Aeronautics and astronautics – Missile stabilization or trajectory control – Automatic guidance
Patent
1986-05-27
1988-01-19
Jordan, Charles T.
Aeronautics and astronautics
Missile stabilization or trajectory control
Automatic guidance
89 111, F41G 722
Patent
active
047200588
DESCRIPTION:
BRIEF SUMMARY
The invention consists of a method of tracking a motor driven flying object by means of a steerable tracker body.
The defense against airplanes is known to consist of artillery which is shot to the crossing point based on a predicted flight path and considering the flight time of the missile. This method is not effective if the airplane has an irregulara flight path and can therefore not be hit.
If the flight path of the aircraft to be shot is not regular it is preferable to use a steerable flying object, which is constantly directed to the object to be hit. This method fails, however, if i.e. the object to be hit disappears behind a geographical obstacle.
Therefore, both methods fail during low flying attacks. These methods and all other previously known methods can not reveal the location of the takeoff point, i.e. of a carrier from which the aircraft started its irregular flight path. It is desirable to know this location.
The present invention provides a method of tracking a motor driven flying object in which the above mentioned disadvantages are overcome and which permits location of low flying objects as well as take-off locations without visual contact.
This problem can be solved by a method of the above mentioned invention that induces the tracking device into the path of the aircraft and by directing at least part of it depending on certain path criteria so that it or they flies or fly along this path. The path to be followed can be followed from outside with the help of observation.
However, it is also possible to direct the tracking device or parts of it so that it or they flies or fly inside the path to be followed; that is on a direct tracking path.
The method of the invention allows on the one hand to track the flying object and on the other hand it enables to hit the take-off point of the aircraft producing the path by directing the tracking device or parts of it into the opposite direction of the aircraft along its path.
The criteria in the path produced by the motorized flying object are advantageously used in the directly or indirectly heated air and/or other resulting physical changes in the air, especially reduced mobility of ions and/or combustion results.
It is sometimes advantageous if foreign enemy aircrafts can be diffrenciated by the tracking device. An agent is mixed into the exhaust gases of the foreign aircraft's engine and identified by the tracking device. The path criteria are constantly weakened by influence of diffusion, and as the path followed can be twisted in three dimensions, it is advantageous, if at least 3 path sensors are being used, which are at right angles to the flight direction of the tracking device or parts of it and which use the gradient of concentration in the track criterion to direct the tracking device or parts of it by giving flight direction signals.
To prevent the need of additional track sensors it is advantageous if the tracking device or at least part of it at least after being induced into the path of the aircraft continue(s) a screw-like flight path with a prefixed rotation time around the axis of the path and if the flight path of the tracking device or a part of it is being corrected so that the average flight direction of the tracking device or a part of it is at least approximately identical to the axis of the path.
For these purposes it is advantageous for the correction of the flight path of the tracking device or one part of it to determine the intensity of the path criteria and to compare them with the intensity determined by the flight path during one rotation time and to derive thereof a signal for correction of the flight path.
The path criteria can be locally disturbed by atmospheric turbulence and it is therefore advantageous to derive the signal for correction of the flight path from a path unit that consists of several rotation times.
For the secure inducing of the tracking device or at least parts of it into the path of the aircraft it is advantageous to determine an average plane that is defined by the taking-off point of the
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patent: 4170330 (1979-10-01), Hertzberg et al.
patent: 4193688 (1980-03-01), Watkins
patent: 4383663 (1983-05-01), Nichols
GX-Holding AG
Jordan Charles T.
Schellin Eric P.
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