Prepared by:
This presentation is the property of its rightful owner.
Sponsored Links
1 / 16

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


  • 92 Views
  • Uploaded on
  • Presentation posted in: General

Prepared by: Jeremy Hubbard Dept. of Electrical and Computer Engineering Utah State University E: [email protected]; F: (435)797-3054 (ECE Dept.). ECE5320 Mechatronics Assignment#01: Literature Survey on Sensors and Actuators Topic: Global Positioning System. 3/7/2008.

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.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


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: [email protected];

F: (435)797-3054 (ECE Dept.)

ECE5320 MechatronicsAssignment#01: Literature Survey on Sensors and Actuators Topic: Global Positioning System

3/7/2008


Outline

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


Reference list

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/


To explore further survival pointers of web references etc

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


Major applications

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...


Basic working principle illustrated

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


Basic working principle

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


A typical sample configuration

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


A typical sample configuration1

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.


Major specifications

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


Major specifications cont

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


Limitations

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


Gps accuracy

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


How to choose

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.


How to choose cont

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


Where to buy

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


  • Login