Barometric altimeter for indoor use

摘要

There is provided a barometric altimeter to detect a floor number at the current position in especially a high-rise building, and to calculate a height or a floor number more precisely. To this end, a barometric altimeter (100) stores, at a barometric pressure/height conversion coefficient storage unit (2), a plurality of barometric pressure/height conversion coefficients that is calculated beforehand based on temperature of air indoors in accordance with a month and a date, and an arithmetic expression, for which the plurality of barometric pressure/height conversion coefficients are used. For the actual operation, while a reference barometric pressure measurement/storage unit (1) measures and stores a barometric pressure at a position as reference barometric pressure, a current barometric pressure measurement unit (3) measures the barometric pressure at the position to be measured. Then a height calculation unit (5) calculates the height through predetermined calculation using the result of processing at these blocks.

主权项

1. A barometric altimeter, comprising:
a pressure sensor; a reference barometric pressure measurement storage unit configured to store a respective barometric pressure measurement, by the pressure sensor, at a respective height, as a reference barometric pressure; a barometric pressure/height conversion coefficient storage unit configured to store:
a plurality of barometric pressure/height conversion coefficients to convert respective barometric pressure measurements, by the pressure sensor, to corresponding respective heights, andan arithmetic expression using one of the plurality of barometric pressure/height conversion coefficients as appropriate,wherein each of the plurality of barometric pressure/height conversion coefficients are calculated beforehand based on a respective temperature of air, indoors, in accordance with a particular respective date in a particular respective month so that the plurality of barometric pressure/height conversion coefficients correspond to a plurality of months and dates; and a height calculation unit configured to receive a desired height-measurement month and date information as an input, and to calculate a corresponding height or a corresponding variation in height at a respective indoor measurement position on a basis of the reference barometric pressure and the arithmetic expression using a respective barometric pressure/height conversion coefficient corresponding to the inputted height-measurement month and date information, and on a basis of a barometric pressure measurement by the pressure sensor at the respective indoor measurement position.