Radar Leakage Suppression with Datum Difference Signal Subtraction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
FMCW radar systems suffer from signal leakage between transmitting and receiving antennas, which degrades measurement accuracy due to strong leakage signals, and traditional methods to mitigate this issue, such as increasing antenna separation and using isolation plates, incur hardware and operational costs.
Innovation Solution
A radar signal processing method that involves mixing echo signals with a local oscillator signal, performing digital signal processing, and subtracting a datum differential frequency signal to obtain a target signal, effectively reducing the impact of leakage signals without altering antenna separation or adding isolation plates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the distance between transmitting antenna and receiving antenna is widened, then the isolation between antennas is improved and leakage signal energy is reduced, but the size of the radar increases
Solution Approach 1:
The patent extracts the leakage signal component from the received signal by using a reference signal that contains only leakage information. Through subtraction processing, the harmful leakage signal is separated and removed from the composite signal, leaving only the target echo signal for accurate measurement.
Solution Approach 2:
The patent introduces a reference signal as an intermediary element that carries leakage signal information. This reference signal acts as a mediator to enable the separation and elimination of leakage signals from the received signal through correlation processing and subtraction.
2Object-affected harmful factors
If isolation plates are added between transmitting and receiving antennas, then the isolation between antennas is improved and leakage signal energy is reduced, but the hardware cost and operation and maintenance cost increase
Solution Approach 1:
The patent replaces the mechanical/physical isolation approach (isolation plates) with a signal processing approach. Instead of using physical barriers to block leakage signals, the system uses digital signal processing techniques including correlation, subtraction, and filtering to eliminate leakage interference.
3Object-affected harmful factors
If the distance between transmitting antenna and receiving antenna is widened, then the isolation between antennas is improved and leakage signal energy is reduced, but the operation and maintenance cost increases
Solution Approach 1:
The patent replaces the mechanical/physical isolation approach (isolation plates) with a signal processing approach. Instead of using physical barriers to block leakage signals, the system uses digital signal processing techniques including correlation, subtraction, and filtering to eliminate leakage interference.
4Device complexity
If traditional signal processing methods are used without leakage compensation, then the device complexity is low, but the measurement precision deteriorates due to strong leakage signals
Solution Approach 1:
The patent uses feedback by continuously monitoring the reference signal and using it to dynamically compensate for leakage signals in the received signal. The reference signal provides feedback information about leakage characteristics that is used to adjust and improve the accuracy of leakage cancellation.
Solution Approach 2:
The patent introduces a reference signal as an intermediary element that carries leakage signal information. This reference signal acts as a mediator to enable the separation and elimination of leakage signals from the received signal through correlation processing and subtraction.
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 method enhances measurement accuracy by reducing the proportion of leakage signals in the target signal, thereby improving the precision of distance and speed measurements while maintaining a compact radar design and minimizing costs.
Implementation Method 1
mixing an echo signal based on a local oscillator signal
Data Source
AI summary
The radar signal processing method includes: after an echo signal is mixed based on a local oscillator signal, and digital signal processing is performed to obtain a signal to be processed, the signal to be processed is subtracted based on a datum difference frequency signal to obtain a target signal, and a travelling speed of a target relative to a radar and/or a distance of the target relative to the radar is determined according to the target signal. Since the datum differential frequency signal is a signal obtained by mixing a leakage signal based on the local oscillator signal and performing the digital signal processing in a target free environment. Therefore, subtracting the signal to be processed based on the datum differential frequency signal can effectively reduce the content of the leakage signal in the signal to be processed, thereby improving the accuracy of the measurement results.