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| Number | Title | Issue Date |
| 4675775 | Active pilot wire apparatus for electromechanical current differential relays Active pilot wire apparatus for replacing a passive continuous metallic wire pair coupling between the electromechanical units of a conventional electromechanical pilot wire protective relay is disclosed. For the protection of a power line section, an ele... | 06/23/1987 |
| 4675774 | Direct transfer trip apparatus for use with an active pilot wire communications channel Direct transfer trip apparatus for sharing a common active communication channel utilized for signal transfer between at least two electromechanical units which form a current differential protective relay for protecting at least one power line in a power... | 06/23/1987 |
| 4674035 | Supervisory circuit for a programmed processing unit A supervisory circuit for use in an integrated circuit to supervise the program execution of a processing unit is disclosed. The processing unit generates a restart signal at a particular duty cycle under proper program execution conditions and at an unde... | 06/16/1987 |
| 4674002 | Directional comparison blocking system An echo-keyed directional comparison blocking system for protecting an electrical power transmission path in a power system network against internal faults is disclosed. The system includes a terminal unit disposed at each end of the transmission path for... | 06/16/1987 |
| 4663704 | Universal process control device and method for developing a process control loop program A distributed processing unit (DPU) or drop which performs process control and data acquisition functions in a distributed processing control system having a data highway linking a plurality of such units. A DPU functional processor accesses the local pro... | 05/05/1987 |
| 4649389 | Stacked beam radar and target height measurement extractor especially for use therein A radar having a multiplicity of receive beams stacked in elevation and a target height extractor especially for use therein are disclosed. In operation, a set of range sweeps corresponding to an azimuth scan of the stacked receive beams across a detected... | 03/10/1987 |
| 4646098 | Phase coherent decoy radar transmitter A decoy radar transmitter governed by a control signal derived from a main radar transmitter to emit radiation which is phase coherent with the carrier frequency of the main radar transmission is disclosed. A section of the main radar transmitter generate... | 02/24/1987 |
| 4639817 | Protective relay circuit for detecting arcing faults on low-voltage spot networks A protective relay for detecting power arcing faults on a low-voltage spot network. The protective relay can monitor the voltage difference between each phase conductor, the voltage difference between each phase conductor and the neutral conductor, or the... | 01/27/1987 |
| 4635258 | System for detecting a program execution fault A system for detecting a fault in the program execution of a programmed digital signal processing system is disclosed. The fault detection system may include a plurality of monitoring devices for monitoring the execution of a plurality of program portions... | 01/06/1987 |
| 4635157 | Generator protecting relay A protective relay having an operational boundary matched substantially to the output performance limit characteristics of a generator to enhance the protection. The protective relay generates a signal representative of a discriminating impedance based on... | 01/06/1987 |
| 4626853 | Pulse compression radar signal processor A pulse compression signal processor suitable for use in a phase-coded, pulse compression radar for decoding the phase coded radar return pulses to enhance the resolvability of objects in range is disclosed. The pulse compression signal processor includes... | 12/02/1986 |
| 4626831 | Analog signal processing circuit An analog signal processing circuit including both an analog signal multiplexer and a ranging circuit in cascade therewith is adapted for use in an integrated circuit. The multiplexer has a plurality of input current paths and an output current path. It r... | 12/02/1986 |
| 4623949 | Bus differential relay A bus differential relay which is capable of distinguishing between an internal bus fault and an external fault on a feeder line with saturation of the faulted feeder line current transformer during portions of the alternating current cycles thereof is di... | 11/18/1986 |
| 4618864 | Radar channel including an orthogonal MTI filter pair In a radar operating in a moving target indication (MTI) mode with frequency diversity by transmitting N+1 pulse bursts and receiving echo signalling therefrom, a radar channel is included for doppler processing the received N+1 pulse echo signal bursts. ... | 10/21/1986 |
| 4618850 | A/D converter having digitally controlled subranging and self alignment apparatus for use therein A subranging analog-to-digital converter is disclosed having digitally controlled subranging for eliminating switching gain and switching paths in the analog section thereof. The digitally controlled subranging apparatus may be applied to either a single ... | 10/21/1986 |
| 4616229 | System and method of compensating a doppler processor for input unbalance and an unbalance measuring sensor for use therein A system and method of compensating a digital doppler processor for unbalance in in-phase I and quadrature Q signal inputs thereof is disclosed. The method includes the steps of measuring the unbalance in the I and Q signal inputs to the digital doppler p... | 10/07/1986 |
| 4607309 | Apparatus for detecting arcing faults on low-voltage spot networks A protective relay for detecting power arcing faults on a three-phase electrical power spot network. A phase-to-phase power arc on a spot network produces harmonics on the phase-to-phase voltages, and the phase currents; a phase-to-ground arc produces har... | 08/19/1986 |
| 4604674 | Reclosing relay apparatus A reclosing relay for reclosing a circuit breaker in an electrical power system. The reclosing relay is a multi-shot reclosing relay (i.e., providing more than one reclosure command to the circuit breaker) and includes primary and redundant lockout circui... | 08/05/1986 |
| 4603394 | Microprocessor-based extraction turbine control A microprocessor-based controller for an extraction type steam turbine-generator unit capable of selecting from a variety of predetermined control strategies and implementing corresponding valve position control loops by generating appropriate valve posit... | 07/29/1986 |
| 4600961 | Protective relay apparatus for detecting high-impedance ground faults A protective relay for detecting high-impedance ground faults on a three-wire distribution system. The protective relay operates independently of the current in the ground path by using the positive and negative sequence currents to detect a fallen conduc... | 07/15/1986 |
| 4593286 | Method of operating an agile beam coherent radar A method of time scheduling mode dwell times corresponding to a multiplicity of targets, displaced in angle, range and velocity, in the frame time of an agile beam coherent radar without reducing the performance of the radar is disclosed. Targets correspo... | 06/03/1986 |
| 4591940 | Signal quality monitor for protective relay system A signal quality monitor, and a protective relay system using the monitor, which utilizes both AC and DC signals from the receiver agc stage to monitor a plurality of different signal parameters. A signal responsive to the noise in the communication chann... | 05/27/1986 |
| 4589610 | Guided missile subsystem A guided missile subsystem including a Kalmanized radar track loop driven by acceleration signals of the missile generated by an inertial measuring unit (IMU), and a missile control loop driven by estimates of the relative kinematics of the missile and ta... | 05/20/1986 |
| 4586044 | Clutter positioning for electronically agile multi-beam radars An electronically agile multi-beam radar including a clutter positioning system for positioning the band of clutter signals in the derived doppler frequency spectrum of each of the individual beams is disclosed. The radar is operative to switchedly transm... | 04/29/1986 |
| 4578676 | Delay lattice filter for radar doppler processing An adaptive filter for enhancing the discrimination of targets from clutter and noise and suitable for use in a pulse doppler radar signal processor which processes successive echo pulse period signalling in accordance with range cell samples is disclosed... | 03/25/1986 |
| 4577281 | Method and apparatus for controlling the control valve setpoint mode selection for an extraction steam turbine A microprocessor-based controller for an extraction type steam turbine-generator unit capable of selecting from a variety of predetermined control strategies and implementing corresponding valve position control loops by generating appropriate valve posit... | 03/18/1986 |
| 4577279 | Method and apparatus for providing offset compensation An apparatus and method for removing a transient exponential noise signal from a sinusoidal signal. The effects of the transient are removed by sampling the sinusoidal signal, averaging the transient over a time interval corresponding to an integral numbe... | 03/18/1986 |
| 4575814 | Programmable interface memory A digital signal processing system and more especially a programmable bulk memory included therein comprising a plurality of memory sections independently controlled and simultaneously operative for transferring blocks or vectors of digital data words dir... | 03/11/1986 |
| 4573215 | Optical data distribution network with listen-while-talk capabilities An optical data distribution network including a plurality of drops and apparatus for distributing optical data signals to the plurality of drops wherein each drop has listen-while-talk capability is disclosed. Each drop comprises a single length of optic... | 02/25/1986 |
| 4571590 | System for adaptively adjusting radar receiver attenuation A system for adaptively adjusting a radar's receiver attenuation of input signals having a wide dynamic range to maintain the attenuated signals within a predetermined range for radar post processing operations is disclosed. The system includes an automat... | 02/18/1986 |
| 4566053 | Ground-fault protective relay A protective relay for providing an infinitely variable family of curves for use in ground-fault protection. In one embodiment, the protective relay includes a saturable reactor across the output terminals thereof. The saturable reactor impedance varies i... | 01/21/1986 |
| 4555757 | Interface system for hybrid control loops A system for interfacing a digital computer with an analog gimbal control loop rate integrating gyro for controlling the movement of inner and outer gimbaled elements is disclosed. The purpose of the interface system is to permit an increase in the agilit... | 11/26/1985 |
| 4553145 | Method of forming the far-field beam pattern of an antenna A method of forming the far-field beam pattern of an antenna at short ranges is disclosed. More specifically, the antenna beam pattern is rotated through a rotational angle about the line-of-sight of a source of radar signalling located at a near-field ra... | 11/12/1985 |
| 4550380 | Microprocessor-based extraction turbine control A microprocessor-based controller for an extraction type steam turbine-generator unit capable of selecting from a variety of predetermined control strategies and implementing corresponding valve position control loops by generating appropriate valve posit... | 10/29/1985 |
| 4544917 | A/D converter having digitally controlled subranging and self-alignment apparatus for use therein A subranging analog-to-digital converter is disclosed having digitally controlled subranging for eliminating switching gain and switching paths in the analog section thereof. The digitally controlled subranging apparatus may be applied to either a single ... | 10/01/1985 |
| 4521896 | Simultaneous sampling dual transfer channel charge coupled device A dual transport channel charge coupled device for coherently processing two analog signals in a bandwidth compression mode of operation, especially for use in a high resolution coherent radar system, is disclosed. An input charge injection stage is inclu... | 06/04/1985 |
| 4506171 | Latching type comparator An improved latching-type comparator operative in a selected one of two exclusive states is disclosed. In one state, the operational state, a gain stage is rendered operative to amplify at least one intermediate current signal generated by an input stage ... | 03/19/1985 |
| 4502086 | Differential protective relay A differential protective relay for protecting devices on an ac electrical power system. The protected devices can include a transformer, a generator, or a station bus. The differential protective relay evaluates the current flowing into and out of the pr... | 02/26/1985 |
| 4497065 | Target recognition system enhanced by active signature measurements A passive electro-optical target recognition system which utilizes additional signature measurements of an active nature to enhance the discrimination of desired targets from detected candidate targets in the field of view thereof is disclosed. Candidate ... | 01/29/1985 |
| 4484486 | Concentric pulley drive assembly A concentric pulley drive assembly is disclosed as having a central pulley mounted to a motor axle and rotatably driven therewith by a drive motor. A partial pulley in the form of a partial annulus is positioned about a portion of the periphery of the cen... | 11/27/1984 |
