FMCW Radar Channel Compensation for Unequal Path Delays
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Solution Overview
Problem
In FMCW radar systems with multi-antenna transceiving technology, unequal feeding path lengths between transceiving antennas lead to relative time delays, reducing signal quality and transceiving performance due to inconsistent antenna design and routing.
Innovation Solution
A signal processing method for FMCW radar with unequal path lengths, involving a reference receiving channel and additional channels, compensates digital baseband signals based on path length differences and frequency information to improve signal quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If unequal feeding path lengths are used for transceiving antennas, then antenna design and routing become simpler with lower inter-antenna coupling, but relative time delays occur between receiving channels reducing signal quality
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing compensation values for different path length differences before actual signal processing. The system determines compensation values based on known path length differences between receiving channels, and these pre-computed values are then applied during signal reception to eliminate time delay effects. This allows the system to benefit from unequal path lengths (simpler antenna design) while maintaining signal quality through pre-prepared compensation mechanisms.
2Reliability
If same antenna feeding path length is designed for different transceiving antennas, then signal quality is maintained, but antenna design becomes increasingly difficult with higher inter-antenna coupling
Solution Approach 1:
The patent converts the harmful effect of unequal path lengths (which causes time delays and reduces signal quality) into a beneficial situation. By deliberately allowing unequal path lengths for simpler antenna design, the system then applies digital signal processing compensation to not only restore but optimize performance. The compensation mechanism transforms the previously harmful path length difference into a manageable parameter that can be corrected, thereby achieving both simple antenna design and high signal quality.
3Reliability
If path length differences between receiving channels are compensated, then signal quality and transceiving performance improve, but processing complexity increases
Solution Approach 1:
The patent applies parameter changes by transforming the time delay compensation problem into a phase adjustment problem in the frequency domain. Instead of complex time-domain processing, the system converts received signals to frequency domain representation and applies phase shifts based on path length differences. This parameter transformation simplifies the compensation operation from complex temporal processing to relatively straightforward phase multiplication, thereby improving transceiving performance while minimizing processing complexity.
Data Source
AI summary
Disclosed in the present application are a signal processing method and link, and a target detection method and an electronic device. For an FMCW radar having at least two receiving channels and unequal-length lines, the unequal-length receiving of a digital baseband signal is compensated for in a digital domain according to a length difference between the receiving channels, such that the problem of the generation of a relative time delay between different receiving channels which is inevitably caused by a line length difference, is eliminated, thereby improving the signal receiving quality, and further improving the receiving performance.