Communications: directive radio wave systems and devices (e.g. – Directive – Position indicating
Patent
1988-02-29
1989-12-19
Tarcza, Thomas H.
Communications: directive radio wave systems and devices (e.g.,
Directive
Position indicating
342385, 342454, 342 98, G01S 302
Patent
active
048885959
ABSTRACT:
An encoded information transmitter which transmits a radio frequency carrier that is amplitude modulated by a constant frequency waveform and thereafter amplitude modulated by a predetermined encoded waveform, the constant frequency waveform modulated carrier constituting an acquisition signal and the encoded waveform modulated carrier constituting an information bearing signal, the acquisition signal providing enhanced signal acquisition and interference rejection favoring the information bearing signal. One specific application for this transmitter is as a distress transmitter where a conventional, legislated audio tone modulated signal is transmitted followed first by the acquisition signal and then the information bearing signal, the information bearing signal being encoded with, among other things, vehicle identification data. The acquistion signal enables a receiver to acquire the information bearing signal where the received signal is low and/or where the received signal has a low signal-to-noise ratio in an environment where there are multiple signals in the same frequency band as the information bearing signal.
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"The Nimbus F Random Access Measurement System (RAMS)", by James L. Coates, IEEE Transactions on Geoscience Electronics, vol. GE-13, No. 1, Jan., 1975, pp. 18-27.
Cain David
Manning John R.
Marchant R. Dennis
Sandler Ronald F.
Tarcza Thomas H.
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