Abstract
In Chap. 4 radiolocation time-of-arrival determination was analyzed as a prime method for determining the position of a mobile device due to its high accuracy even in severe multipath conditions indoors. In this chapter an alternative approach to position determination using sensor data is analyzed.
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- 1.
See the World Wide Words web site (www.worldwidewords.org) for background on the origin of this terminology. This reference shows that dead reckoning has been in the English language since the early seventeenth century. It had much the same sense then as it does now, that of estimating the position of a vessel from its speed, direction of travel and time elapsed, making use of a log, compass and clock. Note that the term “dead reckoning” (for deduced reckoning) has been erroneously ascribed in the US as the origin of the term in the twentieth century.
- 2.
The magnetic deviation is another correction factor due to local effects such a materials such as steel in the building structure. Such affects would in general be considered as unknown random heading errors for indoor positioning.
- 3.
As mobile devices attached to the human body will be affected by the temperature of the body which is typically 10–15 °C above the ambient environmental temperature, the initial attachment of a device to a person will result in a change in temperature of the sensors over a period of several minutes. However, after an initial period, the body temperature ensures the sensors operate at a stable temperature.
- 4.
For example, in determining a position with redundant range or time-of-arrival data, an estimate of the position error can be made. When this error estimate is small, the sensor calibration process can be initiated.
- 5.
See Sect. 7.7 for details of this function.
- 6.
As the transient errors can occur suddenly as a function of position, these errors also occur suddenly as a function of time for a moving device. Sudden changes in the time domain day imply the signal has a wideband spectrum when compared with those associated with the movement of a body.
- 7.
See Chap. 10 for details of the horse racing application of radiolocation technology.
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Sharp, I., Yu, K. (2019). Use of Sensors for Position Determination. In: Wireless Positioning: Principles and Practice. Navigation: Science and Technology. Springer, Singapore. https://doi.org/10.1007/978-981-10-8791-2_7
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DOI: https://doi.org/10.1007/978-981-10-8791-2_7
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