Inhaltsverzeichnis
GPS
… for the masses.
 | Admin | Micha | |
| Location | OR3 | ||
| TinyURL | http://tinyurl.com/navstargps | ||
Add affordable GPS technology to your µC-project with the iTrax02/08 GPS receiver.
Preamble
WIP
Seit einiger Zeit findet man auf eBay GPS receiver im 4er-Pack zu einem unschlagbaren Preis von rund 6,30€ exkl. passende Buchsenleisten für etwa 4,50€ und 3,80€ Versandkosten.
Dabei handelt es sich um iTrax02/08 receiver von Fastrax Oy, die bereits vor einigen Jahren abgekündigt1) wurden und nun in Restbeständen (500+)2) von Babelduck Cybernetics vertrieben werden (Hackerspace-Rabatte möglich).
Diese Seite soll nun jedem Interessierten die Möglichkeit bieten, eigene GPS-Projekte umzusetzen oder bereits bestehende Projekte aufzurüsten (you know, it's like bluetooth; »everything is better with bluetooth« – Sheldon Cooper).
This will include:
- Documentation (e.g. tutorials), TBD
- document collection (e.g. datasheets, application notes etc.), ✓
- Eagle libraries (finished, but yet untested), ✓
- an iTrax02/08 evaluation kit to make development easier, ✓
- sample hardware and code examples. WIP
Current tasks
- Seeking appropriate parts for a basic circuit. WIP
ChangeLog
2012-08-23:
- Update on the Evaluation kit sub-section.
2012-08-19/20:
- Links-section started.
2012-08-14:
- More documents and software added.
2012-08-13:
- Project started,
- iTrax02 specifications, documents and software added.
Document collection
Thanks to Richard Souter.
Evaluation kit
GPS receiver
GPS Workbench
Miscellaneous
Hardware
iTrax02 specifications
| General: | L1 frequency, C/A code (SPS) | |
| 12 independent tracking channels | ||
| Separate search & acquisition engine | ||
| Based on two-chip GPS Solution | ||
| - RF chip, uN8021 | ||
| - Base band chip, uN8031 | ||
| Update rate: | 1 fix/s or user configurable | |
| Accuracy: | Position: | 3m (CEP), 6m 2DRMS |
| Velocity: | 0.2 m/s (50%) | |
| Time: | 20ns RMS (static mode) | |
| Reacquisition: | 100ms typical (signal reacquisition) | |
| TTFF: | Cold Start: | 50 s typical |
| Warm Start: | 35 s | |
| Hot Start: | 8 s | |
| Quick Start: | 3 s | |
| Dynamics: | Acceleration: | 4 G |
| Jerk: | 4 m/s³ | |
| Sensitivity: | -150dBm (tracking) | |
| Operating Voltage: | 2.7V…3.3V (linearly regulated) | |
| Operating Temp: | -40°C…+85°C | |
| Antenna Supply: | Same as board supply or | |
| Separate external supply (e.g. 3.3V) | ||
| Antenna: | External, passive or active | |
| Power Drain: | 130mW @ 2.7V (in continuous mode) | |
| (Active antenna power not included) | ||
| I/O Ports: | Dual Asynchronous data ports | |
| 16-bit GPIO | ||
| SPI-Interface | ||
| Dual Pulse Measurement inputs | ||
| 1PPS Output | ||
| Protocol: | NMEA-0183 V3.0 | |
| Proprietary iTALK binary protocol | ||
| Processor: | Proprietary, 32MIPS integrated 16-bit DSP-core | |
| RISC-like programming under Pre-emptive | ||
| Real Time Operating System Control (VSDSP RTOS) | ||
| Flash Memory: | iTRAX02/8: | 8MBits Flash |
| iTRAX02/4: | 4MBits Flash | |
| Dimensions: | 26 mm × 26 mm × 4.7 mm | |
| (Including RF shield and connector) | ||
| Weight: | 4 g | |
| System Connector: | AMP 4-353515-0 (RF and I/O) | |
| 2 × 20 pin, 0.5 mm pitch | ||
| Mating Connector: | AMP 4-353512-0 | |
Evaluation kit
Note!
Be careful with static electricity!
There are no extra means for protection against static discharge other than the CMOS-output clamping diodes of the baseband IC of iTrax02.
The device and the packaging are specifically labeled:
Please be aware of that; especially when changing jumper settings.
Usage-policy
TBD
Till the policy is written, the device is marked as non-public. Exceptions, upon consultation.
Software
Links
External
- Sehr verständlich geschriebene Artikel von Robert D. Grüller:
Internal
Notes and references
| Legend of Abbreviations | |
| ✓ | Done |
| OTW | On the way |
| TBD | To be done |
| WIP | Work in progress |