By Dan Doberstein
Fundamentals of GPS receivers covers GPS receivers' concept and perform. The e-book starts off with the fundamentals of GPS receivers and strikes onward to extra complicated fabric. The e-book examines 3 sorts of GPS receiver implementations: first is the customized layout by means of the writer; moment is an usual layout, now a part of the open resource community; the 3rd pertains to the receiver designed by way of JPL /NASA. each one receiver is exclusive permitting the reader to determine how each one layout solves an identical difficulties. Chapters talk about provider section measurements and GPS time and frequency measurements. the final textual content is size orientated instead of processing the measurements. With a spotlight at the basics of measurements the reader may be development their instinct for the actual phenomenon at work.
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Extra resources for Fundamentals of GPS Receivers: A Hardware Approach
If we were to look at a 1 pps signal generated from the receiver’s reference clock it “track” the GPS master clock with greater precision. This example also illustrates that by refining the path delay estimate we can achieve greater accuracy in the computed value of Tbias. This will also be true for computed user position. It is hoped the reader sees the pattern emerging of successive refinements to the path delay, which results in greater accuracy for both position and time measurements. 6 Solving For User Position Using Four Satellites With the previous examples and models we have laid the groundwork for the task of determining user position, Xu, Yu, Zu in ECEF coordinates and the user clock error, Tbias.
The Tsent and Trec information are obtained as before by just taking a “snap shot” of the receiver reference clock and the receiver’s replica of the SV clock. If we record the SV position at the same instant that we record Trec and Tsent, we will have all the information needed to solve for Tbias. It is important to realize that due to SV motion we must “capture” the SV position data at the same moment we capture the state of the receiver’s clocks. If we do not properly capture SV position, Tsent, and Trec, then the computed distance, R, would be incorrect for the measured path delay.
A final note on the master clock. As shown in Fig. 977 ms dial. In the GPS master clock this resolution is much higher. For all practical purposes this dial becomes an analog dial (infinite number of tics) and its precision is so high. 13 A “Second” Counting Dial for the Clock (Modified TOW) The basic time unit of GPS is the second. Our clock model to date could measure up to 1 s of time with great accuracy. As we have said this is more than adequate for many receiver functions. But there are operations we will need to do later that need to know how many seconds have elapsed.