Realization of Time-Domain Ultra Wideband Ground-Penetrating Radar Using High Speed Accumulation and Interpolated Sampling
First Claim
1. A ground-penetrating radar transmitter and receiver, configured to:
- construct a measurement waveform comprised of a plurality of interdigitated linearly sampled sequences;
offsetting each said sequence of said plurality of sequences by a time frame whose modulus is smaller than the sampling period of a single sampled sequence of said plurality of sampled sequences.
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Accused Products
Abstract
Embodiments of the disclosed technology use high-speed interpolated (interdigitated) sampling for the specific purpose of GPR (Ground-Penetrating RADAR). This technology solves several issues associated with high-speed sampling in GPR which included 1) dynamic range limitations, 2) regulatory compliance issues, 3) sampler core offset error, and 4) timing errors. High-speed interpolated sampling GPR is implemented using a high-speed ADC in combination with trigger logic (such as an FPGA) and a programmable delay generator. The FPGA or other trigger logic generates a series of randomly dithered trigger pulses. A variable delay generator (or “Vernier”) is synchronously controlled in order to produce the fractional timing. The timing of the pulses is randomly or pseudo-randomly dithered, and the phase of the interpolation is shuffled in order to avoid producing discrete spectral lines in the radiated RADAR signal.
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Citations
22 Claims
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1. A ground-penetrating radar transmitter and receiver, configured to:
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construct a measurement waveform comprised of a plurality of interdigitated linearly sampled sequences; offsetting each said sequence of said plurality of sequences by a time frame whose modulus is smaller than the sampling period of a single sampled sequence of said plurality of sampled sequences. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method of producing a waveform using a ground-penetrating radar transmitter and receiver, comprising the following steps:
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obtaining a plurality of interdigitated linearly sampled sequences; offsetting each said sequence of said plurality of linearly sampled sequences by a time frame smaller than the sampling period of a single-sampled sequence of said plurality of sampled sequences; and constructing a measurement waveform based on said plurality of interdigitated linearly sampled sequences. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22)
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Specification