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

gary lists at lazygranch.com
Thu Dec 15 19:14:35 EST 2011


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
>>>>>
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>>>>
>>>>
>>>>
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>
>
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