Abstract: In accordance with one form of the present invention, an Adaptively Peaked Super-Regenerative Filter (APSRF) is provided, which preferably includes an interference suppression system (ISS), a summing block, a phase splitter, one or more variable attenuators, three couplers, an amplifier and a filter. The APSRF provides for significant narrowing of the bandwidth and a significant increase in the SNR and Q transfer function of the filter. The output of the amplifier or filter is sampled by one of the couplers and used as a reference sample signal to the ISS. The ISS includes an adaptive loop, which adjusts the reference sample signal in phase and amplitude to form a replica signal. The replica signal is designed to cancel an input sample signal taken from another coupler and applied to the summing block. An output of the summing block provides an error sample signal to the ISS, which enables the ISS to adaptively optimize the nulling function by adjusting the amplitude and phase of the replica signal.

Abstract: Apparatus and method for eliminating an interference signal from a desired signal where a difference of polarization exists or can be made to exist. The desired signal is received on a first antenna of appropriate polarization and the interference signal is received via another port of the same antenna or a second antenna polarized ninety degrees away from the first. The signal received via the other polarization is adjusted for amplitude and phase so that all interference will be cancelled when both signals are subtracted in a summing junction. In the case where the interference and desired signals do not have polarization differences, provision is made to change the polarization of the desired signal.

Abstract: Adaptive apparatus for eliminating interference from a received signal provided on a transmission line caused by radio transceivers includes a plurality of frequency tunable filters tuned to the operating frequency of a corresponding transmitter. The transmitter signal of each transmitter is provided to a corresponding filter. The filter eliminates the non-essential transmission of harmonics, intermodulation and wideband noise of the transmission signal. The adaptive apparatus includes a plurality of cancellation devices wherein each cancellation device receives a sample of each filtered transmission signal and the received signal. The received signal includes an error portion generated by the transmitters and a non-error portion corresponding to the signal received by the antenna. Each cancellation device compares the corresponding sampled transmission signal with the sample of the received signal.

Abstract: A method is provided for obtaining a reference signal for suppressing an interfering signal received by a radio receiver system. The radio receiver system receives the interfering signal on an antenna along with a signal of interest. An electrically conducting structure on which is present an interfering signal corresponding to the interfering signal present on the antenna and close to the antenna is selected and the interfering signal present on the conducting surface is sampled to obtain a reference signal. The reference signal is provided to an interference cancellation system which generates a cancellation signal used to suppress the interfering signal received by the radio receiver system.

Abstract: An interference cancellation system for cancelling interfering signals which is adapted to be connected to a radio receiver system having a receiver antenna, a receiver and a receiver transmission line interconnecting the receiver antenna and the receiver includes an auxiliary antenna, a first directional coupler connected to the auxiliary antenna, a second directional coupler or error coupler connected to the receiver transmission line, a synchronous detector connected to the first and second directional couplers, a vector rotator connected to the outputs of the synchronous detector, a signal controller connected to the vector rotator and a third directional coupler or summer coupler connected to the receiver transmission line and to the signal controller. The vector rotator enables the internal time match of the cancellation system to be optimized by quadrature positioning by varying resistor values in the vector rotator circuit.

Abstract: A radio system and interference cancellation system for use with the radio system include a receiving radio and a transmitting radio which are coupled to a common antenna. A reference coupler provides a reference signal in response to the signal transmitted by the transmitting radio and provides the reference signal to a vector modulator and a synchronous detector. A receiver coupler is responsive to the transmitted signal which is reflected by the antenna and to the signal which is desired to be received and provides a received signal containing an interfering signal component and a desired signal component. An error coupler samples the received signal which includes any residual interfering signal component after cancellation, and provides an error signal to the synchronous detector. The synchronous detector compares the reference signal with the error signal and provides a detector output to the vector modulator.

Abstract: An interference cancellation system employing a polar vector modulator obtains a reference signal and a received signal. The received signal has a desired signal component and an interfering signal component. The reference and received signals as well as an auxiliary signal of known frequency and amplitude, are provided to a signal correlator circuit which compares and correlates the reference and received signals and generates an adjusted auxiliary signal which corresponds to the auxiliary signal adjusted in phase and amplitude. A phase detector detects the difference in phase between the auxiliary signal and the adjusted auxiliary signal and generates a phase control signal in response. Likewise, an amplitude detector measures the amplitude of the adjusted auxiliary signal and generates an amplitude control signal in response. The phase and amplitude control signals and the reference signal are provided to a polar vector modulator having a 360.degree.

Abstract: A method for compensating for time mismatch between an interference signal path and a cancellation signal path in an interference cancellation system involves two cross correlation steps. The first cross correlation establishes a baseline by correlating a reference signal at a synchronous detector of the interference cancellation system with a reference signal through a signal controller and error signal path of the system, which is the signal route from a sample coupler of the interference cancellation system to the synchronous detector by which the residual cancellation signal is measured. When this process is taking place, external signals from the air path are eliminated by using an isolation switch in the receive signal path of a radio receiver system to which the interference cancellation system is coupled. The second correlation is performed between the reference signal at the synchronous detector and the external interference through the error signal path.

Abstract: A low current vector modulator for continuously varying the amplitude and polarity of an RF signal includes first and second hybrid couplers electrically connected at their input ports to an RF source. The characteristic impedance of the hybrid couplers is twice the impedance of the RF source. First and second PIN diodes are electrically coupled to 0.degree. and 90.degree. phase ports of the first hybrid coupler, respectively, and third and fourth PIN diodes are electrically coupled to 0.degree. and 90.degree. phase ports of the second hybrid coupler, respectively. The first and second PIN diodes and the third and fourth PIN diodes also are electrically connected respectively to first and second biasing sources. Varying the biasing provided by the first and second biasing sources varies the amplitude and phase of first and second output signals generated by the first and second hybrid couplers.

Abstract: A connection system particularly suited for blind mate applications wherein a male connector is to be coupled to a female receptacle which cannot be aligned for mating using normal visual alignment and insertion techniques including at least two guide pins secured to either the connector or receptacle and mating sockets each having an axial bore dimensioned for receiving a guide pin secured to the other component. The guide pins and sockets are positioned so that when the guide pins are inserted into the sockets, the connector aligns with the receptacle for simple connection. The guide pins and sockets are secured to the connector and receptacle such that the length and width confines of the connector and receptacle are not increased by the guide pins and sockets. Furthermore, the guide pins provide mechanical support for the connection and the sockets include a flange for spacing the electrical receptacle a predetermined distance above a surface to which the receptacle is mounted.

Abstract: A fast settling, wide dynamic range vector modulator for use in an interference cancellation system or the like includes a quadrature hybrid which receives an RF signal and divides the signal into a primary in-phase component signal and a primary quadrature phase component signal. A first 180.degree. hybrid receives the primary in-phase component signal and provides first and second secondary in-phase component signals which are 180.degree. out of phase with each other. A second 180.degree. hybrid receives the primary quadrature phase component signal and provides first and second secondary quadrature phase component signals which are 180.degree. out of phase with each other. A first switching device selects one of the first and second secondary in-phase component signals, and a second switching device selects one of the first and second secondary quadrature phase component signals.

Abstract: A radio receiver having a narrow effective beamwidth includes a receiver antenna, a receiver and a receiver transmission line interconnecting the two, and an interference cancellation system having an auxiliary antenna, a first directional coupler connected to the auxiliary antenna, a second directional coupler connected to the receiver transmission line, a synchronous detector connected to the first and second directional couplers, a signal controller and a subtractor connected to the signal controller and to the receiver transmission line. The receiver antenna is selected to exhibit an omni-directional antenna pattern, while the auxiliary antenna is selected to exhibit a null in its antenna pattern.

Abstract: An adaptive feed-forward cancelling system obtains a reference signal and a sample signal from an amplifier by directional couplers. The sample signal essentially consists of an undistorted input signal component and a noise and distortion component. The reference and sample signals are provided to an adaptive interference canceller which performs an adaptive cancellation process. The interference canceller provides a cancellation signal essentially consisting of the signal component which is common to both the reference signal and the sample signal. The cancellation signal is injected into a transmission line which carries the sample signal so that only an error signal remains which essentially consists of the noise distortion component of the amplifier output signal. The error signal is then amplitude and phase adjusted to have substantially the same amplitude and to be substantially 180.degree. out of phase with the amplifier output signal.

Abstract: A DC offset compensation circuit for use with a detector of an interference cancellation system or the like includes an RF switch. The interference cancellation system has a reference signal path on which a reference signal representative of an interfering signal is provided to the detector, and an error signal path on which an error signal representative of a received signal of a radio receiver system to which the interference cancellation system is connected is provided to the detector. The RF switch is positioned in the error signal path of the interference cancellation system and is switchable between an open position in which the detector is disconnected from the error signal path, and a closed position in which the detector is connected to the error signal path. A switch controller is coupled to the RF switch, and controls the positioning of the RF switch in the open and closed positions. The detector provides a first DC signal when the RF switch is in the open position.

Abstract: An interference cancellation system for cancelling at least two interfering signals received simultaneously and which is adapted to be connected to a radio receiver system having a receiver antenna, a receiver and a receiver transmission line interconnecting the receiver antenna and the receiver includes an auxiliary antenna, a first directional coupler connected to the auxiliary antenna, a second directional coupler connected to the receiver transmission line, a synchronous detector connected to the first and second directional couplers, a signal controller connected the synchronous detector and a subtractor connected to the receiver transmission line and to the signal controller. The auxiliary antenna has a non-zero phase relationship for the two interferring signals relative to the receiver antenna.

Abstract: An interference cancelling system for cancelling or minimizing multiple signal components of a received signal in a radio receiver caused by an interfering signal from a radio transmitter which interfering signal follows multiple paths to the radio receiver includes a directional coupler which samples the interfering signal transmitted from the radio transmitter and provides a primary sample signal, a transmission link which defines a primary sample signal path from the radio transmitter to the radio receiver, a power splitter for dividing a portion of the primary sample signal path into a plurality of secondary sample signal paths, a power combiner for combining the plurality of secondary sample signal paths back into the primary signal path, and a 180.degree. hybrid coupled to the primary sample signal path and to the radio receiver. The secondary sample signal paths include delay lines and attenuator pads.

Abstract: The present invention is a method and apparatus for separating a plurality of radio frequency signals, comprising N number of signal collectors, each signal collector receiving the plurality of signals from a location different than the other signal collectors, and N being an integer from 2 to infinity; N number of transmission means, each transmission means conducting the signals received from one signal collector; and, N (N-1) number of signal cancellation means, each signal cancellation means having reference, error input and output lines, the reference line coupled to one transmission means and the error and output lines coupled to another transmission means; the signal cancellation means and transmission means being interconnected so that each transmission means is coupled to the output and error lines of N-1 signal cancellation means and the reference line of N-1 other signal cancellation means, and no signal cancellation means having the same transmission means coupled to their output and reference lin

Abstract: Disclosed is a solid state signal controller designed to be inserted in a radio frequency transmission line or path between a source and a signal utilization device to allow the control by external means of signal amplitude ratio and polarity, with a minimum of distortion of the signal. This invention has a dynamic range of more than 100 db and is capable of greater power handling capacity than the prior art signal controllers. It employs a plurality of semiconductor diodes, commonly known as PIN diodes, each cooperating with an energy coupler and having their respective impedances controlled to effect a reflection of energy with either positive or negative polarity toward an output terminal.In one embodiment employing a single channel, a pair of control elements are employed. In the second embodiment, four impedance elements are employed to produce a pair of quadrature signals, each independently controllable in amplitude and polarity.