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Frequency drift

About: Frequency drift is a research topic. Over the lifetime, 5054 publications have been published within this topic receiving 56191 citations. The topic is also known as: chirp rate.


Papers
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Journal ArticleDOI
TL;DR: In this article, the results of an autodyne oscillator with linear frequency modulation following the antisymmetric and symmetric saw-tooth function are presented, with the oscillator being affected by its own reflected radiation.
Abstract: General equations are obtained for the autodyne response in the case of an arbitrary frequency modulation both over the active element bias circuit and voltage variation on the voltage-dependent capacitor (varicap). The results of investigation of an autodyne oscillator with linear frequency modulation following the antisymmetric and symmetric saw-tooth function are presented, with the oscillator being affected by its own reflected radiation. Special features of self-oscillations of such autodynes are considered, with the aim to improve their characteristics and extend the functional capabilities of short-range autodyne radars. The experimental results obtained for the TIGEL 08FM oscillator module manufactured using a hybrid-integral technology on the basis of a mm-range Gunn diode are reported.

16 citations

Proceedings ArticleDOI
04 May 2003
TL;DR: An overview of the hardware design and control strategy for converting the output of a free-running ovened quartz oscillator (OCXO) to the desired standard frequency output by reference to GPS is given.
Abstract: The global positioning system can be used to provide a precise time and frequency reference to control local oscillators. The local oscillator is necessary to provide holdover of time and frequency in the absence of GPS and to average short-term jitter in the GPS signal recovered by the receiver. This paper gives an overview of the hardware design and control strategy for converting the output of a free-running ovened quartz oscillator (OCXO) to the desired standard frequency output by reference to GPS. The method enables the use of a very low aging fifth overtone quartz oscillator, to which final plating of the crystal to trim 'on frequency' is omitted. Sufficient frequency control could not normally be applied to this very stable oscillator by the conventional method of varactor tuning. A compact implementation is achieved with very low spurious frequency content and low phase-noise of the standard frequency output. Performance data is presented.

16 citations

Proceedings ArticleDOI
01 May 2016
TL;DR: Frequency synthesizer consists of a voltage controlled oscillator (VCO) and a Phase-locked loop (PLL) and can be achieved by using a direct digital synthesizer (DDS).
Abstract: Frequency synthesizer consists of a voltage controlled oscillator (VCO) and a Phase-locked loop (PLL). Finer frequency synthesis can be achieved by using a direct digital synthesizer (DDS). The PLL accepts an input of 10MHz which is known as the reference frequency and up converts it to an intermediate frequency of 1 GHz, which acts as an input to the direct digital synthesizer (DDS). The DDS can produce an output ranging from 1 Hz to 400 MHz. Here we are generating a frequency of range 360 ± 5 MHz. The final output frequency of the entire system belongs to C Band of Microwaves which is used in Doppler Weather Radar.

16 citations

Journal ArticleDOI
TL;DR: In this article, the authors investigated the impact of thermal effects on the frequency switching and frequency-shift keying (FSK) of a tunable laser in the presence of red-shifted thermal effects.
Abstract: The continuous growth of telecommunications traffic has placed huge demands on the traditional networks. Bottlenecks are particularly evident at the routers, where optical to electrical conversion must take place to read the routing information. Using optical-only routing, the traffic flow would be much faster, and more streamlined. A key component in this optical router is the tunable laser. When the laser is switched at high speeds, red-shifted thermal effects, due to the heating effects of the applied currents, cause a drift in the frequency, in the opposite direction to the blue-shifted carrier effects. The thermal effects have been quantified theoretically and experimentally here. The impact of the thermal effects, both on the frequency switching and on the frequency-shift keying (FSK), has been investigated. Methods of compensating for the thermal effects have been developed and verified by simulation and by experiment.

16 citations

Patent
01 Jul 1988
TL;DR: In this paper, a digitally temperature compensated oscillator has an oscillator for producing a frequency signal, a regulator for regulating the frequency of the frequency signal and a detector for detecting ambient temperature and producing a corresponding temperature signal.
Abstract: A digitally temperature-compensated oscillator has an oscillator for producing a frequency signal, a regulator for regulating the frequency of the frequency signal, and a detector for detecting ambient temperature and producing a corresponding temperature signal. A processor processes the temperature signal with reference to the frequency signal to produce processed temperature data. A memory stores compensation data effective to regulate the frequency of the frequency signal. A controller operates according to the temperature data to retrieve corresponding compensation data from the memory for controlling the regulator according to the retrieved compensation data to regulate the frequency of the frequency signal.

16 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20237
202217
202150
202059
201963
201887