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A Method for Analyzing Work Efficiency of a Damaged Satellite-to-Earth Digital Transmission Antenna

A technology of data transmission antenna and analysis method, applied in transmission monitoring, transmission system, electrical components, etc., can solve problems such as lack of performance evaluation, analysis and evaluation of overall antenna loss channel margin, etc., to facilitate evaluation, avoid damage and The effect of unnecessary loss

Active Publication Date: 2017-12-22
CHINA ACADEMY OF SPACE TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the above analysis methods of working efficiency after antenna damage, the overall loss of the antenna and the channel margin in the use of satellite communication are not analyzed and evaluated, and there are still deficiencies in the evaluation of the use efficiency of the antenna after damage

Method used

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  • A Method for Analyzing Work Efficiency of a Damaged Satellite-to-Earth Digital Transmission Antenna
  • A Method for Analyzing Work Efficiency of a Damaged Satellite-to-Earth Digital Transmission Antenna
  • A Method for Analyzing Work Efficiency of a Damaged Satellite-to-Earth Digital Transmission Antenna

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Experimental program
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Embodiment

[0071] The relevant technical indicators of the preset satellite-ground data transmission antenna are as follows:

[0072] Carrier frequency: 8390MHz (X-band)

[0073] Modulation method: QPSK

[0074] System bit error rate: 10 -7

[0075] Code rate: 150Mbps

[0076] Satellite ground height: 700km

[0077] Ground reception elevation angle: 5°

[0078] Coding method: convolutional coding

[0079] Satellite transmission power: 2W

[0080] Satellite Antenna Gain: 28dB

[0081] The work efficiency analysis of the damaged digital transmission antenna is as follows:

[0082] 1) Digital channel satellite-ground link

[0083] The link calculation formula when using error correction coding is as follows:

[0084]

[0085] In the formula, is the ratio of the actual received bit energy to the noise power spectral density, referred to as the bit SNR, P EIRP is the equivalent isotropic radiated power (EIRP) emitted by the satellite antenna; Q r is the qual...

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Abstract

A method for analyzing the working performance of a damaged satellite-to-ground data transmission antenna, (1) calculate the satellite effective transmission power EIRP according to the satellite transmitter output power, satellite antenna gain and transmission channel loss; (2) calculate the satellite effective transmission power EIRP according to the average ground height of the satellite Calculate the maximum slant distance R of signal transmission with the lowest elevation angle of the ground receiving antenna; (3) calculate the free space loss Lf of the signal according to the downlink carrier frequency and R of the satellite data transmission signal; (4) calculate the signal free space loss Lf according to the atmospheric loss, receiving antenna pointing loss, receiving Antenna polarization loss and rain attenuation value and Lf calculate the whole transmission loss L of the digital transmission signal; (5) Utilize coding gain, transmission code rate, coding rate and link margin to calculate the bit signal-to-noise ratio of the received signal; (6) According to the bit error rate requirements, calculate the bit signal-to-noise ratio actually required by the received signal, and then obtain the channel margin. If the margin is positive, the overall performance of the data transmission antenna can still meet the system requirements after the damage. Otherwise, the data transmission antenna is damaged. After work performance is affected.

Description

technical field [0001] The invention relates to an antenna work performance analysis method, in particular to a work performance analysis method after a satellite-to-earth digital transmission antenna is damaged. Background technique [0002] The standard parabolic data transmission antenna commonly used in satellite communication is composed of reflector, feed source, orthogonal mode coupler, uplink and downlink filters, feed source support, antenna pointing mechanism, back reinforcement structure and antenna support structure. The antenna reflection surface is widely used is a carbon / epoxy panel aluminum honeycomb sandwich structure composite reflector antenna. The reflective surface of the composite parabolic antenna is a carbon fiber honeycomb sandwich structure formed by curing the inner skin, honeycomb core, outer skin and through embedded blocks through J-47B, C, and D adhesives at medium temperature. After the antenna body is solidified and molded, the rear embedded...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B17/15H04B17/309
Inventor 张晓莹李志张志民尹建凤庞羽佳
Owner CHINA ACADEMY OF SPACE TECHNOLOGY
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