MIMO Radar Spillover Cancellation via Signal Routing
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Solution Overview
Problem
In multiple input multiple output (MIMO) radar systems, calculating the interference patterns to ensure spillover signal power above a certain threshold for each receiver subsystem is complex and often impossible, especially when transmit-receive pairs are independently excited with different phases, leading to difficulties in determining the optimal placement of subsystems to achieve effective spillover cancellation.
Innovation Solution
A method involving routing a part of the transmitted signal to the receiver subsystem to increase the spillover signal power, allowing the spillover cancellation subsystem to cancel both the spillover and transmitted signals, thereby ensuring a high enough power level for correct functioning, and optionally delaying the transmitted signal to match the spillover signal delay for improved correlation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If transmit-receive pairs are independently excited with different phases in a MIMO radar system, then the radar system achieves improved measurement precision and versatility, but the complexity of calculating interference patterns to ensure sufficient spillover signal power becomes extremely complicated or impossible
Solution Approach 1:
The patent creates a copy of the transmitted signal and routes it to the receiver subsystem. This copied signal serves as a controlled spillover signal that eliminates the need to calculate complex interference patterns, as the copy exactly reproduces the transmitted signal characteristics without requiring spatial optimization
Solution Approach 2:
The patent introduces an intermediary signal path that routes a portion of the transmitted signal directly to the receiver subsystem. This intermediary approach bypasses the need for direct spatial optimization between transmitter and receiver, as the signal is deliberately coupled through a controlled path rather than relying on natural spillover
2Volume of moving object
If antennas are closely spaced to allow miniaturization, then the device size is reduced, but the spillover signal power increases making it more problematic
Solution Approach 1:
The patent converts the harmful spillover signal into a beneficial controlled signal by routing a copy of the transmitted signal to the receiver. This controlled spillover signal is used to improve correlation and enable effective spillover cancellation, transforming the harmful leakage into a useful component for signal processing
3Reliability
If the spillover signal power is kept above a certain threshold for effective cancellation, then the spillover cancellation circuit functions correctly, but it requires complex subsystem placement calculations that become impossible in MIMO systems
Solution Approach 1:
The patent creates a precise copy of the transmitted signal that is routed to the receiver subsystem. This copied signal guarantees sufficient power level for effective spillover cancellation without requiring complex spatial optimization, as the copy inherently matches the transmitted signal characteristics regardless of antenna placement
Data Source
AI summary
The present disclosure relates to a method for cancelling spillover in a MIMO radar system. The method comprises (i) transmitting and receiving a signal in a transmit-receive pair, the received signal including a spillover signal; (ii) routing a part of the transmitted signal of the transmit-receive pair to the received signal to increase the power level of the spillover signal; and (iii) cancelling the spillover signal and the part of the transmitted signal by a spillover cancellation subsystem associated with the transmit-receive pair. Because the part of the transmitted signal corresponds to the spillover signal, both of these signals may be added together to result in a combined signal having a high enough power level to improve the functioning of the spillover cancellation subsystem.