CN-122026816-A - 5GNTN low-orbit satellite frequency conversion device for realizing broadband coverage

CN122026816ACN 122026816 ACN122026816 ACN 122026816ACN-122026816-A

Abstract

The invention relates to a 5GNTN low-orbit satellite frequency conversion device for realizing broadband coverage, which comprises a reference clock unit, a frequency conversion unit, a local oscillator leakage suppression unit, a gain selection control unit and a frequency synthesis control unit, wherein the output end of the reference clock unit is connected with the input end of the frequency conversion unit, the output end of the frequency conversion unit is connected with the input end of the local oscillator leakage suppression unit, the output end of the local oscillator leakage suppression unit is connected with the input end of the gain selection control unit, and the output end of the gain selection control unit is connected with the input end of the frequency synthesis control unit. By adopting the 5GNTN low-orbit satellite frequency conversion device for realizing broadband coverage, through the design of broadband and large dynamic gain, the invention not only meets the requirement of the current 5G NTN low-orbit satellite for covering the frequencies from s wave band to ka wave band, but also provides an effective frequency conversion means for covering the broadband for navigation satellites, military satellites and the like.

Inventors

WANG ZHI
LI BIYONG
Mao Fanyu

Assignees

创远信科(上海)技术股份有限公司

Dates

Publication Date: 20260512
Application Date: 20251222

Claims (6)

1. The 5GNTN low-orbit satellite frequency conversion device for realizing broadband coverage is characterized by comprising a reference clock unit, a frequency conversion unit, a local oscillator leakage suppression unit, a gain selection control unit and a frequency synthesis control unit, wherein the output end of the reference clock unit is connected with the input end of the frequency conversion unit, the output end of the frequency conversion unit is connected with the input end of the local oscillator leakage suppression unit, the output end of the local oscillator leakage suppression unit is connected with the input end of the gain selection control unit, and the output end of the gain selection control unit is connected with the input end of the frequency synthesis control unit; The reference clock unit is used for switching internal and external 10MHz reference clocks, locking frequency to 100MHz clock through the clock distribution chip, providing clock reference for the local oscillation chip, the frequency conversion unit is used for switching through and frequency conversion to ka band, the local oscillation leakage suppression unit is used for segmenting through different frequencies and matching different filter groups, the gain selection control unit is used for adjusting channel gain, carrying out power adjustment in a large dynamic range through switching gain amplification channels and gain attenuation channels, and the frequency synthesis control unit is used for controlling frequency output of different frequency bands and carrying out signal output from s frequency bands to ka frequency bands.
2. The device for realizing wide-band coverage of 5GNTN low-orbit satellite according to claim 1, wherein the reference clock unit comprises a clock distribution chip, a second switch, an external reference and an internal reference crystal oscillator, the clock distribution chip is connected with the second switch, the second switch is connected with the external reference, the output end of the external reference is connected with the input end of the clock distribution chip through the second switch, the output end of the internal reference crystal oscillator is connected with the input end of the clock distribution chip through the second switch, and the clock distribution chip is used for switching the internal reference and the external reference, provides reference and locks the frequency to 100MHz.
3. The device for realizing wide-band coverage of 5GNTN low-orbit satellite according to claim 1, wherein the frequency conversion unit comprises a first switch, a first digital control attenuator, an analog attenuator, an absorption switch, a 90-degree bridge, a mixer and a local oscillator chip, the first switch is connected with the input end of the first digital control attenuator, the output end of the first digital control attenuator is connected with the input end of the absorption switch through the analog attenuator, the output end of the absorption switch is connected with the input end of the mixer through the 90-degree bridge, the output end of the local oscillator chip is connected with the input end of the mixer, the first switch is used for selecting a frequency conversion channel, and the 90-degree bridge is used for matching the differential input requirement of the mixer.
4. The device for realizing wideband coverage of 5GNTN low-orbit satellite as claimed in claim 1, wherein the local oscillator leakage rejection unit comprises a fourth switch, a fifth switch, a first bandpass filter, a second bandpass filter, a third bandpass filter, a fourth bandpass filter, a first highpass filter and a second highpass filter, the output end of the fourth switch is connected with the input ends of the first bandpass filter, the second bandpass filter and the third bandpass filter respectively through the fourth switch, the output ends of the first bandpass filter, the second bandpass filter and the third bandpass filter are connected with the input ends of the fourth switch through the ninth switch, the output end of the fourth switch is connected with the input end of the fourth bandpass filter and the input end of the first highpass filter respectively, the output end of the fourth switch is also connected with the input end of the first amplifier, the output end of the fourth bandpass filter is connected with the output end of the fourth bandpass filter, and the output end of the fourth bandpass filter is connected with the fourth highpass filter.
5. The device for realizing broadband coverage of 5GNTN low-orbit satellite according to claim 1, wherein the gain selection control unit comprises a second amplifier, a second digital control attenuator, a second selected sixth switch, a third amplifier, a fixed attenuator, a fourth amplifier and a seventh switch, wherein the output end of the second amplifier is connected with the input end of the second selected sixth switch through the second digital control attenuator, the output end of the sixth switch is connected with the input end of the third amplifier, the output end of the third amplifier is connected with the input end of the fourth amplifier through the fixed attenuator, the output end of the fourth amplifier is connected with the seventh switch, and the output end of the sixth switch is connected with the input end of the seventh switch through the third digital control attenuator and the fourth digital control attenuator.
6. The device for realizing wideband coverage of 5GNTN low-orbit satellite according to claim 1, wherein the frequency synthesis control unit comprises a second attenuator, a fifth amplifier, a third attenuator and an eighth alternative switch, the output end of the second attenuator is connected with the input end of the fifth amplifier, and the output end of the fifth amplifier is connected with the input end of the eighth alternative switch through the third attenuator.

Description

5GNTN low-orbit satellite frequency conversion device for realizing broadband coverage Technical Field The invention relates to the field of satellite frequency conversion, in particular to the field of 5G NTN low-orbit satellites, and particularly relates to a 5GNTN low-orbit satellite frequency conversion device for realizing broadband coverage. Background With the development of 5G NTN low orbit satellites, the satellite frequency conversion with large dynamic gain adjustment is very challenging for 5G NTN broadband coverage. The design mode of the fixed frequency band and the fixed gain of the traditional frequency conversion module has narrower frequency band coverage and poorer power gain adjustment performance, and the invention not only meets the requirement of the current 5G NTN low-orbit satellite for covering the frequency from s wave band to ka wave band by the design of wide frequency band and large dynamic gain, but also provides an effective frequency conversion means for covering wide frequency band for navigation satellites, military satellites and the like. Disclosure of Invention The invention aims to overcome the defects of the prior art and provide the 5GNTN low-orbit satellite frequency conversion device which has high effectiveness, high precision and wider application range and can realize broadband coverage. In order to achieve the above object, the 5GNTN low-orbit satellite frequency conversion device for realizing broadband coverage of the present invention is as follows: The 5GNTN low-orbit satellite frequency conversion device for realizing broadband coverage is mainly characterized by comprising a reference clock unit, a frequency conversion unit, a local oscillator leakage suppression unit, a gain selection control unit and a frequency synthesis control unit, wherein the output end of the reference clock unit is connected with the input end of the frequency conversion unit, the output end of the frequency conversion unit is connected with the input end of the local oscillator leakage suppression unit, the output end of the local oscillator leakage suppression unit is connected with the input end of the gain selection control unit, and the output end of the gain selection control unit is connected with the input end of the frequency synthesis control unit; The reference clock unit is used for switching internal and external 10MHz reference clocks, locking frequency to 100MHz clock through the clock distribution chip, providing clock reference for the local oscillation chip, the frequency conversion unit is used for switching through and frequency conversion to ka band, the local oscillation leakage suppression unit is used for segmenting through different frequencies and matching different filter groups, the gain selection control unit is used for adjusting channel gain, carrying out power adjustment in a large dynamic range through switching gain amplification channels and gain attenuation channels, and the frequency synthesis control unit is used for controlling frequency output of different frequency bands and carrying out signal output from s frequency bands to ka frequency bands. Preferably, the reference clock unit comprises a clock distribution chip, a second switch, an external reference and an internal reference crystal oscillator, the clock distribution chip is connected with the second switch, the second switch is connected with the external reference, the output end of the external reference is connected with the input end of the clock distribution chip through the second switch, the output end of the internal reference crystal oscillator is connected with the input end of the clock distribution chip through the second switch and is used for switching the internal reference and the external reference, and the clock distribution chip provides reference and locks frequency to 100MHz. Preferably, the frequency conversion unit comprises a first switch, a first digital control attenuator, an analog attenuator, an absorption switch, a 90-degree bridge, a mixer and a local oscillator chip, wherein the first switch is connected with the input end of the first digital control attenuator, the output end of the first digital control attenuator is connected with the input end of the absorption switch through the analog attenuator, the output end of the absorption switch is connected with the input end of the mixer through the 90-degree bridge, the output end of the local oscillator chip is connected with the input end of the mixer, the first switch is used for selecting a frequency conversion channel, and the 90-degree bridge is used for matching the differential input requirement of the mixer. Preferably, the local oscillator leakage suppression unit includes a fourth switch, a fifth switch, a first bandpass filter, a second bandpass filter, a third bandpass filter, a fourth bandpass filter, a first highpass filter and a second highpass filter, the output end of the fourth swi