Global Sat ET-332 Bedienungsanleitung

環天衛星科技股份有限公司

PRODUCT USER MANUAL

GPS ENGINE BOARD

ET-332

GlobalSat Technology Corporation

台北縣中和市建一路

186

號

樓

(

遠東世紀廣場

)

16, No.186,Chien 1Road, 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 40seconds, average

Hot start under 1seconds, average

Specification:

General

Chipset SiRF StarⅢ

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 75mA (Continuous mode)

30mA (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.

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

Example

Units

Description

Message ID

$GPGGA

GGA protocol header

UTC Time

161229.487

hhmmss.sss

Latitude

3723.2475

ddmm.mmmm

N/S Indicator

N=north or S=south

Longitude

12158.3416

dddmm.mmmm

E/W Indicator

E=east or W=west

Position Fix Indicator

See Table B-3

Satellites Used

Range 0 to 12

HDOP

1.0

Horizontal Dilution of Precision

MSL Altitude

9.0

meters

Units

meters

Geoid Separation

meters

Units

meters

Age of Diff. Corr.

second

Null fields when DGPS is not used

Diff. Ref. Station ID

0000

Checksum

*18

End of message termination

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

Table B-3 Position Fix Indicator

Value

Description

Fix not available or invalid

GPS SPS Mode, fix valid

Differential GPS, SPS Mode , fix valid

GPS PPS Mode, fix valid

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

Table B-4 GLL Data Format

Name

Example

Units

Description

Message ID

$GPGLL

GLL protocol header

Latitude

3723.2475

ddmm.mmmm

N/S Indicator

N=north or S=south

Longitude

12158.3416

dddmm.mmmm

E/W Indicator

E=east or W=west

UTC Position

161229.487

hhmmss.sss

Status

A=data valid or V=data not valid

Checksum

*2C

End of message 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

Table B-5 GSA Data Format

Name Example Units Description

Message ID $GPGSA GSA protocol header

Mode1 ASee Table B-6

Mode2 3See 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.

Table B-6 Mode1

Value Description

MManual-forced to operate in 2D or 3D mode

A2Dautomatic-allowed to automatically switch 2D/3D

Table B-7 Mode 2

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

Table B-8 GSV Data Format

Name

Example

Description

Message ID

$GPGSV

GSV protocol header

Number of Messages

Range 1 to 3

Message Number

Range 1 to 3

Satellites in View

Satellite ID

Channel 1(Range 1 to 32)

Elevation

degrees

Channel 1(Maximum90)

Azimuth

048

degrees

Channel 1(True, Range 0 to 359)

SNR(C/No)

dBHz

Range 0 to 99,null when not tracking

…….

Satellite ID

Channel 4 (Range 1 to 32)

Elevation

Degrees

Channel 4(Maximum90)

Azimuth

138

Degrees

Channel 4(True, Range 0 to 359)

SNR(C/No)

dBHz

Range 0 to 99,null when not tracking

Checksum

*71

End of message 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

Table B-10 RMC Data Format

Name

Example

Units

Description

Message ID

$GPRMC

RMC protocol header

UTC Time

161229.487

hhmmss.sss

Status

A=data valid or V=data not valid

Latitude

3723.2475

ddmm.mmmm

N/S Indicator

N=north or S=south

Longitude

12158.3416

dddmm.mmmm

E/W Indicator

E=east or W=west

Speed Over Ground

0.13

knots

Course Over Ground

309.62

degrees

True

Date

120598

ddmmyy

Magnetic Variation

degrees

E=east or W=west

Checksum

*10

End of message 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

Example

Units

Description

Message ID

$GPVTG

VTG protocol header

Course

309.62

degrees

Measured heading

Reference

True

Course

degrees

Measured heading

Reference

Magnetic

Speed

0.13

knots

Measured horizontal speed

Units

Knots

Speed

0.2

Km/hr

Measured horizontal speed

Units

Kilometers per hour

Checksum

*6E

End of message termination

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