CN111327353A - Radio frequency link supporting ultra-long distance transmission, design method and device and storage medium - Google Patents
Radio frequency link supporting ultra-long distance transmission, design method and device and storage medium Download PDFInfo
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- CN111327353A CN111327353A CN202010163844.3A CN202010163844A CN111327353A CN 111327353 A CN111327353 A CN 111327353A CN 202010163844 A CN202010163844 A CN 202010163844A CN 111327353 A CN111327353 A CN 111327353A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/155—Ground-based stations
- H04B7/15564—Relay station antennae loop interference reduction
Abstract
The embodiment of the application discloses a method and a device for designing a radio frequency link supporting ultra-long distance transmission, a radio frequency link supporting ultra-long distance transmission and a storage medium, wherein the method comprises the following steps: acquiring transmission attributes of a signal transmission medium and a connecting device of the transmission medium; determining the corresponding relation between the transmission distance of a transmission link consisting of the signal transmission medium and the connecting device and the noise of an output end according to the transmission attribute; and calculating the number of amplifying devices and the setting interval between the amplifying devices in the transmission link according to the carrier-to-noise ratio and the linear gain required by the signal transmission quality, and arranging the amplifying devices in the transmission link according to the calculation result. According to the technical scheme of the embodiment of the application, the layout position of the amplifying device is adjusted by calculating the power and accumulated noise of the output end of each amplifier step by step, so that the specified carrier-to-noise ratio of a receiving end is ensured while the linearity of the link gain is met; the method can be used for linear gain of a long-distance link and a balance point of a specified carrier-to-noise ratio, and has a wide application prospect.
Description
Technical Field
The embodiment of the application relates to a design method and a device of a radio frequency link supporting ultra-long distance transmission, a radio frequency link supporting ultra-long distance transmission and a storage medium, and is mainly used for realizing the deployment of a long-distance high-loss radio frequency link in a satellite ground system.
Background
The carrier-to-noise ratio is a ratio for representing a useful signal to a noise power spectral density, and particularly in long-distance high-loss link transmission, the deterioration of the carrier-to-noise ratio is more obvious, which obviously affects the transmission efficiency and accuracy of the signal.
In order to ensure the gain of the ultra-long distance radio frequency link, a plurality of amplifying devices need to be arranged, but if the amplifying devices are arranged too far ahead, the amplifying devices may be saturated and the signals are distorted; if the amplifying device is arranged too far back, the accumulated noise of the link can be amplified, the carrier-to-noise ratio of the receiving end is lost, and the signal quality is obviously deteriorated. It is necessary to design a radio frequency link that can satisfy linear gain and ensure a specified carrier-to-noise ratio by taking overall calculation into consideration. Unfortunately, no relevant technical solution is currently available for reference.
Disclosure of Invention
In view of this, embodiments of the present application provide a method and an apparatus for designing a radio frequency link supporting ultra-long distance transmission, and a storage medium
In a first aspect, the present application provides a method for designing a radio frequency link supporting ultra-long distance transmission, where the method includes:
acquiring transmission attributes of a signal transmission medium and a connecting device of the transmission medium;
determining the corresponding relation between the transmission distance of a transmission link consisting of the signal transmission medium and the connecting device and the noise of an output end according to the transmission attribute;
and calculating the number of amplifying devices and the setting interval between the amplifying devices in the transmission link according to the carrier-to-noise ratio and the linear gain required by the signal transmission quality, and arranging the amplifying devices in the transmission link according to the calculation result.
In some embodiments, the transmission medium includes at least one of: feeder lines, transmission cables, waveguides;
the connecting device comprises a coupler and a power divider;
the amplifying device comprises a power amplifier;
the transmission attribute includes at least one of: gain, working level, saturation output level, equivalent noise temperature, noise power density and carrier-to-noise ratio.
In some embodiments, the method further comprises:
the output power of the output end of each amplifying device and the accumulated noise of the signal arranged in the transmission link are determined step by step, and the arrangement position of each amplifying device in the transmission link is adjusted according to the determined output power of the output end of each amplifying device and the determined accumulated noise of the signal, so that the transmission link meets the linear requirement of the link gain, and the carrier-to-noise ratio of the receiving end meets the transmission requirement.
In a second aspect, an embodiment of the present application provides an apparatus for designing a radio frequency link supporting ultra-long distance transmission, where the apparatus includes:
the acquisition unit is used for acquiring the transmission properties of the signal transmission medium and the connecting device of the transmission medium;
the first determining unit is used for determining the corresponding relation between the transmission distance of a transmission link consisting of the signal transmission medium and the connecting device and the noise of an output end according to the transmission attribute;
the computing unit is used for computing the number of amplifying devices arranged in the transmission link and the setting interval between the amplifying devices according to the carrier-to-noise ratio and the linear gain required by the signal transmission quality;
an arrangement unit for arranging the amplifying device in the transmission link in dependence of the calculation result.
In some embodiments, the transmission medium includes at least one of: feeder lines, transmission cables, waveguides;
the connecting device comprises a coupler and a power divider;
the amplifying device comprises a power amplifier;
the transmission attribute includes at least one of: gain, working level, saturation output level, equivalent noise temperature, noise power density and carrier-to-noise ratio.
In some embodiments, the apparatus further comprises:
the second determining unit is used for determining the output power of the output end of each amplifying device arranged in the transmission link and the accumulated noise of the signal step by step;
and the adjusting unit is used for adjusting the layout position of each amplifying device in the transmission link according to the determined output power of the output end of each amplifying device and the signal accumulated noise, so that the transmission link meets the linear requirement of the link gain, and the carrier-to-noise ratio of the receiving end meets the transmission requirement.
In a third aspect, an embodiment of the present application provides an ultra-long distance transmission radio frequency link, where the radio frequency link includes a transmission medium connected by a connection device; the radio frequency link also comprises an amplifying device which is arranged according to the design method of the radio frequency link supporting the ultra-long distance transmission.
In a fourth aspect, embodiments of the present application provide a non-transitory computer-readable storage medium having stored therein computer-executable instructions, which when executed by a processor, implement the steps in the above-mentioned radio frequency link design method supporting ultra-long distance transmission.
According to the technical scheme of the embodiment of the application, the layout position of the amplifying device is reasonably adjusted by calculating the power and accumulated noise of the output end of each amplifier step by step, so that the specified carrier-to-noise ratio of a receiving end is ensured while the linearity of the link gain is met; by reasonably arranging the amplifying devices in the link, a radio frequency link which can meet linear gain and ensure a specified carrier-to-noise ratio is designed. The technical scheme of the embodiment of the application can guide the long-distance radio frequency link to realize the balance point of the linear gain and the specified carrier-to-noise ratio, thereby having wide application prospect.
Drawings
Fig. 1 is a flowchart of a method for designing a radio frequency link supporting ultra-long distance transmission according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a radio frequency link supporting ultra-long distance transmission according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of a radio frequency link design device supporting ultra-long distance transmission according to an embodiment of the present application.
Detailed Description
Fig. 1 is a flowchart of a method for designing a radio frequency link supporting ultra-long distance transmission according to an embodiment of the present application, and as shown in fig. 1, the method for designing a radio frequency link supporting ultra-long distance transmission according to the embodiment of the present application includes the following processing steps:
The transmission medium includes at least one of: feeder lines, transmission cables, waveguides; in the embodiment of the present application, the transmission medium is a transmission cable, which may be a metal cable or the like.
The connecting device comprises a coupler and a power divider; in this embodiment, the coupler is a connector for connecting a transmission cable, and may connect the transmission cable to a component, or may connect multiple segments of the transmission cable.
The amplifying device comprises a power amplifier;
the transmission attribute includes at least one of: gain, working level, saturation output level, equivalent noise temperature, noise power density and carrier-to-noise ratio.
And 102, determining the corresponding relation between the transmission distance of a transmission link consisting of the signal transmission medium and the connecting device and the noise at the output end according to the transmission attribute.
In the embodiment of the present application, the gain and the carrier-to-noise ratio of a transmission link are mainly determined according to the transmission parameters of a transmission medium, so as to determine whether an amplifying device needs to be arranged on the transmission link and what type of amplifying device needs to be arranged. Of course, in an actual transmission link, the influence of the transmission parameters of the connecting device on the transmission link and the transmission parameters of some components arranged in the transmission link need to be considered, so that the transmission link can ensure the transmission performance of signals, such as carrier-to-noise ratio, transmission power, and the like, and the transmission link in the embodiment of the present application can adapt to long-distance data transmission.
And 103, calculating the number of amplifying devices arranged in the transmission link and the setting interval between the amplifying devices according to the carrier-to-noise ratio and the linear gain required by the signal transmission quality, and arranging the amplifying devices in the transmission link according to the calculation result.
In this step, according to the service quality requirements of signal transmission, such as carrier-to-noise ratio, transmission power, and the like, a corresponding amplifying device is arranged in the transmission link, so that the transmission link of the embodiment of the present application can meet the transmission requirements.
Fig. 2 is a schematic structural diagram of a radio frequency link supporting ultra-long distance transmission according to an embodiment of the present application, and as shown in fig. 2, the radio frequency link supporting ultra-long distance transmission according to the embodiment of the present application includes a transmission feeder, and corresponding amplifying devices are arranged on the transmission feeder at intervals.
In this example, it is assumed that the relevant transmission parameters of the power amplifier, the transmission feeder and the amplifying device are as follows:
the relevant parameters of the power amplifier are as follows:
a. saturated output level P-1 power amplifier＝47dBm；
b. Normal output level PPower amplifier＝33.5dBm；
c. Equivalent noise temperature TPower amplifier＝T0290K; k represents the temperature in Kelvin.
In the embodiment of the present application, the transmission parameters of a general transmission feeder are as follows: gain GFeed line 1＝-10dB；
When the transmission feeder line comprises the cable, the transmission parameters of the cable are as follows: gain GCable with a protective layer＝-2dB/m
When the transmission feeder line comprises the waveguide, the transmission parameters of the waveguide are as follows: gain GWaveguide＝-0.7dB/m
The transmission parameters of the amplification device 1 are as follows:
a. gain GAmplification device 1＝43dB；
b. Saturated output level P-1 device 1＝15dBm；
The transmission parameters of the amplification device 2 are as follows:
a. gain GAmplification device 2＝43dB；
b. Saturated output level P-1 device 2＝15dBm；
The transmission parameters of the amplifying device 3 are as follows:
a. gain GAmplifying device 3＝43dB；
b. Saturated output level P-1 device 3＝15dBm；
In the embodiment of the present application, the related transmission parameters of the amplifying devices may be the same or different.
Wherein, the equivalent noise temperature Te of the input end of the lossy passive feed line is (L-1) × T0L represents a passive feeder loss true value;
equivalent noise Te ═ F-1) × T at the input of the active device0F represents the true loss value of the active device;
equivalent noise n at the input of the feeder or deviceInput deviceK Te; k represents a boltzmann constant;
equivalent noise n at the output of the feeder or deviceOutput ofK Te + G; g denotes the gain of the feed line or device.
Noise n converted from preceding stage equipment to output end of current stage equipmentPreceding stageN1+ G; n1 represents equivalent noise of a previous stage device;
the signal carrier-to-noise ratio C/N0 of the output end of the equipment is 10log (C-N)Output of-nPreceding stage) (ii) a C denotes carrier power of a transmission signal.
Table 1 shows a calculation method of the output-end reduced noise power in the radio frequency link, and as shown in table 1, the noise and carrier-to-noise ratio C/N0 at the output end of the long-distance radio frequency link can be calculated according to various indexes such as various transmission media, connecting devices, and amplifying devices in the radio frequency link.
TABLE 1
As can be seen from table 1, when the amplifying device is arranged too far from the front position of the transmission link, the loss of the feed line at the front stage becomes small, the output carrier-to-noise ratio is guaranteed, but the maximum output level of the amplifying device is too high and saturated; when the amplifying device is arranged too far behind the transmission link, the loss of the feed line at the front stage is large, the amplifying device can ensure that the gain is linear, but the equivalent noise at the output end is increased, and the carrier-to-noise ratio cannot be ensured.
In summary, according to the embodiments of the present application, by reasonably arranging the positions of the amplifying devices in the transmission link, the gain linearity of each stage of amplifying device is ensured, and the specified carrier-to-noise ratio at the output end of the link is ensured, thereby implementing the ultra-long distance radio frequency link.
Fig. 3 is a schematic structural diagram of a radio frequency link design device supporting ultra-long distance transmission according to an embodiment of the present application, and as shown in fig. 3, the radio frequency link design device supporting ultra-long distance transmission according to the embodiment of the present application includes:
an obtaining unit 301, configured to obtain a signal transmission medium and a transmission attribute of a connection device of the signal transmission medium;
a first determining unit 302, configured to determine, according to the transmission attribute, a corresponding relationship between a transmission distance of a transmission link formed by the signal transmission medium and the connecting device and an output end noise;
a calculating unit 303, configured to calculate the number of amplifying devices set in the transmission link and the setting interval between the amplifying devices according to the carrier-to-noise ratio and the linear gain required by the signal transmission quality;
an arrangement unit 304 for arranging the amplifying means in the transmission link in dependence of the calculation result.
In some embodiments, the transmission medium includes at least one of: feeder lines, transmission cables, waveguides;
the connecting device comprises a coupler and a power divider;
the amplifying device comprises a power amplifier;
the transmission attribute includes at least one of: gain, working level, saturation output level, equivalent noise temperature, noise power density and carrier-to-noise ratio.
In some embodiments, the apparatus further comprises:
a second determining unit (not shown in fig. 3) for determining the output power of the output end of each amplifying device arranged in the transmission link and the accumulated noise of the signal stage by stage;
and an adjusting unit (not shown in fig. 3) for adjusting the layout position of each amplifying device in the transmission link according to the determined output power and the signal accumulated noise at the output end of each amplifying device, so that the transmission link meets the link gain linearity requirement, and the carrier-to-noise ratio at the receiving end meets the transmission requirement.
The above description of the apparatus embodiments, similar to the above description of the method embodiments, has similar beneficial effects as the method embodiments. For technical details not disclosed in the radio frequency link design device supporting ultra-long distance transmission in the embodiment of the present application, please refer to the related description of the embodiment of the radio frequency link design method supporting ultra-long distance transmission in the embodiment of the present application.
According to the technical scheme of the embodiment of the application, the layout position of the amplifying device is reasonably adjusted by calculating the power and accumulated noise of the output end of each amplifier step by step, so that the specified carrier-to-noise ratio of a receiving end is ensured while the linearity of the link gain is met; by reasonably arranging the amplifying devices in the link, a radio frequency link which can meet linear gain and ensure a specified carrier-to-noise ratio is designed. The technical scheme of the embodiment of the application can guide the long-distance radio frequency link to realize the balance point of the linear gain and the specified carrier-to-noise ratio, thereby having wide application prospect.
The embodiment of the application also discloses a radio frequency link for ultra-long distance transmission, which comprises a transmission medium connected by a connecting device; the radio frequency link also comprises an amplifying device which is arranged according to the design method of the radio frequency link supporting the ultra-long distance transmission of the previous embodiment. The specific structure can refer to the transmission link shown in fig. 2.
The embodiment of the present application further describes a non-transitory computer-readable storage medium, in which computer-executable instructions are stored, and when executed by a processor, the computer-executable instructions implement the steps in the method for designing a radio frequency link supporting ultra-long distance transmission according to the above embodiment.
It should be appreciated that reference throughout this application to "one embodiment" or "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. It should be understood that, in the various embodiments of the present application, the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application. The above-mentioned serial numbers of the embodiments of the present application are merely for description and do not represent the merits of the embodiments.
It should be noted that, in the present application, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. The above-described device embodiments are only illustrative, for example, the division of the unit is only one logical function division, and there may be other division ways in actual implementation, such as: multiple units or components may be combined, or may be integrated into another system, or some features may be omitted, or not implemented. In addition, the coupling, direct coupling or communication connection between the components shown or discussed may be through some interfaces, and the indirect coupling or communication connection between the devices or units may be electrical, mechanical or other forms.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units; can be located in one place or distributed on a plurality of network units; some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, all functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may be separately regarded as one unit, or two or more units may be integrated into one unit; the integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.
The above description is only for the embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (8)
1. A method for designing a radio frequency link supporting ultra-long distance transmission, the method comprising:
acquiring transmission attributes of a signal transmission medium and a connecting device of the transmission medium;
determining the corresponding relation between the transmission distance of a transmission link consisting of the signal transmission medium and the connecting device and the noise of an output end according to the transmission attribute;
and calculating the number of amplifying devices and the setting interval between the amplifying devices in the transmission link according to the carrier-to-noise ratio and the linear gain required by the signal transmission quality, and arranging the amplifying devices in the transmission link according to the calculation result.
2. The method of claim 1, wherein the transmission medium comprises at least one of: feeder lines, transmission cables, waveguides;
the connecting device comprises a coupler and a power divider;
the amplifying device comprises a power amplifier;
the transmission attribute includes at least one of: gain, working level, saturation output level, equivalent noise temperature, noise power density and carrier-to-noise ratio.
3. The method of claim 2, further comprising:
the output power of the output end of each amplifying device and the accumulated noise of the signal arranged in the transmission link are determined step by step, and the arrangement position of each amplifying device in the transmission link is adjusted according to the determined output power of the output end of each amplifying device and the determined accumulated noise of the signal, so that the transmission link meets the linear requirement of the link gain, and the carrier-to-noise ratio of the receiving end meets the transmission requirement.
4. An apparatus for designing a radio frequency link supporting ultra-long distance transmission, the apparatus comprising:
the acquisition unit is used for acquiring the transmission properties of the signal transmission medium and the connecting device of the transmission medium;
the first determining unit is used for determining the corresponding relation between the transmission distance of a transmission link consisting of the signal transmission medium and the connecting device and the noise of an output end according to the transmission attribute;
the computing unit is used for computing the number of amplifying devices arranged in the transmission link and the setting interval between the amplifying devices according to the carrier-to-noise ratio and the linear gain required by the signal transmission quality;
an arrangement unit for arranging the amplifying device in the transmission link in dependence of the calculation result.
5. The apparatus of claim 4, wherein the transmission medium comprises at least one of: feeder lines, transmission cables, waveguides;
the connecting device comprises a coupler and a power divider;
the amplifying device comprises a power amplifier;
the transmission attribute includes at least one of: gain, working level, saturation output level, equivalent noise temperature, noise power density and carrier-to-noise ratio.
6. The apparatus of claim 5, further comprising:
the second determining unit is used for determining the output power of the output end of each amplifying device arranged in the transmission link and the accumulated noise of the signal step by step;
and the adjusting unit is used for adjusting the layout position of each amplifying device in the transmission link according to the determined output power of the output end of each amplifying device and the signal accumulated noise, so that the transmission link meets the linear requirement of the link gain, and the carrier-to-noise ratio of the receiving end meets the transmission requirement.
7. An ultra-long distance transmission radio frequency link, characterized in that the radio frequency link comprises transmission media connected by a connection device; the radio frequency link also comprises an amplifying device arranged according to the design method of the radio frequency link supporting the ultra-long distance transmission of any one of claims 1 to 3.
8. A non-transitory computer-readable storage medium having stored thereon computer-executable instructions that, when executed by a processor, implement the steps of the method for designing an rf link supporting ultra-long distance transmission as set forth in any one of claims 1 to 3.
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