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

Bob Camp lists at rtty.us
Thu Dec 15 19:53:17 EST 2011


Hi

Radar bounces off the flat sides very nicely ….

Bob


On Dec 15, 2011, at 7:41 PM, J. Forster wrote:

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