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8149963 Start-up automatic frequency control (AFC) method and apparatus  
A method and apparatus for use in connection with wireless communication to adjust the frequency of an oscillator to synchronize with a received signal by correlating a synchronization code channel...
7804369 Integrated frequency calibration architecture  
In an exemplary embodiment, a free running VCO has two modes: a normal operating mode and a calibration mode. In the calibration mode, the free running VCO is phase lock looped with itself instead...
7583224 Radar apparatus with automatic local oscillator tuning function  
The portion corresponding to a main bang signal leaking from a transmission/reception switching unit is extracted as a frequency estimation signal from an IF signal from a mixer in a signal...
7551988 Method of software defined radio (SDR) waveform/function management  
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 pro...
7446699 Error corrector for radar timing systems  
A feedback loop corrects timing errors by reducing deviations from a constant radar sweep rate. Errors are detected and fed back to a phase corrector in a high gain feedback system. A precision...
7412013 Start-up automatic frequency control (AFC) method and apparatus  
A method and apparatus for use in connection with wireless communication to adjust the frequency of an oscillator to synchronize with a received signal by correlating a synchronization code channel...
7355484 Oscillator and radar apparatus using the same  
An oscillator and a radar apparatus that includes a resonator electro-magnetically connected to a micro strip line and a rotor connected to the resonator by capacitance. The bottom surface of the...
7340280 Method of configuring base station, and base station  
A base station and a method of configuring a base station are provided in a cellular telecommunication system, wherein the base station comprises an electrically tunable duplex filter with a tuning...
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...
6630903 Programmable power regulator for medium to high power RF amplifiers with variable frequency applications  
A power regulator regulates the power provided to a transistor-based circuit, such as that which might be employed in a high stability MTI radar system. According to the invention, a variable...
6577270 Radar transceiver  
A compact millimeter wave radar transceiver at low cost is provided wherein a direct current voltage applying circuit is coupled to a high frequency line to apply a fast pulse wave without losing a...
6532271 Carrier recovery and doppler frequency estimation  
Method and system for carrier recovery and estimation of Doppler shift from a signal source that is moving relative to a signal receiver. A pure carrier preamble for the received signal is...
6147560 Method and device relating to supervision and control of an oscillator signal  
The present invention relates to methods and devices for such control and supervision of an oscillator signal from a controllable oscillator that is done mainly to control the frequency variation...
6072427 Precision radar timebase using harmonically related offset oscillators  
Two crystal oscillators are configured as a "plug-and-play" precision transmit-receive clock that requires no calibration during manufacture. A first crystal oscillator generates a transmit clock...
6057798 Apparatus and method for frequency modulation  
A method and apparatus for frequency modulating a continuous wave signal is shown to comprise a voltage-controlled oscillator (VCO) having a first and a second control loop to maintain the carrier...
5790068 AFC control switching circuit  
An automatic frequency control loop for maintaining a center carrier freqcy fed to a notch filter for blocking out system reverberation includes, along with the conventional elements found in an...
5751195 Circuit to indicate phase lock in a multimode phase lock loop with anti-jamming security  
A lock detection circuit for a phase lock loop circuit having a phase lock loop circuit, generally a series circuit of a detector, a filter and a VCO with a PLL input terminal and an output...
5694132 Voltage feedback linearizer  
Apparatus for linearizing the sweep frequency output of an FMCW radar employing a voltage controlled oscillator includes means for comparing a series of reference voltages sequentially with the...
5654716 Circuit for short duration multiple look pulse based frequency measurement  
A low cost automatic frequency control system measures short duration radio frequencies with high a degree of accuracy within 0.5 MHz. The system is programmable to allow applicability over a wide...
5497402 Automatic frequency control device for satellite communications ground system  
The present invention relates to an automatic frequency control device and an automatic gain control device which have the advantage of improving the efficiency of a system with very low...
5408239 Method for setting search band widths of a GPS receiver  
In a GPS receiver which searches for a satellite radio wave over a predetermined search bandwidth while setting a search center frequency fs to a start point, an offset value of Δfosc of an ...
5151703 Method and apparatus for improved automatic fequency control  
The frequency of a variable frequency oscillator in a pulsed radar is adjusted using samples of an IF signal. An initial frequency adjustment is made using a sample taken during RF transmission....
5107272 Radar system employing injection locked transmitter stage  
A radar transmitter chain employing injection locked oscillator, e.g., a magnetron, as an output stage. Problems arise with maintaining the injection locking bandwidth centered on the radar source...
4983978 Multi-frequency comb generator for radar and the like  
A multi-frequency comb generator (2-4; FIG. 1) for radar and the like using a feedback loop through a frequency multiplier, such as for example, a doubler (3). A reference or master oscillator...
4982195 Servo control with self calibrating preset  
A frequency input for receiving a frequency signal and digital storing for storing the received frequency signal. A controller has a first and second input and an output. The first input is...
4823133 Radar system  
The invention relates to a radar system comprising a transmitter with a periodically tunable HF-transmitter tube, as a magnetron with rotating tuning body, and a receiver with a mixing stage, in...
4809004 Crystal controlled magnetron  
The invention comprises a weather radar system in which a magnetron transmitter is controlled in frequency by injecting therein a low power locking signal from a stable frequency source. Frequency...
4626856 Radar signal correction system  
A radar correcting system has features for providing a corrected radar receiver reflection to a Doppler process unit. The corrected receiver pulse accounts for variances in phase, amplitude and...
4600924 Automatic frequency control for radar receiver  
A digital automatic frequency control for a pulse-type radar receiver having a voltage controlled local oscillator. A first digital number is generated and converted to a first analog voltage for...
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...
4591859 Radar transmitter  
A radar transmitter is shown to include a voltage-controlled oscillator and associated amplifier to produce a signal to be transmitted with any noise generated within such oscillator and amplifier...
4510622 High sensitivity millimeter-wave measurement apparatus  
A millimeter wave measurement apparatus utilizing a phase-locked transmitter to generate a millimeter wave-signal and a phase-locked local oscillator receiver to receive the transmitted millimeter...
4330760 System for correlating the operating frequencies of two variable-frequency microwave generators  
Two variable-frequency microwave generators, i.e. a coaxial magnetron producing outgoing waves and a voltage-controlled oscillator emitting a heterodyning signal for incoming waves of a radar...
4241345 Pulse radar transmitting oscillator  
An oscillator circuit for use in a pulsed radar transmitter includes a reference oscillator of one frequency of, a voltage controlled oscillator controlled to transmit a radio frequency at a...
4238796 Radio frequency pulse generator  
A radio frequency pulse generator for use in a pulsed radar transmitter includes a reference oscillator of one radio frequency, a second oscillator producing a different second radio frequency...
4228434 Radar receiver local oscillator control circuit  
An improved automatic frequency control arrangement for a missile-borne inverse receiver is shown to include a reference oscillator and a voltage-controlled oscillator with control means for the...
4179694 Frequency control systems  
An AFC system for a radar comprising means for changing in one sense a control voltage fed to a voltage controlled local oscillator forming part of the radar receiver when a predetermined number of...
4159475 VCO-Controlled phase lock system  
A phase coherent canceller for jamming suppression is provided with a variable controlled oscillator which is locked in frequency and phase to a reference local oscillator in a closed loop...
4071844 Frequency control for frequency agile pulse radar  
An automatic frequency control for causing a local oscillator to track the frequency of a transmitter such that the received echo of a transmitted pulse may be combined with the output of the local...
4052722 Traffic radar and apparatus therefor  
Apparatus is provided for determining the frequency of unknown periodic input signals and primarily generally sinusoidal signals which may be accompanied by very substantial noise. More...
4042922 Multi-mode radar system  
A multi-mode radar includes a local oscillator referenced to the radar magnetron and includes logic provided to side step the local oscillator during the latter portion of the radar interpulse...
4023169 Automatic frequency control circuit for frequency agile radar  
An automatic frequency control circuit for frequency agile radar systems. Fundamentally, the invention utilizes two oscillators of different frequencies and which are controlled by the IF pulse...
4023171 Microwave velocity sensor using altimeter echo  
A velocity sensor system comprising a receiver capable of processing the narrow pulse speckle pattern return from a transmitting source in order to determine the velocity of the vehicle in which...
4001825 Pulse radar apparatus  
Pulse radar apparatus provided with a control circuit comprising at least an error voltage generator, a dither-tuned magnetron and a servo unit driving this magnetron, and also with a conditional...
3996588 System for automatic frequency control  
A system for bringing the frequency of an oscillator under the control of the frequency of the carrier of a pulse wherein a parameter characteristic of the carrier frequency value is measured...
3983555 Radar receivers  
A radar receiver for a frequency-agile radar system includes a variable frequency oscillator and an automatic frequency control operable to exert fine control over the frequency generated by the...
3938148 Automatic frequency control system  
An automatic frequency control system that is particularly suited for use th an aircraft launched radar controlled guided missile. The missile automatic frequency control system is made entirely of...
3794771 TIME-SHAPED FREQUENCY TRACKING LOOP  
In a frequency tracking loop, a single voltage-controlled local oscillator produces a sequence of output signals representing the respective peak power frequencies in a recycling sequence of input...
3680099 NON-COHERENT RADAR SYSTEM WITH MEANS TO CORRECT THE PHASE OF THE RETURN SIGNAL  
A pulsed radar including a phase detector connected to detect rf phase variations between transmitted pulses and a stable clock signal for generating an error signal which is fed to a phase shifter...
3611380 DEVICE FOR FREQUENCY CORRECTION IN A RADAR EQUIPMENT  
A device for frequency correction in radar equipment having a tunable transmitting tube with means for continually varying the tuning frequency and triggering the transmitting tube to generate and...
Matches 1 - 50 out of 94 1 2 >