Jon Elson wrote on 8/25/2017 2:01 PM:
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Martin Eastburn wrote on 8/24/2017 11:12 PM:
If you remember, China was blowing up missiles off the launch pad until
- The then President Clinton gave the Chinese the inertial guidance
system


Please explain how "inertial guidance system" can mitigate "blowing up
missiles off the launch pad".

Common sense dictates that the guidance system inside a missile has
nothing to do with a missile blowing up off the launch pad.

Well, if the guidance system fails catastrophically, it can lead to the
missile breaking up from dynamic forces. If it fails less badly, the range
safety officer will have to blow it up before it hits a populated area.
Most tests have command destruct systems. No idea if they do that in DPRK,
though.

Jon


As I have explained before, all the sensors required to control a rocket
are inside a modern smartphone. Please let me repeat my post:

It is very easy to make a rocket. The difficult part is the flight
control unit that keeps the rocket flying straight and narrow instead of
going in random directions after liftoff and crashing back to earth near
the launchpad.

A modern smartphone has all the sensors required to let the rocket
correct its course and guide itself to its destination.

All you need to do is write an App and send the output to an interface
to control the power of each of the three nozzles (a rocket has no wings
or rudder, so a minimum of three nozzles would be needed to make the
rocket go in any direction you want it to).

North Korea makes smartphones:
http://www.telegraph.co.uk/news/worldnews/asia/northkorea/10238617/Kim-Jong-un-visits-North-Korean-smartphone-factory.html

Download this Android App (Sensors Multitool) to read the sensors:
https://play.google.com/store/apps/details?id=com.wered.sensorsmultitool&hl=en

This "Sensors Multitool" App can read all the sensors in your Android
smartphone (everything you need to guide a missile to its destination):

GPS
Rotation Vector
Linear Acceleration
Gravity
Gyroscope
Accelerometer
Magnetic
Pressure
Orientation