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I suspect that the first satellite based systems were less accurate
than Cel Nav...
Thety were probably based on measuring directions to a satellite,
(rather than distance, as GPS does).

I also understand that discussing them is out of the stated scope
of this list:-)
However my first question was a Cel Nav question:

When did the accuracy of sattelite nav became better than
the accuracy of Cel nav.
That is when Cel Nav became essentially obsolete.

Alex.

On Tue, 10 Apr 2012, Richard B. Langley wrote:

>
> The first TRANSIT satellite was launched in 1961. The system was
> declared operational in 1964 and became classified. In 1967 it was
> declassified and became available for civilian use.
>
> -- Richard Langley
>
> On 10-Apr-12, at 2:47 PM, Alexandre E Eremenko wrote:
>
>>
>> Fred,
>> I afraid they did not.
>> I am talking of early 60-s. It is to this epoch that
>> the first submarine missiles and unguided Minuteman belong.
>> I doubt that in the early 60-s Americans had a satellite nav
>> comparable to Cel Nav in accuracy.
>>
>> All this can be of course checked on the Internet.
>> The guidance of missiles and Sat Nav systems,
>> when they started to use them.
>>
>> So here is a clearly stated Question to the list:
>>
>> When the first satellite based nav system came into use,
>> which superceded Cel Nav in accuracy ?
>> (I am sure someone has a ready ans).
>>
>> Alex.
>>
>> On Tue, 10 Apr 2012, Fred Hebard wrote:
>>
>>>
>>> The Americans may have had satellite nav then; the Transit series
>>> of satellites.  I believe they had to know where they were.
>>>
>>> On Apr 10, 2012, at 9:49 AM, Alexandre E Eremenko wrote:
>>>
>>>>
>>>> Fred,
>>>>
>>>>> Just as a side note, one reason the Soviets may have
>>>>> been more interested in dip than others is that anomalous dip is
>>>>> more common in the Arctic (and Antarctic).
>>>>
>>>> And I assume you have to know the position of your submarine
>>>> very exactly, to be able to hit your target with an ICBM :-)
>>>> Perhaps this was the reason why Schufeldt report was classified?
>>>>
>>>> Alex.
>>>>
>>>> P.S. I am not sure about early submarine ICBM, but once I visited
>>>> an old Minuteman silo in Wyoming (it is open for the public). I
>>>> was surprised that the missile
>>>> was unguided. It was aimed only at the start by a sophisticated
>>>> aiming
>>>> arrangement, involving a hudge graduated ring... For this you need
>>>> to know your launching position
>>>> very exactly.
>>>>
>>>>
>>>>
>>>>
>>>
>>>
>>>
>>>
>>>
>>> : http://fer3.com/arc/m2.aspx?i=118894
>>>
>>>
>>>
>>
>>
>>
>
> -----------------------------------------------------------------------------
> | Richard B. Langley                            E-mail:
> lang---ca         |
> | Geodetic Research Laboratory                  Web: http://www.unb.ca/GGE/
>  |
> | Dept. of Geodesy and Geomatics Engineering    Phone:    +1 506
> 453-5142   |
> | University of New Brunswick                   Fax:      +1 506
> 453-4943   |
> | Fredericton, N.B., Canada  E3B
> 5A3                                        |
> |        Fredericton?  Where's that?  See: http://
> www.fredericton.ca/       |
> -----------------------------------------------------------------------------
>
>
>
>
>
> : http://fer3.com/arc/m2.aspx?i=118901
>
>
>

   

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