Topic
Crystal oven
About: Crystal oven is a research topic. Over the lifetime, 955 publications have been published within this topic receiving 10380 citations. The topic is also known as: oven-controlled crystal oscillator & OCXO.
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19 Feb 2003
TL;DR: In this article, a software compensation type quartz oscillator was proposed to estimate the true frequency bias of the oscillator after a GPS satellite was locked on, and a polynomial of degree nine was generated to express a frequency drift of the quartz with respect to the temperature.
Abstract: PROBLEM TO BE SOLVED: To provide a software compensation type quartz oscillator. SOLUTION: A navigation satellite receiver has a quartz oscillator depending on a local ambient temperature. A true frequency bias of the quartz oscillator is calculated locally using a receiver after a GPS satellite was locked on. A basis for an atomic clock is established to measure the true frequency by system lock to the GPS satellite. A temperature of quartz is measured, and is recorded to be correlated to bias measurement of the true frequency. A polynomial of degree nine is generated thereafter to express a frequency drift of the quartz with respect to the temperature, using a data therein. Then, the ambient temperature is measured during initialization of the receiver of which the reference oscillator is not locked locally, the polynomial of the degree nine is exponentiated using a result therein to estimate an actual quartz frequency, and a signal is captured from the observable GPS satellite based thereon. COPYRIGHT: (C)2004,JPO
1 citations
TL;DR: The state-of-the-art microwave temperature compensated sapphire-rutile resonator oscillator is reported in this article with a frequency instability of 2.5×10−12/day.
Abstract: Characterisation of a new microwave temperature compensated sapphire-rutile resonator oscillator is reported. The oscillator frequency instability performances are better than 2×10−13 for τ<1000 s, and the frequency drift is estimated at 2.5×10−12/day. These medium- and long-term results constitute, to date, the state-of-the-art for microwave temperature compensated sapphire resonator oscillators.
1 citations
12 Apr 2015
TL;DR: In this paper, a gyroscopic mounting is proposed to install an oscillator on a high dynamic host vehicle to suppress and/or reduce the impact of dynamic loads on its short and medium-term stability.
Abstract: When crystal oscillator applied in high dynamic host vehicle, dynamic loads impact its short and medium-term stability. In order to suppression and/or reduction these impacts, gyroscopic mounting is proposed to install oscillator on it.
1 citations
01 Jan 1984
TL;DR: In this paper, the results of thermionic emission and evaporation studies of single crystal LaB6 cathodes are given, and a comparison between the (100, (210), (210) and (310) crystal planes shows that the (10, 10, 10 A/sq cm) is a work function approx 0.2 eV lower than (100), which translates into a significant increase in current density at specified temperature.
Abstract: The results of thermionic emission and evaporation studies of single crystal LaB6 cathodes are given. A comparison between the (100), (210) and (310) crystal planes shows the (310) and (210) planes to possess a work function approx 0.2 eV lower than (100). This translates into a significant increase in current density, J, at a specified temperature. Comparison with a state-of-the-art impregnated dispenser cathode shows that LaB6 (310) is a superior cathode in nearly all respects except operating temperature at j 10 A/sq cm. The 1600 K thermionic and room temperature retarding potential work functions for LaB6 (310) are 2.42 and 2.50 respectively.
1 citations