Receiver Diversity Signal Processing for Radar Angle Estimation
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Solution Overview
Problem
Existing wideband radar and communications receivers face challenges in signal fading and angle of arrival estimation, particularly in non-cooperative scenarios and single-antenna receptions, where standard MIMO techniques are less effective, and SIMO methods often lose angle information.
Innovation Solution
The proposed solution involves signal processing techniques using receiver diversity with optimization methods, specifically selection combining and signal equalization algorithms, to improve signal-to-noise ratio (SNR) and estimate angle of arrival, while mitigating fading and filtering differences across multiple receivers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If standard MIMO techniques are used in non-cooperative receivers, then signal reception can be improved, but angle of arrival information is lost or becomes unavailable
Solution Approach 1:
The patent segments the signal processing into two distinct stages: first applying selection combining to select the best signal copy while preserving its angle information, then separately estimating angle of arrival from the selected signal. This segmentation allows both signal reliability and angle information to be maintained without interference.
2Loss of information
If selection combining is used in SIMO systems, then angle of arrival information is preserved, but signal fading mitigation is insufficient compared to other combining methods
Solution Approach 1:
The patent applies preliminary signal equalization before selection combining to pre-compensate for channel effects. By equalizing the signal copies in advance, the system enhances the effectiveness of subsequent selection combining, allowing better fading mitigation while still preserving angle information from the selected signal.
3Reliability
If multiple antennas are added to improve signal reception, then fading mitigation improves, but system complexity increases
Solution Approach 1:
The patent extracts and processes each signal copy independently through equalization before selection combining. This extraction approach allows the system to handle multiple antenna inputs through simple, modular processing steps rather than complex joint processing, reducing overall system complexity while maintaining effective fading mitigation.
Data Source
AI summary
Methods for improving multiple signal reception using receiver diversity in the context of a wideband radar and communications receiver. The method allows for improved signal reception as well as improved angle of arrival estimation. A first approach uses a method that improves angle of arrival estimation while using the standard diversity technique of selection combining. A second approach uses a method of equalization of the signal rather than equalization of the channel to both improve the signal SNR over standard selection combining and further improve the angle of arrival estimate over the first approach.