Ground-Penetrating Radar Continuous Sampling Digitizer
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Solution Overview
Problem
Current ground-penetrating radar systems face long acquisition times and jitter errors due to the need for randomized sampling, which increases the complexity and cost of high-resolution digitization, especially in ultra-wide band applications like mine detection.
Innovation Solution
A system using a lower-resolution, moderately-fast digitizer with averaging and equivalent-time interleaving, combined with continuous sampling and best-fit algorithms to enhance resolution and sample rate, allowing for reduced pulse counts and eliminating the need for dedicated timing circuitry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If equivalent time sampling is used to capture the received signal with high resolution, then measurement precision is improved, but loss of time increases due to long acquisition times
Solution Approach 1:
The system performs continuous sampling of the reflected wave at a fixed sample rate, eliminating the need to wait for complete pulses between samples. This continuous action allows the digitizer to capture multiple samples per pulse, significantly reducing acquisition time while maintaining high measurement precision through accumulated data from multiple pulses.
2Adaptability or versatility
If transmitted pulses are randomized in time to avoid detection or interference, then adaptability is improved, but measurement precision deteriorates due to jitter in the ET sampling process
Solution Approach 1:
The system uses a timing recovery mechanism that continuously monitors the received signal and adjusts the sampling clock phase to synchronize with the randomized pulse arrivals. This feedback loop eliminates jitter by dynamically adapting the sampling timing to match the actual pulse positions, maintaining measurement precision even when pulses are randomized for security or interference avoidance.
3Measurement precision
If a high-resolution, high sample rate RT digitizer is used to implement a full RT system, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The system uses a lower-resolution, moderate sample rate digitizer that performs continuous sampling at a fixed rate, taking more samples than strictly necessary per pulse. By accumulating and averaging multiple samples, the system achieves high measurement precision without requiring an expensive high-speed digitizer, thus reducing device complexity and cost.
4Measurement precision
If multiple samples are taken at each delay setting to allow for averaging, then measurement precision is improved, but loss of time increases due to the number of pulses required
Solution Approach 1:
The system continuously samples the reflected wave without waiting for complete pulse cycles, accumulating samples across multiple pulses in real-time. This continuous accumulation allows noise reduction through averaging while minimizing acquisition time, as the system does not need to complete full pulse sequences between samples.
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 significantly reduces capture time, avoids jitter errors, and enables high-resolution signal analysis at a lower cost than full real-time systems, while effectively distinguishing coherent signals and reducing noise.
Implementation Method 1
a transmitting antenna directs an impulse toward the ground. A receiving antenna then receives a direct wave from the transmitting antenna, followed by a reflected wave from the ground
Implementation Method 2
A receiving antenna then receives a direct wave from the transmitting antenna, followed by a reflected wave from the ground
Data Source
AI summary
A ground-penetrating RADAR-based system can include a transmitter configured to transmit multiple RADAR impulses and a receiver configured to receive a signal comprising return waves generated responsive to the transmitted RADAR impulses. The signal can include a direct wave portion and a reflected wave portion. The system can also include a processing unit configured to analyze the return waves by determining the direct wave portion, fitting the direct wave portion to determine parametric information corresponding to the return waves, determining the reflected wave portion, determining characteristics of the reflected wave portion based on the parametric information, and comparing the determined characteristics against known characteristics.


