Temperature control circuit of spaceborne rubidium clock

Abstract

The invention discloses a temperature control circuit of a spaceborne rubidium clock. According to the temperature control circuit, temperature voltage signals are accurately sampled, the sampled temperature voltage signals are compared to reference signals generated in real time in a voltage comparison circuit, through real-time selection of reference voltages, a signal scope after comparison is restricted in each quantification area, then the signals after the comparison are amplified (the gain size is consistent with the quantity of selector switches), the amplified voltage signals are right in the full-scale range voltage scope of A / D sampling, then an MCU receives A / D data and expands an A / D sampling bit number, every time when the MCU samples the data, the MCU needs to control the voltage comparison circuit in real time and reselect proper switches and then carries out data sampling of a next time, and at the same time, based on the data after expansion, the MCU realizes high-precision temperature control through a heating driving circuit by use of a digit control algorithm (PID).

Description

technical field [0001] The invention relates to a temperature control circuit of a space-borne rubidium clock, which belongs to the technical field of satellite navigation. Background technique [0002] The space-borne rubidium clock is a key stand-alone unit for navigation satellites, and the performance index of the product will directly determine the accuracy range of satellite navigation, so the performance of the space-borne rubidium clock is very important. [0003] Spaceborne rubidium clock products are greatly affected by temperature. With the continuous improvement of satellite application requirements, the demand for higher index spaceborne rubidium clock engineering is more urgent. As the product index is getting higher and higher, the influence of temperature is extremely sensitive, and temperature changes will seriously affect The 10MHz output frequency of the high-index spaceborne rubidium clock is very important to the long-term frequency stability of the whol...

AI Technical Summary

Problems solved by technology

[0004] At present, space-borne rubidium clock products adopt a general analog temperature control circuit method, which has the problems of limited temperature control accuracy, wide temperature control range, and low temperature control sensitivity. However, with the continuous development of satellite navigation technology, satellite The requirements for spaceborne rubidium clock products are getting higher and higher, and the precise temperature control capability of spaceborne rubidium clock products will be one of the important factors restricting product performance indicators

[0005] Based on the existing conditions, the method of temperature control (analog + digital circuit) has the following bottleneck problems. The highest bit of the existing aerospace-grade A / D chip is 14 bits (the actual effective bit is less than 14 bits), which cannot meet the control requirements. Temperature accuracy requirements, only when the highest bit of the A / D chip reaches 16 bits, can the capability of precise temperature control be achieved by using analog circuits + digital circuits

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