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7612706 |
Monopulse radar apparatus and antenna switch
An antenna unit includes at least one transmission antenna and plural reception antennas. A receiver detects information including azimuth information for a target, based on an output from the...
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7541972 |
RF attenuation circuit
An RF receiving circuit that selectively attenuates a received RF signal before it reaches sensitive modifying devices, such as a low noise amplifier or an analog to digital converter. The...
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7475273 |
Hybrid parallel/serial bus interface
A hybrid serial/parallel bus interface has a data block demultiplexing device. The data block demultiplexing device has an input configured to receive a data block and demultiplexes the data block...
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7463187 |
Method and system of improving altimeter accuracy by use of a separate peak return signal tracking
A method to control a track gate and a level gate in an altimeter tracking an altitude of an airborne vehicle comprising emitting signals, directed toward a terrain, from the airborne vehicle,...
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7426250 |
Automatic gain controller and controlling method thereof
An automatic gain controller and the controlling method thereof are disclosed. The automatic gain controller includes a first multiplexer for receiving an input signal and a gain and generating a...
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7420503 |
Small-sized low-power dissipation short-range radar that can arbitrarily change delay time between transmission and reception with high time resolution and method of controlling the same
In a configuration according to a short-range radar of the present invention and a method of controlling the same, the timing at which a variable-period pulse output from a variable-period pulse...
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7411535 |
D/A conversion circuit and semiconductor device
A D/A conversion circuit in accordance with the present invention, which is provided with a switch swD, allows a writing operation of a voltage (a true gradation voltage) to be performed at a...
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7397419 |
Radar apparatus and failure detection method thereof
The present invention provides a radar apparatus, which can diagnose failure at low cost with high accuracy, and a failure diagnosis method thereof. An antenna serves as both a transmit antenna and...
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7336220 |
Method and apparatus for equalizing broadband chirped signal
In order to generate a signal for canceling a chirped signal, a transmitter generates a cancellation signal along with the transmitted signal, using a single term variable complex gain multiplier...
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7330149 |
Method for locating multiple angle sources using a monopulse radar
A monopulse radar tracking method which analyzes boresight error information provided a monopulse radar to determine a location for two targets. The monopulse radar tracking method analyzes the...
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7298317 |
Gain compensation in an ultra-wideband transceiver
A circuit for providing gain compensation to a swept frequency response in an ultra-wideband system includes using a variable amplitude IF signal into a gigahertz mixer to control the amplitude of...
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7274322 |
Systems and methods for automatic gain control for multichannel receivers
Apparatus and methods for performing automatic gain control in a radar system. One embodiment of the system includes an attenuator that controls gain of signals received from a radar receiver. A...
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7248205 |
Radar apparatus
A transmitter emits into an intended search space a radar wave having a predetermined frequency pulse-modulated by a trigger pulse of a predetermined width. A receiver receives a reflected wave of...
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7199751 |
Radar equipment
A radar equipment of the present invention amplifies a reception signal with feedback based on the delay amount obtained from the correlation detection result. Accordingly, it becomes possible to...
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7149263 |
AGC method and circuit for digital radio receiver
A gain of an amplifier of a receiver is automatically controlled based on a level of a signal received by the receiver. The instantaneous value of the envelope of the received signal is detected...
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7098843 |
Automatic sensitivity control for radar level gauges
A radar level gauge system for determining the filling level of a filling material in a tank is disclosed. The system comprises an antenna device for emitting measuring signals towards the surface...
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7084806 |
Intruding object detecting apparatus, and setting apparatus, setting process and setting confirmation process therefor
Provided are an intruding object detecting apparatus (a radio wave sensor) capable of setting an arbitrary detection region, an apparatus for setting the detection region and a setting processe. An...
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7075478 |
Radar altimeter having an automatically calibrated sensitivity range control function
A radar altimeter for an air vehicle is described. The radar altimeter includes a transmit antenna configured to transmit radar signals toward the ground, a receive antenna configured to receive...
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6903679 |
Video amplifier for a radar receiver
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...
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6894641 |
Radar system mounted on vehicle
To provide a radar system mounted on a vehicle that reliably detects the reception of the interference wave with high-performance and inexpensively. There is provided a radar system mounted on a...
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6882684 |
Automatic gain control circuit, data communication device and automatic gain control method
An automatic gain control circuit includes a first portion which calculates a first error amount, and a second portion which calculates a second error amount. Both calculated error amount is sent...
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6879281 |
Pulse radar detection system
A radar based sensor detection system comprises a microwave source operative to provide a continuous wave signal at an output. A pulse-former is coupled to the output of the source and is operative...
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6862327 |
AGC circuit
An automatic gain control (AGC) circuit includes a digitally-controlled amplifier having a gain control loop including a level detector, a threshold circuit and a digital gain control signal...
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6844843 |
Signal processing apparatus of radio radar
A signal from CW radar is received, and the received power detected by the CW radar's swinging in all directions is averaged in each direction. Then, the maximum value and the minimum value of the...
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6762709 |
Radar system, method of obtaining image, control method based on image data and monitoring method using milliwaves
A plurality of sub-antennas in a two-dimensional plane antenna 11 or the like receive milliwaves from concerned object 20 . An A/D converter 12 converts the received signal to digital data. A...
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6741203 |
Adaptive radar thresholds system and method
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...
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6677886 |
Weather and airborne clutter suppression using a cluster shape classifier
A method of determining the presence of a weather or other airborne (non-aircraft) clutter in a radar detection system is disclosed. The method includes feature calculations of a cluster of...
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6674390 |
Shipboard point defense system and elements therefor
A pulse Doppler radar receiver is disclosed wherein monopulse sum and difference signals are time-multiplexed and passed through a single gain-controlled amplifier channel for normalization, the...
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6665056 |
Method and apparatus for measuring distance to a detection object
A method and apparatus of measuring a distance to a reflection object is disclosed. A sensitivity time control (STC) process is applied to a received signal from the reflection object to provide an...
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6593874 |
Radar for detecting the distance to a target
In a radar, a frequency-modulated transmission signal whose frequency varies in time is generated. The gain-frequency characteristics of an IF signal which represents a beat signal between the...
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6594000 |
Automatic gain control system for use with multiple wavelength signal detector
The present invention is an automatic gain control system for use with a multiple wavelength laser LIDAR system that transmits sets of time-separated interrogating signals to generate sets of...
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6549158 |
Shipboard point defense system and elements therefor
A combined defense and navigational system on a naval Vessel is disclosed. The disclosed system includes a track-while-scan pulse radar which is controlled to provide either navigational...
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6496017 |
Measuring antenna signal strength with automatic gain control receiver
Apparatus and method for measuring an antenna signal strength (X). The apparatus includes a first amplifier section ( 3 ) for receiving an antenna signal and having a first automatic gain control...
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6363343 |
Automatic gain control
A gain control circuit for a telephone, the circuit comprising a signal strength calculator for calculating the strength of a signal; a gain controller adapted to modify the strength of the signal...
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6266004 |
Radar method used in a motor vehicle
The invention relates to a radar method for an automatic intelligent traffic control (AICC) in a motor vehicle. The use of a frequency modulation continuous wave method (FM-CM) is suggested in...
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6218981 |
Radar device for vehicle
A radar device for vehicle comprising a means for transmitting electromagnetic waves, a means for receiving the electromagnetic waves reflected by a target object, a signal processing means for...
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6191725 |
Automatic gain control for digital radar intercept receivers
An automatic gain control (AGC) circuit for electromagnetic wave receiving systems, such as radar warning receivers, has a number of N parallel paths to which analog IF input signals are applied...
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6188349 |
Frequency adjusting arrangement
A frequency adjusting arrangement is disclosed whereby the frequency of a local oscillator, incorporating an Yttrium-Iron-Garnet filter as the frequency determining element, is controlled to follow...
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6094159 |
Process for measuring distance with adaptive amplification
A process for determining the distance between a distance sensor and an object, wherein an analog input signal is directed to a transmitter of the distance sensor. The transmitter emits a wave...
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5933112 |
Antenna array receiver and a method of correcting a phase shift amount of a receiving signal
First and second phase control amount tables output to first and second vector multiply circuits phase control signals Sc1 and Sc2 representative of corresponding phase shift amounts with gains...
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5905459 |
Methods and apparatus for stabilizing radar false alarm rate
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...
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5896103 |
Method and aparatus for dynamically calibrating a radar receiver
A wave-based detection system according to various aspects of the present invention analyzes signals in conjunction with a series of thresholds related to the anticipated input power of the...
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5687195 |
Digital automatic gain controller for satellite transponder
A digital automatic gain controller for a satellite transponder, comprising an amplification circuit for amplifying a radio frequency signal detected by a detector diode by a difference between the...
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5652594 |
Signal processor affording improved immunity to medium anomalies and interference in remote object detection system
A signal processor is described for object detection systems such as radar and sonar systems in which wave energy is transmitted and received as a train of discrete pulses of frequencies stepped in...
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5572215 |
Digital data processor
A plurality of threshold detectors is provided to pass analog signals of predetermined and varying threshold values. An analog to digital converter converts these analog signals to binary 1s and...
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5422648 |
Receiving antenna apparatus for broadcast by satellite
A receiving antenna apparatus for receiving broadcast by satellite and adapted for mounting on a mobile body in which radio wave interruption tends to occur by obstacles, attains high-speed...
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5347284 |
System and method for a digital navigation satellite receiver
There is disclosed a global positioning system receiver method and system which converts the analog signals to digital signals prior to performing signal acquisition and GPS unique processing...
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5334969 |
Vehicle security system with controller proximity sensor
A car security system has a proximity sensor such as a radar sensor with variable sensitivity and capable of producing a detection signal upon detecting motion of a person in a monitoring area. A...
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5293325 |
Apparatus and method for compensating a radar's sensitivity timing control circuit
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...
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5280289 |
Automatic signal thresholding system
An automatic thresholding target detection system operable in high clutter, noisy environments provides target recognition through the generation of automatic signal thresholds. Infrared and radar...
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