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

Bob Camp lists at rtty.us
Thu Dec 15 19:30:45 EST 2011


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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