UWB Radar Clock Alignment for Frequency and Sync Error Correction
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Solution Overview
Problem
UWB radar devices face challenges in maintaining spatial resolution due to sampling frequency errors and synchronization errors between antenna circuits, which arise from component deviations and affect the phase accuracy of signals.
Innovation Solution
The UWB radar device incorporates a controller that detects and corrects frequency errors and synchronization errors between first and second antenna circuits by generating synchronization signals and interpolating sampling data in the time domain to align clock signals and sampling times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple antenna circuits are used to increase spatial resolution, then the spatial resolution is improved, but phase errors occur due to component deviation causing frequency and synchronization errors
Solution Approach 1:
The system measures the actual operating frequencies of each antenna circuit using frequency counters, compares them to reference values, and generates correction values to compensate for deviations. This feedback mechanism continuously monitors and corrects phase errors caused by component variations, maintaining measurement precision across multiple antenna circuits.
Solution Approach 2:
The system dynamically adjusts operational parameters (correction values) for each antenna circuit based on measured frequency deviations. By changing the timing parameters and synchronization signals according to actual component performance, the system compensates for manufacturing variations and maintains phase accuracy.
2Ease of manufacture
If component deviations are present in antenna circuits, then manufacturing cost is reduced by using identical components, but operating speed and latency differ causing phase errors
Solution Approach 1:
Each antenna circuit autonomously measures its own operating frequency using integrated frequency counters and generates its own correction values. The system performs self-diagnosis and self-correction, eliminating the need for manual calibration and compensating for component variations automatically.
Solution Approach 2:
The system implements continuous monitoring of each antenna circuit's operating characteristics and automatically adjusts synchronization signals based on measured deviations. This feedback loop ensures that standardization benefits are maintained while compensating for individual component variations.
3Measurement precision
If sampling frequency errors occur between antenna circuits, then spatial resolution degrades, but correction mechanisms increase device complexity
Solution Approach 1:
The controller performs multiple functions: it generates synchronization signals, measures frequencies, calculates correction values, and adjusts timing parameters. By consolidating these functions into a single control unit, the system avoids the complexity of separate dedicated circuits for each function while maintaining spatial resolution.
Solution Approach 2:
The system introduces synchronization signals and correction values as intermediary elements that mediate between the independent antenna circuits. These intermediaries coordinate the operation of multiple circuits without requiring complex direct interconnections, simplifying the overall system architecture.
Data Source
AI summary
Disclosed is an ultra-wide band (UWB) radar device including a first antenna circuit including a first transmission circuit, a first reception circuit, a first oscillator that supplies a first clock signal to the first transmission circuit and the first reception circuit, and a first frequency counter, a second antenna circuit including a second transmission circuit, a second reception circuit, a second oscillator that supplies a second clock signal to the second transmission circuit and the second reception circuit, and a second frequency counter, and a controller that detects the target. The controller corrects a frequency error between the first clock signal and the second clock signal and compensates for a synchronization error between the first antenna circuit and the second antenna circuit.