Radar Echo Summing Control for Weak Target Signal Extraction
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Solution Overview
Problem
Radar devices face challenges in distinguishing target signals from clutter signals and noise, especially when the echo pulse magnitude is weak, leading to reduced signal-to-noise ratio and difficulty in extracting target information.
Innovation Solution
A radar device and method that utilize a statistical distribution of noise, employing a multi-receiving circuit AFE, sampling circuit, signal integrator, and AFE controller to perform saturation and magnitude verification operations, adjusting the number of signals summed based on verification results to enhance signal extraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the radar device receives echo pulse with weak magnitude, then the target object detection capability is reduced, but the signal-to-noise ratio deteriorates
Solution Approach 1:
The patent combines multiple amplified signals through analog summing to generate a summed signal, merging the weak target signal with multiple other signals to improve the overall signal-to-noise ratio while preserving target detection capability
Solution Approach 2:
The AFE controller performs saturation verification and magnitude verification operations, using feedback from noise statistical data analysis to dynamically adjust the number of signals being summed, thereby optimizing the signal-to-noise ratio based on actual signal conditions
2Power
If the radar device sums multiple amplified signals to improve signal magnitude, then the target signal magnitude is preserved, but the distinction between target signal, clutter signal, and noise deteriorates
Solution Approach 1:
The system uses feedback control where the AFE controller analyzes noise statistical data and performs verification operations to dynamically adjust the number of signals being summed, preventing signal distinction loss while maintaining adequate signal magnitude
Solution Approach 2:
The patent changes the parameter of signal summation count dynamically based on noise statistical analysis and verification results, adjusting this parameter to optimize both signal magnitude and signal distinction capability under different operating conditions
3Reliability
If the radar device increases the number of signals being summed, then the signal-to-noise ratio is improved, but the risk of saturation increases
Solution Approach 1:
The AFE controller performs saturation verification operations that provide feedback on the saturation status of the summed signal, using this feedback to dynamically adjust the number of signals being summed to prevent saturation while maintaining optimal signal-to-noise ratio
Solution Approach 2:
The system dynamically adjusts the number of signals being summed based on real-time verification results and noise statistical data, making the signal summation process adaptive rather than fixed, allowing optimization of signal-to-noise ratio while avoiding saturation under varying conditions
Data Source
AI summary
A radar device is disclosed. The radar device includes a transmitting unit that radiates a transmission pulse, and a receiving unit that receives an echo pulse reflected from a target object. The receiving unit includes a multi-receiving circuit AFE including a plurality of receiving circuits that amplifies an echo pulse to output an amplified signal and an analog signal summing circuit that generates a summed signal, a sampling circuit that repeatedly performs a sampling operation on the summed signal to generate a plurality of sampling data, a signal integrator that generates integrated data for each of range cells, a statistical signal converter that acquires noise statistical data and generates an extracted signal, and an AFE controller that performs a characteristic verification operation for the noise statistical data and adjusts the summed signal.