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HelicopterMain Discussion › Who saw this coming?
06-22-2017 01:15 AM  3 months agoPost 1
TMoore

rrMaster

Cookeville, TN

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It was just a matter of time. Remember when I said a long time ago that the FAA should have used stop codes and point of sale registration when people bought this crap? Now the Russians and others do what they do best....crack software. Grab some popcorn and beer gents, this is going to get good.

https://motherboard.vice.com/en_us/...utm_source=mbfb

Delayed Response Operator Not Engaged

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06-22-2017 02:21 AM  3 months agoPost 2
Pistol Pete

rrProfessor

Seffner, FL

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If anyone wants to fly over "no fly zones", all they need to do is to NOT buy DJI. Really.

By the way, LITCHI app has been out for some time (years) and already makes such software. Free for Phantom 2 and about $30 for the newer versions.

~~Enjoying the hobby one flight at a time~~

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06-22-2017 03:47 AM  3 months agoPost 3
EEngineer

rrProfessor

TX

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Or have the GPS RX's removed....

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06-22-2017 04:34 AM  3 months agoPost 4
ampex456

rrApprentice

La Verne, CA

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It is unfortunate.

Still no problems, only solutions, governed by MARSHALL AMPLIFICATION. I'm a HIROBO Fan, R U?

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06-22-2017 05:05 AM  3 months agoPost 5
EEngineer

rrProfessor

TX

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The govt. used to use "selective availability" to intentionally degrade public GPS systems for national security reasons.

It's already been designed into the system.

Bill Clinton ordered this SA "turned off" in May, 2000 to make it more "responsive" to civil and commercial GPS users worldwide.

Military systems were not affected by this SA.

When SA is turned on, if one would plot the location of a GPS antenna/RX....the location would "wander" around ~100 meter radius of where the antenna/RX was really located.

In addition, the altitude of the antenna/RX would also "wander" in a similar fashion.

With the flip of a switch, SA could be turned back on, which would "hamstring" drones.....and also other civil/commercial systems.

But, who uses GPS altitude data, as that is unreliable anyway....as the earth is not a perfect sphere and there are mountains, hills, and valleys.

If you're in a car, well....you're only off by ~100 meters....and you can see that far....

A drone, well, it would be thoroughly confused....in 3 dimensions....

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06-22-2017 10:47 PM  3 months agoPost 6
planeguy12

rrNovice

MI, USA

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EEngineer,

May I suggest for your consideration, the use of WAAS enabled GPS navigation avionics. They use a corrected signal encoded in the GPS altitude data to compensate for satellite deviation. The signal is sent from a ground station up to the satellite.

I entrust my life when executing a precision GPS approach with vertical guidance down to minimums in full IMC weather on the reliability of that corrected GPS signal.

How would SA affect the reliability of these signals?

Regards.

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06-22-2017 11:39 PM  3 months agoPost 7
EEngineer

rrProfessor

TX

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"How would SA affect the reliability of these signals?"

As I described....within a 100m radius....

When we were designing beacon tracking devices, one could barely get 4 GPS satellites in "view" for any length of time.

If you can't "see" 4 sats., then no altitude data was available.

The synchronization of time between the receiver and the GPS signal transmitted was crucial for the location "triangulation" to be performed.

The GPS satellites have "cesium" time "clocks onboard...while your GPS receiver can use a more simple(cheaper) crystal oscillator.

The GPS constellation was still being "filled"....

Now they have GPS radio Rx's on a chip....multi-channel so the RX can determine best which GPS sats. to "lock on to.....so one gets the best VDOP and HDOP for max. accuracy without using differential GPS.

It was just a thought....they won't turn SA on because it would hamstring all sorts of things....like your situation.

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06-24-2017 12:05 AM  3 months agoPost 8
Heli_Splatter

rrElite Veteran

USA

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With the commercial use of GPS data together with private use, it would be darn near impossible for the military to degrade or end the signals. Self driving cars running into everything. Even though the ability exists to degrade, the results of doing so prevents it.

The world is a far more dependent society now. How many even carry road maps today? Our enemies realize this and can use this against us. Don't know of a camel made yet needing a sat receiver.

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06-24-2017 12:26 AM  3 months agoPost 9
EEngineer

rrProfessor

TX

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"it would be darn near impossible for the military to degrade or end the signals."

What?

You don't understand the GPS system.

SA can be re-enabled with the "flick of a switch"....It's already been built into the system.

Whether they choose to do it or not is an entirely different matter.

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