[time-nuts] CGSIC: FW: New NANU 2014090

[Bob Camp]

Hi


> On Dec 16, 2014, at 7:29 PM, Magnus Danielson <magnus at rubidium.dyndns.org> wrote:
> 
> Jim, Bob,
> 
> On 12/17/2014 01:06 AM, Bob Camp wrote:
>> Hi
>> 
>>> On Dec 16, 2014, at 7:01 PM, Jim Lux <jimlux at earthlink.net> wrote:
>>> 
>>> On 12/16/14, 3:36 PM, Magnus Danielson wrote:
>>>> Paul,
>>>> 
>>>> That is indeed the question. Considering that the signal is better
>>>> supported, I hope the light goes on somewhere. The signals is all
>>>> 1,023 Mchips/s, just a thad different. Should be possible to pull off if
>>>> people want to do dual frequency without going full bandwidth.
>>>> 
>>>> Then again, if you are willing to pay good money, you can get it today.
>>>> 
>>> 
>>> what about one of the software receivers? I would think that making  L2 and L5 filters isn't that tough, so all you need is the back end.
>> 
>> ….. and the back end is where all the work is.
> 
> There is a fair amount of work along the full path.
> 
> LNA with some L2 and L5 filters is pretty easy.
> 
> I think you still want to have a correlator baseband processing in say an FPGA.
> 
> There is naturally stuff to be done on the L2C and L5 modulated signals, but it goes in a relatively slow paze so that even modest processors can keep up with it.

Since these are “odd” signals, the hardware is only a small part of the problem. I would bet that the standard bits and pieces are only going to get you part of the way with these signals. The 10% hardware hours / 90% software hours likely applies here. 

Bob


> 
> Cheers,
> Magnus
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