Radar Interference Suppression via Phase Compensation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing electronic scanning radar apparatuses face challenges in accurately detecting the direction of target objects due to interference components from opposing vehicles, particularly when using FM-CW radar, as interference waves can cause aliasing and phase deviations, leading to inaccurate phase information and reduced direction detection accuracy.
Innovation Solution
The radar apparatus employs interference suppression circuitry to derive momentary frequency values from short data segments, processes these values to detect the interference source direction, and applies phase compensation to shift interference components to a predetermined phase relationship, allowing for effective interference removal without determining the actual direction of arrival, thus simplifying processing and avoiding aliasing issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional interference suppression methods are used, then interference components can be reduced, but direction detection accuracy deteriorates due to aliasing and phase deviations
Solution Approach 1:
The patent applies preliminary action by performing phase compensation on channel signals before direction detection. The phase compensation amount is calculated based on the assumed direction of interference (0° direction) and applied in advance to eliminate phase deviations caused by switching delays. This preliminary phase adjustment ensures that interference components from any direction will appear with consistent phase relationships, enabling accurate suppression without affecting target direction detection accuracy.
2Object-affected harmful factors
If high-performance processors are used to perform complex calculations for interference suppression, then interference removal effectiveness is improved, but device complexity and cost increase
Solution Approach 1:
The patent applies parameter changes by transforming the interference suppression problem from a complex calculation problem to a simple parameter application problem. Instead of requiring high-performance processors to perform complex adaptive filtering or beamforming calculations, the invention changes the approach to using predetermined phase compensation amounts based on switching delay characteristics. This transforms the solution into a series of simple phase rotation operations that can be implemented with standard processors, significantly reducing computational complexity while maintaining effective interference suppression.
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
This approach enables accurate suppression of interference components, improving direction detection accuracy and reducing the complexity and cost of the radar system by eliminating the need for high-performance processors and complex calculations, while maintaining effective interference removal regardless of the interference source's direction.
Implementation Method 1
a signal mixer for mixing received signals of a plurality of channels respectively corresponding to the antenna elements with the transmission signal, to derive respective beat signals of the channels
Implementation Method 2
Each of the beat signals is periodically sampled by an A/D converter to be converted to corresponding channel data
Data Source
AI summary
In a FM-CW or CW radar apparatus, when interference components are contained in channel signals obtained as beat signals from array antenna elements of respective channels, and the interference components result from directly receiving transmitted CW radar waves from an external source, phase shifting is applied to each of the channel signals to shift respective phases of the interference components of the respective channels to a condition corresponding to reception of interference waves from a predetermined direction. The interference components are then eliminated, and reverse phase shifting is applied to restore remaining components of the channel signals to their original phase condition.