Terrain aided navigation based on computer vision
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This paper proposes a scheme of terrain aided navigation based on the principle of computer vision. Being different from the conventional terrain matching technique, the scheme uses CCD camera rather than barometer and radio altimeter as the sensing element. Terrain elevation information within an area rather than along the course of the vehicle's flight is drawn from CCD images according to the principle of computer vision. Shorter flight time is needed to gather sufficient information for successful terrain matching, hence, the scheme provides estimation and compensation for errors of the inertial navigation system more rapidly.Keywords:
Barometer
The core component of barometer is the pressure sensor, which plays a very important role in monitoring pressure, controlling pressure changes and measuring other physical quantities.Barometer obtains the air pressure data through changes of air pressure at different heights.According to the meteorological regulations, the weight of air column effecting each unit of area is called air pressure.Digital barometer is widely applied to mining enterprises, electronic products and outdoor operation, and after a long period of development, it is becoming increasingly accurate with more diversified functions, and is gradually developing towards being intelligent and multi-functional.This paper introduces the digital barometer based on single-chip control in details, analyzes the overall structure of barometer and introduces the way to realize both software and hardware of barometer as well as adjust and simulate the digital barometer system to guarantee the reliability and stability of the digital barometer system's functions. Measured VoltageVoltage
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Pressure measurement
Micro computer
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Abstract The following notes deal with the use of the ordinary Aneroid barometer for picking up topography for map purposes, and have been written in the hope that further helpful criticism will be forthcoming from readers to assist in future investigations.
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Professor Hansteen first shews, that the remarkable difference of 1·62 French lines, by which the barometer reduced to the level of the sea, is higher at Paris than at Christiania, cannot be ascribed solely to the effect of the difference of gravity of the mercury in the barometer at the two places. The author then gives an empirical formula to represent the mean height of the barometer in any latitude which he compares with observations.
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M. De Luc, F. R. S. in a large and valuable Treatise upon the Barometer and Thermometer, lately published at Geneva, the result of many years labour and study, has given a rule for the measurement of heights by the barometer, deduced from his experiments, and far more accurate than any published before; since it appears that he could determine heights by it generally to 10 or 15 feet, and that the error seldom, if ever, amounted to double that quantity.
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Thermometer
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"Account of a cheap and easily-constructed barometer for measuring altitudes." The Philosophical Magazine, 4(21), pp. 234–235
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Abstract A newly developed commercial hand-held digital aneroid barometer has been extensively tested to ascertain its performance characteristics. The atmospheric pressures measured with the tested barometer have a resolution of ±0.03mb. The barometer exhibits small but statistically significant time and temperature dependent pressure drifts of +3.8mb/year and +0.04mb/°C (−10°C to + 20°C), respectively. This paper describes the tests conducted with the barometer and their results. Frequent calibrations provided, this new barometer type can successfully replace older and more expensive designs of (mechanical) precision barometers in all surveying applications where precise atmospheric pressures are required.
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This book gives a comprehensive study of the barometer and its development as an instrument for measuring atmospheric pressure, but excludes the many barometers which have an interest mainly as items of furniture. Those which are popular in the sale rooms are not discussed, nor are manometers and special instruments for the measurement of very low pressures.
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The inclusion of the barometer sensor in smartphones signaled an opportunity for aiding indoor localization efforts. In this paper, we therefore investigate a possible use of the barometer sensor for detecting vertically oriented activities. We start by showing the accuracies of various commodity measurement devices and the challenges they bring forth. We then show how to use the barometer values to build a predictor that can detect floor changes and the mode (elevator, escalator, or stairs) used to change floors with nearly 100% accuracy. We validate these properties with data collected using 3 different measurement devices from 7 different buildings. Our investigation reveals that while the barometer sensor has potential, there is still a lot left to be desired.
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Stairs
Elevator
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Not. 1. That the following observations were of a portable barometer from England; which by a barometer set up here were always 6/20 of an inch lower. Not 2. That the barometer stood about 18 feet above the superficies of the sea at high water.
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Low latitude
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