| 摘要 |
A low rate telemetry transmission method for transmission of digital information between a transmission side and a receiving side, comprising: transmitting digital information on a channel at a predetermined bit rate; selecting a pre-determined frame of digital information in the channel; selecting one of at least two digital information elements desired to be transmitted with and in addition to those in the frame; obtaining a key, known at transmission and receiving sides defined by a sequence of digital information which after predetermined processing substantially uniquely identifies the selected digital information element; performing as part of said predetermined processing a first reversible mathematical manipulation of the key and the digital information element to produce a first output; performing a second reversible mathematical manipulation of the first output and the digital information in the frame, to obtain an encoded digital information sequence, and transmitting that encoded sequence; and, receiving and decoding the transmitted encoded sequence by reversing the mathematical manipulation to obtain the frame of digital information in the channel and the key, and identifying the selected element from the key.
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