The length (l) and aspect angle (.theta.) of an underseas target is detered by irradiating the target with a short sonar pulse and processing the echo pulse. Detection circuits operate upon the latter to provide the following target parameters: nearest-point range, R.sub.1 ; farthest-point range, R.sub.2, angle between transducer center line and nearest-range line, .phi..sub.1 ; angle between center line and farthest range line, .phi..sub.2. A computer is then programmed to operate upon these va...

A circuit arrangement for generating in a color picture display device a sawtooth correction current of line frequency flowing through the line deflection coils and having an amplitude varying at field frequency for the purpose of obtaining a better color superposition in the corners of the screen of the display tube. The circuit arrangement is provided with a modulator which includes an electronic switch switching at the line frequency, which connects a field generator to a resonant circuit dur...

Alignment apparatus is disclosed for use in a radar display system in which targets are displayed on a raster scanned cathode ray tube and a computer causes target identities to be displayed adjacent to each target. To align the display system the computer generates a first signal which is applied to the system in the same manner as are radar video signals, and generate a second signal which is applied to the system in the same manner as are target identity signals. The two signals cause two dot...

Ultrasonic directional guidance apparatus for use by divers underwater includes a pair of compact, self-contained units -- a pinger for generating omnidirectional signal bursts, and a unidirectionally sensitive hydrophone for use in locating the pinger. For economy of manufacture, the units ae structurally similar and have substantially identical watertight housings. A significant feature shared by the units is an easily operated switching arrangement for turning the units off and on, or for cha...

Apparatus for the detection of an acoustic image by means of an election tube including a face plate and an electronically scanned transducer made of a thin foil of polymer material whose acoustic wave velocity of propagation is less than 1.8 that of a liquid imaging medium. The face plate also is made of a polymer material having a velocity of propagation less than 1.8 that of said liquid. Preferably, the transducer foil is much thinner than the face plate and has a thickness approximately 0.5 ...

A device for providing a hologram of an object which may be converted to an optical image in real time. The device is part of an acoustical holographic system which uses a source of coherent acoustic radiation to irradiate the object which reflects the acoustic radiation on to a piezoelectric transducer to provide a rapidly varying sinusoidal electronic charge pattern corresponding to the reflected acoustic radiation. Electrons are released from a photocathode, illuminated by a radiation source,...

An installation mechanism for an underwater flexible structure includes a urality of pressure controlled pumps which distend a flexible underwater structure and provide fluid pressure to support such structure in an operative, distended position.

Disclosed is an apparatus and method for determining the presence and position of a moving object within a static field. Basically, the invention utilizes a photocathode in combination with a storage mesh whereby a distributive charge may be stored upon the mesh indicative of light levels within the field. Positive and negative write operations are exercised at different points in time and are superimposed upon the storage mesh. The mesh is then read by means of deflection coils in combination w...

A system for teaching a pet, such as a dog, not to wander beyond a predetermined distance includes a dog whistle triggered by an ultrasonic ranging system. An ultrasonic pulse transmitter worn by the master produces a repetitive signal at a first superaudible frequency which is repeated by an ultrasonic transponder worn by the pet. This second frequency is received at the master. The pulse width is chosen to correspond to the time for sound to travel the predetermined distance in a round trip be...

A technique for making IFF Friend-Accept decisions based upon either receng T.sub.a correct replies in any consecutive sequence of W responses in a larger, predetermined number N of responses, or receiving a consecutive series of a predetermined number R.sub.a of correct replies. A Non-Accept indication is provided upon the occurrence of N interrogations before either T.sub.a correct replies are received in the group of W responses, or a consecutive series of R.sub.a correct replies are received...