所属领域：
先导专项—精密测量领域监测服务
资源类型：
时频前沿探索
/ 远距离时频传递
文献作者：
Deng, RL; Liu, C
文献发表年份：
1999
文献期刊：
JOURNAL OF APPLIED GEOPHYSICS
文献摘要：FM-CW radar is capable of detecting subsurface anomalies by using linear sweep frequency transmission of a periodically repetitive continuous FM signal. Due to the continuous-wave nature, the peak power of the FM-CW radar is usually in the range of hundreds of milliwatts. In cases where high resolution is necessary, the FM-CW radar is preferred because of the simple hardware structure and the availability of low-power components. The distance from the antenna to an anomaly can be determined by FM-CW radar in lossless media. In this paper, we present both analytical and numerical methods for modelling FM-CW radar performance in lossless and lossy layered formations for 1D and 2D cases. The FM-CW operating frequency is set in the range of 1-2 GHz, and the sweep periods are 10 ms and 2 ms, respectively. An inversion formulation is discussed to invert the distance and dielectric constant simultaneously from the spectrum of the received signal by using FFT and the 'range equation'. The spatial resolution is about one-third of the center wavelength and the depth of penetration is about 4 m in a medium having a conductivity less than 1 mS/m. The FM-CW radar technique cannot be used in a lossy medium having conductivity more than 30 mS/m. The spectrum and images of multilayer formations is also studied. (C) 1999 Elsevier Science B.V. All rights reserved.
文献类型： Article
文献语种： English
文献作者地址： Univ Houston, Dept Elect & Comp Engn, Houston, TX 77204 USA
