SIM68V

Материал из Wiren Board
Это утверждённая версия страницы. Она же — наиболее свежая версия.
Другие языки:

Brief characteristics:


  • Mt3333 CHIPSET, MediaTek
    • Number of channels: 33 for tracking, 99 for capturing
    • Navigation systems: GLONASS/GPS/GALILEO/GZSS
    • Accuracy : 2.5 m (CEP, 50% 24 hours)
    • Sensitivity:
      • Tracking: - 167dBm
      • Navigation: -157dBm
      • Cold Start: -148dBm
    • TTFF:
      • Cold start: 28 sec (typical value)
      • Hot start: 1 sec (typical value)
    • Working with re-reflected signals
    • SBAS (WAAS, EGNOS, GAGAN, MSAS)
    • Functions:
      • The forced choice of operation mode: GPS Only, GLONASS Only or GPS/GLONASS
      • AlwaysLocate (adaptive operation of the receiver depending on the movement to save energy)
      • EPO/Hot Still (application of approximated ephemerides downloaded from the server for 7/14/30 days)
      • EASY (independent approximation of the ephemeris for 3 days in advance)
      • LOCUS (storage of tracks in memory)
      • AIC (suppression of noise harmonics with information about their presence - Jamming)
    • Protocol: NMEA 0183/MTK
    • The frequency of the output messages up to 10Hz (1Hz default)
    • The speed of exchange UART: 4800...921600 bps (115200 or 9600 bps by default)
    • Antenna type: active/passive
    • Power supply: 2.8...4.3 V, 27mA GLONASS+GPS mode with continuous tracking
    • Operating temperature range -40°C...+85°C



on Wiren Board

Connected to the SC16IS752 chip. Linux port: /dev/ttyNSC1. The default speed is 9600. (Some modules may have a speed of 115200). Output protocol NMEA sentences.

Port configuration: 

stty -F /dev/ttyNSC1 line 0 ignbrk -brkint -icrnl -imaxbel -opost -onlcr -isig -icanon -iexten -echo -echoe -echok -echoctl -echoke 9600

Terminal (operation check): 

minicom /dev/ttyNSC1


Management

The GPS module can be controlled by sending mt3333 chipset proprietary commands to THE port. For a list of commands, see documentation.

Examples of useful commands are given below.


Disabling the module

161 PMTK_CMD_STANDBY_MODE command. Deactivates the module to reduce power consumption. To activate the module, send any byte to the port. 

echo -e "\$PMTK161,0*28\r" > /dev/ttyNSC1

In Wiren Board controller rev. 2.8 the external active antenna is not powered off when the module is put into power saving mode. To power off the external active antenna, the entire 3.3 V power bus must be disconnected..


AlwaysLocate

AlwaysLocate mode is an adaptive operation of the receiver depending on the movement to save power consumption. In this mode, the receiver periodically falls asleep and wakes up, and the frequency and duration of the modes is determined automatically.

225 PMTK_CMD_PERIODIC_MODE

Return to normal operation mode: 

echo -e "\$PMTK225,0*2B\r" > /dev/ttyNSC1

AlwaysLocate (TM) standby mode: 

echo -e "\$PMTK225,8*23\r" > /dev/ttyNSC1

AlwaysLocate (TM) backup mode: 

echo -e "\$PMTK225,9*22\r" > /dev/ttyNSC1



AGPS

The chipset supports downloading tables of coordinates, e.g. ephemerides, downloaded from the server to speed up the start. Ephemerides loaded into the module are stored in the internal flash memory of the module.

Read more: http://electronix.ru/forum/index.php?s=&showtopic=114152&view=findpost&p=1177669

The download is proceed using a simple binary protocol. There is no ready-made implementation for Linux yet.


Documentation

Источник — https://wirenboard.com/wiki/index.php?title=SIM68V/en&oldid=19304