Meteorological station with GPS receiver

(PresseBox) ( Gechingen, )
The meteorological station Suntracer KNX combines sensors for brightness, wind velocity, temperature and the precipitation detection. Until now, the all-round device for weather data collection has been equipped with a DCF77 antenna which delivered the radio clock time. In the future, the Suntracer will be offered alternatively as Suntracer KNX-GPS with integrated GPS receiver (filed as an application for a patent WO 2007/006775 A1).

The GPS receiver offers the meteorological station the geographic position (degree of longitude and degree of latitude) and the world time (UTC). In order to get the local time, the country is selected in the product file of the Suntracer KNX GPS (software ETS). Summer and winter time will than be taken into consideration automatically. Of course, the current local time can also be sent on the KNX bus.

Location and local time are necessary for the control of shading dependent on the altitude of the sun, since these allow for determining the current direction (azimuth) and height (elevation) of the sun. Thus the bus system knows the altitude of the sun and the brightness which is measured by means of a sun sensor. Special automatic functions can for instance ideally adjust the slats of blinds, close shadings only in the case of the sun shining from a special direction or track the shadow outline so that the sun only enters the room until a defined limit. The aim of adjusting the sun protection to the altitude of the sun is to allow as much daylight as possible to enter the room, but to avoid direct solar radiation which dazzles and superheats the room.

The meteorological station Suntracer KNX-GPS improves the receipt and the processing of the time signal. The signal DCF77 used until now can only be used regionally. The further away it is from the transmitting antenna in Frankfurt/Main, the more difficult and the more seldom the date and the time can be received. Shielding obstacles like for instance big buildings in the environment can also influence the DCF77 receipt within Germany. Furthermore the coordinates of the location had to be entered manually. The receipt of the GPS data will allow for worldwide and exact data in the future.
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