CN113252997B - Control method of frequency-selecting type electromagnetic radiation monitor - Google Patents
Control method of frequency-selecting type electromagnetic radiation monitor Download PDFInfo
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- CN113252997B CN113252997B CN202110716369.2A CN202110716369A CN113252997B CN 113252997 B CN113252997 B CN 113252997B CN 202110716369 A CN202110716369 A CN 202110716369A CN 113252997 B CN113252997 B CN 113252997B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/08—Measuring electromagnetic field characteristics
- G01R29/0864—Measuring electromagnetic field characteristics characterised by constructional or functional features
- G01R29/0892—Details related to signal analysis or treatment; presenting results, e.g. displays; measuring specific signal features other than field strength, e.g. polarisation, field modes, phase, envelope, maximum value
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- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
Abstract
The invention discloses a control method of a frequency-selecting type electromagnetic radiation monitor, and relates to the technical field of electromagnetic radiation detection. The method comprises a range selection step and a bottom noise deduction step, wherein in the range selection step, a main controller regularly acquires electromagnetic radiation signals, calculates the maximum intensity of the current signals, compares the maximum intensity with the end value of the range of the current range gear, and performs the operations of gear up-shifting, gear down-shifting judgment and gear maintenance according to the comparison result; and the downshift judging operation is the duration time for judging that the maximum intensity of the signal is less than the minimum value of the current range gear, and if the duration time reaches the configuration time, the downshift operation is performed. The invention adopts a steep ascending and slowly descending mechanism to automatically adjust the range gear, and can avoid the situation that the range gear is repeatedly changed due to the fluctuation change of electromagnetic radiation signals. The invention can eliminate the influence of the bottom noise on the measured value, so that the frequency-selecting type frequency spectrograph can accurately measure the electric field intensity of the current environment no matter under any condition.
Description
Technical Field
The invention relates to the technical field of electromagnetic radiation monitoring, in particular to a control method of a frequency-selective electromagnetic radiation monitor.
Background
With the massive construction of electromagnetic radiation facilities such as 5G base stations, the urban electromagnetic environment becomes more and more complex. In order to carry out the environmental protection law of the people's republic of China, the environmental impact evaluation law of the people's republic of China, the environmental protection management regulations of construction projects, environmental pollution prevention and control of electromagnetic radiation, the ecological environment department of 12 and 14 months in 2020 has approved the electromagnetic radiation environment monitoring method of the 5G mobile communication base station, and the method is implemented from 3 and 1 days in 2021. The standard makes clear the measuring instrument and the testing method, and the 5G base station is required to be measured by using a frequency-selective electromagnetic radiation monitor.
When the existing frequency-selective electromagnetic radiation measurement and analysis instrument is used for monitoring and measuring, a user needs to observe a real-time signal frequency spectrum firstly, then finds the current maximum signal intensity through the real-time frequency spectrum, and then manually sets the measuring range of the instrument according to the intensity to measure. The following drawbacks exist:
(1) the operation is complex and the efficiency is low. Because the signal strength is constantly changing, a measurer must observe the frequency spectrum constantly and switch back and forth between the measuring ranges, and the efficiency is extremely low. Meanwhile, the requirement on the professional level of a measurer is high, and the measurer can select the standard only by the standard to be judged, so that the measurement can be performed.
(2) Time and labor are wasted, and the leakage detection is very easy. In the manual range switching process, the observation, judgment and switching time consumption are long, so that the condition of missing measurement of the instantaneous conversion signal is easily caused in the process, and the measured data is incomplete. The measuring range is manually set, and when a high-intensity signal is sent, the small measuring range can cause overload, so that the measurement is inaccurate, and the large measuring range needs to be manually switched; when no large signal exists, the small range needs to be switched to, otherwise, the signal is submerged due to too high background noise, so that the small signal cannot be measured, and when the signal strength changes rapidly, a user can hardly match the proper range for measurement.
(3) The influence of the bottom noise is large, the measurement precision is low, and the accuracy is low. The superposition of the self background noise of the measuring instrument and the environmental background noise can influence the accuracy of real signal measurement, and the existing equipment is greatly influenced by the background noise, so that the accuracy of the measured signal is poor.
Disclosure of Invention
In order to overcome the defects and shortcomings in the prior art, the invention provides a control method of a frequency-selective electromagnetic radiation monitor, and aims to solve the problems that the existing frequency-selective electromagnetic radiation monitor is complex in operation, low in monitoring efficiency, easy to miss detection and greatly influenced by background noise. The control method of the frequency-selecting electromagnetic radiation monitor provided by the invention can automatically analyze the maximum intensity of the current electromagnetic environment signal, automatically adapt to a proper range, and deduct the bottom noise of the measuring instrument and the bottom noise of the environment when measuring the signal intensity, thereby obtaining accurate signal intensity data.
In order to solve the problems in the prior art, the invention is realized by the following technical scheme:
a control method of a frequency-selective electromagnetic radiation monitor comprises the following steps:
and (3) range selection: the main controller acquires electromagnetic radiation signals monitored by the electromagnetic field sensor at regular time, and calculates the maximum intensity value of the current electromagnetic radiation signals in the current timing period; comparing the maximum intensity value of the current electromagnetic radiation signal with the end value of the range of the current range gear; if the maximum intensity value of the current electromagnetic radiation signal is within the range of the current range gear, the current range gear is kept; if the maximum intensity value of the current electromagnetic radiation signal is smaller than the minimum value of the range of the current range gear, the main controller controls the range selection switch to perform downshift judgment operation; if the maximum intensity value of the current electromagnetic radiation signal is larger than the maximum value of the range of the current range gear, the main controller controls the range selection switch to perform the gear-up operation;
the downshift judging operation specifically means that if the maximum intensity of the current electromagnetic radiation signal is smaller than the minimum value of the current range gear, the main controller temporarily keeps the current range gear; if the maximum intensity values of the electromagnetic radiation signals obtained by the main controller in a plurality of continuous timing periods are all smaller than the minimum value of the current range gear, the main controller controls the range selection switch to perform downshift operation;
the downshift operation is to switch a range gear to a low-range gear adjacent to the current range gear; the upshifting operation is to switch a range gear to a high range gear adjacent to the current range gear; the range ranges between adjacent range gears are partially overlapped; after the range gear is determined, carrying out a bottom noise deduction step;
the bottom noise deducting step specifically comprises the following steps: the main controller regularly acquires an original frequency spectrum acquired by the receiver through the electromagnetic field sensor according to the receiving range of the receiver, and calculates a background noise value of the current original frequency spectrum in the current timing period; obtaining a background noise offset strength value according to the range gear determined in the range selection step;
the main controller compares the spectrum intensity value of each point on the original spectrum with the sum of the background noise value and the background noise offset intensity value of the original spectrum; screening out point locations with a spectrum intensity value larger than or equal to the sum of the original spectrum bottom noise value and the bottom noise offset intensity value on the original spectrum, and neglecting the point locations with a spectrum intensity value smaller than the sum of the original spectrum bottom noise value and the bottom noise offset intensity value; and generating a new spectrogram according to the screened point positions and outputting the spectrogram. The main controller is a central processor of a frequency-selective electromagnetic radiation monitor host, and can be selected from an i.MX6 processor, an ARM 9TDMI processor, an ARM Cortex-A8 processor and the like.
In the downshift judging operation, when the maximum intensity of the current electromagnetic radiation signal is smaller than the minimum value of the range of the current range gear, the main controller starts timing, if a signal larger than the minimum value of the range of the current range gear appears in the timing process, the main controller restarts timing, and when the timing reaches the configured time, the main controller controls the range selection switch to perform downshift operation.
In the downshift judging operation, the configured time is set according to a use scene of the electromagnetic radiation monitor, the use scene comprises fixed-point measurement and drive test measurement, and if the use scene is the fixed-point measurement, the configured time is 10 s; if the usage scenario is a drive test measurement, the configured time is 5 s.
In the range selection step, before the main controller controls the range selection switch to perform downshift operation, the main controller judges whether the current range gear is the lowest gear, performs downshift operation if the current range gear is not the lowest gear, and maintains the current gear if the current range gear is the lowest gear.
In the range selection step, before the main controller controls the range selection switch to perform the upshift operation, the main controller judges whether the current range gear is the highest gear, if not, the upshift operation is performed, and if the current range gear is the highest gear, the current gear is maintained.
In the range selection step, the range is set to 4 gears, and the range ranges between every two adjacent gears are partially overlapped; gear 1 is 0.3mV/m to 300mV/m, gear 2 is 3mV/m to 3V/m, gear 3 is 30mV/m to 30V/m, and gear 4 is 500mV to 500V/m.
In the range selection step, the main controller acquires electromagnetic radiation signals monitored by the electromagnetic field sensor at regular time, specifically: setting different timing periods according to the use scene of the electromagnetic radiation monitor, and calculating the maximum intensity value of the electromagnetic radiation signal acquired in the current period by the main controller in the timing period; the use scene of the electromagnetic radiation meter comprises fixed-point measurement and drive test measurement, and when the fixed-point measurement is carried out, the timing period of the main controller in the measuring range selection step is 100 ms; when the drive test measurement is carried out, the timing period of the main controller in the measuring range selection step is 50 ms.
In the bottom noise deduction step, the bottom noise value is the average value of the spectrum intensity of each point in the current original spectrum, namely the bottom noise value
In the formula (I), wherein,
the value of the noise floor is represented,
respectively representing the spectral intensity values of each point of the current original spectrum,
representing the total number of point bits in the current original spectrum.
The bottom noise offset strength value is preset according to a range gear; setting four gears, wherein the bottom noise offset strength value of the first gear range gear is 0.5db mu v; the bottom noise offset intensity value of the second gear range is 0.5db mu v; the bottom noise offset intensity value of the third gear range is 3.0db mu v; and the noise offset intensity value of the fourth gear range is 8.0db mu v.
Compared with the prior art, the beneficial technical effects brought by the invention are as follows:
1. the control method of the frequency-selecting electromagnetic radiation monitor can realize automatic range selection and automatic background noise deduction, and realize automatic and accurate measurement. The automatic selection of the measuring range is judged according to the maximum intensity value. In the invention, the downshift operation is not directly performed, but performed according to the duration that the maximum intensity value is continuously less than the lower limit value of the current gear; for the upshifting operation, once the maximum intensity value exceeds the upper limit of the current range gear, the upshifting is carried out; the invention adopts a steep ascending and slowly descending mechanism to automatically adjust the range gear, and can avoid the situation that the range gear is repeatedly changed due to the fluctuation change of electromagnetic radiation signals. In the range selection step, when the maximum signal intensity exceeds the maximum value of the current range, the main controller automatically shifts up the current measuring range to ensure that the current range can measure the strongest signal without overload; when the strong signal disappears when the field is detected, the current maximum signal intensity is smaller than the minimum value of the current range, the main controller starts timing, if a value larger than the current minimum signal intensity appears in the timing process, timing is restarted, and when the timing reaches the configured time, the main controller downshifts the current measuring range. Therefore, the small signal can be measured, and the repeated switching of the measuring range when the pulse large signal exists can be avoided.
2. In the invention, the range ranges between adjacent range gears are partially overlapped, so that the condition of inaccurate measurement caused by frequent switching of the range gears when the signal fluctuates can be effectively prevented. When the calculated current maximum signal intensity value is larger than the maximum value of the range of the current range gear, the gear is shifted up immediately; because the overlapping part exists between the adjacent gears, even if the current maximum signal intensity after the gear is shifted up is smaller than the maximum value of the previous gear, the gear can still be in the new gear to be shifted up, and the frequent switching of the range gears is avoided.
3. In the invention, when the upshifting or downshifting is carried out, the upshifting or downshifting is carried out step by step, but not one-step upshifting is carried out. The transition time for the stepwise upshift is a timing period in the span selection step. The invention can avoid inaccurate measurement caused by stepping up and down shift or frequent shift when the span is large during range gear shift.
4. In the invention, the step of deducting the bottom noise can be carried out after the measuring range is determined, the electromagnetic radiation intensity is measured in real time, the electromagnetic radiation measurement is carried out in a proper measuring range, and the measurement precision can be improved. In the bottom noise deduction step, the bottom noise offset caused by the range is considered, and after the equivalent range is determined, the bottom noise offset caused by the range can be deducted when the bottom noise is deducted, so that the measurement precision is further improved. And when the bottom noise deduction step is carried out, the range selection step is carried out synchronously, and after a new range gear is determined, the subsequent measurement carries out bottom noise deduction according to the newly determined range gear. The range selection rule defined by the invention can effectively reduce the measurement error caused by frequent range switching.
5. The control method of the invention provides an efficient means for electromagnetic environment spectrum monitoring, and can greatly reduce the use threshold of an operator, so that a novice can also be competent for complex monitoring and measuring work. Human errors are avoided as much as possible, and the integrity and reliability of the measurement data can be ensured. The operation complexity is reduced to the maximum extent, automatic measurement and analysis are realized, and the working efficiency is comprehensively improved. The influence of the bottom noise on the measured value can be eliminated, so that the electric field intensity of the current environment can be accurately measured by the frequency-selective frequency spectrograph under any condition.
6. In the invention, the configuration time is configured and set according to the use scene of the electromagnetic radiation monitor, the electromagnetic radiation environment is basically fixed during fixed-point measurement, and the requirement on real-time change of the measuring range is low, so that the electromagnetic radiation monitor can be generally set for 10 s; and the drive test measurement has higher requirement on real-time change of the measuring range, and the configuration time can be set to be 5 s. In the range selection step, the timing period of the electromagnetic radiation signal monitored by the electromagnetic field sensor can be obtained by the main controller at regular time, and can also be configured according to the use scene, so that the frequency-selective electromagnetic radiation monitor can be changed according to the use scene, and the adaptability is stronger.
7. In the invention, the range is set to 4 gears, and the range between each two adjacent gears is partially overlapped; gear 1 is 0.3mV/m to 300mV/m, gear 2 is 3mV/m to 3V/m, gear 3 is 30mV/m to 30V/m, and gear 4 is 500mV to 500V/m. The invention sets 4 gears, can meet the characteristic requirements of electromagnetic radiation measurement and reduce the requirement of frequent gear shifting as much as possible, and aims to avoid inaccurate measurement (time is changed in space) even if the gear shifting is not carried out immediately when the signal fluctuates.
8. The average value of the spectrum intensity of each point of the spectrum is used as a background noise value which is very close to the actual background noise value, and the method can be used for quickly calculating, so that the calculation pressure of a main controller is reduced; ensuring the main control to respond quickly.
9. In the invention, the bottom noise offset intensity is a value obtained according to the range and the corresponding spectrum debugging measurement, and most of bottom noises can be deducted without influencing the actual signal after ensuring the bottom noise value plus the bottom noise offset intensity value.
Drawings
FIG. 1 is a flow chart of the range selection step of the present invention;
FIG. 2 is a flow chart of the background subtraction step of the present invention.
Detailed Description
The technical scheme of the invention is further elaborated in the following by combining the drawings in the specification. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to the accompanying drawings 1 and 2 in the specification, the embodiment discloses a control method of a frequency-selective electromagnetic radiation monitor, which comprises the following steps:
and (3) range selection: the main controller acquires electromagnetic radiation signals monitored by the electromagnetic field sensor at regular time, and calculates the maximum intensity value of the current electromagnetic radiation signals in the current timing period; comparing the maximum intensity value of the current electromagnetic radiation signal with the end value of the range of the current range gear; if the maximum intensity value of the current electromagnetic radiation signal is within the range of the current range gear, the current range gear is kept; if the maximum intensity value of the current electromagnetic radiation signal is smaller than the minimum value of the range of the current range gear, the main controller controls the range selection switch to perform downshift judgment operation; if the maximum intensity value of the current electromagnetic radiation signal is larger than the maximum value of the range of the current range gear, the main controller controls the range selection switch to perform the gear-up operation;
the downshift judging operation specifically means that if the maximum intensity of the current electromagnetic radiation signal is smaller than the minimum value of the current range gear, the main controller temporarily keeps the current range gear; if the maximum intensity values of the electromagnetic radiation signals obtained by the main controller in a plurality of continuous timing periods are all smaller than the minimum value of the current range gear, the main controller controls the range selection switch to perform downshift operation;
the downshift operation is to switch a range gear to a low-range gear adjacent to the current range gear; the upshifting operation is to switch a range gear to a high range gear adjacent to the current range gear; the range ranges between adjacent range gears are partially overlapped; after the range gear is determined, carrying out a bottom noise deduction step;
the bottom noise deducting step specifically comprises the following steps: the main controller regularly acquires an original frequency spectrum acquired by the receiver through the electromagnetic field sensor according to the receiving range of the receiver, and calculates a background noise value of the current original frequency spectrum in the current timing period; obtaining a background noise offset strength value according to the range gear determined in the range selection step;
the main controller compares the spectrum intensity value of each point on the original spectrum with the sum of the background noise value and the background noise offset intensity value of the original spectrum; screening out point locations with a spectrum intensity value larger than or equal to the sum of the original spectrum bottom noise value and the bottom noise offset intensity value on the original spectrum, and neglecting the point locations with a spectrum intensity value smaller than the sum of the original spectrum bottom noise value and the bottom noise offset intensity value; and generating a new spectrogram according to the screened point positions and outputting the spectrogram. The main controller is a central processor of a frequency-selective electromagnetic radiation monitor host, and can be selected from an i.MX6 processor, an ARM 9TDMI processor, an ARM Cortex-A8 processor and the like.
As an implementation manner of this embodiment, an initial range gear is set in the electromagnetic radiation detector, that is, after starting up each time, the range gear is located at the initial range gear; setting a general initial range gear as a minimum gear; after the electromagnetic radiation monitor is started, an operator selects a use scene on an operation interface of the electromagnetic radiation monitor according to the current use scene, wherein the use scene comprises but is not limited to a fixed-point measurement scene and a drive test measurement scene, and the use scene can be specifically divided according to a specific use environment.
After an operator selects a use scene, the main controller periodically acquires electromagnetic radiation signals monitored by the electromagnetic field sensor according to the selected use scene and according to sampling calculation periods selected by different measuring ranges corresponding to different preset use scenes in the electromagnetic radiation monitor; the electromagnetic field sensor is a triaxial antenna. The main controller regularly acquires electromagnetic radiation signals monitored by the electromagnetic field sensor, and specifically comprises the following steps: setting different timing periods according to the use scene of the electromagnetic radiation monitor, and calculating the maximum intensity value of the electromagnetic radiation signal acquired in the current period by the main controller in the timing period; the use scene of the electromagnetic radiation meter comprises fixed-point measurement and drive test measurement, and when the fixed-point measurement is carried out, the timing period of the main controller in the measuring range selection step is 100 ms; when the drive test measurement is carried out, the timing period of the main controller in the measuring range selection step is 50 ms.
Calculating the maximum intensity value of the current electromagnetic radiation signal in the current timing period; comparing the maximum intensity value of the current electromagnetic radiation signal with the end value of the range of the current range gear; if the maximum intensity value of the current electromagnetic radiation signal is within the range of the current range gear, the current range gear is kept; if the maximum intensity value of the current electromagnetic radiation signal is smaller than the minimum value of the range of the current range gear, the main controller controls the range selection switch to perform downshift judgment operation; if the maximum intensity value of the current electromagnetic radiation signal is larger than the maximum value of the range of the current range gear, the main controller controls the range selection switch to perform the gear-up operation; when the main controller controls the range selection switch to perform the gear-up operation, the main controller performs the gear-up operation step by step, and the method specifically comprises the following steps: the initial gear is a first gear, the maximum value of the electromagnetic radiation signal in the current timing period is greater than the maximum value of the first gear, the second gear is upgraded, and the third gear is upgraded when the maximum value of the electromagnetic radiation signal obtained by calculation in the next timing period is still greater than the maximum value after the gear is upgraded; and then judging whether the maximum value of the electromagnetic radiation signal is in the range of the third gear in the next timing period, if so, keeping the range gear in the third gear, and then carrying out a bottom noise deduction step.
If the maximum intensity of the current electromagnetic radiation signal is smaller than the minimum value of the current range gear, the main controller temporarily keeps the current range gear; the main controller starts timing, and if the maximum intensity values of the electromagnetic radiation signals obtained by a plurality of continuous timing cycles are smaller than the minimum value of the current range gear within a timing period, the main controller controls the range selection switch to perform downshift operation; if the time reaches the configured time, the main controller controls the range selection switch to perform downshift operation. The configuration time is set according to the use scene of the electromagnetic radiation monitor, the use scene comprises fixed-point measurement and drive test measurement, and if the use scene is the fixed-point measurement, the configuration time is 10 s; if the usage scenario is a drive test measurement, the configured time is 5 s.
Furthermore, before the main controller controls the range selection switch to perform downshift operation, the main controller determines whether the current range gear is the lowest gear, performs downshift operation if the current range gear is not the lowest gear, and maintains the current gear if the current range gear is the lowest gear.
Furthermore, before the main controller controls the range selection switch to perform the shift-up operation, the main controller determines whether the current range gear is the highest gear, performs the shift-up operation if the current range gear is not the highest gear, and maintains the current gear if the current range gear is the highest gear.
As another implementation manner of this embodiment, in the range selection step, the range is set to 4 gears, and the range ranges between each two adjacent gears are partially overlapped; gear 1 is 0.3mV/m to 300mV/m, gear 2 is 3mV/m to 3V/m, gear 3 is 30mV/m to 30V/m, and gear 4 is 500mV to 500V/m. 4 gears are set, so that the characteristic requirement of electromagnetic radiation measurement can be met, and the requirement of frequent gear shifting is reduced as much as possible, so that the purpose of the method is that inaccurate measurement (time is changed in space) cannot be caused even if the gear shifting is not carried out immediately when the signal fluctuates.
After the equivalent range gear is determined, the main controller regularly acquires an original frequency spectrum acquired by the electromagnetic field sensor of the receiver according to the receiving range of the receiver, and calculates the background noise value of the current original frequency spectrum in the current timing period; obtaining a background noise offset strength value according to the range gear determined in the range selection step; the main controller compares the spectrum intensity value of each point on the original spectrum with the sum of the background noise value and the background noise offset intensity value of the original spectrum; screening out point locations with a spectrum intensity value larger than or equal to the sum of the original spectrum bottom noise value and the bottom noise offset intensity value on the original spectrum, and neglecting the point locations with a spectrum intensity value smaller than the sum of the original spectrum bottom noise value and the bottom noise offset intensity value; and generating a new spectrogram according to the screened point positions and outputting the spectrogram.
In the bottom noise deduction step, the bottom noise value is the average value of the spectrum intensity of each point in the current original spectrum, namely the bottom noise value
In the formula (I), wherein,
the value of the noise floor is represented,
respectively representing the spectral intensity values of each point of the current original spectrum,
representing the total number of point bits in the current original spectrum.
The bottom noise offset strength value is preset according to a range gear; setting four gears, wherein the bottom noise offset strength value of the first gear range gear is 0.5db mu v; the bottom noise offset intensity value of the second gear range is 0.5db mu v; the bottom noise offset intensity value of the third gear range is 3.0db mu v; and the noise offset intensity value of the fourth gear range is 8.0db mu v.
Claims (9)
1. A control method of a frequency-selective electromagnetic radiation monitor is characterized by comprising the following steps:
and (3) range selection: the main controller acquires electromagnetic radiation signals monitored by the electromagnetic field sensor at regular time, and calculates the maximum intensity value of the current electromagnetic radiation signals in the current timing period; comparing the maximum intensity value of the current electromagnetic radiation signal with the end value of the range of the current range gear; if the maximum intensity value of the current electromagnetic radiation signal is within the range of the current range gear, the current range gear is kept; if the maximum intensity value of the current electromagnetic radiation signal is smaller than the minimum value of the range of the current range gear, the main controller controls the range selection switch to perform downshift judgment operation; if the maximum intensity value of the current electromagnetic radiation signal is larger than the maximum value of the range of the current range gear, the main controller controls the range selection switch to perform the gear-up operation;
the downshift judging operation specifically means that if the maximum intensity of the current electromagnetic radiation signal is smaller than the minimum value of the current range gear, the main controller temporarily keeps the current range gear; if the maximum intensity values of the electromagnetic radiation signals obtained by the main controller in a plurality of continuous timing periods are all smaller than the minimum value of the current range gear, the main controller controls the range selection switch to perform downshift operation;
the downshift operation is to switch a range gear to a low-range gear adjacent to the current range gear; the upshifting operation is to switch a range gear to a high range gear adjacent to the current range gear; the range ranges between adjacent range gears are partially overlapped; after the range gear is determined, carrying out a bottom noise deduction step;
the bottom noise deducting step specifically comprises the following steps: the main controller regularly acquires an original frequency spectrum acquired by the receiver through the electromagnetic field sensor according to the receiving range of the receiver, and calculates a background noise value of the current original frequency spectrum in the current timing period; obtaining a background noise offset strength value according to the range gear determined in the range selection step;
the main controller compares the spectrum intensity value of each point on the original spectrum with the sum of the background noise value and the background noise offset intensity value of the original spectrum; screening out point locations with a spectrum intensity value larger than or equal to the sum of the original spectrum bottom noise value and the bottom noise offset intensity value on the original spectrum, and neglecting the point locations with a spectrum intensity value smaller than the sum of the original spectrum bottom noise value and the bottom noise offset intensity value; and generating a new spectrogram according to the screened point positions and outputting the spectrogram.
2. The method of claim 1, wherein the step of controlling the frequency-selective electromagnetic radiation monitor comprises: in the downshift judging operation, when the maximum intensity of the current electromagnetic radiation signal is smaller than the minimum value of the range of the current range gear, the main controller starts timing, if a signal larger than the minimum value of the range of the current range gear appears in the timing process, the main controller restarts timing, and when the timing reaches the configured time, the main controller controls the range selection switch to perform downshift operation.
3. The method of claim 2, wherein the step of controlling the frequency-selective electromagnetic radiation monitor comprises: in the downshift judging operation, the configured time is set according to a use scene of the electromagnetic radiation monitor, the use scene comprises fixed-point measurement and drive test measurement, and if the use scene is the fixed-point measurement, the configured time is 10 s; if the usage scenario is a drive test measurement, the configured time is 5 s.
4. A method of controlling a frequency selective electromagnetic radiation monitor according to any one of claims 1 to 3, wherein: in the range selection step, before the main controller controls the range selection switch to perform downshift operation, the main controller judges whether the current range gear is the lowest gear, performs downshift operation if the current range gear is not the lowest gear, and maintains the current gear if the current range gear is the lowest gear.
5. A method of controlling a frequency selective electromagnetic radiation monitor according to any one of claims 1 to 3, wherein: in the range selection step, before the main controller controls the range selection switch to perform the upshift operation, the main controller judges whether the current range gear is the highest gear, if not, the upshift operation is performed, and if the current range gear is the highest gear, the current gear is maintained.
6. A method of controlling a frequency selective electromagnetic radiation monitor according to any one of claims 1 to 3, wherein: in the range selection step, the range is set to 4 gears, and the range ranges between every two adjacent gears are partially overlapped; gear 1 is 0.3mV/m to 300mV/m, gear 2 is 3mV/m to 3V/m, gear 3 is 30mV/m to 30V/m, and gear 4 is 500mV to 500V/m.
7. A method of controlling a frequency selective electromagnetic radiation monitor according to any one of claims 1 to 3, wherein: in the range selection step, the main controller acquires electromagnetic radiation signals monitored by the electromagnetic field sensor at regular time, specifically: setting different timing periods according to the use scene of the electromagnetic radiation monitor, and calculating the maximum intensity value of the electromagnetic radiation signal acquired in the current period by the main controller in the timing period; the use scene of the electromagnetic radiation monitor comprises fixed-point measurement and drive test measurement, and when the fixed-point measurement is carried out, the timing period of the main controller in the measuring range selection step is 100 ms; when the drive test measurement is carried out, the timing period of the main controller in the measuring range selection step is 50 ms.
8. The method of claim 1, wherein the step of controlling the frequency-selective electromagnetic radiation monitor comprises: in the bottom noise deduction step, the bottom noise value is the average value of the spectrum intensity of each point in the current original spectrum, namely the bottom noise value
In the formula (I), wherein,
the value of the noise floor is represented,
respectively representing the spectral intensity values of each point of the current original spectrum,
representing the total number of point bits in the current original spectrum.
9. The method of claim 6, wherein the step of controlling the frequency-selective electromagnetic radiation monitor comprises: the bottom noise offset strength value is preset according to a range gear; setting four gears, wherein the bottom noise offset strength value of the first gear range gear is 0.5db mu v; the bottom noise offset intensity value of the second gear range is 0.5db mu v; the bottom noise offset intensity value of the third gear range is 3.0db mu v; and the noise offset intensity value of the fourth gear range is 8.0db mu v.
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