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: [phone](Rep.) Fax: [phone]
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
GND provides the ground for digital pa rt.
BOOTSEL
Set this pin t o high for programming f lash.
RXA
This is t he main receiver channel and is used t o receive so ft ware commands to
the
board from SIRFdemo sof t ware or from user written sof t ware.
PS:
Pull up if not used.
RXB
This is t he auxiliary receiving channel and is used to input di ff erential
corrections
t o the board to enable DGPS navigation.
PS:
Pull up if not used.
TXA
This is the main transmitting channel and is used to output
navigation and measuremen t data to SiRFdemo or user written software.
TXB
For user’s application (not currently used).
RF_IN
This pin receiver signal of GPS analog .due to the RF characteristics of the
signal
the design has to certain criteria. The line on the PCB from the
antenna(or
antenna connector) has to be a controlled microstrip line at 50 Ω
PPS
This pin provides one pulse-per-second output from the board,
which is synchronized to GPS time. This is not available in 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 pin provides one pulse-per-second output from the
board, which is synchronized to GPS time. This is not available in Trickle
Power mode .
GPIO
Functions
Several I/Os are connected to the digital interface connector
for custom applications .
Application Circuit
R46
560R
1 2
C1
1U
1 2
TXA
RXB
RESET
BATTERY
GPIO15
50 ohm microstrip line
GPIO13
RXA
R5
SAW FILTER
1 2
U1 GPS
6
5
4
3
2
1
7
8
9
10
11
12
13
14
15
17
16
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
1.
RB715F
3
1
2
BOOTSEL
TXB
C2
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
p
le Units Descri
p
tio
n
Messa
g
e ID $GPGGA GGA
p
rotocol heade
r
UTC Time 161229.487 hhmmss.sss
Latitude 3723.2475 ddmm.mmmm
N
/S Indicato
r
N
N
=north or S=south
Lon
g
itude 12158.3416 dddmm.mmm
m
E/W Indicato
r
W E=east or W=wes
t
Position Fix Indicato
r
1 See Table B-3
Satellites Use
d
07 Ran
g
e 0 to 12
HDOP 1.0 Horizontal Dilution of Precision
MSLAltitude19.0 meters
Units M meters
Geoid Se
p
aration1meters
Units M meters
A
g
e of Diff. Corr. second
N
ull fields when DGPS is not used
Diff. Ref. Station ID 0000
Checksu
m
*18
<CR><LF> End of messa
g
e termination
SiRF Technology Inc. does not support geoid corrections. Values are WGS84 ellipsoid heights.
Table B-3 Position Fix Indicator
Value Descri
p
tion
0 Fix not available or invali
d
1 GPS SPS Mode, fix vali
d
2 Differential GPS, SPS Mode , fix vali
d
3 GPS PPS Mode, fix vali
d

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
p
le Units Descri
p
tion
Messa
g
e ID $GPGLL GLL
p
rotocol heade
r
Latitude 3723.2475 ddmm.mmmm
N
/S Indicato
r
n
N
=north or S=south
Lon
g
itude 12158.3416 dddmm.mmm
m
E/W Indicato
r
W E=east or W=wes
t
UTC Position 161229.487 hhmmss.sss
Status A A=data valid or V=data not valid
Checksu
m
*2C
<CR><LF> End of messa
g
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
p
le Descri
p
tio
n
Messa
g
e ID $GPGSV GSV
p
rotocol heade
r
N
umber of Messa
g
es12 Ran
g
e 1 to 3
Messa
g
e Numbe
r
11 Ran
g
e 1 to 3
Satellites in View 07
Satellite ID 07 Channel 1
(
Ran
g
e 1 to 32
)
Elevation 79 de
g
rees Channel 1
(
Maximum90
)
Azimuth 048 de
g
rees Channel 1
(
True
,
Ran
g
e 0 to 359
)
SNR
(
C/No
)
42 dBHz Ran
g
e 0 to 99
,
null when not trackin
g
……. …….
Satellite ID 27 Channel 4
(
Ran
g
e 1 to 32
)
Elevation 27 De
g
rees Channel 4
(
Maximum90
)
Azimuth 138 De
g
rees Channel 4
(
True
,
Ran
g
e 0 to 359
)
SNR
(
C/No
)
42 dBHz Ran
g
e 0 to 99
,
null when not trackin
g
Checksu
m
*71
<CR><LF> End of messa
g
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
p
le Units Descri
p
tio
n
Messa
g
e ID $GPRMC RMC
p
rotocol heade
r
UTC Time 161229.487 hhmmss.sss
Status A A=data valid or V=data not valid
Latitude 3723.2475 ddmm.mmmm
N
/S Indicator
N
N
=north or S=south
Lon
g
itude 12158.3416 dddmm.mmm
m
E/W Indicato
r
W E=east or W=wes
t
S
p
eed Over Ground 0.13 knots
Course Over Ground 309.62 de
g
rees True
Date 120598 ddmm
yy
Ma
g
netic Variation2de
g
rees E=east or W=wes
t
Checksu
m
*10
<CR><LF> End of messa
g
e termination
SiRF Technology Inc. does not support magnetic declination. All “course over ground” data are
geodetic WGS48 directions.