Radar Phase Adjustment for Dynamic Range Optimization
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Solution Overview
Problem
Conventional radar systems operating in full duplex mode with a single antenna face limitations in dynamic range due to self-interference, requiring a 6 dB back-off, which reduces the detection range by about 50% and limits the signal power control for analog-to-digital converters (ADCs) in I/Q receivers.
Innovation Solution
The method involves determining the maximal amplitude and phase of received signals and adjusting the phase or amplifying the signal to optimize the dynamic range of the radar system, allowing for full swing operation of ADCs without back-off, by setting the phase to approximately 45 degrees in the I/Q diagram and uniformly amplifying both the I and Q branches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a 6 dB back-off is applied to avoid clipping in full duplex radar systems, then self-interference is managed, but the dynamic range is reduced by about 50% and detection range is limited
Solution Approach 1:
The patent implements dynamic phase and gain adjustment mechanisms that adapt in real-time to signal conditions. The receiving unit dynamically modifies the phase of received signals and adjusts gain levels to optimize the distribution of signal power between I and Q branches, enabling the system to operate at full dynamic range without fixed back-off limitations
Solution Approach 2:
The system changes key parameters including phase angle (optimizing to approximately 45 degrees in the I/Q diagram) and gain levels. By adjusting these parameters dynamically based on signal characteristics, the system maximizes the utilization of ADC dynamic range while maintaining reliable operation in full duplex mode
2Ease of operation
If a significant RX gain step size (e.g., 3 dB) is used in conventional I/Q receivers, then automatic gain control is simplified, but the signal power cannot be controlled finely enough to operate ADCs in full swing
Solution Approach 1:
The patent replaces static gain steps with dynamic, continuous gain adjustment. The system continuously adapts gain levels based on real-time signal power measurements and phase conditions, enabling fine-grained control of signal power to fully utilize ADC dynamic range without being constrained by fixed gain step sizes
Solution Approach 2:
The system implements feedback mechanisms where the receiving unit continuously monitors signal characteristics and adjusts phase and gain accordingly. This closed-loop control enables precise signal power control by feeding back information about ADC utilization and signal distribution to the adjustment mechanisms
Data Source
AI summary
The dynamic range of the output of a radar system with a transmitter and receiver can be optimized by determining the phase of a radar reflection signal at the receiver and adjusting the phase so that the in-phase and quadrature components of the signal have equal amplitudes. The phase can be adjusted at the receiver or by adjusting the phase of the output signal at the transmitter.