CN-115643644-B - Uplink power control method and control device for satellite communication system

Abstract

The invention relates to an uplink power control method and a control device of a satellite communication system, wherein the uplink power control method of the satellite communication system comprises the following steps of S100, acquiring signal strength P 0 of a satellite downlink in clear sky; S200, measuring signal intensity P i of a satellite downlink in severe weather at a time t i , S300, calculating signal attenuation values Ad i of the downlink according to P 0 and P i , S400, dividing an uplink frequency band into a plurality of sub-frequency bands, respectively calculating signal attenuation values Au ki of each uplink sub-frequency band according to Ad i , and S500, adjusting compensation attenuation values A ki of the corresponding sub-frequency bands according to Au ki . The power compensation error of the uplink frequency band of the satellite communication system can be effectively reduced, and the control precision of the uplink power is improved.

Inventors

• ZHANG SIWEI
• MA WEI
• HAN TONG
• FAN JINGWANG
• LIU YONGGANG

Assignees

• 航天恒星科技有限公司

Dates

Publication Date

20260508

Application Date

20221017

Claims (3)

1. 1. An uplink power control method of a satellite communication system, characterized in that the uplink power control method of the satellite communication system comprises the following steps: S100, acquiring signal strength of satellite downlink in sunny weather ; S200, at Time-of-day measurement of signal strength of satellite downlink in severe weather ; S300, according to And Calculating signal attenuation value of downlink Signal attenuation value The calculation formula of (2) is as follows: = - ; S400, dividing the uplink frequency band into a plurality of sub-frequency bands according to Respectively calculating the signal attenuation value of each uplink sub-frequency band Uplink sub-band attenuation value Calculated from the following formula: Wherein, the And Calculated from the following formula: = = Wherein, the Attenuating values for downstream signals The frequency of the corresponding one of the frequencies, For the attenuation value of the uplink sub-band A corresponding frequency; the frequencies between two adjacent uplink sub-frequency bands are overlapped; s500 according to Adjusting the compensation attenuation value of the corresponding sub-band The compensation attenuation value Calculated from the following formula: Is that The compensation attenuation value of the corresponding upstream sub-band at the moment, Is that Signal attenuation values of corresponding uplink sub-frequency bands at the moment; s600, combining the link signals of the uplink sub-bands to form a complete uplink signal.
2. 2. The method for uplink power control of a satellite communication system according to claim 1, wherein in step S200, the bad weather includes rain, snow, fog, hail.
3. 3. The method for uplink power control of a satellite communication system according to claim 1 or 2, wherein the number of uplink sub-bands is two, three or four.

Description

Uplink power control method and control device for satellite communication system Technical Field The invention relates to the technical field of satellite communication, in particular to an uplink power control method and device of a satellite communication system. Background Broadband satellite communication systems generally refer to high-speed satellite communication systems that carry broadband internet access services and new broadband multimedia services. The signal transmission of the satellite communication system is greatly influenced by severe weather such as rain and snow, and the principle of the rain attenuation resistance uplink power control method of the current broadband satellite communication system is shown in figure 1, namely, the rain attenuation value compensation is carried out on uplink signals through a processor. But broadband satellite communications have a wider frequency band, higher rate, and greater capacity than traditional satellite communications. The broadband satellite communication adopts Ka frequency band at present, and the future is likely to develop to the frequency band such as Q/V, W with higher frequency. Conventional satellite communication systems, such as Ku-band broadband satellite communication systems, typically have bandwidths of only 500MHz, whereas Ka-band broadband satellite communication systems have bandwidths of up to 2.5GHz or more. Therefore, according to the current method, a uniform compensation power value is adopted in the whole uplink frequency band of satellite communication, and the compensation error is acceptable for the traditional satellite communication system with narrow bandwidth. However, in the broadband satellite communication system, if a uniform compensation power value is still adopted for the whole frequency band, the problem of large uplink power compensation error occurs. Disclosure of Invention In view of this, the present invention aims to provide a method and a device for controlling uplink power of a satellite communication system, which solve the problem of larger uplink power control error of the current satellite communication system. In a first aspect, an embodiment of the present invention provides an uplink power control method of a satellite communication system, where the uplink power control method of the satellite communication system includes: S100, acquiring signal strength P 0 of a satellite downlink in clear sky; S200, measuring the signal strength P i of a satellite downlink in severe weather at a time t i; S300, calculating a signal attenuation value Ad i of the downlink according to P 0 and P i; S400, dividing an uplink frequency band into a plurality of sub-frequency bands, and respectively calculating a signal attenuation value Au ki of each uplink sub-frequency band according to Ad i; S500, adjusting the compensation attenuation value A ki of the corresponding sub-band according to the Au ki. Preferably, in step S200, the bad weather includes rain, snow, fog, hail. Preferably, in step S300, the calculation formula of the signal attenuation value Ad i is: Adi＝P0-Pi。 Preferably, in step S400, the uplink subband attenuation value Au ki is calculated by the following formula: Wherein, the AndCalculated from the following formula: Wherein f 1 is the frequency corresponding to the downlink signal attenuation value a di, and f 2 is the frequency corresponding to the uplink subband attenuation value Au ki. Preferably, in step S500, the compensation attenuation value a ki is calculated by the following formula: Aki＝Aki-1+Auki-1-Auki A ki-1 is the compensation attenuation value of the corresponding uplink sub-band at the time t i-1, and Au ki-1 is the signal attenuation value of the corresponding uplink sub-band at the time t i-1. Preferably, after step S500, further comprising: and S600, combining the link signals of the uplink sub-frequency bands to form a complete uplink signal. Preferably, there is an overlap in frequency between two adjacent uplink sub-bands. Preferably, the number of the uplink sub-bands is two, three or four. In a second aspect, an embodiment of the present invention further provides an uplink power control device of a satellite communication system, configured to be used in the uplink power control method of a satellite communication system according to any one of the first aspect, where the uplink power control device of the satellite communication system includes: The receiver is used for receiving clear sky signals, receiving satellite downlink signals and measuring the signal intensity of the downlink signals with preset frequency; The processor is used for receiving the signal intensity information of the receiver, comparing the clear sky downlink signal intensity with the bad weather downlink signal intensity and calculating an uplink signal attenuation value; A plurality of uplink power control units corresponding to the uplink sub-frequency bands one to one, wherein the uplink