Doppler Ratio Value for False Target Removal in Pulse Doppler Radar
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Solution Overview
Problem
Pulse Doppler radar systems face challenges in accurately classifying true targets due to false detections caused by interference signals and sidelobes, especially when dealing with complex and diverse target situations, leading to inefficient removal of false targets.
Innovation Solution
An apparatus and method that utilize a Doppler ratio value calculated from the total energy of signals in the range-Doppler domain to differentiate between true and false targets by comparing the ratio value with a user-prescribed threshold, effectively removing false targets with a Doppler ratio value less than the threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If complex methods such as two-dimensional detector or signal magnitude shape consideration are used to remove false targets, then false target removal performance improves, but computation complexity increases
Solution Approach 1:
The patent introduces a Doppler ratio value parameter that quantifies the concentration of signal energy in the Doppler domain. By calculating this parameter and comparing it against a threshold, the system achieves effective false target removal through a simple parameter-based criterion rather than complex signal processing methods.
Solution Approach 2:
The patent replaces complex mechanical/computational signal processing methods (two-dimensional detection, gradient analysis) with a mathematical parameter calculation approach. The Doppler ratio value is computed using energy summation formulas, substituting iterative complex algorithms with direct mathematical computation.
2Device complexity
If simple detection methods are used, then computation complexity decreases, but false target removal performance deteriorates
Solution Approach 1:
The patent introduces a Doppler ratio value parameter that quantifies the concentration of signal energy in the Doppler domain. By calculating this parameter and comparing it against a threshold, the system achieves effective false target removal through a simple parameter-based criterion rather than complex signal processing methods.
3Measurement precision
If Doppler processing is performed to extract target velocity, then velocity component accuracy improves, but false target detection increases
Solution Approach 1:
The patent segments the detection process into two independent stages: velocity extraction through Doppler processing, and false target identification through Doppler ratio value calculation. This segmentation allows each stage to perform its function optimally without interfering with the other, resolving the contradiction between velocity accuracy and false target suppression.
Solution Approach 2:
The Doppler ratio value acts as an intermediary parameter that bridges velocity measurement and false target detection. It is calculated from the same Doppler domain data used for velocity extraction but provides independent information about signal authenticity, enabling both functions to coexist without contradiction.
Data Source
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AI summary
An apparatus for classifying a true target includes a signal processor configured to perform range processing on an input signal in a fast time direction and Doppler processing on the input signal in a slow time direction to output an output signal in a range-Doppler domain, a detector configured to output a hit by detecting a target signal within an output signal on which the range processing and the Doppler processing have been performed in the signal processor, a total energy calculator configured to calculate a total energy value of the input signal of the signal processor in the slow time direction or a total energy value which is a sum of power spectra of the output signal of the signal processor in the Doppler direction, a Doppler ratio value calculator configured to calculate a Doppler ratio value of the hit detected in the range-Doppler domain using the total energy value, and a false target remover configured to compare the Doppler ratio value with a threshold value and determine a hit having the Doppler ratio value smaller than the threshold value as a false target.