CN114184099A - Method and device for measuring fuze time delay - Google Patents
Method and device for measuring fuze time delay Download PDFInfo
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- CN114184099A CN114184099A CN202111297752.5A CN202111297752A CN114184099A CN 114184099 A CN114184099 A CN 114184099A CN 202111297752 A CN202111297752 A CN 202111297752A CN 114184099 A CN114184099 A CN 114184099A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42C—AMMUNITION FUZES; ARMING OR SAFETY MEANS THEREFOR
- F42C21/00—Checking fuzes; Testing fuzes
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Abstract
The application discloses a method for measuring fuze time delay, which comprises the steps of delaying a high-frequency modulated fuze signal by a device to be measured, and then carrying out frequency conversion to intermediate frequency to generate a measured signal; directly frequency-converting the high-frequency modulated fuse signal to an intermediate frequency to generate a reference signal; performing cross-correlation calculation on the measured signal and the reference signal to obtain an initial time delay value; respectively performing Hilbert transformation on the measured signal and the reference signal to obtain a phase difference value; and adjusting the frequency of the fuze signal, and performing Hilbert transform on the measured signal and the reference signal respectively across a plurality of periods so as to obtain a new phase difference value, and then calculating to obtain a delay value of the measured fuze signal. The application also includes a device implementing the method. The problem that prior art measurement accuracy is not high is solved in this application.
Description
Technical Field
The present application relates to the field of data processing, and in particular, to a data processing method and apparatus for measuring fuze time delay.
Background
The fuze is an important component of a missile weapon system and is required to have a high-precision time delay index. For conventional fuze signals, two methods are generally available for testing:
network analyzer method, suitable for continuous wave type fuzes. The fuse to be tested is regarded as a common two-port device, and a network analyzer is utilized to test the group delay. The method has no capability of complex signal modulation and fuses needing pulse synchronization. In addition, if the signal-to-noise ratio of the output signal of the tested fuse is poor, the measurement error is large.
Oscilloscope method, suitable for pulse modulated fuze signals. The modulation signal is determined by comparing the rising edge of the detected modulation signal with the input of the synchronization pulse to a two-channel oscilloscope. The measurement accuracy is limited by waveform distortion of the rising edge of the modulation wave and time delay of the detector, so that the method is not suitable for high-accuracy time delay measurement. In addition, the method is not suitable for complex signal modulation, such as fuse equipment with binary phase shift keying modulation and pseudo code modulation systems.
The time delay of the fuze is the same as that of the conventional radar, and is different from that of the conventional radar. The first difference is represented in the high precision of time delay, the technical index requirement of the fuse is incomparable with the conventional radar including a seeker; another particularity is that the signal system modulated by noise or pseudo-random signals also brings great changes to the time delay generation method, and is not measurable by the common data processing mode. The difficulty of the data processing method is that signal reconstruction is carried out on signals with complex signal modulation systems and poor output signal-to-noise ratios, the phase of the signals is accurately measured, and finally the time delay of the measured fuze is obtained.
Disclosure of Invention
The invention aims to provide a method and a device for accurately measuring the time delay of a fuse, aiming at solving the problem of low measurement precision in the prior art.
The embodiment of the application provides a device for measuring the time delay of a fuse, which is used for realizing the method of the application and comprises a modulator, a power divider, a tracking signal generator, a mixer, a data collector A, B and a data processor.
The fuze signal is output by the modulator and modulated, and is output by the power divider in two ways, wherein one way is a branch to be tested, and after the time delay of fuze equipment to be calibrated, the fuze signal and a signal generated by the tracking signal generator are mixed to an intermediate frequency by the mixer to generate a signal to be tested; one path of the uncorrected equipment is a reference branch, and the reference branch is directly mixed with a signal generated by the tracking signal generator to an intermediate frequency through another mixer to generate a reference signal. The measured signal and the reference signal are respectively input into a high-speed data collector, after being sampled by the data collector, the collected data are subjected to digital filtering, denoising, curve fitting, cross-correlation processing and Hilbert transform processing by a data processor, and the delay of the equipment to be calibrated is calculated.
The embodiment of the present application further provides a method for measuring a fuze time delay, including the following steps:
the high-frequency fuze signal is subjected to time delay and then frequency conversion to intermediate frequency by the tested fuze equipment, and a tested signal is generated; directly converting the fuze signal into an intermediate frequency to generate a reference signal;
performing cross-correlation processing on the measured signal and the reference signal to obtain an initial time delay value tau0；
The phase difference delta phi is obtained by using Hilbert transform to the measured signal and the reference signal1；
Adjusting the frequency of the fuze signal
Phase difference delta phi is obtained by using Hilbert transform to the measured signal and the reference signal across M periods2；
The time delay of the fuze device is
Preferably, before the step of solving the phase difference between the measured signal and the reference signal by using the hilbert transform, the method further comprises the following steps:
acquiring sampling data of the signal to be tested and the reference signal in one period through sampling;
and performing curve fitting on the sampled data to form a best fitting curve of the envelope of the measured signal, wherein the reference signal comprises the best fitting curve.
Preferably, the curve fitting adopts a polynomial fitting method.
Preferably, the step of solving the phase difference between the measured signal and the reference signal by using hilbert transform further includes:
setting reference branch reconstructed signal xh1(t), signal x after measured branch reconstructionh2(t); for xh1(t)、xh2(t) Hilbert conversion to yh1(t)，yh2(t); and then phase difference of the two paths of signals is obtained:
wherein z is1(t)＝xh1(t)×yh1(t)-xh2(t)×yh2(t)，z2(t)＝xh1(t)×yh2(t)+xh2(t)×yh1(t)。
Preferably, in an embodiment of any one of the methods of the present application, the method further comprises the steps of:
and after sampling the detected signal and the reference signal, carrying out narrow band-pass digital filtering and reserving intermediate frequency data.
Preferably, in an embodiment of any one of the methods of the present application, the method further comprises the steps of:
and after sampling the detected signal and the reference signal, carrying out normalization processing and removing direct-current components.
The embodiment of the present application further provides a device for measuring a time delay of a fuze, which is used for implementing the method in any embodiment of the present application, and the device includes a modulator, a power divider, a tracking signal generator, a mixer, a data acquisition unit, and a data processor.
The fuze signal is output by the modulator and modulated, and is output by the power divider in two ways, wherein one way is a branch to be tested, and after the time delay of fuze equipment to be calibrated, the fuze signal and a signal generated by the tracking signal generator are mixed to an intermediate frequency by the mixer to generate a signal to be tested; one path of the uncorrected equipment is a reference branch and is directly mixed with a signal generated by the tracking signal generator to an intermediate frequency through another mixer to generate a reference signal;
the measured signal and the reference signal are respectively input into a high-speed data collector, after being sampled by the data collector, the collected data are subjected to digital filtering, denoising, curve fitting, cross-correlation processing and Hilbert transform processing by a data processor, and the delay of the equipment to be calibrated is calculated.
Preferably, the data processor comprises a digital filtering module, a data normalization processing module, a cross-correlation processing module, a curve fitting module, a hilbert transform module, and a time delay output module.
The embodiment of the application adopts at least one technical scheme which can achieve the following beneficial effects:
compared with the fuse time delay measuring method in the prior art, the method can improve the time delay resolution of the fuse, is suitable for fuses of various signal systems, and can effectively reconstruct signals with poor output signal-to-noise ratio, so that the reconstructed waveform curve is smoother, and the measurement is more accurate.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
FIG. 1 is a diagram of an embodiment of the present invention for accurately measuring the time delay of a fuze;
fig. 2 is a flowchart of a data processing method for accurately measuring the fuze delay according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The method has the innovation points that for fuse equipment with a complex fuse modulation system and poor output signal-to-noise ratio, the digital filtering, correlation processing, curve fitting and Hilbert transform processing modes are adopted to reconstruct signals, the phase of the tested fuse is accurately measured, and finally the time delay of the tested fuse is obtained.
The technical solutions provided by the embodiments of the present application are described in detail below with reference to the accompanying drawings.
Fig. 1 shows an embodiment of the apparatus for accurately measuring the time delay of the fuze according to the present invention.
The input signal outputs a modulated fuze signal through the modulator 11, two paths of fuze signals are output through the power divider 12, a tested branch circuit is subjected to time delay through the fuze correcting device 13, and the tested branch circuit and a signal generated by the tracking signal generator 16 are mixed to a proper intermediate frequency through the mixer 14; the reference branch of the uncorrected device is mixed directly with the signal generated by the tracking signal generator to a suitable intermediate frequency by mixer 15. The two paths of intermediate frequency signals are respectively input to high-speed data acquisition devices 17 and 18, and after being sampled by the data acquisition devices, the acquired data are subjected to digital filtering, denoising, curve fitting, correlation and other processing by a data processor 19 to obtain the delay amount of the corrected fuze equipment.
In the device, an input signal before modulation is a continuous wave signal, and a modulator can generate a non-periodic signal with phase coding and pseudo-random code according to the characteristics of a fuse signal; the tracking signal generator is characterized by using a frequency offset phase-locked loop for generating a local oscillator for heterodyne reception, wherein the frequency is different from the frequency of the equipment to be corrected by an intermediate frequency, and the intermediate frequency signal is characterized by modulation information containing a fuze signal.
Fig. 2 is a flowchart of a data processing method for accurately measuring the fuze delay according to an embodiment of the present invention.
The data processing method for accurately measuring the fuse time delay comprises the following steps:
The intermediate frequency signals are measured signals and reference signals, and measured branch data and reference branch data are generated after the intermediate frequency signals are acquired and stored. The method comprises the steps of firstly, carrying out narrow-band low-pass digital filtering on two paths of data, filtering other frequency components through an IIR digital filter, and keeping intermediate frequency data.
And normalizing the filtered data of the measured branch and the reference branch, and removing the direct current component.
And after normalization processing, carrying out correlation processing on the two paths of signals. The method for comparing the waveforms of two signals and obtaining the time difference is to do cross-correlation operation to the two signals, which not only keeps the same frequency, but also keeps the phase information. The periodic signals with different frequencies are irrelevant, so that the reference signal with the same frequency and the detected signal can be subjected to cross-correlation processing, and the detected signal without interference can be obtained and the amplitude and phase information can be extracted because the interference signal and the reference signal have different frequencies. The correlation operation can obtain a peak value which is the initial time delay value tau of the tested fuze equipment0At this time, τ0The values are approximate. Since the noise signal is usually very small in correlation with the useful signal, the correlation process has a strong noise suppression capability.
When the signal is small or the signal-to-noise ratio is poor, the waveform of the signal acquired by the data is distorted, so that the value cannot be accurately measured, and therefore curve fitting needs to be performed on two paths of signals of the measured branch and the reference branch to realize signal reconstruction. This patent utilizes the least square method to carry out curve fitting to the data collection, resumes the signal.
Sample data xi(i is 1, 2, …, n is sampling point number) and a polynomial fitting is selected to obtain yi：
y＝b0+b1sin(ωx)+b2cos(wx)+b3x3 (1)
Formula (1) as description xiRegression equation of. Wherein xiTo sample data, b0、b1、b2、b3Is a polynomial coefficient, yiThe values obtained after fitting.
In order to determine this polynomial, the respective coefficient values b in the equation are requiredj(j is 0, 1, 2, 3), and the measured data set x is subjected toi(i-1, 2, …, n) has a best fit curve. B is xi、yiSubstituting the data into a polynomial to establish a system of equations
Wherein
According to the principle of least square method, each coefficient value b in the formula can be solved by solving the equationj(j ═ 0, 1, 2, 3), from which a regression curve of a 4 th order polynomial was obtained, which is the best fit curve for the set of experimental data, enabling reconstruction of the signal.
In step 25, an accurate time delay value in a single period is obtained by accurately measuring the phase difference of the two reconstructed signals. The reconstructed data of the two signals are subjected to Hilbert transform, the amplitude of the signals subjected to the Hilbert transform cannot be transformed according to the characteristic of the Hilbert transform, the phase is just delayed by 90 degrees, a time function related to the phase angle can be obtained after the detected signals and the signals subjected to the Hilbert transform are subjected to complex operation, and the phase difference of the two signals can be obtained through the operation.
Setting reference branch reconstructed signal xh1(t), signal x after measured branch reconstructionh2(t) for xh1(t)、xh2(t) Hilbert conversion to yh1(t)，yh2(t) of (d). Two groups of signals are multiplied by a complex number to obtain z1(t) and z2(t)。
z1(t)＝xh1(t)×yh1(t)-xh2(t)×yh2(t) (3)
z2(t)＝xh1(t)×yh2(t)+xh2(t)×yh1(t) (4)
To z1(t) and z2(t) calculating and deducing polar coordinates to obtain the phase difference of the two paths of signals
According to the measuring method of the fuse time delay, guarantee
Namely, it is
Wherein, Δ f is a fine adjustment value of the fuze signal to the frequency of the input signal; if the phase measurement is made across M periods,
wherein M is the number of the cross cycles, and the input signal frequency f + delta f of the fuze equipment is set, wherein
Obtaining the phase difference delta phi of the two paths of signals by utilizing the steps 24-252。
It should be noted that, here, "" (means)>"ideally should be" ═ i ", that is, Δ f is adjusted so that Δ f × τ is adjusted01 or M. In practice, it is difficult to achieve complete equality in the result of the adjustment, and therefore use is made of>It can be understood that the result of the adjustment is Δ f × τ0As close to 1 or M as possible, or, stated otherwise, the result of the adjustment Δ f × τ0The difference between 1 and M is less than the set threshold.
It should be noted that, here, the phase measurement is performed "across M periods" to obtain the phase difference Δ Φ of the two signals2It means that the phase comparison is performed by using the I-th period of the reference signal and the J-th period of the detection signal, wherein the difference between I and J is M.
It can be understood that Δ φ1The phase measurement is performed on the reference signal and the test signal in the same period, i.e., I-J.
Through the calculation, the method has the advantages that,
wherein tau is the time delay of the tested fuze equipment.
The present application also proposes a computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the method according to any of the embodiments of the present application.
The present application further proposes an electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the method according to any of the embodiments of the present application when executing the computer program.
Further, the electronic device, the processor, the memory, the storage medium, or the data processor 19 comprises at least one of a digital filtering module, a data normalization processing module, a cross-correlation processing module, a curve fitting module, a hilbert transform module, and a time delay output module;
the digital filtering module is used for realizing step 21 of the embodiment of the application, and comprises a program for executing the function of the step 21; the data normalization processing module is configured to implement step 22 in the embodiment of the present application, and includes a program for executing the function in step 22; the cross-correlation processing module is configured to implement step 23 in the embodiment of the present application, and includes a program for executing the function in step 23; the curve fitting module is used for realizing the applicationPlease refer to step 24, which includes the steps of executing the function of step 24; the hilbert transform module, configured to implement step 25 of the present application, includes a program for executing the functions of step 25, and when phase measurement is performed in the same period, the phase difference output by the hilbert transform module in step 25 is Δ Φ1(ii) a When the phase measurement is performed across M periods, the hubert transform module performs the phase difference output by step 25 as Δ φ2(ii) a The delay output module is configured to implement step 27 in the embodiment of the present application, and includes a program for executing the function in step 27.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In a typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (10)
1. A method of measuring a time delay of a fuze, comprising the steps of:
the high-frequency fuze signal is subjected to time delay and then frequency conversion to intermediate frequency by the tested fuze equipment, and a tested signal is generated; directly converting the fuze signal into an intermediate frequency to generate a reference signal;
performing cross-correlation processing on the measured signal and the reference signal to obtain an initial time delay value tau0；
The phase difference delta phi is obtained by using Hilbert transform to the measured signal and the reference signal1；
Adjusting the frequency of the fuze signal
Phase difference delta phi is obtained by using Hilbert transform to the measured signal and the reference signal across M periods2；
The time delay of the fuze device is
2. The method of measuring the time delay of a fuze according to claim 1, further comprising the step of,
acquiring sampling data of the signal to be tested and the reference signal in one period through sampling;
and performing curve fitting on the sampled data to form a best fitting curve of the envelope of the measured signal, wherein the reference signal comprises the best fitting curve.
3. The method of measuring fuse delay of claim 2,
and the curve fitting adopts a polynomial fitting method.
4. The method of claim 1, wherein the step of determining the phase difference between the measured signal and the reference signal using hilbert transform further comprises:
setting reference branch reconstructed signal xh1(t), signal x after measured branch reconstructionh2(t) for xh1(t)、xh2(t) Hilbert conversion to yh1(t)，yh2(t)；
Obtaining the phase difference of the two paths of signals:
wherein z is1(t)＝xh1(t)×yh1(t)-xh2(t)×yh2(t)，z2(t)＝xh1(t)×yh2(t)+xh2(t)×yh1(t)。
5. The method for measuring the time delay of the fuze according to any one of claims 1 to 4, further comprising the steps of:
and after sampling the detected signal and the reference signal, carrying out narrow band-pass digital filtering and reserving intermediate frequency data.
6. The method for measuring the time delay of the fuze according to any one of claims 1 to 4, further comprising the steps of:
and after sampling the detected signal and the reference signal, carrying out normalization processing and removing direct-current components.
7. A device for measuring the time delay of a fuse is used for realizing the method of any one of the embodiments of claims 1 to 6, and is characterized by comprising a modulator, a power divider, a tracking signal generator, a mixer, a data acquisition unit and a data processor;
the fuze signal is output by the modulator and modulated, and is output by the power divider in two ways, wherein one way is a branch to be tested, and after the time delay of fuze equipment to be calibrated, the fuze signal and a signal generated by the tracking signal generator are mixed to an intermediate frequency by the mixer to generate a signal to be tested; one path of the uncorrected equipment is a reference branch and is directly mixed with a signal generated by the tracking signal generator to an intermediate frequency through another mixer to generate a reference signal;
the measured signal and the reference signal are respectively input into a high-speed data collector, after being sampled by the data collector, the collected data are subjected to digital filtering, denoising, curve fitting, cross-correlation processing and Hilbert transform processing by a data processor, and the delay of the equipment to be calibrated is calculated.
8. The apparatus of claim 7,
the data processor comprises a digital filtering module, a data normalization processing module, a cross-correlation processing module, a curve fitting module, a Hilbert transform module and a time delay output module.
9. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the method according to any one of claims 1 to 6.
10. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the method according to any one of claims 1 to 6 when executing the computer program.
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| CN118066954A (en) * | 2024-04-25 | 2024-05-24 | 江西红声技术有限公司 | Electronic fuze testing method, system, readable storage medium and computer equipment |
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