Abstract:
A locating system for determining a position of an object comprises a transmitting station that transmits a first ID signal containing a first identifier of this transmitting station; a receiving station that receives the first ID signal, measures the intensity of the first ID signal, and extracts the first identifier; a data management unit that stores and manages the intensity in association with the first identifier, the intensity and the identifier being supplied from the receiving station; and a positioning computer that estimates the position of the transmitting station using a first correcting formula defining a relation between the intensity and the distance, based on the data stored in the data management unit.
Abstract:
The invention is a process relating to the processing of the signals sent by passive buoys dropped from an aircraft so as to compile EGP (Energy Geographic Plot) maps. The process is split into three steps: the first makes it possible to produce an EGP map of the x,y positions of the noise sources, the second makes it possible to associate the velocities Vx,Vy with certain designated positions and the third makes it possible to eliminate the noise sources regarded as hampering the readability of the maps.
Abstract translation:本发明涉及处理从飞行器掉落的被动浮标发送的信号,以编译EGP(能量地理图)图。 该过程分为三个步骤:第一步使得可以产生噪声源的x,y位置的EGP图,第二个使得可以将速度V X,V, SUB> y SUB>,而第三个可以消除被认为妨碍地图的可读性的噪声源。
Abstract:
A method and corresponding system for tracking variations in distance D calculated from time-of-flight measurements of a sequence of pulses of a pressure wave oscillation from a transmitter to a receiver identifies a state of synchronous operation by obtaining at least two time-of-flight measurements derived from successive pressure wave pulses which satisfy given synchronicity criteria. Successive time-of-flight measurements are then monitored to identify a shifted time-of-flight measurement which varies by at least half of the wave period from a predicted time-of-flight value calculated from a number of preceding time-of-flight measurements. A shift factor is then identified corresponding to an integer multiple of the wave period by which the shifted time-of-flight measurement must be corrected to obtain a corrected time-of-flight measurement falling within half of the wave period from the predicted time-of-flight value. The distance D calculated from the shifted time-of-flight measurement is then corrected by the product of the shift factor and the pressure wave wavelength.
Abstract:
A system for carrying out surgery on a bodily structure (e.g., breast and liver) with greater precision, accuracy, comfort and minimal invasiveness. A 3-dimensional tracking and imaging system (1000) is used to obtain an accurate position of an instrument as it is maneuvered by an operator, and to mark a location on the subject bodily structure. The system is particularly advantageous for surgical procedures for biopsying and destroying tumors in bodily structures which are easily deformable.
Abstract:
An acoustic tracking system designed to allow scientists and fishermen to follow dolphins and whales without harming or harassing them. The system utilizes six flow shielded hydrophones mounted on the bottom of a vessel in two arrays of three hydrophones in each array. Acoustic signals of interest (dolphin calls) which strike the hydrophone piezo-electric elements are transmitted to a receiver-display device which determines and displays both the bearing to the signal of interest and the relative range from the vessel to that signal. The receiver-display device utilizes digital microprocessors to determine the difference in signal arrival time of an incoming signal at pairs of hydrophones. The resulting computed bearing to the dolphin call is displayed as a lighted indicator on an electronic heading display. In addition, the digital microprocessors compare the received sound pressure level of incoming signals of interest and display the relative range as a series of lighted LED's on the electronic heading indicator.
Abstract:
The present invention is directed to provide an underwater detection system which can determine frequency components contained in echoes arriving from all azimuthal directions at high speed and enhance target discriminating capabilities by presenting such frequency components.The underwater detection system rotates a pair of ultrasonic receiving beams having a fixed phase angle difference, measures phase differences between two signals picked up by both ultrasonic receiving beams, determines carrier frequencies contained in target echoes from the phase differences, derives magnitudes and directions of moving velocities of targets from the carrier frequencies, and displays such target data in different colors. Furthermore, it provides such information as over-the-ground velocities of targets themselves upon compensating target velocity data with ship velocity data.
Abstract:
The multidimensional ECG processing and display system of the present invention is used with an electrocardiographic (ECG) monitoring system. Input ECG data from multiple, sequential time intervals is collected and formatted into a two-dimensional matrix. The two-dimensional matrix is decomposed using singular value decomposition (SVD) to obtain its corresponding singular values and singular vectors, a compressed form of the matrix. The singular vectors are analyzed and filtered to identify and enhance signal components of interest. Selected singular vectors are transformed into their frequency domain representations by the Fast Fourier Transform (FFT), or related techniques. Certain data elements in the two-dimensional matrix are enhanced or diminished by modifying the singular values within groups of singular vectors to enhance certain objects that are associated with the ECG data and to diminish other features within the data. The enhanced data is expanded back into its original form and features in the ECG data are displayed as opaque objects within a transparent data cube.
Abstract:
A distance measuring apparatus and method using an acoustic signal. It includes a transmitting probe for transmitting an acoustic signal from a transmitter, a plurality of receiving probes having resonance frequencies different from the central frequency of the signal transmitted from the transmitting probe, and a control circuit for controlling the functions of those probes. The acoustic signal is received by a receiving probe having a resonance frequency which provides the maximum received-signal sensitivity at the central frequency of the received acoustic signal under the control of the control circuit to thereby measure a long distance accurately.
Abstract:
Aquatic animal finder apparatus and method include one or more passive transducers for converting sounds, including bio-soundwaves from a living aquatic animal source traveling in a body of water, to electrical signals, the transducer is caused to scan about a selected axis, the electrical signals are filtered to eliminate all man-made signals of a periodic character and pass bio-sound electrical signals. A discriminator is connected to the filter and programmed to pass a predetermined pattern of the bio-soundwave electrical signals constituting a sonic profile, signature or imprint of a selected aquatic animal. The direction of a selected aquatic animal is detected and presented to the user and range, depth and direction of movement of the selected aquatic animal are determined solely from the biosound signals received from the aquatic animal.
Abstract:
An acoustic signal receiving and processing circuit provides an output signal that enables a distance to be determined between a transmitter and a sensor. The circuit comprises a sensor which receives both noise and acoustic position signals, the acoustic signals arriving after a time delay indicative of distance between the signal's transmitter and a sensor. A level control circuit provides a plurality of output potentials, one of which is a ramp signal and another is a neutral voltage, the ramp signal produced in response to a start signal manifestation. A comparator circuit, has a pair of inputs connected to the level control and sensor circuits, respectively. The comparator circuit produces a first output signal in response to a potential on one of its inputs exceeding a potential on another of its inputs, i.e. when a voltage transition of a received acoustic signal initially passes a voltage manifested by the ramp signal. A signal detection circuit is responsive to the first output signal from the comparator circuit to cause the level control circuit to apply the neutral voltage to the comparator circuit. The comparator circuit then produces a second output signal upon a subsequent transition of the received acoustic signal past the neutral voltage, resulting in a "zero crossing" detection of the received signal. A further circuit is responsive to a start signal to commence an interval manifestation and to a detection of the second output signal to terminate the interval manifestation, whereby the interval manifestation is indicative of the distance between the transmitter and sensor.