Abstract: A synthetic aperture sonar (SAS) system utilizes a novel timing and pointing method to illuminate and process data from multiple receive channels over one or more elevation swaths. The system further utilizes cross-track interferometry to improve accuracy of three-dimensional mapping.

Abstract: A synthetic aperture sonar (SAS) system utilizes a novel timing and pointing method to illuminate and process data from multiple receive channels over one or more elevation swaths. The system further utilizes cross-track interferometry to improve accuracy of three-dimensional mapping.

Abstract: A synthetic aperture sonar (SAS) system utilizes a novel timing and pointing method to illuminate and process data from multiple receive channels over one or more elevation swaths. The system further utilizes cross-track interferometry to improve accuracy of three-dimensional mapping.

Abstract: A method and apparatus for detecting a missing phase in a 3-phase twelve-pulse autotransformer rectifier unit (ATRU) which, in use, receives a 3-phase input and delivers a nominal DC output on which a common-mode voltage is impressed. At least one of the frequency and amplitude of the common-mode voltage are monitored thereby to determine whether there is a missing phase in the input. The frequency and/or amplitude of the common-mode voltage may also be monitored thereby to determine whether there is a loss of input voltage.

Abstract: A method and apparatus for detecting a missing phase in a 3-phase twelve-pulse autotransformer rectifier unit (ATRU) which, in use, receives a 3-phase input and delivers a nominal DC output on which a common-mode voltage is impressed. At least one of the frequency and amplitude of the common-mode voltage are monitored thereby to determine whether there is a missing phase in the input. The frequency and/or amplitude of the common-mode voltage may also be monitored thereby to determine whether there is a loss of input voltage.

Abstract: A tracking circuit for tracking an orientation of a motor rotor during a loss of source power to a motor drive includes an electrical energy store for generating a drive signal during periods of source power loss, and a phase locked loop, which is arranged to receive as inputs the drive signal and an induced signal generated during rotor rotation during the periods of source power loss, so that drive signal variations become locked to induced signal variations. The method stores electrical energy in the store during periods of source power supply to the motor drive and generates a drive signal from the electrical energy store during periods of source power loss to the motor drive. The method may vary the drive signal in dependence of an induced signal generated by rotor rotation during a source power loss to the motor drive, to track rotor orientation.

Abstract: A method of manufacturing steel components particularly suited to components such as steering racks having net shape forged gear teeth. The method comprising heating at least a portion of a steel blank to a first temperature of at least 600° C., forging the portion to shape, cooling the portion in a controlled manner to a second temperature above 200° C., then immediately heating at least part of the surface of the portion to an austenising temperature, and then quenching the portion to harden the surface.

Abstract: Apparatus for detecting the presence of electrically-conductive debris in a flow passageway has a bridge circuit with four arms. One arm of the bridge has a coil arranged to monitor the flow passageway. Operating circuitry provides alternating current across one diagonal of the bridge, monitoring circuitry monitors imbalance in the bridge across the other diagonal of the bridge, and balancing circuitry responds to an output of the monitoring circuitry for adjusting the value of at least one component of the bridge circuit in such a way to reduce imbalance in the bridge.

Abstract: A method to collect address trace of instructions executed by a processor has been disclosed. An embodiment of the method includes receiving a software program having a set of instructions and performing instrumentation on the software program to determine addresses of the instructions of the software program in the order in which the instructions are executed by a processor.