GPS Xinwen Fu

By Dr. Xinwen Fu2 Outline  Deluo USB GPS Pro+ SiRFstarIII  Introduction to gpsd  Installation  Collect Position Data  sirfmon  Convert latitude/longitude  kismet+gpsmap

By Dr. Xinwen Fu3 Deluo USB GPS Pro+ SiRFstarIII  ReceiverUp to 20 simultaneously tracking channels. L1, MHz, C/A code  Accuracy < 2.5m (Autonomous) < 2.0m (WAAS) <0.01 m/s (speed)  AcquisitionHot Start: 1 sec. (Min.) Warm Start: 35 sec. (Average) Cold Start: 42 sec. (Average)  DynamicsAltitude: 18,000m (Max.) Velocity: 500m/sec (Max.) Acceleration: 4G (Max.)  SensitivityAcquisition: -142 dBm Tracking: -159 dBm  Navigation update rateOnce per second  ProtocolNMEA 0183 Ver.3.0  NMEA MessagesGGA, GSA, GSV, RMC, VTG  Coordinate Datum WGS-84  Power consumption 45mA (Average)  WaterproofYes  Baud Rate: 4800bps  Operating Temperature-40ºC ~ +80ºC  Storage Temperature-20ºC ~ +60ºC  Operating Humidity5% ~ 95%  Cable Length5ft

By Dr. Xinwen Fu4 gpsd  Is a service daemon that monitors one or more GPSes attached to a host computer through serial or USB ports  Makes all data on the location/course/velocity of the sensors available to be queried on TCP port 2947 of the host computer  Responds to queries with a format that is substantially easier to parse than the NMEA 0183 emitted by most GPSes  Includes a linkable C service library, a C++ wrapper class, and a Python module that developers of gpsd-aware applications can use to encapsulate all communication with gpsd

By Dr. Xinwen Fu5 gpsd Auxiliary Tools  Diagnostic monitoring  Profiling of GPSes  Feeding GPS-aware applications specified track data for diagnostic purposes

By Dr. Xinwen Fu6 Installation 1.Plug Deluo USB GPS Pro+ SiRFstarIII into the usb port 2.Download the source of version 2.37source 3.Compile it tar zxvf gpsd-2.37.tar.gz cd gpsd-2.37./configure make make install (Note: I cannot compile xgps and a few other tools; needs dbus installed and configured) 4.Start gpsd: the GPS device is nased ttyUSB0 gpsd /dev/ttyUSB0 gpsd /dev/ttyS0 5.Test gpsd cgps

By Dr. Xinwen Fu7 Collect Position Data  Log the position data into a file cgpxlogger > position-data-file.xml ctrl-c to stop the data collection  Load the xml data into excel Open the xml file with excel Ok the default choices

By Dr. Xinwen Fu8 Sample Imported Data in Excel

sirfmon  Monitor and control a SiRF GPS in binary mode  Start sirfmon via the serial port in the binary mode sirfmon /dev/ttyUSB0  When the GPS is in the binary mode, it outputs all the messages except those poll/response message We can program to send a poll message Under sirfmon, we can use the “s” command to send a poll command. Note: there is no space between a sirfmon command and the payload By Dr. Xinwen Fu9

Sirmon (Continued)  The function that decode the binary output messages static void decode_sirf(unsigned char buf[], int len) /* buf has the whole binary data */ Code is changed by Fu to process Messages 7, 28 (0x1C), 30 (0x1E). Search XINWENFU for the changed code  Added functions to convert the data to be properly interpreted on a PC static double getdbl(unsigned char *buf, int off) /* this function is for converting double-precision value and may need to be changed if another GPS product is used. Refer to sirf binary protocol manual p. 3-33*/ static float getsgl(unsigned char *buf, int off) /* this function is for converting single-precision value */  Example to send a poll to the device /* probe for version */ putbyte(buf, 0, 0x84); putbyte(buf, 1, 0x0); (void)sendpkt(buf, 2, device); By Dr. Xinwen Fu10

By Dr. Xinwen Fu11 Converting Addresses to/from Latitude/Longitude in One Step  Convert Convert

By Dr. Xinwen Fu12 Wardriving by kismet+gpsmap

By Dr. Xinwen Fu13 Use gpsmap  Installation yum install ImageMagick yum install ImageMagick-devel yum update dbus Download, compile, and install kismet  Run gpsmap gpsmap –S 3 –t –p –o test.jpg –e Kismet-Oct- Oct gps

By Dr. Xinwen Fu14 References  Deluo USB GPS Pro+ SiRFstarIII, 2007 Deluo USB GPS Pro+ SiRFstarIII  gpsd, 2007 gpsd  Stephen P. Morse, Converting Addresses to/from Latitude/Longitude in One Step, 2004Converting Addresses to/from Latitude/Longitude in One Step  Mike Shannon, Linux Wireless, 2007Linux Wireless  Kismet Installation, 2006 Kismet Installation  FC6 Wireless Auditing Laptop: HOWTO, February 07HOWTO  Kismet - Google Maps, 2007 Kismet - Google Maps  PRODUCING WIRELESS MAPPING WITH KISMET, 2006 PRODUCING WIRELESS MAPPING WITH KISMET  Kismet, 2007 Kismet