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| Number | Title | Issue Date |
| 8068385 | System and method for enhancing weak target signals for a sensor array A system and a corresponding method used with a sensor array selects candidate weak target signals from within one or more received signals and enhances those candidate weak target signals relative to a noise background. ... | 11/29/2011 |
| 7907475 | Obstacle detecting system for vehicle An obstacle detecting system for a vehicle detects an obstacle by transmitting a transmitting wave and receiving a receiving wave, which is a reflection of the transmitting wave by the obstacle. The system calculates a distance to the obstacle. The system varies dir... | 03/15/2011 |
| 7337083 | Process for identification of the direction of rotation of two periodic electrical signals at the same frequency A process and apparatus for identification of the direction of rotation of two periodic electrical signals present on two electrical conductors, particularly of a three-phase power system. In this process, the signals are sampled from two conductors by two wires of ... | 02/26/2008 |
| 7325328 | Methods and apparatus to determine vessel draft and amount of cargo loaded in a vessel The present invention discloses the methods and apparatus to acquire, record, and analyze data to determine the draft of a water-borne vessel and/or the amount of cargo that has been loaded in a water-borne vessel. The apparatus includes a portable, handheld housing... | 02/05/2008 |
| 7176789 | Method for measuring distance and measuring device for it A method for distance measuring using at least two contact-less distance sensors, e.g., ultrasound sensors, is provided, which distance sensors each have one emitter for emitting measuring pulses (MI) and one receptor for receiving measuring pulse echos (ME). The di... | 02/13/2007 |
| 7117739 | Fluid-gauging probes An ultrasonic fluid-gauging probe has a still well and two or more piezoelectric transducer elements mounted at its lower end. A drive and processor unit may separately energize each element and provide a separate output indicative of fluid height so as to provide r... | 10/10/2006 |
| 7027480 | Laser level A laser level disposable on a reference surface includes a housing, a laser diode disposed within the housing for emitting a laser beam along a path, a lens disposed in the path for converting the laser beam into a planar beam. The planar beam thus forms a line on t... | 04/11/2006 |
| 7019683 | Shipping container security system A security system senses intrusions into a shipping container through the opening of doors, cutting an opening, or removing the doors from their hinges. Intrusion information is transmitted to a remote receiver without interrogation, thereby reducing power consumpti... | 03/28/2006 |
| 7004031 | Ultrasonic sensor An ultrasonic sensor includes a piezoelectric vibrator, a reverberation measuring device and a compensating device. The piezoelectric vibrator vibrates to transmit an ultrasonic wave, receives a reflected wave of the transmitted ultrasonic wave and produces an outpu... | 02/28/2006 |
| 7002510 | Method and apparatus for air-to-air aircraft ranging A method and apparatus is disclosed for determining the range between two planes, ownship (10) and target (12). Model data (66) estimating the velocity and position of target (12) is compared to actual flight path data of the target (1... | 02/21/2006 |
| 6909397 | Stabilizing motion in a radar detection system using ultrasonic radar range information One preferred embodiment of the present invention provides a system and method for suppressing motion artifacts introduced by movement of a radar detection system. Briefly described, in architecture, one embodiment of the system, among others, can be implemented as ... | 06/21/2005 |
| 6850186 | System for determining position and velocity of targets from signals scattered by the targets The present invention relates to a system for using signals scattered by targets to determine position and velocity for each of the targets and comprises a set of transmitters and receivers of electromagnetic or acoustic signals, said transmitters and receivers disp... | 02/01/2005 |
| 6801474 | Resampling sonar echo time series primarily for seabed sediment classification This invention describes a method and system for classifying a survey area according to an attribute of the seabed. More particularly, the classification technique uses echoes recorded from sonar pings transmitted towards the seabed. The echoes are resampled at a sa... | 10/05/2004 |
| 6778467 | Underwater sounding apparatus A mixer shifts the center frequency of a received signal to a baseband according to a center frequency detected by a center frequency detector or a center frequency estimated from ship speed, for example, by a center frequency estimator. The passband of a variable p... | 08/17/2004 |
| 6711094 | Method and apparatus for active sonar detection enhancement 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 excitatio... | 03/23/2004 |
| 6549873 | Position detecting device for hydraulic cylinder, and detecting method thereof A pressure sensor is set in a conduit connected to a cylinder tube, and a temperature sensor is disposed within a chamber. Detection signals of the pressure sensor and the temperature sensor are sent to a control circuit. A sonic speed of the ultrasonic w... | 04/15/2003 |
| 6490226 | Ultrasonic sonar and method using transmission frequency different from reverberation frequency An ultrasonic sonar has a transceiver equipped with an ultrasonic oscillator. An ultrasonic wave is transmitted from the transceiver. The ultrasonic wave reflected from an obstacle is received by the ultrasonic oscillator to detect the obstacle. The trans... | 12/03/2002 |
| 6427532 | Device for measuring a fill level of a liquid in a container A device for measuring a fill level of a liquid includes an ultrasonic sensor with two sensor elements. One of the sensor elements determines the echo time of an ultrasonic wave to a float which follows the liquid level. The other of the sensor elements d... | 08/06/2002 |
| 6288775 | Lightwave distance measuring apparatus and method A lightwave distance measuring apparatus having a coaxial light-transmitting/receiving type optical system is provided with light-transmitting means for transmitting pulsed light toward an object, light-receiving means for receiving reflected pulsed light... | 09/11/2001 |
| 6267042 | Position detector for fluid cylinder A position detector includes a fluid cylinder having a piston. An ultrasonic transceiver is provided at one end of the piston outside of the moving range of the piston. In response to electrical signals, the ultrasonic transceiver transmits ultrasonic wav... | 07/31/2001 |
| 5805526 | Echo detection doppler gate An automatic control system is disclosed herewith which causes the notch ter incorporated in a sonar system or any other appropriate utilization apparatus to be electrically by-passed in response to a predetermined minimum doppler present within a data s... | 09/08/1998 |
| 5793704 | Method and device for ultrasonic ranging A method and device for ultrasonic ranging. As in prior art devices, ultrasound pulses are transmitted by the device towards a target, and echo pulses from the target are received. The timing of the maximum of the amplitude envelope of the echo pulses is ... | 08/11/1998 |
| 5771204 | Apparatus and method for measuring relative phase of signals in a multiple-echo system An apparatus and method for measuring the relative phase of echo signals in a multiple-echo system. A signal generator generates an exciting tone burst and subsequent tone bursts delayed in phase from the exciting tone burst. The exciting tone burst is ga... | 06/23/1998 |
| 5635662 | Method and apparatus for avoiding detection by a threat projectile A method and apparatus for use by a personnel in combat unit to assess in bstantially real-time the threat to a combat unit posed by one or more threat projectiles. A command and control system receives a variety of input data and information signals and ... | 06/03/1997 |
| 5540098 | Transfer device A transfer device an ultrasonic sensor having an oscillating section for oscillating an ultrasonic beam toward wafers which are horizontally arranged in a carrier and a receiving section for receiving a reflected ultrasonic wave, and driving mechanism for... | 07/30/1996 |
| 5511041 | Process for setting the transmission frequency of a distance measuring instrument operating according to the echo-sounding principle In order to set a range finding instrument operating according to the echo-sounding principle using sonic or ultrasonic pulses to an optimum transmission frequency, the transmission frequency is altered stepwise within a predetermined frequency range. Dur... | 04/23/1996 |
| 5508974 | Method and device for ultrasonic distance measuring In a device for measuring the distance to an obstacle, a second transmission pulse as a control measurement for an ultrasonic distance measurement is transmitted only when an echo signal has been received for a first transmission pulse. In addition, a tim... | 04/16/1996 |
| 5402118 | Method and apparatus for measuring traffic flow This invention aims at providing an traffic flow measurement method and apparatus attaining the stable measurement without being affected by the change in the brightness of the external environment such as daytime vehicle front, et al. In order to achive ... | 03/28/1995 |
| 5392034 | Vehicle classification system using profile A vehicle classification system automatically identifies types of vehicles traveling along a vehicle lane of toll road. The system has a detector for detecting the passage of the vehicle at a plurality of positions along the vehicle lane. The system furth... | 02/21/1995 |
| 5107271 | Target track assessment The invention provides a method of and apparatus for determining if a newly reported target is correlatable with target tracks already stored in a data base. Correlation is effected in stages rejecting uncorrelatable stored target tracks and accepting clo... | 04/21/1992 |
| 5068832 | Binaural ultrasound detector and imager A frequency translator converts inaudible sounds into audible sounds while reserving the phase relationship of the sounds. The translator mixes a local reference frequency with an inaudible receive signal to translate the receive signal to an audible frequ... | 11/26/1991 |
| 4989186 | Target tracking sonar with false target detector A target tracking sonar system associated with a moving platform incorporates a Kalman filter model and a false target detection capability characterized by comparison of the estimated and actual acceleration to produce an error value which, if greater th... | 01/29/1991 |
| 4961174 | High data rate continuous wave towed sonar A continuous wave, doppler sonar has an underwater towed portion including projector disposed vertically displaced from a multi-element receiving array. Received CW signals are processed for spillover elimination and subjected to phase lock loop tracking ... | 10/02/1990 |
| 4959817 | Intruder target monitoring sonar alarm system A system for detecting the presence of intruder targets in an area under ar surveillance and in which the number of normal targets may vary, including the processing of gated time sample receiver signals through a first monitoring circuit having a counte... | 09/25/1990 |
| 4954999 | Double phase-lock-loop sonar A doppler compensated sonar systems is disclosed as containing one or more ata processing channels connected through a multiplexer to a like plurality of piezoelectric elements in a reversible electro-acoustical transducer. Each channel thereof includes a ... | 09/04/1990 |
| 4860266 | Method for operating a transmitting/receiving circuit and a circuit utilizing the method A transmitting/receiving circuit for an acoustic transducer (W1, W2) wherein the transmitting transducer (W1) is sequentially controlled by different modulated carrier frequencies (f1, f2), where the control is first matched to the inherent frequency (f1)... | 08/22/1989 |
| 4845685 | Digital phase-locked loop A digital phase-locked loop provides substantially real-time measurements of frequency differences between an applied input signal and a reference signal. The system is especially adapted for the measurement of Doppler frequency shift in a Doppler sonar d... | 07/04/1989 |
| 4802148 | Side-looking sonar apparatus A side-looking sonar system utilizing an extremely long arc transducer for ultra high resolution work. The transducer is made up of a plurality of segments each connected to signal processing apparatus which electronically varies the focus of the transduc... | 01/31/1989 |
| 4789941 | Computerized vehicle classification system A computerized ultrasonic system is disclosed for classification of vehicular traffic, as at a toll collection booth. An ultrasonic ranging unit is mounted above the traffic lane, facing downward. The unit is activated by the presence of a vehicle and pro... | 12/06/1988 |
| 4712200 | Device for processing modulated signals received by a lateral sonar system A device for processing echoes back scattered from the surface of the sea bed in response to sound pulses transmitted by a fish towed while immersed, comprising at least one assembly for determining the components XC and XS of the co... | 12/08/1987 |
