Radar Signal Processing Using Dynamic Window Functions
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Solution Overview
Problem
Frequency modulated continuous radar systems face challenges in reliably detecting objects and determining their parameters, especially when the received transmit signal is weak, leading to unreliable detection due to the weakening of detection information.
Innovation Solution
The method involves using different window functions for processing radar detection information based on an evaluation criterion, such as signal strength, to enhance the detection of weak signals and mitigate interference effects, allowing for multiple frequency analyses to provide multiple pieces of target information with varying windowing, including the use of non-rectangular window functions like the Hann or Blackman window.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a window function is applied to reduce interfering effects, then leakage effects are reduced, but detection reliability of weak signals deteriorates
Solution Approach 1:
The patent applies different window functions dynamically based on signal strength. For strong signals, conventional window functions (Hann, Blackman) are used to reduce leakage. For weak signals, the rectangular window function is used to minimize signal weakening and maintain detection reliability. This dynamic adaptation resolves the contradiction by selecting the appropriate window function based on real-time signal conditions.
Solution Approach 2:
The patent changes the window function parameter based on signal strength evaluation. By evaluating the signal strength and selecting different window functions accordingly, the system optimizes the balance between reducing leakage effects and maintaining detection reliability for weak signals.
2Reliability
If multiple window functions are used for different signal strengths, then detection reliability is improved, but processing complexity increases
Solution Approach 1:
The patent segments the signal processing into different paths based on signal strength. Strong signals are processed with conventional window functions, while weak signals are processed with the rectangular window function. This segmentation allows the system to maintain high detection reliability without applying complex processing to all signals uniformly.
Solution Approach 2:
The system performs self-evaluation of signal strength and automatically selects the appropriate window function without external intervention. This self-service mechanism simplifies the overall system architecture by integrating the selection logic within the existing signal processing pipeline.
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 improves the reliability of detecting objects and determining their parameters by reducing signal weakening and mitigating interference, enabling the detection of weak objects while maintaining the quality of target information through the selection of appropriate window functions based on signal strength.
Implementation Method 1
electromagnetic signals emitted by the radar system, reflected on the object and received by the radar system
Implementation Method 2
determine not only the distance of a detected object but also the relative velocity with the aid of the Doppler frequency
Implementation Method 3
transmit signal reflected on the object
Data Source
AI summary
A method for providing at least one piece of target information relating to at least one object detected by a radar system of a vehicle, the following steps being carried out: providing a piece of detection information of the radar system; and carrying out a processing of the detection information, at least one windowing and at least one frequency analysis of the detection information being carried out for the purpose of providing therefrom the at least one piece of target information, the at least one piece of target information being provided with the aid of different window functions of the windowing, depending on an evaluation criterion, the evaluation criterion being specific to a signal strength of the target information.