CN114487523B - Field intensity coherent synthesis method and system of distributed microwave radiation source - Google Patents
Field intensity coherent synthesis method and system of distributed microwave radiation source 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 power density of a radiation field at a target to obtain the high-peak microwave field intensity of a local area, can be used for research and application such as target tolerance field intensity examination and the like, and solve the problems of constraint requirements of array field intensity synthesis on array configuration and reduction of synthesis efficiency under the near field condition. By constructing a phase and delay measuring system, radiation signals emitted by the semiconductor microwave radiation sources are received, and the time difference and the phase difference of the radiation signals of the semiconductor microwave radiation sources reaching the target position are estimated in a signal processing mode. By changing the delay and the phase of the excitation signals of the semiconductor microwave radiation sources, the time difference and the phase difference of the radiation signals of the semiconductor microwave radiation sources reaching the target position are compensated, 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 coherent enhancement of the radiation field at the target position is realized.
Description
Technical Field
The invention relates to a construction method of a field intensity coherent synthesis system of a distributed microwave radiation source, which is used for improving the power density of a radiation field 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 tolerance field intensity assessment.
Background
At present, vacuum electronic devices such as klystrons are commonly used in laboratories as microwave sources, and strong electromagnetic radiation is generated through power synthesis for the investigation of the tolerance field intensity of a target. However, vacuum electronics require an attached high voltage pulse generating device to be able to radiate strongly electromagnetic radiation, and the system is relatively complex.
In recent years, breakthrough progress is made in materials and process technologies of semiconductor microwave devices, and the output power of the semiconductor microwave devices is increased more and more, and the semiconductor microwave devices have the potential of further improving the output power through material, process and design improvements. The semiconductor microwave device belongs to an amplifying system, and is easier to realize waveform control, delay control and phase control of radiation signals when power synthesis is carried out. Therefore, a plurality of semiconductor microwave devices can be adopted as radiation sources, and strong electromagnetic radiation is generated by a field intensity coherent synthesis method, so that the system is simpler and flexible in configuration compared with a strong electromagnetic radiation generating system taking vacuum electronic devices as microwave sources. However, the phased array microwave source constructed by using the semiconductor microwave device at present has no radiation capability of effectively synthesizing all radiation sources in the near field region of the antenna, so that the synthesis efficiency of the near field of the antenna is lower.
Disclosure of Invention
The invention aims to provide a field intensity coherent synthesis method and a field intensity coherent synthesis system for a distributed microwave radiation source, which overcome the constraint requirements 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:
By constructing a phase and delay measuring system, radiation field signals formed by radiation signals emitted by the semiconductor microwave radiation sources at the target position, namely the receiving antenna, are received, and the time difference and the phase difference of the radiation signals of the semiconductor microwave radiation sources reaching the target position are estimated in a signal processing mode. By changing the delay and the phase of the excitation signals of the semiconductor microwave radiation sources, the time difference and the phase difference of the radiation signals of the semiconductor microwave radiation sources reaching the target position are compensated, so that the amplitude and the phase of the radiation signals of the semiconductor microwave radiation sources reaching the target position are consistent, the radiation capacity of all semiconductor microwave radiation sources is fully exerted, and the coherent enhancement of the radiation field at the target position is realized.
The technical scheme of the invention is as follows:
A field intensity coherent 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 synthesizer system, N semiconductor microwave radiation sources, a receiving antenna and a receiver which are arranged in any mode;
the signal output end of the frequency synthesis system is electrically connected with the signal input ends of 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 waveform of the radiation field at the target position, and calculating the time difference and the phase difference of the radiation signals emitted by the semiconductor microwave radiation sources reaching the target position;
Step 2.1, generating by using a frequency synthesizer system and outputting N paths of different excitation signals through a signal output end of the frequency synthesizer system, wherein the N paths of different excitation signals are respectively used as excitation signals of N semiconductor microwave radiation sources; because of the different transmission distances between the frequency synthesizer and the different semiconductor microwave radiation sources, different signal delays and additional phases are generated between the respective excitation signals.
Step 2.2, each semiconductor microwave radiation source receives respective excitation signals, amplifies the excitation signals and irradiates the excitation signals to a target position, and a radiation field signal is formed at the target position; because of the different distances of the individual semiconductor microwave radiation sources from the target location, the individual radiation signals also produce 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 performs separation processing on the received radiation field signals to obtain radiation signals corresponding to the semiconductor microwave radiation sources;
Step 2.5, calculating the time difference and the phase difference of the radiation signals of the semiconductor microwave radiation sources reaching the target position by comparing the radiation signals corresponding to the semiconductor microwave radiation sources;
And 3, adjusting the delay and the phase of the excitation signals of the semiconductor microwave radiation sources based on the time difference and the phase difference of the radiation signals of the semiconductor microwave radiation sources reaching the target position calculated in the step 2, further adjusting the delay and the phase of the radiation signals of the semiconductor microwave radiation sources, compensating the time difference and the phase difference of the radiation signals of the semiconductor microwave radiation sources reaching the target position, enabling the amplitude and the phase of the radiation signals of the semiconductor microwave radiation sources reaching the target position to be consistent, and realizing the coherent enhancement of the radiation field at the target position.
Further, the intermediate frequency integrated system in step 1 is provided with N signal output ends, and each signal output end is electrically connected with the signal input ends of the 1 semiconductor microwave radiation sources respectively.
In step 1, the signal output end of the frequency synthesis system is connected with the signal input ends of N semiconductor microwave radiation sources which are arranged in any mode through radio frequency feeder lines; for the situation that the frequency synthesis system and the semiconductor microwave radiation sources are far away from each other, the signal output ends of the frequency synthesis system are connected with the signal input ends of N semiconductor microwave radiation sources which are arranged in any mode through optical fibers, and excitation signals can be modulated through optical signals and transmitted through the optical fibers.
Further, in step 1, a radio frequency front end is further disposed between the receiving antenna and the receiver; in step 2.3, after the receiving antenna performs induction measurement on the radiation field signal at the target position, the radiation field signal is filtered by the radio frequency front end and then sent to the receiver.
Further, in step 1, a receiving antenna is connected with a receiver through a radio frequency cable; for the situation that the target position and the receiver are far away, the receiving antenna is connected with the receiver through the optical fiber, and radio frequency signals can be modulated through the optical signals and transmitted through the optical fiber.
Further, in step 2.1, the N excitation signals are orthogonal signals having the same center frequency and different modulation orthogonal codes.
Further, step 2.4 specifically includes:
Step 2.41, the receiver amplifies, filters, down-converts, automatically controls gain, digitally samples and processes the received radiation field signal to obtain a complex baseband signal;
and 2.42, processing the complex baseband signals by utilizing a matching receiving processing algorithm corresponding to each excitation signal, and separating out radiation signals corresponding to the semiconductor microwave radiation sources.
Further, step 2.5 specifically calculates the time difference between the arrival of the radiation signal of each semiconductor microwave radiation source at the target position using the following methodAnd phase difference/>
Wherein, T span is to separate out the corresponding radiation signals of each semiconductor microwave radiation source; PSF (τ) is a point spread function whose energy is concentrated near 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 combining system of the distributed microwave radiation source, which is characterized in that: the device comprises a frequency synthesizer system, N semiconductor microwave radiation sources, a receiving antenna and a receiver which are arranged in any mode;
the signal output end of the frequency synthesis system is electrically connected with the signal input ends of 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 N semiconductor microwave radiation sources;
each semiconductor microwave radiation source receives respective excitation signals, generates radiation signals after amplification, radiates the radiation signals to a target position, and forms radiation field signals at the target position;
the receiving antenna is used for sensing and measuring radiation field signals and transmitting the radiation field signals 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 the time difference and the phase difference of the radiation signals of the semiconductor microwave radiation sources reaching the target position.
Further, the frequency synthesizer system is provided with N signal output ends, and each signal output end is electrically connected with the signal input ends of the 1 semiconductor microwave radiation sources respectively.
Further, the signal output end of the frequency synthesis system is connected with the signal input ends of N semiconductor microwave radiation sources which are arranged in any mode through radio frequency feeder lines; for the situation that the frequency synthesis system and the semiconductor microwave radiation sources are far away from each other, the signal output ends of the frequency synthesis system are connected with the signal input ends of N semiconductor microwave radiation sources which are arranged in any mode through optical fibers, and excitation signals can be modulated through optical signals and transmitted through the optical fibers.
Further, a radio frequency front end is also arranged between the receiving antenna and the receiver.
Further, the receiving antenna is connected with the receiver through a radio frequency cable; for the situation that the target position and the receiver are far away, the receiving antenna is connected with the receiver through the optical fiber, and radio frequency signals can be modulated through the optical signals and transmitted through the optical fiber.
Further, 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 filtering module and a digital quadrature down-conversion module which are connected in sequence;
the variable attenuator is used for carrying out power adjustment on the radiation field signal;
the amplitude limiting low noise amplifier is used for amplifying the radiation field signals processed by the variable attenuator;
the band-pass filter is used for filtering the amplified radiation field signals;
The down-conversion module is used for down-converting the filtered radiation field signals;
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 beneficial effects of the invention are as follows:
1. According to the method, the radiation signals of the semiconductor microwave radiation sources are measured and analyzed, the delay and the phase of the excitation signals of the semiconductor microwave radiation sources are adjusted, the delay and the phase of the radiation signals of the semiconductor microwave radiation sources are further adjusted, the time difference and the phase difference of the radiation signals of the semiconductor microwave radiation sources reaching the target position are compensated, the amplitude and the phase of the radiation signals of the semiconductor microwave radiation sources reaching the target position are consistent, and the coherent enhancement of the radiation field at the target position is realized. The radiation capacity of all semiconductor-based microwave radiation sources is fully exerted, the spatial field coherence enhancement of all the radiation sources is realized, and a stronger radiation field can be obtained relative to a phased array microwave source.
2. The invention has no great constraint on the array of each radiation source, and the layout process is simple.
Drawings
FIG. 1 is a schematic diagram of a distributed microwave radiation source field strength coherent combining system in an embodiment;
FIG. 2 is a schematic diagram illustrating connection of a receiving antenna, a radio frequency front end, and a receiver in a distributed microwave radiation source field strength coherent combining system according to an embodiment;
FIG. 3 is a block diagram of a receiver in a distributed microwave radiation source field strength coherent combining system in accordance with an embodiment;
FIG. 4 is a schematic diagram of a signal transmission and processing procedure in an embodiment;
FIG. 5 is a schematic illustration of a radiation field enhanced region of the present invention;
Detailed Description
So that the manner in which the above recited objects, features and advantages of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the 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 other than those described herein, and persons skilled in the art will readily appreciate that 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 can be used for research and application such as target tolerance field intensity assessment. The basic idea is that by constructing a system, receiving the signal waveform at the target at the same time, and estimating the time difference and the phase difference of each radiation source reaching the target by means of signal processing. By varying the delay and phase of the excitation signals of the individual radiation sources, a coherent enhancement of the radiation field at the target is achieved.
Examples
The field intensity coherent combining 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 a physical channel for time synchronization and phase locking among semiconductor microwave radiation sources;
Physical channels for time synchronization and phase locking are needed to be established among the semiconductor microwave radiation sources, so that the radiation signal delay and phase control of the radiation sources are realized, and the coherence enhancement at a specific position is realized. The invention uses the frequency integration system to independently generate the excitation signals of the semiconductor microwave radiation sources by constructing the system. As shown in fig. 1, a system constructed in accordance with the present invention includes a plurality of semiconductor microwave radiation sources, a receiving antenna, a receiver, and a frequency synthesizer. As can be seen from the figure, 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 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 antenna.
Secondly, processing the waveform of the radiation field at the target position, and calculating the time difference and the phase difference of the radiation signals emitted by the semiconductor microwave radiation sources reaching the target position;
The excitation signal of each semiconductor microwave radiation source is generated by a frequency synthesis system, the excitation signal of each semiconductor microwave radiation source is required to be generated independently, and the waveform is completely controllable. In this embodiment, each excitation signal is an orthogonal signal with the same center frequency and different orthogonal codes, and in other embodiments, other signals may also be used.
Taking two semiconductor microwave radiation sources as an example, the frequency synthesis system generates two different excitation signals:
wherein f c is the center frequency, And/>Is the equivalent of two up-converted local oscillator reference phases. P 1 (τ) and P 2 (τ) are two orthogonal codes, satisfying:
where "×" is a convolution symbol, PSF (τ) is a point spread function whose energy is concentrated near τ=0 in the time domain.
The excitation signal is transmitted to the corresponding semiconductor microwave radiation source through a radio frequency feed line. For the case of a radiation source and a frequency synthesis system which are far away from each other, the excitation signal can be modulated by an optical signal and transmitted by an optical fiber. Because of the different transmission distances between the frequency synthesizer and the different semiconductor microwave radiation sources, different signal delays and additional phases are generated between the respective excitation signals.
After each semiconductor microwave radiation source receives the excitation signal, the excitation signal is amplified and radiated to the target position, and the signal radiated by the semiconductor microwave radiation source is recorded as a radiation signal for the convenience of distinguishing. The signal at the target location is noted as a radiation field signal. Because of the different distances of the individual semiconductor microwave radiation sources from the target location, the individual radiation signals also produce different signal delays and additional phases. Thus, after the two excitation signals are amplified and radiated, the signals at the target position are:
Where τ 1 and τ 2 are delays of signal propagation.
An antenna at the target location inductively measures the radiated field signal. The antenna in this embodiment is selected in such a way that it is required to use an electrically small antenna to reduce its effect on the propagation of the electromagnetic field. At the same time, it is considered that the arrival direction of each semiconductor microwave radiation source with respect to the target position is different in the present method. In selecting the antenna, a wide angle receiving antenna should be selected. Each semiconductor microwave radiation source is dispersed at each angle of the receiving antenna, the electric small antenna is close to the omnidirectional antenna, the gain pattern is close to each direction, and the phase pattern is close to each direction. To enhance the coherence enhancing effect of the method, the phase pattern of the antenna may be calibrated into the system, if necessary. The phase pattern can be obtained by simulation, test and other methods.
As shown in fig. 2, the 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 that the level of the radiation field signal is adjusted, and then the radiation field signal is transmitted to the receiver, and the radio frequency cable can be used to transmit the signal. 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 delay of the signal from the receiving antenna to the receiver is completely uniform. Thus, the signal of the radiation field signal reaching the receiver is:
Where τ L is the signal delay for the signal passing from the receive antenna to the receiver.
Since the signals generated by the different semiconductor microwave radiation sources are orthogonal waveforms, the target locations may be reached simultaneously in time, and thus the signal waveforms may produce significant envelope fluctuations. To ensure a true recovery of the signal, the instantaneous dynamic range of the receiver needs to be large enough, a 14bit quantization can be used, and the effective dynamic range exceeds 75dB for the receiver. As shown in fig. 3, the receiver of the present embodiment includes 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 filtering and a digital quadrature down-conversion module, which are connected in sequence; its local oscillator and sampling clock requirements are generated by a frequency synthesizer system. And sequentially performing 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 the formula (5):
Wherein, Is the reference phase of the down-conversion local oscillator, which is consistent for all radiated signals since each radiated source is received by the same receive channel. The fixed phase part is:
Thus, formula (7) is expressed as:
Comparing the two signals of (7) using τ m1,τm2 and Describing its time and phase differences:
as shown in fig. 4, the complex baseband signal is processed using a matched receive processing algorithm corresponding to each excitation signal to separate out the radiation signals corresponding to the respective semiconductor microwave radiation sources.
By means of signal processing, the time difference and phase difference caused by the difference of the distance between the radiation source and the target are estimated. The specific calculation method can be as follows:
Wherein, T span is to separate out the corresponding radiation signals of each semiconductor microwave radiation source; PSF (τ) is a point spread function whose energy is concentrated near 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. 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 synthesizer system. The delay and the phase of the excitation signal of the semiconductor microwave radiation source 1 can be unchanged, and the 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). Either individually designed waveforms or rectangular pulse waveforms.
The two signals are propagated through the radio frequency feeder line and the space, and the electromagnetic fields reaching the target position are respectively:
obtained from the formula (13)
From the equation, the amplitude and the phase of the two radiation sources at the target position are consistent, and the coherence enhancement is realized.
The frequency synthesizer is set with delay and phase compensation, each radiation source uses the same baseband waveform, the initial phase and time delay are adjusted to radiate the target position, the phase compensation can be realized on the intermediate frequency signal, and the phase of the local oscillation signal of direct digital up-conversion (DDS) can be controlled. The radiation waveform achieved by the above method may achieve a coherent enhancement of field strength at the target.
The interference enhancement realized by the invention is essentially different from the pattern synthesis of phased arrays 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 as to realize the field intensity enhancement at the target position. Fig. 5 analyzes the influence factor of the size of the enhancement region, where θ is the maximum opening angle of the radiation source centered at the target location. The enhanced area size was 0.22 meters calculated with a center frequency of 8GHz and an opening angle θ of 5 degrees. In order to ensure the uniformity of the radiation field, under the specific frequency condition, a certain constraint is imposed on the opening angle.
Claims (13)
1. A field intensity coherent 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 synthesizer system, N semiconductor microwave radiation sources, a receiving antenna and a receiver which are arranged in any mode; 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 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 waveform of the radiation field 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 synthesizer system and outputting N paths of different excitation signals through a signal output end of the frequency synthesizer system, wherein the N paths of different excitation signals are respectively used as excitation signals of N semiconductor microwave radiation sources;
Step 2.2, each semiconductor microwave radiation source receives respective excitation signals, amplifies the excitation signals and irradiates the excitation signals 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 performs separation processing on the received radiation field signals to obtain radiation signals corresponding to the semiconductor microwave radiation sources;
Step 2.5, calculating the time difference and the phase difference of the radiation signals of the semiconductor microwave radiation sources reaching the target position by comparing the radiation signals corresponding to the semiconductor microwave radiation sources;
the time difference and the phase difference of the radiation signals of each semiconductor microwave radiation source reaching the target position are calculated by adopting the following formula:
Wherein, T span is to separate out the corresponding radiation signals of each semiconductor microwave radiation source; PSF (τ) is a point spread function whose energy is concentrated near τ=0 in the time domain, Q (τ) is the quadrature phase of the complex baseband signal, I (τ) is the in-phase of the complex baseband signal;
And 3, adjusting the delay and the phase of the excitation signals of the semiconductor microwave radiation sources based on the time difference and the phase difference of the radiation signals of the semiconductor microwave radiation sources reaching the target position calculated in the step 2, further adjusting the delay and the phase of the radiation signals of the semiconductor microwave radiation sources, compensating the time difference and the phase difference of the radiation signals of the semiconductor microwave radiation sources reaching the target position, enabling the amplitude and the phase of the radiation signals of the semiconductor microwave radiation sources reaching the target position to be consistent, and realizing the coherent enhancement of the radiation field at the target position.
2. A method of field strength coherent combining a distributed microwave radiation source according to claim 1, wherein: the step 1 intermediate frequency integrated system is provided with N signal output ends, and each signal output end is electrically connected with the signal input ends of the 1 semiconductor microwave radiation sources respectively.
3. A method of field strength coherent combining a distributed microwave radiation source according to claim 2, wherein: in step 1, the signal output end of the frequency synthesis system is connected with the signal input ends of N semiconductor microwave radiation sources arranged in any mode through a radio frequency feeder line, or radio frequency signals are modulated to light intensity change and are connected through optical fibers.
4. A method of field strength coherent combining a distributed microwave radiation source according to any one of claims 1-3, characterized in that: in the step 1, a radio frequency front end is also arranged between the receiving antenna and the receiver; in step 2.3, after the receiving antenna performs induction measurement on the radiation field signal at the target position, the radiation field signal is filtered by the radio frequency front end and then sent to the receiver.
5. A method of field strength coherent combining a distributed microwave radiation source according to 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 method of coherent combination of field strengths of distributed microwave radiation sources 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 method of coherent combination of field strengths of distributed microwave radiation sources according to claim 6, wherein step 2.4 is specifically:
Step 2.41, the receiver amplifies, filters, down-converts, automatically controls the gain, digitally samples and processes the received radiation field signal to obtain a complex baseband signal;
and 2.42, processing the complex baseband signals by utilizing a matching receiving processing algorithm corresponding to each excitation signal, and separating out radiation signals corresponding to the semiconductor microwave radiation sources.
8. A field intensity coherent combining system of a distributed microwave radiation source, characterized in that: the device comprises a frequency synthesizer system, N semiconductor microwave radiation sources, a receiving antenna and a receiver which are arranged in any mode;
the signal output end of the frequency synthesis system is electrically connected with the signal input ends of 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 N semiconductor microwave radiation sources, adjusting the delay and the phase of the excitation signals of each semiconductor microwave radiation source, further adjusting the delay and the phase of the radiation signals of each semiconductor microwave radiation source, compensating the time difference and the phase difference of the radiation signals of each semiconductor microwave radiation source reaching a target position, enabling the amplitude and the phase of the radiation signals of each semiconductor microwave radiation source reaching the target position to be consistent, and realizing the coherent enhancement of a radiation field at the target position;
each semiconductor microwave radiation source receives respective excitation signals, generates radiation signals after amplification, radiates the radiation signals to a target position, and forms radiation field signals at the target position;
the receiving antenna is used for sensing and measuring radiation field signals and transmitting the radiation field signals 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 the time difference and the phase difference of the radiation signals of the semiconductor microwave radiation sources reaching the target position.
9. The field strength coherent combining system of a distributed microwave radiation source of claim 8, wherein: the frequency synthesizer system is provided with N signal output ends, and each signal output end is electrically connected with the signal input ends of the 1 semiconductor microwave radiation sources respectively.
10. A field strength coherent combining system of a distributed microwave radiation source according to claim 9, wherein: the signal output end of the frequency synthesis system is connected with the signal input ends of N semiconductor microwave radiation sources which are arranged in any mode through a radio frequency feeder line, or radio frequency signals are modulated to the light intensity change and are connected through optical fibers.
11. The field strength coherent combining system of a distributed microwave radiation source of claim 10, wherein: a radio frequency front end is also arranged between the receiving antenna and the receiver.
12. The field strength coherent combining system of a distributed microwave radiation source of claim 11, wherein: the receiving antenna is connected with the receiver through a radio frequency cable or an optical fiber.
13. A field strength coherent combining system of a distributed microwave radiation source according to claim 12, 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 connected in sequence;
the variable attenuator is used for carrying out power adjustment on the radiation field signal;
The amplitude limiting low noise amplifier is used for amplifying the radiation field signals processed by the variable attenuator;
the band-pass filter is used for filtering the amplified radiation field signals;
The down-conversion module is used for down-converting the filtered radiation field signals;
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 complex baseband signal.
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