Re: Assisted GPS UBlox7

[Gary E. Miller]

Yo Mike!

On Fri, 17 Nov 2023 00:08:26 +0000
Mike via <gpsd-users@nongnu.org> wrote:

> On Tue, Nov 14, 2023 at 11:07:28AM -0800, Gary E. Miller wrote:

> 1) You mentioned newer receievers could be had for not much money.
> What should I be looking out for when buying a receiever?  My 7-series
> was cheap and puchased a year ago, so on the face of it, it does
> appaer to meet the criteria of "newer" and "not much money" :-)  I'm
> relutant to ask for recommendations, as it's like asking people to
> take sides in a marital dispute, nevertheless, do you have any
> recommendations / suggestions, please?

Not knowing your use case, I can only throw out a few suggestions:

Here is a NEO-M8N for #13, it does GLONASS and GPS, and works much
better than the M7N:

https://www.ebay.com/itm/183780263635


> 2) I'm curious to why the Ephermeris / Almanac download issue doesn't
> afflict "newer receivers"?

Greg's email explains this.  A modern receiver can get TTFF, from cold
in 29s.  1 s when hot.

> 3) I'm a little perplexed as to why the Ephemeris data is so hard to
> get hold of?

It not.  Getting it in the proprietary form that your u-blox needs
is hard.  Its all about $$$$.


> Surely I can't be the only person in the world with a
> GPS receiever who's pondered sending the Ephemeris over a serial port?

All it takes is money, but very little to gain for that money.

> Surely any schmuck with a SDR can receieve the data from the GPS
> system? I understand that while it's unusual for a GPS, the 7 series
> will actually squirt the Ephermeris from GPS to host, if asked really
> nicely.

Sure, gpsd can give you that Almanac.  Nut it can't convert it to
he undocumente format that u-blox needs.

> The first thought that went through my head was, maybe I
> should buy a 2nd one, leave it on the roof of my house and habe a
> perl script downlod the data every few mins and stick it on a web
> server.  Am I missing something?

Yeah, you need to proprietary program to encode it.

Easier to just buy an M10.

RGDS
GARY
---------------------------------------------------------------------------
Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
        gem@rellim.com  Tel:+1 541 382 8588

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