RU2045093C1 - Device modelling electromagnetic situation on object - Google Patents

Abstract

FIELD: instrumentation. SUBSTANCE: device modelling electromagnetic situation on object compared with prototype makes it possible to enhance precision of modelling several times due to random character of assignment of frequencies of reception and transmission for communication means of object. Structural diagram of device and its operational principle are specified in description of invention. EFFECT: enhanced modelling precision. 1 dwg

Description

 The invention relates to electronic modeling and can be used in laboratory testing of an object saturated with a large number of receivers and transmitters operating in real conditions of an electromagnetic environment.

 Known devices for simulating the operation of communication systems [1] as well as ultra-short-wave (VHF) radio channels in a communication system [3] These devices solve the problem of either selecting the best channel by the minimum interference level [2] or determining the combinatorics of the placement of side channels on the frequency axis [ 1] These devices do not give an idea of the characteristics of changes in the electromagnetic environment at the facility over time.

Of the known devices, the closest in technical essence to the proposed one is a device for modeling an VHF radio channel in a communication system [3]
This device contains a group of generators of useful signals, a group of attenuators, a simulator of fading signals, a simulator of electromagnetic conditions, a generator of random uncorrelated flows of rectangular pulses, a generator of modulating signals, a group of receivers and transmitters. The device allows you to simulate the operation of the VHF radio channel in a communication system.

 The disadvantage of the prototype device is that the simulation of the electromagnetic environment is performed at one pre-set frequency value for reception and transmission. This is not enough, since it is known that in the HF band the conditions for the propagation of radio waves periodically change depending on the time of year and day, which leads to a change in the nominal frequencies that are possible for reception and transmission. In addition, the exchange of messages between the object and its many correspondents is random in nature, which is also not taken into account by the prototype device.

 The aim of the present invention is to improve the accuracy of modeling the electromagnetic environment at an object saturated with a large number of receivers and transmitters.

 This goal is achieved in that in a device containing a simulator of an electromagnetic environment, including a group of adders, an isolation unit and a group of attenuators, as well as a group of receivers and transmitters and a group of generators of useful signals, and in the simulator of an electromagnetic environment, the outputs of the attenuators of the group are connected to the corresponding inputs of the isolation unit the outputs of which are connected to the first inputs of the corresponding adders of the group, the outputs of which are connected to the inputs of the respective receivers of the group, the outputs of the cat They are the group of information outputs of the device, the outputs of the transmitters of the group are connected to the inputs of the corresponding attenuators of the electromagnetic simulator group, two additional sensors of random signals and two switches are additionally introduced, the output of the first sensor of random signals connected to the information input of the first switch, the outputs of which are connected to the start inputs of the corresponding generators of useful signals of the group, the outputs of which are connected to the second inputs of the corresponding adders of the group Ator electromagnetic environment, the sensor output of the second random signals is connected to the data input of the second switch, the outputs of which are connected to the inputs of respective transmitters group.

 The introduction of additional blocks increases the efficiency and accuracy of modeling the electromagnetic environment at the facility, since the random nature of the assignment of transmission and reception frequencies is taken into account.

 The applicant and the author are not aware of technical solutions containing features equivalent to the hallmarks of the claimed device. The applicant and the author are not aware of similar solutions from other areas of technology having the technical properties of the claimed subject matter. Thus, the claimed technical solution meets the criterion of significant differences.

 The drawing shows a structural diagram of a device for modeling the electromagnetic environment at the facility.

 The device comprises a first random signal sensor 1, a first switch 2, a group of useful signal generators 3.1-3.n, an electromagnetic environment simulator 4 containing a group of adders 5.1-5.n, an isolation unit 6 and a group of attenuators 7.1-7.n, group of receivers 8.1-8.n, group of transmitters 9.1-9. n, a second switch 10 and a second random signal sensor 11. Moreover, in the simulator of the electromagnetic environment, the outputs of the attenuators are connected to the corresponding inputs of the isolation block 6. The outputs of the isolation block 6 are connected to the first inputs of the adders 5.1-5.n, the outputs of which are information outputs of the device. The outputs of the transmitters 9.1-9.n are connected to the inputs of the corresponding attenuators 7.1-7. n simulator 4 electromagnetic environment. In this case, the first random signal sensor 1 is connected in series with the information input of the first switch 2, the outputs of which are connected to the start inputs of the useful signal generators 3.1-3.n. The outputs of the useful signal generators are connected to the second inputs of the respective adders 5.1-5.n of the electromagnetic simulator 4. The output of the second random signal sensor 11 is connected to the information input of the second switch 10, the outputs of which are connected to the inputs of the transmitters 9.1-9.n.

 At the output of block 1, a signal periodically appears with a random phase and amplitude distributed according to a uniform law, which through block 2 alternately enters the input of the corresponding generator 3, which, depending on this, each tunes to its own frequency. At the outputs of the generators 3.1-3.n, voltages of different frequencies are created, which are fed to the second inputs of the adders 5.1-5.n. The second random signal sensor 11 through the second switch 10 sequentially tunes each transmitter 9.1-9.n to its own random frequency. Attenuators 7.1-7.n are used to set the necessary attenuation values of the radiations of the transmitters 9.1-9.n, corresponding to the transition attenuations of these radiations depending on the simulated spatial arrangement of the receiving and transmitting antennas at the object.

 Block junction 6 serves to exclude the influence of each other transmitting channels. Adders 5.1-5. n mix signals from generators 3.1-3.n of useful signals with interference signals from transmitters 9.1-9.n.

 The device operates as follows.

 Previously, before the start of laboratory research, initial conditions are established that correspond to the placement of receiving and transmitting antennas at the facility. To do this, in the simulator 4, using the attenuators 7.1-7.n, the necessary attenuation values of the radiations of the transmitters 9.1-9.n are set. The first random signal sensor 1 3.14-3.n includes sequentially through the switch 2 generators of useful signals, each at its own frequency. The second random signal sensor 11 through the switch 10 tunes each of the transmitters 9,1-9.n to its own frequency. The signals from the transmitters through the attenuator 7, the isolation block 6 and the adders 5.1-5.n are fed to the inputs of the receivers 8.1-8.n. From the outputs of the receivers, the resulting signal is fed to the output of the device for registration and measurement, where it is evaluated by measuring the signal-to-noise ratio. Next, the process is repeated within a tenfold change in the frequencies of reception and transmission, after which the statistical characteristics of the signal-to-noise ratio are determined by calculation in the conditions of a given electromagnetic environment.

 The random signal sensor is a random signal generator, which can be implemented according to the scheme (Shlyapobersky V.I. Fundamentals of discrete message transmission technology. M. Communication, 1973, p. 169, 170). As switches 2 and 10, switches of the KVS-2 type can be used ("Short-wave antennas. / Ed. By G.Z. Aisenberg, p. 478-479).

где t(p) определяется по заданной доверительной вероятности p;
n количество измерений.Using the proposed device in comparison with the prototype allows you to take into account the random nature of the appointment of frequencies of reception and transmission and to reduce the confidence of the measured signal-to-noise ratio at the output of the radio receiver by 3.3 times. This follows from the fact that if the root mean square measurement error is known in advance, then a confidence estimate
ε t (p)

where t (p) is determined by a given confidence probability p;
n number of measurements.

t(p)

уменьшится в 3,3 раза.If n increases 10 times, then
ε t (p)

t (p)

decrease by 3.3 times.

 Thus, the claimed device allows to increase the accuracy of the simulation.

Claims (1)

 DEVICE FOR MODELING AN ELECTROMAGNETIC SITUATION AT THE OBJECT, containing a simulator of electromagnetic environment, including a group of adders, an isolation unit and a group of attenuators, as well as groups of receivers and transmitters and a group of generators of useful signals, and in the simulator of an electromagnetic environment, the outputs of the attenuators of the unit are connected to the corresponding inputs the outputs of which are connected to the first inputs of the respective adders of the group, the outputs of which are connected to the inputs of the respective receivers groups, the outputs of which are a group of information outputs of the device, the outputs of the transmitters of the group are connected to the inputs of the corresponding attenuators of the electromagnetic simulator group, characterized in that two random sensors and two switches are inserted into the device, the output of the first random signal sensor being connected to the information input of the first switch the outputs of which are connected to the start inputs of the corresponding generators of useful signals of the group, the outputs of which are connected to the second inputs with of the corresponding adders of the electromagnetic simulator group, the output of the second random signal sensor is connected to the information input of the second switch, the outputs of which are connected to the inputs of the respective transmitters of the group.

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