Antenna switching system, method and microwave detection device for cerebral hemorrhage detection

Abstract

The present application discloses an antenna switching system, method and microwave detection equipment for cerebral hemorrhage detection, wherein the method comprises: the present application converts an excitation signal into an optical signal of a specific wavelength and sends it to the input interface of the antenna through an optical fiber transmission line, and uses an optical wavelength switching unit to select a certain antenna of the transceiver array as a transmitting antenna; when the antenna is a transmitting antenna, ensure that only one antenna switch of the antennas other than the transmitting antenna is switched to the output interface, and the switching switches of the other antennas are switched to the input interface. The present application isolates the excitation signal and the receiving signal through optical fiber and cable, so that the transceiver path is separated, thereby simplifying the design of the switch matrix.

Description

Technical Field

[0001] The present application relates to the technical field of biomedical medical equipment, and in particular to an antenna switching system, method and microwave detection equipment for cerebral hemorrhage detection. Background Art

[0002] After a craniotomy due to trauma, tumor, stroke, etc., there is usually a certain danger period, and the patient often needs to be monitored for vital signs in the intensive care unit. However, it is difficult to directly monitor the craniotomy lesion with commonly used monitoring methods. Commonly used brain detection methods include MRI, CT, cerebral angiography, etc., all of which require the patient to be moved and are one-time tests. The detection cost is high and there may even be radiation damage. In addition, the presence of drainage tubes and surgical auxiliary materials makes the detection impossible.

[0003] Due to individual differences among patients, it is difficult to accurately determine the patient's recovery process through indirect bedside test data such as ECG, respiration, and brain waves. Especially for life-threatening situations such as secondary cerebral hemorrhage after surgery, the existing measurement methods are complex and the collection time is long, which delays rescue efforts. Indirect, non-bedside real-time monitoring of the brain recovery process causes patients to stay in the ICU for a long time, resulting in high costs and excessive occupation of priority ICU resources.

[0004] In the experiment, it was found that electromagnetic wave brain imaging equipment, such as products from companies such as Medfield, can use harmless low-frequency microwaves to quickly perform brain imaging. However, the imaging resolution is low and cannot yet support bedside detection of brain diseases. In addition, this type of equipment requires the patient to put his head deep into the device detector, which makes operation difficult when there is a catheter in the patient's brain after surgery. Existing equipment usually requires the antenna to be fixed in a specific carrier and ensure that the antenna position is relatively fixed. The main consideration is in the multi-antenna system. It can be seen that the system's multiple antennas are connected to the microwave transceiver through numerous cables. The cable connection takes up a lot of space. At the same time, the cable cost is very high, which also hinders the placement of other medical devices such as catheters. There is an urgent need for an antenna switching system that can be easily installed and can quickly perform detection. Summary of the invention

[0005] In view of the above situation, the embodiments of the present application propose an antenna switching system, method and microwave detection equipment for cerebral hemorrhage detection to overcome or at least partially overcome the shortcomings of the prior art.

[0006] In a first aspect, the present application discloses an antenna switching system for cerebral hemorrhage detection, comprising:

[0007] An antenna switching unit, comprising a plurality of switching switches for controlling array antennas, each antenna being configured with one switching switch, the switching switch being connected to an input interface and an output interface of each antenna, the input interface being connected to a transmission line, the output interface being connected to an output line, the transmission line being an optical fiber transmission line, and the output line being a cable transmission line;

[0008] The switch switches the antenna to the input interface or the output interface according to the received first external instruction, thereby controlling the antenna to be in a transmitting or receiving state;

[0009] An optical wavelength switching unit is installed in the transmission line and connected to the microwave signal source outlet, and is used to convert the excitation signal generated by the microwave signal source into an optical signal of a specific wavelength according to the second external instruction, and output the specific wavelength signal to the input interface of each antenna through the transmission line and the optical splitter;

[0010] A plurality of photoelectric conversion modules O / E are installed at the input interface of each antenna, each of which receives an optical signal of a preset specific wavelength and converts the fixed wavelength signal into an electrical signal and provides it to the antenna;

[0011] The power synthesizer is connected to the output interface of each antenna and receives the output signal of each antenna.

[0012] In some embodiments, the optical wavelength switching unit includes:

[0013] An electro-optical conversion module E / O is installed on the signal transmission line, and the electro-optical conversion module E / O is connected to the outlet of the microwave signal source, and is used to convert the excitation signal generated by the microwave signal source into an optical signal;

[0014] The optical wavelength switcher is connected to the electro-optical conversion module E / O, and is used to convert the optical signal into an optical signal of a specific wavelength according to the second external instruction received, and output the specific wavelength to the optoelectronic conversion module O / E of each antenna through a splitter, and convert it into an electrical signal that can be received by the antenna through the optoelectronic conversion module O / E.

[0015] In a second aspect, the present application discloses a microwave detection device for cerebral hemorrhage detection, which has the above-mentioned antenna switching system and further includes:

[0016] A microwave signal source generates an excitation signal under the control of a host computer, wherein the excitation signal is a single tone signal emitting different frequencies at different times;

[0017] A wearable device having a transceiver antenna array, each antenna having an input interface for receiving an excitation signal and an output interface for outputting an antenna output signal;

[0018] The data processing unit is connected to the power synthesizer and is used to receive the antenna output signal and further process the output signal.

[0019] In some embodiments, the microwave signal source and the data processing unit are functional modules of a vector network analyzer.

[0020] In some embodiments, the vector network analyzer has a port, the port of the vector network analyzer is connected to a directional coupler, and the excitation signal and the antenna output signal are input into the vector network analyzer through the directional coupler.

[0021] In some embodiments, an error matrix generated by the phase and amplitude of the electro-optical conversion module E / O and the photoelectric conversion module O / E under different signals is obtained.

[0022] In some embodiments, one antenna of the array antenna is used as a transmitting antenna, and the other antennas are used as receiving antennas to receive signals in time. When the switching switch of a certain antenna is switched to the output interface, the output circuit works and the antenna is in the transmitting state. The antenna switching switches of other antennas are switched to the input interface and the other antennas are in the receiving state.

[0023] In some embodiments, one antenna in the array antenna serves as a transmitting antenna, and the other antennas receive the output signal, wherein the output signal is a scattered signal received by different receiving antennas after the excitation signal of the transmitting antenna passes through different positions of the head, and the scattered signal is the acquired physiological dielectric properties of the relative position of the head, and the physiological dielectric properties are obtained by measuring a transmission parameter S, and each of the transmission parameters S contains information of all frequency points.

[0024] In some embodiments, compensating the error matrix using a calibration matrix further includes:

[0025] For each frequency point, the transmission parameter S is calibrated using the error matrix.

[0026] In a third aspect, the present application further discloses an antenna switching method for cerebral hemorrhage detection, which is applied to the above-mentioned antenna switching system, comprising: converting an excitation signal into an optical signal of a specific wavelength and sending it to an input interface of the antenna through an optical fiber transmission line, and selecting a certain antenna of the array antenna as a transmitting antenna by using an optical wavelength switching unit;

[0027] When the antenna is a transmitting antenna, ensure that only one of the antennas other than the transmitting antenna has its switch switched to the output interface, and the switches of the other antennas are switched to the input interface.

[0028] At least one of the above technical solutions adopted in the embodiments of the present application can achieve the following beneficial effects:

[0029] The present application isolates the excitation signal (transmitting signal) and the receiving signal through optical fibers and cables, so that the transmitting and receiving paths are separated, thereby simplifying the design of the switch matrix.

[0030] The present application uses the transmitting circuit of the optoelectronic module for transmission, which can ensure that the antenna signal will not be fed back to the transmitting port during non-transmission, thereby reducing the number of switches.

[0031] The present application only uses the optical fiber conversion solution at the signal transmission end, and still retains the cable receiving line, thereby simplifying the system calibration.

[0032] The present application can perform two-way monitoring simultaneously by adopting an optical wavelength switching unit, thereby improving the acquisition speed.

[0033] The optoelectronic transmission solution of the present application uses a nonlinear transmitting end, which has a much lower cost than using optical components at the receiving end, and can effectively expand the port of the vector network analyzer VNA. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0035] Figure 1 A schematic structural diagram of an antenna switching system for cerebral hemorrhage detection according to an embodiment of the present application is shown.

[0036] Figure 2 A schematic diagram of the existing array antenna switching process.

[0037] Figure 3 A schematic diagram of the process of switching an array antenna according to an embodiment of the present application is shown.

[0038] Figure 4 A schematic structural diagram of a microwave detection device according to an embodiment of the present application is shown.

[0039] Figure 5 A schematic diagram showing transmissions of different antennas passing through different positions of the head according to an embodiment of the present application.

[0040] Figure 6 Schematic diagram of phase and frequency compensation coefficient conversion of the photoelectric conversion module. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be clearly and completely described below in combination with the specific embodiments of the present application and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

[0042] The microwave detection device for cerebral hemorrhage detection of the present application includes a microwave signal source, a transceiver antenna array, an antenna switching system for controlling the transceiver antenna array, and a data processing and analysis unit. The transceiver antenna array is attached to a wearable device, such as a customized headgear. The microwave signal source generates a large number of frequency sweep signals under the control of a host computer and transmits them using an antenna. The data acquisition, processing and analysis system acquires and saves the scattered signals (electric field signals) received by the antenna, and performs inversion imaging on the scattered signals to achieve the purpose of stroke detection and blood clot location.

[0043] Existing detection equipment usually requires the antenna to be fixed in a specific carrier and ensure that the antenna position is relatively fixed. In microwave detection equipment, the transceiver antenna is an antenna array, which is fixed to the patient's head through a wearable device. Each antenna needs to be connected to the microwave signal source and data processing unit through a cable. The numerous cable connections take up a lot of space and hinder the placement of other medical devices such as drainage tubes. In addition, this type of detection equipment requires the patient to put his head deep into the device detector, which makes operation difficult when there is a drainage tube in the patient's brain after surgery.

[0044] like Figure 2 The existing multi-antenna microwave detection equipment uses multiple cable switches to switch between antennas. A typical 8-antenna system requires 2 single-pole 8-throw switches and 8 single-pole double-throw switches to match the dual-port network loss. By switching the switch, it is completed in time sharing, 1 antenna transmits, 2-7 antennas receive; 2 antennas transmit, and the remaining antenna receives (traversing 8 antennas in this way, a total of 56 configurations). The broadband single-port 8-throw antenna is expensive, has large insertion loss, and slow switching speed. Therefore, it hinders cost reduction and measurement speed.

[0045] In the first aspect, the present application provides an antenna switching system for cerebral hemorrhage detection, which realizes the signal separation of antenna excitation and antenna reception through the optoelectronic combination of receiving and transmitting line separation and antenna switching control configuration scheme, and realizes fast antenna switching by replacing the multi-pole switch with the optical wavelength selection / switch optoelectronic module. The antenna switching system of the present application includes: an antenna switching switch unit, an optical wavelength switching unit, multiple optoelectronic conversion modules O / E, and a power synthesizer.

[0046] Reference Figure 1-4The wearable device is an antenna headgear, which is provided with a transceiver antenna array. Each antenna has an input interface for receiving an excitation signal and an output interface for outputting an antenna output signal. The input interface is connected to a transmission line, and the output interface is connected to an output line. The transmission line is an optical fiber transmission line, and the output line is a cable transmission line.

[0047] In this embodiment, the antenna switching switch unit has a plurality of antenna switching switches, each antenna is configured with a switching switch, the switching switch is connected to the input interface and the output interface of each antenna, and the switching switch switches the antenna to the input interface or the output interface according to the received first external instruction, thereby controlling the antenna to be in a transmitting or receiving state;

[0048] In this embodiment, the optical wavelength switching unit is installed in the transmission line and connected to the outlet of the microwave signal source. The optical wavelength switching unit is used to convert the excitation signal generated by the microwave signal source into an optical signal of a specific wavelength according to a second external instruction, and output the specific wavelength signal through the transmission line via a splitter to the input interface of each antenna.

[0049] In this embodiment, a plurality of optoelectronic conversion modules O / E are installed at the input interface of each antenna. Each optoelectronic conversion module O / E receives an optical signal of a preset specific wavelength and converts the specific wavelength signal into an electrical signal to provide to the antenna.

[0050] In this embodiment, the power combiner is connected to the output interface of each antenna to receive the output signal of each antenna.

[0051] In this embodiment, the optical wavelength switching unit includes:

[0052] The electro-optical conversion module E / O (E / O module for short) is installed on the signal transmission line. The E / O module is connected to the outlet of the microwave signal source and is used to convert the excitation signal generated by the microwave signal source into an optical signal.

[0053] The optical wavelength switcher is connected to the electro-optical conversion module E / O, and is used to convert the optical signal into an optical signal of a specific wavelength according to the second external instruction received, and output the specific wavelength to the optoelectronic conversion module O / E of each antenna through a splitter, and convert it into an electrical signal that can be received by the antenna through the optoelectronic conversion module O / E.

[0054] The optical wavelength selection / switch optoelectronic module of the present application replaces the multi-pole switch to achieve fast antenna switching. The optoelectronic conversion module O / E and the electro-optical conversion module E / O achieve the isolation of the transceiver path, so that the transceiver path does not need to be completely opened through the switch route, and the power combiner can be used to replace the 8-pole switch. The power combiner does not need to be switched and can provide a higher signal bandwidth.

[0055] In this embodiment, the power synthesizer is connected to the output interface of each antenna to receive the output signal of each antenna.

[0056] In a second aspect, the present application further discloses a microwave detection device for detecting cerebral hemorrhage, comprising the above-mentioned antenna switching system, and further comprising:

[0057] A microwave signal source generates an excitation signal under the control of a host computer, wherein the excitation signal is a single tone signal emitting different frequencies at different times;

[0058] A wearable device having a transceiver antenna array, each antenna having an input interface for receiving an excitation signal and an output interface for outputting an antenna output signal;

[0059] The data processing unit is connected to the power synthesizer and is used to receive the antenna output signal and further process the output signal.

[0060] In a laboratory scenario, the microwave signal source and the data processing unit are integrated into the vector network analyzer as functional modules of the vector network analyzer.

[0061] The microwave signal source of the vector network analyzer generates an excitation signal, and the directional coupler is used to couple the excitation signal to the transmission line. The directional coupler is also used to receive the antenna output signal. It should be noted that the output line of the antenna is a cable transmission line, and each cable transmission line is simultaneously connected to a power synthesizer, and is transmitted to the directional coupler through the power synthesizer. The antenna switching system of the present application can use a vector network analyzer with one interface, and reducing the number of channels can significantly reduce costs.

[0062] In this embodiment, the directional coupler is connected to the port 1 of the vector network analyzer. Through the directional coupler, the excitation signal transmitted from the port 1 is coupled to the optoelectronic circuit, connected to the antenna through the transmission circuit, and transmitted by the designated antenna through optical wavelength control or powering a single optoelectronic conversion module OE separately. In terms of reception, the antenna switching switch unit switches from the optical module path to the cable path, so that the received signal is introduced into the power synthesizer. The switch connected to the power synthesizer and other paths is not connected, forming an isolation signal block between antennas.

[0063] The present application still needs to realize the configuration of single antenna transmission and the remaining antenna reception, by converting the excitation signal generated by the vector network analyzer into an optical signal of a specific wavelength and sending it to the input interface of the antenna through the optical fiber transmission line, and using the optical wavelength switching unit to select a certain antenna of the antenna head cover as the transmitting antenna. Only when the O / E module receives an optical signal of a specific wavelength, it converts the excitation signal from the optical signal form to the electrical signal form and transmits it to the antenna corresponding to the O / E module. At this time, the antenna acts as a transmitting antenna. The present application only uses the optical fiber conversion solution at the signal sending end, and still retains the cable receiving line, thereby simplifying the system calibration.

[0064] In this embodiment, the wearable device may be an antenna headgear, one of the antennas of the antenna headgear is used as a transmitting antenna, and the other antennas are used as receiving antennas to receive output signals in time division, and when the switching switch of a certain antenna is switched to the output interface, the output circuit works. At this time, the antenna is used as the receiving antenna, and the antenna switching switches of other antennas are switched to the input interface. When the antenna is a transmitting antenna, ensure that only one antenna switching switch of the antennas other than the transmitting antenna is switched to the output interface, and the switching switches of the other antennas are switched to the input interface.

[0065] In this embodiment, the output signal is the scattered signal received by different receiving antennas after the excitation signal of the transmitting antenna passes through different positions of the head. The scattered signal is the acquired physiological dielectric properties of the relative position of the head. The physiological dielectric properties are obtained by measuring the transmission parameters S, and each transmission parameter S contains information of all frequency points.

[0066] In this embodiment, the optical wavelength switching unit is an optical wavelength switcher, and an optical fiber splitter is also provided between the optical wavelength switcher and each optoelectronic conversion module O / E (hereinafter referred to as O / E module). The optical wavelength switcher converts the optical signal into an optical signal of a specified wavelength, and then passes through the optical fiber splitter to connect to the O / E module of each antenna through an optical fiber. In one embodiment of the present application, the antenna headgear has 8 antennas, and the optical signal of the specified wavelength passes through the optical fiber splitter and is connected to the 8 antennas through 8 optical fibers.

[0067] In this application, it is assumed that the antenna headgear has 8 antennas, and the 8 antennas are arranged around the patient's head, namely antenna 1, antenna 2, antenna 3, antenna 4...antenna 8. Antenna 1 is used as a transmitting antenna, and the other antennas 2-8 receive signals in a time-sharing manner. If the switching switch of antenna 2 is switched to the output line, the output line works, and only one antenna receives the signal at each moment. The switching switches of other antennas 3-7 are switched to the non-open O / E module (transmitting line). At this time, the output line of antenna 3-7 is disconnected and does not work. Since the O / E module can only convert optical signals into electrical signals, but cannot convert electrical signals into optical signals, this principle is used to disconnect the transmitting line.

[0068] The present invention proposes a scheme for separating the receiving and transmitting paths and switching control of antennas by combining optoelectronics. The signal separation of antenna excitation and antenna reception is realized by a simple nonlinear optical module. The multi-pole switch is replaced by an optical wavelength selection / switch optoelectronic module to realize fast antenna switching. Only the optical fiber conversion scheme is used at the transmitting end, and the cable receiving line is still retained, thereby simplifying the system calibration.

[0069] The previous solution used multiple 8-pole switches to achieve a fully isolated path structure for the transmit and receive ports, but the 8-pole switches are expensive and slow to switch. The new solution uses photoelectric conversion to achieve isolation of the transmit and receive paths, so there is no need to completely route the transmit and receive paths through switches. A power combiner can be used instead of an 8-pole switch. The power combiner does not require switching and can provide a higher signal bandwidth. The new architecture only requires a single-port vector network analyzer for measurement, which can significantly reduce costs by reducing the number of channels.

[0070] This application isolates the excitation signal (transmitting signal) and the receiving signal through optical fibers and cables, so that the transmitting and receiving paths are separated, thereby simplifying the design of the switch matrix. However, the photoelectric conversion module will introduce signal conversion errors.

[0071] In order to solve the problem that the photoelectric conversion module may introduce signal conversion errors, the present application needs to obtain the error matrix generated by the phase and amplitude of the O / E module and the E / O module under different signals. Using the calibration matrix to compensate the error matrix further includes:

[0072] For each frequency point, the transmission parameter S is calibrated using the error matrix.

[0073] When the antenna is transmitting, the excitation signal is a single-tone signal of different frequencies emitted by the vector network analyzer at different times (for example, 0.5-2GHz, interval 0.1GHz, scanning time 1ms). Ideally, the starting phase and amplitude of the single-tone signal are the same, but in reality, due to the factory differences between single O / E modules and E / O modules, the phase and amplitude change under different signals. This application requires factory calibration of this change to form a photoelectric conversion frequency response calibration matrix, and perform corresponding algorithm compensation in post-processing.

[0074] like Figure 4 , Figure 5 As shown, through the above switch and splitter configuration, the logic control module operates the system to form a configuration in which antenna 1 transmits and the remaining antennas receive. Then antenna 2 transmits and the remaining antennas receive... until the traversal of the eight antennas is completed. Figure 5In the case of single antenna transmission, through the spatial configuration of the antenna, the transmission of different antennas passes through different positions of the head, and the physiological dielectric properties of the relative positions of the head are characterized by the transmission parameter S. For example, S31 is the frequency point S parameter matrix when 1 antenna transmits to 3 antennas. Each transmission parameter contains information of all frequency points (0.5-2GHz), so there is an S parameter matrix at each frequency point. The transmission parameter characterization S is expressed as follows:

[0075] like Figure 6 The figure shows the conversion diagram of the phase and frequency compensation coefficients of the photoelectric conversion module. At each frequency point, the transmission line of a single antenna has the phase and frequency compensation coefficients of the photoelectric conversion, which needs to be calibrated through the photoelectric conversion frequency calibration data to form the actual test results. Then, the imaging inversion algorithm is performed with reference to the difference in dielectric constants between human brain tissue and blood, and finally a diagnostic image is formed.

[0076] This application uses photoelectric transmission to ensure that the signal will not be fed back to the transmission port during non-transmission, thereby reducing the number of switches. Simultaneous two-way monitoring improves the acquisition speed. The photoelectric transmission solution uses a nonlinear transmitting end, which is much less expensive than using optical components at the receiving end, and can effectively expand the port of VNA (vector network analyzer).

[0077] In a third aspect, the present application also provides an antenna switching method for cerebral hemorrhage detection, which is applied to the antenna switching system described above, and the method includes converting an excitation signal into an optical signal of a specific wavelength and sending it to an input interface of the antenna through an optical fiber transmission line, and using an optical wavelength switching unit to select an antenna of the antenna headgear as a transmitting antenna;

[0078] When the antenna is a transmitting antenna, ensure that only one of the antennas other than the transmitting antenna has its switch switched to the output interface, and the switches of the other antennas are switched to the input interface.

[0079] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems or computer program products. Therefore, the present application may take the form of a complete hardware embodiment, a complete software embodiment or an embodiment combining software and hardware. Moreover, the present application may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

[0080] The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. An antenna switching system for cerebral hemorrhage detection, characterized in that: include: An antenna switching unit, comprising a plurality of switching switches for controlling array antennas, each antenna being configured with one switching switch, the switching switch being connected to an input interface and an output interface of each antenna, the input interface being connected to a transmission line, the output interface being connected to an output line, the transmission line being an optical fiber transmission line, and the output line being a cable transmission line; The switch switches the antenna to the input interface or the output interface according to the received first external instruction, thereby controlling the antenna to be in a transmitting or receiving state; The optical wavelength switching unit is installed in the transmission line and connected to the microwave signal source outlet. The optical wavelength switching unit is used to convert the excitation signal generated by the microwave signal source into an optical signal of a specific wavelength according to the second external instruction, and output the specific wavelength signal to the input interface of each antenna through the transmission line and the optical splitter; the optical wavelength switching unit is used to select a certain antenna of the array antenna as the transmitting antenna, and the other antennas are used as receiving antennas to receive the output signal in time sharing; Multiple photoelectric conversion modules O / E are installed at the input interface of each antenna. Each photoelectric conversion module O / E receives a light signal of a preset specific wavelength and converts the fixed wavelength signal into an electrical signal and provides it to the antenna. When the photoelectric conversion module O / E receives the light signal of the specific wavelength, it converts the excitation signal from the optical signal form into the electrical signal form and transmits it to the antenna corresponding to the photoelectric conversion module O / E. At this time, the antenna serves as a transmitting antenna. When the antenna is a transmitting antenna, only one of the antenna switches other than the transmitting antenna is switched to the output interface, and the switches of the other antennas are switched to the input interface; The power synthesizer is connected to the output interface of each antenna and receives the output signal of each antenna.

2. The antenna switching system for cerebral hemorrhage detection according to claim 1, characterized in that: The optical wavelength switching unit comprises: An electro-optical conversion module E / O is installed on the signal transmission line, and the electro-optical conversion module E / O is connected to the outlet of the microwave signal source, and is used to convert the excitation signal generated by the microwave signal source into an optical signal; The optical wavelength switcher is connected to the electro-optical conversion module E / O, and is used to convert the optical signal into an optical signal of a specific wavelength according to the second external instruction received, and output the specific wavelength to the optoelectronic conversion module O / E of each antenna through a splitter, and convert it into an electrical signal that can be received by the antenna through the optoelectronic conversion module O / E.

3. A microwave detection device for cerebral hemorrhage detection, characterized in that: The antenna switching system according to claim 2 further comprises: A microwave signal source generates an excitation signal under the control of a host computer, wherein the excitation signal is a single tone signal emitting different frequencies at different times; A wearable device having a transceiver antenna array, each antenna having an input interface for receiving an excitation signal and an output interface for outputting an antenna output signal; The data processing unit is connected to the power synthesizer and is used to receive the antenna output signal and further process the output signal.

4. The microwave detection device for cerebral hemorrhage detection according to claim 3, characterized in that: The microwave signal source and the data processing unit are functional modules of a vector network analyzer.

5. The microwave detection device for cerebral hemorrhage detection according to claim 4, characterized in that: The vector network analyzer has a port, the port of the vector network analyzer is connected to a directional coupler, and the excitation signal and the antenna output signal are input into the vector network analyzer through the directional coupler.

6. The microwave detection device for cerebral hemorrhage detection according to claim 3, characterized in that: Obtain the error matrix generated by the phase and amplitude of the electro-optical conversion module E / O and the photoelectric conversion module O / E under different signals.

7. The microwave detection device for cerebral hemorrhage detection according to claim 6, characterized in that: One antenna of the array antenna is used as a transmitting antenna, and the other antennas are used as receiving antennas to receive signals in time. When the switching switch of a certain antenna is switched to the output interface, the output circuit works and the antenna is in the transmitting state. The antenna switching switches of other antennas are switched to the input interface and the other antennas are in the receiving state.

8. The microwave detection device for cerebral hemorrhage detection according to claim 7, characterized in that: One antenna in the array antenna serves as a transmitting antenna, and the other antennas receive the output signal, which is a scattered signal received by different receiving antennas after the excitation signal of the transmitting antenna passes through different positions of the head. The scattered signal is the acquired physiological dielectric properties of the relative position of the head, and the physiological dielectric properties are obtained by measuring the transmission parameters S, and each of the transmission parameters S contains information of all frequency points.

9. The microwave detection device for cerebral hemorrhage detection according to claim 8, characterized in that: Using a calibration matrix to compensate the error matrix further includes: For each frequency point, the transmission parameter S is calibrated using the error matrix.

10. An antenna switching method for cerebral hemorrhage detection, applied to the antenna switching system according to any one of claims 1-2, characterized in that: The excitation signal is converted into an optical signal of a specific wavelength and sent to the input interface of the antenna through an optical fiber transmission line, and an optical wavelength switching unit is used to select a certain antenna of the array antenna as a transmitting antenna; When the antenna is a transmitting antenna, ensure that only one of the antennas other than the transmitting antenna has its switch switched to the output interface, and the switches of the other antennas are switched to the input interface.

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