CN111999710A - Frequency modulation radio fuse working state monitoring device and method - Google Patents

Frequency modulation radio fuse working state monitoring device and method Download PDF

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Publication number
CN111999710A
CN111999710A CN202010941664.3A CN202010941664A CN111999710A CN 111999710 A CN111999710 A CN 111999710A CN 202010941664 A CN202010941664 A CN 202010941664A CN 111999710 A CN111999710 A CN 111999710A
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signal
fuse
working
time
adopting
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王磊
陈柏言
孙志成
朱漫华
葛欣鑫
张军
解峥
马丽丽
陈征祥
邬松武
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Pla 63850 Unit
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
    • G01S7/40—Means for monitoring or calibrating
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
    • G01R23/16—Spectrum analysis; Fourier analysis
    • G01R23/165—Spectrum analysis; Fourier analysis using filters
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
    • G01S13/06—Systems determining position data of a target
    • G01S13/08—Systems for measuring distance only
    • G01S13/32—Systems for measuring distance only using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated
    • G01S13/34—Systems for measuring distance only using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated using transmission of continuous, frequency-modulated waves while heterodyning the received signal, or a signal derived therefrom, with a locally-generated signal related to the contemporaneously transmitted signal
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/88—Radar or analogous systems specially adapted for specific applications
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/88—Radar or analogous systems specially adapted for specific applications
    • G01S13/883—Radar or analogous systems specially adapted for specific applications for missile homing, autodirectors
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
    • G01S7/40—Means for monitoring or calibrating
    • G01S7/4004—Means for monitoring or calibrating of parts of a radar system

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  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Electromagnetism (AREA)
  • Mathematical Physics (AREA)
  • Radar Systems Or Details Thereof (AREA)

Abstract

The invention discloses a device and a method for monitoring the working state of a frequency modulation radio fuse, belonging to the field of radio fuses; firstly, a signal acquisition module acquires a working signal of a fuse; then the signal processing module processes the collected working signal; then the data acquisition module acquires the parameters of the fuze according to the processed working signal; and finally, the state acquisition module acquires the working state of the fuse by adopting a matched filtering technology and a time-frequency analysis method according to the parameters of the fuse. The technical scheme solves the problems that the working state of the fuse is difficult to monitor because the frequency modulation fuse signal is in the environments with low signal-to-noise ratio, non-stable and the like, and the matching filtering technology is adopted to detect the fuse signal in the environment with low signal-to-noise ratio; by adopting a time-frequency analysis method, the working state of the fuse can be obtained when the radio fuse works in a non-stable environment, and the working performance of the fuse is convenient to obtain.

Description

Frequency modulation radio fuse working state monitoring device and method
Technical Field
The invention relates to a radio fuse technology, in particular to a device and a method for monitoring the working state of a frequency modulation radio fuse.
Background
The fuze is a device for performing detonation control, ignition control and attitude control on ammunition on the premise of ensuring safety of the ammunition at ordinary times and in launching by utilizing environmental information, target information or according to preset conditions. To a certain extent, the performance of the fuze directly determines the destruction performance of the weapon system, so that the fuze needs to be monitored and the working state of the fuze needs to be interpreted in the performance evaluation of the weapon system, and whether the ammunition in the weapon can achieve the expected destruction effect is judged.
As the radar technology is developed, the radio fuze mainly works by using information such as target distance and speed carried by target echo, which is influenced by various factors such as explosion height, antenna parameters, target scattering characteristics and landing angle, so that the explosion height is greatly dispersed, and the ranging capability is limited. The frequency modulation radio fuse is a constant amplitude continuous wave radio fuse in which the frequency of a transmitting signal changes according to the rule of a modulation signal. The explosion height does not depend on the strength of the target to reflect the electromagnetic wave, but is positioned by the frequency of the echo wave, so the method has the advantages of high distance precision, less explosion height dispersion, high receiver sensitivity, low working voltage, simple structure, strong anti-interference capability and the like. Based on the advantages, the fuze with the system is widely applied to weapon systems.
The frequency modulation radio fuse adopts a linear frequency modulation system, under the condition of the same transmitting power, the amplitude and the signal-to-noise ratio of a frequency modulation signal are smaller than those of a non-modulation fuse signal, and the detection distance of a receiver with the same sensitivity is reduced more. Meanwhile, in the process of transmission and scattering of electromagnetic waves, interference factors such as fluctuation of a scattering cross section area of a target, non-uniform fading modulation of an electromagnetic wave transmission channel, multipath effect and the like enable actually received frequency modulation signals to have no possibility of constant amplitude, the characteristic of amplitude modulation of the frequency modulation signals is generally described by a multiplicative random noise process, the existence of multiplicative noise destroys the coherence of signal phases, the frequency spectrum of the signals is widened into a region, and the signal-to-noise ratio is reduced. Therefore, the frequency modulation fuse signal is in the environments of low signal-to-noise ratio, non-stability and the like, and the working state of the fuse is difficult to monitor.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a device and a method for monitoring the working state of a frequency modulation radio fuse, which aim to solve the problem that the working state of the fuse is difficult to monitor when a frequency modulation fuse signal is in environments with low signal-to-noise ratio, non-stability and the like.
The technical scheme adopted by the invention for solving the technical problems is as follows:
on the one hand, the method comprises the following steps of,
a frequency modulation radio fuse working condition monitoring device, comprising:
the signal acquisition module is used for acquiring a working signal of the fuse;
the signal processing module is used for processing the collected working signals;
the data acquisition module is used for acquiring the parameters of the fuze according to the processed working signal;
and the state acquisition module is used for obtaining the working state of the fuse by adopting a matched filtering technology and a time-frequency analysis method according to the parameters of the fuse.
Furthermore, the signal acquisition module adopts a high-gain antenna;
the high gain antenna includes: the device comprises a tripod for placing an antenna, a dial for indicating the adjustment degree of the antenna, a balancing weight, a parabolic antenna and a flange plate for connecting the balancing weight and the parabolic antenna; the tripod is connected with the dial and the flange disc through the connecting rod.
Further, the azimuth and the pitch angle of the antenna are adjusted before the working signal of the fuse is collected.
Furthermore, the signal processing module comprises a low noise amplifier, and the low noise amplifier is arranged in the mounting groove of the balancing weight and is used for enhancing the working signal collected by the high gain antenna;
the signal processing module further comprises a spectrum analyzer for converting the enhanced working signal into an intermediate frequency signal.
Further, the obtaining of the working state of the fuze by adopting the matched filtering technology according to the parameters of the fuze includes:
the state acquisition module adopts a matched filtering technology to accumulate the energy of the parameters of the fuze to acquire a detectable fuze signal;
detecting the detectable fuze signal using a threshold detection algorithm.
Further, the obtaining of the working state of the fuse by using a time-frequency analysis method according to the parameters of the fuse comprises:
the state acquisition module is used for acquiring the working state of the fuse in real time according to the parameters of the fuse by adopting a short-time Fourier time-frequency analysis method or a Wegener-power distribution time-frequency analysis method; alternatively, the first and second electrodes may be,
and the state acquisition module adopts a wavelet transform time-frequency analysis method to obtain the working state of the fuse by adopting a matched filtering technology and a time-frequency analysis method according to the parameters of the fuse.
Further, still include: and the GPS time system board is used for providing accurate timing for the device.
On the other hand, in the case of a liquid,
a frequency modulation radio fuse working state monitoring method comprises the following steps:
collecting a working signal of the fuse;
and analyzing the working state of the fuse by adopting a matching filtering technology and a joint time-frequency analysis method according to the working signal.
Further, enhancing the working signal by using a low noise amplifier;
adopting a spectrum analyzer to convert the enhanced working signal into an intermediate frequency signal;
and acquiring parameters of the intermediate frequency signal by adopting a high-speed data acquisition card.
Further, the step of analyzing the working state of the fuze according to the working signal by adopting a matching filtering technology and a joint time-frequency analysis method comprises the following steps:
performing energy accumulation on the parameters of the fuze by adopting a matched filtering technology to obtain a detectable fuze signal; detecting the detectable fuze signal using a threshold detection algorithm; and the number of the first and second groups,
and obtaining the working state of the fuze in real time according to the parameters of the intermediate frequency signals by adopting a short-time Fourier time-frequency analysis method or a Wegener-power distribution time-frequency analysis method, or obtaining the working state of the fuze according to the parameters of the intermediate frequency signals by adopting a wavelet transform time-frequency analysis method.
This application adopts above technical scheme, possesses following beneficial effect at least:
the technical scheme of the invention discloses a device and a method for monitoring the working state of a frequency modulation radio fuse, wherein a signal acquisition module acquires a working signal of the fuse; then the signal processing module processes the collected working signal; then the data acquisition module acquires the parameters of the fuze according to the processed working signal; and finally, the state acquisition module acquires the working state of the fuse by adopting a matched filtering technology and a time-frequency analysis method according to the parameters of the fuse. The technical scheme solves the problems that the working state of the fuse is difficult to monitor because the frequency modulation fuse signal is in the environments with low signal-to-noise ratio, non-stable and the like, and the matching filtering technology is adopted to detect the fuse signal in the environment with low signal-to-noise ratio; by adopting a time-frequency analysis method, the working state of the fuse can be obtained when the radio fuse works in a non-stable environment, and the working performance of the fuse is convenient to obtain.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a device for monitoring an operating state of a frequency-modulated radio fuse according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a device for monitoring the operating condition of a specific FM radio fuse according to an embodiment of the present invention
Fig. 3 is a schematic diagram of a high-gain antenna according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a threshold monitoring implementation process provided by an embodiment of the present invention;
fig. 5 is a flowchart of a method for monitoring an operating state of a frequency modulation radio fuse according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the following detailed description of the technical solutions of the present invention is provided with reference to the accompanying drawings and examples. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without making any creative effort, shall fall within the protection scope of the present application.
Firstly, the working principle of the radio fuze needs to be introduced, the frequency modulation radio fuze is a constant amplitude continuous wave radio fuze with the frequency of a transmitting signal changing according to the rule of a modulation signal, and has the advantages of no distance blind zone, easy realization of extremely high distance resolution, large signal energy, low working voltage, simple structure and the like. The difference between the two is related to the distance between the fuse and the target, and the frequency difference is measured, so that the distance between the fuse and the target can be obtained. The monitoring of the working state of the radio fuse mainly comprises monitoring whether the working time length and the working frequency of the radio fuse are matched with a preset range.
Referring to fig. 1, an embodiment of the present invention provides a device for monitoring an operating state of a frequency modulation radio fuse, including:
the signal acquisition module 110 is used for acquiring a working signal of the fuse;
a signal processing module 120, configured to process the acquired working signal;
the data acquisition module 130 is used for acquiring parameters of the fuze according to the processed working signal;
and the state acquisition module 140 is configured to obtain the working state of the fuse by using a matched filtering technique and a time-frequency analysis method according to the parameters of the fuse.
The embodiment of the invention provides a frequency modulation radio fuse working state monitoring device, which comprises a signal acquisition module, a frequency modulation radio fuse monitoring module and a signal processing module, wherein the signal acquisition module is used for acquiring working signals of a fuse; then the signal processing module processes the collected working signal; then the data acquisition module acquires the parameters of the fuze according to the processed working signal; and finally, the state acquisition module acquires the working state of the fuse by adopting a matched filtering technology and a time-frequency analysis method according to the parameters of the fuse. The technical scheme solves the problems that the working state of the fuse is difficult to monitor because the frequency modulation fuse signal is in the environments with low signal-to-noise ratio, non-stable and the like, and the matching filtering technology is adopted to detect the fuse signal in the environment with low signal-to-noise ratio; by adopting a time-frequency analysis method, the working state of the fuse can be obtained when the radio fuse works in a non-stable environment, and the working performance of the fuse is convenient to obtain.
As a supplementary explanation of the above embodiment, the present invention further provides a specific device for monitoring the working state of the frequency modulation radio fuse, as shown in fig. 2, the signal acquisition module employs a high-gain antenna 210;
as shown in fig. 3, the high gain antenna includes: a tripod 301 for placing an antenna, a dial 302 for indicating the degree of adjustment of the antenna, a counterweight 303, a parabolic antenna 304 and a flange 305 for connecting the counterweight and the parabolic antenna; the tripod is connected to the dial and the flange by a connecting rod 306.
The signal processing module comprises a low noise amplifier 220, wherein the low noise amplifier is arranged in the mounting groove of the balancing weight and is used for enhancing the working signal collected by the high gain antenna;
the signal processing module further comprises a spectrum analyzer 230 for frequency converting the enhanced operating signal to an intermediate frequency signal. Under LabVIEW development environment, the instrument with GPIB interface has three programming methods of GPIB module drive, VISA module drive and specified instrument drive program, and can directly perform the required VI programming. The method selects a GPIB module in LabVIEW to program and control the spectrum analyzer, and comprises the steps of setting parameters such as a central frequency point, an analysis bandwidth and a reference level when the spectrum analyzer works.
The data acquisition module adopts a high-speed data acquisition card 240 and is used for acquiring the parameters of the fuze according to the intermediate frequency signals obtained by the spectrum analyzer.
As an alternative embodiment of the present invention, a GPS time system board 260 is also included to provide accurate timing for the device. The GPS and B code time system card adopted by the embodiment of the invention is not an NI product and has no corresponding driving program under a LabVIEW environment, so that API (application program interface) software carried by the card is called to reproduce a DLL (dynamic link library), and the communication with the GPS and B code time system card is realized through a DLL file.
The GPIB card 270 is used for controlling the spectrum analyzer, a GPIB (visa) module in LabVIEW is selected for programming control of the spectrum analyzer, parameters such as a central frequency point, analysis bandwidth and a reference level when the spectrum analyzer works are set, the spectrum analyzer is controlled to achieve a function of locking a monitoring signal broadband search narrow band, and the receiving distance of equipment can be effectively increased. The signal to noise ratio of the signal is improved by using matched filtering, reliable detection of the fuse signal is realized by a threshold value, the fuse connection time or the working time of a transmitter is measured when the weapon system is combined with the transmitting zero, and the fuse signal can be detected in the environment with low signal to noise ratio. And a joint time-frequency analysis processing algorithm is adopted, so that the time-varying rule of the frequency-adjusting fuze signal is well measured under the non-steady condition.
In some alternative embodiments, the status obtaining module 250 is a processing chip with a fixed program stored therein or processing software on a computer. In the actual use process, firstly, the state acquisition module adopts the matched filtering technology to carry out energy accumulation on the parameters of the fuse to acquire a detectable fuse signal; a threshold detection algorithm is then used to detect the detectable fuze signal. And then, processing the fuse signal by adopting any one of the following three time domain analysis methods according to actual conditions, wherein firstly, the real-time processing is carried out, namely, the processing mode of the short-time Fourier time-frequency analysis method for obtaining the working state of the fuse in real time according to the parameters of the fuse by adopting a short-time Fourier time-frequency analysis method or a Wegener-power distribution time-frequency analysis method is good in timeliness and can give out the working state in time, but the accuracy is not accurate, the Wegener-power distribution time-frequency analysis method has high requirements on the fuse signal, when the fuse signal is a single signal, a more accurate result can be obtained, but once the fuse signal is not single, the result cannot be obtained. Both time domain analyses can be used during weapon flight tests. The other time domain analysis method is post-processing, namely adopting a wavelet transformation time-frequency analysis method to obtain the working state of the fuse by adopting a matched filtering technology and a time-frequency analysis method according to the parameters of the fuse. The processing mode cannot give the working state in real time and has certain delay, but the given working state is more accurate. The treatment method is generally used after the weapon flight experiment is finished.
The middle of the balancing weight is provided with a mounting groove which is provided with an AC-DC power supply and a low noise amplifier. The polarization direction of the parabolic antenna is consistent with the direction of a silvery white arrow label on the front face of the antenna, and the polarization direction of the high-gain antenna can be changed by rotating the parabolic antenna and changing the screw positions of the connecting rod and the waist-shaped hole of the flange plate when the antenna is used. The signals are received by the antenna and need to be amplified with low noise, then enter a spectrum analyzer, and are converted into intermediate frequency signals by utilizing a CRP programmable intermediate frequency output module, and the data are recorded by a data acquisition card.
In some embodiments, in order to increase the working distance of the existing apparatus, the present invention provides a function of controlling a spectrum analyzer by using a GPIB card to implement narrowband lock for wideband search of a monitoring signal, and the main implementation process of the function is as follows: firstly, a larger search bandwidth is set to realize the acquisition of the signal, an MT1 (set cursor automatic tracking function) instruction code is sent to the spectrum analyzer immediately after the signal is found, and then a bandwidth data instruction of narrow-band locking is sent, so that the receiving distance of the equipment can be effectively increased through the functions.
It should be noted that, in order to ensure that the embodiment of the present invention can complete the monitoring task, when monitoring data acquisition and analysis are performed on the frequency modulation radio fuse, a high-gain antenna is firstly erected to a corresponding test site, and the azimuth and the pitch angle of the antenna are calculated according to the station arrangement azimuth before the test. The detection distance of the radio fuze signal monitoring has a great relationship with the sensitivity of the receiver, but is related with the performance (radiation power, antenna directivity) of the fuze and the configuration of the monitoring system, so that the azimuth and the pitch angle of the antenna are adjusted before the working signal of the fuze is collected.
Specifically, let the power of the fuze radiation be PfGain of fuze antenna is GfThe directional function is Ff(xi), the operating wavelength is lambda, and the gain of the receiving antenna is GJrThe directional function is FJr(phi), the receiving distance is RJr. The minimum signal power received by the radio fuze signal monitoring receiver is as follows:
Figure BDA0002673854940000101
in the formula: gamma-polarization coefficient
Psi-transmission coefficient
n-reliability coefficient.
As a preferred implementation manner of the embodiment of the present invention, in the process of testing and identifying the radio fuse, the power connection time or the operating time of the transmitter of the fuse and the dynamic frequency of the radio fuse need to be monitored. The purpose of the radio fuze time parameter measurement is to obtain the fuze battery activation time or the fuze transmitter operating time in ballistic flight. The method is that a timing starting signal is generated when the projectile is launched, and a fuse signal is searched and received by using a signal detection means. The time interval from the generation of the timing start signal to the reception of the fuse signal is the power-on time of the fuse transmitter. The time interval from the reception of the fuze signal to the interruption of the fuze signal is the operating time of the fuze transmitter. The measurement of the dynamic frequency of the radio fuse is carried out by receiving and analyzing the high-frequency signal when the fuse works, and is used for judging whether the working state of the high-frequency part of the fuse is normal or not. In order to realize the monitoring of the frequency-modulated radio fuze signal, the error-free detection of the fuze signal and the estimation of the fuze signal modulation parameters need to be completed.
According to the characteristics of the frequency modulation radio fuse signal and the fuse monitoring index requirement, the realization process of the fuse monitoring method is determined as follows: energy accumulation is carried out by adopting a matched filtering technology, and the existence of a fuse signal is judged by threshold detection of the signal, so that the radio fuse connection time or the working time of a transmitter is monitored. According to the characteristic that the amplitude-frequency characteristic of the frequency-modulated fuse signal is close to a rectangle, the signal-to-noise ratio of the signal is improved by using the matched filtering technology, and the purpose of reliably detecting the fuse signal at a long distance is achieved. The matched filter is a pulse compression system, and the pulse width is reduced by compressing the pulse signal, so that the peak power of the pulse is improved, and the detection of the signal is facilitated. The transmission signal should have a nonlinear phase spectrum and make its envelope close to a rectangle, and the frequency characteristics (including amplitude frequency characteristics and phase frequency characteristics) of the compression network are required to be completely matched with the frequency spectrum (including amplitude spectrum and phase spectrum) of the transmission pulse signal.
In order to realize the optimal detection of the fuse signal, the envelope value of the received fuse signal can be maximized by using the matched filter, so that the threshold detection of the fuse signal is realized. The implementation process is shown in fig. 4, and in fig. 4, u (t): inputting a signal;
y (t): and outputting the signal.
When the observation waveform passes through the matched filter, the envelope value of the output signal y (T) is maximum at the moment T, so that the threshold detection of the frequency modulation fuse signal is realized.
Let the received signal be:
x(n)＝u(n)+w(n)
u(n)＝Acos{2π(f0t+μt2/2)+θ}
wherein w (n): white gaussian noise;
u (n): frequency modulation signals;
initial frequency f0：5；
Adjusting the frequency mu: 2;
amplitude A: 1;
random initial phase θ:
Figure BDA0002673854940000121
under the condition that the false alarm rates are 0.01, 0.001, 0.0001, 0.00001 and 0.000001, respectively, through the threshold detection algorithm, the detection probability of the fuze signal under different signal-to-noise ratios is calculated through the matched filtering algorithm, and the detection of the fuze signal can be completed under the condition that the signal-to-noise ratio of the input signal is small through the matched filtering. The maximum detectable signal-to-noise ratio decreases further as the maximum allowable false alarm rate increases. Therefore, the signal-to-noise ratio of the frequency modulation fuse signal can be effectively improved by utilizing the matched filtering technology, and the detection requirement of the fuse signal in a long distance can be completely met. By detecting the fuse signal and combining with the zero emission time, the monitoring of the fuse power-on time or the working time of the transmitter can be obtained.
Because the frequency modulation fuse signal has large bandwidth and low power, the interception probability of the frequency modulation fuse signal is reduced, and the reliable detection of the signal is difficult to complete by using methods such as frequency spectrum analysis and the like. Aiming at the monitoring of the dynamic frequency of the radio fuse, the invention provides a joint time-frequency analysis method for processing and completing a monitoring task and provides support for the working state evaluation of the fuse.
The mainstream methods of Time-frequency analysis include a Short Time Fourier Transform (STFT), a Wavelet Transform (WT), and a Wigner-power Distribution (WVD).
The STFT time-frequency analysis method is suitable for analyzing piecewise stationary signals or approximately stationary signals, but for non-stationary signals, when the signal changes violently, a window function is required to have higher time resolution; when the waveform changes more slowly, mainly low frequency signals, the window function is required to have higher frequency resolution. Because the STFT window function is limited by the uncertain criterion, the time and frequency resolution of the STFT window function cannot be simultaneously optimized, so the window function needs to be reasonably selected according to the characteristics and requirements of signals.
The WT time-frequency analysis method is a weighted sum which expands signals into a family of basis functions, namely, a family of functions is used for representing or approximating the signals or the functions, is the most common time-frequency analysis method which has multi-resolution analysis and can represent the local characteristics of the signals in two time-frequency domains, inherits the idea of local transformation of STFT, overcomes the defect that a window function cannot be changed along with frequency, can achieve continuous multi-scale refinement of the signals, and can perform time-frequency analysis on the signals in a self-adaptive manner.
The WVD time-frequency analysis method can fully reflect the energy distribution structure and relative strength of signals, but the expression shows that the WVD time-frequency analysis method has cross terms, and when the signal components are increased, the cross terms can cause the phenomena of frequency aliasing and interference of analysis results to influence the accuracy of signal analysis.
The embodiment of the invention carries out monitoring analysis on the frequency modulation radio fuse, carries out post analysis and processing on the acquired signal, and finds that the method can be applied to extraction of demodulation parameters of the frequency modulation fuse, but the application conditions are different. The WT analysis precision is high, but the algorithm real-time performance is poor, and the method is suitable for post-event high-precision analysis; the precision of the STFT analysis method can basically meet the requirement, the algorithm has good real-time performance, and is suitable for real-time processing and transmitting the analysis result to a test command center, and if the precision is improved, the precision is mainly limited by the optimal selection of a window function; the WVD analysis method can realize dynamic frequency demodulation under the conditions that the accuracy requirement for obtaining demodulation parameters is not high and signal components are single, and can observe the relative strength of energy distribution, but easily causes frequency aliasing interference when the signal components are complex and the accuracy requirement is high, thereby influencing the judgment of a fuze state. The state parameters of the fuse in working can be obtained by a joint time-frequency analysis method, so that whether the working state of the fuse is normal or not is obtained.
In one embodiment, the present invention further provides a method for monitoring the operating state of a frequency modulation radio fuse, including the following steps:
collecting a working signal of a fuse;
and analyzing by adopting a matching filtering technology and a joint time-frequency analysis method according to the working signal to obtain the working state of the fuse.
In the actual monitoring process, a low noise amplifier is adopted to enhance the working signal;
adopting a spectrum analyzer to convert the enhanced working signal into an intermediate frequency signal;
and acquiring parameters of the intermediate frequency signals by adopting a high-speed data acquisition card.
As an optional implementation manner in the embodiment of the present invention, the obtaining of the working state of the fuze by analyzing the working signal by using the matched filtering technology and the joint time-frequency analysis method includes:
firstly, energy accumulation is carried out on the parameters of the fuse by adopting a matched filtering technology to obtain a detectable fuse signal; detecting the detectable fuze signal using a threshold detection algorithm;
then, the working state of the fuse is obtained in real time according to the parameters of the intermediate frequency signals by adopting a short-time Fourier time-frequency analysis method or a Wegener-power distribution time-frequency analysis method, or,
and obtaining the working state of the fuse according to the parameters of the intermediate frequency signal by adopting a wavelet transform time-frequency analysis method.
According to the frequency modulation radio fuse working state monitoring method provided by the embodiment of the invention, the dynamic frequency parameters of the fuse can be better acquired through a combined time-frequency analysis method; the STFT time-frequency analysis method can rapidly demodulate the dynamic frequency of the fuse in real time, but window function parameters need to be set artificially according to the complexity of the components of the fuse signal, and the STFT time-frequency analysis method is mainly suitable for the condition that the parameters need to be demodulated and displayed in real time; the WVD time-frequency analysis method can realize dynamic frequency demodulation when the signal components are single, and can observe the relative strength of energy distribution, but because of the inherent problem of cross terms, frequency aliasing interference is easy to occur, thereby influencing the judgment of the fuse state; the WT time-frequency analysis method can realize parameter demodulation in a self-adaptive manner according to a fuse signal, but has poor real-time performance and is suitable for the situation of high-precision analysis of post-processing data. In the actual application process, different time-frequency analysis methods are needed to be selected according to actual conditions to demodulate the frequency modulation radio fuse parameters. Through the analysis, the method can monitor the state and other performance indexes of the frequency modulation radio fuse in the working process, and provides a basis for performance evaluation of the frequency modulation radio fuse.
It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments.
It should be noted that, in the description of the present application, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Further, in the description of the present application, the meaning of "a plurality" means at least two unless otherwise specified.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and the scope of the preferred embodiments of the present application includes other implementations in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present application.
It should be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present application may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.

Claims (10)

1. A frequency modulated radio fuse operating condition monitoring device, comprising:
the signal acquisition module is used for acquiring a working signal of the fuse;
the signal processing module is used for processing the collected working signals;
the data acquisition module is used for acquiring the parameters of the fuze according to the processed working signal;
and the state acquisition module is used for obtaining the working state of the fuse by adopting a matched filtering technology and a time-frequency analysis method according to the parameters of the fuse.
2. The apparatus of claim 1, wherein: the signal acquisition module adopts a high-gain antenna;
the high gain antenna includes: the device comprises a tripod for placing an antenna, a dial for indicating the adjustment degree of the antenna, a balancing weight, a parabolic antenna and a flange plate for connecting the balancing weight and the parabolic antenna; the tripod is connected with the dial and the flange disc through the connecting rod.
3. The apparatus of any of claims 1-2, wherein: and adjusting the azimuth and the pitch angle of the antenna before acquiring the working signal of the fuse.
4. The apparatus of claim 2, wherein: the signal processing module comprises a low-noise amplifier, and the low-noise amplifier is arranged in the mounting groove of the balancing weight and is used for enhancing the working signal collected by the high-gain antenna;
the signal processing module further comprises a spectrum analyzer for converting the enhanced working signal into an intermediate frequency signal.
5. The apparatus of claim 1, wherein: the obtaining of the working state of the fuse by adopting the matched filtering technology according to the parameters of the fuse comprises the following steps:
the state acquisition module adopts a matched filtering technology to accumulate the energy of the parameters of the fuze to acquire a detectable fuze signal;
detecting the detectable fuze signal using a threshold detection algorithm.
6. The apparatus of claim 1, wherein: the obtaining of the working state of the fuse by adopting a time-frequency analysis method according to the parameters of the fuse comprises the following steps:
the state acquisition module is used for acquiring the working state of the fuse in real time according to the parameters of the fuse by adopting a short-time Fourier time-frequency analysis method or a Wegener-power distribution time-frequency analysis method; alternatively, the first and second electrodes may be,
and the state acquisition module adopts a wavelet transform time-frequency analysis method to obtain the working state of the fuse by adopting a matched filtering technology and a time-frequency analysis method according to the parameters of the fuse.
7. The apparatus of claim 1, further comprising: and the GPS time system board is used for providing accurate timing for the device.
8. A frequency modulation radio fuse working state monitoring method is characterized by comprising the following steps:
collecting a working signal of the fuse;
and analyzing the working state of the fuse by adopting a matching filtering technology and a joint time-frequency analysis method according to the working signal.
9. The method of claim 8, further comprising:
enhancing the working signal with a low noise amplifier;
adopting a spectrum analyzer to convert the enhanced working signal into an intermediate frequency signal;
and acquiring parameters of the intermediate frequency signal by adopting a high-speed data acquisition card.
10. The method of claim 9, wherein: the step of analyzing the working state of the fuse by adopting a matching filtering technology and a joint time-frequency analysis method according to the working signal comprises the following steps:
performing energy accumulation on the parameters of the fuze by adopting a matched filtering technology to obtain a detectable fuze signal; detecting the detectable fuze signal using a threshold detection algorithm; and the number of the first and second groups,
and obtaining the working state of the fuze in real time according to the parameters of the intermediate frequency signals by adopting a short-time Fourier time-frequency analysis method or a Wegener-power distribution time-frequency analysis method, or obtaining the working state of the fuze according to the parameters of the intermediate frequency signals by adopting a wavelet transform time-frequency analysis method.
CN202010941664.3A 2020-09-09 2020-09-09 Frequency modulation radio fuse working state monitoring device and method Pending CN111999710A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113655275A (en) * 2021-08-27 2021-11-16 中国科学院云南天文台 Space radio environment measurement and control device and system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113655275A (en) * 2021-08-27 2021-11-16 中国科学院云南天文台 Space radio environment measurement and control device and system

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