Cloud altitude measuring apparatus
US4208125A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 31, 1978 |
| Grant date | Jun 17, 1980 |
| Priority date | — |
| Expiry date | May 31, 1998 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02A90/10
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Cloud altitude measurement is carried out in a step-by-step manner wherein the measuring distance is changed by a predetermined amount for each measurement step. First and second integrators respectively integrate reflected echo signals during respective first and second time intervals T.sub.1, T.sub.2 with T.sub.1 <T.sub.2. The first integrator integrates reflected light pulses and noise and the second integrator integrates noise. The difference between the integrated signal outputs from the first and second integrators is determined by a summation device and a controllable level-sensing signal evaluating device emits a signal if the aforesaid difference exceeds a predetermined value. The signal evaluating device is controlled to emit the indicating signal when a number of consecutive measurement steps have been measured. The first and second integrators can be controlled to integrate over a plurality of consecutive measurement steps before being reset to zero or alternatively, integration is performed over one or more measurement steps at a time. In the latter case, the measuring apparatus further comprises an analog/digital convertor connected to the output of the summation devi…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.