CN105260500A - Simulator for field wire - Google Patents

Abstract

The invention discloses a simulator for a field wire. The simulator is based on an FPGA development board, an analog-digital sampling module samples an analog signal sent by a remote transmission device of a sending end and converts the analog signal into a digital signal; a fast Fourier transform module transforms the digital signal from a time domain to a frequency domain; an Ethernet module is connected with a control computer, and the control computer transmits control information to the development board; the Ethernet module transmits analog characteristic parameter information of the field wire to a parameter storage module to be stored; a calculation module calculates a signal output by the fast Fourier transform module according to the analog characteristic parameter information of the field wire, in order to simulate the transmission characteristics of the field wire; and the fast Fourier transform module transforms the signal from the frequency domain to the time domain and matches with a digital-to-analog conversion module to convert a simulation result of the transmission characteristics of the field wire into a form capable of being received by the remote transmission device. The simulator disclosed by the invention can save the time of establishing a wireless communication system meeting the requirements of field operations.

Description

A kind of emulator for covered wire

Technical field

The present invention relates to covered wire field, particularly relate to a kind of emulator for covered wire.

Background technology

Covered wire is the critical transmissions medium of field operations electrical communication, has widespread use in the field such as audio frequency and digital communication.Set up Network Topology with covered wire, there is simple to operate, stable performance, maneuverability, draw materials conveniently, advantage with low cost, the task of high and cold mountain region field operations commander can be born.

In actual applications, need to assess the transmission performance of different length, model covered wire fast, in time, so that build the wired communication system meeting field operations demand in time.In order to the communication performances such as the output level to covered wire link, channel quality, transfer rate carry out timely Evaluation and Prediction, need development covered wire emulator, by connecting two covered wire teletransmission equipment, can according to setting simulation different model, certain length covered wire, the communication performance under different agreement.But at present in actual applications, few people propose relevant complete implementation.

Summary of the invention

The invention provides a kind of emulator for covered wire, the present invention can make teletransmission equipment, utilizes covered wire in same place, carries out long-distance transmissions, described below:

For an emulator for covered wire, described emulator is based on FPGA development board, and described emulator comprises:

Modulus sampling module, to the analog signal sampling that the teletransmission equipment of transmitting terminal sends, becomes simulating signal into digital signal;

Fast Fourier transform module, carries out Fast Fourier Transform (FFT) to digital signal, digital signal is transformed to frequency domain by time domain;

Ethernet module, connection control computing machine, control information is delivered to development board by computer for controlling; Ethernet module, by the analog feature parameter information of covered wire, is delivered to parameter memory module and stores;

Computing module, an input port is connected with fast Fourier transform module; Another input port is connected with the memory circuit of ethernet module; Output port is connected with inverse fast Fourier transform module; Computing module, according to the analog feature parameter information of covered wire, calculates the signal that fast Fourier transform module exports, realizes the simulation of the transport property to covered wire;

Inverse fast Fourier transform module, transforms to time domain by signal from frequency domain, matches with D/A converter module, by the result of simulation covered wire transport property, becomes the form that teletransmission equipment can receive;

D/A converter module, converts digital signal to simulating signal, is convenient to the teletransmission equipment Received signal strength of receiving end.

The beneficial effect of technical scheme provided by the invention is: the present invention, by by the characterisitic parameter of covered wire, is imported FPGA development board into, can be assessed the transmission performance of different length, model covered wire fast, in time.The time of building the wired communication system meeting field operations demand can be saved, reduce the cost building the wired communication system meeting field operations demand.

Accompanying drawing explanation

Fig. 1 is a kind of structural representation of the emulator for covered wire.

In accompanying drawing, the list of parts representated by each label is as follows:

1: modulus sampling module; 2: fast Fourier transform module;

3: ethernet module; 4: computer for controlling;

5: parameter memory module; 6: computing module;

7: inverse fast Fourier transform module; 8: D/A converter module.

Embodiment

For making the object, technical solutions and advantages of the present invention clearly, below embodiment of the present invention is described further in detail.

In order to the communication performances such as the output level to covered wire link, channel quality, transfer rate carry out timely Evaluation and Prediction, the embodiment of the present invention proposes a kind of emulator for covered wire, see Fig. 1, this technical scheme is as follows: utilize FPGA development board, structure modulus sampling module 1, fast Fourier transform module 2, ethernet module 3, parameter memory module 5, computing module 6, inverse fast Fourier transform module 7 and D/A converter module 8, and computer for controlling 4 is connected with development board, realize the emulator of covered wire, wherein, the module of structure is as follows

Modulus sampling module 1, forms primarily of sampling A/D chip, input port and first control circuit.By first control circuit, sampling A/D chip is controlled, the analog signal sampling that sampling A/D chip sends the teletransmission equipment of transmitting terminal, simulating signal is become digital signal, be convenient to process.Modulus sampling module 1 matches with aftermentioned fast Fourier transform module (FFT module) 2, and time-domain signal is transformed into frequency domain.

Fast Fourier transform module (FFT module) 2, Fast Fourier Transform (FFT) is a highly effective algorithm calculating Fourier transform.In Digital Signal Analysis and Processing, Fourier transform is a kind of important conversion, and signal can be transformed from the time domain to frequency domain by it.By the programming device on FPGA development board, structure fast Fourier transform module 2.Utilize fast Fourier transform module 2, Fast Fourier Transform (FFT) is carried out to signal, signal is transformed to frequency domain by time domain, be convenient to calculate at frequency domain.

Ethernet module 3, forms primarily of ethernet port, Ethernet chip, second control circuit and memory circuit.Ethernet module 3 connection control computing machine 4 and parameter memory module 5.Controlled Ethernet chip by second control circuit, control information is delivered to development board by computer for controlling 4.Wherein, control information controls for computer for controlling 4 pairs of development boards; The analog feature parameter information of covered wire, is delivered to parameter memory module 5 and stores, to use these information, passes to computing module 6, processes the signal that fast Fourier transform module 2 exports.

Computing module 6, is constructed by the programming device on FPGA development board.Computing module 6 has two input ports and an output port.Wherein, an input port is connected with fast Fourier transform module 2; Another input port is connected with the memory circuit of ethernet module 3; Output port is connected with inverse fast Fourier transform module 7.Computing module 6, according to the analog feature parameter information of covered wire, calculates the signal that fast Fourier transform module 2 exports, realizes the simulation of the transport property to covered wire.

Inverse fast Fourier transform module 7, corresponding with fast Fourier transform module 2, also can be constructed by the programming device on FPGA development board.Inverse fast Fourier transform module 7, can transform to time domain by signal from frequency domain.Utilize inverse fast Fourier transform module 7, result of calculation is converted into time-domain signal.Inverse fast Fourier transform module 7 matches with D/A converter module 8, by the result of simulation covered wire transport property, becomes the form that teletransmission equipment can receive.

D/A converter module 8, forms primarily of conversion chip, output port and the 3rd control circuit.By the 3rd control circuit, conversion chip is controlled, convert digital signal to simulating signal, export from output port, be convenient to the teletransmission equipment Received signal strength of receiving end.

Wherein, first control circuit, second control circuit, the 3rd control circuit can be the devices such as single-chip microcomputer, and during specific implementation, the embodiment of the present invention does not limit this.

The embodiment of the present invention is to the model of each device except doing specified otherwise, and the model of other devices does not limit, as long as can complete the device of above-mentioned functions.

Embodiment 2

The embodiment of the present invention proposes a kind of solution being used for replacing long distance covered wire, below in conjunction with embodiment and accompanying drawing 1, is described the embodiment of the present invention.

One embodiment of the present of invention are: computer for controlling 4, by netting twine, is inserted into the ethernet port of ethernet module 3.Transmitting terminal teletransmission equipment, is connected with the input port of modulus sampling module 1.Receiving end teletransmission equipment, is connected with the output port of D/A converter module 8.By arranging model and the length of covered wire at computer for controlling 4, obtain the analog feature parameter information of covered wire.Computer for controlling 4, by ethernet module 3, by the analog feature parameter information of control information and covered wire, is delivered to development board.The teletransmission equipment of transmitting terminal sends simulating signal.Simulating signal, through modulus sampling module 1, becomes digital signal.

Computing module 6, to the digital signal obtained, by fast Fourier transform module 2, carries out Fast Fourier Transform (FFT), signal is transformed to frequency domain by time domain.According to the analog feature parameter information of covered wire, the signal that fast Fourier transform module 2 obtains is calculated, realize the simulation of the transport property to covered wire.Then, utilize inverse fast Fourier transform module 7, inverse fast Fourier transform is carried out to result of calculation.Signal after inverse fast Fourier transform, through D/A converter module 8, obtains simulating signal, thus can receiving end teletransmission equipment receive, obtain simulation result.

The embodiment of the present invention is to the model of each device except doing specified otherwise, and the model of other devices does not limit, as long as can complete the device of above-mentioned functions.

It will be appreciated by those skilled in the art that accompanying drawing is the schematic diagram of a preferred embodiment, the invention described above embodiment sequence number, just to describing, does not represent the quality of embodiment.

The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (1)

1. for an emulator for covered wire, described emulator, based on FPGA development board, is characterized in that, described emulator comprises:

Modulus sampling module, to the analog signal sampling that the teletransmission equipment of transmitting terminal sends, becomes simulating signal into digital signal;

Fast Fourier transform module, carries out Fast Fourier Transform (FFT) to digital signal, digital signal is transformed to frequency domain by time domain;

Ethernet module, connection control computing machine, control information is delivered to development board by computer for controlling; Ethernet module, by the analog feature parameter information of covered wire, is delivered to parameter memory module and stores;

Computing module, an input port is connected with fast Fourier transform module; Another input port is connected with the memory circuit of ethernet module; Output port is connected with inverse fast Fourier transform module; Computing module, according to the analog feature parameter information of covered wire, calculates the signal that fast Fourier transform module exports, realizes the simulation of the transport property to covered wire;

Inverse fast Fourier transform module, transforms to time domain by signal from frequency domain, matches with D/A converter module, by the result of simulation covered wire transport property, becomes the form that teletransmission equipment can receive;

D/A converter module, converts digital signal to simulating signal, is convenient to the teletransmission equipment Received signal strength of receiving end.