CN114487523A - Distributed microwave radiation source field intensity coherent synthesis method and system - Google Patents
Distributed microwave radiation source field intensity coherent synthesis method and system Download PDFInfo
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Abstract
The invention discloses a field intensity coherent synthesis method and a field intensity coherent synthesis system of a distributed microwave radiation source, which are used for improving the radiation field power density at a target, obtaining the high-peak microwave field intensity of a local area, being used for research and application such as field intensity tolerance assessment of a target object and the like, and solving the problems that the array field intensity synthesis has a constraint requirement on the array configuration and the synthesis efficiency is reduced under the near field condition. The method comprises the steps of receiving radiation signals emitted by each semiconductor microwave radiation source by constructing a phase and delay measurement system, and estimating the time difference and the phase difference of the radiation signals of each semiconductor microwave radiation source reaching a target position in a signal processing mode. The time difference and the phase difference of the radiation signals of the semiconductor microwave radiation sources reaching the target position are compensated by changing the time delay and the phase of the excitation signals of the semiconductor microwave radiation sources, so that the amplitude and the phase of the radiation signals of the semiconductor microwave radiation sources reaching the target position are consistent, and the coherence enhancement of the radiation field at the target position is realized.
Description
Technical Field
The invention relates to a field intensity coherent synthesis system construction method of a distributed microwave radiation source, which is used for improving the radiation field power density at a target to obtain the high-peak microwave field intensity of a local area and can be used for research and application such as target object tolerance field intensity examination.
Background
At present, vacuum electronic devices such as klystrons are commonly used as microwave sources in laboratories, and strong electromagnetic radiation is generated through power synthesis and is used for the examination and research of the tolerance field intensity of targets. However, the vacuum electronic device needs a high voltage pulse generator to generate strong electromagnetic radiation, and the system is complicated.
In recent years, semiconductor microwave device materials and process technology have made breakthrough progress, and the output power of semiconductor microwave devices is higher and higher, and the semiconductor microwave devices have the potential of further improving the output power through material, process and design improvement. The semiconductor microwave device belongs to an amplifying system, and when power synthesis is carried out, waveform control, delay control and phase control of radiation signals are easier to realize. Therefore, a plurality of semiconductor microwave devices can be used as radiation sources to generate strong electromagnetic radiation by a field intensity coherent synthesis method, and compared with a strong electromagnetic radiation generating system using a vacuum electronic device as a microwave source, the system is simpler and is flexible in configuration. However, in the present phased array microwave source constructed by using the semiconductor microwave device, the radiation capability of all radiation sources is not effectively synthesized in the near field region of the antenna, so that the synthesis efficiency of the near field strength of the antenna is low.
Disclosure of Invention
The invention aims to provide a field intensity coherent synthesis method and a field intensity coherent synthesis system of a distributed microwave radiation source, which overcome the constraint requirement of array field intensity synthesis on array configuration and the problem of synthesis efficiency reduction under the near field condition.
The conception of the invention is as follows:
the method comprises the steps of receiving radiation field signals formed by radiation signals emitted by each semiconductor microwave radiation source at a target position, namely a receiving antenna, by constructing a phase and delay measurement system, and estimating the time difference and the phase difference of the radiation signals of each semiconductor microwave radiation source reaching the target position in a signal processing mode. The time difference and the phase difference of the radiation signals of each semiconductor microwave radiation source reaching the target position are compensated by changing the time delay and the phase of the excitation signals of each semiconductor microwave radiation source, so that the amplitude and the phase of the radiation signals of each semiconductor microwave radiation source reaching the target position are consistent, the radiation capability of all semiconductor microwave radiation sources is fully exerted, and the coherence enhancement of the radiation field at the target position is realized.
The technical scheme of the invention is as follows:
a coherent field strength synthesis method of a distributed microwave radiation source is characterized by comprising the following steps:
step 1, constructing a system;
the system comprises a frequency synthesis system, N semiconductor microwave radiation sources arranged in any mode, a receiving antenna and a receiver;
the signal output end of the frequency synthesis system is electrically connected with the signal input ends of the N semiconductor microwave radiation sources which are arranged in any mode;
the receiving antenna is positioned at the target position and is electrically connected with the receiver;
step 2, processing the radiation field waveform at the target position, and calculating the time difference and the phase difference of the radiation signals emitted by each semiconductor microwave radiation source reaching the target position;
step 2.1, generating by using a frequency synthesis system, outputting N paths of different excitation signals through a signal output end of the frequency synthesis system, and respectively using the different excitation signals as excitation signals of N semiconductor microwave radiation sources; due to the different transmission distances between the frequency synthesizer system and the different semiconductor microwave radiation sources, different signal delays and additional phases occur between the respective excitation signals.
2.2, each semiconductor microwave radiation source receives the respective excitation signal, amplifies the excitation signal and radiates the amplified excitation signal to a target position, and a radiation field signal is formed at the target position; due to the different distances between the individual semiconductor microwave radiation sources and the target position, the respective radiation signals will also have different signal delays and additional phases.
Step 2.3, the receiving antenna carries out induction measurement on the radiation field signal at the target position and sends the radiation field signal to the receiver;
step 2.4, the receiver carries out separation processing on the received radiation field signals to obtain radiation signals corresponding to each semiconductor microwave radiation source;
step 2.5, calculating the time difference and the phase difference of the radiation signals of each semiconductor microwave radiation source reaching the target position by comparing the radiation signals corresponding to each semiconductor microwave radiation source;
and 3, adjusting the delay and phase of the excitation signal of each semiconductor microwave radiation source based on the time difference and phase difference of the radiation signal of each semiconductor microwave radiation source reaching the target position calculated in the step 2, further adjusting the delay and phase of the radiation signal of each semiconductor microwave radiation source, and compensating the time difference and phase difference of the radiation signal of each semiconductor microwave radiation source reaching the target position, so that the amplitude value and the phase of the radiation signal of each semiconductor microwave radiation source reaching the target position are consistent, and the coherence enhancement of the radiation field at the target position is realized.
Further, the intermediate frequency integrated system in the step 1 has N signal output terminals, and each signal output terminal is electrically connected to a signal input terminal of each of the 1 semiconductor microwave radiation sources.
Further, in the step 1, the signal output end of the frequency synthesizer system is connected with the signal input ends of the N semiconductor microwave radiation sources which are arranged in any mode through a radio frequency feeder; for the case that the frequency synthesis system is far away from the semiconductor microwave radiation source, the signal output end of the frequency synthesis system is connected with the signal input ends of the N semiconductor microwave radiation sources arranged in any mode through optical fibers, and the excitation signals can be modulated through optical signals and transmitted through the optical fibers.
Further, in step 1, a radio frequency front end is also arranged between the receiving antenna and the receiver; and 2.3, after the receiving antenna carries out induction measurement on the radiation field signal at the target position, carrying out method filtering processing on the radiation field signal through the radio frequency front end, and then sending the radiation field signal to the receiver.
Further, in step 1, a receiving antenna is connected with a receiver through a radio frequency cable; for the case that the target position is far away from the receiver, the receiving antenna is connected with the receiver through an optical fiber, and the radio frequency signal can be modulated through the optical signal and transmitted through the optical fiber.
Further, in step 2.1, the N excitation signals are orthogonal signals with the same center frequency and different modulation orthogonal codes.
Further, step 2.4 specifically includes:
step 2.41, the receiver performs operations such as amplification, filtering, down-conversion, automatic gain control, digital sampling and digital signal processing on the received radiation field signal to obtain a complex baseband signal;
and 2.42, processing the complex baseband signals by using a matching receiving processing algorithm corresponding to each excitation signal, and separating the radiation signals corresponding to each semiconductor microwave radiation source.
Further, step 2.5 specifically uses the following formula to calculate the time difference of the radiation signal of each semiconductor microwave radiation source reaching the target position
Phase difference of sum
Wherein, TspanSeparating radiation signals corresponding to each semiconductor microwave radiation source; PSF (τ) is a point spread function whose energy is concentrated around τ -0 in the time domain, Q (τ) is the quadrature phase of the complex baseband signal, and I (τ) is the in-phase of the complex baseband signal.
The invention also provides a field intensity coherent synthesis system of the distributed microwave radiation source, which is characterized in that: the system comprises a frequency synthesis system, N semiconductor microwave radiation sources arranged in any mode, a receiving antenna and a receiver;
the signal output end of the frequency synthesis system is electrically connected with the signal input ends of the N semiconductor microwave radiation sources which are arranged in any mode; the receiving antenna is positioned at the target position and is electrically connected with the receiver;
the frequency synthesis system is used for generating and outputting N paths of different excitation signals which are respectively used as the excitation signals of the N semiconductor microwave radiation sources;
each semiconductor microwave radiation source receives the respective excitation signal, generates a radiation signal after amplification, radiates the radiation signal to a target position, and forms a radiation field signal at the target position;
the receiving antenna is used for sensing and measuring the radiation field signal and transmitting the radiation field signal to the receiver;
the receiver is used for receiving the radiation field signals, performing separation processing to obtain radiation signals corresponding to the semiconductor microwave radiation sources, and calculating time difference and phase difference of the radiation signals of the semiconductor microwave radiation sources reaching the target position.
Furthermore, the frequency synthesizer system has N signal output terminals, and each signal output terminal is electrically connected with the signal input terminal of 1 semiconductor microwave radiation source.
Furthermore, the signal output end of the frequency synthesis system is connected with the signal input ends of the N semiconductor microwave radiation sources which are arranged in any mode through a radio frequency feeder; for the case that the frequency synthesis system is far away from the semiconductor microwave radiation source, the signal output end of the frequency synthesis system is connected with the signal input ends of the N semiconductor microwave radiation sources arranged in any mode through optical fibers, and the excitation signals can be modulated through optical signals and transmitted through the optical fibers.
Furthermore, a radio frequency front end is arranged between the receiving antenna and the receiver.
Furthermore, the receiving antenna is connected with the receiver through a radio frequency cable; for the case that the target position is far away from the receiver, the receiving antenna is connected with the receiver through an optical fiber, and the radio frequency signal can be modulated through the optical signal and transmitted through the optical fiber.
Furthermore, the receiver comprises a variable attenuator, a limiting low noise amplifier, a band-pass filter, a down-conversion module, a gain control module, an AD sampling module, a digital pre-selection filter and a digital quadrature down-conversion module which are connected in sequence;
the variable attenuator is used for adjusting the power of the radiation field signal;
the amplitude limiting low-noise amplifier is used for amplifying the radiation field signal processed by the variable attenuator;
the band-pass filter is used for filtering the amplified radiation field signal;
the down-conversion module is used for performing down-conversion on the filtered radiation field signal;
the gain control module is used for carrying out automatic gain control on the radiation field signal after the down-conversion;
the AD sampling module is used for converting the radiation field signal after automatic gain control into a digital signal;
the digital pre-selection filtering is used for image interference suppression before quadrature down-conversion;
the digital quadrature down-conversion module is used for converting the digital signal into a corresponding complex baseband signal.
The invention has the beneficial effects that:
1. according to the invention, the radiation signals of each semiconductor microwave radiation source are measured and analyzed, the time delay and the phase of the excitation signal of each semiconductor microwave radiation source are adjusted, the time delay and the phase of the radiation signal of each semiconductor microwave radiation source are further adjusted, the time difference and the phase difference of the radiation signal of each semiconductor microwave radiation source reaching the target position are compensated, the amplitude value and the phase of the radiation signal of each semiconductor microwave radiation source reaching the target position are consistent, and the coherent enhancement of the radiation field at the target position is realized. The radiation capability of all semiconductor-based microwave radiation sources is fully exerted, the spatial field coherence enhancement of all radiation sources is realized, and a stronger radiation field can be obtained compared with a phased array microwave source.
2. The invention has no large constraint on the arrangement of each radiation source and has simple arrangement process.
Drawings
FIG. 1 is a schematic diagram of a coherent combining system for field intensity of a distributed microwave radiation source in an embodiment;
FIG. 2 is a schematic diagram illustrating a connection of a receiving antenna, a radio frequency front end and a receiver in a coherent combining system of field strengths of distributed microwave radiation sources in an embodiment;
FIG. 3 is a block diagram of a receiver in a coherent combining system of field intensity of a distributed microwave radiation source in the embodiment;
FIG. 4 is a schematic diagram of signal transmission and processing in an embodiment;
FIG. 5 is a schematic view of a radiation field enhancement region of the present invention;
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, specific embodiments accompanied with figures are described in detail below, and it is apparent that the described embodiments are a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making creative efforts based on the embodiments of the present invention, shall fall within the protection scope of the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described and will be readily apparent to those of ordinary skill in the art without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.
The invention discloses a field intensity coherent synthesis method of a distributed microwave radiation source, which is used for improving the power density of a radiation field at a target, obtaining the high-peak microwave field intensity of a local area, and being used for research and application such as field intensity assessment of a target object. The basic idea is to receive signal waveforms at a target simultaneously by constructing a system, and estimate the time difference and phase difference of each radiation source reaching the target by means of signal processing. By changing the time delay and the phase of the excitation signals of the radiation sources, the radiation field coherence enhancement at the target is realized.
Examples
The field strength coherent synthesis method of the distributed microwave radiation source of the present embodiment is described in detail below with reference to the accompanying drawings:
firstly, constructing a system, and establishing time synchronization and phase locking physical channels among all semiconductor microwave radiation sources;
physical channels of time synchronization and phase locking need to be established among all semiconductor microwave radiation sources, so that the radiation signal delay and phase control of all the radiation sources are realized, and the coherence enhancement at a specific position is realized. The invention independently generates the excitation signals of each semiconductor microwave radiation source by constructing a system and utilizing a frequency synthesis system. As shown in fig. 1, the system constructed for the present invention includes a plurality of semiconductor microwave radiation sources, a receiving antenna, receiver and frequency synthesizer system. It can be seen from the figure that the plurality of semiconductor microwave radiation sources of the present invention are arranged in any manner. The signal output end of the frequency synthesis system is electrically connected with the signal input ends of the N semiconductor microwave radiation sources which are arranged in any mode; the receiving antenna is located at the target location and is electrically connected to the receiver.
Secondly, processing the radiation field waveform at the target position, and calculating the time difference and the phase difference of the radiation signals emitted by each semiconductor microwave radiation source reaching the target position;
the excitation signal of each semiconductor microwave radiation source is generated by using a frequency synthesis system, and the excitation signal of each semiconductor microwave radiation source is required to be generated independently, and the waveform is completely controllable. Each excitation signal in this embodiment is an orthogonal signal having the same center frequency and different orthogonal codes, and in other embodiments, other forms of signals may also be used.
Taking two semiconductor microwave radiation sources as an example, the frequency synthesizer system generates two different excitation signals:
wherein f iscIs the center frequency of the frequency band, and is,
and
are the two up-converted equivalent local oscillator reference phases. P1(τ) and P2(τ) are two orthogonal codes, satisfying:
where "×" is a convolution sign, PSF (τ) is a point spread function whose energy is concentrated around τ 0 in the time domain.
The excitation signal is transmitted to the corresponding semiconductor microwave radiation source through a radio frequency feeder. For the case of a far distance between the radiation source and the frequency synthesizer system, the excitation signal can be modulated by an optical signal and transmitted through an optical fiber. Due to the different transmission distances between the frequency synthesizer system and the different semiconductor microwave radiation sources, different signal delays and additional phases occur between the individual excitation signals.
After receiving the excitation signal, each semiconductor microwave radiation source amplifies the excitation signal and radiates the excitation signal to a target position, where for convenience of distinction, a signal radiated by each semiconductor microwave radiation source is referred to as a radiation signal. The signal at the target location is denoted as the radiated field signal. Due to the different distances of the individual semiconductor microwave radiation sources from the target location, the respective radiation signals will also produce different signal delays and additional phases. Therefore, after the two excitation signals are amplified and radiated, the signals at the target position are:
wherein, tau1And τ2Is the delay of the signal propagation.
An antenna at the target location performs inductive measurements of the radiated field signal. The antenna selection principle in this embodiment requires the use of an electrically small antenna to reduce its effect on the propagation of the electromagnetic field. Meanwhile, the wave arrival directions of the semiconductor microwave radiation sources relative to the target position are different in the method. In selecting an antenna, a wide-angle receiving antenna should be selected. The semiconductor microwave radiation sources are dispersed at all angles of the receiving antenna, the electrically small antenna is close to the omnidirectional antenna, the gain directional diagram is close to all directions, and the phase directional diagram is close to all directions similarly. In order to improve the coherence enhancement effect of the method, the phase pattern of the antenna can be calibrated into the system if necessary. The phase directional diagram can be obtained by simulation, test and other methods.
As shown in fig. 2, in this embodiment, a radio frequency front end is further disposed between the antenna and the receiver, and includes a variable attenuator and a limiting low noise amplifier, so as to adjust the level of the radiated field signal, and then transmit the signal to the receiver, and the signal may be transmitted by using a radio frequency cable. For the case where the target location is far from the receiver, the radio frequency signal may be modulated by an optical signal and transmitted through an optical fiber. The propagation delays of the signals from the receive antennas to the receiver are perfectly uniform. Therefore, the signals of the radiated field signals arriving at the receiver are:
wherein, tauLThe signal passed from the receive antenna to the receiver is delayed.
Since the signals generated by different semiconductor microwave radiation sources are orthogonal waveforms that may reach the target location simultaneously in time, the signal waveforms may generate large envelope fluctuations. To ensure true restoration of the signal, the instantaneous dynamic range of the receiver needs to be large enough, 14bit quantization can be used, and the effective dynamic range of the receiver exceeds 75 dB. As shown in fig. 3, the receiver of this embodiment includes a variable attenuator, a limiting low noise amplifier, a band-pass filter, a down-conversion module, a gain control module, an AD sampling module, a digital pre-selection filter, and a digital quadrature down-conversion module, which are connected in sequence; the local oscillator and sampling clock requirements are generated by the frequency synthesizer system. Sequentially carrying out operations such as power adjustment, amplification, filtering, down-conversion, automatic gain control, digital sampling, digital signal processing and the like on the two radiation field signals to obtain a complex baseband signal of formula (5):
wherein the content of the first and second substances,
the reference phase of the down-conversion local oscillator is consistent for all radiation signals because each radiation source receives the same receiving channel. The stationary phase part is as follows:
accordingly, formula (7) is expressed as:
comparing the two signals in (7) usingm1,τm2And
describing its time and phase differences:
as shown in fig. 4, the complex baseband signal is processed by using a matched receive processing algorithm corresponding to each excitation signal, and the radiation signals corresponding to the respective semiconductor microwave radiation sources are separated.
And estimating the time difference and the phase difference caused by the difference of the distances from the radiation source to the target by a signal processing method. The specific calculation method may employ:
wherein, TspanSeparating radiation signals corresponding to each semiconductor microwave radiation source; PSF (τ) is a point spread function whose energy in the time domain is concentrated near τ ═ 0, Q (τ) is the quadrature phase of the complex baseband signal, and I (τ) is the in-phase of the complex baseband signal. If T is the effective width after pulse compression, it can be set in practice:
on the basis of the measurement, the signal delay and the phase of each radiation source are changed by adjusting the excitation signal of the frequency synthesis system. The time delay and the phase of the excitation signal of the semiconductor microwave radiation source 1 can be unchanged, and the time delay and the phase of the semiconductor microwave radiation source 2 can be adjusted.
Wherein the baseband orthogonal code of the signal is changed to P (τ). The waveform may be a separately designed waveform or a rectangular pulse waveform.
The two signals are transmitted through a radio frequency feeder line and a space, and electromagnetic fields reaching a target position are respectively as follows:
obtained by formula (13)
As can be seen from the formula, the two radiation sources are consistent in amplitude and phase at the target position, and coherence enhancement is realized.
The frequency synthesizer is subjected to delay and phase compensation setting, each radiation source uses the same baseband waveform, the initial phase and the time delay are adjusted to radiate a target position, phase compensation can be realized on an intermediate frequency signal, and the phase compensation can also be realized by controlling the local oscillator signal phase of direct digital up-conversion (DDS) and other modes. The radiation waveform realized by the method can realize coherent enhancement of the field intensity at the target.
The interference enhancement realized by the invention is essentially different from the synthesis of a directional diagram of a phased array in the prior art, and for a 'large antenna' consisting of a plurality of radiation source antenna baselines, the target is equivalent to the near field of the 'large antenna'. In this region, a uniform plane wave is not achieved. The method is characterized in that the time delay and the phase of each radiation source are controlled, so that the field intensity enhancement is realized at the target position. Fig. 5 analyzes the influence of the size of the enhancement region, where θ is the maximum opening angle of the radiation source centered at the target position. The size of the enhanced region is 0.22 m calculated by taking the central frequency as 8GHz and the field angle theta as 5 degrees. In order to ensure the uniformity of the radiation field, there is a certain constraint on the field angle under the condition of specific frequency.
Claims (14)
1. A coherent field strength synthesis method of a distributed microwave radiation source is characterized by comprising the following steps:
step 1, constructing a system;
the system comprises a frequency synthesis system, N semiconductor microwave radiation sources arranged in any mode, a receiving antenna and a receiver; wherein N is a positive integer greater than or equal to 2;
the signal output end of the frequency synthesis system is electrically connected with the signal input ends of the N semiconductor microwave radiation sources which are arranged in any mode;
the receiving antenna is positioned at the target position and is electrically connected with the receiver;
step 2, processing the radiation field waveform at the target position, and calculating the time difference and the phase difference of the radiation signals of each semiconductor microwave radiation source reaching the target position;
step 2.1, generating by using a frequency synthesis system, outputting N paths of different excitation signals through a signal output end of the frequency synthesis system, and respectively using the different excitation signals as excitation signals of N semiconductor microwave radiation sources;
2.2, each semiconductor microwave radiation source receives the respective excitation signal, amplifies the excitation signal and radiates the amplified excitation signal to a target position, and a radiation field signal is formed at the target position;
step 2.3, the receiving antenna carries out induction measurement on the radiation field signal at the target position and sends the radiation field signal to the receiver;
step 2.4, the receiver carries out separation processing on the received radiation field signals to obtain radiation signals corresponding to each semiconductor microwave radiation source;
step 2.5, calculating the time difference and the phase difference of the radiation signals of each semiconductor microwave radiation source reaching the target position by comparing the radiation signals corresponding to each semiconductor microwave radiation source;
and 3, adjusting the delay and phase of the excitation signal of each semiconductor microwave radiation source based on the time difference and phase difference of the radiation signal of each semiconductor microwave radiation source reaching the target position calculated in the step 2, further adjusting the delay and phase of the radiation signal of each semiconductor microwave radiation source, and compensating the time difference and phase difference of the radiation signal of each semiconductor microwave radiation source reaching the target position, so that the amplitude value and the phase of the radiation signal of each semiconductor microwave radiation source reaching the target position are consistent, and the coherence enhancement of the radiation field at the target position is realized.
2. The coherent field strength synthesis method of a distributed microwave radiation source of claim 1, wherein: the intermediate frequency comprehensive system in the step 1 is provided with N signal output ends, and each signal output end is electrically connected with the signal input end of each semiconductor microwave radiation source.
3. The coherent combining method of field strength of distributed microwave radiation sources of claim 2, characterized in that: in step 1, the signal output end of the frequency synthesis system and the signal input ends of the N semiconductor microwave radiation sources arranged in any mode are connected through a radio frequency feeder line, or a radio frequency signal is modulated to light intensity change and is connected through an optical fiber.
4. A method of coherent synthesis of field strength for a distributed microwave radiation source as claimed in any one of claims 1 to 3, characterized in that: in step 1, a radio frequency front end is arranged between a receiving antenna and a receiver; and 2.3, after the receiving antenna carries out induction measurement on the radiation field signal at the target position, carrying out method filtering processing on the radiation field signal through the radio frequency front end, and then sending the radiation field signal to the receiver.
5. The coherent field strength synthesis method of a distributed microwave radiation source of claim 4, wherein: in step 1, the receiving antenna is connected with the receiver through a radio frequency cable or an optical fiber.
6. The coherent field strength synthesis method of a distributed microwave radiation source of claim 5, wherein: in step 2.1, the N excitation signals are orthogonal signals having the same center frequency and different modulation orthogonal codes.
7. The coherent field strength synthesis method of a distributed microwave radiation source according to claim 6, characterized in that step 2.4 specifically comprises:
step 2.41, the receiver performs amplification, filtering, down-conversion, automatic gain control, digital sampling and digital signal processing operations on the received radiation field signal to obtain a complex baseband signal;
and 2.42, processing the complex baseband signals by using a matching receiving processing algorithm corresponding to each excitation signal, and separating out the radiation signals corresponding to each semiconductor microwave radiation source.
8. The coherent field strength synthesis method of a distributed microwave radiation source of claim 7, wherein:
step 2.5, calculating the time difference and the phase difference of the radiation signals of each semiconductor microwave radiation source reaching the target position by adopting the following formula:
wherein, TspanSeparating radiation signals corresponding to each semiconductor microwave radiation source; PSF (τ) is a point spread function whose energy is concentrated around τ -0 in the time domain, Q (τ) is the quadrature phase of the complex baseband signal, and I (τ) is the in-phase of the complex baseband signal.
9. A field intensity coherent synthesis system of a distributed microwave radiation source is characterized in that: the system comprises a frequency synthesis system, N semiconductor microwave radiation sources arranged in any mode, a receiving antenna and a receiver;
the signal output end of the frequency synthesis system is electrically connected with the signal input ends of the N semiconductor microwave radiation sources which are arranged in any mode; the receiving antenna is positioned at the target position and is electrically connected with the receiver;
the frequency synthesis system is used for generating and outputting N paths of different excitation signals which are respectively used as the excitation signals of the N semiconductor microwave radiation sources;
each semiconductor microwave radiation source receives the respective excitation signal, generates a radiation signal after amplification, radiates the radiation signal to a target position, and forms a radiation field signal at the target position;
the receiving antenna is used for sensing and measuring the radiation field signal and transmitting the radiation field signal to the receiver;
the receiver is used for receiving the radiation field signals, performing separation processing to obtain radiation signals corresponding to the semiconductor microwave radiation sources, and calculating time difference and phase difference of the radiation signals of the semiconductor microwave radiation sources reaching the target position.
10. The coherent field strength combining system of a distributed microwave radiation source of claim 9, wherein: the frequency synthesis system is provided with N signal output ends, and each signal output end is electrically connected with the signal input end of each semiconductor microwave radiation source.
11. The coherent field strength combining system of a distributed microwave radiation source of claim 10, wherein: the signal output end of the frequency synthesis system is connected with the signal input ends of the N semiconductor microwave radiation sources which are arranged in any mode through a radio frequency feeder line, or a radio frequency signal is modulated to light intensity change and is connected through an optical fiber.
12. The coherent field strength combining system of a distributed microwave radiation source of claim 11, wherein: and a radio frequency front end is also arranged between the receiving antenna and the receiver.
13. The coherent field strength combining system of a distributed microwave radiation source of claim 12, wherein: the receiving antenna is connected with the receiver through a radio frequency cable or an optical fiber.
14. The coherent field strength combining system of a distributed microwave radiation source of claim 13, wherein: the receiver comprises a variable attenuator, an amplitude limiting low-noise amplifier, a band-pass filter, a down-conversion module, a gain control module, an AD sampling module, a digital pre-selection filter and a digital quadrature down-conversion module which are sequentially connected;
the variable attenuator is used for adjusting the power of the radiation field signal;
the amplitude limiting low-noise amplifier is used for amplifying the radiation field signal processed by the variable attenuator;
the band-pass filter is used for filtering the amplified radiation field signal;
the down-conversion module is used for performing down-conversion on the filtered radiation field signal;
the gain control module is used for carrying out automatic gain control on the radiation field signal after the down-conversion;
the AD sampling module is used for converting the radiation field signal after automatic gain control into a digital signal;
the digital pre-selection filtering is used for image interference suppression before quadrature down-conversion;
and the digital quadrature down-conversion module is used for converting the digital signal into a complex baseband signal.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN114914694A (en) * | 2022-05-18 | 2022-08-16 | 西北核技术研究所 | High-power microwave phased-array antenna wave-beating radiation method and system |
| CN117081523A (en) * | 2023-10-18 | 2023-11-17 | 四川益丰电子科技有限公司 | Broadband attenuation low-noise amplification multifunctional chip |
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