RU238285U1 - Device for assessing the noise immunity of radio lines - Google Patents

Abstract

The utility model relates to computing technology and can be used for scientific research, which requires evaluating the noise immunity of radio links. The device is intended for direct calculation of the noise immunity index of radio links — the ratio of the interference power to the signal power at the receiver input, as well as for evaluating the obtained index according to the specified criteria. The purpose of creating the utility model is to create a technical means of a specific purpose (calculation of the noise immunity index of radio links — the ratio of the interference power to the signal power at the receiver input, as well as evaluating the obtained index according to the specified criteria). The technical result of this utility model lies in the fact that the implementation and use of this device provides an expansion of the arsenal of means for a specific purpose, allowing to calculate the value of the ratio of the interference power to the signal power at the receiver input and to evaluate the noise immunity of radio links. The presented device can be used: to evaluate fulfillment of the requirements for noise immunity of a radio link with its specified characteristics and the characteristics of interference stations; to determine the maximum required power of a signal transmitter, which ensures the required noise immunity; For selecting transmitter and receiver antennas and their characteristics to ensure the required noise immunity; for determining the size of the zone within which electronic equipment can be suppressed. The presented device is designed for connection to other technical systems or simulation systems due to the presence of data inputs and outputs.

Description

The utility model relates to computing technology and can be used for scientific research that requires assessing the noise immunity of radio lines.

The device is designed for direct calculation of the noise immunity index of radio lines - the ratio of the interference power to the signal power at the receiver input, as well as for evaluating the obtained index according to specified criteria.

A noise-immune radio measuring device is known (Patent of the Russian Federation for Utility Model No. 127481, published on April 27, 2013, Bulletin No. 12). This device makes it possible to restore a weak received signal under the influence of powerful out-of-band interference with the possibility of combining it with a means of protection against in-cavity interference. The device can be implemented as a correlation radiometer that performs the following operations of processing received signals under the influence of out-of-cavity interference: calculating the readings of the correlation function distorted by powerful interference; estimating the instantaneous interference power at the inputs of the low-noise amplifier of the radiometer overloaded with powerful interference; calculating and compensating for the distortions of the correlation function readings caused by the influence of powerful interference. In addition, the device can be implemented as a modulation radiometer that performs the following operations: calculating the signal power at the radiometer input, distorted by the influence of powerful out-of-band interference; Estimation of the instantaneous interference power at the input of a low-noise amplifier of a radiometer overloaded with powerful interference; calculation and compensation of the signal power distortion caused by the interference.

However, this device does not implement the ability to calculate the value of the indicator - the ratio of the interference power to the signal power at the receiver input based on the initial data received at the information inputs, characterizing the parameters of the signal transmitter and receiver, as well as the assessment of this indicator.

The closest analogue (prototype) to the claimed solution in terms of technical implementation and functionality is a device for calculating the interference power at the receiver input (Russian Federation Patent for Utility Model No. 219469, published July 19, 2023, Bulletin No. 20). This device calculates the interference power at the receiver input based on the initial data received at the information inputs, characterizing the parameters of the signal transmitter and receiver.

However, this device does not implement the ability to calculate and evaluate the ratio of the interference power to the signal power at the receiver input.

The purpose of creating a utility model is to create a technical means for a specific purpose (calculating the noise immunity index of radio lines - the ratio of the interference power to the signal power at the receiver input, as well as evaluating the obtained index according to specified criteria).

An analysis of possible indicators of noise immunity in the theory of information transmission under interference conditions shows that, given the random nature of the interference created, it is advisable to use probabilistic indicators to describe them.

Let us consider the probability of receiver suppression as an indicator of noise immunity.

P _sub = P(K≥K _p ),

where K is the ratio of the interference power P _n to the signal power at the receiver input P _c ;

K _p is the maximum permissible value of K, called the suppression coefficient;

P (K≥K _p ) is the probability that K will be greater than or equal to the required K _p to suppress the radio link.

In general, to perform approximate calculations, one can take

P _sub =1, if K≥K _p ;

P _sub =0 if K<K _n .

Thus, the suppression coefficient is the minimum required ratio of the interference power P _n to the signal power P _c at the input of the suppressed receiver within its passband, at which the required degree of suppression is achieved.

Then the determination of _P will be reduced to the calculation of the ratio K and its subsequent comparison with the suppression coefficient, and measures to improve noise immunity will be aimed at reducing K _n .

Along with the suppression coefficient, the coefficient of reliable reception K _n is used to evaluate the required level of noise immunity.

The coefficient of reliable reception K _n is the minimum ratio of the signal power to the interference power at the receiver input, which ensures reliable reception with a given probability.

Using the given coefficients, it is possible to evaluate noise immunity and make certain decisions based on the following criteria:

1) if

then the requirements for interference immunity are met and reliable reception is ensured;

2) if

then unreliable reception is possible and it is necessary to take measures to restore signals received under interference conditions, or switch to other frequencies;

3) if

then the radio line will be completely suppressed and it will be necessary to use a backup or hidden radio data set, or switch to other frequencies.

To determine P _n and P _c, expressions (4) and (5) are used:

where C is a coefficient, the value of which depends on the frequency range of the radio line, the state of the earth's surface, the state of the ionosphere (for the HF range), the type of radio wave with which radio communication is organized (surface or spatial) and the communication range;

λ is the wavelength;

L _p - the distance between the interference transmitter and the signal receiver;

L _min - minimum permissible distance L _p ;

L _max - maximum permissible distance L _p ;

P _per - power supplied to the antenna;

G _per - gain coefficient of the radio signal transmitter antenna in the direction of the receiver;

Р _с - signal power;

Р _п - interference power at the receiver input;

G _pr - antenna gain in the direction of the transmitter;

Δƒ _pr - bandwidth of the linear part of the receiver;

Р _пп - interference power supplied to the antenna;

G _pp - gain coefficient of the radio interference transmitter antenna in the direction of the receiver;

Δƒ _p - interference spectrum width;

L _c - distance between the transmitter and the signal receiver;

To determine K we use relations (4) and (5), as a result we obtain

The operation of the presented utility model is implemented in accordance with expression (6) and criteria (1) - (3).

The figure Fig. 1 shows the structural diagram of the device.

The device comprises a first register 1 intended for recording the value of the interference power supplied to the antenna, a second register 2 intended for recording the value of the gain of the antenna of the radio interference transmitter in the direction of the receiver, a third register 3 intended for recording the value of the bandwidth of the linear part of the receiver, a fourth register 4 intended for recording the value of the distance between the transmitter and the signal receiver, a fifth register 5 intended for recording the value of the power supplied to the antenna, a sixth register 6 intended for recording the value of the gain of the antenna of the radio signal transmitter in the direction of the receiver, a seventh register 7 intended for recording the value of the width of the interference spectrum, an eighth register 8 intended for recording the value of the distance between the interference transmitter and the signal receiver, a ninth register 19 intended for recording the value of the reliable reception coefficient, a tenth register 23 intended for recording the value of the suppression coefficient, first, second, third, fourth, fifth and sixth blocks of AND elements 9, 11, 13, 14, 17, 21, the first and second raising to the second power blocks 10, 12, the first multiplication block 15, intended to obtain the product of the initial data received from the first, second and third registers 1-3, as well as from the first raising to the second power block 10, the second multiplication block 16, intended to obtain the product of the initial data received from the fifth, sixth and seventh registers 5-7, as well as from the second raising to the second power block 12, the division block 18, intended to obtain the quotient of the data received from the first and second multiplication blocks 15, 16, and to directly calculate the ratio of the interference power to the signal power at the receiver input, the first comparator 20, intended to directly compare the value of the ratio of the interference power to the signal power at the receiver input, received from the division block 18 and the value of the reliable reception coefficient received from the ninth register 19, the second a comparator 22 designed to directly compare the value of the ratio of the interference power to the signal power at the receiver input received from the dividing unit 18 through the sixth block of AND elements 21 and the value of the suppression coefficient received from the tenth register 23, a first information input 24 designed to input data on the value of the interference power supplied to the antenna, a second information input 25 designed to input data on the value of the gain of the antenna of the radio interference transmitter in the direction of the receiver, a third information input 26 designed to input data on the value of the bandwidth of the linear part of the receiver, a fourth information input 27 designed to input data on the value of the distance between the transmitter and the receiver of the signal, a fifth information input 28 designed to input data on the value of the power supplied to the antenna, a sixth information input 29 designed to input data on the value of the gain of the antenna of the radio signal transmitter in the direction of the receiver, a seventh information input 30, intended for inputting data on the value of the interference spectrum width, the eighth information input 31, intended for inputting data on the value of the distance between the interference transmitter and the signal receiver, the ninth information input 32, intended for inputting data on the value of the reliable reception coefficient, the tenth information input 33, intended for inputting data on the value of the suppression coefficient, the first information output of the device 34, intended for outputting a single value, in the case when the value of the ratio of the interference power to the signal power at the input of the receiver is less than the value of the reliable reception coefficient, the second information output of the device 35, intended for outputting a single value, in the case when the value of the ratio of the interference power to the signal power at the input of the receiver is greater than the value of the reliable reception coefficient, but less than the value of the suppression coefficient, the third information output of the device 36, intended for outputting a single value, in the case when the value of the ratio of the interference power to the signal power at the input of the receiver is greater than the value of the suppression coefficient.

The first, second, third, fourth, fifth, sixth, seventh, eighth, ninth and tenth information inputs 24-33 are connected to the first, second, third, fourth, fifth, sixth, seventh, eighth, ninth and tenth registers 1-8, 19, 23 respectively, the outputs of the first and second registers 1, 2 are connected to the inputs of the first block of AND elements 9, the output of the fourth register 4 is connected to the input of the first block of raising to the second power 10, the outputs of the third register 3 and the first block of raising to the second power 10 are connected to the third block of AND elements 13, the outputs of the fifth and sixth registers 5, 6 are connected to the inputs of the second block of AND elements 11, the output of the eighth register 8 is connected to the input of the second block of raising to the second power 12, the outputs of the seventh register 7 and the second block of raising to the second power 12 are connected to the fourth block of AND elements 14, the output of the ninth register 19 is connected to the input of the first comparator 20, the output of the tenth register 23 is connected to the input of the second comparator 22, the outputs of the first and third blocks of AND elements 9, 13 are connected to the inputs of the first multiplication block 15, the outputs of the second and fourth blocks of AND elements 11, 14 are connected to the inputs of the second multiplication block 16, the outputs of the first and second multiplication blocks 15, 16 are connected to the inputs of the fifth block of AND elements 17, the outputs of the fifth block of AND elements 17 are connected to the inputs of the division block 18, the output of the division block 18 is connected in parallel to the inputs of the first comparator 20 and the sixth block of AND elements 21, the first output of the first comparator 20 is the first information output of the device 34, the second output of the first comparator 20 is connected to the input of the sixth block of AND elements 21, the output of the sixth block of AND elements 21 is connected to the input of the second comparator 22, the first output of the second comparator 22 is the second information output of the device 35, the second output of the second comparator 22 is the third information output of the device 36.

The device operates as follows. The first, second, third, fourth, fifth, sixth, seventh, eighth, ninth, and tenth information inputs 24-33 receive data on the value of the interference power supplied to the antenna, the gain of the radio interference transmitter antenna in the direction of the receiver, the bandwidth of the linear part of the receiver, the distance between the transmitter and the signal receiver, the power supplied to the antenna, the gain of the radio signal transmitter antenna in the direction of the receiver, the value of the interference spectrum width, the distance between the interference transmitter and the signal receiver, the reliable reception coefficient, and the suppression coefficient, which are recorded in the first, second, third, fourth, fifth, sixth, seventh, eighth, ninth, and tenth registers, respectively.

From the first and second registers 1, 2, the data on the value of the interference power supplied to the antenna and on the value of the gain coefficient of the radio interference transmitter antenna in the direction of the receiver are fed through the first block of AND elements 9 to the first multiplication block 15. From the fourth register 4, the data on the value of the distance between the transmitter and the receiver of the signal are fed to the first block of raising to the second power 10. From the third register 3 and the first block of raising to the second power 10, the data on the value of the passband of the linear part of the receiver and the value of the square of the distance between the transmitter and the receiver of the signal are fed through the third block of AND elements 13 to the first multiplication block 15. Thus, in the first multiplication block 15, the product of the received initial data is formed, corresponding to the numerator of expression (6).

From the fifth and sixth registers 5, 6, the data on the value of the power supplied to the antenna and on the value of the gain coefficient of the antenna of the radio signal transmitter in the direction of the receiver are sent through the second block of AND elements 11 to the second multiplication block 16. From the eighth register 8, the data on the value of the distance between the interference transmitter and the signal receiver are sent to the second block of raising to the second power 12. From the seventh register 7 and the second block of raising to the second power 12, the data on the value of the width of the interference spectrum and the value of the square of the distance between the interference transmitter and the signal receiver are sent through the fourth block of AND elements 14 to the second multiplication block 16. Thus, in the second multiplication block 16, the product of the received initial data is formed, corresponding to the denominator of expression (6).

From the first multiplication block 15, the data is fed through the fifth block of AND elements 17 to the input of division block 18 as a dividend. From the second multiplication block 16, the data is fed through the fifth block of AND elements 17 to the input of division block 18 as a divider. Thus, in division block 18, the value of the coefficient K (the ratio of the interference power to the signal power at the receiver input) is formed.

From the dividing block 18, the data are fed to the first comparator 20. In the case where the value of the ratio of the interference power to the signal power at the receiver input, received from the dividing block 18, is less than the value of the reliable reception coefficient received from the ninth register 19 (condition (1) is satisfied), the first comparator 20 produces a single signal to the first information output of the device 34. In the case where the value of the ratio of the interference power to the signal power at the receiver input, received from the dividing block 18, is greater than the value of the reliable reception coefficient received from the ninth register 19 (condition (1) is not satisfied), the first comparator 20 produces a single signal to the sixth block of AND elements 21.

When a single signal is received from the first comparator 20 to the sixth block of AND elements 21, data is sent from the division block 18 to the second comparator 22.

In the case where the value of the ratio of the interference power to the signal power at the receiver input, received from the dividing unit 18, is less than the value of the suppression coefficient received from the tenth register 23 (condition (2) is satisfied), the second comparator 22 produces a single signal to the second information output of the device 35. In the case where the value of the ratio of the interference power to the signal power at the receiver input, received from the dividing unit 18, is greater than the value of the suppression coefficient received from the tenth register 23 (condition (2) is satisfied, and condition (3) is satisfied), the second comparator 22 produces a single signal to the third information output of the device 36.

Thus, when creating a utility model, the technical problem of creating a tool with a specific purpose (calculating the noise immunity indicator of radio lines - the ratio of the interference power to the signal power at the receiver input, as well as evaluating the obtained indicator according to specified criteria) was solved.

The circuit implementation of the presented utility model, presented in the description and formula of the device, contains the necessary and sufficient number of technical units and blocks, connected to each other in a certain way, and allows for the calculation of the noise immunity index of radio lines - the ratio of the interference power to the signal power at the receiver input in accordance with the mathematical expression (6), as well as the assessment of the obtained moments in accordance with criteria (1) - (3).

The claimed utility model is a technical solution related to a device, as the utility model formula contains a set of essential features related to the device (namely, a list of the elements used and the relationships between them) sufficient to solve the stated problem and achieve the technical result. These features are considered essential because they affect the feasibility of achieving the technical result, i.e., they are causally related to the stated result. The absence of one or more features will render the device inoperable and prevent the claimed result from being achieved.

The technical result of this utility model is that, when implementing and using this device, an expansion of the arsenal of means for a specific purpose is ensured, allowing for the calculation of the value of the ratio of the interference power to the signal power at the receiver input and for the assessment of the noise immunity of radio lines.

In addition, the presented device can be used:

to assess the fulfillment of the requirements for interference immunity of a radio line given its specified characteristics and the characteristics of interference stations;

to determine the maximum required power of a signal transmitter that ensures the required noise immunity;

to select the antennas of the signal transmitter and receiver and their characteristics that ensure the required noise immunity;

to determine the size of the zone within which it is possible to suppress electronic equipment.

The presented device is designed with the possibility of connection to other technical systems or modeling systems due to the presence of information inputs and outputs.

The described device for assessing the noise immunity of radio lines can be implemented using units and blocks known in the field of radio electronics, connected to each other, ensuring constructive and functional unity.

Claims (1)

A device for assessing the noise immunity of radio links, comprising a first register for recording the value of the interference power supplied to the antenna, a second register for recording the value of the gain of the antenna of the radio interference transmitter in the direction of the receiver, a third register for recording the value of the bandwidth of the linear part of the receiver, a fourth register for recording the value of the distance between the transmitter and the signal receiver, a fifth register for recording the value of the power supplied to the antenna, a sixth register for recording the value of the gain of the antenna of the radio signal transmitter in the direction of the receiver, a seventh register for recording the value of the width of the interference spectrum, an eighth register for recording the value of the distance between the interference transmitter and the signal receiver, a ninth register for recording the value of the reliable reception coefficient, a tenth register for recording the value of the suppression coefficient, first, second, third, fourth, fifth and sixth blocks of AND elements, first and second blocks of raising to the second power, the first block a multiplication unit designed to obtain the product of the initial data received from the first, second and third registers, as well as from the first raising to the second power block, a second multiplication unit designed to obtain the product of the initial data received from the fifth, sixth and seventh registers, as well as from the second raising to the second power block, a division unit designed to obtain the quotient of the data received from the first and second multiplication units and to directly calculate the ratio of the interference power to the signal power at the receiver input, a first comparator designed to directly compare the value of the ratio of the interference power to the signal power at the receiver input received from the division unit and the value of the reliable reception coefficient received from the ninth register, a second comparator designed to directly compare the value of the ratio of the interference power to the signal power at the receiver input received from the division unit through the sixth block of AND elements and the value of the suppression coefficient received from the tenth register, a first information input designed to input data on the value of the interference power supplied to antenna, a second information input intended for entering data on the value of the antenna gain of the radio interference transmitter in the direction of the receiver, a third information input intended for entering data on the value of the bandwidth of the linear part of the receiver, a fourth information input intended for entering data on the value of the distance between the transmitter and the signal receiver, a fifth information input intended for entering data on the value of the power supplied to the antenna, a sixth information input intended for entering data on the value of the antenna gain of the radio signal transmitter in the direction of the receiver, a seventh information input intended for entering data on the value of the spectrum width of the interference, an eighth information input intended for entering data on the value of the distance between the interference transmitter and the signal receiver, a ninth information input intended for entering data on the value of the reliable reception coefficient, a tenth information input intended for entering data on the value of the suppression coefficient, a first information output of the device intended for outputting a single value in the case when the value of the ratio the interference power to the signal power at the receiver input will be less than the value of the reliable reception coefficient, the second information output of the device, designed to output a single value, in the case when the value of the ratio of the interference power to the signal power at the receiver input will be greater than the value of the reliable reception coefficient, but less than the value of the suppression coefficient, the third information output of the device, designed to output a single value, in the case when the value of the ratio of the interference power to the signal power at the receiver input will be greater than the value of the suppression coefficient, wherein the first, second, third, fourth, fifth, sixth, seventh, eighth, ninth and tenth information inputs are connected to the first, second, third, fourth, fifth, sixth, seventh, eighth, ninth and tenth registers, respectively, the outputs of the first and second registers are connected to the inputs of the first block of AND elements, the output of the fourth register is connected to the input of the first block of raising to the second power, the outputs of the third register and the first block of raising to the second power are connected to the inputs of the third block of AND elements, the outputs of the fifth and sixth registers are connected to the inputs of the second block of AND elements, the output of the eighth register is connected to the input of the second exponentiation block, the outputs of the seventh register and the second exponentiation block are connected to the inputs of the fourth block of AND elements, the output of the ninth register is connected to the input of the first comparator, the output of the tenth register is connected to the input of the second comparator, the outputs of the first and third blocks of AND elements are connected to the inputs of the first multiplication block, the outputs of the second and fourth blocks of AND elements are connected to the inputs of the second multiplication block, the outputs of the first and second multiplication blocks are connected to the inputs of the fifth block of AND elements, the outputs of the fifth block of AND elements are connected to the inputs of the division block, the output of the division block is connected in parallel to the inputs of the first comparator and the sixth block of AND elements, the first output of the first comparator is the first information output of the device, the second output of the first comparator is connected to the input of the sixth block of AND elements, the output of the sixth block of AND elements is connected to the input of the second comparator, the first output of the second comparator is the second information output of the device, the second output of the second The comparator is the third information output of the device.