[time-nuts] "The GPS navigation is the weakest point,"
Bob Camp
lists at rtty.us
Fri Dec 16 00:53:17 UTC 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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