CN201118558Y

CN201118558Y - Short wave digital broadband transmission network device

Info

Publication number: CN201118558Y
Application number: CNU200720192276XU
Authority: CN
Inventors: 王东权; 张殿宏; 任继平; 武力
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-11-05
Filing date: 2007-11-05
Publication date: 2008-09-17
Anticipated expiration: 2017-11-05

Abstract

The utility model relates to a shortwave digital broadband optical fiber transmission network apparatus, consisting of a remote module, optical fibers and a main apparatus; wherein the remote module is connected with the main apparatus through the optical fibers. The network apparatus is characterized in that the remote module is composed of a protection circuit, an input match circuit, a band-pass filter, a low-noise amplifier, an A / D switching circuit, a signal processing circuit, a coding circuit, a parallel-to-serial converting circuit, an electro-optic converter, an optical amplifier, a laser drive circuit, a fault indication circuit and a power supply module; the main apparatus is composed of an optical receiver, an optical-electric converter, a serial-to-parallel converting circuit, a decoding circuit, a switching array circuit, a shunt output circuit, a drive circuit, a D / A switching circuit, a power supply module and a monitoring module. In the utility model, the traditional shortwave message receiving supply lead system is substituted by the digital broadband optical fiber transmission technology, the traditional shortwave message receiving supply lead transmission mode is broken through and optical-electric separation is realized; besides, the design philosophy of multi-path input, multi-path output, system self-healing and switching array is creatively and firstly put forward in the shortwave communication system, therefore the interference resistance property of the shortwave communication system is improved.

Description

Shortwave digital broadband optical fiber transmission network equipment

One, technical field

The utility model relates to the Information and Communication Engineering field, is specifically related to shortwave digital broadband optical fiber transmission network equipment.

Two, background technology

At present, in engineering construction, owing to be subjected to the restriction of technical conditions, the short-wave receiver feed line still uses radio frequency coaxial-cable.This connected mode not only project cost height, difficulty of construction is big, and brings great difficulty for the engineering addressing.

In recent years, optical fiber transmission technique is applied in high-speed data communication, radar, high frequency radio, the video/systems such as monitoring more and more widely.In various transmission mediums, Optical Fiber Transmission has advantages such as bandwidth, loss be little, radiationless.Utilize optical fiber lieu of radio-frequency coaxial cable, can improve transmission speed, extend transmission distance.

Three, utility model content

The purpose of this utility model provides shortwave digital broadband optical fiber transmission network equipment.Under the condition that does not change existing short-wave receiving antenna, short-wave reception equipment and working method, by adopting the digital broadband optical fiber transmission technique, realize that the short-wave receiving antenna field away from engineering, helps the engineering addressing, reduce project cost.

To achieve these goals, the utility model adopts following technical scheme:

Shortwave digital broadband optical fiber transmission network equipment:

(1), system forms

Shortwave digital broadband optical fiber transmission network equipment is made up of remote end module, optical fiber, main equipment, and remote end module connects main equipment by optical fiber.

(2), each part and effect

1, remote end module

Form by protective circuit, input matching circuit, band pass filter, low noise amplifier, A/D change-over circuit, signal processing circuit, coding circuit, parallel-to-serial converter, electricity/light conversion, image intensifer, drive circuit for laser, failure indicating circuit, power module.It mainly acts on:

(1) responds to the receiver protection circuit that the RF signal that gets off is sent to remote end module from short-wave receiving antenna.Protective circuit has double protection: on the one hand, can under the situation of system's operate as normal the anti lightning interference capability be arranged; On the other hand, when remote equipment was in holding state, protective circuit was RF signal shorts ground connection, prevented that the high energy electromagnetic pulse interference from injuring the electronic devices and components in the remote equipment.

(2) match circuit mainly plays the impedance transformation effect, makes the sending-end impedance coupling of the output and the low noise amplifier of reception antenna or feeder line, reduces reflection.

(3) effect of wideband low noise amplifier, band pass filter is the loss that reduces RF signal signal to noise ratio before converting digital signal to, and out-of-band signal is effectively suppressed, and guarantees that various frequency component signals can correctly be sampled by high-fidelity in the frequency band.

(4) the A/D change-over circuit is that analog signal conversion is become digital signal.Selection has enough A/D converters of high sample frequency, for signal provides a transparent passage; Selecting simultaneously has enough A/D converters of big figure place, improves the ability and the signal dynamics control ability that receive small-signal.

(5) wideband low noise amplifier, A/D change-over circuit and signal processing circuit are formed variable recess automatic gain control circuit, and the big requirement of short-wave signal dynamic range has been satisfied in the influence of signal fadeout when reducing short-wave signal and changing in ionosphere.

(6) before being modulated to optical transceiver, digital signal also signal to be encoded, adapt to the Optical Fiber Transmission requirement, has error correction simultaneously, convert parallel signal to serial signal behind the coding, to reduce the error code that the signal transmission causes, guarantee to revert to the quality of communication system received signal behind the short-wave signal.

(7) signal transmission passage adopts monomode fiber, and every road signal receives only needs 1 optical fiber.Unrepeatered transmission distance can reach 20km.Can select the optical transceiver of different transmission power according to the different distance of remote end module and message center, signal transmission distance does not add relaying and can reach more than the 60km.

(8) system adopts two-way optical-electric module and two-way optical fiber, except that transmission short-wave radio frequency signal, also realizes the duties call function of the radio frequency ground protection function and the regular maintenance of remote control remote end module.

2, main equipment

Form by optical receiver, light/electric conversion, serial-parallel conversion circuit, decoding circuit, array switched circuit, shunt output circuit, drive circuit, D/A change-over circuit, power module, monitoring module.It mainly acts on:

(1) optical signal receiving module is finished light signal amplification and photoelectric converting function, thereby light signal is reverted to the signal of telecommunication.

(2) decoding processing realizes the separation of short wave communication signal, clock signal, voice signal according to the coding protocol of remote end module, is sent to D/A converter and speech processing circuit.

(3) the array Switching Module is a digital exchange system, mainly finishes exchange, fault detect, self-healing function.When a certain road antenna or light path system operation irregularity, can switch to standby light path system work by the Automatic Program that presets in advance, send the alarm indication simultaneously, be sent to monitoring module; The array Switching Module can be finished being connected of any receiver and any one pair of antenna, and any one pair of antenna that can finish in all antenna fields uses for all receivers.According to the optical fiber telecommunications system requirement, the exchange capacity of present single portion main equipment elects 8 * 32 as, because system has adopted modularity design technology, also can be extended to 16 * 64 or more extensive according to user's needs.

(4) monitoring module is finished the control to the working method and the remote end module operating state of array Switching Module.Can finish the supervision of each light path system transmission signals quality, analyze to show the degree that antenna is disturbed, remote control selects one one or multi-section antenna to work simultaneously, when aerial signal quality severe exacerbation wherein, can automatically this aerial signal be closed, and switch to other antenna work.Monitoring module can show the operating state of each light path system, guarantees the property tieed up of system.

(3) specification requirement

1, require to adopt metal free optical fiber cable lieu of radio-frequency cable, can arrange a plurality of antenna fields in engineering about 20 kilometers or bigger scope, each antenna field can be set up plurality of antennas, is beneficial to the engineering addressing.

2, require remote end module to have defencive function and stronger antijamming capability, and require system to have multichannel input, multichannel output, system self-healing, array exchange capacity, improve the Shortwave Communication System interference free performance.

(4) the utility model innovative point is as follows:

1, adopt the digital broadband optical fiber transmission technique to substitute traditional short-wave receiver feed line system, broken through traditional short-wave receiver feed line transmission mode, realization photoelectricity is isolated, solved the contradiction that engineering and antenna field are built, created condition for reducing project cost, made the addressing of engineering and construction that historical change take place.

2, creatively in Shortwave Communication System, propose the design philosophy that multichannel input, multichannel output, system self-healing, array exchange first, improved the Shortwave Communication System interference free performance.Adopt 3,000,000 ultra-large FPGA Technology, can finish being connected of any short-wave receiver and any one pair of antenna, realize that any one pair of antenna in all antenna fields uses for all short-wave receivers; Can finish one pair of remote control selection or plurality of antennas works simultaneously, when one pair of aerial signal quality severe exacerbation wherein, can automatically this aerial signal be closed, and switch to other antenna work, as long as there is one pair of antenna operate as normal just can guarantee the unimpeded of whole Shortwave Communication System.

3, adopt interference spectrum detect, from motion tracking trap and adaptive gain control technology, solved a difficult problem that simultaneously high reject signal is suppressed at time domain and frequency domain.

4, adopt high-speed, high precision A/D modulus conversion technique, improved detectability and the signal dynamics control ability of system weak signal.

Three, description of drawings

Fig. 1 is the remote end module circuit block diagram;

Fig. 2 is the main equipment circuit block diagram.

Four, embodiment

Further specify below in conjunction with accompanying drawing:

As shown in Figure 1, 2, shortwave digital broadband optical fiber transmission network equipment is made up of remote end module, optical fiber, main equipment, and remote end module connects main equipment by optical fiber.Its signal flow:

(1) remote equipment

Protective circuit 1 → input matching circuit 2 → band pass filter 3 → low noise amplifier 4 → A/D change-over circuit 5 → signal processing circuit 6 → coding circuit 7 → parallel-to-serial converter 8 → electricity/light conversion 9 → image intensifer 10 → drive circuit for laser 11.

Failure indicating circuit 12 provides fault to show, power module 13 provides power supply to entire circuit.

(2) main equipment

Optical receiver 14 → light/electricity conversion 15 → serial-parallel conversion circuit 16 → decoding circuit 17 → array switched circuit 18 → along separate routes output circuit 19 → drive circuit 20 → D/A change-over circuits 21.

Monitoring module 22 is finished the control to the working method of array Switching Module and remote end module operating state, and monitoring module 22 can show the operating state of each light path system; Power module 23 provides power supply to entire circuit.

At last, should be pointed out that above embodiment only is the more representational example of the utility model.Obviously, the technical solution of the utility model is not limited to the foregoing description, and many distortion can also be arranged.All distortion that those of ordinary skill in the art can directly derive or associate from the disclosed content of the utility model all should be thought protection range of the present utility model.

Claims

Shortwave digital broadband optical fiber transmission network equipment is made up of remote end module, optical fiber, main equipment, and remote end module connects main equipment by optical fiber, it is characterized in that:

One, remote equipment

Form by protective circuit, input matching circuit, band pass filter, low noise amplifier, A/D change-over circuit, signal processing circuit, coding circuit, parallel-to-serial converter, electricity/light conversion, image intensifer, drive circuit for laser, failure indicating circuit, power module;

Its signal flow: protective circuit → input matching circuit → band pass filter → low noise amplifier → A/D change-over circuit → signal processing circuit → coding circuit → parallel-to-serial converter → electricity/light conversion → image intensifer → drive circuit for laser;

Failure indicating circuit provides fault to show that power module provides power supply to entire circuit;

Two, main equipment

Form by optical receiver, light/electric conversion, serial-parallel conversion circuit, decoding circuit, array switched circuit, shunt output circuit, drive circuit, D/A change-over circuit, power module, monitoring module;

Its signal flow: optical receiver → light/electricity conversion → serial-parallel conversion circuit → decoding circuit → array switched circuit → shunt output circuit → drive circuit → D/A change-over circuit;

Power module provides power supply to entire circuit;

Monitoring module is finished the control to the working method of array Switching Module and remote end module operating state, shows the operating state of each light path system.