Indoor half-space radio spectrum monitoring system and method

Abstract

The present invention relates to an indoor half-space radio spectrum monitoring system and method. The system includes: a control unit, a preprocessing unit, a spectrum receiving unit, a built-in planar antenna, a radome, a shielding casing, an installation unit and a power supply unit. The control unit is wirelessly connected to the preprocessing unit and the spectrum receiving unit; the preprocessing unit, the spectrum receiving unit and the power supply unit are connected; the spectrum receiving unit, the preprocessing unit and the power supply unit are arranged in the inner cavity of the shielding casing; the radome is arranged on one side of the shielding casing; the built-in planar antenna is arranged between the shielding casing and the radome, located in the wrapped cavity of the radome, and connected to the preprocessing unit; the installation unit is arranged on the shielding casing. It can meet the application requirements of indoor radio monitoring, provide stable half-space coverage, and realize the reception protection of strong signals at the same time.

Description

Technical Field

[0001] The present invention relates to the technical field of indoor radio monitoring, and in particular to an indoor half-space radio spectrum monitoring system and method. Background Art

[0002] Radio monitoring is used to monitor and record the spectrum information of spatial radio signals in the measured area, check whether there are abnormal signals or illegal signals, and provide data support for abnormality investigation and illegal signal search. With the widespread application of mobile communications, wireless LAN, wireless Internet of Things and wireless unmanned products in indoor scenes, radio frequencies in buildings are becoming more and more abundant, and the demand for radio frequency monitoring in indoor spaces is becoming more and more urgent. Traditional radio monitoring systems mainly include three types of systems: large station systems, mobile portable systems, and small fixed detection units. They are still insufficient in meeting the needs of radio frequency monitoring in indoor spaces.

[0003] Large-scale station-type systems are composed of multiple devices and are comprehensive in functions, but they have a complex structure and occupy a large space, making them unsuitable for applications in limited spaces within buildings. Mobile systems are available in airborne, shipborne, vehicle-mounted, and handheld portable forms, and are mainly used for short-term monitoring and interference directional search. Testers are required to participate in the test, and they are not suitable for indoor radio monitoring needs. Traditional small fixed monitoring units are mainly targeted at outdoor applications, integrating antennas, receivers, RF switches, solar power supplies, etc. For example, patent CN205105223U discloses an integrated radio monitoring and direction-finding device, specifically disclosing a top-mounted outdoor integrated radio monitoring unit; patent CN206490677U discloses a spectrum monitoring device, specifically disclosing a ground-mounted field integrated radio monitoring unit; patent CN209913825U discloses a highly integrated radio spectrum monitoring device, specifically disclosing an integrated radio monitoring unit for marine applications. Summary of the invention

[0004] In order to overcome the deficiencies of the above-mentioned prior art, the object of the present invention is to provide an indoor half-space radio spectrum monitoring system and method, which can meet the application needs of indoor radio monitoring, facilitate indoor installation in buildings, provide stable half-space coverage, and realize strong signal reception protection.

[0005] In order to achieve the above-mentioned object of the invention, the technical solution of the present invention is:

[0006] The present invention provides an indoor half-space radio spectrum monitoring system, comprising: a control unit, a preprocessing unit, a spectrum receiving unit, a built-in planar antenna, a radome, a shielding housing, a mounting unit and a power supply unit.

[0007] The control unit is wirelessly connected to the pre-processing unit and the spectrum receiving unit;

[0008] The preprocessing unit, the spectrum receiving unit and the power supply unit are connected;

[0009] The spectrum receiving unit, the pre-processing unit and the power supply unit are arranged in the inner cavity of the shielding housing;

[0010] The radome is arranged on one side of the shielding housing;

[0011] The built-in planar antenna is arranged between the shielding housing and the radome, is located in the wrapped cavity of the radome, and is connected to the pre-processing unit;

[0012] The mounting unit is disposed on the shielding housing.

[0013] According to one aspect of the present invention, the spectrum receiving unit adopts a dual-channel mode consisting of a channel 1 and a channel 2, and the two channels work in parallel.

[0014] According to one aspect of the present invention, the plane of the built-in planar antenna is parallel to the plane of the shielding housing, the back lobe points to the shielding housing, and the main lobe points to the antenna cover;

[0015] The built-in planar antenna adopts a single-layer printed circuit board antenna in the form of a half-space planar spiral antenna. The antenna balun and antenna connector part enter the inner cavity of the shielding shell through a shielding tube. The built-in planar antenna uses the shielding shell as a reflection surface to form a half-space receiving coverage.

[0016] According to one aspect of the present invention, one built-in planar antenna is provided, and the half space receives signals covering 200 MHz to 5 GHz.

[0017] According to one aspect of the present invention, the connection between the preprocessing unit, the spectrum receiving unit and the built-in planar antenna is a radio frequency fixed connection, and there is no wired radio frequency signal interface outside the shielding housing and the antenna cover.

[0018] According to one aspect of the present invention, the antenna cover is made of acrylic material.

[0019] According to one aspect of the present invention, the installation unit comprises: a wall-mounted installation unit and a vertical installation unit.

[0020] The wall-mounted mounting unit is disposed on the other side of the shielding housing opposite to the mounting surface of the radome;

[0021] The vertical mounting unit is arranged at the bottom of the shielding housing.

[0022] According to one aspect of the present invention, the preprocessing unit includes a filtering module, an amplification module and an attenuation module.

[0023] The filtering module is a 200MHz to 5GHz bandpass filter realized by connecting a 200MHz high-pass filter and a 5GHz low-pass filter in series;

[0024] The amplification module uses a 200MHz to 5GHz, 30dB low noise amplifier with a maximum input amplitude of -40dBm;

[0025] The attenuation module adopts a 40dB step 5dB adjustable attenuator with a maximum input amplitude of 35dBm;

[0026] The amplification module and the attenuation module are controlled by a control unit.

[0027] The present invention also provides an indoor half-space radio spectrum monitoring method implemented by using the indoor half-space radio spectrum monitoring system, comprising:

[0028] a. Install the system at the measured area, with one side of the antenna cover pointing to the measured area, and connect the power supply unit to a 220V power supply via a 220V two-phase power line;

[0029] b. Set the working mode, select the required monitoring frequency band within the frequency range of 200MHz to 5GHz, and set the alarm threshold S TH =-10dBm;

[0030] c. Start scanning, then the control unit first sets the attenuation of the pre-processing unit to -40dB and the amplification to 0dB, and the channel 1 scans the 200MHz~5GHz spectrum to determine the maximum signal strength S MAX ;

[0031] d. The data obtained from each scan is stored in the database of the control unit. When the storage space is insufficient, the latest record will automatically overwrite the earliest stored record. The control unit will form a spectrum data report according to the user's instructions.

[0032] According to another aspect of the present invention, step c further comprises:

[0033] When S MAX When the attenuation of the pre-processing unit is greater than 30dBm, the attenuation is set to -40dB, the amplification is 0dB, the alarm prompt signal of the system exceeds the receiving range, the channel 1 enters the cycle detection, and the channel 2 stops working;

[0034] When S MAX≤30dBm, the control unit controls the preprocessing unit to set the attenuation and amplification values ​​to ensure that the signal amplitude at the entrance of the spectrum receiving unit is within the range of -60dBm to +5dBm, and the channel 2 starts scanning at the starting point f L To the scanning end point f H The scan starts from the scan starting point f L To the scanning end point f H After scanning once, the control unit records the scanning starting point f obtained by monitoring the channel 2. L To the scanning end point f H The spatial signal spectrum information, and then continue to scan f L to f H spectrum until the user issues a stop command;

[0035] While channel 2 is scanning, channel 1 is continuously monitoring the maximum signal strength S of 200MHz to 5GHz. MAX The control unit always calculates the maximum signal strength S MAX Feedback is performed and the preprocessing unit is controlled to set the attenuation and amplification values ​​to ensure that the signal amplitude at the entrance of the spectrum receiving unit is within the range of -60dBm to +5dBm for safe reception.

[0036] Beneficial effects:

[0037] According to the solution of the present invention, through the design of the control unit, the dual-channel spectrum receiving unit and the preprocessing unit, it is possible to monitor the maximum amplitude of the full-band received signal and feedback protection control while performing designated frequency radio spectrum monitoring, and to attenuate and amplify the signal according to the signal strength, thereby solving the problem of spectrum receiving system protection under strong signal conditions in indoor applications.

[0038] The built-in planar antenna uses the shielded casing as the reflective surface to form semi-space reception coverage, which makes up for the defects of traditional outdoor unit omnidirectional or directional antennas in indoor applications, meets the indoor semi-space coverage requirements of buildings, and reduces the impact of the wall on the system antenna reception after the system is installed on the wall of the building.

[0039] The wall-mounted installation unit and the vertical installation unit support installation on the indoor side walls, ceilings, and floors of buildings, solving the shortcomings of the traditional ceiling-mounted and pole-mounted radio monitoring system in indoor applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 A schematic diagram schematically showing the composition of an indoor half-space radio spectrum monitoring system according to an embodiment of the present invention;

[0041] Figure 2A schematic diagram schematically showing a wall installation diagram of an indoor half-space radio spectrum monitoring system according to an embodiment of the present invention;

[0042] Figure 3 A schematic diagram schematically showing a ceiling installation diagram of an indoor half-space radio spectrum monitoring system according to an embodiment of the present invention;

[0043] Figure 4 A schematic diagram schematically showing a ground installation diagram of an indoor half-space radio spectrum monitoring system according to an embodiment of the present invention;

[0044] Figure 5 A flow chart schematically showing an indoor half-space radio spectrum monitoring method according to an embodiment of the present invention;

[0045] Figure 6 A schematic diagram schematically illustrates a specific process of an indoor half-space radio spectrum monitoring method according to an embodiment of the present invention.

[0046] Description of reference numerals:

[0047] Label Modules S101 Control unit S102 Built-in planar antenna S103 Radome S104 Shielded housing S105 Wall Mount Unit S106 Spectrum receiving unit S107 Preprocessing unit S108 Vertical mounting unit S109 Power supply unit B101 220V power supply B102 wall B103 ceiling B104 Tripod DETAILED DESCRIPTION

[0048] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0049] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments cannot be described one by one here, but the embodiments of the present invention are not therefore limited to the following embodiments.

[0050] like Figure 1As shown, the indoor half-space radio spectrum monitoring system of this embodiment includes: a control unit S101, a preprocessing unit S107, a spectrum receiving unit S106, a built-in planar antenna S102, a radome S103, a shielding housing S104, an installation unit and a power supply unit S109. The control unit S101 is wirelessly connected to the preprocessing unit S107 and the spectrum receiving unit S106, and is used to control the preprocessing unit S107 and the spectrum receiving unit S106 to work, read and record the spectrum information of the space radio signal output by the spectrum receiving unit S106, and process and generate an electromagnetic spectrum report. The preprocessing unit S107, the spectrum receiving unit S106 and the power supply unit S109 are connected to each other, and the preprocessing unit S107 is used to receive the space radio signal output by the built-in planar antenna S102, filter out the signal outside the receiving band, and amplify and attenuate the filtered signal under the control of the control unit S101. The spectrum receiving unit S106 is used to receive the space radio signal processed by the preprocessing unit S107, output the spectrum information of the space radio signal and transmit it to the control unit S101. The spectrum receiving unit S106, the preprocessing unit S107 and the power supply unit S109 are arranged in the inner cavity of the shielding housing S104; the antenna cover S103 is arranged on one side of the shielding housing S104; the built-in planar antenna S102 is arranged between the shielding housing S104 and the antenna cover S103, located in the wrapped cavity of the antenna cover S103, and connected to the preprocessing unit S107; the mounting unit is arranged on the shielding housing S104.

[0051] The control unit S101 is implemented by the host computer, and is remotely connected to the spectrum receiving unit S106 and the preprocessing unit S107 through a shielded network cable to control their operation, read the spatial radio signal spectrum information output by them, and process and generate an electromagnetic spectrum report. In the report, the indoor environment electromagnetic spectrum is displayed by selecting a spectrum curve at a certain moment in the monitoring record and a spectrum waterfall diagram for a time period. The preprocessing unit S107 is controlled to attenuate or amplify according to the signal amplitude.

[0052] The built-in planar antenna S102 is installed outside the shielding case S104 and protected by the radome S103. The plane of the built-in planar antenna S102 is parallel to the plane of the shielding case S104. The back lobe of the built-in planar antenna S102 points to the shielding case S104, and the main lobe points to the radome S103. The built-in planar antenna S102 adopts a half-space Archimedean planar spiral antenna. The antenna balun feed is located at the center of the spiral circle, and the antenna connector is in the form of SMA (F). The antenna balun and the antenna connector part enter the inside of the shielding case S104 through the shielding tube to reduce the height of the entire system. The built-in planar antenna S102 is a single-layer printed circuit board antenna, and the shielding case S104 is used as the reflection surface to form a half-space receiving coverage. The number of built-in planar antennas S102 is 1, and the formed half-space receiving covers the 200MHz~5GHz frequency band signal, avoiding antenna switching and simplifying the system structure and operation. The combination of the built-in planar antenna S102 and the shielding case S104 reduces the structural size and reduces the impact of the wall on the antenna.

[0053] The radome S103 is made of acrylic material and is installed on the shielding case S104 to protect the built-in planar antenna S102 from being damaged by the external environment. The plane of the radome S103 is parallel to the plane of the shielding case S104.

[0054] The outer layer of the shielding case S104 is made of acrylic material to reduce weight, and the inner layer is shielded with conductive copper foil. The shielding case S104 is used to provide installation support for the built-in planar antenna S102, the antenna cover S103, the wall-mounted installation unit S105, the spectrum receiving unit S106, the pre-processing unit S107, the vertical installation unit S108 and the power supply unit S109, shield the electromagnetic signals of the spectrum receiving unit S106, the pre-processing unit S107 and the power supply unit S109 to avoid contamination of the radio frequency spectrum in the measured area, and serve as an extended reflection surface of the built-in planar antenna S102 to keep the antenna pointing stably.

[0055] The installation unit includes a wall-mounted installation unit S105 and a vertical installation unit S108. Correspondingly, if a wall-mounted installation method is adopted, the system can be installed on a wall B102 or a ceiling B103 through the wall-mounted installation unit S105. Figure 2 or Figure 3 If a vertical installation method is adopted, the system can be set on the ground through the vertical installation unit S108, such as Figure 4 shown.

[0056] The wall-mounted installation unit S105 is provided on the other side of the shielding case S104 opposite to the installation surface of the antenna cover S103, and a plurality of two-stage movable hanging rings are provided near the outer surface of the shielding case S104. According to the first embodiment of the present invention, when wall-mounted, expansion screws are installed on the wall of the building in the area to be monitored, and the system is hung on the expansion screws through two movable hanging rings to achieve the wall-mounted installation of the system on the surface of the building, such as Figure 2 According to the second embodiment of the present invention, when installing on the building ceiling B103, the system is installed on the building ceiling B103 by hanging the system on the hooks of the ceiling B103 through four movable hanging rings, as shown in FIG. Figure 3 According to the third embodiment of the present invention, the vertical installation unit S108 is arranged at the bottom of the shielding housing S104 for vertical installation of the system, and can be connected to a tripod B104 to realize indoor floor-standing arrangement, such as Figure 4 shown.

[0057] The spectrum receiving unit S106 is implemented through a general software radio platform, covering 30MHz to 6GHz, and receiving signals with a dynamic range of -70dBm to +10dBm. The spectrum receiving unit S106 uses a dual-channel mode consisting of channel 1 and channel 2 to receive signals, and the two channels work in parallel. Channel 1 and channel 2 both receive spatial radio signals processed by the preprocessing unit S107. Channel 1 continuously monitors the maximum amplitude of the received signal within the full frequency band of 200MHz to 5GHz, providing a basis for the control unit S101 to control the preprocessing unit S107 to adjust the amplitude, and serving as a reference for signal attenuation and amplification. Channel 1 uses RBW1MHz, and quickly scans 10001 points within 200MHz to 5GHz to obtain the maximum strength of the received signal. Channel 2 is responsible for monitoring and scanning the spectrum in the specified frequency range, and outputting the required spectrum monitoring information. The control unit S101 controls the preprocessing unit S107 to attenuate and amplify the received signal according to the maximum amplitude of the received signal, and controls the RF signal input by the spectrum receiving unit S106 to be within a safe range, ensuring the safety of the spectrum receiving unit S106. The spectrum receiving unit S106 transmits the spectrum information of the spatial radio signals obtained by the two channels to the control unit S101.

[0058] The preprocessing unit S107 includes a filtering module, an amplifying module and an attenuating module. Among them, the filtering module is a 200MHz-5GHz bandpass filter realized by connecting a 200MHz high-pass filter and a 5GHz low-pass filter in series, the amplifying module is realized by a 200MHz-5GHz, 30dB low-noise amplifier with a maximum input amplitude of -40dBm, and the attenuating module is realized by a 40dB step 5dB adjustable attenuator with a maximum input amplitude of 35dBm. The amplifying module and the attenuating module work under the control of the control unit S101. After the signal enters the preprocessing unit S107, it first passes through the filtering module, then the attenuating module, and finally the amplifying module, and then the signal is transmitted to the spectrum receiving unit S106. According to the data of channel 1 of the spectrum receiving unit S106, when the input signal amplitude of the amplifying module of the preprocessing unit S107 is at risk of exceeding -40dBm, the control unit S101 controls the preprocessing unit S107 to increase the attenuation or shut down the amplifying module to ensure the safety of the amplifying module.

[0059] Under the control of the control unit S101, the preprocessing unit S107 and the spectrum receiving unit S106 work together to achieve signal acquisition in the normal working range of -90dBm to +30dBm, and the maximum signal power tolerance is +35dBm. The control unit S101 controls the preprocessing unit S107 to amplify or attenuate according to the maximum amplitude of the received signal obtained by channel 1 of the spectrum receiving unit S106, attenuates large signals, and amplifies small signals, ensuring that the signal strength at the entrance of the 200MHz to 5GHz spectrum receiving unit S106 is less than +5dBm, protecting the system from damage by signals within +35dBm, and avoiding damage to the system by strong indoor signals. At the same time, the signal strength at the entrance of the spectrum receiving unit S106 within the receiving range is guaranteed to be within the range of -60dBm to +5dBm, ensuring the normal operation of the spectrum receiving unit S106.

[0060] The power supply module S109 is connected to the external 220V power supply B101 through a 220V two-phase power line, and supplies power to the spectrum receiving unit S106 and the pre-processing unit S107 after voltage conversion.

[0061] The connection between the built-in planar antenna S102, the preprocessing unit S107 and the spectrum receiving unit S106 of the entire system is a fixed RF connection, which is located in the package space of the shielding shell S104 and the antenna cover S103. There is no wired RF signal interface outside the shielding shell S104 and the antenna cover S103.

[0062] like Figure 5 and Figure 6 As shown, the following further explains the operation of the indoor half-space radio spectrum monitoring system and the protection of the spectrum receiving unit signal in combination with the monitoring example process.

[0063] The first step (step a): install the system at the measured area, with one side of the antenna cover pointing to the measured area, the power supply unit is connected to the 220V power supply through a 220V two-phase power line, and is remotely connected to the control unit through a shielded network cable.

[0064] Step 2 (step b): Set the working mode and select the required monitoring frequency band within the range of 200MHz to 5GHz. In this example, the scanning starting point f is selected. L is 200MHz, the scanning end point f H 5GHz. Set the alarm threshold S TH The alarm threshold is -10dBm. When the scan signal exceeds the threshold, an alarm is triggered and recorded in the abnormal log.

[0065] Step 3 (Step c): Start scanning, then the control unit first sets the pre-processing unit attenuation to -40dB, the amplification to 0dB, channel 1 scans the 200MHz~5GHz spectrum, and confirms the maximum signal strength S MAX .

[0066] When S MAX When the attenuation of the pre-processing unit is greater than 30dBm, the attenuation is set to -40dB and the amplification is set to 0dB. The system alarm prompts that the signal exceeds the receiving range, channel 1 enters the cycle detection, and channel 2 stops working.

[0067] When S MAX ≤30dBm, the control unit controls the pre-processing unit to set the attenuation and amplification values ​​to ensure that the signal amplitude at the entrance of the spectrum receiving unit S106 is within the range of -60dBm to +5dBm, and channel 2 starts scanning starting point f L To the scanning end point f H After each scan, f L to f H After that, the control unit records the f obtained by channel 2. L to f H The spatial signal spectrum information, and then continue to scan f L to f H The spectrum is scanned until the user issues a stop command. While channel 2 is scanning, channel 1 keeps monitoring the maximum signal strength S from 200MHz to 5GHz. MAX , the control unit S101 has been based on S MAX The feedback control preprocessing unit sets the attenuation and amplification values ​​to ensure that the signal amplitude at the entrance of the spectrum receiving unit is within the range of -60dBm to +5dBm for safe reception.

[0068] Step 4 (Step d): The data obtained from each scan is stored in the database of the control unit. When the storage space is insufficient, the system automatically overwrites the earliest stored record with the latest record. The control unit generates a spectrum data report according to the user's instructions.

[0069] The above is only one embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An indoor half-space radio spectrum monitoring system, characterized in that: include: A control unit (S101), a pre-processing unit (S107), a spectrum receiving unit (S106), a built-in planar antenna (S102), a radome (S103), a shielding housing (S104), a mounting unit and a power supply unit (S109), The control unit (S101) is wirelessly connected to the pre-processing unit (S107) and the spectrum receiving unit (S106); The pre-processing unit (S107), the spectrum receiving unit (S106) and the power supply unit (S109) are connected; The spectrum receiving unit (S106), the pre-processing unit (S107) and the power supply unit (S109) are arranged in the inner cavity of the shielding housing (S104); The antenna cover (S103) is arranged on one side of the shielding housing (S104); The built-in planar antenna (S102) is arranged between the shielding housing (S104) and the antenna cover (S103), is located in the wrapped cavity of the antenna cover (S103), and is connected to the pre-processing unit (S107); The mounting unit is arranged on the shielding housing (S104); The spectrum receiving unit (S106) adopts a dual-channel mode consisting of channel 1 and channel 2, and the two channels work in parallel; both the channel 1 and the channel 2 receive the spatial radio signal processed by the pre-processing unit (S107); The channel 1 continuously monitors the maximum amplitude of the received signal in the full frequency band, providing a basis for the control unit (S101) to control the pre-processing unit (S107) to adjust the amplitude, and serving as a reference for signal attenuation and amplification; The channel 2 is responsible for monitoring and scanning the spectrum within the specified frequency range and outputting the required spectrum monitoring information.

2. The indoor half-space radio spectrum monitoring system according to claim 1, characterized in that: The plane of the built-in planar antenna (S102) is parallel to the plane of the shielding shell (S104), the back lobe points to the shielding shell (S104), and the main lobe points to the antenna cover (S103); The built-in planar antenna (S102) is a single-layer printed circuit antenna in the form of a half-space planar spiral antenna. The antenna balun and antenna connector part enter the inner cavity of the shielding casing (S104) through a shielding tube. The built-in planar antenna (S102) uses the shielding casing (S104) as a reflection surface to form a half-space receiving coverage.

3. The indoor half-space radio spectrum monitoring system according to claim 2, characterized in that: One built-in planar antenna (S102) is provided, and the half space receives signals covering 200MHz to 5GHz.

4. The indoor half-space radio spectrum monitoring system according to claim 1, characterized in that: The connection between the preprocessing unit (S107), the spectrum receiving unit (S106) and the built-in planar antenna (S102) is a radio frequency fixed connection, and there is no wired radio frequency signal interface outside the shielding housing (S104) and the antenna cover (S103).

5. The indoor half-space radio spectrum monitoring system according to claim 1, characterized in that: The antenna cover (S103) is made of acrylic material.

6. The indoor half-space radio spectrum monitoring system according to claim 1, characterized in that: The installation unit comprises: a wall-mounted installation unit (S105) and a vertical installation unit (S108), The wall-mounted installation unit (S105) is arranged on the other side of the shielding housing (S104) opposite to the installation surface of the antenna cover (S103); The vertical installation unit (S108) is arranged at the bottom of the shielding shell (S104).

7. The indoor half-space radio spectrum monitoring system according to claim 1, characterized in that: The pre-processing unit (S107) includes a filtering module, an amplification module and an attenuation module. The filtering module is a 200MHz to 5GHz bandpass filter realized by connecting a 200MHz high-pass filter and a 5GHz low-pass filter in series; The amplification module uses a 200MHz to 5GHz, 30dB low noise amplifier with a maximum input amplitude of -40dBm; The attenuation module adopts a 40dB step 5dB adjustable attenuator with a maximum input amplitude of 35dBm; The amplification module and the attenuation module are controlled by a control unit (S101).

8. An indoor half-space radio spectrum monitoring method implemented by using the indoor half-space radio spectrum monitoring system according to any one of claims 1 to 7, comprising: a. Install the system at the measured area, with one side of the antenna cover pointing to the measured area, and connect the power supply unit to a 220V power supply via a 220V two-phase power line; b. Set the working mode, select the required monitoring frequency band within the frequency range of 200MHz to 5GHz, and set the alarm threshold S TH =-10dBm; c. Start scanning, then the control unit first sets the attenuation of the pre-processing unit to -40dB and the amplification to 0dB, and the channel 1 scans the 200MHz~5GHz spectrum to determine the maximum signal strength S MAX ; d. The data obtained from each scan is stored in the database of the control unit. When the storage space is insufficient, the latest record will automatically overwrite the earliest stored record. The control unit will form a spectrum data report according to the user's instructions.

9. The indoor half-space radio spectrum monitoring method according to claim 8, characterized in that: The step c also includes: When S MAX When the attenuation of the pre-processing unit is greater than 30dBm, the attenuation is set to -40dB, the amplification is 0dB, the alarm prompt signal of the system exceeds the receiving range, the channel 1 enters the cycle detection, and the channel 2 stops working; When S MAX ≤30dBm, the control unit controls the preprocessing unit to set the attenuation and amplification values ​​to ensure that the signal amplitude at the entrance of the spectrum receiving unit is within the range of -60dBm to +5dBm, and the channel 2 starts scanning at the starting point f L To the scanning end point f H The scan starts from the scan starting point f L To the scanning end point f H After scanning once, the control unit records the scanning starting point f obtained by monitoring the channel 2. L To the scanning end point f H The spatial signal spectrum information, and then continue to scan f L to f H spectrum until the user issues a stop command; While channel 2 is scanning, channel 1 is continuously monitoring the maximum signal strength S of 200MHz to 5GHz. MAX The control unit always calculates the maximum signal strength S MAX Feedback is performed and the preprocessing unit is controlled to set the attenuation and amplification values ​​to ensure that the signal amplitude at the entrance of the spectrum receiving unit is within the range of -60dBm to +5dBm for safe reception.

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