CN113691474A - Electromagnetic pulse power synthesis technology based on time reversal - Google Patents
Electromagnetic pulse power synthesis technology based on time reversal Download PDFInfo
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Abstract
The invention discloses an electromagnetic pulse power synthesis technology based on time reversal, belonging to the field of electromagnetic field and microwave communication; the system comprises a channel detection signal generator for generating a channel detection signal; the time reversal mirror is used for carrying out time reversal operation on the received channel detection signal; the strong electromagnetic pulse space power receiver is used for receiving the strong electromagnetic pulse synthesized by the technology. The invention solves the problems of broadband, strong electromagnetic pulse, indoor complex environment and the like which cannot be solved by the existing spatial power synthesis technology, and realizes the spatial power synthesis effect of the broadband strong electromagnetic pulse.
Description
Technical Field
The invention belongs to the field of electromagnetic field and microwave communication, and particularly relates to an electromagnetic pulse power synthesis technology based on time reversal.
Background
Recently, strong electromagnetic pulse space power synthesis technology is becoming the current popular research direction. The microwave space power synthesis has the characteristics of high power capacity, low standing wave and broadband, can obtain broadband microwave beams with high power, high repetition frequency and high energy, and is an important way for realizing a high-power microwave system with strategic value. Detailed investigation and simulation are performed on the power synthesis technology in a complex indoor environment by using a time reversal method.
Time Reversal (TR) techniques have the property of space-Time focusing. The method is firstly applied to the acoustic field, and is introduced into the microwave field in recent years as a technology of underwater communication. Due to the space-time focusing characteristic, the time reversal technology can be conveniently applied to an ultra-wideband (UWB) system. TR is a signal processing technique that was first proposed by M.Fink et al[1,2]. Was used for underwater acoustic communication in 1992. In 1998, experiments have shown that the time-reversal mirror (TRM) method can treat reflections in the seaAnd refraction. In addition, the TRM can reduce signal interference caused by multipath effects, and sound propagation path attenuation caused by non-uniform flow fields. Later, in 2004, g.lerosey et al, introduced TR into the field of electromagnetism, and they successfully designed an electromagnetic wave time reversal system to accomplish the time-space synchronization of electromagnetic waves. In 2009, Liao et al studied the theory of electromagnetic wave reverse time focusing, simulated the TR process by using a finite difference time domain method, discussed the propagation conditions of time-reversal electromagnetic waves in homogeneous and heterogeneous media, and verified the ability of electromagnetic wave space-time focusing by numerical simulation. The received signal is time-reversed and retransmitted by the corresponding antenna along its original path, and the resulting wave converges back to its original source. The simulation measurements show that the focus peak is increased by a factor of 2-13 compared to the TR-free process. A team of KJ Liu, university of Maryland, USA, introduced wireless communication using TR's unique space-time focusing features, and proposed a time division multiple access (TRDMA) system. The uniqueness and independence of the location are distinguished, and the signature of the user specific location is used as multiple access to achieve spatial multiplexing, thereby increasing the system user capacity, which will become an effective indoor communication solution in the future. In an actual scene, it is difficult to satisfy the statistical independence of echo signals due to the difference of scatterers. Wu sullu proposes a practical algorithm to solve the multi-target detection problem in 2015: the position of the target is imaged based on a time reversal technique. With the continuous improvement and development of the TR technology, the TR technology has been widely applied to many fields such as medical imaging, ultra-wideband communication, radar detection, underwater acoustic communication, physical layer security and the like[3-7]. Recently, applications to electromagnetism such as wireless communication, generation of high field strength pulses, non-destructive testing (NDT), localization of breast cancer, and detection of buried objects have been made.
Disclosure of Invention
The invention aims to: the invention provides an electromagnetic pulse power synthesis technology based on time reversal, solves the problems of broadband, strong electromagnetic pulse, indoor complex environment and the like which cannot be solved by the existing space power synthesis technology, and realizes the broadband strong electromagnetic pulse space power synthesis effect.
The technical scheme adopted by the invention is as follows:
an electromagnetic pulse power synthesis technology based on time reversal is characterized in that: the method comprises the following steps:
step 1: the channel detection signal generator transmits a channel detection signal S (t);
step 2: a time reversal mirror receives a channel detection signal S (t) and a receiving signal H (t) formed after the channel detection signal S (t) is scattered by a complex indoor environment;
and step 3: inverting and amplifying the received signal H (t) to obtain a signal C (t) which is sent to an antenna array;
and 4, step 4: after the antenna array sends a signal C (t), the signal C (t) is converted into a focusing signal L (t) through an original channel to carry out indoor complex environment broadband strong electromagnetic pulse space power synthesis.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. the time reversal technology adopted by the invention has the advantages of self-adaption to complex and multi-environment;
2. compared with the traditional technology of realizing the synthesis of the space power of the strong electromagnetic pulse by the phased array, the time reversal array is reasonably arranged, and the invention can solve the problems that the traditional scheme can not realize the broadband, can not carry out the synthesis of the space power in the complex indoor environment and the like.
Drawings
The invention will now be described, by way of example, with reference to the accompanying drawings, in which:
FIG. 1 is a schematic diagram of the system architecture of the present invention;
FIG. 2 is a diagram of the electric field strength distribution of the system of the present invention;
FIG. 3 is a flow chart of a method of the present invention;
FIG. 4 is a schematic diagram of a channel sounding signal of the present invention;
FIG. 5 is a schematic diagram of signals received by an antenna array according to the present invention
FIG. 6 is a schematic diagram of an inverted amplified signal according to the present invention;
Detailed Description
All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.
The present invention is described in detail below with reference to fig. 1-6.
Example 1
The channel-sounding signal generator includes one or more signal-transmitting antennas, and the time-reversal mirror includes a plurality of antennas.
An electromagnetic pulse power synthesis technique based on time reversal comprises
A channel sounding signal generator for generating a channel sounding signal;
the time reversal mirror is used for carrying out time reversal operation on the received channel detection signal;
the strong electromagnetic pulse space power receiver is used for receiving the strong electromagnetic pulse synthesized by the technology.
The indoor environment is provided with metal walls on the periphery;
the responsible environment is set into a plurality of metal bodies which are equivalent to a table and a chair;
interference and diffraction: when the electromagnetic waves meet an obstacle, the electromagnetic waves deviate from the original propagation direction and continue to propagate, and when the coherent waves meet at a certain position in space, interference action is generated among the coherent waves due to different phases, the electromagnetic waves are overlapped in the space to form a secondary radiation source, so that a receiving end can better receive the electromagnetic waves, and the purpose of improving the transmission efficiency is achieved;
time reversal refers to inversion of motion, and in time reversal electromagnetism, time reversal refers to inversion of signal waveforms; a time-reversal electromagnetic system comprising: the time reversal mirror detects and receives channel information between systems, and carries out time reversal transformation on received signals so as to compensate delay and dispersion generated by the signals in the transmission process of a complex multipath environment, and the purpose of obtaining focused signals at the receiving terminal is achieved; the time reversal transformation implementation method comprises the following steps: based on a digital signal processing technology of discretization sampling, the method can directly carry out sampling processing on time domain signals or carry out phase conjugation processing on the time domain signals by transforming the time domain signals to a frequency domain, and then carry out inverse Fourier transform to the time domain to realize signal time reversal transform; typical digital signal processing systems are generally: input signal x (t) -analog-to-digital conversion device-digital signal processing system-digital-to-analog conversion device-output signal x (-t); simply speaking, a signal is transmitted out through a specific channel in the air, then the signal is inverted, the signal can return along the original channel, and a receiving end can receive a focusing signal; the signal amplification is to amplify the signal in equal proportion and then normalize the signal.
The complex environment added by the invention, namely a plurality of metal objects equivalent to tables and chairs, not only can not influence the final power synthesis effect, but also can enhance the final required power synthesis effect, because in the complex environment, the time reversal mirror can receive signals transmitted by a plurality of channels, and in a simple free space, the channel is single, the advantages brought by multipath channels, namely time reversal operation, can more completely receive channel information, and the final time reversal effect is better.
Example 2
The invention discloses a method for adapting to complex environment, which can not change the method.
Claims (6)
1. An electromagnetic pulse power synthesis technology based on time reversal is characterized in that: the system comprises a channel detection signal generator for generating a channel detection signal; the time reversal mirror is used for carrying out time reversal operation on the received channel detection signal; the strong electromagnetic pulse space power receiver is used for receiving the strong electromagnetic pulse synthesized by the technology.
2. The time-reversal based electromagnetic pulse power synthesis technique of claim 1, wherein: the indoor environment is metal walls which can be equivalent at the periphery.
3. The time-reversal based electromagnetic pulse power synthesis technique of claim 2, wherein: complex environments represent a plurality of objects that can reflect electromagnetic waves.
4. The time-reversal based electromagnetic pulse power synthesis technique of claim 1, wherein: the number of the channel detection signal generators is defined by users, and can be a plurality of the channel detection signal generators and one channel detection signal generator.
5. The time-reversal based electromagnetic pulse power synthesis technique of claim 1, wherein: the time reversal mirror is a device for time reversal operation of signals and an antenna array is used for transmitting reversed signals.
6. An electromagnetic pulse power synthesis technology based on time reversal is characterized in that: the method comprises the following steps:
step 1: the channel detection signal generator transmits a channel detection signal S (t);
step 2: a time reversal mirror receives a channel detection signal S (t) and a receiving signal H (t) formed after the channel detection signal S (t) is scattered by a complex indoor environment;
and step 3: inverting and amplifying the received signal H (t) to obtain a signal C (t) which is sent to an antenna array;
and 4, step 4: after the antenna array sends a signal C (t), the signal C (t) is converted into a focusing signal L (t) through an original channel to carry out indoor complex environment broadband strong electromagnetic pulse space power synthesis.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114841179A (en) * | 2022-05-31 | 2022-08-02 | 电子科技大学 | Sensing system based on RFID and time reversal electromagnetism |
| CN114900249A (en) * | 2022-04-28 | 2022-08-12 | 中国电子科技集团公司第三十六研究所 | Complex environment electromagnetic situation inversion method based on multiple sensors |
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Cited By (2)
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| CN114900249A (en) * | 2022-04-28 | 2022-08-12 | 中国电子科技集团公司第三十六研究所 | Complex environment electromagnetic situation inversion method based on multiple sensors |
| CN114841179A (en) * | 2022-05-31 | 2022-08-02 | 电子科技大学 | Sensing system based on RFID and time reversal electromagnetism |
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