CN105703788B - The low noise block downconverter and satellite receiving system used suitable for multiple-link satellite receiver - Google Patents
The low noise block downconverter and satellite receiving system used suitable for multiple-link satellite receiver Download PDFInfo
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- CN105703788B CN105703788B CN201610130767.5A CN201610130767A CN105703788B CN 105703788 B CN105703788 B CN 105703788B CN 201610130767 A CN201610130767 A CN 201610130767A CN 105703788 B CN105703788 B CN 105703788B
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/26—Circuits for superheterodyne receivers
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D7/00—Transference of modulation from one carrier to another, e.g. frequency-changing
- H03D7/16—Multiple-frequency-changing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/10—Polarisation diversity; Directional diversity
Abstract
The invention discloses a kind of low noise block downconverter and satellite receiving system used suitable for multiple-link satellite receiver,Low noise block downconverter is preset with N number of user's frequency band,And first it is 300~2350MHz intermediate-freuqncy signals by the frequency reducing of 10.7~12.75GHz satellite-signals,Then by selecting the designated television program intermediate-freuqncy signal corresponding to designated television program information in 300~2350MHz intermediate-freuqncy signals,Designated television program intermediate-freuqncy signal and controllable local oscillation signal are mixed down double conversion signal of the frequency range in one of free subscriber passband frequency range in N number of user's frequency band again,N number of user's frequency band is averagely divided by total frequency acceptance band of DVB and formed,The frequency of controllable local oscillation signal is calculated by the centre frequency of designated television program and the centre frequency of aforementioned free user's frequency band,Double conversion signal is finally exported by coaxial cable interface again.The present invention at most can export the TV programme signal of N roads independence simultaneously and save cable laying cost and user installation cost, the installation complexity for reducing system outdoor section.
Description
Technical field
The present invention relates to a kind of low noise block downconverter used suitable for multiple-link satellite receiver, and, it is low using this
The satellite receiving system of noise block down-converter.
Background technology
In the low noise block downconverter circuit design of traditional Ku wave bands, typically two local oscillators of 9.75/10.60GHz are used
Frequency, built-in 0/22KHz switching circuits, the 0/22KHz pulse signals exported by satellite television receiver select it respectively
Low, high local frequency, while the satellite-signal horizontally or vertically to be polarized with the 13/18V voltage switchings of satellite television receiver, lead to
Cross coaxial cable and be transferred to satellite television receiver, realize that Ku wave band programs Whole frequency band receives.But under traditional low noise
In Design of Inverter, two local frequencies of 9.75/10.60GHz are employed, cause circuit design to become complicated, and add
Testing time in process of production.And because each delivery outlet of custom low noise low-converter is required for by single only
Vertical coaxial cable is connected on a satellite television receiver of interior from open air and used, then so that in face of equipped with multiple
Satellite television receiver user, it is necessary to the more descending cables of independence, or even need multiple low noise block downconverters.Add peace
The complexity of dress, and need to pay very high cable laying cost, the business that cable has been laid simultaneously for those is used
Family and domestic consumer, it is necessary to reequip circuit again, expensive, and quantities is also very big.So in traditional low noise down coversion
In device circuit design, either in plant design production process, or in the case where needing to meet multi-user's use, all
There is many deficiencies.
The content of the invention
The technical problems to be solved by the invention are：There is provided under a kind of low noise used suitable for multiple-link satellite receiver
Frequency converter, and, using the satellite receiving system of the low noise block downconverter.
Solves above-mentioned technical problem, the technical solution adopted in the present invention is as follows：
A kind of low noise block downconverter used suitable for multiple-link satellite receiver, provided with antenna probe, low-noise amplifier,
The Ku wave band down coversion radio frequency chips of 10.40GHz local oscillation signals and the coaxial electrical for being communicated with DVB can be produced
Cable interface, the antenna probe connect the input of Ku wave band down coversion radio frequency chips by low-noise amplifier described in two-stage；
The Ku wave bands down coversion radio frequency chip is by 10.7~12.75GHz satellite-signals of input and the 10.40GHz local oscillation signals
Exported after being mixed into 300~2350MHz intermediate-freuqncy signals, it is characterised in that：Described low noise block downconverter is additionally provided with secondary change
Frequency control circuit, bandpass filter, signal amplification circuit and for for the Ku wave bands down coversion radio frequency chip and secondary change
The power circuit of frequency control circuit power supply；The double conversion control circuit is provided with automatic gain amplifier, analog-digital converter, number
Word channel stacked switch, frequency mixer, digital analog converter, the frequency multiplier that controllable local oscillation signal can be produced and connect with satellite television
The microprocessor of receipts machine communication protocol codec functions, the output end of the Ku wave bands down coversion radio frequency chip pass sequentially through one
The automatic gain amplifier and an analog-digital converter connect the input of the digital channel stacked switch, described mixed
One input of frequency device connects the output end of the digital channel stacked switch, another input connection of the frequency mixer
The output end of the frequency multiplier, the output end of the frequency mixer pass sequentially through the digital analog converter and institute are connected with bandpass filter
Coaxial cable interface is stated, the read port of the microprocessor connects the coaxial cable interface, the write port of the microprocessor
The coaxial cable interface, the TV programme selection output end connection of the microprocessor are connected by the signal amplification circuit
The control terminal of the digital channel stacked switch, the FREQUENCY CONTROL output end of the microprocessor connect the control of the frequency multiplier
End；
The microprocessor is preset with N number of user's frequency band, and the microprocessor will include described coaxial in frequency range
User's frequency band of cable interface output signal frequency is labeled as having taken user's frequency band and having removed having taken the out-of-band use of user
Family frequency band is labeled as free subscriber frequency band, wherein, N number of user's frequency band is averagely divided by total frequency acceptance band of DVB
Form, N is the positive integer more than 1, and the bandwidth of each user's frequency band isBW0 is described
The total bandwidth of DVB, spacing of the Δ BW between two neighboring user's frequency band, in k-th of user's frequency band
Frequency of heart CFk=(k-0.5) × BW1+ Δs BW+950MHz, k are positive integer and 1≤k≤N；The microprocessor can be by reading end
Mouth reads the free subscriber frequency band querying command that the coaxial cable interface receives and can sent by write port comprising current
The acknowledgement command of free subscriber frequency band Query Result so that the acknowledgement command by the signal amplification circuit amplify after pass through by
The coaxial cable interface output, also, the microprocessor can be read the coaxial cable interface by read port and be received
Double conversion control command, wherein, the double conversion control command include specify user's frequency band and designated television program letter
Breath, specified user's frequency band are k-th in N number of user's frequency band and belong to the current idle user frequency band inquiry
One of as a result, the designated television program information includes the centre frequency FREQ and bandwidth BW 2 of designated television program；Micro- place
Reason device can control digital channel stacked switch core out frequency from the 300~2350MHz intermediate-freuqncy signals received to be
IF=FREQ-10.04GHz, the designated television program intermediate-freuqncy signal output with a width of BW2, and the microprocessor can control
It is LO=CF that the frequency multiplier, which produces frequency,k+ IF controllable local oscillation signal so that the frequency mixer is by the designated television program
Intermediate-freuqncy signal and controllable local oscillation signal mixing into frequency between LO- (IF-0.5 × BW2) to LO- (IF+0.5 × BW2) two
Secondary frequency variation signal, and passed through after the double conversion signal is passed sequentially through into the digital analog converter and bandpass filter by described coaxial
Cable interface exports.
As one embodiment of the present invention, described antenna probe includes vertical polarized antenna probe and horizontal polarization
Antenna probe, the Ku wave bands down coversion radio frequency chip are bipolarity Ku wave band down coversion radio frequency chips, bipolarity Ku wave bands
It is defeated including vertical polarization that the input of down coversion radio frequency chip includes vertical polarization input and horizontal polarization input, output end
Go out end and horizontal polarization output end, the input of the digital channel stacked switch includes vertical polarization input and horizontal polarization
Input；The vertical polarized antenna probe connects the bipolarity Ku wave band down coversions by low-noise amplifier described in two-stage
The vertical polarization input of radio frequency chip, the horizontally-polarized antenna probe pass through described in low-noise amplifier connection described in two-stage
The horizontal polarization input of bipolarity Ku wave band down coversion radio frequency chips, the bipolarity Ku wave bands down coversion radio frequency chip hang down
Straight polarizing output passes sequentially through an automatic gain amplifier and an analog-digital converter connection numeral letter
The vertical polarization input of road stacked switch, horizontal polarization output end pass sequentially through an automatic gain amplifier and one
The analog-digital converter connects the horizontal polarization input of the digital channel stacked switch；The bipolarity Ku wave band down coversions
10.7~12.75GHz vertical polarizations satellite-signal of input and the 10.40GHz local oscillation signals are mixed into vertical by radio frequency chip
Output after the 300~2350MHz intermediate-freuqncy signals directly to polarize, by 10.7~12.75GHz horizontal polarizations satellite-signal of input and institute
State after 10.40GHz local oscillation signals are mixed into 300~2350MHz intermediate-freuqncy signals of horizontal polarization and export；The designated television program
Information also includes the polarised direction of designated television program, and the microprocessor can control the digital channel stacked switch from reception
To polarised direction identical with the designated television program 300~2350MHz intermediate-freuqncy signals in core out frequency be IF=
FREQ-10.04GHz, the designated television program intermediate-freuqncy signal output with a width of BW2.
In order to avoid the satellite television programming dropout data of low noise block downconverter output, it is ensured that DVB connects
The stability of TV programme signal is received, it is equal as the preferred embodiment of the present invention, the bandwidth BW 1 of each user's frequency band
More than the bandwidth BW 2 of any one of designated television program.
In view of the performance of existing DVB, and ensure BW1>BW2, as the preferred embodiment of the present invention, institute
State microprocessor and be preset with N=24 user's frequency band, total frequency acceptance band of the DVB is 950MHz~2150MHz,
Separation delta BW=4MHz, total bandwidth BW0=2150MHz-950MHz=1200MHz between two neighboring user's frequency band,
The bandwidth of each user's frequency band
The scope of the bandpass filter is 950-2150MHz.
As one embodiment of the present invention, described low noise block downconverter is additionally provided with for storing the microprocessor
The storage chip of the execution software program of device；The storage chip is connected with the respective pins of the microprocessor.
As one embodiment of the present invention, the satellite television receiver communication protocol be DiSEqC 1.x agreements,
Any one in DiSEqC 2.x agreements, EN50494 agreements and EN50607 agreements.
As one embodiment of the present invention, described coaxial cable interface is F head interfaces.
A kind of satellite receiving system, it is characterised in that：Described satellite receiving system includes a claim 1 to 8 times
Low noise block downconverter, a power divider and at most N platforms DVB described in meaning one, wherein, the power point
Orchestration has a main road port and tributary port at least equal with the DVB quantity, and N is under the low noise
The default user's number of frequency bands of microprocessor in frequency converter；The low noise block downconverter is installed outdoors, the power point
Orchestration and Ge Tai DVBs are installed in interior, and the coaxial cable interface of the low noise block downconverter is descending by one
The main road port of power divider described in cable connection, each DVB connect institute by a house cable
State the tributary port of power divider；The each DVB receives program request of the user to the designated television program
During instruction, the free subscriber frequency band querying command first is sent to the low noise block downconverter, then under the low noise
One of free subscriber frequency band is selected in the acknowledgement command of frequency converter feedback as specified user's frequency band, and this is specified into user
Frequency band and the designated television program information by being obtained in program request instruction are sent to institute as the double conversion control command
Low noise block downconverter is stated, selects in the double conversion signal finally exported by the low noise block downconverter and refers to the program request
The signal of corresponding frequency range is made to be decoded, to play the designated television program.
Compared with prior art, the invention has the advantages that：
First, low noise block downconverter of the invention is preset with N number of user's frequency band, and first by 10.7~12.75GHz satellites
Signal down is 300~2350MHz intermediate-freuqncy signals, then by being selected in 300~2350MHz intermediate-freuqncy signals corresponding to designated television
The designated television program intermediate-freuqncy signal of programme information, then designated television program intermediate-freuqncy signal and controllable local oscillation signal are mixed down frequency
Double conversion signal of the rate scope in one of free subscriber passband frequency range in N number of user's frequency band, wherein, it is N number of
User's frequency band is averagely divided by total frequency acceptance band of DVB and formed, and the frequency of controllable local oscillation signal is by designated television program
Centre frequency FREQ and the centre frequency of aforementioned free user's frequency band be calculated, finally export two by coaxial cable interface again
Secondary frequency variation signal, therefore, low noise block downconverter of the invention can at most export the TV programme signal of N roads independence simultaneously,
It is carried in per TV programme signal all the way on user's frequency band, each road TV programme signal is not interfere with each other between each other.
Second, according to the performance of existing DVB, and ensuring that it is stable that DVB receives TV programme signal
That is BW1>On the premise of BW2, low noise block downconverter of the invention can at most export the TV programme letter of 24 tunnel independences simultaneously
Number.
3rd, satellite receiving system of the invention uses above-mentioned low noise block downconverter, can be at most simultaneously to N platform satellites
Receiver exports independent TV programme signal, also, when the satellite receiving system of the present invention is installed, it is only necessary to by one
It is installed outdoors to state low noise block downconverter, a power divider and the installation of N platforms DVB indoors, then with a company
Connect outdoor low noise block downconverter and indoor power distribution is connected with the longer descending cable of the length of indoor power distributor with N roots
The shorter house cable of the length of device and indoor DVB can be completed to connect, compared to existing satellite receiving system section
The longer descending cable of N-1 root long degree is saved, therefore, satellite receiving system of the invention can independently make for N number of user simultaneously
With and can greatly save cable laying cost and user installation cost, reduce the installation complexity of system outdoor section.
Brief description of the drawings
The present invention is described in further detail with specific embodiment below in conjunction with the accompanying drawings：
Fig. 1 is the schematic block circuit diagram of the low noise block downconverter of the present invention；
Fig. 2 is the signal flow graph of the low noise block downconverter of the present invention, in figure：N represents 10.7~12.75GHz satellites
Include n satellite television programming Ch1~Chn, Chx in signal altogether and represent that user specifies what is received from n satellite television programming
Designated television program, frequency band of the trapezoidal wire frame representation to induction signal；
Fig. 3 is the schematic block circuit diagram of the satellite receiving system of the present invention.
Embodiment
As depicted in figs. 1 and 2, the present invention is applied to the low noise block downconverter that multiple-link satellite receiver uses, provided with vertical
Straight poliarizing antenna probe, horizontally-polarized antenna probe, low-noise amplifier LNA, the Ku that 10.40GHz local oscillation signals can be produced
It is wave band down coversion radio frequency chip IC1, double conversion control circuit IC2, bandpass filter, signal amplification circuit, micro- for storing
The storage chip Flash of the execution software program of processor, coaxial cable interface and use for being communicated with DVB
In the power circuit for Ku wave bands down coversion radio frequency chip IC1 and double conversion control circuit IC2 power supplies.Wherein, double conversion
Control circuit IC2 is provided with automatic gain amplifier, analog-digital converter ADC, digital channel stacked switch, frequency mixer Mix, digital-to-analogue and turned
Parallel operation DAC, the frequency multiplier PLL that controllable local oscillation signal can be produced and there are satellite television receiver communication protocol codec functions
Microprocessor；Ku wave band down coversion radio frequency chips IC1 is bipolarity Ku wave band down coversion radio frequency chips, bipolarity Ku wave bands
Down coversion radio frequency chip has vertical polarization input, horizontal polarization input, vertical polarization output end and horizontal polarization output
End, digital channel stacked switch have vertical polarization input and horizontal polarization input.
Above-mentioned vertical polarized antenna probe passes through two-stage low-noise amplifier LNA connection bipolarity Ku wave band down coversion radio frequencies
The vertical polarization input IN1 of chip, horizontally-polarized antenna probe pass through two-stage low-noise amplifier LNA connection bipolarity Ku ripples
The horizontal polarization input IN2 of section down coversion radio frequency chip, the vertical polarization output of bipolarity Ku wave band down coversion radio frequency chips
End OUT1 passes sequentially through the vertical of an automatic gain amplifier and analog-digital converter ADC connection digital channel stacked switch
Polarization input, horizontal polarization output end OUT2 pass sequentially through an automatic gain amplifier and an analog-digital converter ADC connects
Connect the horizontal polarization input of digital channel stacked switch；Bipolarity Ku wave band down coversion radio frequency chips by the 10.7 of input~
12.75GHz vertical polarizations satellite-signal mixes with 10.40GHz local oscillation signals in a manner of satellite frequency subtracts 10.40GHz
Frequently into output, 10.7~12.75GHz horizontal polarizations satellite letter by input after 300~2350MHz intermediate-freuqncy signals of vertical polarization
Be mixed into a manner of satellite frequency subtracts 10.40GHz number with 10.40GHz local oscillation signals horizontal polarization 300~
Exported after 2350MHz intermediate-freuqncy signals.
The output end of above-mentioned frequency mixer Mix input connection digital channel stacked switch, frequency mixer Mix's is another
Individual input connection frequency multiplier PLL output end, frequency mixer Mix output end pass sequentially through digital analog converter DAC and band logical filter
Ripple device connecting coaxial cable interface, the read port connecting coaxial cable interface of microprocessor, the write port of microprocessor pass through letter
Number amplifying circuit connecting coaxial cable interface, the TV programme selection output end connection digital channel stacked switch of microprocessor
Control terminal, the FREQUENCY CONTROL output end connection frequency multiplier PLL of microprocessor control terminal；Storage chip Flash and microprocessor
Respective pins connection.
Above-mentioned microprocessor is preset with N number of user's frequency band, and microprocessor will include coaxial cable interface in frequency range
User's frequency band of output signal frequency is labeled as having taken user's frequency band and having removed having taken the out-of-band user's frequency band mark of user
Be designated as free subscriber frequency band, wherein, N number of user's frequency band is averagely divided by total frequency acceptance band of DVB and formed, N be more than
1 positive integer, the bandwidth of each user's frequency band areBW0 is the total bandwidth of DVB,
Spacing of the Δ BW between two neighboring user's frequency band, the centre frequency CF of k-th of user's frequency bandk=(k-0.5) × BW1
+ Δ BW+950MHz, k are positive integer and 1≤k≤N；Microprocessor can read what coaxial cable interface received by read port
Free subscriber frequency band querying command simultaneously can send the acknowledgement command for including current idle user's frequency band Query Result by write port,
Exported so that acknowledgement command passes through after being amplified by signal amplification circuit by coaxial cable interface, also, microprocessor can pass through reading
The double conversion control command that coaxial cable interface receives is read in port, wherein, double conversion control command is included to specify and used
Family frequency band and designated television program information, user's frequency band is specified as k-th in N number of user's frequency band and belongs to current idle use
One of family frequency band Query Result, designated television program information include designated television program Chx polarised direction, centre frequency FREQ
With bandwidth BW 2；Microprocessor can control digital channel stacked switch from receiving polarization side identical with designated television program Chx
To 300~2350MHz intermediate-freuqncy signals in core out frequency be IF=FREQ-10.04GHz, the designated television with a width of BW2
Program intermediate-freuqncy signal exports, and it is LO=CF that microprocessor, which can control frequency multiplier PLL to produce frequency,k+ IF controllable local oscillator letter
Number so that frequency mixer Mix by designated television program intermediate-freuqncy signal and controllable local oscillation signal be mixed into frequency LO- (IF-0.5 ×
BW2) to the double conversion signal between LO- (IF+0.5 × BW2), because the double conversion signal belongs to k-th of user's frequency band
Frequency range within, therefore pass sequentially through digital analog converter which occupies k-th of user's frequency band, and by the double conversion signal
Through being exported by coaxial cable interface after DAC and bandpass filter.
Wherein, above-mentioned satellite television receiver communication protocol be DiSEqC 1.x agreements, DiSEqC 2.x agreements,
Any one in EN50494 agreements and EN50607 agreements.Coaxial cable interface is preferably F head interfaces.
In order to avoid the satellite television programming dropout data of low noise block downconverter output, it is ensured that DVB connects
The stability of TV programme signal is received, the bandwidth BW 1 of each above-mentioned user's frequency band is all higher than any one designated television program
Chx bandwidth BW 2.
In view of the performance of existing DVB, and ensure BW1>BW2, above-mentioned microprocessor are preset with N=24 use
Family frequency band, total frequency acceptance band of DVB is 950MHz~2150MHz, total bandwidth BW0=2150MHz-950MHz=
1200MHz, the separation delta BW=4MHz between two neighboring user's frequency band, the bandwidth of each user's frequency bandAccordingly, the scope of bandpass filter is 950-2150MHz.
As shown in figure 3, the satellite receiving system of the present invention, including an above-mentioned low noise block downconverter, a power point
Orchestration and at most N platforms DVB, wherein, power divider have a main road port and at least with DVB quantity
Equal tributary port, N are the default user's number of frequency bands of microprocessor in low noise block downconverter.Low noise block downconverter
Installed outdoors, power divider and Ge Tai DVBs are installed in interior, and the coaxial cable of low noise block downconverter connects
Mouthful a house cable is passed through by the main road port of a descending cable connection power divider, each DVB
Connect the tributary port of power divider；Each DVB receives program request of the user to designated television program Chx and referred to
When making, first free subscriber frequency band querying command, then answering from low noise block downconverter feedback are sent to low noise block downconverter
Answer and one of free subscriber frequency band is selected in order as specified user's frequency band, and this is specified into user's frequency band and referred to by program request
The designated television program information obtained in order is sent to low noise block downconverter as double conversion control command, finally by low noise
Select in the double conversion signal of sound low-converter output and decoded with the signal of the corresponding frequency range of program request instruction, referred to playing
Determine TV programme Chx.
So that DVB 1 receives designated television program Chx as an example, illustrate that the present invention applies above-mentioned low noise block downconverter
Satellite receiving system workflow：
When DVB 1 receives program request instruction of the user to designated television program Chx, by " DVB 1-
The path of 1-power divider of house cable-descending cable-coaxial cable interface-read port " is first to low noise down coversion
The microprocessor of device sends free subscriber frequency band querying command；Microprocessor is according to satellite television receiver communication protocol to the sky
Not busy user's frequency band querying command is decoded, and will inquire about obtained current idle user's frequency band Query Result according to satellite television
After receiver communication protocol is encoded into acknowledgement command, by " write port-signal amplification circuit-coaxial cable interface-descending
The path of cable-power divider-1-DVB of house cable 1 " is sent to DVB 1, DVB 1
According to the acknowledgement command received, one of free subscriber frequency band is selected from current idle user's frequency band in Query Result
As specified user's frequency band, and this is specified into user's frequency band and the designated television program information that is obtained in being instructed by program request is as two
Secondary VFC order is sent to low noise block downconverter, and the microprocessor of low noise block downconverter, which is controlled the double conversion, orders
After order decoding, microprocessor controls digital channel stacked switch from receiving polarised direction identical with designated television program Chx
300~2350MHz intermediate-freuqncy signals in core out frequency be IF=FREQ-10.04GHz, the designated television section with a width of BW2
Mesh intermediate-freuqncy signal exports, also, microprocessor calculates frequency LO=CFk+ IF, and it is LO=to control frequency multiplier PLL to produce frequency
CFk+ IF controllable local oscillation signal so that frequency mixer Mix by designated television program intermediate-freuqncy signal and controllable local oscillation signal be mixed into
Double conversion signal of the frequency between LO- (IF-0.5 × BW2) to LO- (IF+0.5 × BW2), due to the double conversion signal
Belong within the frequency range of k-th of user's frequency band, therefore which occupies k-th of user's frequency band, and by the double conversion signal
Pass sequentially through after digital analog converter DAC and bandpass filter through being exported by coaxial cable interface to DVB 1；Satellite reception
Select in the double conversion signal that machine 1 is exported by low noise block downconverter and solved with the signal of the corresponding frequency range of program request instruction
Code, to play designated television program Chx.
The present invention is not limited to above-mentioned embodiment, according to the above, according to the ordinary technical knowledge of this area
And customary means, under the premise of the above-mentioned basic fundamental thought of the present invention is not departed from, the present invention can also make other diversified forms
Equivalent modifications, replacement or change, all fall among protection scope of the present invention.Such as：The Ku wave band down coversions of the present invention are penetrated
Unipolar Ku wave bands down coversion radio frequency chip also can be selected in frequency chip IC 1, only sets a polarity to be penetrated with Ku wave band down coversions
The corresponding antenna probe of frequency chip, digital channel stacked switch are provided only with a polarity and Ku wave band down coversion radio frequency chip phases
Corresponding input, the input that antenna probe passes through two-stage low-noise amplifier LNA connection Ku wave band down coversion radio frequency chips IC1
10.7~12.75GHz satellite-signals of input are that Ku wave band Whole frequency bands satellite is believed by end, Ku wave bands down coversion radio frequency chip IC1
300~2350MHz intermediate frequencies letter is mixed into number with 10.40GHz local oscillation signals in a manner of satellite frequency subtracts 10.40GHz
Exported after number, Ku wave band down coversion radio frequency chips IC1 output end passes sequentially through an automatic gain amplifier and a modulus
The input of converter ADC connection digital channel stacked switch.
Claims (9)
- A kind of 1. low noise block downconverter used suitable for multiple-link satellite receiver, provided with antenna probe, low-noise amplifier (LNA) the Ku wave band down coversion radio frequency chips (IC1) of 10.40GHz local oscillation signals can, be produced and for leading to DVB The coaxial cable interface of letter, the antenna probe connect Ku wave band down coversions by low-noise amplifier described in two-stage (LNA) and penetrated The input of frequency chip (IC1)；The Ku wave bands down coversion radio frequency chip (IC1) believes 10.7~12.75GHz satellites of input Number with 10.40GHz local oscillation signals mixing into exporting after 300~2350MHz intermediate-freuqncy signals, it is characterised in that：Described is low Noise block down-converter is additionally provided with double conversion control circuit (IC2), bandpass filter, signal amplification circuit and for be described Ku wave band down coversion radio frequency chips (IC1) and the power circuit of double conversion control circuit (IC2) power supply；The double conversion control Circuit (IC2) processed is provided with automatic gain amplifier, analog-digital converter (ADC), digital channel stacked switch, frequency mixer (Mix), number Weighted-voltage D/A converter (DAC), the frequency multiplier (PLL) that controllable local oscillation signal can be produced and with satellite television receiver communication protocol compile The microprocessor of decoding function, the output end of the Ku wave bands down coversion radio frequency chip (IC1) pass sequentially through one it is described automatic Gain amplifier and an analog-digital converter (ADC) connect the input of the digital channel stacked switch, the mixing One input of device (Mix) connects the output end of the digital channel stacked switch, and another of the frequency mixer (Mix) is defeated Enter the output end that end connects the frequency multiplier (PLL), the output end of the frequency mixer (Mix) passes sequentially through the digital analog converter (DAC) coaxial cable interface is connected with bandpass filter, the read port of the microprocessor connects the coaxial cable and connect Mouthful, the write port of the microprocessor connects the coaxial cable interface, the microprocessor by the signal amplification circuit TV programme selection output end connect the control terminal of the digital channel stacked switch, the FREQUENCY CONTROL of the microprocessor is defeated Go out the control terminal that end connects the frequency multiplier (PLL)；The microprocessor is preset with N number of user's frequency band, and the microprocessor will include the coaxial cable in frequency range User's frequency band of interface output signal frequency is labeled as having taken user's frequency band and having removed having taken the out-of-band user's frequency of user Tape label is free subscriber frequency band, wherein, N number of user's frequency band averagely divided by total frequency acceptance band of DVB and Into N is the positive integer more than 1, and the bandwidth of each user's frequency band isBW0 defends to be described The total bandwidth of star receiver, spacing of the Δ BW between two neighboring user's frequency band, the center of k-th of user's frequency band Frequency CFk=(k-0.5) × BW1+ Δs BW+950MHz, k are positive integer and 1≤k≤N；The microprocessor can pass through read port Read the free subscriber frequency band querying command that the coaxial cable interface receives and can be sent by write port comprising current empty The acknowledgement command of not busy user's frequency band Query Result so that the acknowledgement command is passed through by institute after being amplified by the signal amplification circuit Coaxial cable interface output is stated, also, the microprocessor can read what the coaxial cable interface received by read port Double conversion control command, wherein, the double conversion control command, which includes, specifies user's frequency band and designated television program information, Specified user's frequency band is k-th in N number of user's frequency band and belongs to the current idle user frequency band inquiry knot One of fruit, the designated television program information include the centre frequency FREQ and bandwidth BW 2 of designated television program (Chx)；It is described Microprocessor can control digital channel stacked switch core out frequency from the 300~2350MHz intermediate-freuqncy signals received Rate is IF=FREQ-10.04GHz, the designated television program intermediate-freuqncy signal output with a width of BW2, and the microprocessor energy It is LO=CF to control the frequency multiplier (PLL) to produce frequencyk+ IF controllable local oscillation signal so that the frequency mixer (Mix) is by institute Designated television program intermediate-freuqncy signal is stated to be mixed into frequency in LO- (IF-0.5 × BW2) to LO- (IF+0.5 with controllable local oscillation signal × BW2) between double conversion signal, and the double conversion signal is passed sequentially through into the digital analog converter (DAC) and band logical Through being exported by the coaxial cable interface after wave filter.
- 2. low noise block downconverter according to claim 1, it is characterised in that：Described antenna probe includes vertical polarization Antenna probe and horizontally-polarized antenna probe, the Ku wave bands down coversion radio frequency chip (IC1) are bipolarity Ku wave band down coversions Radio frequency chip, the input of bipolarity Ku wave band down coversion radio frequency chips includes vertical polarization input and horizontal polarization inputs End, output end include vertical polarization output end and horizontal polarization output end, and the input of the digital channel stacked switch includes Vertical polarization input and horizontal polarization input；The vertical polarized antenna probe passes through low-noise amplifier described in two-stage (LNA) the vertical polarization input (IN1) of the bipolarity Ku wave bands down coversion radio frequency chip, the horizontally-polarized antenna are connected Probe connects the horizontal polarization of the bipolarity Ku wave bands down coversion radio frequency chip by low-noise amplifier described in two-stage (LNA) Input (IN2), the vertical polarization output end (OUT1) of the bipolarity Ku wave bands down coversion radio frequency chip pass sequentially through one The automatic gain amplifier and an analog-digital converter (ADC) connect the vertical polarization of the digital channel stacked switch Input, horizontal polarization output end (OUT2) pass sequentially through an automatic gain amplifier and an analog-digital converter (ADC) the horizontal polarization input of the digital channel stacked switch is connected；The bipolarity Ku wave bands down coversion radio frequency chip 10.7~12.75GHz vertical polarizations satellite-signal of input and the 10.40GHz local oscillation signals are mixed into vertical polarization After 300~2350MHz intermediate-freuqncy signals output, by 10.7~12.75GHz horizontal polarizations satellite-signal of input with it is described 10.40GHz local oscillation signals export after being mixed into 300~2350MHz intermediate-freuqncy signals of horizontal polarization；The designated television program letter Breath also includes the polarised direction of designated television program (Chx), the microprocessor can control the digital channel stacked switch from Core out frequency in 300~2350MHz intermediate-freuqncy signals of the polarised direction identical with the designated television program (Chx) received Rate is IF=FREQ-10.04GHz, the designated television program intermediate-freuqncy signal output with a width of BW2.
- 3. low noise block downconverter according to claim 1 or 2, it is characterised in that：The band of each user's frequency band Wide BW1 is all higher than the bandwidth BW 2 of any one of designated television program (Chx).
- 4. low noise block downconverter according to claim 3, it is characterised in that：The microprocessor is preset with N=24 User's frequency band, total frequency acceptance band of the DVB is between 950MHz~2150MHz, two neighboring user's frequency band Separation delta BW=4MHz, total bandwidth BW0=2150MHz-950MHz=1200MHz, the bandwidth of each user's frequency band
- 5. low noise block downconverter according to claim 4, it is characterised in that：The scope of the bandpass filter is 950- 2150MHz。
- 6. low noise block downconverter according to claim 1 or 2, it is characterised in that：Described low noise block downconverter is also Storage chip (Flash) provided with the execution software program for storing the microprocessor；The storage chip (Flash) with The respective pins connection of the microprocessor.
- 7. low noise block downconverter according to claim 1 or 2, it is characterised in that：The satellite television receiver communication Agreement is any one in DiSEqC 1.x agreements, DiSEqC 2.x agreements, EN50494 agreements and EN50607 agreements.
- 8. low noise block downconverter according to claim 1 or 2, it is characterised in that：Described coaxial cable interface is F heads Interface.
- A kind of 9. satellite receiving system, it is characterised in that：It is any that described satellite receiving system includes a claim 1 to 8 Low noise block downconverter, a power divider described in one and at most N platforms DVB, wherein, the power distribution Utensil has a main road port and tributary port at least equal with the DVB quantity, and N is to become under the low noise The default user's number of frequency bands of microprocessor in frequency device；The low noise block downconverter is installed outdoors, the power distribution Device and Ge Tai DVBs are installed in interior, and the coaxial cable interface of the low noise block downconverter passes through a downlink electrical Cable connects the main road port of the power divider, and each DVB is by described in a house cable connection The tributary port of power divider；The each DVB receives user to the designated television program (Chx) When program request instructs, first the free subscriber frequency band querying command is sent to the low noise block downconverter, then from the low noise One of free subscriber frequency band is selected in the acknowledgement command of sound low-converter feedback as specified user's frequency band, and this is specified User's frequency band and the designated television program information by being obtained in program request instruction are sent as the double conversion control command To the low noise block downconverter, selected in the double conversion signal finally exported by the low noise block downconverter and the point Broadcast and instruct the signal of corresponding frequency range to be decoded, to play the designated television program (Chx).
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| CN201610130767.5A CN105703788B (en) | 2016-03-08 | 2016-03-08 | The low noise block downconverter and satellite receiving system used suitable for multiple-link satellite receiver |
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| CN201610130767.5A CN105703788B (en) | 2016-03-08 | 2016-03-08 | The low noise block downconverter and satellite receiving system used suitable for multiple-link satellite receiver |
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| CN105703788B true CN105703788B (en) | 2017-12-12 |
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| CN106454169B (en) * | 2016-09-29 | 2023-05-12 | 珠海市普斯赛特科技有限公司 | Self-adaptive 22kHz audio signal generator and generation method thereof |
| CN109586815B (en) * | 2019-01-09 | 2021-08-10 | 成都爱科特科技发展有限公司 | Signal preset control method and system among multiple receiver devices |
| CN111314753B (en) * | 2019-12-27 | 2024-02-20 | 深圳市北斗万方信息技术有限公司 | Signal processing method, digital video conversion device and low noise down converter |
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| US6192217B1 (en) * | 1999-07-01 | 2001-02-20 | Assuresat, Inc. | Universal replacement communications satellite |
| CN101562485B (en) * | 2009-05-25 | 2013-05-08 | 北京航空航天大学 | Ku frequency band and multicarrier time-division multiple access satellite signal monitoring method |
| CN203800933U (en) * | 2014-05-08 | 2014-08-27 | 深圳翔成电子科技有限公司 | Wideband KU wave band dual output satellite down converter |
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