Binary psk transmission using two closely related frequencies to eliminate phase discontinuity

Claim 2

A binary communications system for transmitting a signal which is periodically of equal phase and of opposed phase with respect to a reference signal comprising; an information generator means for generating binary information; first signal generator means for generating a relatively narrow-band signal at a first frequency; a second signal generator means for generating a relatively narrow-band signal at a second frequency which differs from said first frequency by an odd multiple of one-half the bit rate of said information generator means; means connected to said first and second signal generator means having four output terminal means for providing phase-opposed signals on said terminal means at said first and second frequencies; signal transmission means; switching means connected between said four output terminal means and said signal transmission means for connecting any one of said four output terminal means to said signal transmission means; and means connected to said information generator means and said switching means for selectively switching the connection of said signal transmission means between two said output terminals having signals of different frequencies and of the same phase such that the signal on said transmission means, in accordance with said binary information, is either in phase or of opposed phase with respect to said signal of said first signal generator means.

Claim 3

The device according to claim 1 and further including frequency divider means connected to said information generator means for generating a signal equal to an odd multiple of one-half said bit rate; and said second signal generator means including a modulator means connected to said frequency divider means and said first signal generator means, and a filter means connected to said modulator means for passing said signal at said second frequency.

Claim 4

The device according to claim 2 and wherein said frequency divider means is a flip-flop.

Claim 5

The device according to claim 3 and wherein said modulator means is a balanced modulator.

Claim 6

A binary communications system for transmitting a signal which is periodically of equal phase and of opposed phase with respect to a reference signal comprising; a clock means for generating a series of clock pulses at a clock rate; an oscillator means for generating a relatively narrow-band signal at a first RF frequency; first phase splitter means connected to the oscillator means for generating a pair of phase-opposed outputs at said first RF frequency; a flip-flop means connected to said clock means for generating a signal at half said clock rate; balanced modulator means connected to said oscillator means and said flip-flop means for modulating said oscillator signal with said flip-flop signal; band-pass filter means connected to said modulator means and tuned to one of the sidebands produced by said modulator means for passing a signal at a second RF frequency; second phase splitter means connected to said filter means for generating a pair of phase-opposed outputs at said second RF frequency; antenna means for transmitting said signals at said first and second RF frequencies; switch means for connecting said antenna means to one of said phase opposed outputs; binary information generator means; and switch control means connected to said binary information generator means and said switching means for selectively switching the connection of said signal transmission means between two said phase-opposed outputs having different frequencies and of the same phase such that the signal on said tranSmission means, in accordance with said binary information, is either in phase or of opposed phase with respect to said signal at said first RF frequency.

Claim 7

A binary communications system for transmitting a signal which is periodically of equal phase and of opposed phase with respect to a reference signal comprising; a clock means for generating a series of clock pulses at a clock rate; an oscillator means for generating a relatively narrow-band signal at a first RF frequency; first phase splitter means connected to the oscillator means for generating a pair of phase-opposed outputs at said first RF frequency; a flip-flop means connected to said clock means for generating a signal at half said clock rate; balanced modulator means connected to said oscillator means and said flip-flop means for modulating said oscillator signal with said flip-flop signal; band-pass filter means connected to said modulator means and tuned to one of the sidebands produced by said modulator means for passing a signal at a second RF frequency; second phase splitter means connected to said filter means for generating a pair of phase-opposed outputs at said second RF frequency; antenna means for transmitting said signals at said first and second RF frequencies; switch means for connecting said antenna means to one of said phase opposed outputs; binary information generator means; and switch control means connected to said binary information generator means and said switching means for selectively switching the connection of said signal transmission means between two said phase-opposed outputs having different frequencies and of the same phase such that the signal on said tranSmission means, in accordance with said binary information, is either in phase or of opposed phase with respect to said signal at said first RF frequency.

Claim 8

The device according to claim 5 and wherein said switch control means includes means connected to said binary information generator means for generating a binary logic signal having a bit rate equal to said clock rate and having one pulse after each transition of said information signal; and logic means connected to said last-mentioned means and said clock means for controlling said switch means.