SYSTEMS FOR THE TRANSMISSION OF CONTROL AND/OR MEASUREMENT INFORMATION

摘要

Apparatus for and method of synchronous transmission of digital control and/or measurement information over a high frequency transmission link with high reliability. A predetermined number of known pseudo-random sequences of selected duration are generated synchronous with a low-frequency sinusoidal subcarrier, each representing one datum of digital information. These sequences are used to phase-reversal modulate the subcarrier which in turn modulates a high-frequency carrier. A receiver demodulates the signal, restoring the original series of pseudo-random sequences. The same pseudo-random sequences as are generated in the transmitter are independently generated in the receiver and are phase-locked and individually compared with each restored sequence. When a correlation is found, the datum of information which corresponds to the transmitted pseudo-random sequence is known. A preferred application is to seismic experimentation.