1 / 16

Prepared by: Jeremy Hubbard Dept. of Electrical and Computer Engineering Utah State University

Prepared by: Jeremy Hubbard Dept. of Electrical and Computer Engineering Utah State University E: j.l.hubbard@aggiemail.usu.edu; F: (435)797-3054 (ECE Dept.). ECE5320 Mechatronics Assignment#01: Literature Survey on Sensors and Actuators Topic: Global Positioning System. 3/7/2008.

simone
Download Presentation

Prepared by: Jeremy Hubbard Dept. of Electrical and Computer Engineering Utah State University

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Prepared by: Jeremy Hubbard Dept. of Electrical and Computer Engineering Utah State University E: j.l.hubbard@aggiemail.usu.edu; F: (435)797-3054 (ECE Dept.) ECE5320 MechatronicsAssignment#01: Literature Survey on Sensors and Actuators Topic: Global Positioning System 3/7/2008

  2. ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators Outline • Reference list • To probe further • Major applications • Basic working principle illustrated • A sample configuration • Major specifications • Limitations

  3. ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators Reference list • http://www.gps.gov/ • http://www.colorado.edu/geography/gcraft/notes/gps/gps_f.html • http://aprs.gids.nl/nmea/

  4. ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators To explore further (survival pointers of web references etc) • http://en.wikipedia.org/wiki/Global_Positioning_System

  5. ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators Major applications • Outdoor position sensing • UAV position • Car Navigation • Backwoods Navigation • Timing • Precise worldwide timing • Surveying • etc...

  6. ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators Basic working principle illustrated • Constellation of satellites constantly sends out extremely accurate time information along with orbital information. • Using triangulation based on the doppler effect the precise position of almost any place on earth can be calculated. http://en.wikipedia.org/wiki/File:ConstellationGPS.gif

  7. ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators Basic working principle • The satellites transmit data in frames and subframes for the GPS receivers to decode http://www.colorado.edu/geography/gcraft/notes/gps/gps_f.html

  8. ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators A typical sample configuration • The data is transmitted serially to a microcontroller • Microcontroller parses data to get position • http://phy5ics.com/blog/wp-content/uploads/2008/11/gps_bt_schematic_rev1.jpg

  9. ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators A typical sample configuration • Data from GPS is commonly output in NMEA format • For information on decoding NMEA sentences see: http://aprs.gids.nl/nmea/ • Typical data included in NMEA sentences includes: signal quality, satellites in view, quality of position lock, latitude and longitude, ground speed, altitude, heading, time, and much other data.

  10. ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators Major specifications • Number of Channels (12-50) • Time to fix (seconds): • Hot start: 8 • Warm start: 38 • Cold start: 42 • Output Protocol (NMEA or proprietary) • Antenna Gain • Receiver Sensitivity

  11. ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators Major Specifications (cont.) • Supply Voltage • Supply Current • Accuracy (0.001 m to 3.3+m) • Augmentations (WAAS, DGPS, EGNOS, MSAS) • Output type: • SPI • UART

  12. ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators Limitations • Accuracy is not high enough for many precision tasks • Update frequency may be to slow for many applications • Not always suitable indoors

  13. ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators GPS Accuracy • Low-cost, single-receiver SPS projects (100 meter accuracy) • Medium-cost, differential SPS code Positioning (1-10 meter accuracy) • High-cost, single-receiver PPS projects (20 meter accuracy) • High-cost, differential carrier phase surveys (1 mm to 1 cm accuracy) • Prices range from about $50 to $50000

  14. ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators How to choose • Types of modules available: • GPS module • Antenna is onboard, easiest to interface with, typically a UART on a microcontroller is suitable • OEM module • Not mounted on a PCB, most customizable, but PCB may need to be designed for RF depending on the module and antenna chosen, additional components may be required.

  15. ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators How to choose (cont.) • Update frequency • Most modules update between 1Hz and 5Hz • System power • Typical modules run on 1.8, 3.3, or 5 V • Current supply ranges from 20mA to 100mA • Required accuracy, major determination of cost • TTFF • Antenna gain high enough for the application

  16. ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators Where to Buy • www.sparkfun.com • www.digikey.com • www.mouser.com • http://www.usglobalsat.com/c-43-engine-boards-modules.aspx • Various other online retailers

More Related