Hệ thống GPS và thi công module sim908

The Global Positioning System (GPS) is a spacebased global navigation satellite system (GNSS) that provides location and time information in all weather, anywhere on or near the Earth, where there is an unobstructed line of sight to four or more GPS satellites. In addition to GPS, other systems are in use or under development.

Electrical & Electronics Faculty

PROJECT: Global Positioning System

GPS module Receive and Application

CONTENT

The Global Positioning System (GPS) is a

space-based global navigation satellite system (GNSS) that

provides location and time information in all

weather, any-where on or near the Earth, where

there is an unobstructed line of sight to four or more

GPS satellites In addition to GPS, other systems are

in use or under development

Nowadays, GPS becomes the most popular system for positioning applications It is used for tracking, mapping, navigation, measurement include military applications, civilian use This report focuses on the way using Sim908 and LM3S3749 to find out position, assemble data and then draw them on Google Earth

SIM 908 Module

Some application of SIM 908

• GSM : SMS, phone call…

• Internet, Interface

In this project, we focused on GPS to take position

GPS Application Interface

• Sim908 provide high-performance L1 GPS solution for cellular handset application The solution offer best-in-class acquisition and tracking sensitivity, Time-To-First-Fix (TTFF) and accuracy The GPS engine supports both fully-autonomous operation for use in handheld consumer navigation devices and other standalone navigation systems

• The GPS NMEA information is output by DEBUG port. The default baud rate is 115200bps

• The GPS engine is controlled by GSM engine, so when it is necessary to rub GPS the GSM engine must be powered on and not in SLEEP mode

• All the GPS function is controlled by AT command via serial port The GPS function AT commands are listed in the following table

GPS Operation Mode

• Active mode: GPS is active as a GPS receiver The GPS engine will automatically acquire and track GPS satellites

• Power down mode: The GPS engine will be set into this mode by sending AT command

“AT+CGPSPWR=0” In this mode the internal power supply for GPS will be shutdown and the current consumption is very low The last position, current time and ephemeris data will be stored in the GS host memory

• Power on GPS engine : by sending AT command “AT+CGPSPWR=1”

• Power down GPS engine: by sending AT command “AT+CGPSPWR=0”

• GPS Antenna Interface : The RF interface has an impendence of 50 Ω

SIM Card Interface

Pin description of SIM card

Reference circuit of the 8-pin

SIM card holder

SD-card Module

The SD-Card is a standardized flash memory

storage device that is the mechanically compatible

successor of the MMC-Card SD stands for Secure

Digital Typically a file system like FAT16 will be

applied to such a device Alternate file systems are

possible, e.g the optimized Linux flash file systems,

at the price of only being able to read the data in

other common systems only with extra efforts

Micro-Controller LM3S3749

The ARM® Cortex™-M3 processor

provides a high-performance, low-cost

platform that meets the system

requirements of minimal memory

implementation, reduced pin count,

and low power consumption, while

delivering outstanding computational

performance and exceptional system

response to interrupts

• Module ARM: main processor, send AT command to module SIM908 (GPS), handle the data received then save them to memory of SD Card

• Using GUI to display location from the SD Card to computer by Google Earth service

Algorithm Description

Algorithm Description

Algorithm Description

DTR

RTS

TXD

TXD 1

RXD 5

DTR_N 2

VDD_232 4

RTS_N 3

RI_N 6

GND1 7

VDD 8

DSR_N 9

DCD_N 10

CTS_N 11

SHTD_N 12

EE_CLK 13

EE_DATA

14

DP

15 DM

16 VDD_3V3

17 GND_3V3

18 RESET

19 VDD1

20 GND

21 TRI_STATE

22 LD_MODE

23 VDD_PLL

24 GND_PLL

25 PLL_TEST

26 OSC1

27 OSC2

28

U01

PL2303

PL_DP PL_DM

GND

GND

GND

GND

GND

GND

3V3

R23

4k7

R24

27

R25

27

R26

1k5

C21

10p

C22

10p

C23

100n

C25

100n

C24

10u

XT2

12M

3V3

USB_5V USB_5V

SD Card Module

PL2303

Development Board

P2

JTAG 20 pin

GND

3V3

TDI

TMS

TCK

TDO

nRST

3V3

2 1

SW2

GND

R05

10k

3V3

D2 R2

1k

3V3

1

2

P3

IOTEST C_SW

100n

J-tag Debug Port IO of Lm3s3749

Development Board

Development Board

PA0/U0RX 26

PA1/U0TX 27

PA2/SSI0CLK 28

PA3/SSI0FSS 29

PA4/SSI0RX 30

PA5/SSI0TX 31

PC0/TCK/SWCLK 80

PC1/TMS/SWDIO 79

PC2/TDI 78

PC3/TDO/SWO 77

PC4/CCP5 25

PC5/C1+

24

PC6/PHB0 23

PC7/C1O 22

PD0/U2RX

10

PD1/U2TX

11

PD2/CCP6

12

PD3/CCP0

13

PE2/SSI1RX 95

PE3/SSI1TX 96

PD6/ADC5

99

PD7/ADC4

100

GND 9

GND 15

GND 21

GND 33

RSTN

64

LDO

7

OSC0 48

OSC1 49

PB0/U1RX

66

PB1/U1TX

67

USB0DM

70

USB0DP

71

PB4/C0-92

PB5/C1-91

PB6/C0+

90

PB7/NMI

89

PB2/I2C0SCL

72

USB0RBIAS

73

PE0/SSI1CLK 74

PE1/SSI1FSS 75

PE4/ADC3 6

PE5/ADC2 5

PA6/CCP1 34

PA7/CCP3 35

PE6/ADC1 2

PE7/ADC0 1

PF0/PWM0

47

PF1/PWM1

61

PF2/PWM4

60

PF3/PWM5

59

PF4/C0O

58

PF5/CCP2

46

PF6/PHA0

43

PF7/CCP4

42

PG0/I2C1SCL 19

PG1/I2C1SDA 18

PG2/FAULT0 17

PG3/FAULT2 16

PG4/FAULT1 41

PG5/IDX0 40

PG6/PWM6 37

PG7/PWM7 36

PH0/PWM2

86

PH1/PWM3

85

PH2/FAULT3

84

PH3/USB0EPEN

83

VDDA

3

PD5/ADC6

98 PD4/ADC7

97

GNDA 4

VDD

8

VDD

20

VDD

32

VDD

44

VDD

56

VDD

68

VDD

81

VDD

93

GND 39

GND 45

GND 54

GND 57

GND 63

GND 69

GND 82

GND 87

GND 94

VDD25

14

VDD25

38

VDD25

62

VDD25

88

WAKEN 50

HIBN 51

XOSC0 52

XOSC1 53

VBAT

55

PB3/I2C0SDA

65

PH4/USB0PFLT

76

LM3S3749-IQC

U1

GND

VBAT

GND

GND

3V3

2 1

SW1

R07

10k

GND

3V3

nWAKE

XT1

8MHz

C07

10p

C06

10p

nRST

TDO TDI

TCK

TMS

PE0

PE1

PE2

PE3

PE4

PE5

PE6

PE7

PA0

PA1

PA2

PA3

PA4

PA5

PA6

PA7

RX0

TX0

PC0

PC1

PC2

PC3

PC4

PC5

PC6

PC7

PB0

PB1

PB2

PB3

PB4

PB5

PB6

PB7

PD0

PD1

PD2

PD3

PD4

PD5

PD6

PD7

PF0

PF1

PF2

PF3

PF4

PF5

PF6

PF7

PG0

PG1

PG2

PG3

PG4

PG5

PG6

PG7

PH0

PH1

PH2

PH3

PH4

R06 9.1k 1%

GND

USB0_DP USB0_DM

nHIB

XOSC0

XOSC1

C11

0.01u

C12

0.01u

C13

0.1u

C14

0.1u

C15

1u

C01

1u

C02

0.01u

C03

0.1u

C04

0.1u

C05

0.01u

Main CPU (LM3S3749)

Development Board

Power supply circuit for SIM 908

SIM Card Circuit Serial Ports Circuit

Development Board

Result

GPS is a good measurement to locate the position exactly

With this project, we can develop more application such as :

• Calculate area

• Determine the way gone of the vehicle

• Apply for “black box” to define position, speed of vehicles

Development : more intergrade

• GPRS, GSM send information to web server in order to manage online

T H A N K

Y O U