Osmo-lea6t-gps » History » Version 9
laforge, 11/22/2017 09:10 PM
| 1 | 6 | laforge | {{>toc}} |
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| 2 | 1 | laforge | |
| 3 | 6 | laforge | h1. osmo-lea6t-gps |
| 4 | 1 | laforge | |
| 5 | 6 | laforge | |
| 6 | The swiss makes of GPS receiver chips and modules u-blox has (among others), a line of so-called _timing_ GPS modules. |
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| 8 | 2 | laforge | The main difference of such modules compared to the standard modules is their ability to output arbitrary GPS-derived clock |
| 9 | signals anywhere between 0.25 Hz and 10 MHz. |
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| 11 | This allows such modules to be used in a varity of high-precision timing applications where a simpler/traditional approach using |
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| 12 | regular 1PPS outputs is not sufficient. |
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| 13 | |||
| 14 | 1 | laforge | The Osmocom project has developed an evaluation / development board for the u-blox LEA-6T timing module. Like all other |
| 15 | 2 | laforge | Osmocom projects, it is fully open source, i.e. schematics and layout files are freely available. |
| 16 | 1 | laforge | |
| 17 | 8 | laforge | !{width:50%}osmo-lea6t_small.jpg! |
| 18 | 1 | laforge | |
| 19 | 6 | laforge | h2. Electrical Design |
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| 21 | 6 | laforge | |
| 22 | |||
| 23 | h3. Schematics and Layout |
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| 26 | 1 | laforge | The most up-to-date versions of the schematics and layout files can be found in the projects git repository which can be |
| 27 | browsed at http://cgit.osmocom.org/cgit/osmo-lea6t-gps/ or cloned like this: |
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| 28 | 6 | laforge | <pre> |
| 29 | 1 | laforge | $ git clone git://git.osmocom.org/osmo-lea6t-gps |
| 30 | 6 | laforge | </pre> |
| 31 | 1 | laforge | |
| 32 | For your convenience, PDF files are also attached to the bottom of this wiki page. |
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| 33 | 4 | laforge | |
| 34 | 2 | laforge | |
| 35 | 6 | laforge | h3. Major components |
| 36 | 2 | laforge | |
| 37 | 6 | laforge | * LEA-6T Module ("product page":http://www.u-blox.com/en/gps-modules/u-blox-6-timing-module/lea-6t.html, "data sheet":http://www.u-blox.com/images/downloads/Product_Docs/LEA-6_DataSheet_%28GPS.G6-HW-09004%29.pdf) |
| 38 | * FIXME: add more components here |
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| 41 | h2. How to use |
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| 43 | |||
| 44 | 1 | laforge | You can connect to it using one of the Osmocom-style serial cables (3.3V UART on 2.5mm audio jack) or using USB. You will get |
| 45 | a serial port that can speak either NMEA or the proprietary UBX protocol. |
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| 47 | 6 | laforge | The full protocol is specified in the "u-blox 6 protocol specifiation":http://www.u-blox.com/images/downloads/Product_Docs/u-blox6_ReceiverDescriptionProtocolSpec_%28GPS.G6-SW-10018%29.pdf. |
| 48 | 2 | laforge | |
| 49 | 6 | laforge | h2. Where to buy |
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| 52 | 2 | laforge | You can have the PCB etched anywhere you'd like, using the layout data we have provided. Most of the components |
| 53 | 1 | laforge | are available via distributors like Digikey. Only the LEA-6T module has to be obtained through an u-blox distributor. |
| 54 | 2 | laforge | |
| 55 | 9 | laforge | "sysmocom":http://sysmocom.de/ *used to be selling* fully assembled boards "in their webshop":http://shop.sysmocom.de/ *but this service is discontinued!* |
| 56 | 1 | laforge | |
| 57 | 6 | laforge | h2. Who |
| 58 | |||
| 59 | 4 | laforge | |
| 60 | 9 | laforge | osmo-lea6t-gps was designed by Sylvain Munaut. Prototype manufacturing and testing was performed by Harald Welte of sysmocom. |
