Global Sat EM-408 Bedienungsanleitung

環天衛星科技股份有限公司

PRODUCT USER MANUAL

GPS ENGINE BOARD

EM-408

GlobalSat Technology Corporation

台北縣中和市建一路 186 號16 樓(遠東世紀廣場)

16F ,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 (36.4mm * 35.4 mm * 8.3mm) suitable for space-sensitive application

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 DC input

Power consumption 75mA (Continuous mode)

Interface

Dimension 36.4mm * 35.4mm * 8.3mm

Baud rate 4,800 to 57,600 bps adjustable

Electrical level TTL level, Output voltage level: 0V ~ 2.85V

Output message SiRF binary or

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

Environmental

Operating Temp -40℃to +85℃

Dimensions

Pin Assignment

Pin description

* VIN (DC power input):

This is the main DC supply for a 3.3V DC input power module board.

* GPS-TX:

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

* GPS-RX:

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

board from SiRFdemo software or from user written software.

* GND:

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

* Enable/Disable:

On/Off

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

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 Desc

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

Example

Description

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

Example

Units

Description

Messa

e ID

GPRMC RMC

rotocol heade

UTC Time 161229.487 hh

mss.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

Example

Units

Description

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

2.2 NMEA Input Command

A). Set Serial Port ID:100 Set PORTA parameters and protocol

This command message is used to set the protocol(SiRF Binary, NMEA, or

USER1) and/or the communication parameters(baud, data bits, stop bits, parity).

Generally,this command would be used to switch the module back to SiRF Binary

protocol mode where a more extensive command message set is available. For

example,to change navigation parameters. When a valid message is received,the

parameters will be stored in battery backed SRAM and then the receiver will restart

using the saved parameters.

Format:

$PSRF100,<protocol>,<baud>,<DataBits>,<StopBits>,<Parity>*CKSUM

<protocol> 0=SiRF Binary, 1=NMEA, 4=USER1

<baud> 1200, 2400, 4800, 9600, 19200, 38400

<DataBits> 8,7. Note that SiRF protocol is only valid f8

Data bits

<StopBits> 0,1

<Parity> 0=None, 1=Odd, 2=Even

Example 1: Switch to SiRF Binary protocol at 9600,8,N,1

$PSRF100,0,9600,8,1,0*0C<CR><LF>

Example 2: Switch to User1 protocol at 38400,8,N,1

$PSRF100,4,38400,8,1,0*38<CR><LF>

**Checksum Field: The absolute value calculated by exclusive-OR the

8 data bits of each character in the Sentence,between, but

excluding “$” and “*”. The hexadecimal value of the most

significant and least significant 4 bits of the result are convertted

to two ASCII characters (0-9,A-F) for transmission. The most

significant character is transmitted first.

**<CR><LF> : Hex 0D 0A

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