Global Sat ET-333 Manuale utente

環天衛星科技股份有限公司

PRODUCT USER MANUAL

GPS ENGINE BOARD

ET-333

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 (40.5mm * 35 mm * 10mm) suitable for space-sensitive application

Support NMEA 0183 and SiRF binary protocol

Build-in SuperCap to reserve system data for rapid satellite acquisition.

Cold start under 40 seconds, average

Hot start under 1 seconds, average

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 3.8V ~ 6.5V DC input

Power consumption 70mA (Continuous mode)

60mA (Trickle power mode)

Interface

Baud rate 4,800 to 57,600 bps adjustable

Output message SiRF binary or

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

Environmental

Operating Temp -40℃to +85℃

Physical Characteristics

Interface Connection

* Pin-out of the 12-pin interface connector

Number

Name

Description

Type

GND Ground

VBAT

Backup Battery

Input

VDC

3.8V~5.5V DC Power Input

Input

PBRES

Push Button Reset Input (Active Low)

Input

GPIO1

(Reserved)

TXA

Serial Data Output A (GPS Data)

Output

RXA

Serial Data Input A (Command)

Input

GND

Ground

GND

Ground

SELECT

(Reserved)

TIMEMARK

1PPS Time Mark Output

Output

GND

Ground

Interface description

* VDC (DC power input):

This is the main DC supply for a 3.8V ~ 5.5V power module board.

* VBAT (Backup battery):

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

power is removed .Typical current draw is 10uA. 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. To

maximize battery lifetime, the battery voltage should be between 2.5v and 3.6v.

* PBRES (Push button reset):

This pin provides an active-low reset input to the engine board. It causes the

engine board to reset and start searching for satellites.

* SELECT :

Do not connect.

* TXA :

This is the main transmits channel for outputting navigation and measurement

data to user’s navigation software or user written software.

Output TTL level , 0V ~ 2.85V

* RXA :

This is the main receive channel for receiving software commands to the engine

board from SiRFdemo software or from user written software.

Normally this pin must be kept in high, and if you don’t use this pin please

connect a resistor to pull high.

* Time mark :

This pin provides one pulse-per-second output from the engine board that is

synchronized to GPS time.

* GND :

GND provides the ground for the engine board. Connect all grounds.

* RF_IN(MMCX connector) :

This pin receives signal of GPS analog via active antenna .

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

(

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.

VTG-Course Over Ground and Ground Speed

$GPVTG,309.62,T,,M,0.13,N,0.2,K*6E

Name Exam

le Units Descri

tio

Messa

e ID $GPVTG VTG

rotocol heade

Course 309.62 de

rees Measured headin

Reference T True

Course de

rees Measured headin

Reference M Ma

netic

eed 0.13 knots Measured horizontal s

eed

Units

Knots

eed 0.2 Km/h

Measured horizontal s

eed

Units K Kilometers

er hou

Checksu

*6E

<CR><LF> End of messa

e termination

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