FMCW Radar Leakage Cancellation via Dynamic Signal Adjustment
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Solution Overview
Problem
FMCW radar systems face reduced measurement precision due to leakage signals, especially when transmission and reception systems are closely arranged, as existing methods fail to completely cancel these signals when their amplitude and phase vary with transmission frequency, particularly affecting short-distance measurements.
Innovation Solution
An FMCW radar system that adjusts the amplitude and phase of a cancel signal in real-time to match the variations in the leakage signal component, allowing it to effectively cancel out the leakage signal by superimposing the adjusted cancel signal over the received signal, thereby preventing interference with measurement precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the transmission and reception systems are arranged close to each other to decrease the overall size, then the compactness is improved, but the measurement precision deteriorates due to increased leakage signal interference
Solution Approach 1:
The patent converts the harmful leakage signal into a beneficial cancellation tool by generating a synthetic leakage signal that mirrors the actual leakage characteristics. This synthetic signal is then subtracted from the received signal, transforming the previously harmful interference into a precise cancellation mechanism that enables accurate distance measurement even in compact configurations
Solution Approach 2:
The patent introduces a leakage signal generator as an intermediary component that creates a model of the leakage signal. This intermediary entity allows the system to predict and cancel leakage effects without physically separating the transmission and reception systems, enabling compact design while maintaining measurement precision
2Device complexity
If a DC component removal circuit is used to cancel the leakage signal component, then the leakage cancellation is simplified, but the measurement precision deteriorates due to removal of low frequency components near DC
Solution Approach 1:
The patent changes the approach from frequency-domain DC removal to time-domain synthetic signal cancellation. By generating a leakage signal that matches the actual leakage in amplitude and phase characteristics, the system cancels leakage across all frequency components including low frequencies, avoiding the precision loss inherent in DC component removal methods
3Stability of the object's composition
If the amplitude and phase of the cancel signal are fixed, then the system stability is improved, but the leakage cancellation effectiveness deteriorates when transmission frequency varies
Solution Approach 1:
The patent implements dynamic adjustment of the cancel signal by making its amplitude and phase characteristics dependent on the transmission frequency. The leakage signal generator continuously adapts the cancel signal parameters to match the current operating frequency, ensuring effective leakage cancellation across the entire frequency range while maintaining system stability through controlled adaptation
Data Source
AI summary
Disclosed herein is a frequency modulated continuous wave (FMCW) radar. The FMCW radar includes: a transmission signal generator that generates a frequency-modulated transmission signal; a transmission signal sender that sends the transmission signal; a receiver that receives a reflected wave of the transmission signal; an adjuster that adjusts the amplitude and phase of a cancel signal, which cancels a leakage signal component in a received signal, in accordance with a variation in the frequency of the transmission signal; and a superimposer that superimposes the cancel signal over the received signal to cancel the leakage signal component.