CN113949437A - A relay capture and field test simulation system and method based on channel simulation technology - Google Patents
A relay capture and field test simulation system and method based on channel simulation technology Download PDFInfo
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Abstract
A relay tracking outfield test simulation system and method based on a channel simulation technology are disclosed, wherein three channel simulation parameters of attenuation, phase and frequency of a tracking beacon signal are extracted based on a single pulse tracking principle; the auxiliary computer comprehensively processes and controls the signals and constructs a signal amplitude model of the tracking beacon according to the sum and difference signal directional diagram characteristics of the relay antenna; the method comprises the steps of reversely calculating the phases of a tracking beacon and a difference signal according to a preset angle, correcting zero value data of a simulation system to form a current-time simulation parameter, adding frequency offset, driving a channel simulator to update three coherent parameters in real time, performing reciprocating operation, and receiving real-time feedback information of an actual corner of a satellite relay tracking system through the simulation system to achieve closed-loop dynamic simulation of the tracking beacon signal in a relay tracking outfield test scene; the invention realizes high-fidelity simulation of the beacon signals of the tracking system, can meet the requirement of multipurpose application, and is suitable for the application of a single-pulse tracking system angle measuring system.
Description
Technical Field
The invention relates to a relay tracking outfield test simulation system and method based on a channel simulation technology, and belongs to the technical field of relay tracking systems.
Background
In order to ensure the verification of the system performance, the relay catch-and-catch system usually needs to organize an outfield large-scale test for verification and evaluation. The traditional test method has more objective and actual protruding problems, such as high site requirements (special instruments and equipment such as a wireless special site, a rotary table and a wave absorbing wall are provided), long test period (usually 1-2 weeks), large manpower and material resource investment (multiple personnel for product and test tool preparation and transportation and test assembly management), serious resource use conflict, and particularly, the verification and evaluation of the overall catching and tracking performance of the system are often delayed to an outfield test stage, only qualitative functional performance test verification can be carried out at a single machine and subsystem wired stage, so that partial index out-of-tolerance risks cannot be exposed as early as possible, and the early correction is often carried out, and great pressure is brought to the model subsequent development progress. The relay catch-and-follow system outfield test has the objective reality of high cost, long period, labor consumption, difficult implementation and the like, and seriously restricts the system development cost and progress.
A design method for a single-channel single-pulse system self-tracking signal source is disclosed in patent No. CN200910175496.5, which adopts complex baseband processing equipment to generate a modulation signal as a beacon signal, and only simulates Doppler frequency and angular error voltage for the beacon signal, but does not simulate phase and signal amplitude characteristics, and the simulation has insufficient high fidelity comprehensiveness. In addition, the simulation system and the system to be tested have no interaction, belong to an open-loop system, and cannot be tightly coupled with the system to be tested.
Method and device for testing mobile radio devices by means of static channel simulation, patent No. CN102204135B, which is mainly directed to channel simulation for wireless testing of communication systems, and the simulation is limited to static channels only, and it is not possible to realize a simulation of the near real-time dynamic characteristics of the channels.
Disclosure of Invention
The technical problem solved by the invention is as follows: a relay capture and external field test simulation system and method based on a channel simulation technology are provided, three channel parameters including Doppler frequency, phase and amplitude of a tracking signal of a single-pulse single-channel tracking system are extracted, and high-fidelity simulation of a beacon signal is realized by applying the channel simulation technology; and the auxiliary computer comprehensively processes and controls, the simulation system collects and receives the rotation angle information of the tested system, and circularly updates the iterative channel simulation state after processing and calculation, so that the dynamic near-real-time simulation under the condition that the simulation system is tightly coupled with the tested system is realized. The method has high application value in large-scale tests of equivalent replacement of relay tracking outfield.
The technical scheme of the invention is as follows: a relay capturing and tracking outfield test simulation system based on a channel simulation technology 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 beacon intermediate frequency RF signal and providing a uniform frequency reference REF signal for other radio frequency equipment in the system;
the channel simulator receives two paths of signals of the acquisition beacon IF, receives control parameter information sent by the comprehensive processing computer, completes three coherent characteristics of signal amplitude, phase and frequency of a sum branch and a difference branch on intermediate frequency, and applies channel simulation to the beacon signals to realize high-fidelity simulation;
the comprehensive processing computer completes comprehensive control and processing of the simulation system through the local area network, calculates and processes a channel simulation parameter set according to system configuration basic data, and drives a channel simulator; collecting the feedback rotation angle data of the tested system to form a tightly coupled closed-loop connection between the tested system and the simulation system; analyzing and processing the feedback corner data, generating a control parameter group of a next time signal simulator and driving the control parameter group to execute so as to achieve near real-time dynamic characteristic simulation;
the calibration and monitoring equipment generates calibration signals, the calibration signals enter the analog system through the input coupler, and the calibration signals are received back through the output coupler to finish initial state calibration of the analog system; receiving beacon analog signals and monitoring the quality of the analog signals in the working process of a system;
the channel microwave component branches the beacon of the beacon frequency source into a sum-difference beacon, changes the frequency of the radio frequency input and output of the channel simulator, and provides a calibration and monitoring channel for calibration and monitoring equipment through coupling.
A 10MHz high-stability crystal oscillator module is arranged in the beacon frequency source, and a beacon RF signal is generated by amplifying a high-stability crystal oscillator output signal through a phase-locked loop; meanwhile, a 10MHz shunt circuit of the high-stability crystal oscillator is generated to generate a uniform reference signal REF inside the system, and high-precision and high-stability isogenization is achieved inside the system.
The beacon signal generated by the beacon frequency source is a single carrier signal.
The channel simulator receives two paths of signals of the acquisition beacon IF, receives control parameter information sent by the comprehensive processing computer, completes channel simulation on three characteristics of signal amplitude, phase and frequency of the sum branch and the difference branch at the intermediate frequency, and realizes high-fidelity simulation of the beacon signals.
The comprehensive processing computer completes dynamic real-time control on the simulation system, collects angle data fed back from the outside, analyzes and processes data at the current moment, generates and downloads control parameters of the simulator at the next moment, drives the dynamic real-time update of the channel simulator, realizes comprehensive control and dynamic operation of the simulation system, and forms closed-loop connection between the tested system and the simulation system. The comprehensive processing calculation is communicated with other equipment through a Local Area Network (LAN) interface to control the working state and parameters of each component equipment in the simulation system.
The comprehensive processing computer adopts an asynchronous 422 serial port to communicate with the ground detection equipment of an external tested system.
The calibration and monitoring equipment generates calibration signals, the calibration signals enter the analog system through the input coupler and are received back through the output coupler, initial state calibration of the analog system is completed by means of the calibration signals, and zero-value parameters are obtained; and in the working process of the system, receiving beacon analog signals, and monitoring the amplitude and frequency radio frequency characteristics of the analog signals in real time.
The channel microwave part comprises a splitter, an input test coupler, frequency conversion equipment and an input/output test coupler; the splitter adopts a Wilkinson bridge to divide the intermediate frequency IF signals of the capture and follow beacons sent from the preceding stage into two paths with equal amplitude and the like, and the equivalent capture and follow beacon signals are split into beacons, branch signals and beacon difference branch signals; the input test coupler is used for coupling and inputting calibration signals of the calibration and monitoring equipment into the splitter; the frequency conversion equipment converts the radio frequency RF beacon signal into an intermediate frequency IF and outputs the intermediate frequency IF to the channel simulator; and converting the two branch signals with the superposed channel characteristics from the intermediate frequency IF to radio frequency RF for transmission. The output test coupler respectively couples and outputs branch signals of which the front stage is changed into radio frequency, and feeds back the branch signals to the calibration and monitoring equipment in a closed loop manner.
The sum-difference two-path output test coupler has high time delay consistency, and the output section waveguide adopts waveguide components with equal length.
A relay capture external field test simulation method based on a channel simulation technology comprises the following steps:
1) calibrating a zero-value parameter by the simulation system, and calibrating the initial parameter of the channel of the simulation system by using calibration and monitoring equipment to obtain the zero-value parameter of the simulation system;
2) simulating system basic data configuration and input; configuring basic data of the simulation system and dynamic parameters of a simulation channel into a comprehensive processing computer of the simulation system, wherein the basic data comprises system null parameters and antenna and difference directional diagram curves; the simulated channel dynamic parameters comprise space link dynamic characteristic parameter Doppler frequency and channel amplitude fluctuation;
3) generating an output original beacon signal; a beacon frequency source generates a beacon signal, and a sum beacon original signal and a difference beacon original signal are formed through shunting;
4) setting an initial value of a first point simulation angle error vector signal; under a pointing coordinate system, an angle error vector signal is represented by a target deviation angle theta and an azimuth angle phi, two initial parameter setting values are input, a computer of a simulation system comprehensive processor generates phase parameters of a sum channel and a difference channel, dynamic parameter data of the channel at a simulation moment are linked to form a simulation parameter packet, and initial parameter data of channel simulation execution are set;
5) starting simulation and collecting rotation information to carry out closed loop feedback loop iterative updating; the measured piece receives the simulated beacon signal and drives the measured capturing and tracking system to rotate, the working and rotating angle of the satellite is collected by the computer of the comprehensive processor, and a target deviation angle theta and an azimuth angle phi of an angular error vector of a next simulation point are formed according to the working and rotating angle of the satellite and the initial value of the initial point parameter;
6) repeating the step 4) to generate a channel simulation parameter package at the current moment, downloading the channel simulation parameter package to a channel simulator and driving to execute, and repeating the steps;
7) receiving an analog signal in real time through calibration and monitoring equipment, and monitoring the radio frequency and amplitude characteristics of the analog signal in real time;
8) and (4) the simulation system operates for 4-5 hours, and zero value calibration is performed on the system again on the premise that the simulation service is allowed to be interrupted, and the condition that the system zero value does not fluctuate greatly is confirmed.
Compared with the prior art, the invention has the advantages that:
(1) the invention is based on the channel simulation technology, can simultaneously realize the application of channel simulation to three coherent characteristics of signal amplitude, phase and frequency of a sum branch and a difference branch, and realizes high-fidelity simulation of beacon signals;
(2) the invention utilizes the computer comprehensive processing technology to comprehensively control and process the simulation system, collects the feedback rotation angle data of the tested system, realizes the close coupling closed-loop connection of the tested system and the simulation system, and forms a closed-loop feedback system; analyzing and processing the feedback corner data, generating a control parameter group of a next time signal simulator and driving the control parameter group to execute so as to achieve near real-time dynamic characteristic simulation; the corner feedback information of the system to be tested is disconnected, and the analog system can also support open-loop work;
(3) the core of the system is the simulation of the tracking signal, the simulation can be the simulation parameters generated according to the simulation of an objective actual physical scene, certain customized simulation curves are supported, the respective simulation parameters can be formed according to a theoretical formula aiming at the requirements of certain boundary performance, extreme working scenes and performance quantitative analysis of the relay tracking system, and the system can be comprehensively and deeply evaluated by combining an open-loop mode and a closed-loop mode.
Drawings
Fig. 1 is a relay catch external field test simulation system.
Fig. 2 shows a typical application of the relay capture and external field test simulation system.
Fig. 3 is a schematic diagram of the pointing target and the offset vector in the antenna coordinate system.
Fig. 4 antenna and beam pattern.
Fig. 5 antenna difference beam pattern.
FIG. 6 is a diagram of a computer work flow for the integrated processing of a simulation system.
FIG. 7 is a calibration of a relay capture and external field test simulation system.
Fig. 8422 illustrates a bus angle transfer data format.
Detailed Description
A relay acquisition and external field test simulation system and method based on a channel simulation technology belong to the technical field of satellite relay system acquisition and tracking. Based on the single pulse tracking principle, three channel simulation parameters of attenuation, phase and frequency of the capture beacon signal are extracted; according to the sum and difference signal directional diagram characteristics of the relay antenna, a signal amplitude model of the tracking beacon is constructed, the theoretical angle tracked by the antenna is mapped to the phase and frequency deviation, the auxiliary computer comprehensively processes and controls the signal amplitude model, the simulation system receives the real-time feedback of the actual rotation angle of the satellite relay tracking system, the parameter value of the tracking beacon signal is inversely calculated according to the single-pulse tracking angle measurement principle, zero value data of the simulation system is corrected to form a current-time simulation parameter, a driving channel simulator updates three coherent parameters in real time and operates in a reciprocating mode, and dynamic simulation of the tracking beacon signal in a relay tracking outfield test scene is achieved through closed-loop information feedback; the system is provided with calibration and monitoring equipment, and zero values of the analog system can be calibrated in the application process, so that the working state of the system can be monitored.
The invention relates to a relay capturing and outfield test simulation system based on a channel simulation technology, which comprises a beacon frequency source, a channel simulator, calibration and monitoring equipment, a comprehensive processing computer and a channel microwave component, wherein the beacon frequency source is connected with the channel simulator;
the beacon frequency source is used for generating a beacon intermediate frequency RF signal and providing a uniform frequency reference REF signal for other radio frequency equipment in the system;
the channel simulator receives two paths of signals of the acquisition beacon IF, receives control parameter information sent by the comprehensive processing computer, completes three coherent characteristics of signal amplitude, phase and frequency of a sum branch and a difference branch on intermediate frequency, and applies channel simulation to the beacon signals to realize high-fidelity simulation;
the comprehensive processing computer completes comprehensive control and processing of the simulation system through the local area network, calculates and processes a channel simulation parameter set according to system configuration basic data, and drives a channel simulator; collecting the feedback rotation angle data of the tested system to form a tightly coupled closed-loop connection between the tested system and the simulation system; analyzing and processing the feedback corner data, generating a control parameter group of a next time signal simulator and driving the control parameter group to execute so as to achieve near real-time dynamic characteristic simulation;
the calibration and monitoring equipment generates calibration signals, the calibration signals enter the analog system through the input coupler, and the calibration signals are received back through the output coupler to finish initial state calibration of the analog system; receiving beacon analog signals and monitoring the quality of the analog signals in the working process of a system;
the channel microwave component branches the beacon of the beacon frequency source into a sum-difference beacon, changes the frequency of the radio frequency input and output of the channel simulator, and provides a calibration and monitoring channel for calibration and monitoring equipment through coupling.
A 10MHz high-stability crystal oscillator module is arranged in the beacon frequency source, and a beacon RF signal is generated by amplifying a high-stability crystal oscillator output signal through a phase-locked loop; meanwhile, a 10MHz shunt circuit of the high-stability crystal oscillator is generated to generate a uniform reference signal REF inside the system, and high-precision and high-stability isogenization is achieved inside the system.
The beacon signal generated by the beacon frequency source is a single carrier signal.
The channel simulator receives two paths of signals of the acquisition beacon IF, receives control parameter information sent by the comprehensive processing computer, completes channel simulation on three characteristics of signal amplitude, phase and frequency of the sum branch and the difference branch at the intermediate frequency, and realizes high-fidelity simulation of the beacon signals.
The comprehensive processing computer completes dynamic real-time control on the simulation system, collects angle data fed back from the outside, analyzes and processes data at the current moment, generates and downloads control parameters of the simulator at the next moment, drives the dynamic real-time update of the channel simulator, realizes comprehensive control and dynamic operation of the simulation system, and forms closed-loop connection between the tested system and the simulation system. The comprehensive processing calculation is communicated with other equipment through a Local Area Network (LAN) interface to control the working state and parameters of each component equipment in the simulation system.
The comprehensive processing computer adopts an asynchronous 422 serial port to communicate with the ground detection equipment of an external tested system.
The calibration and monitoring equipment generates calibration signals, the calibration signals enter the analog system through the input coupler and are received back through the output coupler, initial state calibration of the analog system is completed by means of the calibration signals, and zero-value parameters are obtained; and in the working process of the system, receiving beacon analog signals, and monitoring the amplitude and frequency radio frequency characteristics of the analog signals in real time.
The channel microwave part comprises a splitter, an input test coupler, frequency conversion equipment and an input/output test coupler; the splitter adopts a Wilkinson bridge to divide the intermediate frequency IF signals of the capture and follow beacons sent from the preceding stage into two paths with equal amplitude and the like, and the equivalent capture and follow beacon signals are split into beacons, branch signals and beacon difference branch signals; the input test coupler is used for coupling and inputting calibration signals of the calibration and monitoring equipment into the splitter; the frequency conversion equipment converts the radio frequency RF beacon signal into an intermediate frequency IF and outputs the intermediate frequency IF to the channel simulator; and converting the two branch signals with the superposed channel characteristics from the intermediate frequency IF to radio frequency RF for transmission. The output test coupler respectively couples and outputs branch signals of which the front stage is changed into radio frequency, and feeds back the branch signals to the calibration and monitoring equipment in a closed loop manner.
The sum-difference two-path output test coupler has high time delay consistency, and the output section waveguide adopts waveguide components with equal length.
The present invention will be described in detail below with reference to the accompanying drawings.
Fig. 1 is a block diagram of a relay capture and outfield test simulation system, which mainly comprises a beacon frequency source, a channel simulator, calibration and monitoring equipment, a comprehensive processing computer and a channel microwave component. The comprehensive processing computer realizes network data communication with each functional device through the LAN interface of the comprehensive test network, and completes the comprehensive control of the system. All microwave component devices are homologous to a reference signal of a beacon frequency source, and output ports of the input test coupler and the output test coupler are connected to calibration and monitoring equipment. The analog system has 3 interfaces to the outside: 2 waveguide interfaces are used for outputting equivalent analog beacons of the sum branch and the difference branch, and 1 waveguide interface 422 is used for collecting and receiving corner information of a tested system.
Fig. 2 shows a typical application of the present invention, and the specific device selection is as follows: the beacon frequency source adopts a German analog signal source with the model number of E8257D; the channel simulator selects a KSW-WNS02/02B channel simulator of the national KunHengshun Wiegmann company, is a dual-channel simulator, directly supports millimeter wave frequency band channel simulation test through internal board card extension, has excellent multi-channel phase consistency, realizes 100ps high-precision time delay simulation, and supports the maximum bandwidth of 500 MHz. Due to the up-down frequency conversion component built in the channel simulator, the interrupt frequency conversion equipment of the original simulation system architecture can be replaced. The comprehensive processing computer adopts a Hua industrial personal computer with the model of IPC-610-L. The splitter is a self-developed Wilkinson 3dB power split bridge, the input test coupler is a coaxial coupler, the output test coupler is a coaxial waveguide interface coupler, the coupling degree is 10dB, and the waveguide interface is BJ 260. The calibration and monitoring equipment adopts the vector network analysis of Germany, has the model number of N5247 and is provided with 4 ports. The measured system is a satellite relay capturing and tracking system, the satellite equipment mainly comprises a tracking receiver and a terminal controller, an antenna mechanism equivalent device is used for equivalently replacing an on-satellite mechanical rotating antenna, the terminal controller drives the antenna mechanism equivalent device to rotate according to angular error information of the tracking receiver, and the antenna mechanism equivalent device outputs angular information to the outside through a 422 interface after collecting the angular information through rotation high precision while rotating.
A list of instruments typically used is shown in table 1 below.
TABLE 1 exemplary applications of the System simulation System configuration List
The system simulation principle is as follows:
according to the study and implementation of "demodulation technique of angular error signal" by Tan Tun of authors at Nanjing university of science and technology "Master thesis, as shown in FIG. 3, in the antenna coordinate system, the rotation angle α X of the azimuth axis and the rotation angle α y of the pitch axis of the antenna, the included angle θ of the target pointing direction deviating from the antenna electrical axis and the included angle between the projection line of the XOY plane of the antenna coordinate system and the X axis
Wherein the included angle
The angle between the difference signal composite vector and the orientation vector, and the four parameters have theoretical mathematical relations:
according to classical single-channel single-pulse angle tracking theory, as shown in fig. 4 and 5, in the research on single-channel single-pulse angle tracking system of the third phase of the reference telecommunication technology 2005, a beacon signal is transmitted through space to reach the mouth surface of a tracking antenna, and forms a 1-path sum signal S through the tracking antenna∑And 1 way difference signal SΔWherein the difference branch signal is the azimuth differenceSΔADifference from pitch SΔEOrthogonal signal vector synthesis, for a tracking receiver, the input signals sent by the antenna are:
in the above formula, theta is the space angle of the target deviation electric axis, and the difference signal vector angle
In order to sum the signal antenna pattern,
is a difference signal antenna pattern, fdopplerThe Doppler shift introduced by the relative motion between the satellites, and alpha is the relative phase difference of the antenna and the difference channel phase inconsistency.
1) Channel parameter extraction
As can be seen from the formula of the sum and difference signals sent from the antenna output terminals, the channel characteristics involved in the sum and difference signals input to the tracking receiver mainly include: sum signal antenna gain G∑Gain G of differential signal antennaΔDoppler shift fdopplerDifferential signal vector angle
And the sum-difference channel phase inconsistency phase difference alpha, define
Is the total change in phase. The above parameters correspond to 3 parameters of amplitude, frequency and phase of the channel, respectively.
2) Signal simulation parameter generation
For the relay tracking system, based on the initial positions (X0, Y0), the included angle theta of the electric axis of the deviated antenna and the included angle of the difference signal vector can be calculated and obtained through the rotation angles (Xa and Ya) of the axes of the antennas X, Y respectively
According to theta and
by looking up the antenna pattern gain curve value and setting the Doppler frequency fdopplerAnd correcting initial zero-value parameters of the simulation system, setting the channel parameters to a channel simulator, and equivalently realizing high-fidelity simulation of the relay tracking beacon signals through accurate simulation of the 3 channel parameters.
3) Simulation system closed loop dynamics
The angle information of the working of the tested system 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, a closed-loop mechanism of the tested system and the simulation system is formed, and the dynamic real-time effect is achieved.
The system work flow is as follows:
1) calibrating zero-value parameters of the analog system, calibrating initial parameters of a channel of the analog system by using calibration and monitoring equipment, and acquiring zero-value parameters of phase differences of sum and difference channels of the analog system
A zero value parameter a0 for the sum amplitude difference;
2) simulating system basic data configuration and input; configuring basic data of the simulation system and dynamic parameters of a simulation channel into a comprehensive processing computer of the simulation system, wherein the basic data comprises system null parameters and antenna and difference directional diagram curves; the simulated channel dynamic parameters comprise space link dynamic characteristic parameter Doppler frequency and channel amplitude fluctuation;
TABLE 2 System simulation parameter set configuration Table example
3) Generating an output original beacon signal; the beacon frequency source generates a beacon signal, and a sum and difference beacon original signal is formed through shunting, wherein the beacon signal of the present example is 23.54 GHz;
4) setting an initial value of a first point simulation angle error vector signal; setting initial position angles (alpha X0, alpha Y0) of an X axis and a Y axis under a pointing coordinate system, calculating a target deviation angle theta and an azimuth angle phi of an angle error vector by a simulation system comprehensive processing computer according to point parameters, extracting antenna directional diagram gain G and Doppler frequency f at the same time, generating simulation parameter groups of a sum channel and a difference channel, linking dynamic parameter data of the channel at a simulation moment to form a simulation parameter packet, and transmitting the parameter data to a channel simulator;
5) starting simulation, starting simulation work by a channel simulator, and carrying out closed-loop feedback loop iterative update through a 422 interface; the tested piece receives the simulated beacon signal, drives the tested capturing and tracking system to rotate, the comprehensive processing computer collects the rotation angles (alpha X, alpha Y) of the X axis and the Y axis of the antenna mechanism equivalent device, the rotation angles are collected through the comprehensive processing computer, and the parameter generating process in the step 4) is repeated; the detailed workflow of the integrated processing computer is shown in fig. 6.
6) Repeating the step 4) to generate a channel simulation parameter package at the current moment, downloading the channel simulation parameter package to a channel simulator and driving to execute, and repeating the steps;
7) receiving an analog signal in real time through calibration and monitoring equipment, and monitoring the radio frequency and amplitude characteristics of the analog signal in real time;
the normal use of the system calibration system is crucial, the calibration schematic diagram is shown in fig. 7, and the attenuation and phase of the sum branch and the phase of the difference branch are respectively obtained through calibration and are used as system zero-value parameters to compensate and correct system deviation.
The 422 interface adopts an asynchronous 422 bus, is an international standard of a full-duplex serial bus, and can realize a serial data bus of point-to-point communication. The data transmission is realized by using 1 pair of differential signals, and the transmission rate is set to be 500Kbps, 1 bit start bit, 1 bit stop bit and 1 bit even check in the system. Fig. 8 shows a 422 bus transfer packet format.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention, and those skilled in the art can make modifications and variations of the present invention without departing from the spirit and scope of the present invention.
Claims (10)
1. A relay capture external field 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 beacon intermediate frequency RF signal and providing a uniform frequency reference REF signal for other radio frequency equipment in the system;
the channel simulator receives two paths of signals of the acquisition beacon IF, receives control parameter information sent by the comprehensive processing computer, completes three coherent characteristics of signal amplitude, phase and frequency of a sum branch and a difference branch on intermediate frequency, and applies channel simulation to the beacon signals to realize high-fidelity simulation;
the comprehensive processing computer completes comprehensive control and processing of the simulation system through the local area network, calculates and processes a channel simulation parameter set according to system configuration basic data, and drives a channel simulator; collecting the feedback rotation angle data of the tested system to form a tightly coupled closed-loop connection between the tested system and the simulation system; analyzing and processing the feedback corner data, generating a control parameter group of a next time signal simulator and driving the control parameter group to execute so as to achieve near real-time dynamic characteristic simulation;
the calibration and monitoring equipment generates calibration signals, the calibration signals enter the analog system through the input coupler, and the calibration signals are received back through the output coupler to finish initial state calibration of the analog system; receiving beacon analog signals and monitoring the quality of the analog signals in the working process of a system;
the channel microwave component branches the beacon of the beacon frequency source into a sum-difference beacon, changes the frequency of the radio frequency input and output of the channel simulator, and provides a calibration and monitoring channel for calibration and monitoring equipment through coupling.
2. The relay capture external field test simulation system based on the channel simulation technology as claimed in claim 1, wherein: a 10MHz high-stability crystal oscillator module is arranged in the beacon frequency source, and a beacon RF signal is generated by amplifying a high-stability crystal oscillator output signal through a phase-locked loop; meanwhile, a 10MHz shunt circuit of the high-stability crystal oscillator is generated to generate a uniform reference signal REF inside the system, and high-precision and high-stability isogenization is achieved inside the system.
3. The relay capture external field test simulation system based on the channel simulation technology as claimed in claim 1, wherein: the beacon signal generated by the beacon frequency source is a single carrier signal.
4. The relay capture external field test simulation system based on the channel simulation technology as claimed in claim 1, wherein: the channel simulator receives two paths of signals of the acquisition beacon IF, receives control parameter information sent by the comprehensive processing computer, completes channel simulation on three characteristics of signal amplitude, phase and frequency of the sum branch and the difference branch at the intermediate frequency, and realizes high-fidelity simulation of the beacon signals.
5. The relay capture external field test simulation system based on the channel simulation technology as claimed in claim 1, wherein: the comprehensive processing computer completes dynamic real-time control on the simulation system, collects angle data fed back from the outside, analyzes and processes data at the current moment, generates and downloads control parameters of the simulator at the next moment, drives the dynamic real-time update of the channel simulator, realizes comprehensive control and dynamic operation of the simulation system, and forms closed-loop connection between the tested system and the simulation system. The comprehensive processing calculation is communicated with other equipment through a Local Area Network (LAN) interface to control the working state and parameters of each component equipment in the simulation system.
6. The relay capture external field test simulation system based on the channel simulation technology as claimed in claim 1, wherein: the comprehensive processing computer adopts an asynchronous 422 serial port to communicate with the ground detection equipment of an external tested system.
7. The relay capture external field test simulation system based on the channel simulation technology as claimed in claim 1, wherein: the calibration and monitoring equipment generates calibration signals, the calibration signals enter the analog system through the input coupler and are received back through the output coupler, initial state calibration of the analog system is completed by means of the calibration signals, and zero-value parameters are obtained; and in the working process of the system, receiving beacon analog signals, and monitoring the amplitude and frequency radio frequency characteristics of the analog signals in real time.
8. The relay capture external field test simulation system based on the channel simulation technology as claimed in claim 1, wherein: the channel microwave part comprises a splitter, an input test coupler, frequency conversion equipment and an input/output test coupler; the splitter adopts a Wilkinson bridge to divide the intermediate frequency IF signals of the capture and follow beacons sent from the preceding stage into two paths with equal amplitude and the like, and the equivalent capture and follow beacon signals are split into beacons, branch signals and beacon difference branch signals; the input test coupler is used for coupling and inputting calibration signals of the calibration and monitoring equipment into the splitter; the frequency conversion equipment converts the radio frequency RF beacon signal into an intermediate frequency IF and outputs the intermediate frequency IF to the channel simulator; and converting the two branch signals with the superposed channel characteristics from the intermediate frequency IF to radio frequency RF for transmission.
The output test coupler respectively couples and outputs branch signals of which the front stage is changed into radio frequency, and feeds back the branch signals to the calibration and monitoring equipment in a closed loop manner.
9. The relay capture external field test simulation system based on the channel simulation technology as claimed in claim 1, wherein: the sum-difference two-path output test coupler has high time delay consistency, and the output section waveguide adopts waveguide components with equal length.
10. A relay capture external field test simulation method based on a channel simulation technology is characterized by comprising the following steps:
1) calibrating a zero-value parameter by the simulation system, and calibrating the initial parameter of the channel of the simulation system by using calibration and monitoring equipment to obtain the zero-value parameter of the simulation system;
2) simulating system basic data configuration and input; configuring basic data of the simulation system and dynamic parameters of a simulation channel into a comprehensive processing computer of the simulation system, wherein the basic data comprises system null parameters and antenna and difference directional diagram curves; the simulated channel dynamic parameters comprise space link dynamic characteristic parameter Doppler frequency and channel amplitude fluctuation;
3) generating an output original beacon signal; a beacon frequency source generates a beacon signal, and a sum beacon original signal and a difference beacon original signal are formed through shunting;
4) setting an initial value of a first point simulation angle error vector signal; under a pointing coordinate system, an angle error vector signal is represented by a target deviation angle theta and an azimuth angle phi, two initial parameter setting values are input, a computer of a simulation system comprehensive processor generates phase parameters of a sum channel and a difference channel, dynamic parameter data of the channel at a simulation moment are linked to form a simulation parameter packet, and initial parameter data of channel simulation execution are set;
5) starting simulation and collecting rotation information to carry out closed loop feedback loop iterative updating; the measured piece receives the simulated beacon signal and drives the measured capturing and tracking system to rotate, the working and rotating angle of the satellite is collected by the computer of the comprehensive processor, and a target deviation angle theta and an azimuth angle phi of an angular error vector of a next simulation point are formed according to the working and rotating angle of the satellite and the initial value of the initial point parameter;
6) repeating the step 4) to generate a channel simulation parameter package at the current moment, downloading the channel simulation parameter package to a channel simulator and driving to execute, and repeating the steps;
7) receiving an analog signal in real time through calibration and monitoring equipment, and monitoring the radio frequency and amplitude characteristics of the analog signal in real time;
8) and (4) the simulation system operates for 4-5 hours, and zero value calibration is performed on the system again on the premise that the simulation service is allowed to be interrupted, and the condition that the system zero value does not fluctuate greatly is confirmed.
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