A flexible power adjustment method for digital transparent forwarding payload

Abstract

The application provides a flexible power adjustment method for a digital transparent forwarding load, the method comprises an adjustable gain frequency converter, a digital transparent processor and a high-power traveling wave tube amplifier in a repeater link, and the repeater link of the method adopts a gain distribution method which is optimized by jointly setting the gain of single machines. The flexible application of satellite services is improved from the traditional repeater "two-hop" communication to the digital transparent on-board load of the user-to-user "one-hop" function, the gain distribution method which is optimized by jointly setting the gain of the adjustable gain frequency converter, the digital transparent processor and the high-power traveling wave tube amplifier in the repeater link is proposed, the flexibility of the load link gain and power adjustment is improved, and the flexible adjustment of the downlink power under different uplink power conditions is realized under the conditions of different types of transmitting and receiving ground terminals.

Description

Technical Field

[0001] This invention belongs to the field of multi-beam satellite system technology, and relates to flexible power satellite services, specifically to a flexible power adjustment method for digital transparent relay payloads. Background Technology

[0002] Reference (1): Li Caiping et al. Research on high-speed switching technology based on broadband flexible repeater [J]. Dissertation 2014. Reference (1) proposes that broadband flexible repeater is a semi-transparent repeater with on-board processing capability. It adopts digital channelization processing technology based on non-uniform filter banks, which combines the advantages of traditional transparent repeaters and regenerative repeaters. It is flexible and reliable, can support small-granularity switching, avoids the constraints of physical layer signal system, increases system capacity, meets the needs of variable bandwidth services, and is one of the main development directions of future on-board repeaters. This reference introduces the broadband flexible repeater, points out the differences between regenerative repeaters and traditional repeaters, and introduces several characteristics and advantages of digital transparent repeaters.

[0003] Reference (2): Hui Tengfei et al. Research on key technologies of payload for a new generation of high-throughput satellite communication system [J]. Space Electronics Technology, 2021, 4. Reference (2) proposes that with the increasing commercial competition, larger capacity and higher flexibility have become the main goals of the development of high-throughput (HTS) systems, and the new generation of HTS systems is about to enter the "Tbps" era. Based on the introduction of the basic concepts and composition of HTS systems, the development history of HTS systems is briefly summarized. According to the capabilities and development stages, the development history of HTS satellites can be roughly divided into four generations. Focusing on the development of the new generation of HTS systems, the key technologies of high-throughput satellite payloads are analyzed from the perspective of satellite payloads. These include ultra-large-scale high-performance multi-beam antenna technology that can significantly improve the communication capacity of the system, hopping beam communication technology, flexible payload technology, digital transparent forwarding processing technology, beam precoding technology and microwave photonics-based on-board forwarding technology that can improve the flexibility of networking and service applications, etc., which aim to provide a reference for the construction and development of my country's new generation of HTS systems. This paper provides a comprehensive overview of high-throughput systems and summarizes key payload technologies, emphasizing the crucial role of digital transparent forwarding technology in flexible payloads and future communications.

[0004] Reference (3): Tang Qiuhong et al. Theoretical Analysis of Power Adjustment in Civil Aviation TES Satellite Communication System [J]. Communication World, 2016, 21. Reference (3) proposes that due to the decline in polarization isolation index of civil aviation C-band satellite network, the transmission power of each station exceeds the standard, and the satellite transponder is in long-term power saturation, which seriously affects the working condition and lifespan of the transponder. It studies the method of power adjustment for civil aviation C-band satellite network and the theoretical basis of power adjustment, thereby improving the working condition of C-band satellite network. Based on more specific frequency band and index requirements, this reference proposes a power control principle in micro communication system and describes the method and results of transponder power adjustment.

[0005] Li Hui et al. disclosed a Chinese invention patent with patent number ZL201510398487.8, which describes a method for implementing a hybrid flexible transponder. This method mainly involves all-optical frequency conversion and all-optical switching technologies in the field of communication, as well as technologies such as non-uniform channelization and circuit switching. The implementation structure of this invention mainly consists of two parts: microwave photonic transponder and microwave digital flexible transponder. The microwave photonic transponder fully utilizes the advantages of photonics, such as broadband, high speed, and low power consumption, to achieve transparent transpondering with large-granularity variable bandwidth. The microwave digital flexible transponder serves as an auxiliary method, enabling transparent transpondering and processing transpondering with small-to-medium granularity variable bandwidth. The two parts are jointly controlled by onboard control equipment to achieve flexible transpondering of multi-beam signals with different granularity bandwidths. Simultaneously, the hybrid flexible transponder also provides multiple digital interfaces, allowing connection to onboard packet switching processing payloads. This invention has advantages such as low implementation complexity, support for reconfigurable design and multi-mode transpondering, and the microwave photonic transponder and microwave digital flexible transponder can also be used independently.

[0006] Zhou Juejia et al. disclosed Chinese invention patent CN201880000742.0, which discloses a method and apparatus for controlling uplink transmit power, a base station, and user equipment. The method includes: determining the uplink resource allocation ratio of the user equipment in a preset high-power mode; if the uplink resource allocation ratio is greater than or equal to a preset uplink percentage threshold corresponding to the preset high-power mode, determining power adjustment information; and sending the uplink resource allocation ratio and the power adjustment information to the user equipment, so that when the user equipment transmits uplink information in the preset high-power mode according to the uplink resource allocation ratio, it controls the uplink transmit power according to the power adjustment information. Using the uplink transmit power control method provided in this disclosure, when the UE is configured to transmit uplink information according to a higher uplink resource allocation ratio, the UE can be configured to lower its uplink transmit power according to the power adjustment information, effectively avoiding SAR exceedance and simultaneously improving the uplink information transmission capability of the UE in the preset high-power transmit mode. Summary of the Invention

[0007] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a flexible power adjustment method for digital transparent forwarding payloads, and to solve the technical problem that the flexibility of power adjustment in the existing technology needs to be further improved.

[0008] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0009] A flexible power adjustment method for digitally transparent repeater loads is disclosed. The repeater link of this method includes an adjustable gain inverter, a digitally transparent processor, and a high-power traveling wave tube amplifier. The repeater link of this method adopts a gain allocation method optimized by joint setting of single-machine gain.

[0010] Specifically, the method includes the following steps:

[0011] Step 1: Determine the range of the transponder input power level Pz based on the transmitting terminal capability and the gain of the satellite receiving antenna.

[0012] Step 2: Within the power level range (Pz-25dBm) to (Pz+25dBm), provide an uplink signal Pin at the transponder input, and the transponder subsystem will start up and operate according to the default gain setting.

[0013] Step 3: Determine the transponder output power level Pout based on the downlink EIRP and antenna gain.

[0014] Step 4: Determine the repeater link default gain Gz based on the uplink and downlink power levels.

[0015] Step 5: Based on the repeater link gain value G, adjust the single-unit gain according to the following steps:

[0016] Step 501, the uplink level of the transponder is ΔP = Pin - Pz = G - Gz.

[0017] Step 502: When 0dB < ΔP ≤ 5dB, adjust Gdtp to reduce the gain by the order of ΔP.

[0018] Step 503: When 5dB < ΔP ≤ 15dB, adjust Gdtp + Gtwt to reduce the gain by the order of ΔP.

[0019] Step 504: When 15dB < ΔP ≤ 25dB, adjust Gdtp + Gtwt + Gdc to reduce the gain by the order of ΔP.

[0020] In step 505, when ΔP = 0dB, the transponder does not make any adjustments.

[0021] Step 506: When -5dB≤ΔP<0dB, adjust Gdtp to increase the gain by the order of ΔP.

[0022] Step 507: When -15dB≤ΔP<-5dB, adjust Gdtp+Gdc to increase the gain by the order of ΔP.

[0023] Step 508: When -25dB≤ΔP<-15dB, adjust Gdtp+Gdc+Gtwt to increase the gain by the order of ΔP.

[0024] in:

[0025] Gdtp represents the digital transparent processor gain;

[0026] Gtwt represents the gain of a high-power traveling wave tube amplifier;

[0027] Gdc represents the gain of an adjustable gain frequency converter.

[0028] In step 503, Gdtp is adjusted first.

[0029] In step 504, Gdtp and Gtwt are adjusted first.

[0030] In step 507, Gdtp is adjusted first.

[0031] In step 508, Gdtp and Gdc are adjusted first.

[0032] Compared with the prior art, the present invention has the following technical effects:

[0033] (I) This invention improves the flexible application of satellite services from the traditional two-hop communication of transponders to a user-to-user one-hop digital transparent on-board payload. It proposes a gain allocation method that optimizes the gain of transponder link adjustable gain frequency converter, digital transparent processor and high-power traveling wave tube amplifier by jointly setting the gain of each unit. This improves the flexibility of payload link gain and power adjustment. Under different types of transmitting and receiving ground terminal conditions, it realizes flexible adjustment of downlink power output under different uplink power conditions.

[0034] (II) The method of the present invention is designed and applied in relevant civilian and commercial communication satellite models to design and implement a digital transparent forwarding payload with this function. Different beam groups are set in the payload to achieve the switching between "two-hop" and "one-hop" modes, which greatly improves the flexibility of the payload.

[0035] (III) As a core payload product of high-throughput satellites in the field of multi-beam technology, the digital transparent processor of the present invention can realize flexible control of signal bandwidth, power and routing in the digital transparent payload according to the user's ground configuration requirements.

[0036] (IV) The "one-hop" load design based on the digital transparent processor of this invention combines the working characteristics of the frequency converter, the digital transparent processor and the high-power traveling wave tube amplifier, and proposes a function configuration for frequency conversion and gain adjustment of the frequency converter. Combined with the gain settings of the digital transparent processor and the high-power traveling wave tube amplifier, it provides link gain adjustment function for terminals with different transmission and reception capabilities, provides flexible power adjustment capability, and improves communication efficiency and flexibility.

[0037] (V) This invention combines the development direction and needs of digital transparent payloads, and realizes the transformation of the function of digital transparent processors from ground verification to satellite applications, laying a certain technical foundation for the application of flexible power adjustment of payloads. Attached Figure Description

[0038] Figure 1 A schematic diagram of a satellite-to-ground system for flexible service allocation of digitally transparent forwarding payloads.

[0039] Figure 2 A schematic diagram of the overall architecture for flexible power adjustment and allocation for digitally transparent forwarding payloads.

[0040] The specific content of the present invention will be further explained in detail below with reference to the embodiments. Detailed Implementation

[0041] It should be noted that, unless otherwise specified, all devices in this invention are devices known in the prior art.

[0042] High-throughput satellites employ multi-beam technology to achieve polarization isolation and spatial isolation in order to reuse frequency resources, thereby multiplying communication capacity. Multi-beam technology is a key integrated technology in high-throughput satellites. It refers to forming several point beams of the same size within a certain coverage area through a beamforming network, and planning the beams according to the needs of the satellite communication system and the networking form, with different beams communicating independently.

[0043] The Digital Transparent Processor (DTP) employs digital channelization and subband switching technologies to convert the input signal into the digital domain for subband division. It also adjusts subband power and switches subbands according to ground configuration requirements, enabling flexible control over bandwidth, power, routing, and other aspects. It is a core payload product for high-throughput satellites in the field of multibeam technology.

[0044] High-throughput satellites equipped with digital transparent processors can achieve "user-to-user" single-hop communication, building upon the traditional two-hop communication of "satellite-to-user" and "user-to-satellite." Different beam groups within a multi-beam payload can independently switch between "two-hop" and "one-hop" modes, significantly enhancing payload flexibility. A DTP link centered on a 4x4-port digital transparent processor enables flexible switching between user-beam-front, return, and DTP links.

[0045] Based on the traditional transparent repeater design, digital channelization design is added. DTP adopts digital domain channelization processing and subband switching technology to achieve flexible cross-linking, giving the system outstanding features such as strong adaptability, flexible networking, and support for diverse service types.

[0046] Flexible subband gain adjustment capability: It can independently adjust the gain of a single subband or multiple subbands, and can also turn off subbands.

[0047] Flexible routing and switching capabilities: It can switch the beam, frequency band, and bandwidth signals of the DTP access point.

[0048] Flexible application modes: Supports multiple working modes such as point-to-point, broadcast, and multicast to meet various application needs.

[0049] Satellite power resources are one of the most important onboard resources for communication satellites. The satellite's gain configuration directly affects its overall receiving performance, and its power configuration directly affects whether its downlink capability can meet usage requirements. Currently, most multi-beam satellite communication systems use a fixed equal power allocation method. When the system's service demand is very low, this power allocation algorithm obviously wastes power resources and cannot meet the needs of point-beam applications in areas with high service demand.

[0050] Based on microwave active single-unit technology and combined with digital transparent forwarding technology, this invention proposes a gain allocation method that jointly optimizes the gain settings of single-unit components, taking into account the individually adjustable gain characteristics of frequency converters, digital transparent processors, and high-power traveling wave tube amplifiers in the link, for different types, operating conditions, and power terminal conditions.

[0051] This invention provides a link gain allocation method based on digital transparent processors, which involves joint optimization of single-machine gain settings for repeater links.

[0052] This invention primarily targets ground terminals of different types, operating conditions, and power levels. By combining the individually adjustable gains of frequency converters, digital transparent processors, and high-power traveling wave tube amplifiers within the link, it ultimately achieves flexible power adjustment of the payload. Because the uplink signals transmitted to satellites from user terminals at different locations and of different types have varying power levels reaching the transponder inlet after spatial attenuation, and the downlink signal power is the same when the satellite's EIRP (Equivalent Isotropic Radiated Power) is fixed, the transponder's link gain configuration differs depending on the transmitting terminal. Traditional transponders have a limited adjustable range for link gain settings, leading to situations where low or high uplink power affects downlink power output. Therefore, to adapt to the dynamic range of uplink power and the power requirements of different user transmitting terminals, an adjustment strategy is set within the digital transparent processing forwarding link to adjust the gains of different types of individual units, achieving flexible link power adjustment.

[0053] like Figure 1 As shown, a satellite-to-ground communication system oriented towards digital transparent relay payloads consists of ground transmitting user terminals, satellites, and ground receiving user terminals. Different ground transmitting user terminals have different capabilities. For satellites, there is a large dynamic reception range. The satellite's fixed downlink ERIP can meet the needs of all receiving terminals. Therefore, when the downlink power is constant, the uplink dynamic range directly determines the dynamic range of the link gain.

[0054] The establishment of the "one-hop" communication link clarifies information such as the type of transmitting terminal. Based on this, the ground control station needs to adjust the gain configuration of this link accordingly. The transmitting terminal information can determine the transponder link ingress power information, and the link gain can be configured accordingly.

[0055] Flexible power adjustment allocation for digital transparent forwarding payloads, such as Figure 2 As shown. The standalone design in this invention:

[0056] 1) Adjustable gain frequency converter:

[0057] The adjustable gain inverter is a downconverter.

[0058] The downconverter is located at the link receiving end and is mainly used for power detection, frequency conversion, and gain adjustment of the uplink signal after low-noise amplification. The power detection section detects the signal power entering the inverter, providing uplink signal power telemetry; the frequency conversion section downconverts the user terminal frequency band where the uplink signal is located to the L-band required by the digital transparent processor input; the gain adjustment section can adjust the inverter's default gain Gdc to -10 to +10dB.

[0059] The upconverter is located in the middle section of the link and is mainly used to convert the L-band frequency of the sub-band that has completed digital channelization and switching processing to the frequency of the user terminal. The upconverter operates in fixed gain mode.

[0060] 2) Digital Transparent Processor:

[0061] As the most important component of digital transparent forwarding, the digital transparent processor's main functions include processing the input uplink intermediate frequency (IF) signal through analog-to-digital conversion, digital channelization, subband mapping, subband switching, gain control, digital channel synthesis, and digital-to-analog conversion, ultimately outputting the downlink IF analog signal; monitoring various internal operating states of the unit, performing subband power estimation and operating state detection, and framing the above information into unit telemetry information before outputting it; and receiving externally input service remote control commands to control the unit's subband gain, subband switching, subband mapping, and subband switching.

[0062] This invention mainly relates to the subband gain control function of a digital transparent processor. The subband gain control is mainly implemented by the channel processing ASIC inside the digital processor. The adjustment range of the digital transparent processor gain Gdtp is approximately -5 to +5 dB.

[0063] 3) High-power traveling wave tube amplifier:

[0064] High-power traveling wave tube (TWT) amplifiers are crucial components for downlink signal transmission and possess high gain characteristics. TWT amplifiers have a gain adjustment capability of Gtwt (20dB). TWT amplifiers must operate in input backoff mode, meaning that the uplink signal power synchronously affects the downlink signal power.

[0065] In summary, when the uplink signal power is within the saturated input operating range of the traveling wave tube amplifier, and each active unit in the link is operating at its default gain setting, the link gain adjustment capability is -25 to +25 dB.

[0066] Based on the current EIRP capabilities of terminals on the market (0.6m diameter 3W fixed amplifier and 4.5m diameter 45W fixed amplifier), and considering factors such as rain attenuation, the estimated range of poor uplink signal capability of transmitting terminals is 0-50dB.

[0067] Following the above technical solutions, specific embodiments of the present invention are given below. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent modifications made based on the technical solutions of this application fall within the protection scope of the present invention.

[0068] Example:

[0069] This embodiment presents a flexible power adjustment method for digital transparent forwarding payloads, such as... Figure 2 As shown, the repeater link of this method includes an adjustable gain frequency converter, a digital transparent processor, and a high-power traveling wave tube amplifier. The repeater link of this method adopts a gain allocation method optimized by joint setting of single-machine gain.

[0070] In this embodiment, as Figure 1 As shown, this method employs a satellite-to-ground communication system oriented towards digitally transparent forwarding payloads, which consists of a ground transmitting user terminal, a satellite, and a ground receiving user terminal.

[0071] Specifically, the method includes the following steps:

[0072] Step 1: Determine the range of the transponder input power level Pz based on the transmitting terminal capability and the gain of the satellite receiving antenna.

[0073] Step 2: Within the power level range (Pz-25dBm) to (Pz+25dBm), provide an uplink signal Pin at the transponder input, and the transponder subsystem will start up and operate according to the default gain setting.

[0074] Step 3: Determine the transponder output power level Pout based on the downlink EIRP and antenna gain.

[0075] Step 4: Determine the repeater link default gain Gz based on the uplink and downlink power levels.

[0076] Step 5: Based on the repeater link gain value G, adjust the single-unit gain according to the following steps:

[0077] Step 501, the uplink level of the transponder is ΔP = Pin - Pz = G - Gz.

[0078] Step 502: When 0dB < ΔP ≤ 5dB, adjust Gdtp to reduce the gain by the order of ΔP.

[0079] Step 503: When 5dB < ΔP ≤ 15dB, adjust Gdtp + Gtwt, prioritizing the adjustment of Gdtp to reduce the gain by the order of ΔP.

[0080] Step 504: When 15dB < ΔP ≤ 25dB, adjust Gdtp + Gtwt + Gdc, prioritizing the adjustment of Gdtp and Gtwt to reduce the gain by the order of ΔP.

[0081] In step 505, when ΔP = 0dB, the transponder does not make any adjustments.

[0082] Step 506: When -5dB≤ΔP<0dB, adjust Gdtp to increase the gain by the order of ΔP.

[0083] Step 507: When -15dB≤ΔP<-5dB, adjust Gdtp+Gdc, prioritizing the adjustment of Gdtp to increase the gain by the order of ΔP.

[0084] Step 508: When -25dB≤ΔP<-15dB, adjust Gdtp+Gdc+Gtwt, prioritizing the adjustment of Gdtp and Gdc to increase the gain by the order of ΔP.

[0085] in:

[0086] Gdtp represents the digital transparent processor gain;

[0087] Gtwt represents the gain of a high-power traveling wave tube amplifier;

[0088] Gdc represents the gain of an adjustable gain frequency converter.

[0089] The advantage of step 5 in this invention: Traditional transponders can only adapt to an uplink level range of 20dB to 30dB, and can only adapt to changes in the uplink level by individually changing the gain of the traveling wave tube amplifier; through the gain adjustment in step 5, the transponder design used in this invention can adapt to a level range of 50dB. On the basis of the original gain adjustment capability of the traveling wave tube amplifier, the gain adjustment of the downconverter and DTP significantly expands the uplink dynamic range of the entire transponder link. The expansion of the uplink dynamic level range means that the load is more adaptable to different types of transmitting terminals and working environments under complex atmospheric conditions.

[0090] Application example:

[0091] This application example is based on a flexible power adjustment method for digital transparent forwarding payloads given in the above embodiments. The method specifically includes the following steps:

[0092] Step 1: Based on the transmitting terminal's capabilities and the satellite's receiving antenna gain, determine the uplink input level range of a specific transponder from -90dBm to -40dBm.

[0093] Step 2, Pz is -65dBm, providing the uplink signal Pin.

[0094] Step 3: Based on the downlink EIRP and antenna gain, determine the transponder saturation output level Pout = 50dBm.

[0095] Step 4: Determine the transponder default gain Gz = Pout - Pz = 115dB.

[0096] Step 5: The repeater's default gain is set to provide an uplink level at the repeater's input. Based on the range of the uplink power level, perform the following operations:

[0097] When the uplink power level is -62dBm, the transponder gain G = 112dB and ΔP = -3dB. Adjusting Gdtp reduces the digital transparent processor gain from 0dB to -3dB.

[0098] When the uplink power level is -52dBm, the transponder gain G = 102dB and ΔP = -13dB. By adjusting Gdtp and Gtwt, the digital transparent processor gain is reduced from 0dB to -5dB, and the traveling wave tube amplifier gain is reduced by 8dB from the default gain.

[0099] When the uplink power level is -45dBm, the transponder gain G = 95dB and ΔP = -20dB. By adjusting Gdtp, Gtwt, and Gdc, the digital transparent processor gain is reduced from 0dB to -5dB, the traveling wave tube amplifier gain is reduced by 10dB from the default gain, and the downconverter gain is reduced by 5dB from the default gain.

[0100] When the uplink power level is -68dBm, the transponder gain G = 118dB and ΔP = 3dB. Adjusting Gdtp increases the digital transparent processor gain from 0dB to 3dB.

[0101] When the uplink power level is -78dBm, the transponder gain G = 128dB and ΔP = 13dB. By adjusting Gdtp and Gdc, the gain of the digital transparent processor is increased from 0dB to 5dB, and the downconverter gain is increased from the default gain by 8dB.

[0102] When the uplink power level is -85dBm, the transponder gain G = 125dB and ΔP = 20dB. By adjusting Gdtp, Gdc, and Gtwt, the digital transparent processor gain is increased from 0dB to 5dB, the downconverter gain is increased by 10dB from the default gain, and the traveling wave tube amplifier gain is increased by 10dB from the default gain.

[0103] Step 5 of this invention is crucial. When the uplink operating level of a traditional transponder is -75dBm to -55dBm and the output power is set to 50dBm, the transponder link can only provide 105 to 125dB. When the transmitting terminal is in a relatively good atmospheric environment, the uplink level may be higher than -55dBm. In this case, the link gain requirement is less than 105dB, but the transponder has no further adjustment capability, and over-excitation may occur. When the transmitting terminal is in a relatively poor atmospheric environment, the uplink level may be lower than -75dBm. In this case, the link gain requirement is greater than 125dB, but the transponder gain cannot be increased further, and the receiving terminal may not be able to receive the signal. The gain-adjustable transponder link configured in this invention can dynamically expand the uplink operating level to 50dB, i.e., -90dBm to -40dBm. Therefore, even under the two extreme conditions of poor atmospheric environment at the transmitting terminal and good atmospheric environment at the transmitting terminal, the transponder can still provide a link with corresponding gain, so that the signal can still be normally received by the receiving terminal after transparent transmission through the transponder.

Claims

1. A flexible power adjustment method for digital transparent forwarding payloads, characterized in that, The repeater link of this method includes an adjustable gain frequency converter, a digital transparent processor and a high-power traveling wave tube amplifier. The repeater link of this method adopts a gain allocation method optimized by joint setting of single-machine gain. The method includes the following steps: Step 1: Determine the range of the transponder input power level Pz based on the transmitting terminal capability and the on-board receiving antenna gain; Step 2: Within the power level range (Pz-25dBm) ~ Pz ~ (Pz+25dBm), provide an uplink signal Pin at the transponder input, and the transponder subsystem unit starts up and operates according to the default gain setting. Step 3: Determine the transponder output power level Pout based on the downlink EIRP and antenna gain; Step 4: Determine the repeater link default gain Gz based on the uplink and downlink power levels; Step 5: Based on the repeater link gain value G, adjust the single-unit gain according to the following steps: Step 501, the uplink level of the repeater is ΔP = Pin - Pz = G - Gz; Step 502: When 0dB < ΔP ≤ 5dB, adjust Gdtp to reduce the gain by the order of ΔP. Step 503: When 5dB < ΔP ≤ 15dB, adjust Gdtp + Gtwt to reduce the gain by the order of ΔP. Step 504: When 15dB < ΔP ≤ 25dB, adjust Gdtp + Gtwt + Gdc to reduce the gain by the order of ΔP. Step 505, when ΔP=0dB, the transponder does not make any adjustments; Step 506: When -5dB≤ΔP<0dB, adjust Gdtp to increase the gain by the order of ΔP. Step 507: When -15dB≤ΔP<-5dB, adjust Gdtp+Gdc to increase the gain by the order of ΔP. Step 508, when -25dB≤ΔP<-15dB, adjust Gdtp+Gdc+Gtwt to increase the gain by the order of ΔP; in: Gdtp represents the digital transparent processor gain; Gtwt represents the gain of a high-power traveling wave tube amplifier; Gdc represents the gain of an adjustable gain frequency converter.

2. The flexible power adjustment method for digital transparent forwarding payloads as described in claim 1, characterized in that, In step 503, Gdtp is adjusted first.

3. The flexible power adjustment method for digital transparent forwarding payloads as described in claim 1, characterized in that, In step 504, Gdtp and Gtwt are adjusted first.

4. The flexible power adjustment method for digital transparent forwarding payloads as described in claim 1, characterized in that, In step 507, Gdtp is adjusted first.

5. The flexible power adjustment method for digital transparent forwarding payloads as described in claim 1, characterized in that, In step 508, Gdtp and Gdc are adjusted first.

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