Including An Alternating Reference Path Patents (Class 356/5.12)
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Patent number: 9784833Abstract: Systems and techniques are described that provide automated parking assistance for a vehicle. In some implementations, a parking assistance apparatus includes a frequency generator configured to generate a first frequency and a second frequency, and generate at least one synthesized frequency that is synthesized from the first frequency and the second frequency. The apparatus also includes a piezoelectric converter configured to, using piezoelectric effects, transmit ultrasonic waves having the at least one synthesized frequency, and receive reflected ultrasonic waves that result from the transmitted ultrasonic waves being reflected by an object. The apparatus also includes a filter unit configured to detect a predetermined frequency from the reflected ultrasonic waves.Type: GrantFiled: September 23, 2015Date of Patent: October 10, 2017Assignee: LG Electronics Inc.Inventors: Sungmin Kim, Byeongrim Jo, Juhnho Park
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Patent number: 8010316Abstract: A system and method is described for determining a distance to a desired target via correlating a pulse modulated signal with its corresponding reflected signal, while compensating for noise error in the reflected signal to allow for a more precise distance determination. The system and method determine a phase shift of an echoed signal in response to a transmitted signal incident onto an object to thereby determine a distance, wherein the system analyzes an overlap region between a second signal that is a reflection of a first signal incident on the object. The first signal is modulated by one or more pulses having a defined modulation frequency. Further details and features are described herein.Type: GrantFiled: December 11, 2008Date of Patent: August 30, 2011Assignee: Intermec IP Corp.Inventor: Paul A. Maltseff
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Patent number: 7948612Abstract: A measurement system 1 for measuring a distance to an object to be measured, includes: a half mirror 10; a measurement light emitting unit 11; a projection unit 12; a light-receiving unit 13; a distance calculation unit 14; and a diffusion lens 16.Type: GrantFiled: September 9, 2008Date of Patent: May 24, 2011Assignees: Honda Motor Co., Ltd., Alnair Laboratories CorporationInventors: Masakatsu Kaneko, Sze Yun Set, Chee Seong Goh, Morisato Namikawa, Yuichi Nagashima, Tomoharu Kotake, Hiroshi Yaguchi
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Patent number: 7450220Abstract: TOF system shutter time needed to acquire image data in a time-of-flight (TOF) system that acquires consecutive images is reduced, thus decreasing the time in which relative motion can occur. In one embodiment, pixel detectors are clocked with multi-phase signals and integration of the four signals occurs simultaneously to yield four phase measurements from four pixel detectors within a single shutter time unit. In another embodiment, phase measurement time is reduced by a factor (1/k) by providing super pixels whose collection region is increased by a factor âkâ relative to a normal pixel detector. Each super pixel is coupled to k storage units and four-phase sequential signals. Alternatively, each pixel detector can have k collector regions, k storage units, and share common clock circuitry that generates four-phase signals. Various embodiments can reduce the mal-effects of clock signal transients upon signals, and can be dynamically reconfigured as required.Type: GrantFiled: October 16, 2007Date of Patent: November 11, 2008Assignee: Canesta, IncInventors: Patrick O'Connor, Ilhami Torunoglu, Rajeev Nagabhirana
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Patent number: 7336346Abstract: A distance measuring device is provided that reduces the time required for a distance measurement without degrading accuracy of the measured value.Type: GrantFiled: May 17, 2006Date of Patent: February 26, 2008Assignee: Sokkia Co., Ltd.Inventors: Akihiro Aoki, Yutaka Nakamura, Koji Sasaki, Toshihiro Uchimura, Futoshi Osada, Hayami Kikawa
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Patent number: 7075626Abstract: The invention is based on a laser range finder that has a transmitter unit (10) with at least one laser, a receiver unit (12), and a single sideband modulation unit (14) that can use a first single sideband modulation frequency (ZF1) generated by an oscillator unit (16) and a carrier frequency (T1) to generate a modulation frequency (S1) of the transmitter unit (10). According to the invention, the oscillator unit (16) can generate at least one additional frequency (ZF2) and the single sideband modulation unit (14) can use the additional frequency (ZF2) to generate a demodulation frequency (S2) of the receiver unit (12).Type: GrantFiled: December 5, 2002Date of Patent: July 11, 2006Assignee: Robert Bosch GmbHInventors: Dierk Schmidt, Joerg Stierle, Peter Wolf
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Patent number: 6586748Abstract: A method and system are provided for measuring water current direction and magnitude. A plurality of beams of radiation are transmitted radially outward from a location above a body of water. Each beam is incident on the water's surface at an angle with respect thereto. Each beam experiences a Doppler shift as a result of being incident on the water's surface such that a plurality of Doppler shifts are generated. Each Doppler shift is measured with the largest one thereof being indicative of water current direction and magnitude.Type: GrantFiled: June 6, 2000Date of Patent: July 1, 2003Assignee: The United States of America as represented by the Secretary of the NavyInventors: Jack Lloyd, Lyles Adair, William Stachnik
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Patent number: 6369880Abstract: A device for distance measurement using a semiconductor laser in the visible wavelength range, which functions according to the echo time method, includes a collimation objective for bundling the transmitted measuring beam bundle, a circuit arrangement for modulating the measuring beam, a receiving objective for receiving and imaging the measuring beam bundle reflected at the distant object onto a receiving device, and an evaluation device for determining and displaying the distance measured to the object. The circuit arrangement for modulating the measuring beam and the evaluation device can be switched between two different operating modes. In the first operating mode, the modulation takes place using a first frequency and in the second operating mode using a second frequency. These frequencies stand in a whole-member ratio to each other.Type: GrantFiled: October 12, 2000Date of Patent: April 9, 2002Assignee: Robert Bosch GmbHInventor: Siegbert Steinlechner