CN108055097A - Digital tv ground broadcasting and its construction method - Google Patents
Digital tv ground broadcasting and its construction method Download PDFInfo
- Publication number
- CN108055097A CN108055097A CN201810044895.7A CN201810044895A CN108055097A CN 108055097 A CN108055097 A CN 108055097A CN 201810044895 A CN201810044895 A CN 201810044895A CN 108055097 A CN108055097 A CN 108055097A
- Authority
- CN
- China
- Prior art keywords
- signal
- transmitter
- filter circuit
- power
- frequency
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
- H04H20/65—Arrangements characterised by transmission systems for broadcast
- H04H20/71—Wireless systems
- H04H20/72—Wireless systems of terrestrial networks
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H60/00—Arrangements for broadcast applications with a direct linking to broadcast information or broadcast space-time; Broadcast-related systems
- H04H60/76—Arrangements characterised by transmission systems other than for broadcast, e.g. the Internet
- H04H60/81—Arrangements characterised by transmission systems other than for broadcast, e.g. the Internet characterised by the transmission system itself
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H60/00—Arrangements for broadcast applications with a direct linking to broadcast information or broadcast space-time; Broadcast-related systems
- H04H60/76—Arrangements characterised by transmission systems other than for broadcast, e.g. the Internet
- H04H60/81—Arrangements characterised by transmission systems other than for broadcast, e.g. the Internet characterised by the transmission system itself
- H04H60/82—Arrangements characterised by transmission systems other than for broadcast, e.g. the Internet characterised by the transmission system itself the transmission system being the Internet
- H04H60/86—Arrangements characterised by transmission systems other than for broadcast, e.g. the Internet characterised by the transmission system itself the transmission system being the Internet accessed over CATV networks
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H60/00—Arrangements for broadcast applications with a direct linking to broadcast information or broadcast space-time; Broadcast-related systems
- H04H60/76—Arrangements characterised by transmission systems other than for broadcast, e.g. the Internet
- H04H60/81—Arrangements characterised by transmission systems other than for broadcast, e.g. the Internet characterised by the transmission system itself
- H04H60/90—Wireless transmission systems
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Radio Relay Systems (AREA)
Abstract
The invention discloses a kind of digital tv ground broadcasting and its construction methods, the system includes at least one transmitter, the transmitter includes sequentially connected first filter circuit, the first prime amplifying unit and power amplifier unit, wherein, the transmitter is used to launch from aerial reception digital television terrestrial broadcasting network signal and after handling it, depending on the signal value of first filter circuit is obtained based on the frequency of received signal and the power of the transmitter and quantity cover as needed area, landform and received signal.The present invention uses low power transmitter, reduces the selection requirement to launch point, therefore can be with flexible arrangement launch point.In addition, filtered and amplification signal carries out supplement transmitting in protection interval, main covering signal blind zone can be repaired.
Description
Technical field
The present invention relates to digital television terrestrial broadcasting technical fields, more particularly to digital tv ground broadcasting and its group
Construction method.
Background technology
In digital TV ground, wired, satellite transmission schemes, digital terrestrial television transmission system environment is the most complicated,
Also it is concerned due to its technology requires highest, audient is wide.The standard of ground system has United States advanced television systems committee
(ATSC), European Digital Video terrestrial broadcasting (DVB-T) and Japanese Terrestrial Integrated Services Digital Broadcasting (ISDB-T).1999 I
State sets up DTV research and development and industrialization key special subjects and sets up national digital TV leading group, clearly autonomous to formulate technology
Standard.For the specific standards of China Digital TV application, China Digital TV ground standard DTMB is proposed within 2006.
Terrestrial DTV transmission national standard is in the formal implementation on the 1st of August in 2007.2008,8 Olympic Games cities were opened
Logical digital terrestrial television.
2016, national standard DTMB the whole nation covering plan, promote DTMB top box of digital machines, DTMB digital moving-tvs,
Surface wave receives handheld device, 9 cun of DTMB mobile digital TVs, DMB-TH ground wave digital televisions and hand-portable DTMB movements
The development of the receiving device of the Suresh Kumars such as TV.
The wireless digitizing covering engineering of central broadcast TV programme covers national 31 provinces, municipalities and autonomous regions, municipalities directly under the Central Government, removes
More than 2500 a radio and television backbone transmitting stations, more than 500 50 watts of small-powers for also having Guangxi, Qinghai are mended point station, are related to altogether
6200 multi-section transmitters.
Center covering engineering terrestrial DTV frequency planning scheme is related to the existing ground launch station in each province, radio relay broadcasting station
It stands and mends some stations and amount to 3117, the principle (indivedual stations are 1 transmitter) of two transmitters is distributed according to each station,
The amount total of transmitter 6230.The project type of transmitter can be divided into 2 classes：One kind is to transform the hair of property, the i.e. frequency point
It penetrates machine and central program is broadcasted using DTMB modes originally, to meet the television program transmission requirement of center covering engineering, it is necessary to right
Transmitter undergoes technological transformation, and amounts to 384；Another kind of is newly-built property, that is, needs to carry out frequency used in the frequency point
New planning simultaneously buys new DTMB transmitters, and amounting to 5846, (578 transmitters in wherein Guangxi have particular/special requirement not yet to recruit
Mark).This frequency planning carries out frequency assignment planning mainly for 5846 newly-built transmitters.
Networking mode uses high-power, high mountain transmitting station station structure at present.Distance is remote between base station, is influenced by topography and geomorphology
Bigger and networking is complicated.There are many signal interference regions in network.Moreover, building, which blocks, generates many signal blind zones.
In addition, there are certain requirements because transmission power is high to launch point, between the base stations there may be the gap of many overlay areas,
Even there are many areas that can not be capped at all.On the basis of existing resource and technical solution, improve difficult.
The content of the invention
In order to solve the above technical problems, the present invention provides a kind of digital tv ground broadcasting and its construction method,
To supplement the covering of DTMB signals, the free existing DTMB overlay areas of elastic extension.
In a first aspect, an embodiment of the present invention provides a kind of digital tv ground broadcasting, which includes at least one
A transmitter, the transmitter include sequentially connected first filter circuit, the first prime amplifying unit and power amplifier unit,
In, the transmitter is used to launch from aerial reception digital television terrestrial broadcasting network signal and after handling it, described
First filter circuit is obtained based on the frequency of received signal and the power of the transmitter and quantity cover as needed
Area, landform and received signal signal value depending on.
In one embodiment, the transmitter can also include sequentially connected second filter circuit, the second prime is amplified
Unit and switch unit, the switch unit are connected between the first filter circuit and the first prime amplifying unit, so as to
Between connection and the second filter circuit and the first prime amplifying unit between one filter circuit and the first prime amplifying unit
Connection switches over, and second filter circuit is obtained based on the frequency of received signal.
In one embodiment, the transmitter can be that power emits equipment from 8 milliwatts to 50 watts of small-power, and single-point covers
Lid scope is from 5 meters to 20 kilometers.
In one embodiment, the first filter circuit and the second filter circuit may each comprise low-pass filter and high-pass filtering
Device for echo signal attenuation below 3dBm, inhibits more than 30dBm for non-targeted signal.
In one embodiment, the first prime amplifying unit and the second prime amplifying unit may each comprise low noise amplification
Device.
The advantageous effect of said program is：Since transmitter power is small, distance is near between base station, so to launch point
Selection require it is low, can be with flexible arrangement launch point.Furthermore filtered and amplification signal carries out supplement hair in protection interval
It penetrates, main covering signal blind zone, the free existing DTMB overlay areas of elastic extension can be repaired.
Second aspect, an embodiment of the present invention provides a kind of construction method of digital tv ground broadcasting, the systems
Including at least one transmitter, the transmitter includes sequentially connected filter circuit, prime amplifying unit and power amplifier unit, institute
It states transmitter to be used to launch from aerial reception digital television terrestrial broadcasting network signal and after handling it, this method bag
It includes：
It tests and analyzes received signal, draw the frequency of echo signal and signal value and the area for requiring supplementation with signal
The area in domain；
The filter circuit is designed based on the frequency of echo signal；
According to the area and the signal value of the echo signal and Combining with terrain situation come design the power of transmitter and
Quantity, to obtain the radio frequency overlay network that covering requires supplementation with the region of signal.
In one embodiment, described the step of designing filter circuit, can include the Frequency Design based on echo signal and go out filter
Wave circuit, then tests whether its performance meets pre-provisioning request, if conditions are not met, then adjusting the structure of filter circuit and/or interior
The parameter of portion's device.
In one embodiment, the step of designing the power and quantity of the transmitter, can include according to the area and mesh
It marks the signal value of signal and topographic features determines the power and quantity of transmitter, then judge that this is wide according to actual measured results
Whether the intensity of the radiofrequency signal of broadcast system transmitting reaches requirement and/or the region for requiring supplementation with signal is completely covered, if sentenced
Disconnected result is no, then the power and/or quantity of transmitter are adjusted according to measurement result.
Preferably, transmitter be power from 8 milliwatts to 50 watts of small-power emit equipment, single-point coverage from 5 meters to
20 kilometers.
Preferably, the filter circuit include low-pass filter and high-pass filter, for echo signal decay 3dBm with
Under, inhibit more than 30dBm for non-targeted signal, the prime amplifying unit includes low-noise amplifier.
Compared with prior art, the present invention has the following advantages and beneficial effect：
First, the airborne electromagnetic ripple pollution range of network consisting is small, and electromagnetic pollution is small in network's coverage area.
Second, the transmitting point selection requirement of networking is low, easily forms the common-frequency network of multiple exit point.
3rd, Network stretch uses existing aerial radiofrequency signal, it is not necessary to the signal source of transmitting be provided separately, reduce
Cost.
The advantages of additional aspect of the invention, will be set forth in part in the description, and will partly become from the following description
It obtains substantially or is recognized by present invention practice.
Description of the drawings
Fig. 1 is the principle model figure of filter circuit according to an embodiment of the invention；
Fig. 2 is the structural schematic of transmitter 10 according to an embodiment of the invention；
Fig. 3 shows a specific example of filter circuit 110 in Fig. 2；
Fig. 4 is the structural schematic of transmitter 40 according to another embodiment of the present invention；
Fig. 5 gives a kind of the schematic of the construction method of digital tv ground broadcasting according to embodiments of the present invention
Flow chart；And
Fig. 6 shows the allocation plan of the transmitter of the broadcast system according to an example.
Specific embodiment
In view of problems of the prior art, inventors herein propose a kind of thinking using small-power transmitting networking.This
Invention is a kind of in DTMB networks, emits supplementary signal and the technology of networking with small-power.It is aerial to design filter circuit processing
Electromagnetic wave controls small insertion loss, filters out useful signal, then designs low power transmitting equipment, can in reflected signal
The networking of small-power multi-point transmitting is realized in the protection interval received.
DTMB (Digital Television Terrestrial Multimedia Broadcasting) is digital electricity
Depending on the english abbreviation of ground multimedia broadcast.In DTMB systems, using the modulation of time-domain synchronization OFDM (OFDM)
Mode supports the data transmission in 8MHZ bandwidth.Plus protection interval between each symbols of the OFDM in subcarrier, reduce code
Between disturb, can support mobile communication well.As long as the time difference of unlike signal is less than protection interval, would not form dry with frequency
It disturbs.
According to embodiments of the present invention 1, a kind of digital tv ground broadcasting is provided, which includes at least one hair
Penetrate machine.The transmitter includes sequentially connected filter circuit, prime amplifying unit and power amplifier unit.Wherein, transmitter is from sky
Middle to receive digital television terrestrial broadcasting network signal and launch after handling it, the filter circuit is based on received signal
Frequency and obtain and the signal of area, landform and received signal that the power of transmitter and quantity cover as needed
Depending on value.
The transmitter of the present embodiment is that power emits equipment from 8 milliwatts to 50 watts of small-power, and single-point coverage is from 5 meters
To 20 kilometers.For example, low-noise amplifier may be employed in prime amplifying unit, two-stage or multistage work(may be employed in power amplifier unit
Rate amplifier.Since distance is small between base station, the transmitting signal of all base stations and their reflected signal are all in the protection of terminal
In interval.Therefore, the selection of launch point is easy, flexible arrangement.
In one embodiment, filter circuit in a manner that 5 rank high-pass filters are combined, is come using 5 rank low-pass filters
Realize narrow-band filtering.Out-of-band interference point inhibits 30 to 50dBm.Its principle model figure is as shown in Figure 1.
Fig. 2 is the structural schematic of transmitter 10 according to an embodiment of the invention.As shown in Fig. 2, transmitter 10
Including sequentially connected filter circuit 110, prime amplifying unit 130 and power amplifier unit 140.Filter circuit 110 includes low pass filtered
Ripple device 111 and high-pass filter 112, to realize that bandwidth is, for example, the narrow-band filtering of 8MHz.Filter circuit 110 is according to various regions frequency
It puts to design, it is desirable that for echo signal attenuation below 3dBm, inhibit more than 30dBm for non-targeted signal.
Beijing area uses tri- DTMB frequency points of 626MHz, 666MHz and 674MHz, and Fig. 3 shows filter circuit in Fig. 2
110 are applied to a specific example of Beijing area.In Fig. 3, resistance R0, capacitance C1 to C6 and inductance L1 and L2 constitute low
Bandpass filter 111, resistance R1, capacitance C6 to C11 and inductance L3 and L4 constitute high-pass filter 112.Wherein, resistance R0
Resistance value is 75 Ω, and the capacitance of capacitance C1 to C5 is respectively 2pF, 100pF, 2.2pF, 3.3pF and 3.3pF, the appearance of capacitance C6 to C11
Value is respectively 2.2pF, 2.7pF, 3.6pF, 1.5pF, 1.8pF and 4.7pF, the inductance value of inductance L1 and L2 be respectively 12nH and
10nH。
Filter circuit 110 in above-mentioned example is analog filter, it will be understood by those skilled in the art that filter circuit
110 can also use digital filter, write program by the memory to digital filter, so that it may realize various filtering work(
Energy.
It is preceding after the filtering for the filtered circuit 110 of digital television terrestrial broadcasting network signal that antenna receives in Fig. 2
Grade amplifying unit 130 amplifies, to meet requirement of subordinate's power amplifier to incoming level.In order to reduce noise, ensure the linear of signal
Degree, prime amplifying unit 130 are, for example, low-noise amplifier LNA, and power amplification is 16dBm or so.Power amplifier unit 140 can be adopted
With AB class linear amplifiers, such as lateral diffusion metal oxide semiconductor (i.e. LDMOS) device, to meet OFDM for power amplifier
Linear, stability and dynamic range etc. high requirement, the letter for specifying power (such as 300mW) is exported from power amplifier unit 140
Number launch to antenna.According to actual conditions, those skilled in the art can further increase final stage power amplifier and be attached thereto
Bandpass filter, to export the radiofrequency signal of maximum 50W.
In addition, transmitter 10 can include the power supply and monitoring unit of power supply to the device, to realize long-haul telemetry and monitoring.
Further, transmitter 10 can include the directional coupler being connected with power amplifier unit 140, so that incident, reflected signal is coupled
Go out for monitoring.
Fig. 4 is the structural schematic of transmitter 40 according to another embodiment of the present invention.In Fig. 4, the first filter circuit
410th, the first prime amplifying unit 430 and power amplifier unit 440 can be with filter circuit 110, the prime amplifying units 130 in Fig. 2
It is identical with power amplifier unit 140, detailed description thereof is omitted herein.For example, the first prime amplifying unit 430 and power amplifier unit
440 can realize the gain of 30dB jointly, and the condition of this parameter is 1dB compression point measured values.
Transmitter 40 further includes the second filter circuit 420, the second prime amplifying unit 450, power governor 460 and switching
Unit 470.Second filter circuit 420 and the second prime amplifying unit 450 can respectively with before the first filter circuit 410 and first
Grade amplifying unit 430 is identical.Switch unit 470 is, for example, to switch, when control switch unit 470 makes aerial radiofrequency signal via the
When two filter circuits 420, the second prime amplifying unit 450 and power governor 460 are input to the first prime amplifying unit 430,
Two level amplification can be carried out to signal.Compared to the situation that signal is transmitted from the first filter circuit 410, the work(of signal can be improved
Rate and linear.In practical applications, when the level attenuation for monitoring radiofrequency signal is larger or breaks down, can grasp manually
Make switch unit 470 and realize switching, to ensure the stability of system.
Overflow in order to prevent can set power governor 460, be, for example, adjustable attenuator, can make signal
Decay 0dB, 3dB, 6dB or 9dB.It will be appreciated by those skilled in the art that it can also temporarily use circumferential work between two-stage amplification
Rate adjuster is adjusted.
In the digital tv ground broadcasting of above-described embodiment, filter circuit obtained based on the frequency of signal and
Depending on the signal value of area, landform and the signal that the power and quantity of transmitter cover as needed.That is, first
Aerial signal is tested, draw features such as the frequency of echo signal, intensity in network and requires supplementation with the area in the region of signal, root
It is believed that number Frequency Design filter circuit, design transmitter further according to the intensity of the area and signal and Combining with terrain situation
Power and quantity.The transmitter of the present embodiment is that power emits equipment from 8 milliwatts to 2 watts of small-power.Utilize the system structure
The Network stretch built uses existing aerial radiofrequency signal, it is not necessary to the signal source of transmitting be provided separately, therefore can reduce into
This.Filtered and amplification signal carries out supplement transmitting in protection interval, can supplement the covering of DTMB signals, freely elasticity
Extend existing DTMB overlay areas.
Digital tv ground broadcasting in above-described embodiment, will to the selection of launch point using low power transmitter
Ask low, therefore can be with flexible arrangement launch point.Further, since power is small, frequency can be adjusted flexibly.
On the other hand, the present invention provides a kind of establishment sides of the digital tv ground broadcasting of the embodiment of the present invention 1
Method, the executive agent of this method can be server.The construction method comprises the following steps：
S10 is tested and is analyzed aerial signal, is drawn the frequency of echo signal and signal value in network and is required supplementation with letter
Number region area；
S20 designs filter circuit based on the frequency of echo signal；
S40 designs the work(of transmitter according to the area and the signal value of the echo signal and Combining with terrain situation
Rate and quantity, to obtain the radio frequency overlay network that covering requires supplementation with the region of signal.
Fig. 5 gives a kind of the schematic of the construction method of digital tv ground broadcasting according to embodiments of the present invention
Flow chart.In step S511, composed using frequency spectrograph test airborne electromagnetic wave frequency.In step S512, carried out for electromagnetic spectrum
Analysis, draw the frequency of echo signal in network, in intensity and signal-to-noise ratio numerical value and frequency band other non-targeted signals frequency
And intensity, while obtain requiring supplementation with the area in the region of signal.
Next, in step S521, filter circuit is designed according to frequency spectrum.It is required that filter circuit is decayed for echo signal
Below 3dBm inhibits more than 30dBm for non-targeted signal.In step S522, throwing plate, welding and the tune of circuit are filtered
Examination, and test its performance.Hereafter, process proceeds to step S523, for the performance of filter circuit whether meet index request into
Row judges.For example, whether the cutoff frequency of test filter circuit, insertion loss, passband filter line, stopband attenuation etc. meet predetermined want
It asks.If meeting index request, process proceeds to step S541.Otherwise, process returns to step S521, adjusts filter circuit
The parameter of structure and/or internal components, a time design of iteration.
In step S541, set according to the area and the intensity of echo signal and Combining with terrain situation obtained in step S512
Count the power and quantity of transmitter.
In this step, the area, landform and the signal value design small-power transmitting domain that cover as needed.For example, for
Volume is 30 meters * 30 meters * 30 meters of building structure, designs the power of transmitter as 300mW, and number is set up using individual transmitter
Television terrestrial broadcasting system.
In typical covering design model, single emission point is used in the range of 10,000 square metres, the work(of 300mW is installed
Rate equipment.Fig. 6 shows the allocation plan of the transmitter of the broadcast system according to an example.In Fig. 6, a=100 meters, b=50
Rice.As shown in fig. 6, the launch point P, each launch point P of 9 or more are employed in the range of 90,000 square metres uses one
300mW emits equipment, and 90,000 square metres of network is covered so as to form one by 9 or more launch points.Due to each launch point P
Power Control in 300mW, therefore for other regions in non-point region and non-coverage in network coverage
The electromagnetic interference very little of generation.
For extreme terrain, building structure etc., in a launch point coverage being likely to occur local signal is shielded
Situation.In order to solve the problems, such as this, can choose rational position increases a launch point.As shown in fig. 6, the upper right side in figure
A launch point P is added in high mountain region, so as to fulfill the network in target coverage area being an all standing.This networking side
Formula is not present in high-power network, solves the problems, such as that same frequency net can not be mended a little.
Then, in step S542, the throwing plate of transmitter and networking debugging is carried out, tests actual effect.If target area
The intensity of interior electromagnetic wave signal reaches pre-provisioning request, and target area is completely covered, and design is completed.Otherwise, process returns
To step S541, the power and/or quantity of transmitter are adjusted according to measurement result, with polishing signal power and/or eliminates signal
Blind area.
In the embodiment of the present invention, the signal of each launch point is homologous, synchronization, the radiofrequency signal of same-phase, that is, with frequency
Net signal.But (have signal when mending point high tower strong signal but exist with the nonsynchronous situation of frequency), small range may be employed
Power compression, to solve the bad signal section in the critical zone of high tower signal.
The present invention at least has the advantages that compared with the prior art
First, the airborne electromagnetic ripple pollution range of network consisting is small, and electromagnetic pollution is small in network's coverage area.
Second, the transmitting point selection requirement of networking is low, easily forms the common-frequency network of multiple exit point.
3rd, Network stretch uses existing aerial radiofrequency signal, it is not necessary to the signal source of transmitting be provided separately, reduce
Cost.
In several embodiments provided herein, it should be understood that embodiments described above is only to illustrate
Property, disclosed apparatus and method can be realized by another way.The unit illustrated as separating component can be or
Person may not be physically separate, i.e. each functional unit in each embodiment of the present invention can integrate, can be with
It is individually to be physically present or two or more units integrate in a unit.
Although the embodiment of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it should not be construed as limiting the invention, those of ordinary skill in the art within the scope of the invention can be to above-mentioned
Embodiment modifies, replaces and modification.
Claims (10)
1. a kind of digital tv ground broadcasting, which includes at least one transmitter, and the transmitter includes connecting successively
The first filter circuit, the first prime amplifying unit and the power amplifier unit connect, wherein, the transmitter is used to receive number from aerial
Television terrestrial broadcasting network signal is simultaneously launched after handling it, the frequency of first filter circuit based on received signal
And it obtains and the signal value of area, landform and received signal that the power of the transmitter and quantity cover as needed
Depending on.
2. system according to claim 1, the transmitter further includes sequentially connected second filter circuit, the second prime
Amplifying unit and switch unit, the switch unit are connected between the first filter circuit and the first prime amplifying unit, so as to
Connection and the second filter circuit and the first prime amplifying unit between the first filter circuit and the first prime amplifying unit it
Between connection switch over, second filter circuit is obtained based on the frequency of received signal.
3. system according to claim 1 or 2 is sent out wherein the transmitter is power from 8 milliwatts to 50 watts of small-power
Jet device, single-point coverage is from 5 meters to 20 kilometers.
4. system according to claim 2, wherein the first filter circuit and the second filter circuit include low-pass filter
And high-pass filter, for echo signal attenuation below 3dBm, inhibit more than 30dBm for non-targeted signal.
5. system according to claim 2, wherein the first prime amplifying unit and the second prime amplifying unit are including low
Noise amplifier.
6. a kind of construction method of digital tv ground broadcasting, which includes at least one transmitter, the transmitter
Including sequentially connected filter circuit, prime amplifying unit and power amplifier unit, the transmitter is used to receive number electricity from aerial
Launch after being handled depending on terrestrial broadcast networks signal and to it, this method includes：
It tests and analyzes received signal, draw the frequency of echo signal and signal value and the region for requiring supplementation with signal
Area；
The filter circuit is designed based on the frequency of echo signal；
The power of transmitter and quantity are designed according to the area and the signal value of the echo signal and Combining with terrain situation,
To obtain the radio frequency overlay network that covering requires supplementation with the region of signal.
7. construction method according to claim 6, wherein the step of design filter circuit is included based on echo signal
Frequency Design go out filter circuit, then test whether its performance meets pre-provisioning request, if conditions are not met, then adjusting filter circuit
Structure and/or internal components parameter.
8. construction method according to claim 6, wherein the step of designing the power and quantity of the transmitter includes root
The power and quantity of transmitter are determined according to the signal value and topographic features of the area and echo signal, then according to actual survey
Amount result judges whether the intensity of the radiofrequency signal of broadcast system transmitting reaches requirement and/or be completely covered and requires supplementation with signal
Region, if it is judged that be it is no, then according to measurement result adjust transmitter power and/or quantity.
9. the construction method according to one of claim 6 to 8, the transmitter is power from 8 milliwatts to 50 watts of small work(
Rate emits equipment, and single-point coverage is from 5 meters to 20 kilometers.
10. the construction method according to one of claim 6 to 8, wherein the filter circuit includes low-pass filter and height
Bandpass filter for echo signal attenuation below 3dBm, inhibits more than 30dBm, the prime amplification is single for non-targeted signal
Member includes low-noise amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810044895.7A CN108055097A (en) | 2018-01-17 | 2018-01-17 | Digital tv ground broadcasting and its construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810044895.7A CN108055097A (en) | 2018-01-17 | 2018-01-17 | Digital tv ground broadcasting and its construction method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108055097A true CN108055097A (en) | 2018-05-18 |
Family
ID=62126785
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810044895.7A Pending CN108055097A (en) | 2018-01-17 | 2018-01-17 | Digital tv ground broadcasting and its construction method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108055097A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109002788A (en) * | 2018-07-09 | 2018-12-14 | 歌尔股份有限公司 | Filtering method, filter and projection device |
| CN111404624A (en) * | 2019-01-02 | 2020-07-10 | 全一电子股份有限公司 | Wireless signal strength detecting device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007118347A1 (en) * | 2006-04-14 | 2007-10-25 | Zte Corporation | A cooperate broadcast system structure for cooperate the wire and wireless and a method thereof |
| CN101420562A (en) * | 2008-11-25 | 2009-04-29 | 福建先创电子有限公司 | Digital television signal blind compensating system and method |
| CN102571246A (en) * | 2011-12-16 | 2012-07-11 | 广州双友电子技术有限公司 | Broadband optical fiber frequency modulation broadcast amplifier and signal transmission system thereof |
| CN107371070A (en) * | 2017-07-21 | 2017-11-21 | 广州珠江移动多媒体信息有限公司 | A kind of method that digital television signal mends point optimization covering |
-
2018
- 2018-01-17 CN CN201810044895.7A patent/CN108055097A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007118347A1 (en) * | 2006-04-14 | 2007-10-25 | Zte Corporation | A cooperate broadcast system structure for cooperate the wire and wireless and a method thereof |
| CN101420562A (en) * | 2008-11-25 | 2009-04-29 | 福建先创电子有限公司 | Digital television signal blind compensating system and method |
| CN102571246A (en) * | 2011-12-16 | 2012-07-11 | 广州双友电子技术有限公司 | Broadband optical fiber frequency modulation broadcast amplifier and signal transmission system thereof |
| CN107371070A (en) * | 2017-07-21 | 2017-11-21 | 广州珠江移动多媒体信息有限公司 | A kind of method that digital television signal mends point optimization covering |
Non-Patent Citations (1)
| Title |
|---|
| 陈宏;张伟;陆建华;: "数字电视同频转发器在补点覆盖中的应用", 电视技术, no. 03, pages 3 - 4 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109002788A (en) * | 2018-07-09 | 2018-12-14 | 歌尔股份有限公司 | Filtering method, filter and projection device |
| CN111404624A (en) * | 2019-01-02 | 2020-07-10 | 全一电子股份有限公司 | Wireless signal strength detecting device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP2792086B1 (en) | Wireless communications network | |
| CN102291157B (en) | Multi-system channel multiplex circuit | |
| CN101094032A (en) | Radio signal coverage system | |
| CN101615958A (en) | The method for detecting isolation between antennas of digital radio repeater system | |
| CN108055097A (en) | Digital tv ground broadcasting and its construction method | |
| WO2023011288A1 (en) | Signal processing system and method | |
| CN102668557B (en) | Protection satellite reception is not by the device that strong ground signal affects | |
| CN205123717U (en) | Self -adaptation interference suppression's high dynamic high sensitivity wideband receiver | |
| CN102984466B (en) | A system and a method for terrestrial-cable transition | |
| CN207442845U (en) | A kind of new multiband WiMAX repeater | |
| CN102307064A (en) | Frequency-shift-based multi-system analogue fiber broadband access system and transmission method thereof | |
| CN207664989U (en) | Digital tv ground broadcasting | |
| CN105322976A (en) | High-dynamic high-sensitivity broadband receiver with self-adaptive interference suppression | |
| CN1921623A (en) | Network-estabilishing method and system for ground digital videocast single-frequency network | |
| CN101908663B (en) | Self-adaptive bandpass filter and related down converter thereof | |
| CN104301910B (en) | A kind of CATV is total to cable multi-standard room division multiplexing method and system | |
| CN216700155U (en) | Demodulator circuit with satellite simulation and digital broadcasting | |
| CN103997354B (en) | A kind of mixing system, mixer device and frequency mixing method | |
| CN214480568U (en) | Analog receiving assembly for broadband radio frequency direct sampling | |
| CN103165967B (en) | A kind of coupler and the common transport system based on repeater room subsystem | |
| CN100411315C (en) | High frequency receiving device | |
| CN206835067U (en) | A kind of Miniaturized multiband RDSS radio-frequency modules | |
| CN108886405B (en) | Signal filtering method, device and system | |
| CN101488771B (en) | Optimization method for mobile phone front end receiving sensitivity | |
| CN116184043B (en) | Broadband electromagnetic environment monitoring system for unmanned aerial vehicle platform |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |