Sensitivity Time Control (stc) Patents (Class 342/205)
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Patent number: 11258408Abstract: An apparatus is provided which comprises: a low-side switch; at least two high-side switches coupled to the low-side switch; a supply boost circuitry coupled to one of the at least two high-side switches; and a high-side switch selection circuit which is operable to enable one of the at least two high-side switches according to a relative difference between a signal and a threshold.Type: GrantFiled: July 8, 2019Date of Patent: February 22, 2022Assignee: Intel CorporationInventors: Stephan Henzler, Wenjian Wang
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Patent number: 9720077Abstract: A method and system for adjusting a gain from a receiver antenna. The method may include accessing a radio altimeter data structure for antenna gain data. The antenna gain data may be associated with one or more antennas including a receiver antenna. Additionally, the method may include receiving aircraft maneuver data from a reference system. Furthermore, the method may include adjusting a gain from the receiver antenna based at least on the aircraft maneuver data.Type: GrantFiled: April 17, 2014Date of Patent: August 1, 2017Assignee: Rockwell Collins, Inc.Inventor: Madjid N. Sarpoolaki
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Patent number: 9465106Abstract: Embodiments of the invention are directed toward attenuation correction of radar data. Atmospheric attenuation is a function of atmospheric water drop size and temperature. A number of different theoretical models are available to mathematically describe the particle drop shape that influences attenuation estimation. Each of these models has proven effective in different scenarios. It can be difficult, however, to predict which theoretical model to use. The total differential phase gives an idea of the attenuation, but it depends on the model. Moreover, the total attenuation along a rain path must be apportioned to different parts of the radar path in order to correct for attenuation along a radar path. Embodiments of this invention allows for a system to apportion the attenuation to different parts of the radar beam. Embodiments of the invention also allow for optimization of a number of different theoretical models for both drop size and temperature.Type: GrantFiled: March 15, 2013Date of Patent: October 11, 2016Assignee: Colorado State University Research FoundationInventors: Chandrasekaran Venkatachalam, Sanghun Lim
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Patent number: 8755037Abstract: An optical device is disclosed that may be employed in distance measuring devices. In at least one embodiment, the optical device includes a control unit that is adapted to cause at least one control signal generator unit to generate at least one control signal according to a predetermined temporal function on the basis of an elapsed time from a predetermined point in time. On the basis of the generated at least one control signal, at least one parameter of a receiver unit may be adjusted during the travel time of the optical pulse, wherein the at least one parameter affects the dynamic range of the receiver unit. In this way, the dynamic range of the receiver unit may be increased. A method is further disclosed for operating such an optical device, along with a distance measuring device including such an optical device and a surveying instrument including such a distance measuring device.Type: GrantFiled: June 26, 2009Date of Patent: June 17, 2014Assignee: Trimble ABInventor: Yuri P. Gusev
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Patent number: 8599060Abstract: The present invention relates to a system (300) for reducing or cancelling unwanted signals when detecting objects of interest with a detection system (200). The detection system thereby is an antenna based system using two or more receive beams as echo response to an emission signal. The system (300) for reducing or cancelling unwanted signals comprises an input means (310) adapted for obtaining from said antenna system (210) receive signals from a first receive beam and receive signals from at least one second receive beam responsive to the same emission signal. It furthermore comprises a coupling means (320) adapted for coupling the receive signals from the first receive beam to the receive signals from the at least one second receive beam, so as to obtain a detection signal for the objects of interest with suppressed unwanted signal contribution.Type: GrantFiled: September 30, 2009Date of Patent: December 3, 2013Assignee: Intersoft Electronics NVInventor: P. G. Marcel Vanuytven
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Patent number: 8456352Abstract: Methods and apparatus to receive radar return information from signals transmitted by a radar, process the radar return information to identify sea clutter, process the sea clutter to fit an ellipse to arrange horizon of the sea clutter as a function of azimuth to determine a sea state, and select sensitivity time control (STC) attenuation of the sea clutter based upon the sea state.Type: GrantFiled: December 17, 2010Date of Patent: June 4, 2013Assignee: Raytheon CompanyInventor: Thomas E. Wood
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Publication number: 20120293361Abstract: Sidelobe suppression methods and systems for use in processing radar video streams generated by rotational radar antenna scanners. The sidelobe suppression methods function in parallel with traditional Sensitivity Control (SC) processing by selectively reducing sensitivity where necessary depending on sidelobe suppression schemes that can be either directional, omni-directional (non-directional), or a combination of these.Type: ApplicationFiled: May 17, 2012Publication date: November 22, 2012Inventors: Robert Stephen Mowbray, Roger Phillips
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Patent number: 8223065Abstract: A method according to an aspect of the disclosure is for partitioning a radar acquisition volume, the method comprising the steps of: determining an allocated time to search an unpartitioned volume; determining a number of beam rows in an unpartitioned acquisition face; determining an average per-row search time for searching the angular region based on the determined allocated time and determined number of beam rows in an unpartitioned acquisition face; determining a number of beam rows in an allotted acquisition period that is searchable based on the average per-row search time; calculating a maximum elevation extent based on the number of beam rows in the allotted acquisition period; and searching an angular extent of the search volume based on the calculated maximum extent.Type: GrantFiled: September 20, 2010Date of Patent: July 17, 2012Assignee: Lockheed Martin CorporationInventor: Mark Friesel
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Publication number: 20120154208Abstract: Methods and apparatus to receive radar return information from signals transmitted by a radar, process the radar return information to identify sea clutter, process the sea clutter to fit an ellipse to arrange horizon of the sea clutter as a function of azimuth to determine a sea state, and select sensitivity time control (STC) attenuation of the sea clutter based upon the sea state.Type: ApplicationFiled: December 17, 2010Publication date: June 21, 2012Applicant: Raytheon CompanyInventor: Thomas E. Wood
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Patent number: 8174435Abstract: Methods and apparatus to provide computing, using a processor, sea clutter threshold bias values as a function of range and azimuth, receiving a first shape corresponding to a first region of sea clutter about a radar, combining the sea clutter threshold bias values with the first shape to provide non-isotropic sensitivity time control (STC) for the radar, and outputting radar return for display with sea clutter suppressed in the first shape.Type: GrantFiled: June 1, 2010Date of Patent: May 8, 2012Assignee: Raytheon CompanyInventors: Amir W. Habboosh, Nicholas F. Willis, Thomas E. Wood
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Patent number: 8004451Abstract: A method and apparatus are provided for operating a microwave detector for detecting intruders within a secured area. The method includes the steps of selecting a noise floor based upon a setting of a range setting potentiometer, detecting a magnitude of a signal reflected from a test subject within the secured area that exceeds the selected noise floor and establishing a threshold value for detecting an intruder based upon the magnitude of the detected signal and sensor mounting height.Type: GrantFiled: May 27, 2009Date of Patent: August 23, 2011Assignee: Honeywell International Inc.Inventors: XiaoDong Wu, Roy Phi, Dave Eugene Merritt
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Patent number: 7796082Abstract: Methods and apparatus to provide Log-Amp-detected radar sea clutter voltage modeled by a polynomial, such as a cubic polynomial, and using that model as a basis for sea clutter reduction filtering. In an exemplary embodiment, a navigational radar includes an STC filter design based on the cubic sea clutter modeling.Type: GrantFiled: February 8, 2007Date of Patent: September 14, 2010Assignee: Raytheon CompanyInventor: Thomas E. Wood
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Patent number: 7693499Abstract: In a transmission path, an input signal is amplified in a manner dependent on a digital control word present and is processed by an arrangement for signal processing to form an output signal. A digital setting word is read out from a memory device in a manner dependent on the digital control word, setting signals being derived from said setting word. The gain setting of the amplifier and the operating mode of the arrangement for signal processing are influenced by the setting signals.Type: GrantFiled: October 16, 2006Date of Patent: April 6, 2010Assignee: Infineon Technologies AGInventor: Rainer Koller
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Patent number: 7576683Abstract: In one aspect, a method of radar altimeter operation including a time dependent gain control is described. The method comprises triggering a Sensitivity Time Control (STC) gain control signal at a pulse repetition frequency (PRF) of a transmit pulse to attenuate interference from at least one of an antenna leakage signal and a signal reflected from equipment. The method also includes shaping the STC gain control signal from no attenuation at a first time, before a transmitter sends the transmit pulse, to a stable maximum attenuation at the time the transmitter sends the transmit pulse, to no attenuation at a second time, after the transmitter sends the transmit pulse. The method also includes matching a bandwidth of an intermediate frequency (IF) amplifier to the pulse width of a transmitted pulse.Type: GrantFiled: August 7, 2006Date of Patent: August 18, 2009Assignee: Honeywell International Inc.Inventors: Steven H. Thomas, Glen B. Backes, Timothy J. Reilly
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Patent number: 7551988Abstract: A designated function or “golden” slot for implementing and managing re-configurable SDR modules is provided. In an embodiment, the slot includes at least one radio frequency (RF) front end for providing an interface with at least one antenna. In addition, the slot may include at least one slot modem coupled to the RF front end for implementing at least one designated function and at least one input/output (I/O) module coupled to the slot modem. The designated function or “golden” slot is capable of implementing and managing the at least one designated function in a re-configurable module during standard and emergency operations.Type: GrantFiled: April 5, 2006Date of Patent: June 23, 2009Assignee: Rockwell Collins, Inc.Inventors: Joel M. Wichgers, Demetri Tsamis, Terrence L. Leier, Gregory A. Arundale
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Publication number: 20090096663Abstract: In one aspect, a method of radar altimeter operation including a time dependent gain control is described. The method comprises triggering a Sensitivity Time Control (STC) gain control signal at a pulse repetition frequency (PRF) of a transmit pulse to attenuate interference from at least one of an antenna leakage signal and a signal reflected from equipment. The method also includes shaping the STC gain control signal from no attenuation at a first time, before a transmitter sends the transmit pulse, to a stable maximum attenuation at the time the transmitter sends the transmit pulse, to no attenuation at a second time, after the transmitter sends the transmit pulse. The method also includes matching a bandwidth of an intermediate frequency (IF) amplifier to the pulse width of a transmitted pulse.Type: ApplicationFiled: August 7, 2006Publication date: April 16, 2009Inventors: Steven H. Thomas, Glen B. Backes, Timothy J. Reilly
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Publication number: 20090085799Abstract: In a pulse radar system where received echo pulses are expanded in time by multiplication with sampling pulses and subsequent integration, the effect of disturbances on the integration is reduced by using a sample and hold circuit having a switch and a hold capacitor and wherein the switch is closed only when a sampling pulse is applied for the multiplication.Type: ApplicationFiled: September 16, 2008Publication date: April 2, 2009Inventor: Gabriel Serban
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Patent number: 7499796Abstract: A driver information device with a map display is designed in such a way as to make the map display clear and easy to read. This is achieved, in cases where multiple special objects are situated at one location on the map, through the use of an indicator symbol representing such special objects, with a selection menu for selecting individual special objects, instead of displaying an individual symbol for each one of them.Type: GrantFiled: June 20, 2003Date of Patent: March 3, 2009Assignee: Robert Bosch GmbHInventors: Holger Listle, Andre Barkowski
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Patent number: 6972709Abstract: A transceiver that includes a radio frequency source comprised of a monolithic millimeter wave integrated circuit. The transceiver generates a signal of a first frequency, which is then converted to a signal of a second frequency as the signal is conveyed through the transceiver. The value of the second frequency exceeds that of the first frequency.Type: GrantFiled: August 26, 2002Date of Patent: December 6, 2005Assignee: Yazaki North America, Inc.Inventors: Jake Deem, Terry B. Wilson
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Patent number: 6965341Abstract: A stepped-frequency chirped waveform improves SAR groundmapping for the following reasons. Range resolution in SAR image is inversely proportional to the transmitted signal bandwidth in nominal SAR systems. Since there is a limit in the transmitted bandwidth that can be supported by the radar hardware, there is a limit in range resolution that can be achieved by processing SAR data in conventional manner. However, if the frequency band of the transmitted signal is skipped within a group of sub-pulses and received signal is properly combined, the composite signal has effectively increased bandwidth and hence improvement in range resolution can be achieved. The proposed new and practical approach can effectively extend the limit in range resolution beyond the level that is set by the radar hardware units when conventional method is used.Type: GrantFiled: December 15, 2003Date of Patent: November 15, 2005Assignee: The United States of America as represented by the Secretary of the Air ForceInventors: Kwang Myung Cho, Leo H. Hui
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Patent number: 6903679Abstract: A video amplifier for a radar receiver includes a temperature compensating attenuator. The attenuator includes a temperature sensitive device, such as a thermistor, arranged in a voltage divider network and is coupled in cascade between two filter stages. Each of the filter stages has a bandpass characteristic in order to filter low-frequency leakage signals and provide sensitivity control based on frequency and thus range, while also filtering high frequency signals to reduce aliasing.Type: GrantFiled: August 16, 2001Date of Patent: June 7, 2005Assignee: Raytheon CompanyInventors: James T. Hanson, Walter Gordon Woodington, Michael Joseph Delcheccolo, Joseph S. Pleva, Mark E. Russell, H. Barteld Van Rees
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Patent number: 6842139Abstract: A separation frequency detector circuit and a method for detection of a separation frequency in a radar level gauge. A first circuit element (1) is arranged to receive a first clock frequency, and a second clock frequency. An instantaneous value of the first clock frequency will be transferred to and held at an output Q of the first circuit element (1) once each period of the second clock frequency. A predetermined value will be transferred to and held at an output Q of a second circuit element (3) triggered by the output Q of the first circuit element (1), and the predetermined value will be cleared from the output Q of the second circuit element (3) a predetermined time period after being triggered. An output is obtainable as a short pulse with a leading edge which will be synchronized with the first change of the leading signal edge of the first circuit element (1).Type: GrantFiled: October 20, 2003Date of Patent: January 11, 2005Assignee: Saab Rosemount Tank Radar ABInventor: Leif Nilsson
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Patent number: 6741203Abstract: A system and method for adapting weather radar gain is disclosed. The system and method includes estimating a freezing altitude. The system and method also includes determining, based on the freezing-altitude estimate, the altitude of more than one atmospheric layer. The system and method further includes determining the proportion of a radar beam sample in each atmospheric layer and adjusting the radar gain, based on the proportion.Type: GrantFiled: October 28, 2002Date of Patent: May 25, 2004Assignee: Rockwell CollinsInventor: Daniel L. Woodell
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Publication number: 20030100285Abstract: A sensor front end for an electronic radar sensor is disclosed that provides for a lower parts count while providing technical functionality by using multifunction parts, i.e., parts that are used both in transmitting and receiving. The sensor front end includes a continuous wave signal source that functions as a signal source when the front end is transmitting a signal and as a local oscillator when the front end is receiving a signal. The sensor front end also includes a tri-mode mixer that functions as a phase-modulator and transmit switch when the front end is transmitting a signal and as a mixer/down-converter when the front end is receiving a signal. The sensor front end further includes a common aperture antenna that acts as both a transmitting antenna for transmitting a sensor signal and for receiving a reflected signal from a object.Type: ApplicationFiled: November 28, 2001Publication date: May 29, 2003Applicant: TYCO Electronics CorporationInventor: Kenneth V. Puglia
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Patent number: 6404378Abstract: A device for increasing the dynamic range of frequency-modulated continuous-wave radar includes a transmitter, a send/receive antenna, a receiver circuit and a circulator. The circulator relays the transmission signals of the transmitter to the send/receive antenna and sends the echo signals of a target object to the input of the receiver circuit, which generates on the basis of the transmission signals and echo signals an intermediate frequency signal having a differential frequency corresponding to the distance from the target object. A reflected power canceler circuit equipped with a control amplifier is provided between the input and output of the receiver circuit. The frequency response of the control amplifier is selected so that the degree of suppression drops to a predeterminable extent with an increase in differential frequency above the cut-off frequency of the control amplifier.Type: GrantFiled: April 24, 2000Date of Patent: June 11, 2002Assignee: DaimlerChrysler AGInventor: Klaus Solbach
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Patent number: 6104197Abstract: An apparatus for acquiring waveform data from a metallic transmission cable under test includes a transmitter for generating interrogating pulses for examining a segment or segment lengths of the transmission cable under test. A variable gain receiver receives a return signal from the segment or segment lengths of the cable and generates at least two gain segment acquisitions of waveform data representative of the signal from each segment or segment lengths with each gain segment acquisition of waveform data being generated with a different receiver gain. A controller operating under program control initiates the generation of interrogating pulses, establishes the receiver gain for each gain segment acquisition of waveform data, and controls the gain segment acquisitions of waveform data over the segment or segment lengths. An event table is created containing event characterization data for each gain segment.Type: GrantFiled: April 2, 1998Date of Patent: August 15, 2000Assignee: Tektronix, Inc.Inventor: Phillip F. Kochan
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Patent number: 6087977Abstract: An improved performance receiver associated with a radar system for detecting targets over a specified range area whereby the receiver, which is responsive to a return signal corresponding to an actual target or a false target, includes: an attenuator for attenuating an amplitude associated with the return signal; sensitivity time control means coupled to the attenuator wherein the attenuation is coordinated to the sensitivity time control means and the attenuation of the return signal is selectively variable such that the amplitude of the return signal is attenuated to a first level at closer ranges of the specified range area and attenuated to a second level at farther ranges of the specified range area, the first level being greater than the second level; a mixer for downconverting the return signal to a signal exhibiting an intermediate frequency; a detector for extracting a target video signal from the downconverted return signal; detection threshold setting means for generating a detection threshold sigType: GrantFiled: March 31, 1997Date of Patent: July 11, 2000Assignee: Cardion Newco, Inc.Inventor: David P. Rost
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Patent number: 5905459Abstract: A radar system and method for operation of the same in a manner in which the false alarm rate is stabilized is provided. The system includes an automatic gain control (AGC) processing function which is utilized to control the pre-processed false alarm rate such that the displayed false alarm rate is substantially intolerant to temperature fluctuations.Type: GrantFiled: April 18, 1997Date of Patent: May 18, 1999Assignee: Honeywell Inc.Inventor: Brian Paul Bunch
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Patent number: 5805107Abstract: For less expensive estimation the impulse response x.sub.MOS of a high-resolution, band-limited radar channel in a radar station operating with an expanded transmitted pulse a(t), from a received signal e, over which a correlated or uncorrelated additive interference signal n can be superimposed, with the use of knowledge about the spread code c and the use of a channel estimator with which a so-called linear, optimum unbiased estimation of the radar channel impulse response x.sub.MOS is performed in a time range covering M range gates of interest, the linear, optimum estimation in the unbiased channel estimator is modified in such a way that the pulse response x.sub.MOS of the band-limited radar channel is determined according to the basic principle of a multiplication of the sampled received signal e and an inverse estimation matrix A.sub.E.sup.-1. The matrix A.sub.E is formed by the extension of the rectangular matrix represented by the components c.sub.Type: GrantFiled: April 18, 1997Date of Patent: September 8, 1998Assignee: Deutsche Forschungsanstalt fur Luft-Und Raumfahrt e.V.Inventors: Arno Schroth, Tobias Felhauer, Walter Baier
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Patent number: 5416501Abstract: A pair of holes are formed with a predetermined space therebetween on a long and narrow base plate. An adhesive is applied to the surface of the base plate. Head substrates each having a row of thermal resistors on the surface thereof are placed on the adhesive on the base plate such that the joint of the head substrates is positioned between the pair of holes of the base plate. The adhesive is hardened in the state in which the head substrates are pushed upward by a thruster(s) means inserted into a pair of holes while the base plate is supported from below and the head substrates is pressed from above. The base plate is bonded to a radiating plate by an adhesive only at the central portion. Thus, there is no difference in level at the joint of the head substrates, and even when the radiating plate expands due to heat, the base plate is not deformed.Type: GrantFiled: August 4, 1993Date of Patent: May 16, 1995Assignee: Rohm Company, LimitedInventors: Toshio Amano, Yoshinobu Kishimoto, Fumiaki Tagashira, Hisayoshi Fujimoto, Shigeo Ota
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Patent number: 5337054Abstract: A four-terminal network in tandem with a tunnel diode (TD) threshold receiver currently used in radar or communications improves its sensitivity. Previous inventors have shown that the temperature and sensitivity properties of a conventional TD threshold device used for detecting very short duration bursts of microwave energy would be enhanced by appropriately biasing the TD by a current derived from the thermal noise; the current sets the TD operating point. The magnitude of the current is determined by a constant false alarm rate (CFAR) feedback loop. The subject invention recognizes that a TD changes states (i.e., a detection event) when the area under the current vs. time curve or the charge passing through the device exceeds a prescribed number of picocoulombs. To maximize the charge and improve detection, a form of superheterodyne conversion is introduced to convert the oscillatory short pulse microwave signal received by an antenna to a monopolar baseband signal.Type: GrantFiled: May 18, 1992Date of Patent: August 9, 1994Assignee: Anro Engineering, Inc.Inventors: Gerald F. Ross, Richard M. Mara
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Patent number: 5311184Abstract: Sensitivity time control (STC) data for an airborne weather radar system is provided as a function of aircraft altitude and radar system antenna tilt angle to normalize radar return signals at high as well as low aircraft altitudes. In one form of the invention the STC data is used to adjust the gain of a signal applied to a radar system received by a system antenna and in another form of the invention the STC data is used to establish a desired threshold for said signal.Type: GrantFiled: February 26, 1993Date of Patent: May 10, 1994Assignee: AlliedSignal Inc.Inventor: Daryal Kuntman
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Patent number: 5298905Abstract: A lidar apparatus for detecting an object. The lidar apparatus includes a laser providing a visible light output signal over a first field of view and a photodiode having a second field of view. At least some of the first and second fields of view overlap. The photodiode provides electrical signals in response to received optical signals. A controller is coupled to the laser and to the photodiode. The controller for provides electrical signals to the laser, causing emission of visible light output signals. A time varying threshold generator is coupled to the controller. The time varying threshold generator provides a time varying threshold signal in response to signals from the controller. A threshold detector is coupled to the time varying threshold generator and to the photodiode. The threshold detector compares the time varying threshold signal to the electrical signals to provide signals indicating presence or absence of the object.Type: GrantFiled: March 1, 1993Date of Patent: March 29, 1994Assignee: Motorola, Inc.Inventor: Randy L. Dahl
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Patent number: 5293325Abstract: The signal that controls the gain of a sensitivity timing control (STC) circuit is slimmed with a gain correction signal to compensate for gain variations introduced by items such as variations in the parameters of electronic components. A known test signal is injected into the STC circuit and the resulting output signal is measured. The amplitude of the gain correction signal is determined based on the difference between the desired output signal amplitude and the measured output signal amplitude.Type: GrantFiled: November 22, 1991Date of Patent: March 8, 1994Assignee: AlliedSignal Inc.Inventor: Mark G. Roos
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Patent number: 5221928Abstract: An apparatus comprises a signal input and a sampler and analog-to-digital (A/D) converter coupled to the signal input. The sampler and A/D converter forms a digital pre-look signal from an input signal. The apparatus further comprises a digital memory coupled to the sampler and A/D converter. The digital memory stores sensitivity time control (STC) data and provides specific STC data in response to the digital pre-look signal. The apparatus further comprises a digital-to-analog converter coupled to the digital memory. The digital-to-analog converter converts the specific digital STC data to a first analog STC signal. The apparatus also includes a first comparator coupled to the signal input and to the digital-to-analog converter. The first comparator has an input for receiving the first analog STC signal. The first comparator compares a present input signal to the first analog STC signal to provide a detection signal.Type: GrantFiled: June 12, 1992Date of Patent: June 22, 1993Assignee: Motorola, Inc.Inventor: Randy L. Dahl
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Patent number: 5196854Abstract: The present invention is a radar system that corrects for changes in apparent reflectivity and two-way precipitation attenuation using a correction curve that includes a segment for low rain rates, a segment for high rain rates and, if desired, a transition segment for medium rain rates. The signal to noise ratio is further improved by using a sliding azimuth window during post detection integration processing.Type: GrantFiled: June 13, 1991Date of Patent: March 23, 1993Assignee: Westinghouse Electric Corp.Inventor: Bruce D. Mathews
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Patent number: 5115242Abstract: Disclosed is an in-furnace slag level measuring apparatus having a microwave radar for measuring a slag level in a convertor or the like. The level of a transmission signal or a reception signal is adjusted in accordance with the level of a detection signal so that the signal level in the microwave radar is adjusted to be constant. Further, the level measurement value and the detection signal are inputted and the level measurement values obtained in a predetermined time are subjected to averaging operation. In the averaging operation, when the detection signal is smaller than a set point, the averaging operation is performed while disregarding the level measurement value at that time.Type: GrantFiled: March 27, 1991Date of Patent: May 19, 1992Assignee: NKK CorporationInventors: Akio Nagamune, Kouichi Tezuka, Isamu Komine
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Patent number: 5050986Abstract: An optical ranging system includes optics that create a backscatter signal in response to a transmitted light pulse. The transmitted pulse is reflected from a target to provide range information. The backscatter signal is applied to trigger a threshold detector. The output of the threshold circuit is applied to a delay circuit to provide a receiver switch control signal which renders a receiver switch conductive after the backscatter signal. Accordingly, the receiver switch blanks the backscatter signal and applies the reflected signal to the receiver.Type: GrantFiled: June 5, 1990Date of Patent: September 24, 1991Assignee: Motorola, Inc.Inventors: Anthony J. Gatto, Randy L. Dahl, John A. Muir
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Patent number: 4994811Abstract: In a sensitivity time control device for an imaging radar system with an automatic gain control attenuator, a sensitivity time control attenuator and an analog-digital converter, output signals of the analog-digital converter are applied, via a device (20) generating an average value and a comparator device, to a control device, which has a ideal on-off relay connected with a device for determining its control parameter, an integrating member, switched downstream, and a device for calculating the operating point of the automatic gain control attenuator device. Furthermore, an n-bit digital analog converter is switched downstream of the control device, by means of the analog output voltage of which the sensitivity time control attenuator is controlled. It is possible, with the aid of the sensitivity time control device, to evaluate continuously the backscatter signal of an imaging radar system in real time, so that it is continuously possible in this way to determine an optimal sensitivity time control curve.Type: GrantFiled: July 6, 1990Date of Patent: February 19, 1991Assignee: Deutsche Forschungsanstalt fuer Luft - und Raumfahrt e. V.Inventor: Joao Moreira
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Patent number: 4837579Abstract: A pulse marine radar system having a threshold generator providing a range dependent threshold waveform which is a function of sea conditions, rain conditions, and radar parameters. Based on the radar settings and inputs from the operator regarding the sea and rain conditions, a processor uses a mathematical model to compute the mean of sea clutter, rain clutter, and receiver noise for each of a plurality of successive range intervals. In response to the mean values, a generator generates a range dependent piecewise linear analog waveform which is subtracted in range sychronism from the receiver video. Next, the video is filtered. For each range interval, the processor also calculates a threshold based on the probability of sea clutter, rain clutter, and receiver noise exceeding the threshold after subtracting the mean. In response to the threshold values, a generator generates a piecewise analog signal which is compared with the output of the filter to digitize the radar video.Type: GrantFiled: January 27, 1986Date of Patent: June 6, 1989Assignee: Raytheon CompanyInventors: William M. Pease, William M. Hall
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Patent number: 4728953Abstract: A radar system includes a variable delay circuit coupled between the transmitter and the receiver switch. A feedback loop including a comparator and an integrator is coupled between the receiver envelope detector and a control terminal for the variable delay circuit. The feedback loop controls the amount of delay of the receiver switch to maximize sensitivity to close range targets.Type: GrantFiled: October 3, 1986Date of Patent: March 1, 1988Assignee: Motorola, Inc.Inventor: Carl T. Richmond