Title:
【発明の名称】相対視程決定方法およびその装置
Document Type and Number:
Japanese Patent JP3287570
Kind Code:
B2
Abstract:
PCT No. PCT/EP93/02689 Sec. 371 Date Apr. 5, 1995 Sec. 102(e) Date Apr. 5, 1995 PCT Filed Oct. 1, 1993 PCT Pub. No. WO94/08254 PCT Pub. Date Apr. 14, 1994A relative visibility measuring process measures and stores a reference propagation time of a measurement pulse over a reference distance between a pulse propagation time rangefinder and a reflector under ideal conditions. A reference amplitude of a measurement pulse, which is reflected by the reflector under ideal conditions, is measured and stored. An actual signal which is equal to the time response of the received signals of the rangefinder under actual conditions, is measured and stored. A determination is made of an actual amplitude which is equal to the amplitude of a time element of the actual signal having a propagation time equal to the reference propagation time. A determination is made of the ratio of the actual amplitude to the reference amplitude and comparison of the ratio with a threshold value which is dependent on the visibility to be determined. A comparison is made between the signal waveform of the actual signal with standard waveforms for various visibility states of the measurement path. The comparison results are logically linked in order to produce a switching and/or warning signal to indicate a visibility undershoot or a measurement disturbance.
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Inventors:
Mets Jurgen
Tideke Joachim
Tideke Joachim
Application Number:
JP50871794A
Publication Date:
June 04, 2002
Filing Date:
October 01, 1993
Export Citation:
Assignee:
Leica Geometries Actien Gezel Shaft
International Classes:
G01S7/497; G01S17/88; G01S17/10; G01S17/95; (IPC1-7): G01S17/10; G01S17/88
Domestic Patent References:
| JP420892A | ||||
| JP60201276A | ||||
| JP1134232A | ||||
| JP5119153A | ||||
| JP5205191A | ||||
| JP50137587A |
Other References:
【文献】米国特許3694936(US,A)
Attorney, Agent or Firm:
Takehisa Ito (1 outside)
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