| Re: [chrony-users] Time synchronisation over a high-latency packet radio network |
[ Thread Index |
Date Index
| More chrony.tuxfamily.org/chrony-users Archives
]
- To: chrony-users@xxxxxxxxxxxxxxxxxxxx
- Subject: Re: [chrony-users] Time synchronisation over a high-latency packet radio network
- From: Bryan Christianson <bryan@xxxxxxxxxxxxx>
- Date: Wed, 8 May 2019 11:41:33 +1200
- Dkim-signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=smtpcorp.com; s=a1-4; h=Feedback-ID:X-Smtpcorp-Track:Message-Id:To:Date: Subject:From:Reply-To:Sender:List-Unsubscribe; bh=QBNaP4LGTVxXvx8eKxtWvFwUwgh+XT4BgsxtAikyQPk=; b=0IGdNP/orTZ+WonuPYeBRPbIZ6 fKpe3sVdF+JsQrpzoE4WoExxi4M5UavX3E0l3SQFhBN8nwGXeYvKIUMhshDZCzM49aaVgdAGNxhYE g/UB460qfxT4a2YiVDbHAmsDemzn1S0h8KPY1GWHtOn90cGZ16yc7NrHuaSm4seOM7xHpsyWac1ck hW02hNuMyEWM0B2y1/umwSZylxZW7CcFacdo2ypKdBTQfnLQeFoQ05GmtyTfX+KruKF4NZnFGvgNF ZJRHrlW1/OXrHP8shjcijx8HXRQllewBhJpE+QmIbI0UbZmLMdGYFdLaUKrBDBzK8gsCAqRTGQ9vw roSi6bsg==;
- Feedback-id: 149811m:149811acx33YQ:149811snaDfj8oUA
> On 8/05/2019, at 10:32 AM, Stuart Longland <stuartl@xxxxxxxxxxxxxxxxxx> wrote:
>
> On 8/5/19 4:10 am, Chris Greenman wrote:
>> Is there any possibility of using GPS for time? I had a similar dilemma
>> on my raspberry pi based boat computer. I didn't want to rely on
>> internet provided time since it might not be available if away from the
>> slip.
>
> Well, two reasons we didn't go that route straight up:
> 1. cost (they cost nearly the price of the computer)
> 2. most are UART-based, and we don't have a UART free (UART0 is the
> console, and the PocketBeagle exposes UART2 and UART4).
How about using a USB GPS device.
Navisys have the GR-701W (https://www.globalsources.com/gsol/I/Car-GPS/p/sm/1145283340.htm?WT.pos_kw=prod_PrdtKWSImage_1_0_GR-701W_NonSP&WT.sad_id=1145283340#1145283340) which provides a PPS signal over USB and give you +/- 10usecs precision.
Cost and available power might be a factor for your application though.
--
Bryan Christianson
Bryan Christianson
bryan@xxxxxxxxxxxxx
--
To unsubscribe email chrony-users-request@xxxxxxxxxxxxxxxxxxxx
with "unsubscribe" in the subject.
For help email chrony-users-request@xxxxxxxxxxxxxxxxxxxx
with "help" in the subject.
Trouble? Email listmaster@xxxxxxxxxxxxxxxxxxxx.