Globalstar STINGR Manuale utente
Revision 1.0 STINGR Users Manual
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STINGR Users Manual
Revision 1.0 STINGR Users Manual
09/30/15 Revision 1.0 Subject To Change without Notice P a g e | 2
Table of Contents
1 Introduction .................................................................................................................................................................... 4
1.1 Purpose ................................................................................................................................................................... 4
1.2 Applicable Documents ............................................................................................................................................ 4
1.3 Description.............................................................................................................................................................. 4
2 Application ...................................................................................................................................................................... 5
2.1 Theory of Operation for Globalstar Simplex........................................................................................................... 5
2.2 Block Diagram ......................................................................................................................................................... 8
3 Physical Charactersistics ................................................................................................................................................. 9
4 Reference Design .......................................................................................................................................................... 13
4.1 Schematic.............................................................................................................................................................. 14
4.2 PCB ........................................................................................................................................................................ 15
4.3 BOM ...................................................................................................................................................................... 15
5 Application Programming Interface.............................................................................................................................. 16
5.1 Serial Port.............................................................................................................................................................. 16
5.2 Serial Packet Mode ............................................................................................................................................... 17
5.2.1 Serial Packet Format ..................................................................................................................................... 17
5.2.2 STX3 Legacy Serial Packet Commands .......................................................................................................... 18
5.2.2.1 Send Data (0x00)....................................................................................................................................... 18
5.2.2.2 Query Electronic Serial Number (ESN) (0x01)........................................................................................... 18
5.2.2.3 Abort Transmission (0x03) ........................................................................................................................ 19
5.2.2.4 Query Bursts Remaining (0x04) ................................................................................................................ 19
5.2.2.5 Query Firmware Version (0x05)................................................................................................................ 19
5.2.2.6 Setup (0x06) .............................................................................................................................................. 20
5.2.2.7 Query Setup (0x07) ................................................................................................................................... 20
5.2.2.8 Query Hardware Version (0x09) ............................................................................................................... 21
5.2.3 STINGR Serial Packet Commands.................................................................................................................. 23
5.2.3.1 “Proprietary Track” command .................................................................................................................. 23
5.2.3.2 “Proprietary Motion Activated Track” command..................................................................................... 24
5.2.3.3 “Set Tracking Preferences” command ...................................................................................................... 26
5.2.3.4 “Get Tracking Preferences” command ..................................................................................................... 28
5.2.3.5 “Update Proprietary Track Data” command............................................................................................. 29
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5.2.3.6 “Cancel Proprietary Track/Proprietary Motion Activated Track” command............................................ 30
5.2.3.7 “Send Redundant Burst with GPS” command .......................................................................................... 30
5.2.3.8 “Get Status” command ............................................................................................................................. 33
5.2.3.9 “Query Location” command ..................................................................................................................... 35
5.2.3.10 “Turn On GPS” command...................................................................................................................... 36
5.2.3.11 “Turn OFF GPS” command .................................................................................................................... 37
5.2.3.12 “Turn On GPS Pass-through” command ............................................................................................... 37
5.2.3.13 “Turn Off GPS Pass-through” command ............................................................................................... 38
5.3 STINGR Serial Test Commands.............................................................................................................................. 39
5.3.1 “Transmitter Test” command ....................................................................................................................... 39
5.3.2 “Self Test” command .................................................................................................................................... 40
5.4 Example CRC calculation routines for serial packets ............................................................................................ 41
5.5 24-bit location format........................................................................................................................................... 43
5.5.1 CALCULATING LATITUDE ............................................................................................................................... 43
5.5.2 CALCULATING LONGITUDE............................................................................................................................ 43
6 Test Modes.................................................................................................................................................................... 44
7 REGULATORY APPROVAL .............................................................................................................................................. 46
7.1 Radio Astronomy Site Avoidance.......................................................................................................................... 46
7.2 Regulatory Notices................................................................................................................................................ 46
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1 Introduction
1.1 Purpose
This document describes the physical, electrical, and functional characteristics of the STINGR satellite transmitter
module. The information contained in this document is intended to provide the end user with the necessary
technical information required to use the module in a custom application.
This document is intended to be used by engineers and technical management and assumes a general knowledge of
basic engineering practices by the user.
1.2 Applicable Documents
NMEA 0183 Standard for Interfacing Marine Electronic Devices
1.3 Description
The STINGR is a simplex Satellite transmitter designed to send small packets of user defined data to a network of
low earth orbiting (LEO) satellites using the Globalstar simplex satellite network. The received data is then
forwarded to a user defined network interface that may be in the form of an FTP host or HTTP host where the user
will interpret the data for further processing.
The STINGR contains a satellite transmitter, GPS receiver, motion sensor, and a dual band patch antenna. The
STINGR is a surface mount module designed to attach to a user defined host PCB which must provide power and
communications with a host processor which will control the operation of the STINGR. All electrical connections
are provided via the castellated pads on the perimeter of the PCB.
The STINGR is a small, low-profile device with the dimensions shown below.
Figure 1 (dimensions in inches)
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2 Application
2.1 Theory of Operation for Globalstar Simplex
The STINGR operates on the Globalstar LEO satellite network. LEO (Low Earth Orbit) means that there are a number of
satellites in low earth orbit that constantly orbit the planet and can communicate with Globalstar devices that are within
range of its current position.
Figure 2 LEO Constellation
Since the satellite position is constantly changing, simplex devices on the ground will transmit (with no knowledge of
any of the satellites locations) and the transmission may be received by one or more satellites. These satellites will then
relay the message to the nearest satellite gateway as shown below. Once received by the satellite gateway, the simplex
message will be delivered to the simplex gateway where redundant messages are discarded and the data from the
message is sent to the OEM via the Internet.
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Figure 3 Simplex Messaging
Messages are composed of 1 or more 9-byte payloads. The STINGR can only transmit 9-byte on-air messages, so user
payloads greater than 9 bytes will require multiple on-air packets to be transmitted for each user payload.
There are brief periods of time where there is no satellite in range of the simplex transmitters due to obstructions
and/or satellite coverage geometry. Since a simplex device has no way of knowing if a transmitted message has been
successfully received, the STINGR device is designed to send multiple (redundant) transmissions for each message being
sent over the Globalstar network. The default value for the number of redundant transmissions per message is 3. This
means that each message sent to the STINGR will be transmitted 3 times. Each transmission will contain the exact same
data payload. The redundant transmissions of each message will be sent on a randomized 5-minute nominal interval.
The transmission sequence for a single-packet message using the default setting of 3 redundant transmissions is shown
below.
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The transmission sequence for a two-packet message using the default setting of 3 redundant transmissions is shown
below.
For normal conditions where the transmitter has an open view of the sky, this will result in a better than 99% chance
that the message will be received.
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2.2 Block Diagram
The basic elements of a design utilizing the STINGR simplex transmitter are shown below.
Figure 4
The STINGR provides a single power supply input. Normally, this will be a high-current battery which can provide the
required transmit current during RF transmissions. The STINGR has internal regulators which provide separate power
for the digital, RF and GPS circuitry. This provides the capability to leave the STINGR in a low power consumption state
when the transmitter RF section and the GPS section are idle. The internal RF power supply is a high power supply
which is only required while the STINGR is transmitting a data packet. Internal cirucuitry turns this supply off except
during active transmissions in order to minimize the power consumption of the STINGR. Since the transmission duty
cycle is very low, this supply will be turned off the majority of the time and only active during the transmission of a
packet. VBATT can NOT be disconnected between bursts when sending a multi-packet message. If VBATT is
disconnected, any active modes such as track mode will not be retained.
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3 Physical Charactersistics
Figure 5 Top View
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Figure 6 Recommended PCB footprint layout
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