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7567202 |
Radar system
Embodiments of the invention are concerned with a radar system, and relates specifically to scanning radar systems that are suitable for detecting and monitoring ground-based targets. In one...
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7548188 |
Precision radio frequency delay device
A method of delaying propagation of a radio frequency (RF) signal through a circuit is described. The method comprises receiving data that represents a delay time interval, providing an RF signal...
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7519113 |
Noise detection device
Noise detection is performed by using the output of the phase comparator that the PLL comprises. The phase comparator outputs a signal that is based on the phase difference between the output of...
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7421053 |
Fast clock acquisition enable method using phase stir injection to PLL for burst mode optical receivers
Systems and methods for aligning the phase of a PLL with an incoming data signal. In one embodiment, when a data signal is received in a PLL, a phase perturbation signal is generated and injected...
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7391359 |
Mode S transponder transmission signal decoder and Mode S transponder transmission signal decoding method
There are provided a differential processing unit which performs differential processing for a Mode S transponder transmission signal, an auto correlation arithmetic operation unit which performs...
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7345620 |
Method and device for the adaptive regulation of power
A method and a device for adaptively controlling power in a radar device having a radar transmitter and a radar receiver are provided, in particular for applications in vehicles. The radar signals...
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7342986 |
Digital PLL device
A phase-locked-loop device includes a clock generator for generating a reference clock based on a binarized playback signal and a frequency of run-length data and for generating N-phase clocks...
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7298313 |
Radar-compatible data link system (U)
The invention provides a radar system capable of transmitting data communications concurrently with and on a non-interfering basis with the normal radar functions. A continuous-wave carrier...
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7274323 |
Remote phase synchronization using a low-bandwidth timing referencer
A method and apparatus for synchronized clocking between a radar receiver and a radar transmitter includes sharing a reference signal between the transmitter and receiver, dividing the common...
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7239266 |
Radar altimeter
The present invention provides a radar altimeter system with a closed loop modulation for generating more accurate radar altimeter values. The system includes an antenna, a circulator, a receiver,...
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7151476 |
Radar system having a beamless emission signature
A radar system having a beamless emission signature is described. In one implementation, the radar system includes a transmission system and a receiver system. The transmission system is configured...
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7133324 |
Synchronous dynamic random access memory devices having dual data rate 1 (DDR1) and DDR2 modes of operation and methods of operating same
A dual data rate dynamic random access memory (DDR DRAM) device may operate in dual DDR modes via a mode selection circuit configured to enable a Dual Data Rate (DDR) 1 mode of operation for the...
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7019684 |
Phase lock loop circuitry
An arrangement for reducing the effect of vibration-induced changes in phase of the first local oscillator in a tracking receiver wherein final detection is accomplished by a synchronous detector...
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6636979 |
System for measuring phase error between two clocks by using a plurality of phase latches with different respective delays
A phase error measurement circuit for measuring phase error between two clocks on an integrated circuit is provided. The measurement circuit includes first and second clock signal inputs, a phase...
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6486826 |
Arrangement for the precise distance measuring, in particular the filling level measuring
An arrangement for the precise measuring of the distance with a FMCW radar device having a frequency-variable digitally-actuated oscillator to generate a transmitting frequency which can be tuned...
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6204802 |
Apparatus for detecting relative velocity
In order to produce relative velocity signals in accordance with the relative velocity between a following and a preceding vehicle, a Doppler signal transmitter, which targets the preceding...
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6114987 |
Dual-loop linearizer for FM-CW radar
A system and method for generating a linear frequency sweep while also improving the phase noise characteristics of a microwave or millimeter wave signal source. The invention uses two phase lock...
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6081224 |
High accuracy, low speed doppler effect radar and signal conditioning circuit useful in agricultural applications
A control system for a mobile planting apparatus which permits discrete plant spacing to be determined and maintained independent of wheel rotation on the planting apparatus having: (1) a ground...
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5914683 |
Ultra high resolution ranging unit
A low cost, real time, remote sensor device for accurately measuring distance to an object with a resolution of 1 millimeter or better using phase information from either electromagnetic or...
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5745442 |
Digital time interval measurement engine for a time of flight system
An exclusively digital timing engine that measures extremely short time intervals for use in time of flight systems such as laser range finding systems. This exclusively digital timing engine...
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5614910 |
Miss distance vector scoring system
A miss distance scoring system comprising four antennas which are configu to provide for an optimal radiation pattern of pulsed radio frequency energy to determine a missile's miss distance and...
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5453748 |
Method and apparatus for responding to an interrogation signal
A transponder receives a stable reference frequency transmitted from an interrogator and compares the stable reference frequency to a local oscillator frequency that has short term stability. A...
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5430537 |
Light beam distance encoder
A light beam encoder for measuring absolute distance over a linear path with an accuracy of at least that provided by incremental optical encoders, but over longer ranges than can readily be...
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5400034 |
Digital phase lock detector
A digital phase lock detector for determining the periods of an incoming signal for use in measuring rapidly and accurately the relative speed or velocity of vehicles according to the Doppler-radar...
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5317320 |
Multiple radar interference suppressor
A multiple radar interference suppressor for use in a missile scoring system. The multiple radar interference suppressor phase locks the pulse repetition frequency of each drone (unmanned) aircraft...
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5311190 |
Transmit and receive antenna element with feedback
A transmit/receive element having a transmit/receive circuit that includes a variable frequency transmit phase lock loop and a variable frequency receive phase lock loop, and an output amplifier...
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5307071 |
Low noise frequency synthesizer using half integer dividers and analog gain compensation
A low noise frequency synthesizer 10 that uses uses frequency dividers 13, 15, at least one of which(divider 15) is incrementable and decrementable in half integer steps, and analog gain...
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5298904 |
Distance measuring system
A distance measuring system which may be used on a golf course in order for a golfer to accurately measure the distance between the present lie of his golf ball and the hole toward which he is...
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5291206 |
Multiple target discrimination system
A radar homing system in a guided missile for intercepting one of a group of targets, such as aircraft flying in formation. Offset circuitry places undesired Doppler target returns outside of the...
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5221062 |
Frequency synthesizer
A frequency synthesizer (100) for use in combination with the transmitter (30) for transmitting guidance information to one or more ground launched active radar guided missiles simultaneously which...
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5125736 |
Optical range finder
An optical range finder includes two detectors for minimizing frequency dispersion affects of the detectors on the system. The optical range finder is calibrated by locking a voltage controlled...
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5063387 |
Doppler frequency compensation circuit
In a communications data link network of the type having a plurality of ground stations and a single moving airborne station, there is provided a doppler frequency compensation circuit in each of...
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5034748 |
Narrow band automatic phase control tracking circuitry
The invention disclosed herein relates in general to an improved circuitry or narrow band frequency tracking system for doppler radar and includes third order phase lock loop circuitry to improve...
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4806934 |
Tracking circuit for following objects through antenna nulls
A circuit for removing abrupt phase changes in a received signal, such as those caused when an object tracking system's directional receiving antenna becomes misaligned with the tracked object. The...
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4788547 |
Static-split tracking radar systems
A static-split tracking radar system with substantially improved performance. The system includes parallel signal processing channels for processing sum and difference signals from a target-seeking...
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4724437 |
Signal acquisition circuit with variable bandwidth phase locked loop
A signal acquisition circuit for a missile guidance system has a phase lock loop which is responsive to incoming signals received from a target and will lock on to the frequency of the received...
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4672330 |
Phase-lock loop systems
A phase-lock loop system with particular use in radar tracking systems is disclosed. From a number of input signals of varying frequencies such as a carrier frequency and several side band...
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4626857 |
Dual frequency band radar detector
A dual frequency band radar detector responds to radar signals occurring within either of a first or a second range of frequencies. The detector comprises one or more antennas for receiving radar...
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4616191 |
Multifrequency microwave source
A frequency-agile source of microwave frequency signals is shown to include: a voltage-controlled oscillator operating within a band of microwave frequencies; a crystal-controlled oscillator...
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4600889 |
Coherent oscillator
A coherent oscillator circuit which samples a signal responsive to phase and frequency of a transmitted pulse of radio frequency energy in an acquisition mode, and regenerates a signal...
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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...
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4595927 |
Loran C cycle slip reduction technique
In accordance with the present invention, there is provided a Loran C cycle slip reduction technique that consists of sensing the signal to noise ratio and narrowing the phase locked loop bandwidth...
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4551725 |
System for identification and determination of the moment of passage of a multiple number of moving bodies at a given point on their path
The system comprises a mobile device mounted (2) on each moving body, a fixed receiving antenna (3) and means for processing (4) the identification signals emitted by the mobile devices (2). The...
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4510463 |
Automatic gain controlled frequency discriminator for use in a phase locked loop
A frequency discriminator having a wide capture band is shown to comprise, in addition to a conventional phase detector having two channels fed by a signal whose frequency is to be determined (the...
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RE31851 |
Signal processing system
An improved system for processing an electrical velocity information signal in a velocity detecting system in which a detector is utilized for developing an electrical information signal, such as a...
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4506264 |
Frequency translator
A frequency down-converter down converts an input signal having a frequency in a given bandwidth and a frequency up-converter up converts the down converted input signal and imparts a doppler shift...
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4503401 |
Wideband phase locked loop tracking oscillator for radio altimeter
A wideband phase locked loop oscillator (PLLO) for tracking the frequency of an altitude signal in an FM/CW type radio altimeter. The phase locked loop oscillator conventionally includes a voltage...
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4429309 |
Tracking filter system for use with a FM/CW radar
A tracking filter system including a phase locked loop and a tracking filter is receptive of an input signal of frequency A and undesired frequency X from a signal source such as a frequency...
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4427981 |
Tracking filter for radio altimeter
A filter for tracking the ground signal return in an FM/CW radio altimeter. The filter has a variable band pass frequency response which is adjusted as a function of the altitude measured by the...
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4396916 |
Pseudonoise radar
A continuous wave pseudonoise radar system which employs a large word rate to avoid spillover and other noise. Spillover is the electromagnetic energy that is transmitted from the transmitting...
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