Symmetric Bistatic Radar Beat-Signal Correction to Reduce Phase Noise
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Solution Overview
Problem
Existing radar systems face challenges in reducing phase noise, particularly in bistatic radar arrays, which affect the accuracy of distance and velocity measurements, especially in applications requiring detection of moving objects at higher speeds and distances.
Innovation Solution
A method involving the use of linear antenna arrays with phase estimation correction terms generated by multiplying beat signals with complex conjugates, applied to radar return signals to reduce phase noise, while preserving direction information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If phase noise reduction techniques are applied to bistatic radar arrays, then measurement precision of distance and velocity is improved, but device complexity increases due to additional signal processing operations
Solution Approach 1:
The phase noise correction process is segmented into distinct operational stages: generating beat signals from received radar returns, computing phase differences between symmetric antenna pairs, calculating correction terms, and applying corrections to range and velocity measurements. This segmentation allows each processing stage to be optimized independently and facilitates implementation in existing radar systems without complete redesign.
Solution Approach 2:
The patent applies preliminary phase noise correction by computing correction terms from beat signals before final range and velocity measurements are made. The phase correction terms are calculated in advance using symmetric antenna array geometry, then applied to subsequent measurements, thereby improving measurement precision without adding complexity to the core measurement algorithm.
2Reliability
If additional signal processing operations are performed to reduce phase noise, then reliability of radar measurements is improved, but processing time increases
Solution Approach 1:
The patent merges phase noise correction operations with existing radar signal processing by utilizing the same antenna arrays and signal paths already present in bistatic radar systems. The correction terms are computed using the existing beat signal generation process, and corrections are applied within the current measurement framework, thereby improving reliability without requiring separate dedicated processing time.
Data Source
AI summary
Phase noise reduction is described for symmetric bistatic radar. In one example, a first beat signal is generated of a second signal received at a first antenna and a third beat signal is generated at a second antenna of a first linear antenna array. A second beat signal is generated of a first signal received at a first antenna of a second linear antenna array. The first beat signal and the third beat signal are multiplied with the complex conjugate of the second beat signal to generate products that are combined to generate a phase estimation correction term that is applied to first and second sets of radar return signals.