Radar Receiver Phase Compensation for Accurate AoA Measurement
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Solution Overview
Problem
Conventional radar systems face challenges in accurately determining the angle of arrival (AoA) due to device-specific variations in receiver delays and gains, leading to PDoA distortion and incorrect AoA results, which conventional calibration methods fail to adequately address.
Innovation Solution
Compensate for receiver-specific variations by utilizing self-interference phases to subtract the self-interference peaks from target peaks, allowing for direct comparison of compensated target phases without calibration, thereby enabling precise positional measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional radar systems use multiple receivers to determine angle of arrival, then positional information can be obtained, but receiver-specific delay variations cause PDoA distortion and incorrect AoA results
Solution Approach 1:
The patent converts the harmful self-interference signal into a useful reference for compensation. By detecting the self-interference peak in the channel impulse response, the system obtains a reference that experiences the same receiver-specific delay variations as the target signal. This reference is then used to compensate for these variations, transforming the previously harmful interference into a beneficial calibration source that improves PDoA measurement reliability.
Solution Approach 2:
The self-interference peak serves as an intermediary reference signal between the receiver hardware variations and the target measurement. This intermediary experiences the same receiver-specific delays as the target signal but has a known, detectable position in the CIR, allowing the system to measure and compensate for receiver variations without directly measuring the target's true position.
2Measurement precision
If calibration methods are used to compensate for receiver variations, then measurement accuracy can be improved, but system complexity and memory requirements increase
Solution Approach 1:
The radar system performs self-calibration using its own transmitted signal and the resulting self-interference at the receivers. The system generates its own calibration reference (the self-interference peak) and uses it to compensate for its own receiver variations, eliminating the need for external calibration equipment, complex calibration procedures, or additional calibration memory storage.
Solution Approach 2:
The system changes the approach from storing complex calibration parameters to using a simple time-domain reference peak detection. Instead of managing complex calibration data structures and additional memory, the system detects the self-interference peak position in the channel impulse response and uses this simple temporal reference to compute compensation factors, significantly reducing system complexity and memory requirements.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach provides accurate AoA determination by compensating for receiver variations, reducing system complexity and eliminating the need for calibration, thus improving positional accuracy and reducing memory requirements.
Implementation Method 1
a transmitter emits an RF signal towards the target, while one or more receivers obtain a reflection (an echo) of the RF signal that has been reflected by the target
Implementation Method 2
the time it takes for the reflection to arrive at each antenna will not only comprise a common delay but also a delay difference
Data Source
AI summary
A radar device includes a transmitter configured to transmit an RF signal, a first receiver configured to receive a first reflection of the RF signal, a second receiver configured to receive a second reflection of the RF signal, and a control device configured to determine a first target phase and a first self-interference phase (Φ1SI) with respect to the first reflection of the RF signal. The radar device compensates for a first variation in the first target phase based on the first self-interference phase to obtain a compensated first target phase, determines a second target phase and a second self-interference phase with respect to the second reflection of the RF signal, and compensates for a second variation in the second target phase based on the second self-interference phase to obtain a compensated second target phase.