PULSE CODE RECOGNITION METHOD AND SYSTEM

Abstract

A system and method for pulse interval modulating signals in accordance with a code wherein the code resides in the spacing between adjacent pulses. The invention has particular utility in connection with laser designators and laser seekers and, while clearly not limited to this application, is disclosed hereinafter mainly in connection with laser designators and seekers. In connection with the laser environment, the system may include a pulse interval modulation encoder for encoding the laser designator output signal and a pulse interval modulation decoder for decoding by the laser seeker of the encoded designator signal. The encoder preferably employs an ordered arrangement of unique pulse interval pairs which cyclically repeats after a relatively long time period. Because of the length of the time period and the apparent randomness of the intervals forming the unique interval pairs, the code appears to enemy countermeasures to be random. The decoder is, however, capable of recognizing the code from a particular designator by locally generating the same ordered set of unique interval pairs for comparison with the incoming designator signal through the use of a digital code correlator having a unique arrangement of shift registers and logic gates. Thus, a number of laser designators may be operated selectively with predetermined seekers in the same area.

Source: Google Patents

35 USC §181 Secrecy Order

Inventor

• 1THOMAS E. BAYSTON

Sensitive facility: Bethesda MD (defense contractors)

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