Abstract: A buoy to shore fish finding system has a buoyant station having a sonar transmitter, a sonar receiver, a sonar to electric signal transducer and a radio transmitter all controlled by a microprocessor. A shore station has a radio receiver and signal display controlled by a shore station microprocessor. The buoyant station microprocessor is programmed to generate sync pulses and to transmit both the sync pulses and tranduced sonar echo returns to the shore station while the shore station microprocessor is programmed to display only echo signals received after a sync pulse.

Abstract: The invention concerns a temporal and spectral submarine locating method, characterised in that it includes equipping the systems or mobile objects to be located and/or identified, with acoustic transmitters transmitting aperiodic signals with a predetermined pseudo-random sequence; deploying, over the working zone where the systems and moving objects to be located are found, one or several measuring points provided, each with an acoustic receiver, with a time scale reference and a measuring point locater; transmitting to a processing centre data derived from the measuring points where, at every time of detection on a given frequency band, precise dating is associated in a time scale referential with a position of the measuring point in a spatial referential; the whole set of data derived from the different measuring points being assembled at the processing centre to be operated on by level 2 correlation with the pseudo-random reference sequences corresponding to each of the searched transmitters.

Abstract: The present invention relates to a multiple beamforming processor formed with an integrated circuit in which a plurality of beams can be formed simultaneously.

Abstract: An inclination angle measurement apparatus includes a first ultrasonic sensor (3) for sending an ultrasonic wave toward a road surface (2), second and third ultrasonic sensors (4 and 5) each for receiving an ultrasonic wave reflected from the road surface (2), and a calculation control circuit (14) for calculating an angle of inclination of a vehicle with respect to the road surface (2) based on a phase difference between ultrasonic waves received by the second and third ultrasonic sensors (4 and 5). Thus the inclination angle measurement apparatus can accurately measure the angle of inclination of the vehicle with respect to the road surface (2).

Abstract: Methods and apparatus compress data, comprising an In-phase (I) component and a Quadrature (Q) component. The compressed data may be saved into a memory or may be transmitted to a remote location for subsequent processing or storage. Statistical characteristics of the data are utilized to convert the data into a form that requires a reduced number of bits in accordance with the statistical characteristics. The data may be further compressed by transforming the data, as with a discrete cosine transform, and by modifying the transformed data in accordance with a quantization conversion table that is selected using a data type associated with the data. Additionally, a degree of redundancy may be removed from the processed data with an encoder. Subsequent processing of the compressed data may decompress the compressed data in order to approximate the original data by reversing the process for compressing the data with corresponding inverse operations.

Abstract: The present invention provides a method and apparatus for enhancing active sonar signal detection by estimating the channel/target response utilizing measured values of the excitation signals and received signals. A Wiener/Volterra series expansion for the excitation and received signals is used as a model, wherein a time invariant environment is assumed, thereby disregarding all random noise contributions. The Wiener/Volterra kernels are then determined in a nonlinear processor using a method of correlations which is designed to produce the kernels utilizing only measured white Gaussian excitation signals and received signals. The kernels can be used to give an optimum correlation between the excitation signals and the received signals.

Abstract: The invention refers to a driving device for hydroacoustic transmitters, including at least one actuating element (1), arranged to execute a reciprocating movement, wherein the movement of the actuating element (1) includes an increase and a decrease of the distance between two ends thereof, and at least one spring member (5, 27) which is connected to the actuating element (1) at said ends and which extends along a curved line between said ends, wherein the increase and the decrease of the distance between said ends result in a change of the curve of the spring member (5, 27) and thereby a movement of it. The device includes an element (12, 13, 28) for displacement of a mass, which displacement element (12, 13, 28) is connected to the spring member (5, 27) so that the movement of the latter is transmitted to the displacement element (12, 13, 28) and generates a displacement thereof, resulting in said mass displacement.

Abstract: An untethered communications buoy system has an untethered buoy freely floating on the surface of water to not compromise the location of the submersible. The submersible has a cavity containing a first data interface member connected to a computer/data-storage that is connected to an acoustic transducer. The untethered buoy has a computer/memory module connected to a radio transceiver and acoustic transceiver. A second data interface member is connected to the computer/memory module and is mounted on the untethered buoy for fitting into the cavity and mating with the first data interface member. A ship is remotely located from the submersible and buoy and has a radio transceiver and an acoustic transceiver. Mating the first and second data interface members permits bidirectional downloading of data between the computer/data-storage and the computer/memory module.

Abstract: Shells fired from the gun of a ship create an underwater explosion that is used to drive a sonar system. Sonobuoys [201] and/or a ship-towed array measure acoustic signals caused by the underwater explosion. A ship processing component [306] analyzes the signals and locates reflections of objects [102] in the signals. In addition to controlling the location at which to fire a shell, an adjustable fuze on the shell may be set to thereby control the depth at which the shell explodes. The low-frequency impulsive nature of the explosion makes it particularly suited for detecting objects in a littoral environment.

Abstract: A method for mapping a maritime zone, in which buoys transmit and receive signals that echo off a target, and are forwarded to a processing base to determine a position and estimate a velocity of a target. The method includes producing a grid for a zone of possible presence; creating blind elliptical zones by deleting direct signals between transmitting and receiving buoys; determining an amplitude and azimuth of a cell; calculating a likelihood index of a cell; calculating a neutral index of a cell; normalizing by the neutral index and performing a base adjustment; multiplying the likelihood indexes for independent observations of buoys; and thresholding of positions to obtain a number of noncontiguous contacts, forming an Active Geographic Plot.

Abstract: An automotive radar test system includes circuitry for multiple down and up conversions of a signal from the automotive radar. Conditioning circuitry delays an intermediate frequency signal (IF2) obtained after a second down conversion to simulate the delay of a return signal from an object located a particular distance from the automotive radar, and to attenuate the IF2 signal to simulate variable target sizes, and to generate a Doppler shift in the IF2 signal to simulate target speed. The conditioned signal is up-converted and transmitted back to the automotive radar system to determine if the automotive radar provides accurate readings for distance, size and speed. The radar test system further couples the second IF signal to a spectrum analyzer to determine if the automotive radar is operating in the desired bandwidth and to a power meter to determine if the automotive radar is transmitting at a desired power level.

Abstract: A system and method for measuring the directional spectrum of one or more waves in a fluid medium using a multi-beam sonar system. In an exemplary embodiment, range cells located within a plurality of acoustic beams are sampled to provide current velocity data. Optionally, wave surface height and pressure data is obtained as well. This velocity, wave height, and pressure data is Fourier-transformed by one or more signal processors within the system, and a surface height spectrum produced. A cross-spectral coefficient matrix at each observed frequency is also generated from this data. A sensitivity vector specifically related to the ADCP's transducer array geometry is used in conjunction with maximum likelihood method (MLM), iterative maximum likelihood method (IMLM), or other similar methods to solve a the wave equation at each frequency and produce a frequency-specific wave directional spectrum.

Abstract: An apparatus for processing passive acoustic signals received on a horizontal line array that were either emitted from an underwater object or echo returned from an object, is proposed to display a radar-like range-bearing image of the object, thereby showing the location of the object relative to the receiver horizontal line array. The range-bearing images can be created at different water depth to search for an underwater object in a three-dimensional space. The method includes receiving an acoustic signal from the target, determining a beam covariance matrix, determining a replica field for a range-bearing of the target, determining a replica beam from the replica field; and processing the beam covariance matrix and the replica beam to determine range-bearing ambiguity surface and estimate depth ambiguity for selected peaks of the ambiguity surface.

Abstract: Device for subsea metrology of distance and relative orientation of a first termination (10) with a local reference system (xr, yr, zr) and which by means of a jumper spool piece (5) is going to be connected to a separate second termination (20) having a local reference system (xB, yB, zB), characterized by a base metrology unit (2) arranged for being carried by an ROV (4), and arranged for aligned arrangement with the second or the first termination's (20, 10) reference system, and comprising the following features: a wire (3) with an extractable first end (31) being arranged for being attached to a receptacle device (7, 7′) arranged on the termination (10, 20) for receiving the wire's (3) first end (31) or a metrology unit and with a wire tensioner device (32) arranged for tensioning the wire (3) between the base metrology unit (2) and the receptacle device (7, 7′); a wire length sensor (34) arranged for measuring the length (DrB) of the extended taut wire (3); a relative azimuth sensi

Abstract: The object of the present invention is to provide an individual authentication method and apparatus that use no bulky apparatuses, are insusceptible to forgery, and use an auditory organ which is almost independent of health condition and aging, is little subject to physiological rejection, and exists in everyone.

Abstract: An acoustic array deployment system and a method are provided. An optical fiber acoustic array has a first end coupled to a projectile housed onboard an underwater vehicle. A second end of the array is coupled to the underwater vehicle. The acoustic array is stored on a spool while the projectile is housed onboard the underwater vehicle. The projectile is launched from onboard the underwater vehicle in a gravitationally downward direction that is not aligned with the underwater vehicle's direction of travel. As a result, the acoustic array is paid out from the spool as the projectile is launched and then sinks. By establishing the line array's broadside beam in a direction that is away from the vehicle and approximately perpendicular to the vehicle's direction of travel, the relative angular difference between the underwater vehicle and target can be used to guide the vehicle towards the target.

Abstract: An underwater acoustic receiver sensor is disclosed that measure up to seven (7) quantities of acoustic field at a collocated point. The quantities measured by the acoustic receiver sensor are acoustic pressure, three orthogonal components of acoustic particle acceleration and three spatial gradients of the acceleration vector. These quantities are appropriately combined and provides for improved directivity of the acoustic receiver sensor.

Abstract: Method and apparatus for determining the positioning of volumetric detection array lines. In the case of a sonar array, ultrasonic frequencies are used. Transmitter subsystems including ceramic transducers, and sensors such as hydrophones, are deployed on the lines of the array and code division multiple access (CDMA) type pseudo-random numbers are used to identify each transmitter. Transit times between transducers and sensors, as determined by detector electronics, are sent to a ship-board receiver in any of various formats, so that array line position can be determined.

Abstract: A fishing system buoy has a watertight bulbous shell housing an electronic load and with a center of mass located within a lower half of the shell. The load includes sonar operatively coupled via a microprocessor with a radio transmitter that has an upright antenna located in an upper half of the shell. The shell has a keel with an eyelet for tethering a fishing line to the shell. The buoy functions both as a fishing bobber and communications relay station for obtaining and transmitting images of fish swimming beneath the bobber.

Abstract: A digital video injection system having a digital image source, means for image processing, a scan converter, a seeker-dynamics interface capable of controlling the image system and a digital system controller that is used to simulate real-time flight to an imaging system, such as an imaging weapons system. A method for injecting digital video and a digital video input product also are disclosed.