A broadband real-time digital radio frequency simulation method and device

Abstract

A broadband real-time digital radio frequency simulation method and device relate to radio frequency simulation technical field, and specifically include the following processing steps: radio frequency signal is accessed to power matching unit, is transformed to the range suitable for subsequent processing, radio frequency signal is accessed to frequency conversion unit A, digital optical terminal A realizes radio frequency signal's long-distance access in turn, constructs N way input, M way output signal's real-time digital radio frequency simulation environment, utilizes radio frequency cable and will N way intermediate frequency signal respectively access to one divides M' way microstrip power divider, and accesses M root radio frequency cable after each microstrip power divider, accesses circulator B through circulator A, amplifier A, digital signal processing unit in turn again, the intermediate frequency signal that is output through combiner again is converted into radio frequency signal through frequency conversion unit B and is output; the present application can realize large-scale, super wide band radio frequency signal's access, switching and characteristic simulation, can also be modularized combination according to the number of access signal, constructs real-time digital radio frequency simulation environment.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of radio frequency simulation technology, in particular to a wideband real-time digital radio frequency simulation method and device. BACKGROUND

[0002] It is known that a wideband real-time digital radio frequency simulation device is a device capable of routing and switching radio frequency signals in a wideband frequency range, realizing efficient transmission and synthesis of signals; it can simulate various complex communication signals, including wireless communication, satellite communication, etc., for research and development and testing of communication equipment; it can optimize and plan communication networks, evaluate the coverage range and communication quality of the network, and provide a scientific basis for network planning; it can be used for the design and evaluation of antennas, simulating the radiation characteristics of antennas in different directions and at different frequencies, and optimizing the performance parameters of the antennas; it can simulate various radar signals, including pulse radar and continuous wave radar, for testing and evaluating the performance of radar systems; it can simulate signals emitted by enemy electronic equipment to help own reconnaissance equipment capture and analyze these signals and obtain valuable intelligence information; it can simulate real electronic countermeasure scenarios and signal environments to improve the skills and literacy of trainees.

[0003] With the acceleration of new technologies such as unmanned and intelligentization towards application, a large number of systems such as 5G / 6G communication systems, large-scale MIMO communication systems, radar communication integrated systems, communication and perception integrated systems, reconnaissance and exploration integrated systems, and comprehensive radio frequency integrated systems have emerged, and the testing of these equipment has 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 real use process, build a corresponding sample library, support autonomous collaboration and autonomous learning capability verification, and promote the rapid development of equipment effectiveness. The existing radio frequency simulation systems on the market, such as general wireless channel simulation devices, background signal simulation devices, and various radar simulators, have single functions, limited bandwidth, and weak packet switching capabilities, which limit their application scenarios and cannot meet the real-time radio frequency simulation testing requirements. SUMMARY

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

[0005] In order to achieve the object of the application, the present application adopts the following technical solutions:

[0006] A wideband real-time digital radio frequency simulation method, specifically comprising the following processing steps:

[0007] Step 1: input the radio frequency signal into a power matching unit, attenuate the input signal whose signal power is greater than p max , and attenuate the input signal whose signal power is less than p minamplifying the input signal to transform the input radio frequency signal power into a range suitable for subsequent processing[p min ,p max ];

[0008] Step 2: The radio frequency signal with power range in[p min ,p max ] is converted by frequency conversion unit A to transform the input radio frequency signal into intermediate frequency signal;

[0009] Step 3: The intermediate frequency signal is connected to digital optical terminal A to convert the intermediate frequency signal into optical signal, and the optical signal is connected to digital optical terminal B4 through optical fiber to convert the optical signal into intermediate frequency signal by photoelectric conversion unit in digital optical terminal B to realize long-distance access of radio frequency signal;

[0010] Step 4: Real-time digital radio frequency simulation environment of N input and M output signals is constructed, which needs N microstrip power dividers of 1 to M', M microstrip combiners of N', (N+M) frequency conversion units, and a plurality of radio frequency cables, signal amplifiers A, loads, circulators and adjustable attenuators. The N intermediate frequency signals are connected to the microstrip power dividers of 1 to M' through radio frequency cables, and M radio frequency cables are connected to each microstrip power divider;

[0011] Step 5: Each radio frequency cable connected to the microstrip power divider is connected to one of the input / output terminals of circulator A, and the other output terminal is connected to signal amplifier A and digital signal processing unit in turn. 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 connected to the M microstrip combiners of N' in turn. The output terminals of the M microstrip combiners are connected to signal amplifier B in series to compensate for the power loss caused by signal synthesis, so that the signal intensity before and after the signal amplifier B remains consistent.

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

[0014] The calculation method of M' and N' in step (4) of the wideband real-time digital radio frequency simulation method is as follows:

[0015] ① Taking the logarithm of M and N to get and

[0016] m' = log2(M)

[0017] n' = log2(N)

[0018] ② Taking the integer of m' and n' to get

[0019]

[0020] ③M' and m, N' and n are related as

[0021] M' = 2 m

[0022] N' = 2 n .

[0023] The wideband real-time digital radio frequency simulation method, in step 4, when M < M', the radio frequency port of the microstrip power divider is suspended, at this time, a load is added to the suspended radio frequency port to ensure the stability of the signal amplitude distributed by the microstrip power divider.

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

[0025] The wideband real-time digital radio frequency simulation method, in step 6, when N < N', the radio frequency port of the combiner is suspended, at this time, a load is added to the suspended radio frequency port to ensure the stability of the signal amplitude synthesized by the microstrip combiner, and realize the signal routing exchange and synthesis of any input and output.

[0026] The wideband real-time digital radio frequency simulation method, the digital signal processing unit is provided with an adjustable attenuator, and the control computer connected with the frequency conversion unit and the digital signal processing unit sets the adjustable attenuator built-in the digital signal processing unit according to the actual situation, if the link is open circuit, the adjustable attenuator is set to maximum, and if the link is closed circuit, the attenuation of the adjustable attenuator is 0dB.

[0027] A wideband real-time digital radio frequency simulation device, comprising N microstrip power dividers, M microstrip combiners, (N+M) frequency conversion units A, and a plurality of radio frequency cables, signal amplifiers A, loads, circulators and adjustable attenuators.

[0028] Wherein, the radio frequency input signal is connected with the input interface of the (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 with 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 with one end of the optical fiber, the other end of the optical fiber is connected with 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 connected with the input port of a M' way microstrip power divider respectively, the M radio frequency cables on the output port of the microstrip power divider are connected with the input / output port of the circulator A, the signal amplifier A and the digital signal processing unit are connected in series on the other output end of the circulator A, the output port of the digital signal processing unit is connected with the input port of the circulator B, the input / output port of the circulator B is connected with the M N' way microstrip combiner, 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 with the input port of the frequency conversion unit B.

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

[0030] The wideband real-time digital radio frequency simulation method and device have the following advantages: the method is different from the existing channel simulation equipment and radar simulator, can realize the access, switching and characteristic simulation of large-scale and super wideband radio frequency signals, and can be modularized combined according to the number of access signals to build a real-time digital radio frequency simulation environment. BRIEF DESCRIPTION OF DRAWINGS

[0031] Fig. 1 It is a structural schematic diagram of the present application.

[0032] Fig. 2 It is a signal processing flow chart of the present application.

[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 application can be explained in detail through the following examples, and the purpose of the disclosure is to protect all technical improvements within the scope of the present application.

[0035] The accompanying drawings are combined with the detailed description of the present application. Figs. 1-2 The wideband real-time digital radio frequency simulation method specifically includes the following processing steps:

[0036] Step 1: the radio frequency signal is accessed to the power matching unit 1, and the signal power exceeding p maxthe input signal with power lower than p min amplify the input signal with power lower than p min ,p max ];

[0037] Step 2: the radio frequency signal with power range in [p min ,p max ] is converted into intermediate frequency signal through frequency conversion unit A2;

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

[0039] Step 4: build real-time digital radio frequency simulation environment of N input and M output signals, which needs N microstrip power dividers 5 with 1 / M' branches, M microstrip combiners 12 with N' branches, (N+M) frequency conversion units, and a plurality of radio frequency cables, signal amplifiers A6, loads and adjustable attenuators, the calculation method of M' and N' is as follows:

[0040] ① take the logarithm of M and N to get

[0041] m' = log2(M)

[0042] n' = log2(N)

[0043] ② take the integer of m' and n' to get

[0044]

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

[0046] M' = 2 m

[0047] N' = 2 n ;

[0048] N radio frequency signals are connected to the microstrip power divider 5 with 1 / M' branches through radio frequency cables, and M radio frequency cables are connected after each microstrip power divider 5; when M

[0049] Step 5: Each of the RF cables connected to the back of the microstrip power divider 5 is connected to one of the input / output ports of the circulator A10, and the other output port is connected to the signal amplifier A6 and the digital signal processing unit 7 in sequence. 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 and the signal amplifier A6 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. Then, according to the control computer instructions, the characteristic processing unit simulates the wireless channel propagation characteristics and the radar echo and clutter environment characteristics. Finally, the digital signal is converted into an intermediate frequency signal by the digital-to-analog conversion unit, and the input port of the circulator A10 is connected through the RF cable. The digital signal processing unit 7 has an adjustable attenuator. The control computer connected to the frequency conversion unit and the digital signal processing unit sets the adjustable attenuator in the digital signal processing unit 7 according to the actual situation. If the link is open, the adjustable attenuator is set to the maximum. If the link is open, the adjustable attenuator is set to 0dB.

[0050] Step 6: The signals output by the N microstrip power dividers 5 and processed by the digital signal processing unit 7 are connected to the M N'-way microstrip combiners 12. The output end of the M microstrip combiners 12 is connected in series with the signal amplifier B, which compensates for the power loss caused by signal synthesis, so that the signal strength before and after the microstrip combiner 12 and the signal amplifier B is consistent. When N

[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, which realizes the simulation and synthesis of the signal propagation effect between any input port and any output port.

[0052] A wideband real-time digital radio frequency simulation device, comprising N one-to-M' way microstrip power dividers 5, M N'-way microstrip combiners 12, (N+M) frequency conversion units, and a plurality of RF cables, signal amplifiers A6, loads, and adjustable attenuators.

[0053] Wherein, the radio frequency input signal is connected with the output interface of the power matching unit 1 and the input interface of the (N+M) frequency conversion units A2, the output interface of the frequency conversion unit A2 is connected with 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 with one end of the optical fiber 9, the other end of the optical fiber 9 is connected with 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 connected with the input ports of a M' way microstrip power divider 5, the M radio frequency cables on the output ports of the microstrip power divider 5 are connected with the input / output ports of the circulator A10, the signal amplifier A6 and the digital signal processing unit 7 are connected in series on the other output end of the circulator A10, the output port of the digital signal processing unit 7 is connected with the input port of the circulator B11, the input / output port of the circulator B11 is connected with the M N' way microstrip combiner 12, the amplifier B is connected between the output port of the microstrip combiner 12 and the frequency conversion unit B8, the output port of the microstrip combiner 12 is connected with the input port of the frequency conversion unit B13.

[0054] Embodiment 1

[0055] Step 1: the radio frequency signals with amplitude of 30dBm and -70dBm are input into the power matching unit 1, the input signals with signal power exceeding 10dBm are attenuated, and the input signals with signal power lower than -40dBm are amplified, so that the input radio frequency signal power is transformed into the range [-40dBm, 10dBm] suitable for subsequent processing.

[0056] Step 2: the radio frequency signals with power in the range [-40dBm, 10dBm] are input into the frequency conversion unit A2, the radio frequency signals with input signal frequency in the range of 1MHz-300GHz are transformed into intermediate frequency signals with center frequency of 3.5GHz and bandwidth of 2GHz;

[0057] Step 3: the intermediate frequency signals are input into the digital optical terminal A3, the intermediate frequency signals are converted into optical signals, the optical signals are transmitted through the optical fiber 9 for a long distance, the optical terminal B4 is connected on the other end of the optical fiber 9, and the optical signals are converted into radio frequency intermediate frequency signals by the photoelectric conversion unit, so that the radio frequency signals are accessed in a large scale for a long distance;

[0058] Step 4: the real-time digital radio frequency simulation environment of N=7 input and M=13 output signals is constructed, N=7 M' way microstrip power dividers, M=13 N' way microstrip combiners, 20 frequency conversion units, and a plurality of radio frequency cables, amplifiers, loads and adjustable attenuators are needed, wherein the calculation method of M' and N' is as follows:

[0059] ① the sum of M and N is taken as the logarithm of 2

[0060]

[0061] ②m' and n' are rounded up to get

[0062]

[0063] ③M' and m, N' and n are related as

[0064]

[0065] N=7 intermediate frequency signals are connected to a microstrip power divider of M'=16 by radio frequency cables, and M=13 radio frequency cables are connected to each power divider. When (M=13) < (M'=16), the radio frequency ports of the power divider are suspended, and a load is added to the suspended radio frequency ports to ensure the stability of the signal amplitude distributed by the microstrip power divider;

[0066] Step 5: Each radio frequency cable connected to the microstrip power divider 5 is connected to one input / output terminal of the circulator A10, and the other output terminal is connected to the signal amplifier A6 and the digital signal processing unit 7 in turn. The signal processed by the digital signal processing unit 7 is connected to the input terminal 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 and the signal amplifier A6 is consistent. The radio frequency 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 radio frequency signal into a digital signal. According to the control computer instruction, the characteristic processing unit simulates the wireless channel propagation characteristics and the radar echo and clutter environment characteristics. Then the digital signal is converted into an intermediate frequency signal by the digital-to-analog conversion unit, and finally connected to the input terminal of the circulator A10 through the radio frequency cable. The control computer sets the adjustable attenuator built-in the digital signal processing unit 7 according to the actual situation. If the link is open, the adjustable attenuator is set to the maximum, and if the link is closed, the attenuation of the adjustable attenuator is 0dB;

[0067] Step 6: The signals output by the N=7 microstrip power dividers 5 and processed by the digital signal processing unit 7 are connected to the M=13 N'=8 microstrip combiners 12, realizing the signal routing exchange and synthesis of any input and output terminals. When (N=7) < (N'=8), the radio frequency ports of the microstrip combiner 12 are suspended, and a load is added to the suspended radio frequency ports to ensure the stability of the signal amplitude synthesized by the combiner;

[0068] Step 8: A signal amplifier B is connected in series at the output terminal of the M=13 microstrip combiners 12 to compensate for the power loss caused by signal synthesis, so that the signal strength before and after the microstrip combiner 12 and the signal amplifier B is consistent;

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

[0070] Embodiment 2

[0071] Step 1: The radio frequency signals with amplitudes of 20 dBm and -60 dBm are input into the power matching unit 1, and the input signals with signal power exceeding 10 dBm are attenuated, and the input signals with signal power lower than -40 dBm are amplified, so that the input radio frequency signal power is transformed into the range [-40 dBm, 10 dBm] suitable for subsequent processing.

[0072] Step 2: The radio frequency signals with power in the range [-40 dBm, 10 dBm] are input into the frequency conversion unit A2, and the radio frequency signals with frequency in the range 1 MHz-300 GHz are converted into intermediate frequency signals with center frequency of 3.5 GHz and bandwidth of 2 GHz;

[0073] Step 3: The intermediate frequency signals are input into the digital optical terminal A3, and the intermediate frequency signals are converted into optical signals, and the optical signals are transmitted over a long distance through the optical fiber 9; the optical terminal B4 is connected at the other end of the optical fiber 9, and the optical signals are converted into radio frequency signals by the photoelectric conversion unit, so that the radio frequency signals are accessed over a long distance and in a large scale;

[0074] Step 4: A real-time digital radio frequency simulation environment of N=15 input and M=27 output signals is constructed, which requires N=15 microstrip power dividers with M' paths, M=27 microstrip combiners with N' paths, 42 frequency conversion units, and a plurality of radio frequency cables, amplifiers, loads and adjustable attenuators, wherein the calculation methods of M' and N' are as follows:

[0075] ① The sum of the logarithms of M and N is obtained

[0076]

[0077] ② The sum of the integers of m' and n' is obtained

[0078]

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

[0080]

[0081] The N=15 intermediate frequency signals are connected to a M'=32 microstrip power divider by radio frequency cables, and M=27 radio frequency cables are connected to the power divider. When (M=27) is less than (M'=32), the radio frequency ports of the power divider are suspended, and a load is added to the 5 suspended radio frequency ports to ensure the stability of the signal amplitude distributed by the microstrip power divider.

[0082] Step 5: Each radio frequency cable connected to the microstrip power divider 5 is connected to one input / output port of the circulator A10, and the other output port is connected to the signal amplifier A6 and the digital signal processing unit 7 in sequence. 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 and the signal amplifier A6 is consistent. The radio frequency 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 radio frequency signal into a digital signal. According to the control computer instruction, the characteristic processing unit simulates the wireless channel propagation characteristics and the radar echo and clutter environment characteristics. 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. The control computer sets the adjustable attenuator in the digital signal processing unit 7 according to the actual situation. If the link is open, the adjustable attenuator is set to the maximum, and if the link is closed, the attenuation of the adjustable attenuator is 0dB.

[0083] Step 6: The signals output by the N=15 microstrip power dividers 5 and processed by the digital signal processing unit 7 are connected to the M=27 N'=16 microstrip combiners 12, realizing the signal routing exchange and synthesis between any input and output. When (N=15) is less than (N'=16), the radio frequency ports of the microstrip combiner 12 are suspended, and a load is added to the suspended radio frequency ports to ensure the stability of the signal amplitude synthesized by the combiner.

[0084] Step 8: A signal amplifier B is connected in series at the output end of the M=27 microstrip combiners 12 to compensate for the power loss caused by signal synthesis, so that the signal strength before and after the microstrip combiner 12 and the signal amplifier B is consistent.

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

[0086] The part of the application not described in detail is the prior art.

[0087] The embodiments chosen for the purposes of disclosure herein are presently considered to be the most practical and preferred, it is to be understood that the application is intended to cover all changes and modifications in the embodiments that are within the scope of the concept and the application.

Claims

1. A broadband real-time digital radio frequency simulation method, characterized by: Specifically, the following processing steps are included: Step 1: The radio frequency signal is input to the power matching unit, and the signal power exceeds... The input signal is attenuated, and the signal power is lower than that of the input signal. The input signal is amplified to convert the power of the input radio frequency signal to a range suitable for subsequent processing. ; Step 2: Set the power range to... The radio frequency signal is converted into an intermediate frequency signal by the frequency conversion unit A. Step 3: Connect the intermediate frequency signal to digital optical transceiver A, convert the intermediate frequency signal to an optical signal, and connect the optical signal to digital optical transceiver B through optical fiber. Use the photoelectric conversion unit in digital optical transceiver B to convert the optical signal into an intermediate frequency signal to realize long-distance access of radio frequency signals. Step 4: Build Road input, A real-time digital radio frequency simulation environment for the output signal of the circuit is required. One point microstrip power divider for the circuit indivual microstrip combiner of the road, ( ( ) frequency converter units, and several RF cables, signal amplifier A, load, circulator and adjustable attenuator, using RF cables to connect The intermediate frequency signals of each path are connected to a branch. The circuit uses microstrip power dividers, and connects to each microstrip power divider. One radio frequency cable; Step 5: Each RF cable connected after the microstrip power divider is connected to one of the input / output terminals of circulator A, and the other output terminal is connected in series with signal amplifier A and digital signal processing unit. The signal processed by digital signal processing unit is connected to the input port of circulator B. Step 6: Put The signals output from each microstrip power divider and processed by the digital signal processing unit are respectively connected to... indivual micro-strip combiner, in A signal amplifier B is connected in series at the output of a microstrip combiner to compensate for the power loss caused by signal combining, 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 converter B and then output, thus 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: In step (4) and The calculation method is as follows: ① and Taking the logarithm of 2 yields ； ② and Round up to get ； ③ and , and The relationship is 。 3. The broadband real-time digital radio frequency simulation method according to claim 1, characterized in that: In step 4, when When the RF port of the microstrip power divider is left floating, a load is added to the floating RF port to ensure the stability of the signal amplitude distributed by the microstrip power divider.

4. The broadband real-time digital radio frequency simulation method according to claim 1, characterized in that: In step 5, signal amplifier A compensates for the power loss caused by the microstrip power divider, making the signal strength before and after the microstrip power divider consistent. The power-compensated radio frequency signal is then fed into the digital signal processing unit. The analog-to-digital converter in the digital signal processing unit converts the radio frequency signal into a digital signal. Then, according to the control computer instructions, the signal is processed by the characteristic processing unit to simulate the wireless channel propagation characteristics, radar echo, and clutter environment characteristics. Finally, the digital signal is converted into an intermediate frequency signal by the digital-to-analog converter and then connected to the input port of circulator B via a radio frequency cable.

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

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 adjustable attenuator built into the digital signal processing unit according to the actual situation. If the link is open, the adjustable attenuator is set to the maximum. If the link is open, the attenuation of the adjustable attenuator is 0dB.

7. A broadband real-time digital radio frequency simulation device, applied to the broadband real-time digital radio frequency simulation method according to any one of claims 1-6, characterized in that: include One point microstrip power divider for the circuit indivual microstrip combiner of the road, ( ) frequency converter units, as well as several RF cables, signal amplifier A, load, circulator and adjustable attenuator; The radio frequency input signal is respectively connected to the output interface of the power matching unit. The input interface of frequency converter unit A is connected to the input interface of digital optical transceiver A. The output interface of the electro-optical conversion module in digital optical transceiver A is connected to one end of an optical fiber, and the other end of the optical fiber is connected to the input interface of the photoelectric conversion module in digital optical transceiver B. The output of digital optical transceiver B... The intermediate frequency signal of the circuit is respectively connected to one branch. The input port of the microstrip power divider is connected, and the output port of the microstrip power divider is connected. One RF cable is connected to the input / output port of circulator A. A signal amplifier A and a digital signal processing unit are connected in series at the other output terminal of circulator A. The output port of the digital signal processing unit is connected to the input port of circulator B. The input / output port of circulator B is connected to... indivual A microstrip combiner is connected, and a signal amplifier B is connected between the output port of the microstrip combiner and the frequency converter unit B. The output port of the microstrip combiner is connected to the input port of the frequency converter unit B.

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