Calibration device and method for a satellite two-way time-frequency transmission system

A two-way time and frequency transfer technology, applied in transmission systems, radio transmission systems, electrical components, etc., can solve problems such as lack of calibration, and achieve the effect of improving measurement accuracy

Active Publication Date: 2018-06-29
BEIJING INST OF RADIO METROLOGY & MEASUREMENT
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Problems solved by technology

In China, although the satellite two-way time comparison link has been established, the related calibration work has not been carried out

Method used

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  • Calibration device and method for a satellite two-way time-frequency transmission system
  • Calibration device and method for a satellite two-way time-frequency transmission system

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Embodiment Construction

[0051] In order to illustrate the present invention more clearly, the present invention will be further described below in conjunction with preferred embodiments and accompanying drawings. Similar parts in the figures are denoted by the same reference numerals. Those skilled in the art should understand that the content specifically described below is illustrative rather than restrictive, and should not limit the protection scope of the present invention.

[0052] The calibration device for the satellite two-way time-frequency transmission system provided in this embodiment is equivalent to a fully two-way transceiver, and the radio frequency signals sent and received all pass on one signal path, so the transmission delay of the transmission frequency conversion process and the reception frequency conversion process can be kept absolutely consistent. In the end, the satellite two-way time-frequency transfer system has very little influence on the measurement synchronization er...

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Abstract

The invention discloses a device and method for correcting a bidirectional time frequency transmission system of a satellite, and the device comprises a control correction unit which enables a 70MHz intermediate-frequency signal from the bidirectional time frequency transmission system of the satellite to be transmitted to a signal processing unit or enables a 70MHz intermediate-frequency signal from the signal processing unit to be transmitted to the bidirectional time frequency transmission system of the satellite; and the signal processing unit which enables the 70MHz intermediate-frequency signal from the control correction unit to be converted into a Ku-band signal or enables a Ku-band signal from an antenna feeder unit to be converted into the 70MHz intermediate-frequency signal. The antenna feeder unit achieves the bidirectional transmission of a wireless signal with a satellite antenna of the bidirectional time frequency transmission system. According to the technical scheme of the invention, the device and method solve a problem of a synchronization error caused by the difference of transmission time delay of a receiving channel and a transmitting channel in a bidirectional time frequency transmission device of the satellite.

Description

technical field [0001] The invention relates to a satellite two-way calibration device. More specifically, it relates to a calibration device and method for a satellite two-way time-frequency transmission system. Background technique [0002] Satellite two-way time comparison is a widely used remote comparison method of high-precision time and frequency values. Since it was proposed in the 1960s and applied to time comparison experiments, it has undergone many technological changes, especially in communication. The commercialization of satellites and the development of pseudo-code spread spectrum ranging technology make the two-way time comparison equipment more and more simplified, and the performance index is getting higher and higher. [0003] At present, among more than 50 time laboratories in the world, about 20 have satellite two-way links and participate in the calculation of international atomic time TAI. These links include the Asia-Pacific two-way time comparison ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/185
CPCH04B7/18515
Inventor 于航
Owner BEIJING INST OF RADIO METROLOGY & MEASUREMENT
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