Unsynchronized Radar Object Tracking via Carrier Phase Comparison
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Solution Overview
Problem
Existing object tracking technologies face challenges in accurately determining the position and motion of objects using unsynchronized distance sensors without phase-locked loop (PLL) techniques, particularly when sensors operate at different frequencies, such as 5 GHz and 60 GHz, and synchronizing carrier phases across multiple radars is difficult.
Innovation Solution
A system comprising unsynchronized distance sensors and a processor that determines distance values and carrier phase values from each sensor, compares these values to determine the range and granular positions of an object within a common coverage area, and takes action based on the comparisons, without requiring synchronization of carrier waves or PLL techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If multiple distance sensors operate at different frequencies without synchronization, then system flexibility and ease of operation are improved, but measurement precision and reliability of carrier phase comparison deteriorate
Solution Approach 1:
The system performs preliminary actions by recording multiple distance measurements and carrier phase values from unsynchronized sensors before attempting to determine object position. The processor stores these measurements with their corresponding timestamps and then performs post-processing to identify consistent position data across multiple sensor readings, eliminating the need for real-time synchronization.
Solution Approach 2:
The processor acts as an intermediary that receives and reconciles data from multiple unsynchronized sensors operating at different frequencies. It performs cross-correlation and comparison of carrier phase values from different sensors to identify matching positions, effectively mediating between the unsynchronized sensor outputs to produce accurate position determination.
2Measurement precision
If carrier phase synchronization is implemented across multiple radars, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The system extracts and separates the carrier phase comparison function from the sensor operation itself. Instead of requiring sensors to be synchronized during operation, the processor extracts carrier phase values from each sensor's independent measurements and performs comparison in post-processing, removing the complexity of synchronization hardware and control circuits.
Solution Approach 2:
The system performs preliminary data collection from unsynchronized sensors, storing multiple distance measurements and carrier phase values with timestamps. The actual position determination and carrier phase comparison are performed as preliminary actions in post-processing, allowing accurate position tracking without real-time synchronization infrastructure.
3Measurement precision
If PLL techniques are used for sensor synchronization, then measurement precision is improved, but device complexity and ease of manufacture worsen
Solution Approach 1:
The system replaces the mechanical/electrical synchronization system (PLL circuits, phase-locked loop hardware) with a software-based post-processing approach. The processor uses algorithmic comparison of carrier phase values from unsynchronized sensors, substituting complex hardware synchronization mechanisms with simpler computational methods that achieve the same measurement precision.
Solution Approach 2:
The processor serves as an intermediary that reconciles measurements from unsynchronized sensors without requiring PLL techniques. It performs cross-correlation of carrier phase values and identifies consistent position data across sensors, eliminating the need for complex synchronization hardware while maintaining measurement accuracy.
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
Enables accurate tracking of objects across multiple sensors with different frequencies, allowing for precise determination of object positions and motion without the need for PLL synchronization, improving the efficiency and flexibility of object tracking systems.
Implementation Method 1
the carrier phase values correspond to a plurality of carrier waves reflected by the object
Data Source
AI summary
This disclosure enables various technologies involving various actions based on tracking an object via a plurality of distance sensors, without synchronizing carrier waves of the distance sensors or without employing a PLL technique on the distance sensors.