L-3 Communications Corporation

L3 Technologies, Inc.

Richard Alan McNamee

Sy Prestwich

Jeffrey B Bench

Gary Raymond Dunn, Jr

Scott M Lyon

A mainlobe detection process can include a number of tests that are performed to define when the monopulse antenna system will transition from open loop scanning to closed loop scanning and then to tracking. A hybrid tracking technique is also provided which adaptively discovers and corrects for phase alignment error. Magnitude-only tracking can be performed initially to locate the nulls in the azimuth and elevation ratios and to identify the magnitudes of these ratios at these nulls. Phase tracking can be then performed. During phase tracking, phase corrections can be repeatedly applied to the azimuth and elevation difference channels to correct any phase error that may exist. During this process, the magnitudes of the ratios can be used to determine how the phase corrections should be adjusted. Once the hybrid tracking process is complete, the monopulse antenna system is properly phase-aligned and phase tracking will be correctly employed.

Adaptive discovery and correction of phase alignment errors in monopulse antenna systems

Systems and method for detecting and removing an arbitrary phase difference between a sum channel signal and a difference channel signal in a monopulse system. A sum channel signal is received from a sum channel signal source and a difference channel signal is received from a difference channel signal source. The difference channel signal is shifted according to various potential arbitrary phase differences &#x3c6;and &#x3c6;+&#x3c0; (where &#x3c6;is from 0 to &#x3c0; radians, i=0, 1, . . . , n; &#x3c6;+&#x3c0; going from &#x3c0; to 2&#x3c0; radians) between the sum and difference channel signals to thereby generate difference channel signals each having a different phase. The difference channels having a different phase are combined with the sum channel signal to generate a plurality of sum+difference signals and sum&#x2212;difference signals. Based on the plurality of sum+difference signals and sum&#x2212;difference signals, maximum in-phase and out-of-phase correlations are determined from the &#x3c6;and &#x3c6;+&#x3c0; pairs. The maximum in-phase and out-of-phase correlation pairs are used in an error estimate calculation.

Monopulse arbitrary phase detection and removal

A system and method for designing a full duplex communications transceiver to enable a reduction in isolation between a transmit signal and a receive signal at a diplexer is disclosed. An RFE transmit filter attenuation level can be determined to be sufficient to attenuate a noise power of the transmitter below a thermal noise floor of the power amplifier. A minimum diplexer transmit filter attenuation level can be calculated to attenuate noise power output from the power amplifier in the receive band to a level below a noise floor of the receiver.

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Salt Lake City, UT, United States of America

Richard Alan McNamee