CN111158263A - Infield simulation intermediate control system and implementation method - Google Patents
Infield simulation intermediate control system and implementation method Download PDFInfo
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Abstract
The invention discloses an infield simulation middleware control system and an implementation method thereof, which can flexibly, universally and vividly simulate the complex electromagnetic environment of a battlefield faced by a missile weapon by using output signals of devices such as an infield actual-mounted interference device or an interference simulator and the like as input excitation signals and modulating the power, time delay and Doppler of the input signals according to equivalent scene trajectory information to generate final interference signals. The method has strong operability and practicability, plays an important role in the adaptability test, performance evaluation and shaping of the complex electromagnetic environment of the missile weapon, and has high practical value.
Description
Technical Field
The invention belongs to the field of internal field test simulation of a complex electromagnetic environment of a missile weapon, and particularly relates to an internal field simulation intermediate control system and an implementation method.
Background
In a modern battlefield, electronic countermeasures play a very important role, electronic information equipment has the characteristics of large quantity, complex system and various types on the battlefield, and the information equipment of both the enemy and the my party is densely deployed and fiercely countermeasures against the countermeasures, so that a complex electromagnetic environment is formed, and the fighting efficiency of the missile weapons with radar signal systems is greatly influenced. In order to meet the objective requirements of modern high-technology wars in new situations and improve the adaptability of missile weaponry in complex electromagnetic environments, particularly the anti-interference capability of electronic countermeasure environments, the complex electromagnetic environments of a battlefield need to be vividly simulated, and anti-interference tests are carried out on own weaponry in the complex electromagnetic environments so as to ensure that the missile weaponry can adapt to the electromagnetic environments of the battlefield to the maximum extent.
At present, aiming at the operational requirements of missile weapons at home and abroad, a plurality of internal and external field test bases are established for the test identification work of missile weaponry. However, the testing resources of the external field testing base are limited, the testing cost is high, the resource consumption is large, and the tests of a large number of samples cannot be performed, so that the trend of the current development is to construct a vivid electromagnetic environment in an internal field darkroom and place a missile weapon system in the electromagnetic environment for performance evaluation. The test field inner field provides a test environment for the missile weapon, meets the authenticity and effectiveness requirements of electronic equipment test identification, and is a difficult problem faced by the test field.
The full-length clues that the domestic and foreign infield simulation test system adopts a semi-physical simulation method and simulates the electronic warfare signal environment on a real frequency band through various signal environment simulation devices in the text of 'the effect and the development of the infield simulation test'. The full-up clue indicates that the types of electronic warfare equipment are various, and the fidelity of signals generated by the developed semi-physical simulator influences the authenticity and reliability of the internal field simulation test result to a certain extent.
Disclosure of Invention
The invention aims to provide an internal field simulation middleware control system and an implementation method, which solve the problems of universality and fidelity of an electromagnetic environment of an internal field simulation test.
The technical solution for realizing the purpose of the invention is as follows: an infield simulation middleware control system comprises a main control unit, a receiving unit, a digital simulation unit, a digital assembly, a transmitting unit and an output unit. A method for realizing an internal field simulation middleware control system is mainly characterized in that a radio frequency signal generated by external field actual equipment is used as an input signal, and then the input signal is modulated and processed according to a confrontation scene and then output to an antenna array to be radiated towards a seeker. The implementation method mainly comprises the following steps:
and step 1, the main control unit sets interference initial parameters and sends the interference initial parameters to the digital simulation unit through a serial port. The main parameters of the interference initial parameters comprise an interference type, an interference pattern, a working mode, a working frequency band and the like.
And 2, the main control unit sends information such as the distance, the speed, the position and the like between the missile and the interference to the digital simulation unit in real time according to the ballistic information, and the information is resolved into parameters required by signal modulation.
And 3, releasing the interference signal by the actual equipment, controlling the receiving unit of the system by the middleware to complete the signal receiving and sensitivity control, generating a video pulse by the detector, and simultaneously carrying out down-conversion on the signal to a frequency band required by frequency measurement and frequency storage.
And 4, the digital component stores, delays and copies the signal after the down-conversion according to the resolved information, and performs Doppler modulation to generate a baseband interference signal in the current countermeasure scene.
And 5, the transmitting unit up-converts the baseband interference signal processed by the digital assembly to the working frequency band of the signal received by the receiving unit.
And 6, amplifying and outputting the up-conversion signal by the output unit through the four-way three-stage power amplifier, and realizing harmonic suppression through the digital attenuator and the medium-low pass filter to generate a final interference radio frequency signal.
Compared with the prior art, the invention has the remarkable advantages that: 1) the infield simulation middleware control system has universality and convenient deployment, any interference equipment can be used as an input signal for testing, the testing cost can be reduced, and the repeated construction of a test strip is avoided; 2) the middleware control system can directly take the external field actual installation interference equipment as an input signal, and the output signal has higher fidelity and can reflect the performance of the equipment more truly; 3) the middleware control system modulates the interference signal in real time according to the trajectory information, and can equivalently simulate the actual combat environment of the missile weapon in an inner field.
Drawings
FIG. 1 is a block diagram of the control system of infield simulation middleware according to the present invention.
FIG. 2 is a flow chart of the process of the infield simulation middleware control system receiving unit according to the present invention.
Detailed Description
The present invention is described in further detail below with reference to the attached drawing figures.
With reference to fig. 1 and 2, the infield simulation middleware control system includes a main control unit, a receiving unit, a digital simulation unit, a digital component, a transmitting unit, and an output unit, where the main control unit, the digital simulation unit, the digital component, the transmitting unit, and the output unit are sequentially connected, and the digital component is respectively connected to the receiving unit, the transmitting unit, and the output unit.
The main control unit sets interference initial parameters and sends the parameters to the digital simulation unit through a serial port; the digital simulation unit sorts, analyzes and simulates the received signal parameters and then sends simulation data to the digital assembly; the receiving unit finishes the receiving and sensitivity control of signals, the detector generates video pulses, and the signals are down converted to frequency bands required by frequency measurement and frequency storage and transmitted to the digital component; the digital component stores, delays and copies the signal after the down-conversion according to the resolved information, performs Doppler modulation, generates a baseband signal under the current confrontation scene, and transmits the baseband signal to the transmitting unit; the transmitting unit up-converts the baseband signal processed by the digital assembly to the working frequency band of the signal received by the receiving unit and transmits the working frequency band to the output unit; the output unit amplifies and outputs the up-conversion signal output by the transmitting unit through the four-path three-level power amplifier, and harmonic suppression is realized through the digital attenuator and the medium-low pass filter to generate a final interference radio frequency signal.
The implementation method of the infield simulation middleware control system comprises the following specific steps:
step 1, setting interference initial parameters, wherein the interference initial parameters comprise interference patterns (deception interference and suppression interference), interference types (foil strip interference, radar decoy interference and active interference), interference equipment initial parameters (output power of a mounting interference equipment, antenna gain of the mounting interference equipment, transmitting power of a seeker, antenna gain of the seeker, distance between an output antenna of an internal field simulation middleware and a tested seeker, feeder loss and polarization loss and antenna gain of the internal field simulation middleware, and the interference equipment is an interference machine or a simulator), and transmitting the interference initial parameters to a digital simulation unit through a high-speed serial port.
And 2, after receiving the interference initial parameters, the digital simulation unit carries out initialization setting and caches the initial parameters in an internal memory of the digital simulation unit.
And 3, after the test is started, the main control unit resolves missile path data information of missile flight, issues the distance, the speed, the position and the RCS information between the missile and the interference equipment to the digital simulation unit in real time, and the digital simulation unit analyzes, calculates and transmits the information to the digital assembly for signal modulation processing.
Step 4, the interference device releases interference signals according to an interference scene, the receiving unit sorts and analyzes the receiving unit, determines the modulation values of the parameters of the carrier frequency, the amplitude, the bandwidth, (the pulse width and the repetition period) of the signals, completes the receiving and the sensitivity control of the input signals, generates video pulses by the detector, and simultaneously down-converts the signals to the frequency bands required by frequency measurement and frequency storage, which is as follows:
and 4-1, after the front end of the receiving unit receives the input signal, performing amplitude limiting and amplification filtering on the signal, and dividing the signal into two paths.
And 4-2, after the signals are divided, dividing one path of signals to a reconnaissance part to finish amplitude detection of the signals and generate amplitude detection pulses and video synchronization pulses, and after the amplitude detection is finished, carrying out sensitivity control on the received signals, ensuring that the middleware simulation control system can normally receive the signals during working through the amplitude control of the received signals, and avoiding excessive signals from entering resources of a receiver channel distributed control system under a complex electromagnetic environment through a sensitivity threshold control measure.
And 4-3, amplifying the other path of signals subjected to power division, then performing power division again into two paths, performing frequency conversion on one path of signals to provide frequency measurement signals, and outputting the other path of signals to a down-conversion unit to down-convert the signals to a frequency range required by radio frequency storage and frequency measurement.
Step 5, the digital assembly receives the control signal transmitted by the digital simulation unit, stores, delays and copies the signal after down conversion, and carries out Doppler modulation to generate an interference signal under the current countermeasure scene, and the specific processing process is completed by the following steps:
step 5-1: when a seeker with a distance measurement function faces interference signals such as deception interference, foil strip interference, bait interference and the like in a battlefield environment, the signals of the seeker are related to the distance between the seeker and an interference device in a ballistic scene, so that during testing, echo delay of a transmitted signal needs to be modified on a digital component part, and the delay is calculated through a formula (1):
in the formula:
t is the delay time of the interference signal, s;
r is the distance between the seeker and the interfering device, m;
c-speed of light, 3X 108m/s。
Step 5-2: according to the position relation between the seeker and the interference equipment in the ballistic scene, Doppler of the internal field simulation middleware needs to be modulated. Conventional modulation of the plerian signal using frequencyThe difference is fdDown-converting and up-converting the signal by two local oscillators to obtain a frequency shift fdThe doppler signal of (1). In order to ensure the pulse coherence of the doppler signals, the local oscillator signals used for up-conversion and down-conversion need to keep continuous phase during a pulse coherent accumulation period of the signals, so that one frequency shift branch can only generate one doppler frequency during one pulse coherent accumulation period. To generate multiple doppler frequencies simultaneously, multiple frequency shift branches need to be used in parallel. The frequency shift branch needs to be realized by using a mixer, a filter and the like, and a large number of microwave devices cause the whole control system to become complicated and have overlarge volume and power consumption. The internal field simulation middleware control system utilizes a high-speed and ultra-large-scale FPGA to realize various modulations on the A/D sampled signal data in a digital domain. The method for realizing the Doppler frequency shift in the digital domain can be operated by the formula (2):
cos[2π(f0+fd)t]＝cos(2πf0t)cos(2πfdt)-sin(2πf0t)sin(2πfdt)…………(2)
in the formula:
f0-input signal carrier frequency, Hz;
fddoppler shift, Hz.
And 6, after the digital component processes the interference signal on the baseband, the signal needs to be up-converted to the working frequency band of the signal received by the receiving unit, and the up-conversion process is actually the reverse process of down-conversion. The signal up-conversion of the transmitting unit is specifically completed by the following steps:
and 6-1, receiving the frequency synthesis control signal generated by the digital assembly by the transmitting unit, selecting different frequency conversion local oscillators, and performing up-conversion on the baseband signal output in the step 5 to a radio frequency band.
And 6-2, receiving the video signal generated by the digital assembly by the transmitting unit, and carrying out video modulation on the up-conversion output signal.
And 7, amplifying and outputting the up-conversion signal by the output unit through the four-way three-stage power amplifier, and realizing harmonic suppression through the digital attenuator and the medium-low pass filter to generate a final interference radio frequency signal. According to different interference patterns and interference types, the power control is also different, and the specific transmission signal power control scaling mode is as follows:
(1) scaling of output power in simulated jamming
In actual combat, the suppressed interference power received by the seeker is calculated according to the formula (3):
in the formula:
Jpressing-during actual combat, the pilot receives a suppressed interference power, W;
Pj-a suppressed interference power, W, emitted by the interfering device;
Gj-the transmit antenna gain, dB, of the interfering device;
Rjthe distance of the interfering device from the seeker, m;
Aeeffective receiving area of the seeker receiving antenna, m2。
During simulation of the internal field, the suppressed interference power received by the tested seeker is calculated according to the formula (4):
in the formula:
J'pressing-during infield simulation, the suppressed interference power, W, received by the seeker under test;
P'j pressing-the suppressed interference power, W, output by the infield simulation middleware control system;
G'j-the antenna gain, dB, of the infield simulation middleware control system;
R'jthe internal field simulation middleware controls the distance, m, between the system antenna and the tested seeker;
Lj-sum of losses of infield simulation middleware control system, including feeder lossesLoss, polarization loss, etc., dB.
Let JPressing＝J'PressingAnd then according to the suppression interference power output by the field simulation middleware control system in the formula (5):
(2) scaling of output power in simulating spoof interference
During inner field simulation, deception interference power changes along with the detected radiation power of the seeker, and constant interference-to-signal ratio requirements are kept. Thus, the power of the spoofed interference received by the seeker under test is calculated according to equation (6):
in the formula:
J'spoofing-deception jamming power, W, received by the seeker under test during infield simulation;
s' — target echo power, W, received by the seeker under test during internal field simulation;
k is the interference-signal ratio, dB required to be achieved at the antenna aperture of the seeker during deception jamming;
P't-the output power of the target simulator, W;
G't-antenna gain, dB, of the target simulator;
r' — the distance, m, of the target simulator transmitting antenna from the seeker under test;
Aeeffective receiving area of the seeker receiving antenna, m2；
L is the loss sum of the target simulator, including feeder loss, polarization loss, etc., dB.
And during inner field simulation, the deception jamming power received by the tested seeker can be calculated according to the formula (7):
in the formula:
P'j spoofingDuring inner field simulation, the inner field simulation middleware controls the deception jamming power W output by the system.
Obtaining the deception jamming power output by the infield simulation middleware control system according to the formula (6) and the formula (7):
(3) scaling of output power in the event of simulated foil strip interference
During actual combat, the foil strip echo power received by the seeker is calculated according to the formula (9):
in the formula:
Pt-the transmitting power of the seeker, W;
Gt-the transmitting antenna gain of the seeker, dB;
Jfoil stripDuring actual combat, foil echo power, W, received by the seeker;
σfoil stripThe radar cross-section of the foil strip, m2；
RFoil stripThe distance of the foil strip from the seeker, m.
During the simulation of the internal field, the foil strip echo power received by the tested seeker is calculated according to the formula (10):
in the formula:
J'foil stripDuring internal field simulation, foil strip echo power W received by the tested seeker;
P'jfoil strip-foil strip interference power, W, output by an internal field simulation middleware control system;
let J'Foil strip＝JFoil stripAnd calculating the interference power of the foil strip of the infield simulation middleware control system according to the formula (11):
(4) radar signal/decoy output power scaling
During actual combat, the radar signal/decoy output power received by the seeker is calculated according to equation (12):
in the formula:
Prthe transmission power of the target radar/decoy, W;
Gr-target radar/decoy transmit antenna gain, dB;
s-radar signal/decoy output power, W, received by seeker during actual combat;
r-distance of target radar/bait from seeker, m.
During infield simulation, the radar signal/bait output power received by the seeker to be tested is calculated according to the formula (13):
in the formula:
s' — target echo power, W, received by the seeker under test during internal field simulation;
Pm-the output power of the infield simulation middleware control system, W;
Gm-the antenna gain, dB, of the infield simulation middleware control system;
r' -the distance between the system antenna and the tested seeker, m, is controlled by the internal field simulation middleware;
let S ═ S, the output power of the infield simulation middleware control system target radar/decoy is calculated according to equation (14):
and after the output unit adjusts the power of the interference radio frequency signal, outputting the signal to generate an interference analog signal under the current scene.
Claims (7)
1. An infield simulation middleware control system, characterized in that: the digital simulation system comprises a main control unit, a receiving unit, a digital simulation unit, a digital assembly, a transmitting unit and an output unit, wherein the main control unit, the digital simulation unit, the digital assembly, the transmitting unit and the output unit are sequentially connected, and the digital assembly is respectively connected with the receiving unit, the transmitting unit and the output unit;
the main control unit sets interference initial parameters and sends the parameters to the digital simulation unit through a serial port; the digital simulation unit sorts, analyzes and simulates the received signal parameters and then sends simulation data to the digital assembly; the receiving unit finishes the receiving and sensitivity control of signals, the detector generates video pulses, and the signals are down converted to frequency bands required by frequency measurement and frequency storage and transmitted to the digital component; the digital component stores, delays and copies the signal after the down-conversion according to the resolved information, performs Doppler modulation, generates a baseband signal under the current confrontation scene, and transmits the baseband signal to the transmitting unit; the transmitting unit up-converts the baseband signal processed by the digital assembly to the working frequency band of the signal received by the receiving unit and transmits the working frequency band to the output unit; the output unit amplifies and outputs the up-conversion signal output by the transmitting unit through the four-path three-level power amplifier, and harmonic suppression is realized through the digital attenuator and the medium-low pass filter to generate a final interference radio frequency signal.
2. An implementation method of an infield simulation middleware control system is characterized by comprising the following specific steps:
step 1, setting interference initial parameters, wherein the interference initial parameters comprise interference patterns, interference types and interference equipment initial parameters, and issuing the interference initial parameters to a digital simulation unit through a high-speed serial port;
step 2, after receiving the interference initial parameters, the digital simulation unit carries out initialization setting and caches the initial parameters in an internal memory of the digital simulation unit;
step 3, after the test is started, the main control unit resolves missile path data information of missile flight, real-timely issues distance, speed, position and RCS information between the missile and the interference equipment to the digital simulation unit, and the digital simulation unit analyzes, calculates and transmits the information to the digital assembly for signal modulation processing;
step 4, the interference equipment releases interference signals according to an interference scene, the receiving unit sorts and analyzes the receiving unit, modulation values of signal carrier frequency, amplitude and bandwidth parameters are determined, receiving and sensitivity control of input signals are completed, a detector generates video pulses, and the signals are down-converted to frequency bands required by frequency measurement and frequency storage;
step 5, the digital assembly receives the control signal transmitted by the digital simulation unit, stores, delays and copies the signal after down-conversion, and performs Doppler modulation to generate an interference signal in the current countermeasure scene;
step 6, after the digital component processes the interference signal on the baseband, the signal needs to be up-converted to the working frequency band of the signal received by the receiving unit, and the up-conversion process is actually the inverse process of down-conversion;
and 7, amplifying and outputting the up-conversion signal by the output unit through the four-way three-stage power amplifier, and realizing harmonic suppression through the digital attenuator and the medium-low pass filter to generate a final interference radio frequency signal.
3. The implementation method of the infield simulation middleware control system according to claim 2, characterized in that: in step 1, the interference pattern comprises deception interference and suppression interference; interference types include foil strip interference, radar decoy interference, active interference; the initial parameters of the interference equipment comprise the output power of the actual interference equipment, the antenna gain of the actual interference equipment, the transmitting power of a seeker, the antenna gain of the seeker, the distance between an output antenna of an internal field simulation middleware and a tested seeker, the feeder loss and the polarization loss, and the antenna gain of the internal field simulation middleware, wherein the interference equipment is an interference machine or a simulator.
4. The implementation method of the infield simulation middleware control system according to claim 2, characterized in that: and step 4, determining the pulse width of the signal and the modulation value of the repetition period.
5. The implementation method of the infield simulation middleware control system according to claim 2, characterized in that: step 4, specifically, the following steps are carried out:
step 4-1, after receiving an input signal, the front end of the receiving unit performs amplitude limiting and amplification filtering on the signal and then divides the signal into two paths;
step 4-2, after the power division of the signal, one path of signal is distributed to a reconnaissance part, the amplitude detection of the signal is completed, an amplitude detection pulse and a video synchronization pulse are generated, the sensitivity of the received signal is controlled after the amplitude detection is completed, the amplitude control of the received signal not only ensures that a middleware simulation control system can normally receive the signal during working, but also can prevent excessive signals under a complex electromagnetic environment from entering the resource of a receiver channel distributed control system through a sensitivity threshold control measure;
and 4-3, amplifying the other path of signals subjected to power division, then performing power division again into two paths, performing frequency conversion on one path of signals to provide frequency measurement signals, and outputting the other path of signals to a down-conversion unit to down-convert the signals to a frequency range required by radio frequency storage and frequency measurement.
6. The implementation method of the infield simulation middleware control system according to claim 2, characterized in that: the digital assembly receives a control signal transmitted by the digital simulation unit, stores, delays and copies a signal after down-conversion, performs Doppler modulation, and generates an interference signal under a current countermeasure scene, and the specific processing process is completed by the following steps:
step 5-1: when a seeker with a distance measurement function faces interference signals such as deception interference, foil strip interference, bait interference and the like in a battlefield environment, the signals of the seeker are related to the distance between the seeker and an interference device in a ballistic scene, so that during testing, echo delay of a transmitted signal needs to be modified on a digital component part, and the delay is calculated through a formula (1):
in the formula:
t is the delay time of the interference signal, s;
r is the distance between the seeker and the interfering device, m;
c-speed of light, 3X 108m/s；
Step 5-2: according to the position relation between the seeker and the interference equipment in the ballistic scene, the Doppler of the internal field simulation middleware needs to be modulated; the method for realizing Doppler frequency shift in the digital domain is implemented by using a high-speed and ultra-large-scale FPGA (field programmable gate array), and the method for realizing Doppler frequency shift in the digital domain is implemented by the following formula (2):
cos[2π(f0+fd)t]＝cos(2πf0t)cos(2πfdt)-sin(2πf0t)sin(2πfdt)…………(2)
in the formula:
f0-input signal carrier frequency, Hz;
fddoppler shift, Hz.
7. The implementation method of the infield simulation middleware control system according to claim 2, characterized in that: after the digital component processes the interference signal on the baseband, the signal needs to be up-converted to the working frequency band of the signal received by the receiving unit, the up-conversion process is actually the inverse process of down-conversion, and the up-conversion of the signal by the transmitting unit is specifically completed by the following steps:
and 6-1, receiving the frequency synthesis control signal generated by the digital assembly by the transmitting unit, selecting different frequency conversion local oscillators, and performing up-conversion on the baseband signal output in the step 5 to a radio frequency band.
And 6-2, receiving the video signal generated by the digital assembly by the transmitting unit, and carrying out video modulation on the up-conversion output signal.
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