NEX ROBOTICS MT3318 Manuale utente

GPS Receiver MT3318

NEX Robotics Pvt. Ltd. 1

www.nex-robotics.com

GPS Receiver MT3318

Figure 1: GPS Receiver MT3318 top and bottom view

Introduction

GPS Receiver MT3318 is based on the MediaTek MTK MT3318 chipset. It has active

patch antenna from Cirocomm. It can track 51 satellites simultaneously. This GPS

receiver gives data output in standard NMEA format with update rate of 1 second at 9600

bps. Receiver has onboard battery for memory backup for quicker acquisition of GPS

satellites. Receiver has 8 pin male berg connector with 2mm pitch. 8 pin female berg

connector comes with this GPS module for external connections.

Note: You may also require general purpose PCB with 2mm pitch for mounting the

receiver on the PCB.

Specifications

•Supply: 3.3V, 45mA

•Chipset: MTK MT3318

•Antenna: High gain GPS patch antenna from Cirocomm

•Data output: CMOS UART interface at 3.3V

•Protocol: NMEA-0183@9600bps (Default) at update rate of 1 second.

•Protocol message support: GGA, GSA, GSV,RMC, VTG

•No. of Satellite simultaneously tracked: 51

•Tracking Sensitivity: On-module antenna : -157 dBm

•Position Accuracy : <3 m

•Max. Update Rate：5Hz (Default: 1 Hz)

•Time to First Fix (Open sky and stationary position)

oObscuration recovery: 0.1 second average

oHot start: <1 seconds average

oWarm start: <34 seconds average

oCold start: <36 seconds average

•Size: 26mm x 26mm x11.7mm

GPS Receiver MT3318

NEX Robotics Pvt. Ltd. 2

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Kit Contains:

•GPS Receiver MT3318

•8 pin Female berg connector with 2mm pitch

•Documentation CD with terminal software from the NEX Robotics and GPS

Cockpit NMEA terminal software

GPS Receiver MT3318

NEX Robotics Pvt. Ltd. 3

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Mechanical Dimension:

Figure 2: Mechanical Dimensions

Figure 3: Inside view of the GPS receiver

GPS Receiver MT3318

NEX Robotics Pvt. Ltd. 4

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GPS Receiver MT3318 is also available in the following form factors

GPS Receiver MT3318 Module

GPS Receiver is soldered on the PCB with 3.3V low drop voltage regulator, 5V to 3.3V

logic level converter, LEDs for TX, RX and Power.

GPS Receiver MT3318 USB Module

By using this you can be directly interfaced GPS with the PC via USB port. GPS

Receiver is soldered on the PCB with 3.3V low drop voltage regulator, 5V to 3.3V logic

level converter, LEDs for TX, RX and Power has onboard USB module

Connections

GPS receiver has 8pin male berg connector with 2mm pitch for the connections. Table 1

shows the pin connections.

VCC (Pin1) 3.3V DC Supply voltage

GND (Pin2) Ground

RX (Pin3) Receiver pin (on this pin give data from external circuit)

TX (Pin4) Transmitter pin (on this pin get data from satellite)

V-ANT (Pin5) 3.3V DC Supply for external antenna

GND(Pin6) Ground

RESET(Pin7) Please keep no connection (N/C) it remain high when power is on

EXANT(Pin8) External Antenna input pin

Table 1: GPS Receiver MT3318 pin connections

You can use 8 pin female berg connector with 2mm pitch for connections which comes

with the GPS receiver.

Interfacing Microcontroller which is working on 3.3V with the GPS receiver:

Microcontroller interfacing at 3.3V is fairly strait forward process. All you have to do

connect TXD of the uC to RXD of the GPS and RXD of the uC to TXD of the GPS

receiver. And give common ground.

Figure 4: GPS interfacing with the microcontroller at 3.3V logic level

GPS Receiver MT3318

NEX Robotics Pvt. Ltd. 5

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Interfacing Microcontroller which is working on 5V with the GPS receiver:

Figure 5: GPS interfacing with the microcontroller at 5V logic level

In this case microcontroller is working at 5V while GPS receiver is operating at 3.3V.

TXD pin of the microcontroller will have 5V logic level while RXD pin of the GPS will

be operating at 3.3V. We need to use voltage divider network of the resistors to scale

down voltage level of TXD pin of the microcontroller to less than 3.3V.Figure 5 shows

voltage divider network consist of 2.2K ohm and 4.7K ohm resistors which scales down

5V approximately by the factor of 2/3

TXD pin of the GPS receiver can be directly connected to the microcontroller’s RXD pin.

Also connect common ground between both of the devices.

GPS Receiver MT3318

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Acquiring the GPS data:

GPS data can be received by the microcontroller or on the PC using any terminal

software. Following example shows the GPS data acquisition on the PC using terminal

software from the NEX Robotics.

If you are using Serial terminal from NEX Robotics then follow bellow steps

Step1: Install the terminal software from NEX Robotic on the PC which is located in the

documentation CD.

Step 2: Select COM Port in serial terminal setting column.

Step 3: Set Baud rate to 9600

Step 4: Set parity to none, Data bits to 8 and stop bits to one.

Step 5: click on connect button for connection

Connecting GPS module with the PC:

Connect GPS module with the PC using Serial port via MAX232 or equivalent TTL to

RS232 converter or using any USB to Serial Converter.

Note: If you are using USB to Serial Converters from NEX Robotics then for installing

drivers, refer to the respective product manuals.

GPS data accusation on the PC:

When GPS module inside the room:

Figure 6

GPS Receiver MT3318

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Figure 6 shows data when GPS module inside the room. You will not get any data also it

will not detect any satellite inside the room.

When GPS module outside the room:

Figure 7

Figure 7shows data when GPS module outside the room. You will get perfect data in

NMEA-0183 format at 9600bps.

GPS Receiver MT3318

NEX Robotics Pvt. Ltd. 8

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You can also use GPS Cockpit software to see GPS Data on PC

Figure 8

GPS Receiver MT3318

NEX Robotics Pvt. Ltd. 9

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GPS Cockpit software is very easy software for GPS data study. It shows GPS data in

different windows. Like you can directly get latitude and longitude on GPS information

window, you can also find out distance between two points in survey window. In signal

quality window displays the signal to noise ratio or carrier to noise. You can also see

satellite position in sky view window.All other important GPS data you can see it on

NMEA terminal window.

Install the GPS Cockpit software on the PC which is located in the documentation CD.

First Set com port and baud rate 9600 in sitting option. Then click Play NMEA file option

Figure 8 shows NMEA cock pit terminal window it having

1:- NMEA Terminal window

2:- Signal quality window

3:- GPS information window

4:- Sky view window

5:- Survey view window

For more information about Cockpit software you can Refer GPS Cockpit user manual

located in the documentation CD.

GPS Receiver MT3318

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NMEA protocol explanation:

1: GPGGA - Global Positioning System Fix Data

2: GPGSA - GPS DOP and active satellites

3: GPGSV - GPS Satellites in view

4: GPRMC: Recommended minimum specific GPS/Transit data

5: GPVTG: Track Made Good and Ground Speed.

GPGGA: Global Positioning System Fix Data

Name Example

Data Description

Sentence Identifier $GPGGA Global Positioning System Fix Data

Time 170834 17:08:34 Z

Latitude 4124.8963, N 41d 24.8963' N or 41d 24' 54" N

Longitude 08151.6838,

W 81d 51.6838' W or 81d 51' 41" W

Fix Quality:

- 0 = Invalid

- 1 = GPS fix

- 2 = DGPS fix

1 Data is from a GPS fix

Number of Satellites 05 5 Satellites are in view

Horizontal Dilution of Precision

(HDOP) 1.5 Relative accuracy of horizontal position

Altitude 280.2, M 280.2 meters above mean sea level

Height of geoid above WGS84

ellipsoid -34.0, M -34.0 meters

Time since last DGPS update blank No last update

DGPS reference station id blank No station id

Checksum *75

Used by program to check for transmission

errors

Courtesy of Brian McClure, N8PQI.

Global Positioning System Fix Data. Time, position and fix related data for a GPS receiver.

eg2. $--GGA,hhmmss.ss,llll.ll,a,yyyyy.yy,a,x,xx,x.x,x.x,M,x.x,M,x.x,xxxx

hhmmss.ss = UTC of position

llll.ll = latitude of position

a = N or S

yyyyy.yy = Longitude of position

a = E or W

x = GPS Quality indicator (0=no fix, 1=GPS fix, 2=Dif. GPS fix)

xx = number of satellites in use

x.x = horizontal dilution of precision

x.x = Antenna altitude above mean-sea-level

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