Radar Phase Measurement Using Delay Element Superposition
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Solution Overview
Problem
Calibrating phase information in radar systems, particularly at Extremely High Frequency (EHF) ranges, is challenging due to the complexity of phase measurement across multiple antennas used in beamforming techniques.
Innovation Solution
A circuit and method involving a series of delay elements connected between input nodes to measure phase differences between RF oscillator signals, utilizing analog/digital converters and computing units to generate digital representations of amplitude values, enabling accurate phase calculation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If phase measurement is performed at EHF frequencies using multiple MMICs and antennas, then beamforming capability and direction of arrival measurement are enabled, but measurement precision deteriorates due to phase calibration challenges
Solution Approach 1:
The patent introduces a delay element as an intermediary component between the RF oscillator signal source and the mixing stage. This delay element serves as a mediator to compensate for phase differences in the RF signals received from multiple antennas, enabling accurate phase calibration at EHF frequencies without requiring complex direct measurement methods
Solution Approach 2:
The patent replaces direct mechanical or hardware-based phase measurement methods with a signal processing approach using delay elements and mixing. Instead of physically measuring phase at high frequencies which is challenging, the system uses intermediate frequency conversion and digital signal processing to determine phase relationships, substituting complex RF measurement mechanics with more manageable baseband processing
2Measurement precision
If direct phase measurement methods are used at EHF frequencies, then phase calibration can be performed, but device complexity increases due to the specialized hardware required
Solution Approach 1:
The patent changes the frequency parameter of the RF signal by mixing it with a local oscillator signal to convert it to an intermediate frequency or baseband signal. This parameter transformation allows phase measurement to be performed at lower, more manageable frequencies using standard components rather than specialized EHF measurement hardware
Solution Approach 2:
The local oscillator signal serves as an intermediary that facilitates the frequency conversion process. By introducing this intermediate signal, the system can indirectly measure phase relationships at EHF frequencies through the converted intermediate frequency signals, avoiding the need for complex direct EHF phase measurement hardware
Data Source
AI summary
A method for determining phase information in a radar system comprises receiving a first RF oscillator signal at a first input node and receiving a second RF oscillator signal at a second input node, wherein an arrangement having a multiplicity of delay elements is connected between the first input node and the second input node, and wherein corresponding RF signals representing a superposition of first RF oscillator signal and second RF oscillator signal are present at different positions of the arrangement. The method further comprises generating measurement values representing the amplitudes of the RF signals, generating digital representations of the measurement values, and calculating a relative phase value, representing the difference between the phase of the second RF oscillator signal and the phase of the first RF oscillator signal, on the basis of the digital representations of the measurement values.