Navika-300

Miniature High Performance GPS-SBAS Module
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Features  
  • Stand-alone GPS positioning module
  • 16 parallel channels for Acquisition and Tracking
  • High performance Correlator for ultra low signal detection and tracking
  • Extremely fast fix times
  • 12mm x 16mm form-factor
  • Single 3.3V input supply
  • Edge half-PTH connection points for easy assembly
  • NMEA0183 compatible message format and Custom binary message for host communication
Navika-300
Product Description

Navika-300 is a L1, C/A code based GPS-SBAS receiver module. Its superior acquisition and tracking sensitivity ensures continuous location availability under poor visibility conditions and even indoors.

Navika-300 is a 12.2mm x 16mm module catering to applications that demand high performance from a GPS module at a form-factor that is compatible with several GPS modules in the market.

Navika-300 supports sub-second positioning in hot start and reacquisition while providing faster location under warm and cold start modes too.

Navika-300 can be interfaced to either active or passive GPS antenna. In addition, the module provides protection/detection circuitry for accidental short/open of the active GPS antenna.

The module provides plethora of interfaces. An SPI port, TWI 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 three general purpose I/Os that can be used to drive LEDs or accept external interrupt signal.

Navika-300 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-300 Module Details  

The Navika-300 brings out some of the essential peripherals for host interface such as SPI port, TWI port, UART port, USB port and GPIOs.

The Navika-300 is targeted for applications that require positioning and/or timing outputs. In addition to the user co-ordinates, Navika-300 is capable of delivering unmatched timing accuracy. Typical applications where Navika-300 could be integrated are

  • Vehicle tracking
  • Security
  • Geo-tagging
  • Wireless base-stations
The Navika-300 is a 12.2mm x 16mm sized GPS module. It requires a 3.3V supply for he digital section, 3.0V for RF section and 1.2V 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. The module has a metal shield over the component area to

The connection details and the mechanical information are provided below.

Navika-300 Connection Diagram  

In order to build a complete GPS 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-300.

  • Connect a 50Ω trace between the RF_IN pad and the antenna connector
  • Connect a 20Ω, 1W resistor between the ANT_SENSE and RFVCC_3V0. This is required to sense a short circuit on the antenna power line as well as to protect the power-ground short circuit. If this function is not required, the ANT_SENSE and RFVCC_3V0 pads can be directly connected
  • 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 50mA (excluding antenna current). It is recommended to mount a decoupling capacitor of 1uF close to the DVCC_3V3 pad
  • A voltage of 3.0V +/- 5% should be applied to RFVCC_3V0 pad. This supply is required for the RF front-end section. This is optional and the pad can also be connected to DVCC_3V3 pad
  • A backup battery of 1.2V should be applied at VBAT_1V2 pad. The recharge circuitry (in case of a rechargeable battery) should be provisioned on the motherboard


Specifications of Navika-300 Module  
Performance Characteristics
Receiver 16 channels L1-C/A code GPS
 
Sensitivity
Acquisition
-155dBm (Hot start, 1SV @ -140dBm)
-160dBm (Reacquisition)
Tracking -163dBm
 
Time To First Fix
Hot Start(with valid ephemeris, almanac, position and time estimate) 2 sec (typical) switch OFF/ON cycle less than 1 hour
Warm Start(with almanac, position and time estimate) 30 sec (typical)
Cold Start (without almanac, time, or position) 35 sec (typical)
 
Accuracy
Position (Horizontal) 10 m (90% without S/A)
Velocity 0.1 m/sec (90% without S/A)
 
Reacquisition
Signal < 1 sec
Position < 1 sec
Blockage Time 3 minutes
 
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 50mA @ 3.3V
GPS MIPS on ARM 25
 
Output Messages
NMEA $GPGGA, $GPGSA, $GPRMC, $GPGLL, $GPGSV, $GPVTG, $GPZDA
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
 
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