CN113949437B - Relay catch-up outfield test simulation system and method based on channel simulation technology - Google Patents

Abstract

A relay tracking field test simulation system and method based on channel simulation technology. Based on the single pulse tracking principle, three channel simulation parameters of the attenuation, phase and frequency of the tracking beacon signal are extracted; it assists computer comprehensive processing and control, based on The sum and difference signal pattern characteristics of the relay antenna are used to construct the tracking beacon signal amplitude model; the phase of the tracking beacon and difference signal is back-calculated according to the preset angle, and the zero value data of the simulation system is corrected to form the simulation parameters at the current moment, and additional Frequency offset drives the channel simulator to update the three coherent parameters in real time and run back and forth. Through the simulation system, it receives real-time feedback information of the actual angle of the satellite relay tracking system to achieve tracking in the relay tracking field test scenario. Closed-loop dynamic simulation of beacon signals; the invention realizes high-fidelity simulation of beacon signals of the tracking system, can meet multi-purpose applications, and is suitable for the application of single-pulse tracking system angle measurement systems.

Description

A relay tracking field test simulation system and method based on channel simulation technology

Technical field

The invention relates to a relay tracking field test simulation system and method based on channel simulation technology, and belongs to the technical field of relay tracking systems.

Background technique

In order to ensure the verification of system performance, the relay tracking system usually needs to organize large-scale field tests for verification and evaluation. Traditional test methods have many objective and practical problems, such as high site requirements (with special instruments and equipment such as wireless dedicated venues, turntables, and absorbing walls), long test cycles (usually 1-2 weeks), and large investment in manpower and material resources. (Product and test tooling preparation and transfer, test assembly management of multiple personnel), resource usage conflicts are serious, especially the verification and evaluation of the overall tracking performance of the system is often postponed to the field test stage, and can only be carried out in the stand-alone and sub-system wired stages. Qualitative functional performance test verification results in the failure of early exposure and early correction of the risk of excessive tolerance of some indicators, which often puts great pressure on the subsequent development progress of the model. The objective realities of field testing of relay tracking systems are high cost, long cycle, labor-intensive, and difficult to implement, which seriously restrict the cost and progress of system development.

"Design method of a single-channel single-pulse system self-tracking signal source", patent number CN200910175496.5. This patent uses complex baseband processing equipment to generate modulation signals as beacon signals. The beacon signal only has Doppler frequency, The simulation of angular error voltage does not have the simulation of phase and signal amplitude characteristics, and the high fidelity and comprehensiveness of the simulation is insufficient. In addition, there is no interaction between the simulation system and the system under test. It is an open-loop system and cannot achieve tight coupling with the system under test.

"Method and equipment for testing mobile radio equipment by means of static channel simulation", patent number CN102204135B, this patent is mainly aimed at channel simulation for wireless testing of communication systems, and the simulation is only limited to static channels, and cannot simulate the near-real-time dynamic characteristics of the channel.

Contents of the invention

The technical problem solved by this invention is to propose a relay tracking field test simulation system and method based on channel simulation technology, and extract the three channels of Doppler frequency, phase and amplitude of the tracking signal of the single-pulse single-channel tracking system. Parameters, use channel simulation technology to achieve high-fidelity simulation of beacon signals; assist computer comprehensive processing and control, the simulation system collects and receives the rotation angle information of the system under test, processes and calculates iterative channel simulation status, and realizes the simulation system and the system under test Dynamic near real-time simulation with tight coupling. It has high application value in equivalent replacement relay capture and large-scale field experiments.

The technical solution of the present invention is: a relay tracking field test simulation system based on channel simulation technology, including a beacon frequency source, a channel simulator, calibration and monitoring equipment, a comprehensive processing computer and channel microwave components;

The beacon frequency source is used to generate the intermediate frequency RF signal of the tracking beacon, and at the same time provide a unified frequency reference REF signal for other radio frequency devices in the system;

The channel simulator receives the two signals of the tracking beacon IF, and at the same time receives the control parameter information sent by the comprehensive processing computer, and completes the three coherent characteristics of the sum branch and difference branch signal amplitude, phase and frequency on the intermediate frequency to apply the channel Simulation to achieve high-fidelity simulation of beacon signals;

The comprehensive processing computer completes the comprehensive management, control and processing of the simulation system through the local area network. According to the basic system configuration data, calculation and processing generates a channel simulation parameter group to drive the channel simulator; it collects the feedback angle data of the system under test to form the system under test and the simulation system Tightly coupled closed-loop connection; combined with feedback angle data for analysis and processing, the next moment signal simulator control parameter group is generated and driven for execution, achieving near real-time dynamic characteristics simulation;

The calibration and monitoring equipment generates a calibration signal, enters the simulation system through the input coupler, and receives it back through the output coupler. The initial state calibration of the simulation system is completed through the calibration signal; during the working process of the system, the receiving beacon simulates Signal, monitor the quality of analog signals;

The channel microwave component shunts the beacon of the beacon frequency source into a sum and difference beacon, changes the frequency of the RF input and output of the channel simulator, and provides calibration and monitoring channels for calibration and monitoring equipment through coupling.

The beacon frequency source has a built-in 10MHz high-stable crystal oscillator module, which amplifies the output signal of the high-stable crystal oscillator through a phase-locked loop to generate a beacon RF signal; at the same time, the high-stable crystal oscillator is shunted at 10MHz to generate a unified reference signal REF within the system. Achieve high precision and high stability of homology.

The beacon signal generated by the beacon frequency source is a single carrier signal.

The channel simulator receives the two signals of the tracking beacon IF, and at the same time receives the control parameter information sent by the comprehensive processing computer, and completes the application of the three characteristics of sum branch and difference branch signal amplitude, phase and frequency on the intermediate frequency. Channel simulation enables high-fidelity simulation of beacon signals.

The comprehensive processing computer completes dynamic real-time control of the simulation system, collects external feedback angle data, performs data analysis and processing at the current moment, generates and downloads the control parameters of the channel simulator at the next moment, and drives the dynamic real-time update of the channel simulator. , realize the comprehensive management and control and dynamic operation of the simulation system, and form a closed-loop connection between the system under test and the simulation system. The comprehensive processing and calculation communicates with other devices through the local area network LAN interface to control the working status and parameters of each component device within the simulation system.

The comprehensive processing computer uses an asynchronous 422 serial port to communicate with the ground inspection equipment of the external system under test.

The calibration and monitoring equipment generates a calibration signal, enters the simulation system through the input coupler, and receives it back through the output coupler. The calibration signal is relied upon to complete the initial state calibration of the simulation system and obtain zero-value parameters; while the system is working During the process, the beacon analog signal is received, and the amplitude and frequency radio frequency characteristics of the analog signal are monitored in real time.

The channel microwave components include a splitter, an input test coupler, a frequency conversion device and an input/output test coupler; the splitter uses a Wilkinson bridge to convert the tracking beacon intermediate frequency IF signal sent from the front stage. It is divided into two channels with equal amplitude and equal phase, and the equivalent tracking beacon signal is split into the beacon sum branch signal and the beacon difference branch signal; the input test coupler is used to couple the calibration signal of the calibration and monitoring equipment into the input to the splitter; the frequency conversion device converts the radio frequency RF beacon signal to the intermediate frequency IF and outputs it to the channel simulator; it converts the two branch signals after superimposing the channel characteristics from the intermediate frequency IF to the radio frequency RF for transmission. The output test coupler couples the branch signals from the front stage to the radio frequency and outputs them separately, and feeds them back to the calibration and monitoring equipment in a closed loop.

The sum and difference output test coupler has high consistency in time delay, and the output section waveguide adopts waveguide components with the same structural length.

A relay tracking field test simulation method based on channel simulation technology, the steps are as follows:

1) Calibrate the zero-value parameters of the simulation system, use calibration and monitoring equipment to calibrate the initial parameters of the simulation system's own channel, and obtain the zero-value parameters of the simulation system;

2) Input the basic data configuration of the simulation system; configure the basic data of the simulation system and the dynamic parameters of the simulation channel into the comprehensive processing computer of the simulation system. The basic data includes the system zero-value parameters and the antenna sum-difference pattern curve; the dynamic parameters of the simulation channel include space Link dynamic characteristic parameters Doppler frequency and channel amplitude fluctuations;

3) Generate and output the original beacon signal; the beacon frequency source generates the beacon signal, and forms the sum and difference original beacon signals through splitting;

4) Set the initial value of the first point simulation angular error vector signal; in the pointing coordinate system, the angular error vector signal is characterized by the target deviation angle θ and the azimuth angle φ, input the initial setting values of the two parameters, and the simulation system integrated processor computer generates and , phase parameters of the difference channel, link the channel dynamic parameter data at the simulation time, form a simulation parameter package, and set the first point parameter data for channel simulation execution;

5) Start the simulation and collect the rotation information. The closed-loop feedback loop iteratively updates; the device under test receives the simulated beacon signal and drives the tracking system under test to rotate. The angle of rotation on the satellite is collected by the integrated processor computer, and based on this The target deviation angle θ and azimuth angle φ of the angular error vector of the next simulation point are formed with the initial value of the first point parameter;

6) Repeat step 4) to generate the channel simulation parameter package at the current moment, download it to the channel simulator and drive it for execution, and so on;

7) Receive analog signals in real time through calibration and monitoring equipment, and conduct real-time monitoring of the radio frequency and amplitude characteristics of the analog signals;

8) The simulation system runs for a period of 4-5 hours. On the premise that the simulation business is allowed to be interrupted, perform another zero value calibration on the system to confirm that the system zero value does not fluctuate significantly.

The advantages of the present invention compared with the prior art are:

(1) The present invention is based on channel simulation technology and can simultaneously implement channel simulation with three coherent characteristics of sum branch and difference branch signal amplitude, phase and frequency, thereby achieving high-fidelity simulation of beacon signals;

(2) The present invention uses computer comprehensive processing technology to comprehensively control and process the simulation system, collects the feedback rotation angle data of the system under test, and realizes a tightly coupled closed-loop connection between the system under test and the simulation system to form a closed-loop feedback system; combined with the feedback rotation angle The data is analyzed and processed to generate the next time signal simulator control parameter group and drive execution to achieve near-real-time dynamic characteristics simulation; the simulation system can also support open-loop work by disconnecting the corner feedback information from the system under test;

(3) The core of the system of the present invention lies in the simulation of tracking signals. The simulation can be simulation parameters generated based on objective actual physical scene simulations. It also supports certain customized simulation curves, aiming at certain boundary performance and extreme working scenarios of the relay tracking system. and performance quantitative analysis requirements, the respective simulation parameters can be formed based on theoretical formulas, and combined with open-loop and closed-loop modes, a more comprehensive and in-depth performance evaluation of the system can be achieved.

Description of the drawings

Figure 1: Relay capture and field test simulation system composition.

Figure 2 Typical application of relay capture and field test simulation system.

Figure 3 is a schematic diagram of the pointing target and deviation vector in the antenna coordinate system.

Figure 4 Antenna and beam pattern.

Figure 5 Antenna difference beam pattern.

Figure 6 Simulation system comprehensive processing computer workflow.

Figure 7 Relay capture and field test simulation system calibration.

Figure 8 422 bus angle transmission data format.

Detailed ways

A relay acquisition and tracking field test simulation system and method based on channel simulation technology, belonging to the field of satellite relay system acquisition and tracking technology. Based on the single pulse tracking principle, this invention extracts three channel simulation parameters of attenuation, phase and frequency of the tracking beacon signal; based on the sum and difference signal pattern characteristics of the relay antenna, a tracking beacon signal amplitude model is constructed, and the antenna is The theoretical angle of tracking is mapped to phase and frequency offset, assisting computer comprehensive processing and control. The simulation system receives real-time feedback of the actual angle of the satellite relay tracking system, and back-calculates the tracking beacon signal parameter values based on the principle of single-pulse tracking angle measurement. The zero-value data of the simulation system is corrected to form the simulation parameters at the current moment, which drives the channel simulator to update the three coherent parameters in real time and run back and forth. Through closed-loop information feedback, the relay can capture and follow the beacon signal in the field test scenario. Dynamic simulation; this system comes with calibration and monitoring equipment. During the application process, the zero value of the simulation system can be calibrated to monitor the working status of the system.

The present invention is a relay tracking field test simulation system based on channel simulation technology, including a beacon frequency source, a channel simulator, calibration and monitoring equipment, a comprehensive processing computer and a channel microwave component;

The beacon frequency source is used to generate the intermediate frequency RF signal of the tracking beacon, and at the same time provide a unified frequency reference REF signal for other radio frequency devices in the system;

The channel simulator receives the two signals of the tracking beacon IF, and at the same time receives the control parameter information sent by the comprehensive processing computer, and completes the three coherent characteristics of the sum branch and difference branch signal amplitude, phase and frequency on the intermediate frequency to apply the channel Simulation to achieve high-fidelity simulation of beacon signals;

The comprehensive processing computer completes the comprehensive management, control and processing of the simulation system through the local area network. According to the basic system configuration data, calculation and processing generates a channel simulation parameter group to drive the channel simulator; it collects the feedback angle data of the system under test to form the system under test and the simulation system Tightly coupled closed-loop connection; combined with feedback angle data for analysis and processing, the next moment signal simulator control parameter group is generated and driven for execution, achieving near real-time dynamic characteristics simulation;

The calibration and monitoring equipment generates a calibration signal, enters the simulation system through the input coupler, and receives it back through the output coupler. The initial state calibration of the simulation system is completed through the calibration signal; during the working process of the system, the receiving beacon simulates Signal, monitor the quality of analog signals;

The channel microwave component shunts the beacon of the beacon frequency source into a sum and difference beacon, changes the frequency of the RF input and output of the channel simulator, and provides calibration and monitoring channels for calibration and monitoring equipment through coupling.

The beacon frequency source has a built-in 10MHz high-stable crystal oscillator module, which amplifies the output signal of the high-stable crystal oscillator through a phase-locked loop to generate a beacon RF signal; at the same time, the high-stable crystal oscillator is shunted at 10MHz to generate a unified reference signal REF within the system. Achieve high precision and high stability of homology.

The beacon signal generated by the beacon frequency source is a single carrier signal.

The channel simulator receives the two signals of the tracking beacon IF, and at the same time receives the control parameter information sent by the comprehensive processing computer, and completes the application of the three characteristics of sum branch and difference branch signal amplitude, phase and frequency on the intermediate frequency. Channel simulation enables high-fidelity simulation of beacon signals.

The comprehensive processing computer completes dynamic real-time control of the simulation system, collects external feedback angle data, performs data analysis and processing at the current moment, generates and downloads the control parameters of the channel simulator at the next moment, and drives the dynamic real-time update of the channel simulator. , realize the comprehensive management and control and dynamic operation of the simulation system, and form a closed-loop connection between the system under test and the simulation system. The comprehensive processing and calculation communicates with other devices through the local area network LAN interface to control the working status and parameters of each component device within the simulation system.

The comprehensive processing computer uses an asynchronous 422 serial port to communicate with the ground inspection equipment of the external system under test.

The calibration and monitoring equipment generates a calibration signal, enters the simulation system through the input coupler, and receives it back through the output coupler. The calibration signal is relied upon to complete the initial state calibration of the simulation system and obtain zero-value parameters; while the system is working During the process, the beacon analog signal is received, and the amplitude and frequency radio frequency characteristics of the analog signal are monitored in real time.

The channel microwave components include a splitter, an input test coupler, a frequency conversion device and an input/output test coupler; the splitter uses a Wilkinson bridge to convert the tracking beacon intermediate frequency IF signal sent from the front stage. It is divided into two channels with equal amplitude and equal phase, and the equivalent tracking beacon signal is split into the beacon sum branch signal and the beacon difference branch signal; the input test coupler is used to couple the calibration signal of the calibration and monitoring equipment into the input to the splitter; the frequency conversion device converts the radio frequency RF beacon signal to the intermediate frequency IF and outputs it to the channel simulator; it converts the two branch signals after superimposing the channel characteristics from the intermediate frequency IF to the radio frequency RF for transmission. The output test coupler couples the branch signals from the front stage to the radio frequency and outputs them separately, and feeds them back to the calibration and monitoring equipment in a closed loop.

The sum and difference output test coupler has high consistency in time delay, and the output section waveguide adopts waveguide components with the same structural length.

The present invention will be described in detail below with reference to the accompanying drawings.

As shown in Figure 1, it is a block diagram of the relay tracking field test simulation system of the present invention. The simulation system is mainly composed of five parts: a beacon frequency source, a channel simulator, a calibration and monitoring device, an integrated processing computer and a channel microwave component. The integrated processing computer realizes network data communication with various functional devices through the LAN interface of the integrated test network to complete the integrated control of the system. All microwave component equipment is homologous to the reference signal of the beacon frequency source, and the input test coupler and the output test coupler output port are connected to the calibration and monitoring device. The simulation system has three external interfaces: two waveguide interfaces are used to output equivalent simulation beacons of sum and difference branches, and one 422 interface is used to collect and receive the corner information of the system under test.

Figure 2 shows a typical application of the present invention. The specific equipment selection is as follows: the beacon frequency source uses Keysight’s analog signal source, model E8257D; the channel simulator uses KSW-WNS02/ of the domestic Kunheng Shunwei Company. The 02B channel simulator is a dual-channel channel simulator that directly supports millimeter wave band channel simulation testing through internal board expansion. It has excellent multi-channel phase consistency, 100ps high-precision delay simulation, and supports a maximum bandwidth of 500MHz. Since the channel simulator has built-in up and down frequency conversion components, the original analog system architecture interrupt frequency conversion device can be replaced. The comprehensive processing computer adopts Advantech industrial computer, model IPC-610-L. The splitter is a Wilkinson 3dB power splitter bridge independently developed by the unit. The input test coupler is a coaxial coupler, the output test coupler is a coaxial to waveguide interface coupler, 10dB coupling degree, and the waveguide interface is BJ260. The calibration and monitoring equipment uses Keysight's vector network analysis, model N5247, with 4 ports. The system under test is a satellite relay tracking system. The equipment on the satellite is mainly a tracking receiver and a terminal controller. The antenna mechanism equivalent is used to equivalently replace the mechanical rotating antenna on the satellite. The terminal controller is based on the angular error of the tracking receiver. The information drives the antenna mechanism equivalent to rotate. While the antenna mechanism equivalent is rotating, it collects the angle information with high precision through rotation and then outputs the angle information to the outside through the 422 interface.

A list of instruments for typical applications is shown in Table 1 below.

Table 1 Typical application simulation system configuration list of the system

System simulation principle:

According to the master's thesis "Research and Implementation of Angular Error Signal Demodulation Technology" by Tan Wen, author of Nanjing University of Science and Technology, as shown in Figure 3, in the antenna coordinate system, the antenna azimuth axis rotation angle αx and the pitch axis rotation angle αy, the target direction deviates The angle θ between the electrical axis of the antenna and the angle between the projection line of the XOY plane of the antenna coordinate system and the X axis The included angle/> It is also the angle between the difference signal composite vector and the azimuth vector. There is a theoretical mathematical relationship between the above four parameters:

As shown in Figures 4 and 5, according to the classic single-channel single-pulse angle tracking theory, refer to the "Research on Single-channel Single-pulse Angle Tracking System" in the third issue of "Telecommunication Technology" 2005, the beacon signal is transmitted through space and reaches At the interface of the tracking antenna, a sum signal S _∑ and a difference signal S _Δ are formed through the tracking antenna. The difference branch signal is the orthogonal signal vector synthesis of the azimuth difference S _ΔA and the elevation difference S _ΔE . For the tracking receiver For example, the input signal sent by the antenna is:

In the above formula, θ is the spatial angle of the target deviating from the electrical axis, and the angle between the difference signal vectors is the sum signal antenna pattern,/> is the difference signal antenna pattern, f _doppler is the Doppler frequency shift introduced by the relative motion between satellites, and α is the relative phase difference caused by the inconsistent phase between the antenna and the difference channel.

1) Channel parameter extraction

It can be seen from the formulas of sum and difference signals sent from the antenna output end that the channel characteristics involved in the sum and difference signals input to the tracking receiver mainly include: sum signal antenna gain G _∑ , difference signal antenna gain G _Δ , Doppler Frequency shift f _doppler , difference signal vector angle And the sum and difference channel phase inconsistency phase difference α, definition/> is the total change in phase. The above parameters respectively correspond to the three parameters of the channel: amplitude, frequency and phase.

2) Signal simulation parameter generation

For the relay tracking system, based on the initial position (X0, Y0), through the rotation angles (Xa, Ya) of the antenna X and Y axes respectively, the angle θ from the antenna electrical axis and the difference signal vector angle can be calculated. According to θ and/> By looking up the antenna pattern gain curve value and the set Doppler frequency f _doppler in the table, and correcting the initial zero value parameters of the simulation system, the channel parameters are set to the channel simulator. Through accurate simulation of these three channel parameters, that is It can equivalently achieve high-fidelity simulation of relay tracking beacon signals.

3) Simulate system closed-loop dynamics

The angle information of the system under test is transmitted to the simulation system in real time through the equivalent equipment of the antenna mechanism. The comprehensive processing computer of the simulation system collects and iteratively calculates the angle data to generate simulation parameters at the next moment, which constitutes the relationship between the system under test and the simulation system. Closed-loop mechanism achieves dynamic and real-time effects.

The system workflow is as follows:

1) Calibrate the zero value parameters of the analog system, use calibration and monitoring equipment to calibrate the initial parameters of the analog system's own channels, and obtain the zero value parameters of the phase difference of the sum and difference channels of the analog system and amplitude difference zero value parameter A0;

2) Input the basic data configuration of the simulation system; configure the basic data of the simulation system and the dynamic parameters of the simulation channel into the comprehensive processing computer of the simulation system. The basic data includes the system zero-value parameters and the antenna sum-difference pattern curve; the dynamic parameters of the simulation channel include space Link dynamic characteristic parameters Doppler frequency and channel amplitude fluctuations;

Table 2 Example of system simulation parameter group configuration table

3) Generate and output the original beacon signal; the beacon frequency source generates the beacon signal, and forms the sum and difference original beacon signals through splitting. The beacon signal in this use case is 23.54GHz;

4) Set the initial value of the first point simulation angular error vector signal; in the pointing coordinate system, set the initial position angles of the X-axis and Y-axis (αx0, αy0), and the simulation system comprehensive processing computer calculates the angular error vector based on this point parameter. Target deviation angle θ and azimuth angle φ, extract antenna pattern gain G and Doppler frequency f at the same time, generate simulation parameter groups of sum and difference channels, link the channel dynamic parameter data at the simulation time, form a simulation parameter package, and transmit the parameter data to channel simulator;

5) Start the simulation, the channel simulator starts the simulation work, and updates iteratively through the 422 interface closed-loop feedback loop; the device under test receives the simulated beacon signal, drives the tracking system under test to rotate, and comprehensively processes the computer acquisition antenna mechanism equivalent The rotation angles (αx, αy) of the X-axis and Y-axis are collected by the integrated processor computer, and the parameter generation process of step 4) is repeated; the detailed workflow of the integrated processing computer is shown in Figure 6.

6) Repeat step 4) to generate the channel simulation parameter package at the current moment, download it to the channel simulator and drive it for execution, and so on;

7) Receive analog signals in real time through calibration and monitoring equipment, and conduct real-time monitoring of the radio frequency and amplitude characteristics of the analog signals;

System calibration is crucial to the normal use of the system. The schematic diagram of calibration is shown in Figure 7. Through calibration, the attenuation and phase of the sum branch and the difference branch are obtained respectively, which are used as system zero-value parameters to compensate and correct the system deviation.

The 422 interface uses the asynchronous 422 bus, which is an international standard for full-duplex serial buses and can realize point-to-point communication as a serial data bus. Use 1 pair of differential signals to realize data transmission. In this system, the transmission rate is set to 500Kbps, 1 start bit, 1 stop bit, and 1 even parity bit. Figure 8 is the 422 bus transmission data packet format.

Although the present invention has been disclosed above in terms of preferred embodiments, they are not intended to limit the present invention. Any person skilled in the art can use the technical content disclosed above to improve the technical solutions of the present invention without departing from the spirit and scope of the present invention. Possible changes and modifications are made. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope of the technical solution of the present invention. .

Claims (5)

1. A relay catch-up and outfield test simulation system based on a channel simulation technology is characterized in that: the system comprises a beacon frequency source, a channel simulator, calibration and monitoring equipment, a comprehensive processing computer and a channel microwave component;

the beacon frequency source is used for generating a tracking beacon RF signal and providing a uniform frequency reference REF signal for other radio frequency devices in the system;

the channel simulator receives two paths of signals of the capturing and following beacon IF, and simultaneously receives control parameter information sent by the comprehensive processing computer, and channel simulation of three coherent characteristics of amplitude, phase and frequency of signals of the sum branch and the difference branch is completed on the intermediate frequency, so that high-fidelity simulation of the beacon signals is realized;

the comprehensive processing computer completes comprehensive control and processing of the simulation system through the local area network, calculates and processes to generate a channel simulation parameter set according to system configuration basic data, and drives the channel simulator; collecting feedback corner data of a tested system to form tight coupling closed loop connection of the tested system and an analog system; analyzing and processing the feedback corner data to generate a control parameter set of the signal simulator at the next moment and driving the control parameter set to execute so as to achieve near-real-time dynamic characteristic simulation;

the channel microwave component comprises a branching unit, an input test coupler, frequency conversion equipment and an output test coupler; the splitter adopts Weir Jin Xunqiao to distribute equal amplitude equal phases of the capturing beacon RF signals sent by the front stage into two paths, and the equivalent capturing beacon RF signals are split into a beacon and a branch signal and a beacon difference branch signal; the input test coupler is used for coupling calibration signals of the calibration and monitoring equipment into the splitter; the frequency conversion device converts the tracking beacon RF signal to a beacon IF and outputs the beacon IF signal to the channel simulator; converting the two branch signals with superimposed channel characteristics from IF to RF for transmitting, and outputting a beacon analog signal; the output test coupler respectively couples and outputs branch signals of which the front stage is changed to the radio frequency, and closed loop feedback is fed back to the calibration and monitoring equipment;

the calibration and monitoring equipment generates a calibration signal, the calibration signal enters the simulation system through the input test coupler, and the calibration signal is received back through the output test coupler to complete the initial state calibration of the simulation system; during the working process of the system, receiving a beacon analog signal, and monitoring the quality of the analog signal;

the comprehensive processing computer completes dynamic real-time control of the simulation system, collects feedback corner data of the tested system, analyzes and processes the data at the current moment, generates and downloads control parameters of the signal simulator at the next moment, drives dynamic real-time update of the channel simulator, realizes comprehensive control and dynamic operation of the simulation system, and forms closed-loop connection of the tested system and the simulation system; the comprehensive processing computer is communicated with other devices through a Local Area Network (LAN) interface, and controls the working states and parameters of all the constituent devices in the simulation system;

the sum-difference two-way output test coupler has high delay consistency, and the output section waveguide adopts a waveguide component with equal length.

2. The relay catch-up outfield test simulation system based on the channel simulation technology according to claim 1, wherein: the beacon frequency source is internally provided with a 10MHz high-stability crystal oscillator module, and a beacon RF signal is generated by amplifying a high-stability crystal oscillator output signal in a lock-fold way through a phase-locked loop; meanwhile, 10MHz of high-stability crystal oscillator is shunted to generate a unified reference signal REF in the system, and the high-precision and high-stability homology is achieved in the system.

3. The relay catch-up outfield test simulation system based on the channel simulation technology according to claim 1, wherein: the beacon signal generated by the beacon frequency source is a single carrier signal.

4. The relay catch-up outfield test simulation system based on the channel simulation technology according to claim 1, wherein: the comprehensive processing computer adopts an asynchronous 422 serial port to communicate with ground detection equipment of an external tested system.

5. A method for simulating a relay heel strike outfield test by using the system of claim 1, comprising the steps of:

1) Calibrating zero-value parameters of the simulation system, and calibrating initial parameters of a self channel of the simulation system by using calibration and monitoring equipment to obtain the zero-value parameters of the simulation system;

2) Simulating system basic data configuration input; configuring basic data of a simulation system and dynamic parameters of a simulation channel into a comprehensive processing computer of the simulation system, wherein the basic data comprises zero-value parameters of the system, antennas and a differential pattern curve; the analog channel dynamic parameters comprise Doppler frequency and channel amplitude fluctuation of the space link dynamic characteristic parameters;

3) Generating an output beacon RF signal; the beacon frequency source generates a beacon signal, and forms a sum and difference beacon original signal through a shunt;

4) Setting an initial value of a first-point analog angle error vector signal; under a pointing coordinate system, an angle error vector signal is represented by a target off angle theta and an azimuth angle phi, two parameter initial setting values are input, a simulation system comprehensive processor generates phase parameters of a sum channel and a difference channel by a computer, channel dynamic parameter data at simulation moments are linked to form a simulation parameter packet, and channel simulation execution head point parameter data are set;

5) Starting simulation and collecting rotation information, and performing closed-loop feedback loop iterative updating; the measured piece receives the beacon analog signal, drives the measured capturing and collecting system to rotate, acquires the rotating angle of the satellite through the comprehensive processor computer, and forms a target deviation angle theta and an azimuth angle phi of an angle error vector of the next analog point according to the rotating angle and the initial value of the initial point parameter;

6) Repeating the step 4) to generate a channel simulation parameter packet at the current moment, downloading the channel simulation parameter packet to a channel simulator and driving the channel simulator to execute, and repeating the steps in a reciprocating way;

7) And receiving the beacon analog signal in real time through the calibration and monitoring equipment, and monitoring the radio frequency and amplitude characteristics of the beacon analog signal in real time.