Claims
- 1. The method of detecting roadway markers on a roadway exposed to the sky, comprising the steps of:positioning a MMW radiometric detector at a predetermined position above the roadway with the MMW radiometric detector's receiving antenna oriented at a predetermined angle to the roadway surface, said predetermined angle being 45 degrees or larger, but less than ninety degrees; moving said MMW radiometric detector along and at a constant height above said roadway to traverse any roadway markers on said roadway; and monitoring the output of the detector for a change in output.
- 2. The method as defined in claim 1, wherein said predetermined angle is 70 degrees and wherein said MMW radiometric detector comprises tuning means for restricting electromagnetic energy detected to that electromagnetic energy having a frequency of approximately 94 GHz.
Parent Case Info
This is a divisional of U.S. patent application Ser. No. 09/342,786, filed on Jun. 29, 1999 (now U.S. Pat. No. 6,157,320 issued Dec. 5, 2000), which is a continuation of U.S. patent application Ser. No. 08/864,249, filed on May 28, 1997 (now U.S. Pat. No. 6,194,486 issued Feb. 27, 2001).
US Referenced Citations (13)
Foreign Referenced Citations (3)
Number |
Date |
Country |
0135740 |
Apr 1985 |
EP |
2237862 |
May 1991 |
GB |
9621700 |
Jul 1996 |
WO |
Continuations (1)
|
Number |
Date |
Country |
Parent |
08/864249 |
May 1997 |
US |
Child |
09/342786 |
|
US |