A Passive Rubidium Atomic Frequency Standard

Abstract

The invention relates to the technical field of atomic frequency standards, in particular to a passive rubidium atomic frequency standard. It includes a user terminal module, an integrated module, and a voltage-controlled crystal oscillator, an isolation amplifier, a radio frequency multiplier module, a microwave frequency multiplier module, a physical unit, and a servo circuit that are electrically connected in sequence. The servo circuit includes a shaping circuit module, a phase detection module, and a servo circuit that are electrically connected in sequence. Integral circuit, analog-to-digital converter and data processing module, the AC signal output end of the physical unit and the comprehensive module are electrically connected to the input end of the shaping circuit module, the output end of the data processing module and the output end of the radio frequency multiplication module are connected to the user terminal module electrical connection. The servo circuit inputs the frequency stability of the frequency standard to the user terminal module, which is convenient for the user to understand the working state stability of the frequency standard. In addition, the integrated module uses a direct digital frequency synthesizer to replace the traditional varactor diode modulation circuit, which is not affected by temperature, so that the atomic frequency standard has a high degree of stability.

Description

technical field [0001] The invention relates to the technical field of atomic frequency standards, in particular to a passive rubidium atomic frequency standard. Background technique [0002] The traditional passive rubidium atomic frequency standard is composed of physical unit and electronic circuit. The physical unit includes spectral lamp, integrated filter resonant bubble, microwave cavity, photodetector, C field, magnetic screen, etc.; electronic circuit includes Comprehensive modules, voltage-controlled crystal oscillators, isolation amplifiers, radio frequency multiplier modules, microwave frequency multiplier modules, and servo circuits, etc. The physical system provides the quantum frequency discrimination reference, and the electronic circuit provides the microwave interrogation signal and frequency locking function, which locks the output frequency of the voltage-controlled crystal oscillator on the atomic absorption peak of the physical system. [0003] Atomic ...

AI Technical Summary

Problems solved by technology

[0003] Atomic frequency standards are widely used in satellite positioning, navigation and communication, instrumentation, astronomy and other fields, which require high precision and stability of atomic frequency standards. Traditional atomic frequency standards cannot guarantee the stability of their working conditions. Monitoring is not conducive to the maintenance of atomic frequency standards

In addition, due to the varactor diode modulation circuit used in the traditional rubidium frequency standard, the varactor diode is a temperature-sensitive component. When the ambient temperature changes, the amplitude of the square wave frequency modulation will inevitably change, thereby affecting the rubidium frequency. target stability

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