Electromagnetic suppression maximum distance prediction method and device, equipment and storage medium

Abstract

The invention provides an electromagnetic suppression maximum distance prediction method and device, equipment and a storage medium, and particularly relates to the technical field of electromagnetic spectrum management and control. According to the method, the minimum harmful interference power, the frequency suppression factor and the interference equivalent radiation power are calculated by obtaining the spectrum characteristic parameters of electromagnetic control equipment and the spectrum characteristic parameters of a suppressed target radio station; and calculating according to the spectrum characteristic parameter of the electromagnetic control equipment, the spectrum characteristic parameter of the suppressed target radio station, the frequency suppression factor, the minimum harmful interference power and the interference equivalent radiation power, and predicting the maximum electromagnetic suppression distance by considering the earth large circle sight distance blocking factor. According to the method, the problems of weak universality and low operation efficiency caused by single influence factor considered by the maximum distance prediction method and adoption of field intensity vector operation in the existing electromagnetic control situation are solved, so that the practicability of displaying the maximum control area of the electromagnetic control equipment in the electromagnetic control situation presentation is improved; and the efficiency and the accuracy of electromagnetic control are improved.

Description

Technical Field

[0001] The present invention relates to the field of electromagnetic spectrum control technology, and in particular to a method, device, equipment and storage medium for predicting the maximum distance of electromagnetic suppression. Background Art

[0002] In the mission of supporting major events in key areas, electromagnetic control equipment can effectively prevent unauthorized drones, walkie-talkies or other types of radio communication equipment from illegally invading key areas by implementing electromagnetic suppression. Electromagnetic suppression uses interference technology to radiate interference signals to target radio stations to obstruct the communication of target radio stations. Electromagnetic control situation is usually used to comprehensively present relevant information of electromagnetic control, including electromagnetic control area, implementation time, type of controlled radio station, control means, control equipment, etc. Among them, the electromagnetic control area is one of the important information. Accurately predicting the maximum coverage area of ​​electromagnetic control carried out by electromagnetic control equipment is of great significance for control personnel to carry out deployment and scheduling of electromagnetic control equipment and use decision-making and command.

[0003] At present, the maximum distance prediction technology for electromagnetic control is still immature and has limited application. Some prediction methods consider a single influencing factor, resulting in the prediction method's low practicality. Some prediction methods use vectors for calculation, the calculation process is cumbersome, the calculation efficiency is low, and it is difficult to meet the needs of rapid response.

[0004] Therefore, how to comprehensively consider the influencing factors of various maximum distance prediction methods in the electromagnetic control situation and use a simple calculation method to predict the maximum distance of electromagnetic control is a problem that technical personnel in this field need to solve. Summary of the invention

[0005] The main purpose of the present invention is to provide a method, device, equipment and storage medium for predicting the maximum distance of electromagnetic suppression, so as to at least solve the problem that the maximum distance prediction method in the existing electromagnetic control situation considers a single influencing factor and adopts field strength vector calculation, resulting in weak versatility and low calculation efficiency, thereby improving the practicality of displaying the maximum control area of ​​electromagnetic control equipment in the electromagnetic control situation presentation.

[0006] In order to achieve the above-mentioned objectives, the present invention provides a method, device, equipment and storage medium for predicting the maximum distance of electromagnetic suppression, which comprehensively considers the influence of multi-domain characteristics of the electromagnetic spectrum, such as the frequency domain, spatial domain, energy domain and modulation domain, and quickly predicts the maximum distance of electromagnetic suppression through simple power scalar calculation, so as to improve the practicality and accuracy of the prediction of the maximum distance of electromagnetic suppression.

[0007] In a first aspect, the present invention provides a method for predicting the maximum distance of electromagnetic suppression, the method comprising the following steps:

[0008] Step S201: Acquire the spectrum characteristic parameters of the electromagnetic control equipment and the spectrum characteristic parameters of the suppressed target radio station, wherein the spectrum characteristic parameters of the electromagnetic control equipment include: the transmission power spectrum density P i (f), electromagnetic control equipment working center frequency f i , Transmitting antenna gain pattern G i (θ), effective height of transmitting antenna h i The suppressed target radio station spectrum characteristic parameters include: the target radio station working center frequency f c , target radio station operating bandwidth B, receiving antenna gain pattern G r (θ), receiver noise factor NF, receiving antenna effective height h r , received spectrum template |H(f)| 2 , harmful interference coefficient α;

[0009] Step S202: According to the target station working bandwidth B, the receiver noise factor NF, the harmful interference coefficient α, the receiving antenna gain pattern G r (θ), calculate the minimum harmful interference power I received by the target station min ;

[0010] Step S203: According to the transmission power spectrum density P i (f), the target radio station receiving spectrum template |H(f)| 2 、The working center frequency f of the electromagnetic control equipment i , the target radio station operating center frequency f c , calculate the frequency suppression factor FDR;

[0011] Step S204: According to the transmitting antenna gain pattern G i (θ), the transmission power spectrum density P i (f), calculate the interference equivalent radiated power I e.i.r.p ;

[0012] Step S205: According to the receiving antenna gain G r (θ i ), the target radio station working bandwidth B, the electromagnetic control equipment working center frequency f i , the receiver noise factor NF, the harmful interference coefficient α, the frequency suppression factor FDR, the minimum harmful interference power I min , the interference equivalent radiated power I e.i.r.p , the effective height of the receiving antenna h r , the transmitting antenna effective height h i Calculate, predict and output the maximum electromagnetic suppression distance d max .

[0013] Furthermore, the step S202 includes:

[0014] According to the target radio station operating bandwidth B, the receiver noise factor NF, the harmful interference coefficient α, the receiving antenna gain pattern G r (θ), the minimum harmful interference power I is calculated using the following formula: min :

[0015] I min =10·lg(KTB)+NF+α-G r (θ i )

[0016] Where lg(·) represents the logarithmic function with base 10, K is the Boltzmann constant, T is the room temperature Kelvin, G r (θ i ) is the receiving antenna gain of the target station in the interference path direction, and the receiving antenna gain of the target station in the interference path direction is obtained by finding the receiving antenna gain pattern G r (θ) i The corresponding value is obtained, θ i is the interference azimuth, that is, the clockwise angle between true north and the interference path.

[0017] Furthermore, the step S203 includes:

[0018] According to the transmission power spectrum density P i (f), the received spectrum template |H(f)| 2 、The working center frequency f of the electromagnetic control equipment i , the target radio station operating center frequency f c , the frequency suppression factor FDR is calculated using the following formula:

[0019]

[0020] Among them, △f is the working center frequency f of the electromagnetic control equipment i The target radio station's operating center frequency f c The difference between i -f c .

[0021] Furthermore, the step S204 includes:

[0022] According to the transmitting antenna gain pattern G i (θ), the transmission power spectrum density P i (f), the interference equivalent radiated power I is calculated using the following formula: e.i.r.p :

[0023] I e.i.r.p =P i +G i (θ i ')

[0024] Among them, P i is the transmitting power of electromagnetic control equipment, P i =10·lg(∫P i (f)df),G i (θ i ') is the transmitting antenna gain in the interference path direction of the electromagnetic control equipment, and the transmitting antenna gain in the interference path direction of the electromagnetic control equipment is obtained by finding the transmitting antenna gain pattern G i (θ) i 'The corresponding value is obtained, θ i ' is the interference azimuth, that is, the clockwise angle between the true north and the interference path, and θ i '=θ i +180.

[0025] Furthermore, the step S205 includes:

[0026] According to the receiving antenna gain G r (θ i ), the target radio station working bandwidth B, the electromagnetic control equipment working center frequency f i , the receiver noise factor NF, the harmful interference coefficient α, the frequency suppression factor FDR, the minimum harmful interference power I min , the interference equivalent radiated power I e.i.r.p , the effective height of the receiving antenna h r , the transmitting antenna effective height h i , calculate the electromagnetic suppression path distance d p The apparent distance d from the smooth earth surface los ;

[0027] According to the smooth earth spherical visual distance d los and the electromagnetic suppression path distance d p , calculate the maximum electromagnetic suppression distance d max ;

[0028] Specifically, according to the receiving antenna gain G r (θ i ), the target radio station working bandwidth B, the electromagnetic control equipment working center frequency f i , the receiver noise factor NF, the harmful interference coefficient α, the frequency suppression factor FDR, the minimum harmful interference power I min, the interference equivalent radiated power I e.i.r.p , the electromagnetic suppression path distance d is calculated by the following formula p :

[0029]

[0030] Specifically, according to the effective height h of the transmitting antenna i and the effective height of the receiving antenna h r , use the following formula to calculate the smooth earth spherical line of sight distance d los :

[0031]

[0032] Specifically, according to the smooth earth spherical line of sight distance d los and the electromagnetic suppression path distance d p , use the following formula to calculate the maximum electromagnetic suppression distance d max :

[0033] d max =min{d los ,d p} / K e

[0034] Among them, min{d los ,d p} means taking d los and d p The minimum of the two values, K e is the equivalent earth radius coefficient, K e =4 / 3.

[0035] In a second aspect, the present invention provides an electromagnetic suppression maximum distance prediction device, which is applied to various possible implementations of the first aspect, including:

[0036] The acquisition module is used to execute step S201: obtain the spectrum characteristic parameters of the electromagnetic control equipment and the spectrum characteristic parameters of the suppressed target radio station, wherein the spectrum characteristic parameters of the electromagnetic control equipment include: the transmission power spectrum density P i (f), electromagnetic control equipment working center frequency f i , Transmitting antenna gain pattern G i (θ), effective height of transmitting antenna h i The suppressed target radio station spectrum characteristic parameters include: the target radio station working center frequency f c , target radio station operating bandwidth B, receiving antenna gain pattern G r (θ), receiver noise factor NF, receiving antenna effective height h r, received spectrum template |H(f)| 2 , harmful interference coefficient α;

[0037] The calculation module is used to execute step S202: according to the target station working bandwidth B, the receiver noise factor NF, the harmful interference coefficient α, the receiving antenna gain pattern G r (θ), calculate the minimum harmful interference power I of the target station min ;

[0038] The calculation module is further used to execute step S203: according to the transmit power spectrum density P i (f), the received spectrum template |H(f)| 2 、The working center frequency f of the electromagnetic control equipment i , the target radio station operating center frequency f c , calculate the frequency suppression factor FDR;

[0039] The calculation module is further used to execute step S204: according to the transmit antenna gain pattern G i (θ), the transmission power spectrum density P i (f), calculate the interference equivalent radiated power I e.i.r.p ;

[0040] The calculation module is further used to execute step S205: according to the receiving antenna gain G r (θ i ), the target radio station working bandwidth B, the electromagnetic control equipment working center frequency f i , the receiver noise factor NF, the harmful interference coefficient α, the frequency suppression factor FDR, the minimum harmful interference power I min , the interference equivalent radiated power I e.i.r.p , the effective height of the receiving antenna h r , the transmitting antenna effective height h i Calculate, predict and output the maximum electromagnetic suppression distance d max ;

[0041] Output module, the output module is used to execute step S205: output the maximum electromagnetic suppression distance d max .

[0042] Optionally, the calculation module is specifically configured to calculate the target radio station operating bandwidth B, the receiver noise factor NF, the harmful interference coefficient α, the receiving antenna gain pattern G r (θ), the minimum harmful interference power I is calculated using the following formula: min :

[0043] I min =10·lg(KTB)+NF+α-G r (θ i )

[0044] Where lg(·) represents the logarithmic function with base 10, K is the Boltzmann constant, T is the room temperature Kelvin, G r (θ i ) is the receiving antenna gain of the target station in the interference path direction, and the receiving antenna gain of the target station in the interference path direction is obtained by finding the receiving antenna gain pattern G r (θ) i The corresponding value is obtained, θ i is the interference azimuth, that is, the clockwise angle between true north and the interference path.

[0045] Optionally, the calculation module is specifically configured to calculate the transmission power spectrum density P according to the transmission power spectrum density P i (f), the received spectrum template |H(f)| 2 、The working center frequency f of the electromagnetic control equipment i , the target radio station operating center frequency f c , the frequency suppression factor FDR is calculated using the following formula:

[0046]

[0047] Among them, △f is the working center frequency f of the electromagnetic control equipment i The target radio station's operating center frequency f c The difference between i -f c .

[0048] Optionally, the calculation module is specifically configured to calculate the transmission antenna gain pattern G according to the transmission antenna gain pattern G i (θ), the transmission power spectrum density P i (f), the interference equivalent radiated power I is calculated using the following formula: e.i.r.p :

[0049] I e.i.r.p =P i +G i (θ i ')

[0050] Among them, P i is the transmitting power of electromagnetic control equipment, P i =10·lg(∫P i (f)df),G i (θ i') is the transmitting antenna gain in the interference path direction of the electromagnetic control equipment, and the transmitting antenna gain in the interference path direction of the electromagnetic control equipment is obtained by finding the transmitting antenna gain pattern G i (θ) i 'The corresponding value is obtained, θ i ' is the interference azimuth, that is, the clockwise angle between the true north and the interference path, and θ i '=θ i +180.

[0051] Optionally, the calculation module is specifically configured to calculate the gain of the receiving antenna G according to r (θ i ), the target radio station working bandwidth B, the electromagnetic control equipment working center frequency f i , the receiver noise factor NF, the harmful interference coefficient α, the frequency suppression factor FDR, the minimum harmful interference power I min , the interference equivalent radiated power I e.i.r.p , the electromagnetic suppression path distance d is calculated by the following formula p :

[0052]

[0053] Optionally, the calculation module is specifically configured to calculate the effective height h of the transmitting antenna according to the i and the effective height of the receiving antenna h r , use the following formula to calculate the smooth earth spherical line of sight distance d los :

[0054]

[0055] Optionally, the calculation module is specifically configured to calculate the smooth earth spherical surface line of sight distance d los and the electromagnetic suppression path distance d p , use the following formula to calculate the maximum electromagnetic suppression distance d max :

[0056] d max =min{d los ,d p} / K e

[0057] Among them, min{d los ,d p} means taking d los and d p The minimum of the two values, K e is the equivalent earth radius coefficient, K e =4 / 3.

[0058] In a third aspect, the present invention provides an electromagnetic suppression maximum distance prediction device, the device comprising:

[0059] Memory;

[0060] processor;

[0061] Wherein, the memory stores computer-executable instructions;

[0062] The processor executes the computer-executable instructions stored in the memory to implement the first aspect and / or various possible electromagnetic suppression maximum distance prediction methods of the first aspect.

[0063] In a fourth aspect, the present invention provides a computer storage medium storing computer execution instructions, which, when executed by a processor, are used to implement the first aspect above and / or various possible electromagnetic suppression maximum distance prediction methods of the first aspect.

[0064] The electromagnetic suppression maximum distance prediction method, device, equipment and storage medium provided by the present invention calculate the minimum harmful interference power I by obtaining the spectrum characteristic parameters of the electromagnetic control equipment and the spectrum characteristic parameters of the suppressed target radio station. min , frequency suppression factor FDR and interference equivalent radiated power I e.i.r.p According to the spectrum characteristic parameters of electromagnetic control equipment, spectrum characteristic parameters of suppressed target radio station, frequency suppression factor FDR, minimum harmful interference power I min And interference equivalent radiated power I e.i.r.p Calculations are performed to predict the maximum distance of electromagnetic suppression. The maximum distance of electromagnetic suppression can be used as a comprehensive indicator of electromagnetic control effect and applied to the presentation of electromagnetic situation. This method introduces relevant important spectrum characteristic parameters to participate in the calculation based on the multi-domain characteristics of the electromagnetic spectrum, such as frequency domain, space domain, energy domain and modulation domain. This method solves the problem of single influencing factors considered in the existing electromagnetic control situation by the maximum distance prediction method and weak versatility and low computational efficiency due to the use of field strength vector calculation, thereby improving the practicality of displaying the maximum control area of ​​electromagnetic control equipment in the presentation of electromagnetic control situation. BRIEF DESCRIPTION OF THE DRAWINGS

[0065] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0066] Figure 1 A diagram showing an application scenario of the electromagnetic suppression maximum distance prediction method provided by the present invention;

[0067] Figure 2A schematic diagram of the flow chart of the electromagnetic suppression maximum distance prediction method provided by the present invention;

[0068] Figure 3 A spectrum template simulation diagram of the electromagnetic control equipment of the electromagnetic suppression maximum distance prediction method provided by the present invention;

[0069] Figure 4 A spectrum template simulation diagram of the target radio station received by the electromagnetic suppression maximum distance prediction method provided by the present invention;

[0070] Figure 5 An analysis diagram of the same-frequency suppression situation of a target radio station of the electromagnetic suppression maximum distance prediction method provided by the present invention;

[0071] Figure 6 An analysis diagram of the relationship between the maximum electromagnetic suppression distance and the transmission power of a target radio station of the electromagnetic suppression maximum distance prediction method provided by the present invention;

[0072] Figure 7 An analysis diagram of the relationship between the maximum electromagnetic suppression distance of a target radio station and the height of a transmitting antenna according to the electromagnetic suppression maximum distance prediction method provided by the present invention;

[0073] Figure 8 A schematic diagram of a device for predicting the maximum distance of electromagnetic suppression provided by the present invention;

[0074] Fig. 9 A schematic diagram of the electromagnetic suppression maximum distance prediction device provided by the present invention.

[0075] The above drawings have shown clear embodiments of the present invention, which will be described in more detail below. These drawings and text descriptions are not intended to limit the scope of the present invention in any way, but to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0076] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0077] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in sequences other than those illustrated or described herein.

[0078] In the present invention, words such as "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in the present invention should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present the relevant concepts in a specific way.

[0079] In the mission of supporting major events in key areas, electromagnetic control equipment can effectively prevent unauthorized drones, walkie-talkies or other types of radio communication equipment from illegally invading key areas by implementing electromagnetic suppression. Electromagnetic suppression uses interference technology to radiate interference signals to target radio stations to block the communication of target radio stations. Electromagnetic control situation is usually used to comprehensively display relevant information of electromagnetic control, including electromagnetic control area, implementation time, type of controlled radio station, control means, control equipment, etc. Among them, the electromagnetic control area is one of the important information. Accurately predicting the maximum coverage area of ​​electromagnetic control is of great significance to the deployment and scheduling of control personnel and the use of decision-making and command.

[0080] At present, the maximum distance prediction technology for electromagnetic control is still immature and has limited application. Some prediction methods consider a single influencing factor, resulting in the prediction method's low practicality. Some prediction methods use vectors for calculation, the calculation process is cumbersome, the calculation efficiency is low, and it is difficult to meet the needs of rapid response.

[0081] Therefore, how to quickly predict the maximum distance of electromagnetic suppression while comprehensively considering multiple influencing factors is a problem that technicians in this field need to solve.

[0082] The electromagnetic suppression maximum distance prediction method, device, equipment and storage medium provided by the present invention calculate the minimum harmful interference power I by obtaining the spectrum characteristic parameters of the electromagnetic control equipment and the spectrum characteristic parameters of the suppressed target radio station. min , frequency suppression factor FDR and interference equivalent radiated power I e.i.r.p According to the spectrum characteristic parameters of electromagnetic control equipment, spectrum characteristic parameters of suppressed target radio station, frequency suppression factor FDR, minimum harmful interference power I min And interference equivalent radiated power I e.i.r.pThe method introduces relevant important spectrum characteristic parameters to participate in the calculation based on the multi-domain characteristics of the electromagnetic spectrum, such as frequency domain, space domain, energy domain and modulation domain, and solves the problems of the single influencing factor considered in the existing electromagnetic control situation and the weak versatility and low calculation efficiency caused by the use of field strength vectors for calculation, thereby improving the practicality of displaying the maximum control area of ​​electromagnetic control equipment in the electromagnetic control situation presentation and improving the efficiency and accuracy of electromagnetic control.

[0083] Figure 1 The application scenario diagram of the electromagnetic suppression maximum distance prediction method provided by the present invention is as follows: Figure 1 As shown, it illustrates a typical application scenario of electromagnetic suppression to which the present invention is applicable. The electromagnetic control equipment will not be located at the maximum suppression distance d max The communication of the target station outside the area is affected, such as the target station (receiving end) of communication link 1; located at the maximum suppression distance d max Whether the communication stations in the area are subject to harmful interference requires further specific calculation, such as the target station (receiving end) of communication link 2.

[0084] The technical solution of the present invention and how the technical solution of the present invention solves the above-mentioned technical problems are described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present invention will be described below in conjunction with the accompanying drawings.

[0085] This embodiment uses the actual high-power transmitting device S108A as the electromagnetic control equipment and the walkie-talkie NXDN as the target radio for simulation. The spectrum characteristic parameters of the electromagnetic control equipment are obtained by actual measurement, and the spectrum characteristic parameters of the target radio are obtained from the technical manual and technical specifications. The electromagnetic control equipment has a transmitting power of 50W, a working center frequency of 441.14MHz, an omnidirectional transmitting antenna gain of 1.5dB, a transmitting antenna height of 60m, and an average ground object height of 3m. The target radio has an operating center frequency of 441.14MHz, a bandwidth of 16kHz, a signal modulation type of FM, an omnidirectional antenna gain of 1dB, a receiving antenna height of 3m, a noise factor of 5dB, and a harmful interference factor of 6dB.

[0086] Figure 2 The flowchart of the electromagnetic suppression maximum distance prediction method provided by the present invention is a detailed description of the electromagnetic suppression maximum distance prediction method, such as Figure 2 As shown, the electromagnetic suppression maximum distance prediction method provided by the present invention comprises:

[0087] Step S201: Acquire the spectrum characteristic parameters of the electromagnetic control equipment and the spectrum characteristic parameters of the suppressed target radio station, wherein the spectrum characteristic parameters of the electromagnetic control equipment include: the transmission power spectrum density P i (f), electromagnetic control equipment working center frequency fi, transmitting antenna gain pattern G i (θ), effective height of transmitting antenna h i The spectrum characteristic parameters of the suppressed target radio station include: the target radio station working center frequency f c , target radio station operating bandwidth B, receiving antenna gain pattern G r (θ), receiver noise factor NF, receiving antenna effective height h r , received spectrum template |H(f)| 2 , harmful interference coefficient α.

[0088] Specifically, the spectrum characteristic parameters of the electromagnetic control equipment and the spectrum characteristic parameters of the suppressed target radio station are obtained according to industry standards or specifications, product technical manuals, etc., or through a radio monitoring and direction finding system.

[0089] Figure 3 This is a simulation diagram of the measured data of the spectrum template of the electromagnetic control equipment of the electromagnetic suppression maximum distance prediction method provided by the present invention. The spectrum template of the electromagnetic control equipment is the normalized power spectrum density of the transmitted signal, which describes the distribution of signal power with frequency. Figure 3 It reflects the characteristics of the RF bandpass filter when the electromagnetic control equipment transmits signals.

[0090] Figure 4 The target radio station receiving spectrum template simulation diagram of the electromagnetic suppression maximum distance prediction method provided by the present invention reflects the characteristics of the radio band pass filter when the target radio station receives the signal. According to the provisions of ITU-R M.478.5 Recommendation on the technical characteristics and channel division principles of land mobile service equipment in the frequency band of 25MHz to 3GHz, the passband range of the filter is about ±8kHz, and the attenuation requirement for out-of-band signals is 70dB.

[0091] Step S202: According to the target station working bandwidth B, the receiver noise factor NF, the harmful interference coefficient α, the receiving antenna gain pattern G r (θ), calculate the minimum harmful interference power I of the target station min ;

[0092] Specifically, the minimum harmful interference power I min It refers to the power value of the minimum signal that is subject to harmful interference when the target radio station is at the lowest power that can work normally. The minimum harmful interference power I of the target radio station at the antenna port is min The calculation method is:

[0093] I min =S-PR+α-G r (θ i )

[0094] Among them, S is the demodulation receiving sensitivity of the target radio station, PR is the radio frequency protection ratio, and the demodulation receiving sensitivity S and radio frequency protection ratio PR of the target radio station are obtained by obtaining the spectrum characteristic parameters of the suppressed target radio station, α is the harmful interference coefficient (generally 6dB), G r (θ i ) is the receiving antenna gain of the target station in the interference path direction. The receiving antenna gain of the target station in the interference path direction is obtained by finding the receiving antenna gain pattern G r (θ) i The corresponding value is obtained, θ i is the interference azimuth, that is, the clockwise angle between true north and the interference path.

[0095] According to the demodulation receiving sensitivity S and the background noise N floor The relationship is:

[0096] S=N floor +PR

[0097] Where N floor is the target radio station background noise, which is mainly determined by the thermal noise and noise coefficient generated by the thermal motion of charged particles. The specific calculation is as follows:

[0098] N floor =10·log(KTB)+NF

[0099] Where K is the Boltzmann constant (1.38×10 -23 ), T is the target station's normal temperature in Kelvin (300°), B is the target station's operating bandwidth, and NF is the noise factor;

[0100] It can be obtained that, in general, the calculation method of the minimum harmful interference power of the target radio station at the antenna port is as follows:

[0101] I min =10·lg(KTB)+NF+α-G r (θ i )

[0102] Where lg(·) is a logarithmic function with base 10, K is the Boltzmann constant, T is the Kelvin temperature at room temperature, B is the target radio operating bandwidth, G r (θ i ) is the receiving antenna gain of the target station in the interference path direction, and the receiving antenna gain of the target station in the interference path direction is obtained by finding the receiving antenna gain pattern G r (θ)i The corresponding value is obtained, θ i is the interference path azimuth, that is, the clockwise angle between the true north and the suppression path, see Figure 1 .

[0103] Step S203: According to the transmission power spectrum density P i (f), the received spectrum template |H(f)| 2 、The working center frequency f of the electromagnetic control equipment i , the target radio station operating center frequency f c , the frequency suppression factor FDR is calculated using the following formula;

[0104] Specifically, the frequency suppression factor FDR describes the normalized interference amount of the radio signal emitted by the electromagnetic control equipment with a certain transmission power spectrum density characteristic in the frequency domain entering the working channel of the target radio station. The specific calculation method is as follows:

[0105]

[0106] Among them, △f is the working center frequency f of the electromagnetic control equipment i The target radio station's operating center frequency f c The difference between i -f c .

[0107] Step S204: According to the transmitting antenna gain pattern G i (θ), the transmission power spectrum density P i (f) Use the following formula to calculate the interference equivalent radiated power I e.i.r.p ;

[0108] I e.i.r.p =P i +G i (θ i ')

[0109] Among them, P i is the transmission power of the electromagnetic control equipment, which is calculated by the following formula:

[0110] P i =10·lg(∫P i (f)df)

[0111] Among them, G i (θ i ') is the transmitting antenna gain of the electromagnetic control equipment in the interference path direction, and the transmitting antenna gain of the electromagnetic control equipment in the interference path direction is obtained by finding the transmitting antenna gain pattern G i (θ) i'The corresponding value is obtained, θ i ' is the interference azimuth, that is, the clockwise angle between the true north and the interference path, and θ i '=θ i +180, see Figure 1 .

[0112] Step S205: According to the receiving antenna gain G r (θ i ), the target radio station working bandwidth B, the electromagnetic control equipment working center frequency f i , the receiver noise factor NF, the harmful interference coefficient α, the frequency suppression factor FDR, the minimum harmful interference power I min , the interference equivalent radiated power I e.i.r.p , the effective height of the receiving antenna h r , the transmitting antenna effective height h i Calculate, predict and output the maximum electromagnetic suppression distance d max .

[0113] In order to better play the electromagnetic suppression role of electromagnetic control equipment, it is generally set up at a higher terrain to form line-of-sight propagation, so as to minimize the impact of electromagnetic suppression path loss. Therefore, the electromagnetic suppression path loss is calculated using the free space propagation loss method. The equivalent radiated power of the minimum effective electromagnetic suppression suffered by the target radio station can be calculated as follows:

[0114] Specifically, according to the interference equivalent radiated power variable I e.i.r.p An equation can be established to calculate the maximum distance of electromagnetic suppression and the interference equivalent radiation power variable I e.i.r.p Another way to calculate is as follows:

[0115] I e.i.r.p =I min +32.4+20·lg(f i )+20·lg(d p )+FDR

[0116] The electromagnetic suppression path distance d can be obtained p The calculation formula is:

[0117]

[0118] For long-distance wireless communication, the factor of blocking the propagation of radio waves caused by the curvature of the earth's spherical surface must be considered. los The calculation method is:

[0119]

[0120] Among them, h i and h r The transmitting antenna of the electromagnetic control equipment and the receiving antenna of the target radio station are respectively raised. In order to eliminate the influence of ground objects such as buildings and vegetation, h is generally i and h r Use the effective antenna height, which is the antenna height minus the average height of the surrounding objects (such as buildings, vegetation, walls, etc.); K e is the equivalent earth radius coefficient. Under the general standard atmospheric refraction condition, K e =4 / 3. Equivalent Earth radius coefficient K e It is mainly used to eliminate the influence of radio waves propagating in the atmosphere, which bends toward the ground due to the atmospheric refraction effect instead of propagating in a straight line, which is equivalent to expanding the radius of the earth by 4 / 3 times.

[0121] Finally, according to the smooth earth spherical line of sight distance d los , the electromagnetic suppression path distance d p , use the following formula to calculate the maximum electromagnetic suppression distance d max :

[0122] d max =min{d los ,d p} / K e

[0123] Among them, min{d los ,d p} means taking d los and d p The minimum of two values.

[0124] Figure 5 This is an analysis diagram of the same-frequency suppression situation of the target radio station of the electromagnetic suppression maximum distance prediction method provided by the present invention. Figure 5 The frequency response characteristics of the electromagnetic control equipment and the target radio station were analyzed. It was found that the electromagnetic control equipment has the best suppression effect on the target radio station when the center frequency (441.14 MHz) and bandwidth (about 16 kHz) are the same.

[0125] Figure 6 The relationship analysis diagram between the maximum electromagnetic suppression distance and transmission power of the target radio station of the electromagnetic suppression maximum distance prediction method provided by the present invention is as follows. The transmission power parameters of the electromagnetic control equipment are changed, and the transmission power is set to 50W, 100W, 200W, 300W, 400W, and 500W respectively. The maximum electromagnetic suppression distance of the walkie-talkie remains unchanged, which is 23.3km.

[0126] Figure 7The relationship analysis diagram of the maximum electromagnetic suppression distance of the target radio station and the transmitting antenna height of the electromagnetic suppression maximum distance prediction method provided by the present invention is obtained by changing the transmitting antenna height parameters of the electromagnetic control equipment to set the transmitting antenna heights to 5m, 10m, 20m, 30m, 40m, 60m, 80m and 100m respectively. The corresponding maximum electromagnetic suppression distances are 4.4km, 8.2km, 12.7km, 16.1km, 18.8km, 23.3km, 27.1km and 30.4km respectively.

[0127] pass Figure 6 and Figure 7 The simulation shows that the power loss of radio wave propagation caused by the curvature of the earth's spherical surface is one of the main factors affecting the maximum distance of electromagnetic suppression. Increasing the transmission power does not necessarily increase the maximum distance of electromagnetic suppression. In practical applications, it is also necessary to consider raising the transmitting antenna of electromagnetic control equipment as high as possible to effectively increase the electromagnetic control area.

[0128] Figure 8 The schematic diagram of the electromagnetic suppression maximum distance prediction device provided by the present invention is as follows Figure 8 As shown, the electromagnetic suppression maximum distance prediction device 800 provided in this embodiment includes:

[0129] The acquisition module 801 is used to execute step S201: obtain the spectrum characteristic parameters of the electromagnetic control equipment and the spectrum characteristic parameters of the suppressed target radio station, wherein the spectrum characteristic parameters of the electromagnetic control equipment include: the transmission power spectrum density P i (f), electromagnetic control equipment working center frequency f i , Transmitting antenna gain pattern G i (θ), effective height of transmitting antenna h i The spectrum characteristic parameters of the suppressed target radio station include: the target radio station working center frequency f c , target radio station operating bandwidth B, receiving antenna gain pattern G r (θ), receiver noise factor NF, receiving antenna effective height h r , received spectrum template |H(f)| 2 , harmful interference coefficient α;

[0130] The calculation module 802 is used to execute step S202: according to the target station working bandwidth B, the receiver noise factor NF, the harmful interference coefficient α, the receiving antenna gain pattern G r (θ), calculate the minimum harmful interference power I min ;

[0131] The calculation module 802 is further used to execute step S203: according to the transmit power spectrum density P i(f), the received spectrum template |H(f)| 2 、The working center frequency f of the electromagnetic control equipment i , the target radio station operating center frequency f c , calculate the frequency suppression factor FDR;

[0132] The calculation module 802 is further used to execute step S204: according to the transmit antenna gain pattern G i (θ), the transmission power spectrum density P i (f), calculate the interference equivalent radiated power I e.i.r.p ;

[0133] The calculation module 802 is further used to execute step S205: according to the receiving antenna gain G r (θ i ), the target radio station working bandwidth B, the electromagnetic control equipment working center frequency f i , the receiver noise factor NF, the harmful interference coefficient α, the frequency suppression factor FDR, the minimum harmful interference power I min , the interference equivalent radiated power I e.i.r.p , the effective height of the receiving antenna h r , the transmitting antenna effective height h i Calculate, predict and output the maximum electromagnetic suppression distance d max ;

[0134] Output module 803, used to execute step S205: output the maximum electromagnetic suppression distance d max .

[0135] Optionally, the calculation module 802 is specifically configured to calculate the target radio station operating bandwidth B, the receiver noise factor NF, the harmful interference coefficient α, the receiving antenna gain pattern G r (θ), the minimum harmful interference power I is calculated using the following formula: min :

[0136] I min =10·lg(KTB)+NF+α-G r (θ i )

[0137] Where lg(·) represents the logarithmic function with base 10, K is the Boltzmann constant, T is the room temperature Kelvin, G r (θ i ) is the receiving antenna gain of the target station in the interference path direction, and the receiving antenna gain of the target station in the interference path direction is obtained by finding the receiving antenna gain pattern G r (θ)i The corresponding value is obtained, θ i is the interference azimuth, that is, the clockwise angle between true north and the interference path.

[0138] Optionally, the calculation module 802 is specifically configured to calculate the transmission power spectrum density P according to the transmission power spectrum density P i (f), the received spectrum template |H(f)| 2 、The working center frequency f of the electromagnetic control equipment i , the target radio station operating center frequency f c , the frequency suppression factor FDR is calculated using the following formula:

[0139]

[0140] Wherein, △f is the working center frequency f of the electromagnetic control equipment i The target radio station operating center frequency f c The difference between i -f c .

[0141] Optionally, the calculation module 802 is specifically configured to calculate the transmission antenna gain pattern G according to the transmission antenna gain pattern G i (θ), the transmission power spectrum density P i (f), the interference equivalent radiated power I is calculated using the following formula: e.i.r.p :

[0142] I e.i.r.p =P i +G i (θ i ')

[0143] Among them, P i is the transmitting power of electromagnetic control equipment, P i =10·lg(∫P i (f)df),G i (θ i ') is the transmitting antenna gain in the interference path direction of the electromagnetic control equipment, and the transmitting antenna gain in the interference path direction of the electromagnetic control equipment is obtained by finding the transmitting antenna gain pattern G i (θ) i 'The corresponding value is obtained, θ i ' is the interference azimuth, that is, the clockwise angle between the true north and the interference path, and θ i '=θ i +180.

[0144] Optionally, the calculation module 802 is specifically configured to calculate the gain of the receiving antenna G according to the receiving antenna gain G r (θ i), the target radio station working bandwidth B, the electromagnetic control equipment working center frequency f i , the receiver noise factor NF, the harmful interference coefficient α, the frequency suppression factor FDR, the minimum harmful interference power I min , the interference equivalent radiated power I e.i.r.p , the electromagnetic suppression path distance d is calculated by the following formula p :

[0145]

[0146] Optionally, the calculation module 802 is specifically configured to calculate the effective height h of the transmitting antenna according to the i and the effective height of the receiving antenna h r , use the following formula to calculate the smooth earth spherical line of sight distance d los :

[0147]

[0148] Optionally, the calculation module 802 is specifically configured to calculate the smooth earth spherical surface line of sight distance d los and the electromagnetic suppression path distance d p , use the following formula to calculate the maximum electromagnetic suppression distance d max :

[0149] d max =min{d los ,d p} / K e

[0150] Among them, min{d los ,d p} means taking d los and d p The minimum of the two values, K e is the equivalent earth radius coefficient, K e =4 / 3.

[0151] Fig. 9 A schematic diagram of the electromagnetic suppression maximum distance prediction device provided by the present invention, such as Fig. 9 As shown, the electromagnetic suppression maximum distance prediction device 900 provided in this embodiment includes:

[0152] Memory 902;

[0153] Processor 901;

[0154] Wherein, the memory 902 stores computer-executable instructions;

[0155] The processor 901 executes the computer-executable instructions stored in the memory to implement various possible electromagnetic suppression maximum distance prediction methods in the above embodiments.

[0156] The present invention also provides a computer storage medium, in which computer execution instructions are stored. When the computer execution instructions are executed by a processor, they are used to implement various possible electromagnetic suppression maximum distance prediction methods as described in the above embodiments.

[0157] It will be appreciated by those skilled in the art that all or some of the steps, systems, and functional modules / units in the methods disclosed above may be implemented as software, firmware, hardware, and appropriate combinations thereof. In hardware implementations, the division between the functional modules / units mentioned in the above description does not necessarily correspond to the division of physical components; for example, a physical component may have multiple functions, or a function or step may be performed by several physical components in cooperation. Some or all physical components may be implemented as software executed by a processor, such as a central processing unit, a digital signal processor, or a microprocessor, or implemented as hardware, or implemented as an integrated circuit, such as an application-specific integrated circuit. Such software may be distributed on a computer-readable medium, which may include a computer storage medium (or non-transitory medium) and a communication medium (or temporary medium). As known to those skilled in the art, the term computer storage medium includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data). Computer storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tapes, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store the desired information and can be accessed by a computer. In addition, it is well known to those of ordinary skill in the art that communication media typically contain computer-readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media.

[0158] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and practicing the invention disclosed herein. The present invention is intended to cover any variations, uses or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art that are not disclosed by the present invention. The description and examples are to be considered exemplary only, and the true scope and spirit of the present invention is indicated by the following claims.

[0159] It should be understood that the present invention is not limited to the exact construction that has been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A method for predicting the maximum distance of electromagnetic suppression, characterized in that: The method comprises: Step S201: Acquire the spectrum characteristic parameters of the electromagnetic control equipment and the spectrum characteristic parameters of the suppressed target radio station, wherein the spectrum characteristic parameters of the electromagnetic control equipment include: the transmission power spectrum density P i (f), electromagnetic control equipment working center frequency f i , Transmitting antenna gain pattern G i (θ), effective height of transmitting antenna h i The suppressed target radio station spectrum characteristic parameters include: the target radio station working center frequency f c , target radio station operating bandwidth B, receiving antenna gain pattern G r (θ), receiver noise factor NF, receiving antenna effective height h r , received spectrum template |H(f)| 2 , harmful interference coefficient α; Step S202: According to the target station working bandwidth B, the receiver noise factor NF, the harmful interference coefficient α, the receiving antenna gain pattern G r (θ), calculate the minimum harmful interference power I received by the target station min ; Step S203: According to the transmission power spectrum density P i (f), the received spectrum template |H(f)| 2 、The working center frequency f of the electromagnetic control equipment i , the target radio station operating center frequency f c , calculate the frequency suppression factor FDR; Step S204: According to the transmitting antenna gain pattern G i (θ), the transmission power spectrum density P i (f), calculate the interference equivalent radiated power I e.i.r.p ; Step S205: According to the receiving antenna gain G r (θ i ), the target radio station working bandwidth B, the electromagnetic control equipment working center frequency f i , the receiver noise factor NF, the harmful interference coefficient α, the frequency suppression factor FDR, the minimum harmful interference power I min , the interference equivalent radiated power I e.i.r.p , the effective height of the receiving antenna h r , the transmitting antenna effective height h i Calculate, predict and output the maximum electromagnetic suppression distance d max .

2. The electromagnetic suppression maximum distance prediction method according to claim 1, characterized in that: The step S202 includes: According to the target radio station operating bandwidth B, the receiver noise factor NF, the harmful interference coefficient α, the receiving antenna gain pattern G r (θ), the following formula is used to calculate the minimum harmful interference power I received by the target station: min : I min =10·lg(KTB)+NF+α-G r (i i ) Where lg(·) represents the logarithmic function with base 10, K is the Boltzmann constant, T is the room temperature Kelvin, G r (θ i ) is the receiving antenna gain of the target station in the interference path direction, and the receiving antenna gain of the target station in the interference path direction is obtained by finding the receiving antenna gain pattern G r (θ) i The corresponding value is obtained, θ i is the interference azimuth, that is, the clockwise angle between true north and the interference path.

3. The electromagnetic suppression maximum distance prediction method according to claim 1, characterized in that: The step S203 includes: According to the transmission power spectrum density P i (f), the received spectrum template |H(f)| 2 、The working center frequency f of the electromagnetic control equipment i , the target radio station operating center frequency f c , the frequency suppression factor FDR is calculated using the following formula: Among them, △f is the working center frequency f of the electromagnetic control equipment i The target radio station's operating center frequency f c The difference between i -f c .

4. The electromagnetic suppression maximum distance prediction method according to claim 1, characterized in that: The step S204 includes: According to the transmitting antenna gain pattern G i (θ), the transmission power spectrum density P i (f) Use the following formula to calculate the interference equivalent radiated power I e.i.r.p : I e.i.r.p =P i +G i (θ i ') Among them, P i is the transmitting power of electromagnetic control equipment, P i =10·lg(∫P i (f)df),G i (θ i ') is the transmitting antenna gain in the interference path direction of the electromagnetic control equipment, and the transmitting antenna gain in the interference path direction of the electromagnetic control equipment is obtained by finding the transmitting antenna gain pattern G i (θ) i 'The corresponding value is obtained, θ i ' is the interference azimuth, that is, the clockwise angle between the true north and the interference path, and θ i '=θ i +180.

5. The electromagnetic suppression maximum distance prediction method according to claim 1, characterized in that: The step S205 includes: According to the receiving antenna gain G r (θ i ), the target radio station working bandwidth B, the electromagnetic control equipment working center frequency f i , the receiver noise factor NF, the harmful interference coefficient α, the frequency suppression factor FDR, the minimum harmful interference power I min , the interference equivalent radiated power I e.i.r.p , the effective height of the receiving antenna h r , the transmitting antenna effective height h i , calculate the electromagnetic suppression path distance d p The apparent distance d from the smooth earth surface los ; According to the smooth earth spherical visual distance d los and the electromagnetic suppression path distance d p , calculate the maximum electromagnetic suppression distance d max .

6. The electromagnetic suppression maximum distance prediction method according to claim 5, characterized in that: According to the receiving antenna gain G r (θ i ), the target radio station working bandwidth B, the electromagnetic control equipment working center frequency f i , the receiver noise factor NF, the harmful interference coefficient α, the frequency suppression factor FDR, the minimum harmful interference power I min , the interference equivalent radiated power I e.i.r.p , the effective height of the receiving antenna h r , the transmitting antenna effective height h i , calculate the electromagnetic suppression path distance d p The apparent distance d from the smooth earth surface los ,include: According to the receiving antenna gain G r (θ i ), the target radio station working bandwidth B, the electromagnetic control equipment working center frequency f i , the receiver noise factor NF, the harmful interference coefficient α, the frequency suppression factor FDR, the minimum harmful interference power I min , the interference equivalent radiated power I e.i.r.p , the electromagnetic suppression path distance d is calculated by the following formula p : According to the effective height h of the transmitting antenna i and the effective height of the receiving antenna h r , use the following formula to calculate the smooth earth spherical line of sight distance d los :

7. The electromagnetic suppression maximum distance prediction method according to claim 5, characterized in that: The smooth earth spherical surface line of sight distance d los and the electromagnetic suppression path distance d p , calculate the maximum electromagnetic suppression distance d max ,include: According to the smooth earth spherical visual distance d los and the electromagnetic suppression path distance d p , use the following formula to calculate the maximum electromagnetic suppression distance d max : the max =min{d los ,d p } / K e Among them, min{d los ,d p } means taking d los and d p The minimum of the two values, K e is the equivalent earth radius coefficient, K e =4 / 3.

8. An electromagnetic suppression maximum distance prediction device, characterized in that: The device is applied to the electromagnetic suppression maximum distance prediction method according to any one of claims 1 to 7, comprising: The acquisition module is used to execute step S201: obtain the spectrum characteristic parameters of the electromagnetic control equipment and the spectrum characteristic parameters of the suppressed target radio station, wherein the spectrum characteristic parameters of the electromagnetic control equipment include: the transmission power spectrum density P i (f), electromagnetic control equipment working center frequency f i , Transmitting antenna gain pattern G i (θ), effective height of transmitting antenna h i The suppressed target radio station spectrum characteristic parameters include: the target radio station working center frequency f c , target radio station operating bandwidth B, receiving antenna gain pattern G r (θ), receiver noise factor NF, receiving antenna effective height h r , received spectrum template |H(f)| 2 , harmful interference coefficient α; The calculation module is used to execute step S202: according to the target station working bandwidth B, the receiver noise factor NF, the harmful interference coefficient α, the receiving antenna gain pattern G r (θ), calculate the minimum harmful interference power I of the target station min ; The calculation module is further used to execute step S203: according to the transmit power spectrum density P i (f), the received spectrum template |H(f)| 2 、The working center frequency f of the electromagnetic control equipment i , the target radio station operating center frequency f c , calculate the frequency suppression factor FDR; The calculation module is further used to execute step S204: according to the transmit antenna gain pattern G i (θ), the transmission power spectrum density P i (f), calculate the interference equivalent radiated power I e.i.r.p ; The calculation module is further used to execute step S205: according to the receiving antenna gain G r (θ i ), the target radio station working bandwidth B, the electromagnetic control equipment working center frequency f i , the receiver noise factor NF, the harmful interference coefficient α, the frequency suppression factor FDR, the minimum harmful interference power I min , the interference equivalent radiated power I e.i.r.p , the effective height of the receiving antenna h r , the transmitting antenna effective height h i Calculate, predict and output the maximum electromagnetic suppression distance d max ; Output module, the output module is used to execute step S205: output the maximum electromagnetic suppression distance d max .

9. An electromagnetic suppression maximum distance prediction device, characterized in that: include: Memory; processor; Wherein, the memory stores computer-executable instructions; The processor executes the computer-executable instructions stored in the memory to implement the electromagnetic suppression maximum distance prediction method according to any one of claims 1 to 7.

10. A computer storage medium, characterized in that: The computer storage medium stores computer execution instructions, which, when executed by a processor, are used to implement the electromagnetic suppression maximum distance prediction method according to any one of claims 1 to 7.

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