my experiments with an arbitrary GPS module offering a PPS discipline
showed that it is easily archievable to create a local clock (ntpd
based) with a clock precision of 1 microsecond even with cheap low-power
soc computers: I was using a Raspberry Pi.
The most interesting finding was the clock d
dio ?
>
>
> -Original Message-
> From: Sylvain Munaut [mailto:246...@gmail.com]
> Sent: Thursday, 17 August 2017 1:20 AM
> To: b.shube...@sirinsoftware.com
> Cc: vk4...@tech-software.net; GNURadio Discussion List
>
> Subject: Re: [Discuss-gnuradio] Time syncing between
10 ms timing certainty is actually pretty hard to achieve across USB2!
But: as far as I can see, it'd be rather easy to say, tune both sticks
to DVB-T, cross-correlate to find the relative offset, tune to the
frequency of interest and work from there. That is, if the delay spread
in the cellular ch
In my experience "rf inserting" 1pps into early receiver (sampler) stages,
maybe "coding" timing with 1pps && 10Hz, all derived from gps reference.
This "affect" the signal under analysis but that can be do only
periodically... for multilateration ;-)
Victor
Il 16 ago 2017 19:45, ha scritto:
>
No.
On Thu, 2017-08-17 at 01:52 +1000, vk4...@tech-software.net wrote:
> Are you trying to do MultiLateration using software defined radio ?
>
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Say we need +-10ms accuracy in timestamps. Precision Time Protocol in LAN
should sync PC's clocks with enough accuracy.
And then using USRP-like methods - set current/start time - get first sample in
known time? Of course USB will add
undetermined delays but no external GPS required.
On Wed, 20
I have time-synchronized RTLSDRs using a known, pseudo-random, sequence
injected into the RX inputs using directional couplers. These all had
a common clock so they wouldn't drift apart.
On 2017-08-16 11:57, Derek Kozel wrote:
> It should be pointed out that the hardware based timestamping is
It should be pointed out that the hardware based timestamping is only
needed if you need time alignment better than a half second or so. With USB
transfers, various buffers, NTP based alignment of the host computer's
time, and some extra code on the host side you could do a coarse time
alignment, p
-gnuradio] Time syncing between SDRs on different computers
On Wed, Aug 16, 2017 at 5:11 PM, wrote:
> What type of hardware? I thought from hardware point of view only
> precise clock is required and all the other things in firmware. I've naively
> thought i could modify hackrf f
On Wed, Aug 16, 2017 at 5:11 PM, wrote:
> What type of hardware? I thought from hardware point of view only precise
> clock is required and all the other things in
> firmware. I've naively thought i could modify hackrf firmware to get this
> feature.
Mostly a FPGA and a PPS input from a GPS re
What type of hardware? I thought from hardware point of view only precise clock
is required and all the other things in
firmware. I've naively thought i could modify hackrf firmware to get this
feature.
On Wed, 2017-08-16 at 17:04 +0200, Sylvain Munaut wrote:
> The USRP have dedicated hardware t
$30 vs $300 $3000
-Original Message-
From: Sylvain Munaut [mailto:246...@gmail.com]
Sent: Thursday, 17 August 2017 1:04 AM
To: b.shube...@sirinsoftware.com
Cc: vk4...@tech-software.net; GNURadio Discussion List
Subject: Re: [Discuss-gnuradio] Time syncing between SDRs on different
The USRP have dedicated hardware to support that kind of stuff, the
rtl-sdr and hackrf do not.
That's the kind of advanced features that are cut to reduce the price ...
Cheers,
Sylvain
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> A
>
> -Original Message-
> From: Discuss-gnuradio
> [mailto:discuss-gnuradio-bounces+vk4tec=tech-software@gnu.org] On Behalf
> Of b.shube...@sirinsoftware.com
> Sent: Wednesday, 16 August 2017 11:22 PM
> To: discuss-gnuradio@gnu.org
> Subject: [Discuss-gnuradio
PM
To: discuss-gnuradio@gnu.org
Subject: [Discuss-gnuradio] Time syncing between SDRs on different computers
Hi,
Reading through archive I've found a thread describing how to sync time
between two USRPs on different computers using set_time_now and
set_start_time methods. Unfortunately I hav
Hi,
Reading through archive I've found a thread describing how to sync time between
two USRPs on different computers using
set_time_now and set_start_time methods. Unfortunately I have only RTL-SDR now
(and will have HackRF in a few weeks). As
far as I can see there are no such methods in RTL-SD
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