Radar Target Simulator Antenna Isolation for Ghost Signal Reduction
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Solution Overview
Problem
Existing radar emulators for automotive radar systems suffer from signal leakage and crosstalk issues, leading to erroneous 'ghost' signals and compromised accuracy in simulating complex driving environments.
Innovation Solution
A miniature radar target simulator (MRTS) system with a receive antenna, variable gain amplifier, in-phase-quadrature mixer, variable attenuator, and an isolation structure to reduce crosstalk between transmit and receive antennas, effectively minimizing interference and enhancing simulation accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple re-illuminators are placed to emulate multiple targets, then the ability to simulate complex driving environments is improved, but signal leakage between transmit and receive parts causes erroneous ghost signals
Solution Approach 1:
The re-illuminator is divided into multiple independent re-illuminator elements, each with separate transmit and receive antenna pairs. This segmentation allows each element to operate independently, reducing signal leakage between elements and eliminating ghost signals while maintaining the ability to simulate multiple targets simultaneously.
Solution Approach 2:
The transmit and receive antenna pairs are extracted and positioned in separate physical locations. By separating the transmit antenna from its corresponding receive antenna and placing them at different positions, the system eliminates signal leakage paths that would otherwise create ghost signals, while still achieving multiple target emulation through coordinated operation of multiple extracted antenna pairs.
2Adaptability or versatility
If re-illuminators are used to emulate targets, then radar system testing capability is improved, but crosstalk between transmit and receive parts compromises measurement accuracy
Solution Approach 1:
The system transitions from a single-plane antenna arrangement to a three-dimensional spatial configuration. By positioning transmit and receive antenna pairs at different locations in space and using multiple re-illuminator elements distributed in different positions, the system achieves signal isolation through spatial separation, eliminating crosstalk while maintaining testing capability.
3Device complexity
If a single re-illuminator is used, then device complexity is reduced, but the ability to emulate multiple targets is limited
Solution Approach 1:
Each re-illuminator element is designed as a universal module capable of independently emulating a target at any desired position and with any desired characteristics. By creating multiple identical universal modules rather than complex single-unit systems, the achievement of multiple target emulation is simplified while maintaining manageable device complexity through modular repetition.
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
The MRTS system significantly reduces 'ghost' targets and errant signals, improving the accuracy of radar system testing by minimizing crosstalk and leakage, thereby enhancing the reliability and performance of radar emulators.
Implementation Method 1
an isolation structure adapted to reduce crosstalk between the receive antenna and the transmit antenna
Data Source
AI summary
A miniature radar target simulator (MRTS) and a system comprising a plurality of MRTS's are described. The MRTS and system are useful for emulating echo signals for a radar DUT with reduced interference. Illustrative radar test systems desirably generate the intended (emulated) radar targets and reduce unwanted (“ghost”) signals, which can result in “ghost targets,” and errant/ambient electromagnetic radiation that reduces the performance and reliability of known re-illuminators and systems including same.