Dual-Polarized MIMO Radar Interference Immunity
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Solution Overview
Problem
Radar systems face interference from other radar systems, particularly chirp radars, which can lead to signal saturation and reduced accuracy in determining range, velocity, and angle of objects, especially in environments with multiple transmitters and receivers.
Innovation Solution
The implementation of dual-polarization receive channels and improved signal handling dynamic range in the radar system to differentiate and filter out interfering signals, preventing saturation at the A-to-D converter stage and enhancing interference immunity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple transmitters and receivers are used to determine angular position and improve measurement capability, then measurement precision is improved, but interference from other radar systems increases causing signal saturation and reliability degradation
Solution Approach 1:
The patent segments the received signal into different polarization components using dual-polarization receive channels. By separating signals based on polarization orientation, the system can distinguish between desired targets and interfering radar signals, preventing saturation and maintaining reliable measurement even in multi-radar environments
Solution Approach 2:
The patent changes the polarization parameter of the receive channels to match or mismatch the transmitted signal polarization. This parameter differentiation allows the system to filter out interfering signals from other radar systems while maintaining sensitivity to desired targets, resolving the contradiction between measurement precision and reliability
2Reliability
If dual polarization receive channels are implemented to filter interfering signals, then interference immunity is improved, but device complexity increases
Solution Approach 1:
The dual-polarization receive channels serve multiple functions: they receive desired target signals, reject interfering radar signals through polarization discrimination, and provide polarization information for target characterization. This multi-functionality justifies the increased device complexity by delivering enhanced interference immunity and measurement capability simultaneously
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 solution provides greater immunity to interference from other radar systems, reduces interference caused to others, and maintains accurate signal processing by avoiding saturation, thereby improving the radar system's ability to determine range, velocity, and angle of objects effectively.
Implementation Method 1
The transmitted signal is reflected off of object or targets in the environment. The received signal at each receiver is the totality of the reflected signal from all targets in the environment.
Implementation Method 2
A radar system can also estimate the velocity of the target by Doppler processing.
Implementation Method 3
The receive pipeline comprises exemplary dual polarization receive channels. The interfering radio signals are a different polarization than the radio signals transmitted by the transmitters and reflected from targets in the environment.
Data Source
AI summary
A radar system with a transmit pipeline transmitting radio signals, and with a receive pipeline receiving radio signals including radio signals transmitted by own transmitters and reflected from objects in an environment, and interfering radio signals transmitted by other radar systems. The receive pipeline provides interference immunity from interfering radio signals transmitted by other radar systems. The transmit pipeline and/or the receive pipeline avoid transmitting radio signals that interfere with the other radar systems. The receive pipeline includes dual polarization receive channels. The interfering radio signals are a different polarization than the radio signals transmitted by own transmitters and reflected from targets in the environment. The receive pipeline provides improved signal handling dynamic range to avoid receive channels saturating at A-to-D converter stage before the radio signal has reached the digital signal processing domain.