Modulation of polarization orientation and concurrent conventional modulation of the same radiated carrier

Claim 2

A transmitter for modulating the orientation angle of linear polarization of a carrier in accordance with a signal comprising: means for generating two sinusoids of identical frequency, equal amplitude and 90* out of phase, at two outputs respectively, a pair of sampling gates connected to the outputs of said sinusoid generating means, means for transmitting gating voltage pulses to both sampling gates at a pulse repetition frequency having a center frequency equal to the frequency of said sinusoids, said pulse transmitting means having a signal input terminal and being operable in response to a time-varying signal input to frequency modulate the pulse repetition frequency of the gating pulses according to the time-varying signal, a pair of box car generator means connected to the outputs of the respective sampling gates, a pair of low pass filter means connected to the outputs of the box car generator means, a source of said carrier, a pair of multiplier means connected to the outputs of the low pass filter means, means for coupling the output of said carrier source to said pair of multiplier means, and a pair of crossed dipoles connected to the outputs of said multiplier means.

Claim 3

A transmitter as defined in claim 1 wherein said carrier source includes an input for signals, said carrier source being operable to frequency modulate the carrier in accordance with input signals.

Claim 4

A radio communication system comprising transmitting means that includes means for generating two sinusoids of identical frequency, equal amplitude, and 90* out of phase, at two outputs respectively, a pair of sampling gates connected to the outputs of said sinusoid generating means, means for providing gating voltage pulses to both sampling gates at a pulse repetition frequency having a center frequency equal to the frequency of said sinusoids, said means having a signal input terminal and being operable in response to a time-varying signal input to frequency modulate the pulse repetition frequency of the gating pulses according to the time-varying signal, box car generator means connected to the outputs of the respective sampling gates, low pass filter means connected to the outputs of each of the box car generator means, a source of said carrier, a pair of multiplier means connected to the outputs of the low pass filter means, means for coupling the output of said carrier source to said pair of multiplier means, a pair of crossed dipoles connected to the outputs of said multiplier means to radiate radio frequency energy with varying angular orientation of linear polarization in a predetermined relationship with the input signal; and a receiver means for the radio frequency energy and operable for detecting the signal.

Claim 5

A radio communication system comprising transmitting means that includes means for generating two sinusoids of identical frequency, equal amplitude, and 90* out of phase, at two outputs respectively, a pair of sampling gates connected to the outputs of said sinusoid generating means, means for providing gating voltage pulses to both sampling gates at a pulse repetition frequency having a center frequency equal to the frequency of said sinusoids, said means having a signal input terminal and being operable in response to a time-varying signal input to frequency modulate the pulse repetition frequency of the gating pulses according to the time-varying signal, box car generator means connected to the outputs of the respective sampling gates, low pass filter means connected to the outputs of each of the box car generator means, a source of said carrier, a pair of multiplier means connected to the outputs of the low pass filter means, means for coupling the output of said carrier source to said pair of multiplier means, a pair of crossed dipoles connected to the outputs of said multiplier means to radiate radio frequency energy with varying angular orientation of linear polarization in a predetermined relationship with the input signal; and a receiver means for the radio frequency energy and operable for detecting the signal.

Claim 6

A communication system as defined in claim 3 wherein said receiver means includes a second pair of crossed dipoles, a second means having two outputs for providing two sinusoids of identical frequency, lower than that of said carrier, equal amplitude, and ninety degrees out of phase, at its respective outputs, a second pair of multipliers coupled to said second pair of crossed dipoles and to the outputs of said second means, means for summing the outputs of said second paiR of multipliers, and means coupled to the output of said summing means for separating out said signal.

Claim 7

A communication system as defined in claim 4 wherein said transmitter carrier source includes a signal terminal, and said source being operable to FM-modulate the carrier with the signal input at its signal terminal, and wherein said means coupled to the output of said summing means in said receiver operates to separate out each of the signals.