초록 ▼

An aircraft has an exhaust flame or plume which can be modulated to communicate. A sound emitter is mounted to the aircraft for emitting acoustic waves into the exhaust plume. An encoder will control the emitter at selected digital sequence to provide a digital message. The flame or plume will radia

An aircraft has an exhaust flame or plume which can be modulated to communicate. A sound emitter is mounted to the aircraft for emitting acoustic waves into the exhaust plume. An encoder will control the emitter at selected digital sequence to provide a digital message. The flame or plume will radiate at a frequency range of interest depending on the type of aircraft. The sound waves cause the frequencies to change from a continuous spectrum to a spectrum which has a much lower amplitude. A detector remotely located from the aircraft will detect radiation. It filters frequencies outside of the frequency range of interest. It will discriminate between the modulated pattern and the continuous pattern. This output provides the digital code that was encoded by the encoder. A decoder will decode the message for the recipient.

대표청구항 ▼

In an aircraft which creates a hot exhaust plume which emits radiation, a communication system comprising: emitter means mounted in association with the aircraft for emitting acoustic waves into the exhaust plume to modulate the radiation of the plume; encoding means for modulating the emitter means

In an aircraft which creates a hot exhaust plume which emits radiation, a communication system comprising: emitter means mounted in association with the aircraft for emitting acoustic waves into the exhaust plume to modulate the radiation of the plume; encoding means for modulating the emitter means in a selected sequence containing a message; detector means remotely located from the aircraft for detecting the radiation created by the exhaust plume, and for creating an electrical output corresponding to the modulated radiation; and decoder means for decoding the output of the detector means to determine the message.