CN112698278A - Chaotic broadband signal jammer and interference decision method - Google Patents
Chaotic broadband signal jammer and interference decision method Download PDFInfo
- Publication number
- CN112698278A CN112698278A CN202011016317.6A CN202011016317A CN112698278A CN 112698278 A CN112698278 A CN 112698278A CN 202011016317 A CN202011016317 A CN 202011016317A CN 112698278 A CN112698278 A CN 112698278A
- Authority
- CN
- China
- Prior art keywords
- chaotic
- circuit
- frequency
- signal
- broadband signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
- G01S7/38—Jamming means, e.g. producing false echoes
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
- H04K3/00—Jamming of communication; Counter-measures
- H04K3/40—Jamming having variable characteristics
- H04K3/42—Jamming having variable characteristics characterized by the control of the jamming frequency or wavelength
Abstract
The invention relates to the technical field of communication, in particular to a chaotic broadband signal jammer and an interference decision method, which comprise a high-frequency circuit, a single chip microcomputer control circuit, a relay circuit, a power amplification circuit and a power supply circuit, wherein the chaotic broadband signal generation circuit generates chaotic broadband signals through an RC chaotic oscillator consisting of a Venturi bridge R1C1-R2C2 and operational amplifiers OA1 and OA2, the chaotic broadband signals are transmitted to the high-frequency circuit for operation, the single chip microcomputer control circuit adjusts the high-frequency circuit according to a preset frequency domain range, and finally the power amplification circuit amplifies the chaotic broadband signals in a counteracting range to complete interference. The invention can scan in a plurality of frequency bands and synchronously emit interference signals, adds a relay controlled by a single chip microcomputer in a high-frequency circuit, and enlarges the range of selectable inductors, thereby increasing the oscillation frequency, enlarging the sweep frequency range and realizing the interference of full frequency bands.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a chaotic broadband signal jammer and an interference decision method.
Background
The broadband signal has good distance resolution, electromagnetic compatibility, anti-interference performance, higher penetration capability and low interception characteristic, so the broadband signal is widely applied to various fields such as radar, communication and the like since the last 60 th century. People obtain a series of valuable achievements in the aspects of broadband signal generation, analysis, processing and the like; however, with the advent of new theory and new technology, new results on broadband signal research are continually emerging. The chaotic signal is a pseudo-random signal generated by a deterministic system, has the characteristics of easy generation and control and the like, and has attracted great attention in the fields of broadband and ultra-broadband.
Disclosure of Invention
Aiming at the defects of the prior art, the invention discloses a chaotic broadband signal jammer and an interference decision method, which are used for solving the problem that the prior art cannot interfere chaotic broadband signals with distance resolution, electromagnetic compatibility, anti-interference performance, higher penetration capability, low interception characteristic and strong randomness.
The invention is realized by the following technical scheme:
the chaotic broadband signal generation circuit is characterized by generating chaotic broadband signals through an RC chaotic oscillator consisting of a Venturi bridge R1C1-R2C2, operational amplifiers OA1 and OA2, transmitting the chaotic broadband signals to the high-frequency circuit for operation, adjusting the high-frequency circuit according to a preset frequency domain range by the singlechip control circuit, and finally completing interference by amplifying the chaotic broadband signals in a counteracting range through the power of the power amplification circuit.
Further, the OA1 in the RC chaotic oscillator is a linear amplifier, the gain K1 is R3/R4+1, and the gain K2 of the OA2 is R7/R8+1, so that the RC chaotic oscillator is expressed as the following equation set:
where k, α and β are three control parameters, and H (u <0) ═ 0, H (u ≧ 0) ═ 1.
Furthermore, the control signal in the high-frequency circuit is input from a port P, the voltage-controlled oscillator is an LC frequency-selecting circuit consisting of a variable capacitance diode D, an inductor L and a capacitor C, the voltage at two ends of the variable capacitance diode is changed through the control signal, the variable capacitance diode is adjusted along with the change, and a high-frequency transmitting triode arranged in the high-frequency-selecting circuit amplifies a weak interference signal and transmits the amplified signal to the power amplification circuit.
Furthermore, the chaotic broadband signal generating circuit adopts a Colpitts circuit to generate chaotic broadband signals, and a driving F is added into the circuitinThe normalized equation can be found to be:
wherein g, Q, k are system parameters, VTFor adjusting the parameters by varying the drive FinThe chaotic broadband signal to be shielded can be obtained.
Furthermore, the single chip microcomputer control circuit selects the required inductance through controlling the switch of the relay circuit to be closed, when the single chip microcomputer control circuit inputs a low level, the relay circuit is controlled to be closed, when the single chip microcomputer control circuit inputs a high level, the relay circuit is controlled to be normally opened, the inductance is connected at the moment to increase the oscillation frequency, and the frequency sweeping range is enlarged.
In a second aspect, the present invention discloses an interference decision method for a chaotic wideband signal jammer, where the chaotic wideband signal jammer in the first aspect is used in the operation of the decision method, and the method includes the following steps:
s1, acquiring a chaotic broadband signal to be interfered, and calculating an autocorrelation function H (n, m) of a discrete instantaneous value, wherein n represents time, and m represents correlation;
s2, carrying out IFFT operation on the time n according to the autocorrelation function H (n, m) to obtain a fuzzy signal value and carrying out FFT operation to obtain a specific value;
s3, setting the frequency domain range of the chaotic broadband signal to be detected according to the specific value obtained by calculation in S2;
the S4 singlechip control circuit adjusts the high-frequency circuit through the frequency domain range set in S3, so that the generated chaotic broadband signal and the chaotic broadband signal to be interfered are in the same frequency band;
and S5, amplifying the power of the chaotic broadband signal through a power amplifying circuit, and offsetting the chaotic broadband signal in the range to finish interference.
Further, the autocorrelation function H (N, m) is a matrix of N × (N-1), where N is an even number, and H (N, m) is calculated to be 0 ≦ mmax(n) a value in the range of-mmaxThe value in the range of (n) more than or equal to m less than 0 is obtained by conjugate symmetry of the instantaneous autocorrelation function.
Further, the IFFT operation continuously changes the long sequence into the short sequence in odd-even order, resulting in the input sequence being in reverse order and the output sequence being in sequential order.
Furthermore, in S1, the frequency band detector acquires a chaotic wideband signal to be interfered, and the frequency band detector amplifies the acquired signal and transmits the amplified signal to the processor for processing and analysis, so as to obtain a digital signal that can be recognized by the single chip microcomputer.
Further, in S5, after the interference is completed, the interference effect is evaluated by calculating the form and parameters of the signal interference evaluation algorithm by sampling and then performing sample estimation.
The invention has the beneficial effects that:
the invention can scan in a plurality of frequency bands and synchronously emit interference signals, and adds a relay controlled by a single chip microcomputer in a high-frequency circuit, thereby enlarging the range of selectable inductors, increasing the oscillation frequency, enlarging the sweep frequency range and realizing the full-frequency-band interference.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be 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 invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a chaotic wideband signal jammer circuit;
FIG. 2 is a schematic step diagram of an interference decision method of a chaotic wideband signal jammer;
FIG. 3 is a diagram illustrating the result of the operation of the function H (n, m) according to an embodiment of the present invention;
fig. 4 is a frequency domain range diagram of an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. 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 invention.
Example 1
The embodiment discloses a chaotic broadband signal jammer as shown in fig. 1, which comprises a high-frequency circuit, a single chip microcomputer control circuit, a relay circuit, a power amplification circuit and a power supply circuit, wherein the chaotic broadband signal generation circuit generates chaotic broadband signals through an RC chaotic oscillator composed of a Venturi bridge R1C1-R2C2 and operational amplifiers OA1 and OA2, the chaotic broadband signals are transmitted to the high-frequency circuit for operation, the single chip microcomputer control circuit adjusts the high-frequency circuit according to a preset frequency domain range, and finally the power amplification circuit amplifies the chaotic broadband signals in a counteracting range to complete the jamming.
In the RC chaotic oscillator, OA1 is a linear amplifier, the gain K1 is R3/R4+1, and the gain K2 of OA2 is R7/R8+1, so that the RC chaotic oscillator is expressed by the following equation set:
where k, α and β are three control parameters, and H (u <0) ═ 0, H (u ≧ 0) ═ 1.
The voltage-controlled oscillator is an LC frequency-selecting circuit consisting of a variable capacitance diode D, an inductor L and a capacitor C, the voltages at two ends of the variable capacitance diode are changed through control signals, the variable capacitance diode is adjusted along with the change, and a high-frequency transmitting triode arranged in the high-frequency-selecting circuit amplifies weak interference signals and transmits the amplified signals to a power amplifying circuit.
The chaotic broadband signal generating circuit adopts a Colpitts circuit to generate chaotic broadband signals, and a driving F is added into the circuitinThe normalized equation can be found to be:
wherein g, Q, k are system parameters, VTFor adjusting the parameters by varying the drive FinThe chaotic broadband signal to be shielded can be obtained.
The single chip microcomputer control circuit selects the required inductance through controlling the switch of the relay circuit to be closed, when the single chip microcomputer control circuit inputs a low level, the relay circuit is controlled to be closed, when the single chip microcomputer control circuit inputs a high level, the relay circuit is controlled to be normally open, the inductance is connected to increase the oscillation frequency, and the frequency sweeping range is enlarged.
The interference unit of the embodiment can scan in a plurality of frequency bands and synchronously transmit interference signals, and a relay controlled by a single chip microcomputer is added in a high-frequency circuit, so that the range of selectable inductance is enlarged, the oscillation frequency is increased, the sweep frequency range is enlarged, and full-frequency-band interference is realized.
Example 2
The embodiment discloses an interference decision method of a chaotic broadband signal jammer, which is shown in fig. 2 and comprises the following steps:
s1, acquiring a chaotic broadband signal to be interfered, and calculating an autocorrelation function H (n, m) of a discrete instantaneous value, wherein n represents time, and m represents correlation;
s2 performs IFFT operation on time n according to autocorrelation function H (n, m) to obtain a value of the fuzzy signal and performs FFT operation to obtain a specific value, the specific result is shown in fig. 3;
s3, setting the frequency domain range of the chaotic broadband signal to be detected according to the specific value obtained by calculation in S2, wherein the specific result is shown in figure 4;
the S4 singlechip control circuit adjusts the high-frequency circuit through the frequency domain range set in S3, so that the generated chaotic broadband signal and the chaotic broadband signal to be interfered are in the same frequency band;
and S5, amplifying the power of the chaotic broadband signal through a power amplifying circuit, and offsetting the chaotic broadband signal in the range to finish interference.
The autocorrelation function H (N, m) is a matrix of N × (N-1), where N is an even number, and H (N, m) is calculated to be 0. ltoreq. m.ltoreq.mmax(n) a value in the range of-mmaxThe value in the range of (n) more than or equal to m less than 0 is obtained by conjugate symmetry of the instantaneous autocorrelation function.
The IFFT operation continuously changes the long sequence to the short sequence in odd-even order, resulting in the input sequence being in reverse order and the output sequence being in sequential order.
In S1, a frequency band detector is used for obtaining a chaotic broadband signal to be interfered, and the frequency band detector amplifies the collected signal and transmits the amplified signal to a processor for processing and analysis, so that a digital signal which can be identified by a single chip microcomputer is obtained.
In S5, after the interference is completed, sample estimation is performed by extracting a sample, and the interference effect is estimated by a function calculation form and parameters of a signal interference estimation algorithm.
Example 3
In this embodiment, the disturbed chaotic wideband signal is evaluated, and the sample estimation is performed after the sample is extracted, but a sample distribution form depending on a subordinate population is not used, because the function calculation form, the parameter content and the like of the returned mobile communication signal disturbance evaluation algorithm are not fixed, and the function value at each point is determined by its own data information.
Spatial unknowns in a given sample are set, namely (X1, Y1), (X2, Y2), (X3, Y3. (Xn, Yn), the unknowns are spatially distributed in an independent form and thus belong to two-dimensional random variables, and when a predicted value of mobile communication signal interference estimation is given, m (Xi, Yi) can be calculated according to a desired condition of X ═ Xi, Y ═ Yi. In the whole prediction process, the adjacent point of h in the designated range is found first, and the predicted value of the target point, namely the weighted value part of the adjacent point, is obtained according to the constructed weight of the function.
In the process of evaluating and measuring, the increased sample size or adjacent points in the field are analyzed, and the interference degree of the mobile communication signal is predicted by using the kernel regression measurement calculation, so that the problem of few sample points is solved.
Example 4
The embodiment discloses a method for acquiring a chaotic broadband signal to be interfered, which comprises the steps of firstly calculating an autocorrelation function H (n, m) of a discrete instantaneous value, wherein n represents time, and m represents correlation;
performing IFFT operation on time n according to autocorrelation function H (n, m) to obtain a fuzzy signal value, and performing FFT operation to obtain a specific value, where the specific result is shown in fig. 3;
and finally, setting the frequency domain range of the chaotic broadband signal to be detected according to the specific value obtained by calculation, and referring to a specific result shown in figure 4.
In wideband communication and wideband signal radar applications, it is generally required that the transmitted signal be a high frequency wideband signal having a rectangular bandpass spectrum. For communication and radar systems that require delay and correlation, among other operations, ease of signal delay or ease of reconstruction is an important advantage. In an electronic countermeasure environment, a complex form of the signal has more advantages. In addition, the stability of the system output signal with the parameter change caused by the environment is also an important index. The existing single analog chaotic source realization scheme and the digital chaotic source realization scheme are difficult to completely meet the requirements in application.
The method can generate broadband chaotic signals with higher frequency; the chaos characteristic of the output signal has robustness to the change of circuit parameters, the frequency spectrum range can be controlled, and the output signal has a band-pass spectrum similar to a rectangle; the output signal frequency spectrum is flatter than that of the output signal of the chaotic system realized by single simulation; the output chaotic signal is reproducible, i.e., almost identical output signals can be generated by the same system when the generation system information is completely known.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A chaotic broadband signal interference device comprises a high-frequency circuit, a single chip microcomputer control circuit, a relay circuit, a power amplification circuit and a power supply circuit and is characterized by comprising a chaotic broadband signal generating circuit, wherein the chaotic broadband signal generating circuit generates chaotic broadband signals through an RC chaotic oscillator which is composed of a Venturi bridge R1C1-R2C2 and operational amplifiers OA1 and OA2, the chaotic broadband signals are transmitted to the high-frequency circuit for operation, the single chip microcomputer control circuit adjusts the high-frequency circuit according to a preset frequency domain range, and finally the power amplification circuit amplifies and cancels the chaotic broadband signals in the range to complete interference.
2. The chaotic wideband signal jammer of claim 1, wherein OA1 in the RC chaotic oscillator is a linear amplifier, and the gain K1 ═ R3/R4+1, and the gain K2 of OA2 ═ R7/R8+1, then the RC chaotic oscillator is expressed as the following equation set:
where k, α and β are three control parameters, and H (u <0) ═ 0, H (u ≧ 0) ═ 1.
3. The chaotic broadband signal jammer of claim 1, wherein the control signal in the high frequency circuit is input from a port P, the voltage controlled oscillator is an LC frequency selection circuit consisting of a varactor diode D, an inductor L and a capacitor C, the voltage at two ends of the varactor diode is changed by the control signal, the varactor diode is adjusted along with the change, and a high frequency emitting triode is arranged to amplify and transmit a weak interference signal to the power amplification circuit.
4. The chaotic broadband signal jammer of claim 1, wherein the chaotic broadband signal generating circuit generates the chaotic broadband signal by using a Colpitts circuit, and a driving F is added to the circuitinThe normalized equation can be found to be:
wherein g, Q, k are system parameters, VTFor adjusting the parameters by varying the drive FinCan be applied to the chaotic broadband signal to be shielded.
5. The chaotic broadband signal jammer of claim 1, wherein the single chip microcomputer control circuit controls the on/off of the relay circuit to select a desired inductance, and when the single chip microcomputer control circuit inputs a low level, the relay circuit is controlled to be on, and when the single chip microcomputer control circuit inputs a high level, the relay circuit is controlled to be on, and at the moment, the inductance is connected to increase an oscillation frequency, so that a sweep frequency range is expanded.
6. A chaotic broadband signal jammer interference decision method, which uses the chaotic broadband signal jammer according to any one of claims 1 to 5 when operating, comprising the steps of:
s1, acquiring a chaotic broadband signal to be interfered, and calculating an autocorrelation function H (n, m) of a discrete instantaneous value, wherein n represents time, and m represents correlation;
s2, carrying out IFFT operation on the time n according to the autocorrelation function H (n, m) to obtain a fuzzy signal value and carrying out FFT operation to obtain a specific value;
s3 setting the frequency domain range of the chaotic broadband signal to be detected according to the specific value obtained by the calculation of S2;
the S4 singlechip control circuit adjusts the high-frequency circuit through the frequency domain range set in S3, so that the generated chaotic broadband signal and the chaotic broadband signal to be interfered are in the same frequency band;
and S5, amplifying the power of the chaotic broadband signal through a power amplifying circuit, and offsetting the chaotic broadband signal in the range to finish interference.
7. The chaotic broadband signal jammer interference decision method of claim 6, wherein the autocorrelation function H (N, m) is a matrix of N x (N-1), where N is an even number, and H (N, m) is calculated to be 0. ltoreq. m.ltoreq.mmax(n) a value in the range of-mmaxThe value in the range of (n) more than or equal to m less than 0 is obtained by conjugate symmetry of the instantaneous autocorrelation function.
8. The method of claim 6, wherein the IFFT operation continuously changes a long sequence into a short sequence according to parity, so that an input sequence is in a reverse order and an output sequence is in a sequential order.
9. The interference decision method of the chaotic broadband signal jammer of claim 6, wherein in S1, the chaotic broadband signal to be interfered is obtained through a frequency band detector, and the frequency band detector amplifies the acquired signal and transmits the amplified signal to a processor for processing and analysis, so as to obtain a digital signal recognizable by a single chip computer.
10. The method for deciding interference of a chaotic wideband signal jammer according to claim 6, wherein in S5, after the interference is completed, the sample estimation is performed by extracting the sample, and the interference effect is estimated by the function calculation form and the parameter of the signal interference estimation algorithm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011016317.6A CN112698278A (en) | 2020-09-24 | 2020-09-24 | Chaotic broadband signal jammer and interference decision method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011016317.6A CN112698278A (en) | 2020-09-24 | 2020-09-24 | Chaotic broadband signal jammer and interference decision method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112698278A true CN112698278A (en) | 2021-04-23 |
Family
ID=75505700
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011016317.6A Pending CN112698278A (en) | 2020-09-24 | 2020-09-24 | Chaotic broadband signal jammer and interference decision method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112698278A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101267221A (en) * | 2008-04-30 | 2008-09-17 | 浙江大学 | Communication interference system based on chaos signal source |
| CN201830201U (en) * | 2010-10-27 | 2011-05-11 | 江苏技术师范学院 | Broadband chaotic signal oscillator |
| CN104765031A (en) * | 2015-03-02 | 2015-07-08 | 太原理工大学 | Ultra-wide bandwidth microwave chaos life detection radar device |
-
2020
- 2020-09-24 CN CN202011016317.6A patent/CN112698278A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101267221A (en) * | 2008-04-30 | 2008-09-17 | 浙江大学 | Communication interference system based on chaos signal source |
| CN201830201U (en) * | 2010-10-27 | 2011-05-11 | 江苏技术师范学院 | Broadband chaotic signal oscillator |
| CN104765031A (en) * | 2015-03-02 | 2015-07-08 | 太原理工大学 | Ultra-wide bandwidth microwave chaos life detection radar device |
Non-Patent Citations (4)
| Title |
|---|
| 冯颜 等: "全频段考试作弊干扰器的设计", 《电子技术与软件工程》 * |
| 冯颜 等: "全频段考试作弊干扰器的设计", 《电子技术与软件工程》, no. 14, 31 July 2013 (2013-07-31), pages 1 - 4 * |
| 田琳 等: "Cohen类时频分布算法的改进及其在地震信号处理中的应用", 《科学技术与工程》 * |
| 田琳 等: "Cohen类时频分布算法的改进及其在地震信号处理中的应用", 《科学技术与工程》, vol. 13, no. 31, 30 November 2013 (2013-11-30), pages 1 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Martone et al. | Metacognition for radar coexistence | |
| Li et al. | Parameters identification of chaotic systems via chaotic ant swarm | |
| Haykin | Cognitive radar: a way of the future | |
| CN106896306B (en) | A kind of GIS oscillatory surge pressure test signal antinoise method | |
| Samantaray | Decision tree-initialised fuzzy rule-based approach for power quality events classification | |
| Koskela et al. | Recurrent SOM with local linear models in time series prediction. | |
| CN109359378A (en) | A kind of Weak Signal Detection Method of piecewise nonlinear bistable system | |
| CN111368892A (en) | Generalized S transformation and SVM electric energy quality disturbance efficient identification method | |
| Zhai et al. | A new sense-through-foliage target recognition method based on hybrid differential evolution and self-adaptive particle swarm optimization-based support vector machine | |
| Martone et al. | Practical aspects of cognitive radar | |
| He et al. | Analog circuit of a simplified Tent map and its application in sensor position optimization | |
| CN112698278A (en) | Chaotic broadband signal jammer and interference decision method | |
| Karasu et al. | The effects on classifier performance of 2D discrete wavelet transform analysis and whale optimization algorithm for recognition of power quality disturbances | |
| Ali et al. | A deep learning model implementation based on rssi fingerprinting for lora-based indoor localization | |
| Kannan et al. | High impedance fault classification using wavelet transform and artificial neural network | |
| Liu et al. | Human–human interaction recognition based on ultra-wideband radar | |
| EP3417311A1 (en) | A method for motion classification using a pulsed radar system | |
| Grimes et al. | Explanation of unintended radiated emission classification via lime | |
| Dash et al. | Time sequence data mining using time–frequency analysis and soft computing techniques | |
| Mehany et al. | Orthogonal discrete frequency-coding waveform design based on modified genetic algorithm for MIMO-SAR | |
| Wang et al. | KNN classification algorithm for multiple statuses detection of through-wall human being | |
| Xiaoyan et al. | An approach of radar clutter recognition based on higher-order statistics combination | |
| Renu et al. | An Insight into the Performance of Chaotic Sequences using Cascaded Mismatched Filters with Adaptive Performance of Radar Sequences using Adaptive Mismatched Filter | |
| Li et al. | A Spectrum Selection Method Based on Recurrent Neural Network for OTHR | |
| Mehany et al. | Design discrete frequency coding waveform based OFDM for MIMO-SAR |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210423 |