[time-nuts] Story in the Economist about GPS jamming

[Magnus Danielson]

The MEO/GEO distance difference isn't all that great, and comparable 
signal strength is seen from the WAAS/EGNOS (SBAS in general) without 
too much difficulty in design.

Cheers,
Magnus

On 30/07/13 16:51, bg wrote:
> Satnav are not LEO but MEO. Which is good - less sv to cover the earth. Less good because distance is higher compared to LEO regarding signal power at earth.
>
>   --
>
> Björn
>
>
> Skickat från min Mobil
>
> -------- Originalmeddelande --------
> Från: Scott McGrath<scmcgrath at gmail.com>
> Datum: 2013-07-30  14:50  (GMT+01:00)
> Till: jfor at quikus.com,Discussion of precise time and frequency measurement<time-nuts at febo.com>
> Kopia: Discussion of precise time and frequency measurement<time-nuts at febo.com>
> Rubrik: Re: [time-nuts] Story in the Economist about GPS jamming
>
> Any competent engineer could have told the powers that be that a satellite system based in LEO has a relatively high risk profile from the Universe/hostile activity/spoofing and jamming
>
> Yes GPS is/was oversold.
>
> Trouble is Clarkes law applies here (any sufficiently advanced technology is indistinguishable from magic).  And this applies double to the technological illiterates in DC
>
> See Sen 'Tubes' Stevens for the canonical example
>
> Sent from my iPhone
>
> On Jul 29, 2013, at 12:46 PM, "J. Forster"<jfor at quikus.com>  wrote:
>
>> It seems to me that GPS has been oversold as the be all, end all system
>> that made all other systems obsolete and GPS has become all but an
>> indespensible utility.
>>
>> Reports like this, could well be used to promote a backup, like LORAN or
>> eLORAN, just as public buildings have backup generators.
>>
>> YMMV,
>>
>> -John
>>
>> ==================
>>
>>
>>>
>>> http://www.economist.com/news/international/21582288-satellite-positioning-data-are-vitalbut-signal-surprisingly-easy-disrupt-out?fsrc=scn/tw/te/pe/outofsight
>>>
>>>                                  -Bill
>>>
>>>
>>>
>>>
>>>
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