A Grid-Based Suppression Area Calculation Method for Directed Communication Interference

Abstract

The present invention discloses a grid-based method for calculating the suppression area against directed communication interference. First, calculate the initial parameters, which include communication frequency, output power of the communication transmitter, gain of the communication transmitting antenna, gain of the communication interference antenna varying with azimuth, output power of the communication interference transmitter, communication interference suppression coefficient, position of the communication jammer, position of the communication transmitter, position of the communication receiver, and central coordinates of the interference area. Divide the calculation grid along the azimuth and distance around the communication jammer, and initialize the azimuth angle and distance step size. Second, traverse the entire azimuth plane of the directed communication interference antenna beam with the azimuth angle step size, calculate the interference suppression situation, and step forward with the distance step size to calculate the communication interference suppression situation within the range from 0 to the line-of-sight distance d, so as to obtain the shape of the communication interference suppression area. The present invention can obtain the shape of the communication interference suppression area under the condition of directed communication interference.

Description

Technical Field

[0001] The present invention belongs to the technical field of communication countermeasures, and particularly relates to a grid-based suppression area calculation method for directed communication interference. Background Art

[0002] For wireless communication systems, wireless communication interference technology is becoming more and more advanced, and its interference antennas are developing in the directed direction to achieve the purposes of concentrating interference power and reducing internal mutual interference. To improve the anti-interference ability of communication technology, it is necessary to deeply study the shape of the communication interference suppression area under the condition of directed communication interference. Existing textbooks and public materials only calculate the shape of the communication interference suppression area for omnidirectional communication interference antennas, and there is still a lack of research on the shape of the suppression area for directed communication interference. Summary of the Invention

[0003] In view of this, the present invention provides a grid-based suppression area calculation method for directed communication interference, which can obtain the shape of the communication interference suppression area under the condition of directed communication interference.

[0004] The technical solution of the present invention is implemented as follows:

[0005] A grid-based suppression area calculation method for directed communication interference includes the following steps:

[0006] Step 1: Initialize calculation parameters, where the calculation parameters include communication frequency, communication transmitter output power, communication transmitting antenna gain, communication interference antenna gain varying with azimuth, communication interference transmitter output power, communication interference suppression coefficient, communication jammer position, communication transmitter position, communication receiver position, and interference region center coordinates; divide the calculation grid along azimuth and distance around the communication jammer, and initialize the azimuth angle and distance step size;

[0007] Step 2: Traverse the entire azimuth plane of the directed communication interference antenna beam at the azimuth angle step size, calculate the interference suppression situation, and step forward at the distance step size to calculate the communication interference suppression situation within the range from 0 to the line-of-sight distance d, so as to obtain the shape of the communication interference suppression area.

[0008] Further, in Step 2, the specific process of traversing the azimuth angle to calculate the interference suppression situation is as follows:

[0009] For a certain azimuth angle, calculate the effective radiated power of the communication jammer in the direction of this azimuth angle.

[0010] Further, in Step 2, the specific process of traversing the distance step size to calculate the communication interference suppression situation within the range from 0 to the line-of-sight distance d is as follows:

[0011] Step a: Calculate the power of the communication transmitter received by the communication receiver;

[0012] Step b: Calculate the power of the communication jammer received by the communication receiver;

[0013] Step c: Calculate the ratio of the power of the interference signal to the power of the communication signal received by the communication receiver, i.e., the interference-to-signal ratio;

[0014] Step d: Mark the interference suppression area or the interference exposure area: If the interference-to-signal ratio is greater than the communication interference suppression coefficient, it is the interference suppression area; otherwise, it is the interference exposure area.

[0015] Furthermore, adjust the calculation parameters and observe the change of the shape of the communication interference suppression area with different calculation parameters. Description of the Drawings

[0016] Figure 1 It is a flowchart for calculating the suppression area of grid-based directed communication interference.

[0017] Figure 2 It is a deployment relationship diagram (horizontal plane) of the communication transceiver and the communication jammer.

[0018] Figure 3 It is an example of the beam direction pattern of the communication interference antenna.

[0019] Figure 4 It is a certain basic figure.

[0020] Figure 5 It is based on Figure 4 On this basis, the figure obtained by increasing the effective radiated power of the communication jammer to twice the original.

[0021] Figure 6 It is based on Figure 4 On this basis, the figure obtained by increasing the effective radiated power of the communication jammer to three times the original.

[0022] Figure 7 It is a certain basic figure.

[0023] Figure 8 It is based on Figure 7 On this basis, the figure obtained by increasing the effective radiated power of the communication jammer to twice the original.

[0024] Figure 9 It is based on Figure 7 On this basis, the figure obtained by increasing the effective radiated power of the communication jammer to three times the original. Detailed Implementation Manner

[0025] The present invention will be described in detail below with reference to the accompanying drawings and by way of examples.

[0026] The present invention provides a grid-based method for calculating the suppression area against directed communication interference. This method takes the effective radiated power of communication interference, the directional pattern of the directed communication interference antenna, the parameters of the communication transceiver, the interference distance, the communication distance, the communication interference suppression coefficient, and the pointing direction of the communication interference beam as inputs, and the output is the shape graph of the interference suppression area.

[0027] When the heights of the communication jammer and the communication transceiver are not very large compared with the communication distance and the interference distance, it can be considered that the communication transmission, communication reception, and communication interference are all in the same horizontal plane. The calculation process of the horizontal plane interference suppression area shape is as follows (see Figure 1 ):

[0028] Step 1: Initialize the calculation parameters. The calculation parameters include communication frequency, communication transmitter output power, communication transmitting antenna gain, communication interference antenna gain varying with azimuth, communication interference transmitter output power, communication interference suppression coefficient, communication jammer position (including height), communication transmitter position (including height), communication receiver position (including height), and the center coordinates of the interference area (the line connecting the communication jammer to this point represents the interference beam pointing direction); around the communication jammer, divide the calculation grid along azimuth and distance, and initialize the azimuth angle and distance step size.

[0029] Calculate the radio line-of-sight range between the communication jammer and the communication receiver according to formula (1).

[0030]

[0031] In the formula,

[0032] d —— line-of-sight distance, km;

[0033] h1 —— height of the communication interference antenna (i.e., the height of the communication jammer), m;

[0034] h R —— height of the communication receiving antenna (i.e., the height of the communication receiver), m.

[0035] Step 2: Calculate the interference suppression area according to the grid.

[0036] Traverse the entire azimuth plane of the directed communication interference antenna beam with the azimuth angle step size, calculate the interference suppression situation. For a given azimuth angle, calculate the effective radiated power of the communication jammer in this angular direction according to formula (2):

[0037] P(α) = P t G t (2)

[0038] In the formula,

[0039] P(α) —— effective radiated power of the communication jammer at azimuth α, W;

[0040] P t —— Output power of the communication interference transmitter. For an array antenna, its value is the product of the unit power amplifier and the number of units, W;

[0041] G t —— Gain of the communication interference antenna.

[0042] Step by step according to the distance step, calculate the communication interference suppression situation within the range from 0 to the line-of-sight distance d, so as to obtain the shape of the communication interference suppression area. Specifically:

[0043] Step a: Calculate the power of the communication transmitter received by the communication receiver;

[0044] First, calculate the line-of-sight distance from the communication transmitter to the communication receiver and the Fresnel zone distance from the communication transmitter to the communication receiver. If the line-of-sight distance is not less than the Fresnel zone distance, use the two-line loss and Egli empirical formula to calculate the power of the communication transmitter received by the communication receiver; otherwise, use the free space propagation loss formula to calculate.

[0045] The calculation method of the Fresnel zone distance is shown in formula (3):

[0046] FZ = [h T ×h R ×f] / 24000 (3)

[0047] In the formula,

[0048] FZ——Fresnel zone distance, km;

[0049] h T —— Height of the communication transmitting antenna (i.e., the height of the communication transmitter), m;

[0050] h R —— Height of the communication receiving antenna, m;

[0051] f——Communication frequency, MHz.

[0052] The Egli empirical formula is as follows:

[0053]

[0054] In the formula,

[0055] P r —— Power of the communication transmitter received by the communication receiver, w;

[0056] f——Communication frequency, MHz;

[0057] h t —— Height of the communication transmitting antenna, m;

[0058] h r —— Height of the communication receiving antenna, m;

[0059] P t —— Output power of the communication transmitter, w;

[0060] G tr —— Gain of the communication transmitting antenna in the direction of the communication receiver;

[0061] G rt —— Gain of the communication receiving antenna in the direction of the communication transmitter;

[0062] d tr —— Distance between the communication transmitter and the communication receiver, m;

[0063] L - Other losses, in positive decibels.

[0064] Scope of application: 1 km < dtr < 50 km; 30 MHz < f < 1 GHz.

[0065] The standard deviation of the communication received signal power will vary with frequency, and there is the following empirical formula:

[0066] σ = 5lg f + 2 dB, where the unit of f is MHz. The range of the standard deviation is approximately between 9 dB and 12 dB, and it increases with the increase of frequency.

[0067] The calculation method of free space propagation loss is shown in formula (5):

[0068] L = (4 × π) 2 d 2 / λ 2 (5)

[0069] In the formula,

[0070] L - Free space propagation loss;

[0071] d - Line-of-sight distance;

[0072] λ - Wavelength of the transmitted signal.

[0073] The unit of the link distance is the same as that of the transmitted signal wavelength.

[0074] The calculation method of the two-wire loss is shown in formula (6):

[0075]

[0076] In the formula,

[0077] d - Line-of-sight distance;

[0078] h T —— Height of the communication transmitting antenna;

[0079] h R —— Height of the communication receiving antenna.

[0080] The line-of-sight distance and the antenna height have the same unit.

[0081] If the communication receiving power is not lower than the sensitivity of the communication receiver, mark this point at the position of the communication receiver with a corresponding color (such as blue), indicating the communication unobstructed area under the condition of no interference.

[0082] Step b: Calculate the power of the communication jammer received by the communication receiver; consider the Fresnel zone problem by a similar method as described above.

[0083] Step c: Calculate the ratio of the power of the interference signal received by the communication receiver to the power of the communication signal, that is, the interference-to-signal ratio.

[0084] Step d: Mark the interference suppression area or the interference exposure area: If the interference-to-signal ratio is greater than the communication interference suppression coefficient, it is the interference suppression area and is marked with a corresponding color (such as red), otherwise it is the interference exposure area.

[0085] Adjust the relevant parameters and observe the shape of the communication interference suppression area. The communication frequency, the output power of the communication transmitter, the gain of the communication transmitting antenna, the beam gain of the communication interference antenna varying with azimuth, the output power of the communication jammer, the communication interference suppression coefficient, the position (including height) of the communication jammer, the position (including height) of the communication transmitter, the central coordinates of the interference area, the number of simultaneous interfering frequencies, etc. can be adjusted. Repeat the calculations in the first and second steps and observe the shape of the communication interference suppression area and its changes with different calculation parameters.

[0086] (1) When both the communication jammer and the communication use horizontal omnidirectional antennas, the communication interference suppression area is a regular shape.

[0087] In the case where both the communication interference antenna and the communication antenna are omnidirectional, the communication jammer is always in the interference suppression area, and the area around the communication transmitter is always the communication unobstructed area. If interference is dominant, the interference suppression area expands to the area around the communication transmitter, and the communication unobstructed area is a circle around the communication transmitter; if communication and interference are comparable, the interference suppression area is on one side of the communication jammer and the communication unobstructed area is on one side of the communication transmitter; if communication is dominant, the interference suppression area is compressed to the area around the communication jammer, and the communication interference suppression area is a circle around the communication jammer.

[0088] (2) When the communication interference is directional and the communication is omnidirectional, the communication interference suppression area becomes irregular.

[0089] When the direction of communication interference points towards the direction of the communication transmitter, if the interference is dominant, then in the direction pointed by the interference beam, within the azimuth range slightly larger than the interference beam width, there is a certain communication unobstructed area around the communication transmitter, and the rest of the area is the interference suppression area; if the communication and interference are comparable or the communication is dominant, then in the direction pointed by the interference beam, within the azimuth range slightly larger than the interference beam width, the communication unobstructed area cuts off the interference suppression area. When the direction of communication interference deviates from the direction of the communication transmitter, on the side of the communication transmitter close to the direction pointed by the interference beam, a certain communication unobstructed area is formed, and on the other side, it is all communication unobstructed area.

[0090] These characteristics can strongly guide the design and application of communication jamming and anti-jamming equipment.

[0091] The following is an example calculation according to the above method.

[0092] (1) First, give the description of the figure

[0093] The distance calculation involves Figures 2 to 9 , where:

[0094] Figure 2 is the deployment relationship diagram (horizontal plane) of the communication transceiver and the communication jammer. Among them, J is the position of the communication jammer; T is the position of the communication transmitter; R is the position of the communication receiver; d is the distance between the communication transmitter and the communication jammer; Dc(xd, yd) is the center coordinate of the interference area.

[0095] Figure 3 is an example of the communication interference antenna beam pattern. It can be the horizontal plane, the vertical plane or any cross-section, and can be the antenna pattern of the scenario, simulation calculation or actual measurement.

[0096] Figure 4 is a basic figure.

[0097] Figure 5 is Figure 4 On the basis of, the figure obtained by increasing the effective radiated power of the communication interference to 2 times the original.

[0098] Figure 6 is Figure 4 On the basis of, the figure obtained by increasing the effective radiated power of the communication interference to 3 times the original.

[0099] Figure 7 is a basic figure.

[0100] Figure 8 is Figure 7 On the basis of, the figure obtained by increasing the effective radiated power of the communication interference to 2 times the original.

[0101] Figure 9 isFigure 7 The figure obtained by increasing the effective radiated power of communication interference to three times the original on the basis of

[0102] (2) Calculate by way of example.

[0103] Assume that the communication (interference) operating frequency is 1000 MHz, the output power of the communication transmitter is 1000 W, the output power of the communication jammer is 15 kW, the gains of the communication transceiver antennas are both 1, the losses of the communication transmitter feeder, etc. and the self-loss of the communication jammer are both 1, and the communication interference suppression coefficient is 1; the sensitivity of the communication receiver is -90 dBm; the communication jammer is located at J(0 km, 0 km), that is Figure 2 at the origin of coordinates shown; the communication transmitter is located at T(250 km, 0 km), that is Figure 2 on the x-axis shown; the communication transceivers and the communication jammer are installed on the aircraft, and the flight altitude of the aircraft is 10,000 m; the beam gain of the communication interference antenna is shown in Figure 3 ; the azimuth step is taken as 0.1°, and the distance step is taken as 5 km. The center of the communication interference area is Dc(200 km, 0 km), that is, in the direction pointing to the communication transmitter. The shape of the interference suppression area is as shown in Figures 4 to 6 the red area. Among them, Figure 4 is the basic shape of the interference suppression area calculated from the above given parameters; Figure 5 is Figure 4 the figure obtained by increasing the effective radiated power of communication interference to twice the original on the basis of Figure 6 is Figure 4 the figure obtained by increasing the effective radiated power of communication interference to three times the original on the basis of

[0104] Set the coordinates of the center of the interference area as Dc(200 km, 50 km), that is, deviate upward by 50 km, and the other parameters remain unchanged. The shape of the interference suppression area becomes Figures 7 to 9 the red area shown. Among them, Figure 7 is the basic figure of the interference suppression area calculated from the above given parameters; Figure 8 is Figure 7 the figure obtained by increasing the effective radiated power of communication interference to twice the original on the basis of Figure 9 is Figure 7 the figure obtained by increasing the effective radiated power of communication interference to three times the original on the basis of

[0105] Beneficial effects:

[0106] The communication interference suppression area calculation method proposed by the present invention takes into account elements such as the effective radiated power of communication interference, the communication interference beam shape, communication terminal parameters, interference distance, communication distance, communication interference suppression coefficient, and communication interference beam pointing, the influence of line-of-sight distance and Fresnel zone, as well as the range of the communication unobstructed area under the condition of no interference.

[0107] In summary, the above are only the preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A grid-based suppression area calculation method for directed communication interference, characterized in that, It includes the following steps: Step 1: Initialize the calculation parameters, which include communication frequency, communication transmitter output power, communication transmitting antenna gain, communication interference antenna gain varying with azimuth, communication interference transmitter output power, communication interference suppression coefficient, communication jammer position, communication transmitter position, communication receiver position, and interference area center coordinates; Divide the calculation grid along the azimuth and distance around the communication jammer, and initialize the azimuth angle and distance step size; Step 2: Traverse the entire azimuth plane of the directed communication interference antenna beam at the azimuth angle step size, calculate the interference suppression situation, and step forward at the distance step size to calculate the communication interference suppression situation within the range from 0 to the line-of-sight distance d, so as to obtain the shape of the communication interference suppression area; The specific process of traversing the azimuth angle to calculate the interference suppression situation is as follows: For a certain azimuth angle, calculate the effective radiation power of the communication jammer in the direction of this azimuth angle; The specific process of traversing the distance step size to calculate the communication interference suppression situation within the range from 0 to the line-of-sight distance d is as follows: Step a: Calculate the power of the communication transmitter received by the communication receiver; Step b: Calculate the power of the communication jammer received by the communication receiver; Step c: Calculate the ratio of the interference signal power to the communication signal power received by the communication receiver, that is, the interference-to-signal ratio; Step d: Mark the interference suppression area or interference exposure area: If the interference-to-signal ratio is greater than the communication interference suppression coefficient, it is the interference suppression area, otherwise it is the interference exposure area.

2. The grid-based suppression area calculation method for directed communication interference according to claim 1, characterized in that, Adjust the calculation parameters and observe the change of the communication interference suppression area shape with different calculation parameters.

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