Method and system for pulse interval modulation

Details Method and system for pulse interval modulation Method and system for pulse interval modulation

1972-07-24

1991-06-25

Buczinski, Stephen C.

Optics: measuring and testing

Optical pyrometers

Plural color responsive

342 13, 342 16, 342189, 356152, 375 23, 455604, 455606, 455611, 36472803, G01C 308, G01S 736, H03K 704, G06F 15336

Patent

active

050261568

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 this laser environment, the invention 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. Thus, a number of laser designators may be operated selectively with predetermined seekers in the same area.

REFERENCES:
patent: 2698896 (1955-01-01), Rinia
patent: 3588898 (1971-06-01), Watters, Jr. et al.
patent: 3614626 (1971-10-01), Dillard
patent: 3696248 (1972-10-01), Cunningham et al.
patent: 3702476 (1972-11-01), Nathanson et al.

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