Wideband simultaneous transmit and receive (STAR) subsystem

• Main Authors: Yang, Jeffrey M, Hsu, Pei-Lan
• Format: Patent
• Language: English
• Published: 26.02.2019
• Subjects: ANALOGOUS ARRANGEMENTS USING OTHER WAVES; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; JAMMING OF COMMUNICATION; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION ORRERADIATION OF RADIO WAVES; MEASURING; PHYSICS; RADIO DIRECTION-FINDING; RADIO NAVIGATION; SECRET COMMUNICATION; TESTING; TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION

A wideband simultaneous transmit and receive (STAR) subsystem for a radar or other two-way system. The STAR subsystem includes a canceller circuit which digitally prepares a cancellation signal to cancel out leaked or reflected portions of the transmit signal and correlated noise in the receiver signal. The STAR subsystem also performs a final cancellation of temperature-dependent or "thermal" transmit-signal noise in the receiver signal. Together, the combined cancellation techniques prevent receiver saturation and preserve receiver sensitivity. The digital cancellation can be adapted in a closed-loop mode to adjust time delays and amplitudes of cancellation signal components. The cancellation system is run open loop in real time to minimize bandwidth limitations and achieve wideband performance. The STAR subsystem can be implemented with discrete components, as a system-on-chip, or as any combination thereof.