Re: [ipwave] LoRa and LoRaWan

["Sri Gundavelli (sgundave)" <[e-mail]>]

Makes lot of sense. I assume the differential correction support is
already there in the SAE message dictionary (J2735)?

Sri



On 1/28/19, 10:22 PM, "Rex Buddenberg" <[e-mail]> wrote:

>Perhaps the best way to 1) ensure integrity and 2) improve accuracy of
>GPS is to add differential GPS.  Since you have a bunch of roadside
>units anyway, they could have a dGPS functionality easily added to
>them.  This is not a comms issue, it's radionav one.  The Coast Guard's
>dGPS system had a design spec (worst case, 2drms) of 10 meters which is
>the size of the dot on harbor-scale charts for buoy locations.  In
>practice, the system was delivering about an order of magnitude better
>than that.  (GPS itself has improved over its life).
>
>
>On Tue, 2019-01-29 at 00:00 +0000, Sri Gundavelli (sgundave) wrote:
>> If the primary source for location is GPS, and if the vehicle is also
>> equipped with DSRC/LTE radio, I am not sure about the value of
>> bringing
>> one more radio into the equation. I tend to think, using DSRC radio
>> at the
>> RSU for more accurate location prediction (in addition to the GPS
>> feed)
>> might be interesting for this group.
>> 
>> Sri
>> 
>> 
>> 
>> On 1/28/19, 12:54 PM, "STANICA Razvan" <[e-mail]>
>> wrote:
>> 
>> > 
>> > The location is acquired using GPS. It is just collected on the
>> > fleet
>> > management side using LPWAN technologies.
>> > The error when using LPWAN for localisation purposes is close to 1
>> > km
>> > (but many companies are working on reducing this error).
>> > 
>> > Razvan
>> > 
>> > On Mon, 28 Jan 2019 20:09:43 +0000, Sri Gundavelli (sgundave)
>> > wrote:
>> > > 
>> > > Use of LPWAN (LoRaWAN / SIGFIX) for vehicular location for ITS
>> > > applications seems bit extreme to me. From my understanding and
>> > > having
>> > > worked with LoRaWAN, the best accuracy numbers I have seen with
>> > > LoRaWAN is
>> > > in the range 200/~300 meters and that¹s when the RF conditions
>> > > are
>> > > perfect
>> > > (remote areas with the gateways at a certain elevation). Such
>> > > accuracy may
>> > > be OK for general fleet management applications (tracking FedEx
>> > > truck
>> > > etc), but I do not know if that can be used for ITS applications
>> > > such
>> > > as
>> > > for autonomous driving. I would think, the requirement in
>> > > vehicular
>> > > context is more like Wi-Fi indoor location, with accuracy in few
>> > > feet, so
>> > > we can put the vehicle in a lane, but cannot afford to put the
>> > > vehicle in
>> > > the next street.
>> > > 
>> > > 
>> > > Sri
>> > > 
>> > > 
>> > > 
>> > > On 1/28/19, 11:47 AM, "its on behalf of STANICA Razvan"
>> > > <[e-mail] on behalf of [e-mail]>
>> > > wrote:
>> > > 
>> > > > 
>> > > > Hello all,
>> > > > 
>> > > > We have been working with a company in France (now part of the
>> > > > Coyote
>> > > > group) that has been selling a tracker for fleet management
>> > > > purposes
>> > > > for
>> > > > a few years now (the website is in French, sorry:
>> > > > https://traqueur.com/produit/traqueur-nano/) They are using
>> > > > LPWAN
>> > > > technologies (mainly Sigfox, but also LoRa) to collect the
>> > > > location
>> > > > data
>> > > > from the vehicles, with rather good performance. If you have
>> > > > some
>> > > > precise questions, I can try to answer.
>> > > > 
>> > > > Best,
>> > > > 
>> > > > Razvan
>> > > > 
>> > > > On Mon, 28 Jan 2019 09:03:35 -0800, [e-mail] wrote:
>> > > > > 
>> > > > > Hi Alex,
>> > > > > 
>> > > > > This technology is for sure not recommended for security-
>> > > > > related
>> > > > > services (those requiring low delay), but it could be really
>> > > > > useful
>> > > > > for monitoring services, involving on-board sensors, load
>> > > > > management
>> > > > > in logistics, etc.
>> > > > > 
>> > > > > In the papers I provided, we present some initial tests under
>> > > > > mobility conditions. The latency is something you have to
>> > > > > consider
>> > > > > depending on the service you want to implement, but
>> > > > > communication
>> > > > > range and coverage conditions are good points to be
>> > > > > considered.
>> > > > > 
>> > > > > In any case, this is just a technology that could be
>> > > > > complemented
>> > > > > with others in multi-RAT scenarios.
>> > > > > 
>> > > > > Regards,
>> > > > > 
>> > > > > --
>> > > > > José Santa Lozano
>> > > > > Department of Information and Communication Engineering
>> > > > > Faculty of Computer Science
>> > > > > University of Murcia
>> > > > > 30100 Murcia, Spain
>> > > > > Phone: [phone]
>> > > > > Fax: [phone]
>> > > > > Web: http://ants.inf.um.es/~josesanta [5]
>> > > > > 
>> > > > --
>> > > > Razvan Stanica
>> > > > Associate Professor
>> > > > INSA Lyon
>> > > > CITI - INRIA Agora Team
>> > > > http://perso.citi.insa-lyon.fr/rstanica/
>> > > > 
>> > > > _______________________________________________
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