[time-nuts] "The GPS navigation is the weakest point,"

J. Forster jfor at quikus.com
Thu Dec 15 19:41:41 EST 2011


Maybe you can hear them taking off?

-John

=============


> Hi
>
> Hard to detect looking horizontally, pretty easy looking straight up (or
> straight down from above it).
>
> Bob
>
>
> On Dec 15, 2011, at 7:14 PM, gary wrote:
>
>> Kandahar has proven poor opsec since the thing was photographed! I don't
>> know about the base in Baluchistan.
>>
>> But even knowing the launch doesn't mean they know when it is on target.
>> Supposedly the UAS is stealthy, so it would be hard to detect.
>>
>>
>> On 12/15/2011 4:00 PM, J. Forster wrote:
>>> KISS guys.
>>>
>>> Suppose the Iranians had one of their buddies watching the drone base.
>>> When they saw a drone take off, the guy just called a contact by cell
>>> and
>>> the Iranians turned on a wide coverage jammer somewhere along the
>>> flight
>>> path.
>>>
>>>> From previous incidents and observations, if the drone came into the
>>> jammed area, it'd lose GPS lock, orbit, and run out of gas and crash.
>>> They
>>> could easily select a jammer site that was good for recovery.
>>>
>>> FWIW,
>>>
>>> -John
>>>
>>> ================
>>>
>>>
>>>
>>>> Hi,
>>>>
>>>>> Of course, but then when you switch on your transmitter you are on
>>>>> your
>>>>> own. Considering the speed of a drone (700Km/h?) you need a great
>>>>> coverage, so much RF power out.
>>>>
>>>> Easy: Use a dish antenna on the transmitter.
>>>> Very directional with large ampification.
>>>> If using a 'moderate' opening angle, just pointing the dish at the
>>>> drone
>>>> by hand will work.
>>>> After starting the system locked to the gps time, once the signal is
>>>> on
>>>> the drone,
>>>> I don't think it matters anymore. (It might not even matter at the
>>>> start?)
>>>> The drone will follow the timing of the jammer.
>>>> As the drone will receive all signals from the single transmitter, the
>>>> relative timing will be fixed.
>>>> Just using a OCXO will have a good enough short time stability to
>>>> allow
>>>> the system to work, I would think.
>>>> As the plan is to land or jam the drone within say 10 minutes, long
>>>> term
>>>> stability is not that important...
>>>>
>>>> Greetings,
>>>> Pieter.
>>>>>
>>>>> On Fri, Dec 16, 2011 at 12:22 AM, J. Forster<jfor at quikus.com>  wrote:
>>>>>
>>>>>>
>>>>>>
>>>>>> You could just have a GPS receiver and use that to sync up the
>>>>>> jammer.
>>>>>>
>>>>>> -John
>>>>>>
>>>>>> ==============
>>>>>>
>>>>>>
>>>>>>>
>>>>>>> To transmit a GPS cluster signal you need a GPS simulator to
>>>>>>> generate
>>>>>>> the cluster so even a single transmitter can do this, the relative
>>>>>>> timing and not the different positions of the transmitters is what
>>>>>> the
>>>>>>> receiver sees.
>>>>>>>
>>>>>>> When over-powering the real birds you just needs to be close enough
>>>>>> in
>>>>>>> timing, and it is the location of the target which is of interest.
>>>>>>>
>>>>>>> If this scenario is true... then they have not done their
>>>>>>> home-work.
>>>>>> I
>>>>>>> would ask a number of critical questions already from my civilian
>>>>>>> background.
>>>>>>>
>>>>>>> Cheers,
>>>>>>> Magnus
>>>>>>>
>>>>>>> _______________________________________________
>>>>>>> time-nuts mailing list -- time-nuts at febo.com
>>>>>>> To unsubscribe, go to
>>>>>>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>>>>>>> and follow the instructions there.
>>>>>>>
>>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>> _______________________________________________
>>>>>> time-nuts mailing list -- time-nuts at febo.com
>>>>>> To unsubscribe, go to
>>>>>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>>>>>> and follow the instructions there.
>>>>>>
>>>>> _______________________________________________
>>>>> time-nuts mailing list -- time-nuts at febo.com
>>>>> To unsubscribe, go to
>>>>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>>>>> and follow the instructions there.
>>>>>
>>>>
>>>>
>>>>
>>>> _______________________________________________
>>>> time-nuts mailing list -- time-nuts at febo.com
>>>> To unsubscribe, go to
>>>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>>>> and follow the instructions there.
>>>>
>>>>
>>>
>>>
>>>
>>> _______________________________________________
>>> time-nuts mailing list -- time-nuts at febo.com
>>> To unsubscribe, go to
>>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>>> and follow the instructions there.
>>>
>>
>> _______________________________________________
>> time-nuts mailing list -- time-nuts at febo.com
>> To unsubscribe, go to
>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>> and follow the instructions there.
>
>
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
>
>






More information about the time-nuts mailing list