Broadband real-time digital radio frequency simulation method and device

Abstract

The invention discloses a broadband real-time digital radio frequency simulation method and device, and relates to the technical field of radio frequency simulation, and the method specifically comprises the following processing steps: enabling a radio frequency signal to be accessed to a power matching unit, converting the radio frequency signal into a range suitable for subsequent processing, enabling the radio frequency signal to be accessed to a frequency conversion unit A and a digital optical transmitter and receiver A in sequence, and achieving the remote access of the radio frequency signal; a real-time digital radio frequency simulation environment of N paths of input signals and M paths of output signals is constructed, N paths of intermediate frequency signals are respectively connected into M'path micro-strip power dividers through radio frequency cables, M radio frequency cables are connected behind each micro-strip power divider, and the signals sequentially pass through a circulator A, an amplifier A and a digital signal processing unit and then are connected into a circulator B; the intermediate frequency signal output by the combiner is converted into a radio frequency signal through a frequency conversion unit B and is output; according to the invention, access, exchange and characteristic simulation of large-scale and ultra-wideband radio frequency signals can be realized, modular combination can be carried out according to the number of access signals, and a real-time digital radio frequency simulation environment is constructed.

Description

Technical Field

[0001] The present invention relates to the technical field of radio frequency simulation, and in particular to a broadband real-time digital radio frequency simulation method and device. Background Art

[0002] It is well known that broadband real-time digital RF simulation equipment is a device that can route and exchange RF signals within a broadband frequency range to achieve efficient transmission and synthesis of signals; it can simulate various complex communication signals, including wireless communications, satellite communications, etc., for the research and development and testing of communication equipment; it can optimize and plan communication networks, evaluate network coverage and communication quality, and provide a scientific basis for network planning; it can be used for antenna design and evaluation, simulate the radiation characteristics of antennas in different directions and frequencies, and optimize the performance parameters of antennas; it can simulate various radar signals, including pulse radars, continuous wave radars, etc., for testing and evaluating the performance of radar systems; it can simulate signals emitted by enemy electronic equipment to help its own reconnaissance equipment capture and analyze these signals and obtain valuable intelligence information; it can simulate real electronic confrontation scenarios and signal environments to improve the skills and qualities of trainees.

[0003] As new technologies such as unmanned and intelligent technologies are accelerating their application, such as 5G / 6G communication systems, large-scale MIMO communication systems, radar communication integrated systems, communication perception integrated systems, reconnaissance and detection integrated systems, and integrated RF integrated systems, the testing of these equipment may have exceeded the scope of traditional methods and technical capabilities. It is urgent to build a high-dynamic real-time interactive test environment that conforms to the actual use process, build a corresponding sample library, support autonomous collaboration and autonomous learning capability verification, and promote the rapid development of equipment effectiveness. Existing RF simulation systems on the market, such as general wireless channel simulation equipment, background signal simulation equipment, various radar simulators, etc., have single functions, limited bandwidth, and weak packet switching capabilities, which limits their application scenarios and cannot meet the needs of real-time RF simulation testing. Summary of the invention

[0004] In order to overcome the deficiencies in the background technology, the present invention discloses a broadband real-time digital radio frequency simulation method and device.

[0005] In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical scheme:

[0006] A broadband real-time digital radio frequency simulation method specifically includes the following processing steps:

[0007] Step 1: The RF signal is connected to the power matching unit. max Attenuates the input signal and attenuates the signal power below p minAmplify the input signal to convert the input RF signal power into a range suitable for subsequent processing [p min ,p max ];

[0008] Step 2: Set the power range to [p min ,p max ] passes through the frequency conversion unit A to convert the input RF signal into an intermediate frequency signal;

[0009] Step 3: Connect the intermediate frequency signal to the digital optical terminal A, convert the intermediate frequency signal into an optical signal, connect the optical signal to the digital optical terminal B4 through the optical fiber, and use the photoelectric conversion unit in the digital optical terminal B to convert the optical signal into an intermediate frequency signal, so as to realize the long-distance access of the radio frequency signal;

[0010] Step 4: Build a real-time digital RF simulation environment with N input and M output signals. This requires N microstrip power dividers with one channel divided into M' channels, M microstrip combiners with N' channels, (N+M) frequency conversion units, and several RF cables, signal amplifiers A, loads, circulators, and adjustable attenuators. Use RF cables to connect the N intermediate frequency signals to the microstrip power dividers with one channel divided into M' channels, and connect M RF cables after each microstrip power divider.

[0011] Step 5: Each RF cable connected after the microstrip power divider is connected to one of the input / output ports of circulator A respectively, and the other output port is connected in series with signal amplifier A and digital signal processing unit in sequence, and the signal processed by the digital signal processing unit is connected to the input port of circulator B;

[0012] Step 6: The signals output by the N microstrip power dividers and processed by the digital signal processing unit are respectively connected to M N'-channel microstrip combiners, and a signal amplifier B is connected in series at the output end of the M microstrip combiners to compensate for the power loss caused by signal synthesis, so that the signal strength before passing through the microstrip combiner is consistent with that after passing through the signal amplifier B;

[0013] Step 7: The intermediate frequency signal output by the combiner is converted into a radio frequency signal by the frequency conversion unit B and output, thereby realizing the simulation and synthesis of the signal propagation effect between any input port and any output port.

[0014] In the broadband real-time digital radio frequency simulation method, the calculation method of M' and N' in step (4) is:

[0015] ① Take the logarithm of 2 for M and N and get the sum

[0016] m'=log2(M)

[0017] n′=log2(N)

[0018] ②Turning m' and n' upwards gives

[0019]

[0020] ③The relationship between M' and m, N' and n is

[0021] M′=2 m

[0022] N′=2 n .

[0023] In the broadband real-time digital RF simulation method, in step 4, when M<M′, the RF port of the microstrip power divider is suspended. At this time, a load is added to the suspended RF port to ensure the stability of the amplitude of the signal distributed by the microstrip power divider.

[0024] In the broadband real-time digital radio frequency simulation method, the signal amplifier A in step 5 compensates for the power loss caused by the microstrip power divider, so that the signal strength before and after the microstrip power divider is consistent; the radio frequency signal after power compensation is connected to the digital signal processing unit, the analog-to-digital conversion unit in the digital signal processing unit converts the radio frequency signal into a digital signal, and then simulates the wireless channel propagation characteristics, radar echo and clutter environment characteristics through the characteristic processing unit according to the control computer instruction, and then converts the digital signal into an intermediate frequency signal through the digital-to-analog conversion unit, and finally connects to the input port of the circulator A through the radio frequency cable.

[0025] In the broadband real-time digital RF simulation method, in step 6, when N<N′, the RF port of the combiner is suspended. At this time, a load is added to the suspended RF port to ensure the stability of the amplitude of the synthesized signal of the microstrip combiner, thereby realizing signal routing exchange and synthesis of any input and output ends.

[0026] The broadband real-time digital radio frequency simulation method has an adjustable attenuator built into the digital signal processing unit. The control computer connected to the frequency conversion unit and the digital signal processing unit sets the adjustable attenuator built into the digital signal processing unit according to actual conditions. If the link is broken, the adjustable attenuator is set to the maximum; if the link is connected, the attenuation of the adjustable attenuator is 0dB.

[0027] A broadband real-time digital radio frequency simulation device, comprising N one-to-M' microstrip power dividers, M N' microstrip combiners, (N+M) frequency conversion units A, and a number of radio frequency cables, a signal amplifier A, a load, a circulator, and an adjustable attenuator;

[0028] Among them, the radio frequency input signal is connected to the input interface of (N+M) frequency conversion units A through the output interface of the power matching unit respectively, the output interface of the frequency conversion unit A is connected to the input interface of the digital optical terminal A, the output interface of the electro-optical conversion module in the digital optical terminal A is connected to one end of the optical fiber, and the other end of the optical fiber is connected to the input interface of the photoelectric conversion module in the digital optical terminal B, the N intermediate frequency signals output by the digital optical terminal B are respectively connected to the input port of a microstrip power divider that divides into M' channels, the M radio frequency cables on the output port of the microstrip power divider are respectively connected to the input / output port of the circulator A, the other output end of the circulator A is connected in series with a signal amplifier A and a digital signal processing unit, the output port of the digital signal processing unit is connected to the input port of the circulator B, the input / output port of the circulator B is connected to M N'-channel microstrip combiners, the signal amplifier B is connected between the output port of the microstrip combiner and the frequency conversion unit B, and the output port of the microstrip combiner is connected to the input port of the frequency conversion unit B.

[0029] Due to the adoption of the above technical solution, the present invention has the following beneficial effects:

[0030] The broadband real-time digital RF simulation method and device described in the present invention are different from existing channel simulation equipment, radar simulators, etc., and can realize the access, exchange and characteristic simulation of large-scale, ultra-wideband RF signals, and can also be modularly combined according to the number of access signals to build a real-time digital RF simulation environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of the present invention.

[0032] Figure 2 It is a signal processing flow chart of the present invention.

[0033] In the figure: 1. power matching unit; 2. frequency conversion unit A; 3. digital optical terminal A; 4. digital optical terminal B; 5. microstrip power divider; 6. signal amplifier; 7. digital signal processing unit; 8. frequency conversion unit B; 9. optical fiber; 10. circulator A; 11. circulator B; 12. microstrip combiner. DETAILED DESCRIPTION

[0034] The present invention can be explained in detail by the following examples, and the purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention.

[0035] Combined with Figure 1-2 The broadband real-time digital radio frequency simulation method specifically includes the following processing steps:

[0036] Step 1: The RF signal is connected to the power matching unit 1, and the signal power exceeds p maxAttenuates the input signal and attenuates the signal power below p min Amplify the input signal to convert the input RF signal power into a range suitable for subsequent processing [p min ,p max ];

[0037] Step 2: Set the power range to [p min ,p max The RF signal of ] is converted into an intermediate frequency signal through the frequency conversion unit A2;

[0038] Step 3: Connect the intermediate frequency signal to the digital optical terminal A3, convert the intermediate frequency signal into an optical signal, connect the optical signal to the digital optical terminal B4 through the optical fiber 9, and use the photoelectric conversion module in the digital optical terminal B4 to convert the optical signal into an intermediate frequency signal, so as to realize the long-distance access of the radio frequency signal;

[0039] Step 4: Construct a real-time digital RF simulation environment with N input and M output signals. This requires N microstrip power dividers 5 with one-to-M' channels, M microstrip combiners 12 with N' channels, (N+M) frequency conversion units, and several RF cables, signal amplifiers A6, loads, and adjustable attenuators. The calculation method of M' and N' is:

[0040] ① Take the logarithm of 2 for M and N and get the sum

[0041] m'=log2(M)

[0042] n′=log2(N)

[0043] ②Turning m' and n' upwards gives

[0044]

[0045] ③The relationship between M' and m, N' and n is

[0046] M′=2 m

[0047] N′=2 n ;

[0048] Use radio frequency cables to connect N intermediate frequency signals to a microstrip power divider 5 that divides them into M' channels, and connect M radio frequency cables behind each microstrip power divider 5; when M < M', the radio frequency port of the microstrip power divider 5 is suspended, and at this time, a load is added to the suspended radio frequency port to ensure the stability of the amplitude of the signal distributed by the microstrip power divider 5;

[0049] Step 5: Each RF cable connected after the microstrip power divider 5 is connected to one of the input / output terminals of the circulator A10 respectively, and the other output terminal is connected in series with the signal amplifier A6 and the digital signal processing unit 7 in sequence, and the signal processed by the digital signal processing unit 7 is connected to the input port of the circulator B11; the signal amplifier A6 compensates for the power loss caused by the microstrip power divider 5, so that the signal strength before and after the microstrip power divider 5 is consistent; the RF signal after power compensation is connected to the digital signal processing unit 7, and the analog-to-digital conversion unit in the digital signal processing unit 7 converts the RF signal into a digital signal. The digital signal is then processed by the characteristic processing unit according to the control computer instruction to simulate the wireless channel propagation characteristics, radar echo and clutter environment characteristics, and then the digital signal is converted into an intermediate frequency signal by the digital-to-analog conversion unit, and finally connected to the input port of the circulator A10 through the radio frequency cable; an adjustable attenuator is built in the digital signal processing unit 7, and the control computer connected to the frequency conversion unit and the digital signal processing unit sets the built-in adjustable attenuator of the digital signal processing unit 7 according to the actual situation. If the link is disconnected, the adjustable attenuator is set to the maximum, and if the link is connected, the attenuation of the adjustable attenuator is 0dB;

[0050] Step 6: The signals output by the N microstrip power dividers 5 and processed by the digital signal processing unit 7 are respectively connected to M N'-channel microstrip combiners 12, and a signal amplifier B is connected in series at the output end of the M microstrip combiners 12 to compensate for the power loss caused by signal synthesis, so that the signal strength before passing through the microstrip combiner 12 is consistent with that after passing through the signal amplifier B; when N<N', the RF port of the microstrip combiner 12 is suspended. At this time, a load is added to the suspended RF port to ensure the stability of the amplitude of the synthesized signal of the microstrip combiner 12, thereby realizing the signal routing exchange and synthesis of any input and output ends.

[0051] Step 7: The intermediate frequency signal output by the microstrip combiner 12 is converted into a radio frequency signal by the frequency conversion unit B8 and output, thereby realizing the simulation and synthesis of the signal propagation effect between any input port and any output port.

[0052] A broadband real-time digital radio frequency simulation device, comprising N one-to-M' microstrip power dividers 5, M N' microstrip combiners 12, (N+M) frequency conversion units, and a number of radio frequency cables, a signal amplifier A6, a load and an adjustable attenuator;

[0053] The RF input signal is connected to the input interface of (N+M) frequency conversion units A2 through the output interface of the power matching unit 1, the output interface of the frequency conversion unit A2 is connected to the input interface of the digital optical terminal A3, the output interface of the electro-optical conversion module in the digital optical terminal A3 is connected to one end of the optical fiber 9, the other end of the optical fiber 9 is connected to the input interface of the photoelectric conversion module in the digital optical terminal B4, the N intermediate frequency signals output by the digital optical terminal B4 are respectively connected to the input port of the microstrip power divider 5 with one M' channel, and the output port of the microstrip power divider 5 is connected to the input port of the microstrip power divider 5. The M RF cables are respectively connected to the input / output ports of the circulator A10, and the other output end of the circulator A10 is connected in series with a signal amplifier A6 and a digital signal processing unit 7 in sequence, the output port of the digital signal processing unit 7 is connected to the input port of the circulator B11, the input / output port of the circulator B11 is connected to M N'-channel microstrip combiners 12, an amplifier B is connected between the output port of the microstrip combiner 12 and the frequency conversion unit B8, and the output port of the microstrip combiner 12 is connected to the input port of the frequency conversion unit B13.

[0054] Example 1

[0055] Step 1: The RF signals with amplitudes of 30dBm and -70dBm are connected to the power matching unit 1, the input signals with signal power exceeding 10dBm are attenuated, and the input signals with signal power below -40dBm are amplified, so that the input RF signal power is converted into a range suitable for subsequent processing [-40dBm, 10dBm].

[0056] Step 2: The RF signal with a power range of [-40dBm, 10dBm] is passed through the frequency conversion unit A2, and the RF signal with a frequency range of 1MHz-300GHz is converted into an intermediate frequency signal with a center frequency of 3.5GHz and a bandwidth of 2GHz;

[0057] Step 3: Connect the intermediate frequency signal to the digital optical terminal A3, convert the intermediate frequency signal into an optical signal, and the optical signal is transmitted over a long distance through the optical fiber 9; connect the optical terminal B4 to the other end of the optical fiber 9, and use the photoelectric conversion unit to convert the optical signal into a radio frequency intermediate frequency signal, thereby realizing long-distance and large-scale access of the radio frequency signal;

[0058] Step 4: Construct a real-time digital RF simulation environment with N = 7 inputs and M = 13 outputs. This requires N = 7 microstrip power dividers with one-to-M' channels, M = 13 microstrip combiners with N' channels, 20 frequency conversion units, and several RF cables, amplifiers, loads, and adjustable attenuators. The calculation methods for M' and N' are as follows:

[0059] ① Take the logarithm of 2 for M and N and get the sum

[0060]

[0061] ②Turning m' and n' upwards gives

[0062]

[0063] ③The relationship between M' and m, N' and n is

[0064]

[0065] Use RF cables to connect N = 7 intermediate frequency signals to a microstrip power divider with M' = 16 channels, and connect M = 13 RF cables after each power divider. When (M = 13) < (M' = 16), the suspended RF port of the power divider is suspended. At this time, loads are added to the three suspended RF ports to ensure the stability of the signal amplitude distributed by the microstrip power divider.

[0066] Step 5: Each RF cable connected after the microstrip power divider 5 is connected to one of the input / output ends of the circulator A10 respectively, and the other output end is connected in series with the signal amplifier A6 and the digital signal processing unit 7 in sequence, and the signal processed by the digital signal processing unit 7 is connected to the input port of the circulator B11; the signal amplifier A6 compensates the power loss caused by the microstrip power divider 5, so that the signal strength before and after the microstrip power divider 5 is consistent; the RF signal after power compensation is connected to the digital signal processing unit 7, the analog-to-digital conversion unit in the digital signal processing unit 7 converts the RF signal into a digital signal, and then simulates the wireless channel propagation characteristics, radar echo and clutter environment characteristics through the characteristic processing unit according to the control computer instruction, and then converts the digital signal into an intermediate frequency signal through the digital-to-analog conversion unit, and finally connects to the input port of the circulator A10 through the RF cable; the control computer sets the built-in adjustable attenuator of the digital signal processing unit 7 according to the actual situation, if the link is disconnected, the adjustable attenuator is set to the maximum, if the link is open, the attenuation of the adjustable attenuator is 0dB;

[0067] Step 6: The signals outputted by N=7 microstrip power dividers 5 and passed through the digital signal processing unit 7 are respectively connected to M=13 N'=8-way microstrip combiners 12 to realize signal routing exchange and synthesis at any input and output ends. When (N=7)<(N'=8), the RF port of the microstrip combiner 12 is suspended. At this time, a load is added to the suspended RF port to ensure the stability of the signal amplitude synthesized by the combiner.

[0068] Step 8: Connect a signal amplifier B in series at the output end of M=13 microstrip combiners 12 to compensate for the power loss caused by signal synthesis, so that the signal strength before passing through the microstrip combiner 12 is consistent with that after passing through the signal amplifier B;

[0069] Step 9: The intermediate frequency signal is converted into a radio frequency signal by the frequency conversion unit B8 and output, thereby realizing the simulation and synthesis of the signal propagation effect between any input port and any output port.

[0070] Example 2

[0071] Step 1: The RF signals with amplitudes of 20dBm and -60dBm are connected to the power matching unit 1, the input signals with signal power exceeding 10dBm are attenuated, and the input signals with signal power below -40dBm are amplified, so that the input RF signal power is converted into a range suitable for subsequent processing [-40dBm, 10dBm].

[0072] Step 2: The RF signal with a power range of [-40dBm, 10dBm] is passed through the frequency conversion unit A2, and the RF signal with a frequency range of 1MHz-300GHz is converted into an intermediate frequency signal with a center frequency of 3.5GHz and a bandwidth of 2GHz;

[0073] Step 3: Connect the intermediate frequency signal to the digital optical terminal A3, convert the intermediate frequency signal into an optical signal, and the optical signal is transmitted over a long distance through the optical fiber 9; connect the optical terminal B4 to the other end of the optical fiber 9, and use the photoelectric conversion unit to convert the optical signal into a radio frequency intermediate frequency signal, thereby realizing long-distance and large-scale access of the radio frequency signal;

[0074] Step 4: Construct a real-time digital RF simulation environment with N = 15 inputs and M = 27 outputs. This requires N = 15 microstrip power dividers with one-to-M' channels, M = 27 microstrip combiners with N' channels, 42 frequency conversion units, and several RF cables, amplifiers, loads, and adjustable attenuators. The calculation methods for M' and N' are as follows:

[0075] ① Take the logarithm of 2 for M and N and get the sum

[0076]

[0077] ②Turning m' and n' upwards gives

[0078]

[0079] ③The relationship between M' and m, N' and n is

[0080]

[0081] Use RF cables to connect N = 15 intermediate frequency signals to a microstrip power divider that divides them into M' = 32 channels, and connect M = 27 RF cables after each power divider. When (M = 27) < (M' = 32), the suspended RF port of the power divider is suspended. At this time, loads are added to the five suspended RF ports to ensure the stability of the signal amplitude distributed by the microstrip power divider.

[0082] Step 5: Each RF cable connected after the microstrip power divider 5 is connected to one of the input / output ends of the circulator A10 respectively, and the other output end is connected in series with the signal amplifier A6 and the digital signal processing unit 7 in sequence, and the signal processed by the digital signal processing unit 7 is connected to the input port of the circulator B11; the signal amplifier A6 compensates the power loss caused by the microstrip power divider 5, so that the signal strength before and after the microstrip power divider 5 is consistent; the RF signal after power compensation is connected to the digital signal processing unit 7, the analog-to-digital conversion unit in the digital signal processing unit 7 converts the RF signal into a digital signal, and then simulates the wireless channel propagation characteristics, radar echo and clutter environment characteristics through the characteristic processing unit according to the control computer instruction, and then converts the digital signal into an intermediate frequency signal through the digital-to-analog conversion unit, and finally connects to the input port of the circulator A10 through the RF cable; the control computer sets the built-in adjustable attenuator of the digital signal processing unit 7 according to the actual situation, if the link is disconnected, the adjustable attenuator is set to the maximum, if the link is open, the attenuation of the adjustable attenuator is 0dB;

[0083] Step 6: The signals outputted by N=15 microstrip power dividers 5 and passed through the digital signal processing unit 7 are respectively connected to M=27 N'=16 microstrip combiners 12 to realize signal routing exchange and synthesis at any input and output ends. When (N=15)<(N'=16), the RF port of the microstrip combiner 12 is suspended. At this time, a load is added to the suspended RF port to ensure the stability of the signal amplitude synthesized by the combiner.

[0084] Step 8: Connect a signal amplifier B in series at the output end of M=27 microstrip combiners 12 to compensate for the power loss caused by signal synthesis, so that the signal strength before passing through the microstrip combiner 12 is consistent with that after passing through the signal amplifier B;

[0085] Step 9: The intermediate frequency signal is converted into a radio frequency signal by the frequency conversion unit B8 and output, thereby realizing the simulation and synthesis of the signal propagation effect between any input port and any output port.

[0086] Parts of the present invention not described in detail are prior art.

[0087] The embodiments selected herein for the purpose of disclosing the invention are currently considered to be suitable, but it should be understood that the invention is intended to include all changes and modifications of the embodiments that fall within the scope of the concept and invention.

Claims

1. A broadband real-time digital radio frequency simulation method, characterized in that: The specific processing steps include: Step 1: The RF signal is connected to the power matching unit. max Attenuates the input signal and attenuates the signal power below p min Amplify the input signal to convert the input RF signal power into a range suitable for subsequent processing [p min ,p max ]; Step 2: Set the power range to [p min ,p max The RF signal of ] is converted into an intermediate frequency signal through the frequency conversion unit A; Step 3: Connect the intermediate frequency signal to the digital optical terminal A, convert the intermediate frequency signal into an optical signal, connect the optical signal to the digital optical terminal B4 through the optical fiber, and use the photoelectric conversion unit in the digital optical terminal B to convert the optical signal into an intermediate frequency signal, so as to realize the long-distance access of the radio frequency signal; Step 4: Build a real-time digital RF simulation environment with N input and M output signals. This requires N microstrip power dividers with one channel divided into M' channels, M microstrip combiners with N' channels, (N+M) frequency conversion units, and several RF cables, signal amplifiers A, loads, circulators, and adjustable attenuators. Use RF cables to connect the N intermediate frequency signals to the microstrip power dividers with one channel divided into M' channels, and connect M RF cables after each microstrip power divider. Step 5: Each RF cable connected after the microstrip power divider is connected to one of the input / output ports of circulator A respectively, and the other output port is connected in series with signal amplifier A and digital signal processing unit in sequence, and the signal processed by the digital signal processing unit is connected to the input port of circulator B; Step 6: The signals output by the N microstrip power dividers and processed by the digital signal processing unit are respectively connected to M N'-channel microstrip combiners, and a signal amplifier B is connected in series at the output end of the M microstrip combiners to compensate for the power loss caused by signal synthesis, so that the signal strength before passing through the microstrip combiner is consistent with that after passing through the signal amplifier B; Step 7: The intermediate frequency signal output by the combiner is converted into a radio frequency signal by the frequency conversion unit B and output, thereby realizing the simulation and synthesis of the signal propagation effect between any input port and any output port.

2. The broadband real-time digital radio frequency simulation method according to claim 1, characterized in that: The calculation method of M' and N' in step (4) is: ① Take the logarithm of 2 for M and N and get the sum m'=log 2(M) n′=log 2(N) ②Turning m' and n' upwards gives ③The relationship between M' and m, N' and n is M′＝2 m N′＝2 n 。 3. The broadband real-time digital radio frequency simulation method according to claim 1, characterized in that: In step 4, when M<M′, the RF port of the microstrip power divider is suspended. At this time, a load is added to the suspended RF port to ensure the stability of the amplitude of the signal distributed by the microstrip power divider.

4. The broadband real-time digital radio frequency simulation method according to claim 1, characterized in that: The signal amplifier A in step 5 compensates for the power loss caused by the microstrip power divider, so that the signal strength before and after the microstrip power divider is consistent; the power-compensated RF signal is connected to the digital signal processing unit, and the analog-to-digital conversion unit in the digital signal processing unit converts the RF signal into a digital signal, and then simulates the wireless channel propagation characteristics, radar echo and clutter environment characteristics through the characteristic processing unit according to the control computer instruction, and then converts the digital signal into an intermediate frequency signal through the digital-to-analog conversion unit, and finally connects to the input port of the circulator A through the RF cable.

5. The broadband real-time digital radio frequency simulation method according to claim 1, characterized in that: In step 6, when N<N′, the RF port of the combiner is suspended. At this time, a load is added to the suspended RF port to ensure the stability of the amplitude of the synthesized signal of the microstrip combiner, thereby realizing signal routing exchange and synthesis of any input and output ends.

6. The broadband real-time digital radio frequency simulation method according to claim 1, characterized in that: An adjustable attenuator is built into the digital signal processing unit. The control computer connected to the frequency conversion unit and the digital signal processing unit sets the built-in adjustable attenuator of the digital signal processing unit according to actual conditions. If the link is broken, the adjustable attenuator is set to the maximum. If the link is connected, the attenuation of the adjustable attenuator is 0dB.

7. The broadband real-time digital radio frequency simulation device according to any one of claims 1 to 6, characterized in that: It includes N microstrip power dividers with one-to-M' paths, M microstrip combiners with N' paths, (N+M) frequency conversion units A, and several radio frequency cables, signal amplifiers A, loads, circulators, and adjustable attenuators; Among them, the radio frequency input signal is connected to the input interface of (N+M) frequency conversion units A through the output interface of the power matching unit respectively, the output interface of the frequency conversion unit A is connected to the input interface of the digital optical terminal A, the output interface of the electro-optical conversion module in the digital optical terminal A is connected to one end of the optical fiber, and the other end of the optical fiber is connected to the input interface of the photoelectric conversion module in the digital optical terminal B, the N intermediate frequency signals output by the digital optical terminal B are respectively connected to the input port of a microstrip power divider that divides into M' channels, the M radio frequency cables on the output port of the microstrip power divider are respectively connected to the input / output port of the circulator A, the other output end of the circulator A is connected in series with a signal amplifier A and a digital signal processing unit in sequence, the output port of the digital signal processing unit is connected to the input port of the circulator B, the input / output port of the circulator B is connected to M N'-channel microstrip combiners, the signal amplifier B is connected between the output port of the microstrip combiner and the frequency conversion unit B, and the output port of the microstrip combiner is connected to the input port of the frequency conversion unit B.

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