Global Sat ET-318 User manual

環天衛星科技股份有限公司

PRODUCT USER MANUAL

GPS ENGINE BOARD

ET-318

Version 1.0

GlobalSat Technology Corporation

台北縣中和市建一路186 號16 樓(遠東世紀廣場)

16, No.186,Chien 1 Road, 235Chung Ho City,Taipei Hsien, Taiwan ,R.O.C.

Tel: 886-2-8226-3799(Rep.) Fax: 886-2-8226-3899

Web: www.globalsat.com.tw E-mail:[email protected]

Features:

SiRF starⅢhigh performance GPS Chip Set

Very high sensitivity (Tracking Sensitivity: -159 dBm)

Extremely fast TTFF (Time To First Fix) at low signal level

Compact size (15.2mm * 14 mm * 2.8mm) suitable for space-sensitive application

One size component, easy to mount on another PCB board

Support NMEA 0183 and SiRF binary protocol

Specification:

General

Chipset SiRFStarⅢ

Frequency L1, 1575.42 MHz

C/A code 1.023 MHz chip rate

Channels 20 channel all-in-view tracking

Sensitivity -159 dBm

Accuracy

Position 10 meters, 2D RMS

5 meters, 2D RMS, WAAS enabled

Velocity 0.1 m/s

Time 1us synchronized to GPS time

Datum

Default WGS-84

Acquisition Time

Reacquisition 0.1 sec., average

Hot start 1 sec., average

Warm start 38 sec., average

Cold start 42 sec., average

Dynamic Conditions

Altitude 18,000 meters (60,000 feet) max

Velocity 515 meters /second (1000 knots) max

Acceleration Less than 4g

Jerk 20m/sec **3

Power

Main power input 3.3V +- 5% DC input

Power consumption 42mA (Continuous mode)

36mA (Trickle power mode

Interface

Dimension 15.2mm * 14 mm * 2.8mm

Baud rate 4,800 to 57,600 bps adjustable

Output message SiRF binary or

NMEA 0183 GGA, GSA, GSV, RMC, VTG, GLL

GPS Passive (orActive )AntennaSpecification(Recommendation)

Frequency: 1575.42+2 MHz

Axial Ratio: 3 dB Typical

output Impedance: 50Ω

Polarization: RHCP

Output VSWR: 1.5 Max.

Active option

Low Noise Amplifter:

Amplifier Gain :20~26dB Typical

Output VSWR: 2.0 Max.

Noise Figure: 2.0 dB Max.

Environmental

Operating Temperature -40℃to +85℃

Storage Temperature: -40℃to +85℃

Pin Assignment

Pin Signal Name I/O Description

1GND GAnalog Ground

2RF_IN RF GPS Signal input

3GND G Analog Ground

4NRESET IReset (Active low)

5VCC_IN PWR DC Supply Voltage input

6VBAT PWR Backup voltage supply

7RXB ISerial port B

8TXB O Serial port B

9GND G Analog Ground

10 BOOTSEL Boot mode

11 TXA O Serial port A

12 RXA ISerial port A

13 GPIO1 IGeneral –purpose I/O

14 GPIO14 IGeneral –purpose I/O

15 TIMEMARK OOne pulse per second

16 GPIO13 IGeneral –purpose I/O

17 GPIO15 I General –purpose I/O

Definition of Pin assignment

VCC_IN

This is the main DC supply for a 3.3V +- 5% DC input power module board.

GND

provides

the

ground

for

digital

rt.

BOOTSEL

Set

this

high

for

programming

lash.

RXA

This

main

receiver

channel

and

used

receive

ware

commands

the

board

from

SIRFdemo

sof

ware

from

user

written

sof

ware.

PS:

Pull

not

used.

RXB

This

auxiliary

receiving

channel

and

used

input

erential

corrections

the

board

enable

DGPS

navigation.

PS:

Pull

not

used.

TXA

This

the

main

transmitting

channel

and

used

output

navigation

and measuremen

data

SiRFdemo

user

written

software.

TXB

For

user’s

application

(not

currently

used).

RF_IN

This

receiver

signal

GPS

analog

.due

the

characteristics

the

signal

the

design

has

certain

criteria.

The

line

the

PCB

from

the

antenna(or

antenna

connector)

has

controlled

microstrip

line at

PPS

This

provides

one

pulse-per-second

output

from

the

board,

which

is synchronized

GPS

time.

This

not

available

Trickle

Power

mode

Backup

battery

(V_BAT)

This is the battery backup input that powers the SRAM and RTC when main

power is removed. Typical current draw is 15uA. Without an external backup

battery, the module/engine board will execute a cold star after every turn on.

To achieve the faster start-up offered by a hot or warm start, a battery backup

must be connected. The battery voltage should be between 2.0v and 5.0v.

TIMEMARK

This

provides

one

pulse-per-second

output

from

the

board,

which

is synchronized

GPS

time.

This

not

available

Trickle

Power

mode

GPIO

Functions

Several

I/Os

are

connected

the

digital

interface

connector

for

custom applications

Application Circuit

R46

560R

1 2

TXA

RXB

RESET

BATTERY

GPIO15

50 ohm microstrip line

GPIO13

RXA

SAW FILTER

1 2

U1 GPS

VBAT

VCC_IN

NRESET

GND

RF_IN

GND

RXB

TXB

GND

BOOTSEL

TXA

RXA

GPIO1

GPIO14

TIMEMAR K

GPIO15

GPIO13

GPIO1

3.3V

GPIO14

Antenna

RB715F

BOOTSEL

TXB

0.1U

1 2

option

VCC_RF

TIMEMAR K

LNA

21 ..

Recommend Layout PAD

Mechanical Layout

SOFTWARE COMMAND

NMEA Output Command

GGA-Global Positioning System Fixed Data

Table B-2 contains the values for the following example:

$GPGGA,161229.487,3723.2475,N,12158.3416,W,1,07,1.0,9.0,M,,,,0000*18

Table B-2 GGA Data Format

Name Exam

le Units Descri

tio

Messa

e ID $GPGGA GGA

rotocol heade

UTC Time 161229.487 hhmmss.sss

Latitude 3723.2475 ddmm.mmmm

/S Indicato

=north or S=south

Lon

itude 12158.3416 dddmm.mmm

E/W Indicato

W E=east or W=wes

Position Fix Indicato

1 See Table B-3

Satellites Use

07 Ran

e 0 to 12

HDOP 1.0 Horizontal Dilution of Precision

MSLAltitude19.0 meters

Units M meters

Geoid Se

aration1meters

Units M meters

e of Diff. Corr. second

ull fields when DGPS is not used

Diff. Ref. Station ID 0000

Checksu

*18

<CR><LF> End of messa

e termination

SiRF Technology Inc. does not support geoid corrections. Values are WGS84 ellipsoid heights.

Table B-3 Position Fix Indicator

Value Descri

tion

0 Fix not available or invali

1 GPS SPS Mode, fix vali

2 Differential GPS, SPS Mode , fix vali

3 GPS PPS Mode, fix vali

GLL-Geographic Position-Latitude/Longitude

Table B-4 contains the values for the following example:

$GPGLL,3723.2475,N,12158.3416,W,161229.487,A*2C

TableB-4GLLDataFormat

Name Exam

le Units Descri

tion

Messa

e ID $GPGLL GLL

rotocol heade

Latitude 3723.2475 ddmm.mmmm

/S Indicato

=north or S=south

Lon

itude 12158.3416 dddmm.mmm

E/W Indicato

W E=east or W=wes

UTC Position 161229.487 hhmmss.sss

Status A A=data valid or V=data not valid

Checksu

*2C

<CR><LF> End of messa

e termination

GSA-GNSS DOP and Active Satellites

Table B-5 contains the values for the following example:

$GPGSA,A,3,07,02,26,27,09,04,15,,,,,,1.8,1.0,1.5*33

TableB-5GSADataFormat

Name Example Units Description

Message ID $GPGSA GSA protocol header

Mode1 A See Table B-6

Mode2 3 See Table B-7

Satellite Used107 Sv on Channel 1

Satellite Used102 Sv on Channel 2

…..

Satellite Used1Sv on Channel 12

PDOP 1.8 Position dilution of Precision

HDOP 1.0 Horizontal dilution of Precision

VDOP 1.5 Vertical dilution of Precision

Checksum *33

<CR><LF> End of message termination

1. Satellite used in solution.

TableB-6Mode1

Value Description

M Manual-forced to operate in 2D or 3D mode

A 2Dautomatic-allowed to automatically switch 2D/3D

TableB-7Mode2

Value Description

1 Fix Not Available

2 2D

3 3D

GSV-GNSS Satellites in View

Table B-8 contains the values for the following example:

$GPGSV,2,1,07,07,79,048,42,02,51,062,43,26,36,256,42,27,27,138,42*71

$GPGSV,2,2,07,09,23,313,42,04,19,159,41,15,12,041,42*41

TableB-8GSVDataFormat

Name Exam

le Descri

tio

Messa

e ID $GPGSV GSV

rotocol heade

umber of Messa

es12 Ran

e 1 to 3

Messa

e Numbe

11 Ran

e 1 to 3

Satellites in View 07

Satellite ID 07 Channel 1

(

Ran

e 1 to 32

)

Elevation 79 de

rees Channel 1

(

Maximum90

)

Azimuth 048 de

rees Channel 1

(

True

Ran

e 0 to 359

)

SNR

(

C/No

)

42 dBHz Ran

e 0 to 99

null when not trackin

……. …….

Satellite ID 27 Channel 4

(

Ran

e 1 to 32

)

Elevation 27 De

rees Channel 4

(

Maximum90

)

Azimuth 138 De

rees Channel 4

(

True

Ran

e 0 to 359

)

SNR

(

C/No

)

42 dBHz Ran

e 0 to 99

null when not trackin

Checksu

*71

<CR><LF> End of messa

e termination

Depending on the number of satellites tracked multiple messages of GSV data may be required.

RMC-Recommended Minimum Specific GNSS Data

Table B-10 contains the values for the following example:

$GPRMC,161229.487,A,3723.2475,N,12158.3416,W,0.13,309.62,120598,,*10

TableB-10RMCDataFormat

Name Exam

le Units Descri

tio

Messa

e ID $GPRMC RMC

rotocol heade

UTC Time 161229.487 hhmmss.sss

Status A A=data valid or V=data not valid

Latitude 3723.2475 ddmm.mmmm

/S Indicator

=north or S=south

Lon

itude 12158.3416 dddmm.mmm

E/W Indicato

W E=east or W=wes

eed Over Ground 0.13 knots

Course Over Ground 309.62 de

rees True

Date 120598 ddmm

netic Variation2de

rees E=east or W=wes

Checksu

*10

<CR><LF> End of messa

e termination

SiRF Technology Inc. does not support magnetic declination. All “course over ground” data are

geodetic WGS48 directions.

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