Master-Slave MIMO Radar Synchronization via Frequency Modulation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional synchronization methods for spatially distributed MIMO radar systems, such as those used in vehicles, are limited by the need for a single signal source equidistant from all systems, which restricts placement and leads to phase coherency loss over distances greater than a few meters.
Innovation Solution
Designating one MIMO radar system as a master with a linear frequency modulator and others as slaves, using a synchronization signal at a lower frequency to determine time delays through cable lengths, allowing for coherent processing of reflections across distributed systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single signal source is used for synchronization, then phase coherency is maintained among MIMO radar systems, but the placement of MIMO radar systems is restricted and requires the signal source to be equidistant from all systems
Solution Approach 1:
The system divides the MIMO radar network into a master system and slave systems. The master system generates the synchronization signal while slave systems receive and follow it, allowing distributed placement without requiring equidistant positioning from a central source.
Solution Approach 2:
Instead of having a central signal source equidistant from all systems, the invention designates one MIMO radar system as the master that generates the signal, and other systems as slaves that receive it. This inverts the conventional approach and enables flexible spatial distribution.
2Adaptability or versatility
If MIMO radar systems are placed far apart to achieve spatial distribution, then placement flexibility is improved, but phase coherency is lost over distances greater than a few meters
Solution Approach 1:
The master MIMO radar system acts as an intermediary that generates and distributes the synchronization signal to all slave systems through cable connections, maintaining phase coherency regardless of the physical distance between distributed systems.
3Device complexity
If conventional synchronization methods are used, then equipment complexity is reduced, but the system requires equidistant placement which limits operational versatility
Solution Approach 1:
One of the MIMO radar systems itself serves as the synchronization source for the other systems. The master system's linear frequency modulator provides the synchronization signal to slave systems, eliminating the need for separate external synchronization equipment while enabling flexible placement.
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 effective synchronization and coherent processing of reflections across spatially distributed MIMO radar systems, improving obstacle detection and collision avoidance capabilities without the limitations of conventional methods.
Implementation Method 1
designating one of the plurality of MIMO radar systems that includes a linear frequency modulator as a master MIMO radar system
Implementation Method 2
mixing, using a mixer, the return signal from each of the slave MIMO radar systems with the synchronization signal and filtering an output of the mixer to isolate a difference between the synchronization signal and the respective return signal
Data Source
AI summary
A method of synchronizing a plurality of spatially distributed multi-input multi-output (MIMO) radar systems includes designating one of the plurality of MIMO radar systems that includes a linear frequency modulator as a master MIMO radar system, and designating each of the other plurality of MIMO radar systems as slave MIMO radar systems. Each of the slave MIMO radar systems receives an output of the linear frequency modulator. A synchronization signal is sent from the linear frequency modulator through the modulator splitter to each of the slave MIMO radar systems over respective cables, and a return signal is sent from each of the slave MIMO radar systems to the master MIMO radar system over the respective cables. A time delay is determined between the master MIMO radar system and each of the slave MIMO radar systems based on a frequency difference between the synchronization signal and the respective return signal.