TAILIEUCHUNG - Sensors and Methods for Robots 1996 Part 5

Tham khảo tài liệu 'sensors and methods for robots 1996 part 5', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Chapter 3 Active Beacons 81 Table Summary of parameters measured and performance areas evaluated. Courtesy of Byrne 1993 . Parameter measured Performance evaluated by that parameter Time-to-first-fix How quickly a receiver starts navigating. Not explicitly measured but qualitatively considered. Static position accuracy Static accuracy and insight into overall accuracy. Static navigation mode Number of satellites tracked Taking into account DOP switching gives insight into receiver antenna sensitivity. Dynamic position plots Some accuracy information is obtained by comparing different data plots taken while driving down the same section of road. Most of this analysis is qualitative though because there is no ground-truth data for comparison. Dynamic navigation mode Taking DOP switching into account gives insight into the sensitivity of the receiver antenna and the rate with which the receiver recovers from obstructions. Test hardware The GPS receivers tested use a serial interface for communicating position information. The Magnavox 6400 receiver communicates using RS-422 serial communications while the other four receivers use the RS-232 communications standard. The RS-422 and RS-232 standards for data transmission are compared in Table . For the short distances involved in transmitting GPS data from the receiver to a computer the type of serial communications is not important. In fact even though RS-232 communications are inferior in some ways to RS422 RS-232 is easier to work with because it is a more common standard especially for PC-type computers . A block diagram of the overall GPS test system is shown in Figure . Figure depicts the system used for dynamic testing where power was supplied from a 12-Volt battery. For the static testing AC power was available with an extension cord. Therefore the computer supply was connected directly to AC while the 12 Volts for the GPS receivers was generated using an AC-DC power supply for the static

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