Radar Phase Noise Correction Using Frequency-Domain Combining
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Solution Overview
Problem
Radar systems, particularly bi-static and multi-static applications, are susceptible to phase noise due to phase offsets in signal reflections received at different stations, affecting efficiency and accuracy.
Innovation Solution
Implementing phase noise correction in the frequency domain through superposition and multiplication of radar signals, utilizing FFT processing and bi-static or multi-static beat-signals to reduce noise levels and enhance dynamic range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If bi-static or multi-static radar measurements are conducted between incoherent radio units, then phase coherent range and Doppler phase measurements can be achieved, but phase noise is introduced due to phase offsets in signal reflections received at different stations
Solution Approach 1:
The patent creates a virtual copy of the transmitted signal by receiving the reflection at a different station. The second radio unit receives the transmitted signal and generates a copy that is then used for mixing with the reflected signal at the first station, enabling phase coherent measurements while providing a reference for noise correction.
Solution Approach 2:
The patent introduces an intermediary processing step where the frequency-based representations from different receivers are superimposed and combined. This intermediary process acts as a mediator that separates the useful phase information from the harmful phase noise, allowing correction of the phase offsets while preserving the measurement accuracy.
2Object-affected harmful factors
If frequency-based representations from different receivers are processed using superposition and combining, then phase noise is corrected, but processing complexity increases
Solution Approach 1:
The patent replaces complex time-domain phase noise correction mechanisms with frequency-domain processing. By transforming the signals to the frequency domain using FFT, the system substitutes complicated temporal synchronization and phase tracking mechanisms with simpler frequency-based superposition and combining operations.
Solution Approach 2:
The patent changes the domain parameter from time to frequency, which fundamentally alters how phase noise is handled. In the frequency domain, phase noise appears as amplitude variations that can be corrected through superposition of frequency-based representations, simplifying the correction process compared to time-domain approaches.
Data Source
AI summary
Aspects of the present disclosure are directed to radar apparatuses and related methods. As may be implemented in connection with one or more embodiments, frequency-based representations of reflected radar signals received by different radar receivers are processed utilizing superposition of and combining of respective ones of the frequency-based representations. In response to said processing, phase noise in the frequency-based representations of reflected radar signals is corrected.