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Design of high-frequency pulse subsurface penetrating radar for pavement assessment.

机译：用于路面评估的高频脉冲地下穿透雷达的设计。

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摘要

High-frequency subsurface penetrating pulse radar (SPR) has been developed for pavement assessment applications, such as measuring the thickness and dielectric constant of a layer. SPR transmits a monocycle pulse having 333-ps width and receives a signal reflected from the pavement through wide-band antennas. The developed SPR is composed of a receiver, transmitter, antennas, and data acquisition device. Each subsystem has been designed and fabricated using microwave integrated circuit (MIC) technology.; The integrated sampling receiver has its own pulse generator, local oscillator (LO), and IF amplifier. The internal pulse generator uses a step recovery diode (SRD) together with a unique ultra-wideband hybrid junction to generate sub-nanosecond balanced pulses for gating the sampling bridge diodes. The receiver has been designed for detecting the DC to 6-GHz signal. The receiver shows a 15-dB return loss at the RF port over this RF bandwidth, a 50-dB dynamic range, and a 1-dB compression point at 5dBm input power.; The transmitter operates in the sub-nanosecond regime and employs a Schottky diode, SRD, MESFET, and simple charging and discharging circuitry. It is completely fabricated using a microstrip line. The monocycle pulse generator produces a monocycle pulse having a 333-ps pulse width and more than 2 Volts from an input square wave of 10-MHz repetition rate. The generated monocycle pulses have very symmetrical positive and negative portions and a low ringing level.; A wide-band antenna has been designed based on a cosine-tapered microstrip line and forms a quasi-horn structure. The measured results show a return loss of better than 10-dB from 0.2 to more than 20-GHz, gain from 7.5-dB at 2.6-GHz to 17.6-dB at 18-GHz. Measured transient responses of the antenna confirm its feasibility for use in ultra wide band (UWB) time-domain systems.; Finally, these SPR sub-systems are integrated in each transmit and receive microwave substrate with antennas to achieve a compact structure and seamless electrical connections.; Various samples have been tested for verifying the prototype radar performance. The received data was stored and processed by Labview® and Matlab®. The analysis results show usefulness of the prototype SPR to estimate material parameters and thickness of layers. This developed high frequency SPR prototype can be used for pavement assessment applications with low cost and higher resolution.
机译：高频地下穿透脉冲雷达（SPR）已开发用于路面评估应用，例如测量层的厚度和介电常数。 SPR发送宽度为333 ps的单周期脉冲，并通过宽带天线接收从人行道反射的信号。开发的SPR由接收器，发射器，天线和数据采集设备组成。每个子系统都是使用微波集成电路（MIC）技术设计和制造的。集成采样接收器具有自己的脉冲发生器，本地振荡器（LO）和IF放大器。内部脉冲发生器使用阶跃恢复二极管（SRD）和独特的超宽带混合结来生成亚纳秒平衡脉冲，以对采样桥二极管进行选通。接收器设计用于检测DC至6 GHz信号。接收机显示在此RF带宽上，RF端口的回波损耗为15dB，动态范围为50dB，在5dBm输入功率下的压缩点为1dB。该发射器工作在亚纳秒级，并采用了肖特基二极管，SRD，MESFET和简单的充电和放电电路。它是使用微带线完全制成的。单周期脉冲发生器从10 MHz重复频率的输入方波中产生一个脉冲宽度为333 ps，大于2伏的单周期脉冲。产生的单周期脉冲具有非常对称的正负部分和低振铃水平。已经基于余弦锥形微带线设计了宽带天线，并形成了准角结构。测量结果表明，从0.2到20 GHz以上，回波损耗优于10 dB，从2.6 GHz的7.5 dB增益提高到18 GHz的17.6 dB。天线测得的瞬态响应证实了其在超宽带（UWB）时域系统中使用的可行性。最后，这些SPR子系统集成在每个带有天线的发射和接收微波基板中，以实现紧凑的结构和无缝的电连接。已经测试了各种样品，以验证原型雷达的性能。接收的数据由Labview ®和Matlab ®存储和处理。分析结果表明，原型SPR可以用于估算材料参数和层厚度。这种开发的高频SPR原型可用于低成本和高分辨率的路面评估应用。

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  • 作者

    Lee, Jeong Soo.;

  • 作者单位

    Texas A&M University.;

  • 授予单位 Texas A&M University.;
  • 学科 Engineering Electronics and Electrical.; Engineering Civil.
  • 学位 Ph.D.
  • 年度 2000
  • 页码 118 p.
  • 总页数 118
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 无线电电子学、电信技术;建筑科学;
  • 关键词

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