[time-nuts] "The GPS navigation is the weakest point,"
Bob Camp
lists at rtty.us
Fri Dec 16 00:30:45 UTC 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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