| 摘要 |
PCT No. PCT/US97/15338 Sec. 371 Date Mar. 3, 1999 Sec. 102(e) Date Mar. 3, 1999 PCT Filed Sep. 2, 1997 PCT Pub. No. WO98/10310 PCT Pub. Date Mar. 12, 1998A ground penetrating radar uses an oblique or grazing angled radiation beam to provide improved coupling of radar energy into the earth reducing forward and back scatter and eliminating the need to traverse the surface of the earth directly over the investigated volume. |
