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Antenna absolute link time delay monitoring system

A technology for monitoring systems and antennas, applied in transmission systems, transmission monitoring, electrical components, etc., can solve problems such as difficult real-time monitoring, cumbersome links, and link delay changes

Active Publication Date: 2021-11-30
SHANGHAI ASTRONOMICAL OBSERVATORY CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the link from the antenna feed to the back end is relatively cumbersome. The existing method for measuring the absolute link delay of the antenna requires the entire link to be removed for segmental measurement. Difficult to achieve real-time monitoring
However, due to frequent changes in antenna rotation and temperature fluctuations, the link delay will also change accordingly

Method used

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  • Antenna absolute link time delay monitoring system
  • Antenna absolute link time delay monitoring system
  • Antenna absolute link time delay monitoring system

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Embodiment Construction

[0018] Below in conjunction with the drawings, preferred embodiments of the present invention are given and described in detail.

[0019] 1. Embodiment 1

[0020] This embodiment is based on a comb spectrum generator to realize accurate measurement and real-time monitoring of absolute link delay. In order to better illustrate this embodiment, the basic principle of the comb spectrum generator will be described first below.

[0021] Comb spectrum generator is essentially a narrow pulse former. The frequency reference of the device is provided by a hydrogen atomic clock, and finally forms a pulse train with a width of nanoseconds. , which is also known as the phase alignment signal (PCAL).

[0022] The time domain expression of the PCAL signal is:

[0023] x(t)=∑δ(t-nT)

[0024] Among them, T is the pulse period, δ(t) is a single pulse function.

[0025] Through Fourier transform, the frequency domain expression of the PCAL signal can be obtained as:

[0026]

[0027] A...

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Abstract

The invention relates to an antenna absolute link time delay monitoring system which comprises an antenna end and a rear end in signal connection with the antenna end; wherein the antenna end comprises a comb spectrum generator which is sequentially connected with a first power divider, a second power divider and a first recorder, and the second power divider and the first recorder are both connected with a first optical transceiver; the antenna feed source is sequentially connected with an adder and an antenna preceding stage, and the adder is connected with the first power divider; the rear end comprises a frequency converter which is connected with the antenna front stage, a second optical transceiver which is connected with the first optical transceiver; a second recorder which is connected with the frequency converter. According to the invention, the absolute link time delay can be directly and accurately measured on the antenna without dismounting the antenna link, and real-time monitoring is realized.

Description

technical field [0001] The invention relates to the technical field of antennas, and in particular to an antenna absolute link time delay monitoring system. Background technique [0002] Since there is a frequency converter in the antenna system, the input and output frequencies are different, and the absolute link delay measurement has always been difficult. In addition, the link from the antenna feed to the back end is relatively cumbersome. The existing method for measuring the absolute link delay of the antenna requires the entire link to be removed for segmental measurement. It is difficult to realize real-time monitoring. However, due to frequent changes in antenna rotation and temperature fluctuations, the link delay will also change accordingly. For delay-sensitive application scenarios, such as pulsar timing, high-precision GNSS, deep space exploration, UT1 measurement, etc., there is a need for real-time monitoring of absolute link delay. Therefore, it is necess...

Claims

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Application Information

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IPC IPC(8): H04B1/40H04B17/364
CPCH04B1/40H04B17/364Y02D30/70
Inventor 常捷王锦清江永琛舒逢春
Owner SHANGHAI ASTRONOMICAL OBSERVATORY CHINESE ACAD OF SCI