Radar system having amplitude and phase modulation and demodulation circuits

A system for amplifying in a single power amplifier, a pulsed signal and a continuous wave signal and for reducing cross-modulation components on said continuous wave signal comprising:

• a source of said continuous signal wave;
• a source of said pulsed signals;
• a modulator circuit coupled to said source of continuous wave signal;
• first means coupled to said source of continuous wave signal and to said source of pulsed signals for combining said continuous wave signal and said pulsed signals;
• a power amplifier coupled to said first means;
• second means coupled to said power amplifier for separating said continuous wave signal and said pulsed signals;
• switching means coupled to said second means and to said source of pulsed signals for being switched to suppress noise between said pulsed signals;
• third means coupled to said switching means and to said second means for combining the signals therefrom;
• and
• a demodulation circuit coupled to said third means and to said modulator circuit for measuring the amplitude and phase modulation of the signal received from said power amplifier and for providing control signals to said modulator circuit for phase and amplitude modulating said continuous wave signal to reduce said cross-modulation components.

A system for amplifying a continuous wave signal and a pulsed signal in a common channel while suppressing cross-modulation components comprising:

• a source of continuous wave signals;
• modulation means coupled to said source of continuous wave signals;
• a source of pulsed signals;
• combining means coupled to said modulating means and to said source of pulsed signals;
• power amplifier means coupled to said combining means;
• and
• demodulating means coupled to said power amplifier means and to said modulating means to receive a portion of the signal energy from said power amplifier means for measuring the phase and amplitude modulation thereon and for providing control signals to said modulating circuit to control said continuous wave signals for suppressing said cross-modulation components.

In a radar system, a subsystem for amplifying a signal in a common channel to be applied to an antenna for transmission and for suppressing cross-modulation components on said signal, comprising:

• a source of continuous wave signals;
• a source of pulsed signals;
• a modulator circuit coupled to said source of continuous wave signals;
• combining means coupled to said modulator circuit and to said source of pulsed signals;
• a power amplifier coupled to said combining means;
• coupler means coupled to said power amplifier and to said antenna;
• and
• a demodulator circuit coupled between said coupler means and said modulator circuit for receiving a portion of the energy from said power amplifier and providing first and second control signals to said modulator circuit, respectively being a function of amplitude and phase modulation and having polarities such that modulation imposed on said continuous wave signals in the modulator circuit is out of phase with cross-modulation components produced within said power amplifier.

In a radar system, a subsystem for amplifying in a common channel a signal to be transmitted through an antenna, said signal including a continuous wave signal and a pulsed signal, said subsystem suppressing cross-modulation components developed in said common channel comprising:

• a source of continuous wave signals;
• modulator means coupled to said source of continuous wave signals;
• a source of pulsed signals;
• combining means coupled to said modulator means and to said source of pulsed signals;
• a power amplifier coupled to receive the output signal from said combining means;
• and
• a demodulation circuit coupled to receive a portion of the energy from said power amplifier and coupled to said modulator circuit for providing thereto control signals as a function of said amplitude and phase modulation for suppressing said cross-modulation components.