialized algorithms.
Solution Approach 2:
The patent extracts communication signals from the composite radar-communication signal using dedicated extraction circuits and algorithms. By separating the communication content from the radar waveform, the system improves communication capability while reducing the complexity of subsequent radar signal processing, as the communication components are removed before radar-specific processing occurs.
Data Source
AI summary
A method and apparatus are provided in which receiver circuitry and signal processing circuitry may reside. The receiver circuitry receives a FMCW radar signal having a content signal (e.g., a random or information signal) embedded into a radar waveform and indicating a relationship in the FMCW radar signal between beat frequency and time delay. The signal processing circuitry may apply a filter (e.g., filtering with a group delay that approximates or relates to the relationship) that causes a residual error in, due to dispersion of, the content signal, and may account for (e.g., mitigate) the residual error by introduction of a dispersion-related function in further processing of the content signal.