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| Number | Title | Issue Date |
| RE40128 | Stabilization in a radar level gauge A radar gauge adapted to sense fluid level in a tank and including a radar gauge circuit in which radar transmission and level sampling are controlled by a transmit frequency and a sample frequency respectively. A first frequency separation between first and second ... | 03/04/2008 |
| 7327308 | Programmable method and test device for generating target for FMCW radar A test device for a frequency modulated continuous wave (FMCW) radar is provided. The test device has a central control unit for monitoring the FMCW radar. When the FMCW radar transmits a frequency modulated continuous signal to search for a target, the central cont... | 02/05/2008 |
| 7315274 | Method and system for determining the position of marine vessels and similar objects A method for determining the relative position between two or more objects in a marine environment, including waterways, of which at least one object can be maneuvered relative to one or more other objects. At least one interrogator is arranged on one or more of the... | 01/01/2008 |
| 7295151 | Systems and methods for self-test of a radar altimeter Systems and methods for testing a signal generated by a Direct Digital Synthesizer (DDS) in a radar altimeter. In an embodiment of the method, a voltage signal derived by comparing a fixed reference frequency to a ramped frequency signal generated by the DDS based o... | 11/13/2007 |
| 7295152 | Timing adjustment method for radar, and radar apparatus having automatic timing adjusting function On/off timing of an amplifier and timing of antenna selection are accurately adjusted. When adjusting the on/off timing of the amplifier, modulation of a transmit signal is stopped, and a switch is set so as not to select any one of the antennas, thereby totally ref... | 11/13/2007 |
| 7064703 | Methods and apparatus for randomly modulating radar altimeters A method for randomly phase modulating a radar altimeter is described. The method includes momentarily applying a signal from a random noise source to an amplifier, applying an output of the amplifier to a voltage controlled oscillator (VCO), applying an output of t... | 06/20/2006 |
| 7009560 | Adaptive variable true time delay beam-forming system and method System and method for signal processing and beam forming. A system for processing signals includes a first phase shifter, a second phase shifter, a first variable time delay system, and a second variable time delay system. Additionally, the system includes a first s... | 03/07/2006 |
| 6972711 | Transmit-receive FM-CW radar apparatus Disclosed is a transmit-receive FM-CW radar apparatus which switches between transmission and reception by time division control, wherein amplifiers capable of controlling gain are provided in a transmitter signal path and a receiver signal path, respectively, and w... | 12/06/2005 |
| 6385266 | Sampling PLL for high resolution radar systems A low-noise sampling PLL for high-resolution radar systems wherein the reference frequencies are taken from a line spectrum (SPK), which has been generated from the mixture of a low quartz oscillator frequency (F1) with a high quartz oscillator frequency ... | 05/07/2002 |
| 6097331 | FM-CW radar system for measuring distance to and relative speed of target An FM-CW radar apparatus is provided which may be employed in automotive anti-collision or radar cruise control systems. The radar apparatus transmits as a radar wave a high-frequency signal which is so modulated in frequency with a modulating signal as t... | 08/01/2000 |
| 5717399 | Radar device for vehicle use A radar device for vehicle use which can be manufactured inexpensively while enhancing its monitoring function for an adjacent object as well as a remote object. The radar device includes a radar module for monitoring an adjacent object having a plurality... | 02/10/1998 |
| 5619208 | FM-CW radar system In an FM-CW radar system, a beat signal is frequency-analyzed for selecting ascending-side beat frequencies and descending-side beat frequencies for a plurality of targets. By pairing the ascending-side and descending-side beat frequencies one by one from... | 04/08/1997 |
| 5016016 | Volume-scattered echo discrimination device for FM/CW range measuring radar and use in a radio altimeter The device comprises, in a control loop of the subtractive beat frequency fb between transmitted waves and waves received as an echo, a pursuit discriminator (11) establishing the frequency fb at f0 and a pursuit validation circuit (12). This d... | 05/14/1991 |
| 4812035 | AM-FM laser radar A laser radar system wherein a beam of continuous wave (CW) electromagnetic energy is generated with frequency modulation (FM) and amplitude modulation (AM) being imposed thereon to produce an amplitude and frequency modulated, continuous wave beam of ene... | 03/14/1989 |
| 4665401 | Millimeter wave length guidance system A high frequency target seeking device, using a stabilized reflector antenna, performs range search and tracking functions and target angle search and tracking functions. A technique is provided for target range discrimination using several narrow band i.... | 05/12/1987 |
| 4599618 | Nearest return tracking in an FMCW system An FMCW distance measuring device is disclosed which provides nearest return tracking for increased accuracy. A portion of the transmitted wave in an FMCW altimeter is mixed with a received signal indicating distance to a target to produce a beat frequenc... | 07/08/1986 |
| 4568938 | Radar altimeter nearest return tracking An FMCW distance measuring device is disclosed which enables increased accuracy by detecting the nearest return. A portion of the transmitted wave in an FMCW altimeter is mixed with the received signal indicating distance to ground to produce a beat frequ... | 02/04/1986 |
| 4509049 | FMCW system for providing search-while-track functions and altitude rate determination An FMCW distance measuring system is disclosed which provides a search and track function for enabling searching for nearer returns during altitude tracking, and for more accurately determining altitude rate. A portion of the transmitted wave in an FMCW a... | 04/02/1985 |
| 4503433 | Range measurement by means of frequency modulated continuous wave radar A continuous wave FM range measuring apparatus for transmitting a signal F which is linearly modulated by a sawtooth signal over a frequency excursion ƊF during a duration T and which has a central frequency f1. A phase loop is provided for st... | 03/05/1985 |
| 4464662 | Determining azimuth of a transponder by measuring a plurality of phase shifts A method for determining the azimuth of a transponder relative to a radar system which transmits a frequency F varying linearly with time. The system comprises two receiving antennas disposed at a distance d from each other and produces two beat s... | 08/07/1984 |
| 4367473 | Distance measuring equipment utilizing frequency modulation A radio distance measuring equipment emits a frequency modulated carrier wave signal, having a periodic frequency deviation ƊF and a mean frequency Fo, toward an object, and receives a portion of the carrier wave signal reflected by the object... | 01/04/1983 |
| 4302758 | Radar system for determining range and speed of an object A system for determining the range H to an object and the relative velocity v of the object, including means for generating first and second high-frequency signals, transmitting, receiving and mixing the received high-frequency signal with the high-freque... | 11/24/1981 |
| 4276549 | FM-CW Radar distance measuring apparatus A FM-CW radar distance measuring apparatus, comprising a feedback loop having a high-frequency signal generator, a mixer device producing a beat signal between the transmitted wave and the received wave, a frequency discriminator, an integrator and a modu... | 06/30/1981 |
| 4205314 | Device for measuring the range of a moving target and the speed at which it approaches or recedes A radio range measuring apparatus having a controlled modulation slope in order to keep the beat frequency between the transmitted signal and the received signal constant. The apparatus also measures the speed at which a mobile target approaches or recede... | 05/27/1980 |
| 4107679 | Frequency modulator for high-precision range measurements A range measuring apparatus of the linear frequency modulation type is disclosed which comprises a measuring control loop for rendering the beat frequency between the transmitted and received frequencies equal to a fixed frequency. The apparatus further i... | 08/15/1978 |
