17x22mm2 GPS-GLONASS Module
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  • 17mm x 22.4mm module form-factor
  • GPS-GLONASS positioning and timing module
  • More than 16K Correlators for fast acquisition and robust tracking
  • Fast Time-To-First-Fix
  • Precise 1PPS output with configurable pulse characteristics
  • GPS-only, GLONASS-only and GPS-GLONASS position output
  • Common GPS and GLONASS antenna interface
  • Single 3.3V input supply
  • Edge half-PTH connection points for easy assembly
  • NMEA0183 compatible message format and Custom binary message for host communication
Product Description  

The Navika-250 is a 17mmx22.4mm module combining the advantages of multiple GNSS constellations. By making use of GPS and GLONASS signals, the Navika-250 provides better availability and accuracy of position as compared to a stand-alone GPS or GLONASS module.

Navika-250 caters to applications that demand high performance where a GPS-only module cannot deliver.

Navika-250 supports sub-second positioning in hot start and reacquisition while providing faster location under warm and cold start modes too.

Navika-250 can be interfaced to either active or passive GPS-GLONASS antenna.

The module provides industry standard interfaces for easy interconnection in an application scenario. An SPI port, UART port and a full-speed USB port allow the module to be interfaced in a variety of ways to the outside world. The module also supports four general purpose I/Os that can be used to drive LEDs or digital input-output ports.

For applications that require precise timing, Navika-250 outputs a highly precise pulse every second that is synchronized to the GPS / UTC second boundary. The pulse can be adjusted for edge, width and delay to cater to the equipment that requires the time synchronization. In addition, the timing information can be derived from GPS-only, GLONASS-only or combined modes.

Navika-250 supports NMEA-0183 message protocol to communicate the location information. In addition, Accord proprietary messages convey additional information for a tighter integration with the end application.

Navika-250 Module Details  

The Navika-250 brings out some of the essential peripherals for host interface such as SPI port, UART port, USB port and GPIOs.

The Navika-250 is targeted for applications that require positioning and/or timing outputs. In addition to the user co-ordinates, Navika-250 is capable of delivering unmatched timing accuracy. Typical applications where Navika-250 could be integrated are

  • Vehicle tracking
  • Security
  • Geo-tagging
  • Wireless base-stations
The Navika-250 is a 17mm x 22.4mm sized GPS-GLONASS module. It requires a single 3.3V supply and a 3.0V battery feed that would enable the user to fully exploit all its features.

The module has been designed keeping all components on one side of the PCB and provides half plated through holes (PTH) on two sides for electrical and mechanical connectivity.

Navika-250 Connection Diagram  

In order to build a complete GPS-GLONASS receiver using the module, all it takes are a few connections. The diagram below depicts the interconnections to be done in order to use the Navika-250.

  • Connect a 50Ω trace between the RF_IN pad and the antenna connector
  • Connect a 20Ω, 1W resistor between the ANT_SENSE and ANT_VCC_3V pads. This is required to sense a short circuit on the antenna power line as well as to protect the power-ground short circuit
  • An active low power ON reset of at least 25ms should be provided on the /RESET pad
  • The host communication can be tapped at the UART1_RXD and UART1_TXD lines
  • Mains power of 3.3V +/- 5% should be applied at DVCC_3V3 pad. The maximum current draw of the board would be about 80mA (excluding antenna current). It is recommended to mount a decoupling capacitor of 1uF close to the DVCC_3V3 pad
  • A backup battery of 3.0V should be applied at VBAT_3V0 pad. The recharge circuitry (in case of a rechargeable battery) should be provisioned on the motherboard

Specifications of Navika-250 Module  
Performance Characteristics
Receiver 32 channels L1-C/A code GPS-GLONASS, SBAS
-155dBm (Hot start, 1SV @ -140dBm)
-160dBm (Reacquisition)
Tracking -162dBm (GPS) / -159dBm (GLONASS)
Time To First Fix
Hot Start(with valid ephemeris, almanac, position and time estimate) 1 sec (typical) switch OFF/ON cycle less than 1 hour
Warm Start(with almanac, position and time estimate) 18 to 36 sec (typical, open sky)
Cold Start (without almanac, time, or position) 18 to 36 sec (typical, open sky)
Position (Horizontal) 10 m (90% without S/A)
Velocity 0.1 m/sec (90% without S/A)
Signal < 1 sec
Position < 1 sec
Blockage Time 3 minutes
1PPS < +/- 10ns, 1σ without errors
Pulse Width 400us (adjustable between 400us to 39.6ms in steps of 400us)
Pulse Edge Rising (configurable)
Pulse Delay 0ns (adjustable between 999 to +999ns)
Single Satellite PPS
Min. C/N0 12dB-Hz (adjustable between 12dB-Hz and 60dB-Hz; default is 35dB-Hz)
Min. Elevation Mask 7 deg
Position averaging 50s minimum, extends upto 1000s
Validity of 1PPS 6 hours continuously in single satellite PPS mode
Navigation Solution
PVT 2D/3D position, velocity, and time 183 geodetic datum supported (default) (WGS84)
Position Update Rate 1 Hz
PC/Host Communication
Interface UART
Baud Rate 115200
Message Formats NMEA0183 Ver. 3.01 ASCII, as well as proprietary messages
Environmental Characteristics
Operational Temperature Range (Ambient) -40C to +85C
Storage Temperature Range -65C to +150C
Humidity 95% non-condensing +30C to 60C
Altitude 18,000 meters
Electrical Characteristics
Total Current Consumption 100mA @ 3.3V
Output Messages
NMEA $GP, $GL, $GN messages
ASCII Version, Kalman Filter, Receiver Configuration, Antenna Status, PPS mode
Input Messages
ASCII NMEA message control and configuration, Elevation mask, DOP settings, Factory reset, Restart, 1PPS configuration