A system for generating a corrected azimuth signal for a radar system hav a radar antenna and a radar display where the radar antenna is mounted on a craft that is subject to motion and that has a stable reference source. A digital computer is connected to the stable reference source of the craft for receiving signals representative of the craft's roll, .phi., and representative of the craft's pitch, .theta.. The digital computer processes the signals representative of roll and pitch utilizing a...

A communication system is disclosed in which a speech path is selectively set up between a master station and mobile units through a plurality of radio channels. The number data of a limited number of priority channels is set in memory devices which are installed respectively in the master station and each mobile unit. In a receive-ready mode, in each station and units, the priority channels are intermittenly subjected to the receive search. In other periods than the receive search periods, no p...

A radar search detection apparatus having a monopulse antenna to receive sum and difference beam signals which are applied to separate target detection channels to detect and identify target returns.

A pulsed-transmission, narrow-band, echo-ranging sonar system has a tow b in which the transmit and receive arrays are mounted so that the field searched forms a toroidal volume.

A battery box includes a rectangular box body to hold a battery, and a rectangular top cover fastened to the box body by fasteners, the box body having curved horizontal flanges vertically spaced at one side and provided with rubber pads for supporting on an oxygen cylinder being carried on the shoulder; the top cover having two long side bottom edges curved outwards and attached to two opposite long sides of the box body at the top, and two short side bottom edges curved inwards and attached to...

The present invention provides a search and rescue radar transponder easy in maintenance and checking. In the search and rescue radar transponder of the invention, the transmission electric power of the transmitting circuit 3 leaked at the changeover switch 7 is inputted to the receiving circuit 2, and whether the search and rescue radar transponder operates normally or not is judged by comparing the leaked electric power level detected by the receiving circuit 2 with a prescribed level at the c...

1. In a self-propelled elongated underwater vehicle having a rudder and dng fins adapted to execute a search pattern about an acoustic marker on the ocean floor and adapted to release an explosive charge carried thereby under the control of a mine sensing device, the combination of right and left bow hydrophones having substantially the same directivity patterns and located symmetrically with respect to the vertical plane defined by the longitudinal axis of said vehicle, an output circuit for ea...

A search tuning type channel detector system for television receivers. When AFC voltage of a tuner has attained a first predetermined voltage level, frequency sweeping direction for tuning is reversed and stopped thereby to tune the tuner at an optimum tuning frequency. Means are provided to allow the inversion as well as stoppage of the frequency sweeping only when AFC voltage has attained a second predetermined voltage level, thereby to exclude possible erroneous operation due to noise or the ...

A search mount for a telescope and a method of operation in which a telescope mount is provided which is indexable about a vertical axis and also about a horizontal axis so as to lay the telescope in any desired direction. The mount is provided with motors, and the movement of the motors is under the control of digital circuitry, and manual switches. The drives between the motors in the telescope mount embody backlash free reduction gearing of novel design and construction. In particular, the mo...

A desired frame image can be searched for and reproduced at high speeds. The same holds true for frame return reproduction. A data unit containing the video information compressed by encoding is stored in a data unit memory and decoded at a decoding unit. When the target frame is decoded, the decode output is stored in an image memory and supplied as a still reproduction image via a switch. The image memory can also be used as a memory for storing the decode output of the frame located at the mi...