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5703594 |
Method for remotely detecting tides and the height of other surfaces
Transmitted signals are used to accurately and remotely determine the veral distance of an earth-based receiving antenna above a surface, and hence can be used to determine the tide condition of a...
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5694129 |
Method of imminent earthquake prediction by observation of electromagnetic field and system for carrying out the same
A seismic electromagnetic field signal is detected at each of observation stations installed at at least two places, and civil noise and atmospheric discharge noise are eliminated from the signal...
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5684489 |
Position-finding apparatus for locating a vehicle travelling along means for propagating electromagnetic waves
The present invention relates to apparatus for locating a vehicle V travelling along propagation means P. An object of the apparatus of the invention is to determine the position of the vehicle V,...
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5682164 |
Pulse homodyne field disturbance sensor
A field disturbance sensor operates with relatively low power, provides an adjustable operating range, is not hypersensitive at close range, allows co-location of multiple sensors, and is...
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5680048 |
Mine detecting device having a housing containing metal detector coils and an antenna
A device detects metallic and non-metallic objects on, flush with, or covered by the ground or other surfaces, or by interfering or obscuring structures or surfaces, using ground penetrating radar,...
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5673050 |
Three-dimensional underground imaging radar system
An ultra-wide band ground penetrating radar (GPR) system providing non-invasive detection and three-dimensional mapping of underground objects and voids. The performance of this radar provides...
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RE35607 |
Distance measuring method and apparatus therefor
A distance measuring method and apparatus in which first and second pseudo random signals which are the same in pattern but slightly different in period are generated to obtain a correlation output...
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5668555 |
Imaging system and apparatus
A three dimensional imaging system that utilizes an ultra-wideband radar circuit, a focused radar antenna, an erasable programmable read only memory (EPROM) means which includes a translational...
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5647439 |
Implement control system for locating a surface interface and removing a layer of material
An apparatus coupled to a work machine for assisting the work machine in removing a first layer of material from a second layer of material is provided. The work machine includes a work implement...
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5644314 |
Portable geophysical system using an inverse collocation-type metehodology
The invention pertains to a hand-held or vehicle mountable portable procer based high resolution radar system for detecting and identifying an object by using high resolution radar. In particular,...
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5614893 |
Ground condition monitor
A ground condition monitor includes a housing for disposal underground, a power source disposed in the housing, and a controller disposed in the housing and in communication with the power source...
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5608408 |
Method of sounding a channel
To reduce emission power, the sounding of a channel comprises a space-of-change transformation of M columns with N initial samples having equal time ranks in the last N impulse responses of a...
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5598152 |
Mine sweeping system for magnetic and non-magnetic mines
A mine sweeping system including deployable horizontal antennas to establ a detection and navigation grid extending underwater from a beach to a distance offshore. A computer-controlled transmitter...
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5592170 |
Radar system and method for detecting and discriminating targets from a safe distance
A frequency-agile, narrow-instantaneous bandwidth radar system detects objects, and discriminates between different types of objects, from a safe stand-off distance. Transmit circuitry transmits a...
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5557277 |
Method for locating leakage of substances from subterranean structures
A method for imaging substances leaking from underground structures using continuous-wave signals includes translating an antenna array over the ground, transmitting a continuous-wave signal into...
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5552786 |
Method and apparatus for logging underground formations using radar
A method of logging an underground formation from within a borehole includes the steps of emitting an electromagnetic signal from a first location in a borehole, determining a time at which the...
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5541605 |
Swept range gate short range radar system
A cost-effective ultra-wideband band radar system capable of locating nearby buried objects such as reinforcing steel rods, pipes, and other objects buried in concrete, soil, behind walls, or in...
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5523758 |
Sliding correlator for nanosecond pulses
A digital sliding correlator having means for producing a series of time-shifted stored copies of a digital character, means responsive to said shifted, stored copies of the character for...
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H001524 |
Method for using electromagnetic grounded antennas as directional geophones
A method of seismic prospecting using electromagnetic grounded antennas to detect electromagnetic waves that are produced from acoustic waves in the earth's formation. Seismic waves reflected by a...
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5502444 |
Method and apparatus for improving the signal-to-clutter ratio of an airborne earth penetrating radar
The method improves the signal-to-clutter ratio of an airborne earth penetrating radar for distinguishing subsurface objects from surface clutter or above-ground objects. The method relies on the...
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5500649 |
Method and apparatus for monitoring the thickness of a coal rib during rib formation
Apparatus for monitoring the position of a mining machine cutting a new entry in a coal seam relative to an adjacent, previously cut entry to determine the distance between a near face of the...
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5499029 |
Wide band stepped frequency ground penetrating radar
A wide band ground penetrating radar system (10) embodying a method wherein a series of radio frequency signals (60) is produced by a single radio frequency source (16) and provided to a transmit...
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5486833 |
Active signalling systems
A signalling system in time-frequency space for detecting targets in the presence of clutter and for penetrating media, includes a transmitter antenna system, receiver and processor system. The...
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5463597 |
Fish locator
A system for communicating to a fisherman information relating to fish in water in the vicinity of a fishing lure or hook which is connected to a conventional non-electrically conducting fishing...
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5457394 |
Impulse radar studfinder
An impulse radar studfinder propagates electromagnetic pulses and detects reflected pulses from a fixed range. Unmodulated pulses, about 200 ps wide, are emitted. A large number of reflected pulses...
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5446461 |
Concrete penetrating imaging radar
An imaging radar system for generating images of objects disposed behind an obscuring structure. The system comprises a low power, frequency tunable, continuous wave transmitter and an antenna...
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5444441 |
Electro-optical detection system for reflection free underwater images from aircraft
An electro-optical detection system for detecting objects 12 embedded within a partially transmitting medium comprises means 20 to receive electro-magnetic radiation in two close spectral channels...
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5420589 |
System for evaluating the inner medium characteristics of non-metallic materials
A pulse radar system for determining the subsurface structure of a medium comprising an electronics unit for providing electronic signals and control comprising a utility controller, a sampler...
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5400030 |
Detection and mapping of hydrocarbon reservoirs with radar waves
Radar is used to detect and map near-surface geochemical alteration of rock and soil. The radar waves penetrate a buildup of carbonate and silica on the earth surface above micro-seepage of...
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5392046 |
Entropy based signal, transmission, reception and signal analysis method and apparatus
An entropy based signal transmission, reception and analysis method and apparatus in which the entropy of time dependent signals is determined by utilizing a selected Green's function relationship....
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5363106 |
Method for evaluating internal quality of fused cast refractories
A method for evaluating internal quality of fused cast refractories including the steps of: emitting electromagnetic wave pulses from sending and receiving antennas moving vertically in the...
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5357253 |
System and method for earth probing with deep subsurface penetration using low frequency electromagnetic signals
An earth probing system uses deep penetration of electromagnetic waves into soil and other media. Advantage is taken of the lower attenuation of radar waves in soil by frequencies of about three...
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5345240 |
Handheld obstacle penetrating motion detecting radar
A motion detection radar system comprised of a low power frequency tunable continuous wave transmitter and antenna, a receiver, an FM transmitter and antenna, and a handheld remote FM receiver. The...
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5339080 |
Earth-penetrating synthetic image radar
An earth-penetrating synthetic image radar system includes a frequency generator, a transmitter, a microprocessor-based timing and frequency controller, a reference receiver, a parallel polarized...
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5337053 |
Method and apparatus for classifying targets
A method and apparatus for classifying objects based upon information conned in the fourth order cumulant derived from energy from the object. Successive pulse returns in active systems and samples...
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5327139 |
ID microwave holographic sensor
A method and apparatus for measuring both physical and electrical properties of a dielectric object using sequential spatial and spectral microwave data. The apparatus is a step CW microwave...
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5325095 |
Stepped frequency ground penetrating radar
A stepped frequency ground penetrating radar system is described comprising an RF signal generating section capable of producing stepped frequency signals in spaced and equal increments of time and...
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5323114 |
Method and apparatus for obtaining sectional information of the underground by measuring time differences and strength of electromagnetic signals
An underground radar tomography in which an electromagnetic wave is radiated into the ground, the amplitude and propagation time of a transmitted wave, a reflected wave or a diffracted wave of the...
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5287740 |
Method for locating and examining cavities under paved roads
The present invention provides a cavity examination method of a paved road which can examine cavities which are present under the paved road such as the asphalt-paved road in a reduced length of...
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5280284 |
Method of determining the electrical properties of the earth by processing electromagnetic signals propagated through the earth from a capacitor
A method of processing electromagnetic signals which are injected into the earth from a capacitor and subsequently detected after reflection from subsurface layers, in order to determine the...
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5248975 |
Ground probing radar with multiple antenna capability
A ground probing radar system comprising a plurality of antennas for transmitting. Where for each transmitting antenna, an associated individual driver means selectively operable in response to an...
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5247302 |
Entropy-based signal receiver
The entropy-based signal receiver uses the entropy of a received signal or a quantity that is closely related to entropy as the means to measure changes in the signal as a function of time or...
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5227797 |
Radar tomography
A radar tomography method and apparatus usable in industrial applications emits a plurality of radar pulses toward an adjacent object. A transmitter provides the plurality of radar pulses to the...
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5227799 |
Road void search radar system
A road void search radar system includes a rotary encoder, a radar controller, an analyzer, and a recording unit. The rotary encoder generates a pulse signal having a period corresponding to a...
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5192953 |
Pavement structure examination vehicle
A pavement structure examination vehicle capable of mounting all necessary equipments and instruments therein; including a body of a rear gate type having a rear door which rotates vertically to...
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5192952 |
Method and apparatus for transmitting electromagnetic signals into the earth from a capacitor
A method and apparatus in which a capacitor is disposed in direct contact with the earth, and a short voltage pulse is applied to the capacitor to transmit a pulse of electromagnetic radiation...
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5172110 |
Indicator apparatus for the recovery of skiers buried by avalanches
Indicator apparatus used for recovery of skiers buried by avalanches, includes cooperating transmitters and receivers carried by skiers and by search and rescue personnel. The indicator device...
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5159343 |
Range information from signal distortions
An electromagnetic signal having originally the time variation of a rectangular pulse is radiated into a lossy medium with conductivity σ. It is distorted by the medium to the distorted...
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5130711 |
Subsurface target identification radar
Subsurface target identification radar includes an antenna array, a rotary encoder, a radar controller, a polarization switching circuit, and transmitter and receiver circuits. The antenna array is...
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5124709 |
Method and apparatus for detecting fire, explosion, and/or projectile penetration
A method and apparatus for detecting the occurrence of a fire or an explosion in a monitored space, or the penetration of a projectile through a barrier, by: transmitting to the monitored space an...
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