Modulestek MG-ST01SP Users Manual

SkyTraq

GPS Module

Key Modules For Your Success

MG-ST01SP

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User’s Manual Ver 1.03

No.208, Jhengkang 1st St., Taoyuan

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Item Date New Release Information In Charge

1

3 2007/10/25 Change SMT PIN to Connector PIN OUT Godspeed

2007/05/02 New released. Harry Lee

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Contents

1. INTRODUCTION……….………………………………………………….…. 4

1.1 O

1.2 M

VERVIEW

AIN FEATURES

…………….……………………………………………… 4

….……………………………………………….…. 4

2. TECHNICAL SPECIFICATIONS……………………………….….….……. 5

2.1 E

2.2 E

2.3 P

LECTRICAL CHARACTERISTICS
VIRONMENTAL CHARACTERISTICS

HYSICAL CHARACTERISTICS

……………………………...…… 5

…………………………………..….. 6

………………………….…… 6

3. MECHANICAL DIMENSIONS……………………………………………… 7

3.1

MG-ST01SP...

..……………..….……..……………...……………..…… 7

4. BOARD CONNECTIONS………………..…………………………………... 8

5. APPLICATIONS……………………………………………….……………… 9

6. SCHEMATICS…………………………………………………………………10

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1. TIntroductionT

1.1. Overview

Modulestek GPS module MG-ST01SP is a high sensitivity, low power consumption;
compact size GPS module designed for a broad spectrum of OEM system applications. The
MG-ST01SP is based on Skytraq’s VENUS521GPS/AGPS baseband processor (with
on-chip Flash memory necessary to store the GPS firmware) and SiGe’s RF receiver IC that
allows easy integration to the target applications.

It supports both an on-board passive antenna and an external active antenna with auto
detection of the external active antenna, when it gets connected. A dedicated
massive-correlator(>>20,000) signal parameter search engine enables rapid search of all
available satellites and acquisition of very weak signals. The MG-ST01SP allows weak
signal tracking and positioning in severe environments such as urban canyons and under
deep foliage.

The MG-ST01SP interfaces to the application system via TTL level serial port with
NMEA protocol. A complete low-cost high-performance MG-ST01SP is an ideal GPS
module, this makes MG-ST01SP easy to be integrated and used in all kinds of navigation
applications or products.

1.2. Main Feature

 Built-in SkyTraq chipset. 44 channels “All-in-View” tracking.
 Cold/Warm/Hot start time: 30/28/1 sec. (average)
 Superior sensitivity: -159 dBm for Superior urban canyon.
 Support A-GPS function.
 Reacquisition time: 0.1 sec.
 Ultra Low power consumption.(40mA)
 Support of SBAS(WAAS / EGNOS) satellites for navigation
 < 4 seconds with AGPS support
 Compact Size, Easy integration into hand-held device.

MG-ST01SP 26.0 x 26.0 x 6.8mm (2mm patch antenna)

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2. TTechnical SpecificationsT

GPS Features Datum

Chipset Skytraq low power chipset WGS-84

Frequency L1, 1575.42MHz

C/A Code 1.023MHz chip rate Dynamic Conditions

Channels Supports 44 channels Altitude <18,000 m (60,000feet)

Antenna Built-in 25x25x2mm patch

antenna

Acceleration <4G

Sensitivity Motional Jerk

To – 159dBm Tracking,

Superior Urban Canyon Performance Interface

GPS Protocol: NMEA-0183 - GGA, GSA, GSV, RMC

Time to First Fix (TTFF) Data bit: 8, stop bit: 1, no parity

Cold Start 30 sec, average Skytraq Binary

Warm Start 28 sec, average Baud Rate: 9600 (Default)

Hot Start 1 sec, average Device Size and Weight

Reacquisition 0.1 sec 26.0x26.0x8.0(mm)

Update rate 1 Hz (std.)

Environmental Characteristics

Accuracy Operating

Velocity <515 m/s (1000 knots)

20m/sec3 max.

(Default)

- 20°C to + 80°C

Position 5m CEP without SA, 10m 2D,

RMS

Velocity 0.1m/sec, without SA

Time 1µs synchronized to GPS time Power

Tracking Current 40mA (Average)

Power Input

All specifications are subject to change without notice

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Temperature

Storage

Temperature

5

- 20°C to + 85°C

3.3V ±5% VDC input

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3. Mechanical Dimensions

3.1. MG-ST01SP

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4.

Board connections

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Figure 2: Board connections and placement diagram.

PIN

Voltage level/

Description

active level
P1 LED LED status
P2 NC
P3 TxD TTL Tx
P4 RxD TTL Rx
P5 NC
P6 NReset Low level force reset
P7 BBat Backup battery supply(1.95~3.6V)
P8 DGND Digital Ground
P9 3.3V 3.3V power supply

P10 1PPS Time pulse signal

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5. TApplicationsT

MG-ST01SP module board receiver is a high performance, ultra low power

consumption, plug &play product. These applications are as follow.

 Car Navigation
 Wrist Watch
 Solar Operated Device
 Marine Navigation
 Fleet Management
 AVL and Location-Based Services
 Radar detector with GPS function
 Hand-Held Device for Personal Positioning and Navigation
 Ideal for PDA, Pocket PC and Other Computing Devices at GPS Application

6. Assisted GPS

With Assisted GPS technology, GPS Data (ephemeris data) will be downloaded from an
A-GPS Server through internet and transferred to the GPS Module via Wire or Wireless like
Bluetooth. This will greatly reduce the TTFF since the positions of the satellites are known.
The downloaded GPS data will expire in 7 days if the GPS is not being used. If GPS
receiver is being used on daily basis, GPS data will also be downloaded from satellites.

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7. Schematics

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Appendix A: GENERAL NMEA FORMAT

The general NMEA format consists of an ASCII string commencing with a ‘$’ character and terminating with a <CR><LF>
sequence. NMEA standard messages commence with ‘GP’ then a 3-letter message identifier.
The message header is followed by a comma delimited list of fields optionally terminated with a checksum consisting of an
asterisk ‘*’ and a 2 digit hex value representing the checksum. There is no comma preceding the checksum field. When
present, the checksum is calculated as a bitwise exclusive of the characters between the ‘$’ and ‘*’. As an ASCII
representation, the number of digits in each number will vary depending on the number and precision, hence the record
length will vary. Certain fields may be omitted if they are not used, in which case the field position is reserved using
commas to ensure correct interpretation of subsequent fields.
The tables below indicate the maximum and minimum widths of the fields to allow for buffer size allocation.

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$GPGGA

This message transfers global positioning system fix data.
The $GPGGA message structure is shown below:

Field Format Min chars

Message ID $GPGGA 6 6 GGA protocol header.

UTC Time hhmmss.sss 2,2,2.3 2,2,2.3 Fix time to 1ms accuracy.
Latitude float 3,2.4 3,2.4 Degrees * 100 + minutes.
N/S Indicator char 1 1 N=north or S=south

Longitude float 3,2.4 3,2.4 Degree * 100 + minutes.
E/W

indicator
Position Fix
Indictor
Satellites Used Int 2 2 Number of satellites used to calculate fix.

HDOP Float 1.1 3.1 Horizontal Dilution of Precision.
MSL Altitude Float 1.1 5.1 Altitude above mean seal level

Char 1 1 E=east or W=west

Int 1 1 0: Fix not available or invalid.

Max chars

Notes

1: GPS SPS mode. Fix available.

Units Char 1 1 M Stands for “meters”.
Geoid

Separation
Units Char 1 1 M Stands for “meters”.
Age of
Differential
Corrections
Diff
Reference
Corrections
Checksum *xx (0) 3 3 2 digits.
Message
terminator

Int (0) 1 4 Separation from Geoids can be blank.

int (0) 1 5 Age in seconds Blank (Null) fields when

DGPS is not used.

int 4 4 0000.

<CR> <LF> 2 2 ASCII 13, ASCII 10.

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$GPGLL

This message transfers Geographic position, Latitude, Longitude, and time.
The $GPGLL message structure is shown below:

Field Format Min chars
Message ID $GPGLL 6 6 GLL protocol header.
Latitude Float 1,2.1 3,2.4 Degree * 100 + minutes.
N/S Indicator Char 1 1 N=north or S=south.
Longitude Float 1,2.1 3,2.4 Degree * 100 + minutes.
E/W indicator Character 1 1 E=east or W=west.
UTC Time hhmmss.sss 1,2,2.1 2,2,2.3 Fix time to 1ms accuracy.
Status Char 1 1 A Data Valid.

Mode Indicator Char 1 1 A Autonomous
Checksum *xx (0) 3 3 2 digits.
Message
terminator

<CR><LF> 2 2 ASCII 13, ASCII 10.

Max chars

Notes

V Data invalid.

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$GPGSA

This message transfers DOP and active satellites information.
The $GPGSA message structure is shown below:

Field Format Min chars

Message ID $GPGSA 6 6 GSA protocol header.
Mode Char 1 1 M Manual, forced to operate in selected

Mode Int 1 1 1 Fix not available.

Satellites Used Int 2 2 SV on channel 1.
Satellites Used Int 2 2 SV on channel 2.

… . .. .. ..

Satellites Used Int 2 2 SV on channel 12.
PDOP Float 1.1 3.1
HDOP Float 1.1 3.1
VDOP Float 1.1 3.1

Max chars

Notes

mode.
An Automatic switching between modes.

2 2D position fix.
3 3D position fix.

Checksum *xx 0 3 2 digits
Message
terminator

<CR> <LF> 2 2 ASCII 13, ASCII 10

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$GPGSV

This message transfers information about satellites in view. The $GPGSV message structure is shown below. Each record
contains the information for up to 4 channels, allowing up to 12 satellites in view. In the final record of the sequence the
unused channel fields are left blank with commas to indicate that a field has been omitted.

Field Format Min chars

Message ID $GPGSV 6 6 GSA protocol header.
Number of
messages
Message number Int 1 1 Sequence number of this message in

Satellites in view Int 1 2 Number of satellites currently in view.
Satellite Id Int 2 2 Satellite vehicle 1.
Elevation Int 1 3 Elevation of satellite in degrees.
Azimuth Int 1 3 Azimuth of satellite in degrees.
SNR Int (0) 1 2 Signal to noise ration in dBHz, null if the sv

Satellite Id Int 2 2 Satellite vehicle 2.
Elevation Int 1 3 Elevation of satellite in degrees.
Azimuth Int 1 3 Azimuth of satellite in degrees.

Int 1 1 Number of messages in the message

Max chars

Notes

sequence from 1 to 3.

current sequence, form 1 to 3.

is not in tracking.

SNR Int (0) 1 2 Signal to noise ration in dBHz, null if the sv

is not in tracking.
Satellite Id Int 2 2 Satellite vehicle 3.
Elevation Int 1 3 Elevation of satellite in degrees.
Azimuth Int 1 3 Azimuth of satellite in degrees.
SNR Int (0) 1 2 Signal to noise ration in dBHz, null if the sv

is not in tracking.
Satellite Id Int 2 2 Satellite vehicle 4.
Elevation Int 1 3 Elevation of satellite in degrees.
Azimuth Int 1 3 Azimuth of satellite in degrees.
SNR Int (0) 1 2 Signal to noise ration in dBHz, null if the sv

is not in tracking.
Checksum *xx (0) 3 3 2 digits.
Message

terminator

<CR> <LF> 2 2 ASCII 13, ASCII 10.

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Speed over ground

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$GPRMC

This message transfers recommended minimum specific GNSS data.
The $GPRMC message format is shown below.

Field Format Min chars

Message ID $GPRMC 6 6 RMC protocol header.
UTC Time hhmmss.sss 1,2,2.1 2,2,2.3 Fix time to 1ms accuracy.
Status char 1 1 A Data Valid.

Latitude Float 1,2.1 3,2.4 Degrees * 100 + minutes.
N/S Indicator Char 1 1 N=north or S=south.
Longitude Float 1,2.1 3,2.4 Degrees * 100 + minutes.
E/W indicator Char 1 1 E=east or W=west.

Float 1,1 5.3 Speed over ground in knots.

Course over
ground
Date ddmmyy 2,2,2 2,2,2 Current date.
Magnetic variation Blank (0) (0) Not used.

Float 1.1 3.2 Course over ground in degrees.

Max chars

Notes

V Data invalid.

E/W indicator Blank (0) (0) Not used.
Mode Char 1 1 A Autonomous
Checksum *xx (0) 3 3 2 digits.
Message

terminator

<CR> <LF> 2 2 ASCII 13, ASCII 10.

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$GPVTG

This message transfers Velocity, course over ground, and ground speed.
The $GPVTG message format is shown below.

Field Format Min chars

Message ID $GPVTG 6 6 VTG protocol header.
Course (true) Float 1.1 3.2 Measured heading in degrees.
Reference Char 1 1 T = true heading.
Course (magnetic) Float 1.1 3.2 Measured heading (blank).

Reference Char 1 1 M = magnetic heading.
Speed Float 1.1 4.2 Speed in knots.
Units Char 1 1 N = knots.
Speed Float 1.1 4.2 Speed
units Char 1 1 K = Km/h.
Mode Char 1 1 A Autonomous
Checksum *xx (0) 3 3 2 digits.
Message

terminator

<CR> <LF> 2 2 ASCII 13, ASCII 10.

Max chars

Notes

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$GPZDA

This message transfers UTC Time and Date. Since the latency of preparing and transferring the message is variable, and
the time does not refer to a particular position fix, the second precision is reduced to 2 decimal places.
The $GPZGA message format is shown below.

Field Format Min chars

Message ID $GPZDA 6 6 ZDA protocol header.
UTC time
UTC day
UTC month
UTC Year
Local zone hours Int (-)2 (-)2 Offset of local time zone (-13) to 13.
Local zone
minutes
Checksum *xx (0) 3 3 2 digits.
Message
terminator

hhmmss

.ss

dd
mm
yyyy

Unsigned 2 2

<CR> <LF> 2 2 ASCII 13, ASCII 10.

2,2,2.2 2,2,2.2 00000000.00 to 235959.99
2 2 01 to 31, day of month.
2 2 01 to 12.
4 4 1989-9999.

Max chars

Notes

© Modulestek 2007

All rights reserved. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The
information presented in this document does not form part of any quotation or contract, is believed to be accurate and
reliable and may be changed without notice. No liability will be accepted by the publisher for any consequence of its use.
Publication thereof does not convey nor imply any license under patent or other industrial or intellectual property rights.

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