By Clement A. Ogaja
Utilized GPS for Engineers and venture Managers introduces civil engineers in particular those who find themselves now not already approved surveyors to the basic ideas of worldwide positioning know-how (GPS). This publication covers GPS fundamentals, together with positioning and measuring ideas, options to enhance accuracy, and an research of inexpensive as opposed to high-precision platforms. next chapters clarify the issues for choosing and imposing a GPS process after which show particular purposes of GPS in various engineering events, together with tracking the health and wellbeing of constructions, robotics and desktop keep an eye on, maritime operations, fabric monitoring in huge development websites, website keep watch over and layout, and tracking geohazards. This publication can be worthwhile for all civil engineers drawn to profiting from using GPS applied sciences.
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Additional resources for Applied GPS for Engineers and Project Managers
The orbit and clock products are offered by some organizations such as NASA’s Jet Propulsion Laboratory and the International GNSS Service (IGS). ” Relative Positioning In the relative positioning method, also commonly referred to as dijgerential GPS (DGPS) positioning, two GPS receivers are used to observe the same satellites 49 SO APPLIED GPS FOR ENGINEERS AND PROJECT MANAGERS simultaneously. One receiver, designated as the “base,” is set up at a reference station the coordinates of which are known.
In addition, the antenna phase center models for various antennas can be obtained from the National Geodetic Survey (NGS). These models can subsequently be applied to mitigate the effect of antenna phase variations. It is, however, recommended that for high-precision applications (discussed in detail in Chapter 5),care be taken not to mix antenna types or to swap antennas between sites and receivers during data collection. 45 APPLIED GPS FOR ENGINEERS AND PROJECT MANAGERS 46 Receiver Noise The magnitude of the receiver noise is dependent on parameters such as the signal-to-noise ratio and tracking bandwidth.
The true error at the rover will differ from that at the base but, since the satellites are at a relatively long distance compared to the base-rover distance, the C - 0 corrections are generally valid. The longer the base-rover separation distance (the “baseline”),the lower the accuracy of the corrections and thus the precision of the rover position. Errors at the base, such as multipath, will have a direct influence on the quality of the DGPS correction and thus on the rover position. IMPROVING ACCURACY 53 Satellite 2 Satellite 1 Satellite 3 pseudo-range corrections Base I Reference Rover Figure 3-2.
Applied GPS for Engineers and Project Managers by Clement A. Ogaja