CN105703788A - Low-noise down-converter applied to multi-path satellite receiver, and satellite receiving system - Google Patents
Low-noise down-converter applied to multi-path satellite receiver, and satellite receiving system Download PDFInfo
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- CN105703788A CN105703788A CN201610130767.5A CN201610130767A CN105703788A CN 105703788 A CN105703788 A CN 105703788A CN 201610130767 A CN201610130767 A CN 201610130767A CN 105703788 A CN105703788 A CN 105703788A
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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 low-noise down-converter applied to a multi-path satellite receiver, and a satellite receiving system. The low-noise down-converter is pre-provided with N user frequency bands. Meanwhile, the frequencies of satellite signals, that are 10.7 to 12.75 GHz, are reduced to be 300-2350 MHz, so that the satellite signals are converted into IF signals through the frequency-reducing process. After that, IF signals corresponding to specified television programs in the specified television program information are picked out of the above IF signals of 300-2350 MHz in frequency. Then, the IF signals corresponding to the specified television programs are mixed with controllable intrinsic signals to be converted into secondary frequency-conversion signals, wherein the frequency range of the secondary frequency-conversion signals is within one idle user band frequency range of N user frequency bands. The N user frequency bands are formed through uniformly dividing a total receiving frequency band of the satellite receiver, and the frequencies of the controllable intrinsic signals are calculated based on the center frequencies of specified television programs and the center frequency of the above idle user band frequency. Finally, the secondary frequency-conversion signals are outputted via a coaxial cable interface. According to the technical scheme of the invention, at most N paths of mutually independent television program signals can be outputted at the same time. Meanwhile, the cable laying cost and the user installation cost are saved. Moreover, the installation complexity of a system outdoor part is lowered.
Description
Technical field
The present invention relates to a kind of low noise block downconverter used suitable in multiple-link satellite receiver, and, apply the satellite receiving system of this low noise block downconverter。
Background technology
In the low noise block downconverter circuit design of tradition Ku wave band, it is generally adopted two local frequencies of 9.75/10.60GHz, the 0/22KHz pulse signal that built-in 0/22KHz switches circuit, exported by satellite television receiver selects its local frequency low, high respectively, the satellite-signal simultaneously horizontally or vertically polarized with the 13/18V voltage switching of satellite television receiver, it is transferred to satellite television receiver, it is achieved Ku wave band program Whole frequency band receives by coaxial cable。But in traditional low noise block downconverter design, have employed two local frequencies of 9.75/10.60GHz, cause that circuit design becomes complicated, and add the testing time in process of production。And use owing to each delivery outlet of custom low noise low-converter is required for being connected to a satellite television receiver of indoor by single independent coaxial cable from open air, so make in the face of equipped with multiple satellite television receiver users, it is accomplished by the many descending cables of independence, even needs multiple low noise block downconverter。Add the complexity of installation, and need to pay significantly high cable laying cost, laid commercial user and the domestic consumer of cable simultaneously for those, it is necessary to again reequiping circuit, expensive, quantities is also very big。So in traditional low noise block downconverter circuit design, no matter being in plant design production process, or when needs meet multi-user's use, all there is many deficiencies。
Summary of the invention
The technical problem to be solved is: provide a kind of low noise block downconverter used suitable in multiple-link satellite receiver, and, apply the satellite receiving system of this low noise block downconverter。
Solving above-mentioned technical problem, the technical solution adopted in the present invention is as follows:
A kind of low noise block downconverter being suitable to the use of multiple-link satellite receiver, being provided with antenna probe, low-noise amplifier, the Ku wave band down coversion radio frequency chip that can produce 10.40GHz local oscillation signal and the coaxial cable interface for communicating with DVB, described antenna probe connects the input of Ku wave band down coversion radio frequency chip by low-noise amplifier described in two-stage；10.7～12.75GHz satellite-signal of input is mixed into after 300～2350MHz intermediate-freuqncy signal with described 10.40GHz local oscillation signal and exports by described Ku wave band down coversion radio frequency chip, it is characterised in that: described low noise block downconverter is additionally provided with double conversion control circuit, band filter, signal amplification circuit and the power circuit for powering for described Ku wave band down coversion radio frequency chip and double conversion control circuit；Described double conversion control circuit is provided with automatic gain amplifier, analog-digital converter, digital channel stacked switch, frequency mixer, digital to analog converter, the doubler of controlled local oscillation signal can be produced and there is the microprocessor of satellite television receiver communication protocol codec functions, the outfan of described Ku wave band down coversion radio frequency chip passes sequentially through a described automatic gain amplifier and the input of a described analog-digital converter described digital channel stacked switch of connection, one input of described frequency mixer connects the outfan of described digital channel stacked switch, another input connects the outfan of described doubler, outfan passes sequentially through described digital to analog converter and band filter connects described coaxial cable interface, the read port of described microprocessor connects described coaxial cable interface, write port connects described coaxial cable interface by described signal amplification circuit, TV programme select outfan to connect the control end of described digital channel stacked switch, FREQUENCY CONTROL outfan connects the control end of described doubler；
Described microprocessor is preset with N number of user's frequency band, the user's frequency band including described coaxial cable interface output signal frequency in frequency range is labeled as and takies user's frequency band and will be labeled as free subscriber frequency band except taking the out-of-band user's frequency band of user by described microprocessor, wherein, described N number of user's frequency band is on average divided by total frequency acceptance band of DVB and forms, N is the positive integer more than 1, and the bandwidth of each described user's frequency band isBW0 is the total bandwidth of described DVB, and Δ BW is the spacing between adjacent two described user's frequency bands, the mid frequency CF of user's frequency band described in kthk=(k-0.5) × BW1+ Δ BW+950MHz, k are positive integer and 1≤k≤N；Described microprocessor can be read, by read port, free subscriber frequency band querying command that described coaxial cable interface receives and can be sent the acknowledgement command comprising current idle user's frequency band Query Result by write port, through being exported by described coaxial cable interface after making described acknowledgement command be amplified by described signal amplification circuit, and, described microprocessor can read, by read port, the double conversion control command that described coaxial cable interface receives, wherein, described double conversion control command comprises appointment user's frequency band and designated television programme information, described appointment user's frequency band is the kth in described N number of user's frequency band and belongs to one of described current idle user's frequency band Query Result, described designated television programme information includes mid frequency FREQ and the bandwidth BW 2 of designated television program；Described microprocessor can control described digital channel stacked switch core out frequency from the 300～2350MHz intermediate-freuqncy signal received to be IF=FREQ-10.04GHz, bandwidth be the designated television program intermediate-freuqncy signal output of BW2, and described microprocessor to control described doubler generation frequency be LO=CFkThe controlled local oscillation signal of+IF, make described frequency mixer that described designated television program intermediate-freuqncy signal be mixed into frequency double conversion signal between LO-(IF-0.5 × BW2) to LO-(IF+0.5 × BW2) with controlled local oscillation signal, and through being exported by described coaxial cable interface after this double conversion signal is passed sequentially through described digital to analog converter and band filter。
As one embodiment of the present invention, described antenna probe includes vertical polarized antenna probe and horizontally-polarized antenna probe, described Ku wave band down coversion radio frequency chip is bipolarity Ku wave band down coversion radio frequency chip, the input of this bipolarity Ku wave band down coversion radio frequency chip includes vertical polarization input and horizontal polarization input, outfan include vertical polarization outfan and horizontal polarization outfan, and the input of described digital channel stacked switch includes vertical polarization input and horizontal polarization input；Described vertical polarized antenna probe connects the vertical polarization input of described bipolarity Ku wave band down coversion radio frequency chip by low-noise amplifier described in two-stage, described horizontally-polarized antenna probe connects the horizontal polarization input of described bipolarity Ku wave band down coversion radio frequency chip by low-noise amplifier described in two-stage, the vertical polarization outfan of described bipolarity Ku wave band down coversion radio frequency chip passes sequentially through a described automatic gain amplifier and the vertical polarization input of a described analog-digital converter described digital channel stacked switch of connection, horizontal polarization outfan passes sequentially through a described automatic gain amplifier and the horizontal polarization input of a described analog-digital converter described digital channel stacked switch of connection；Described bipolarity Ku wave band down coversion radio frequency chip 10.7～12.75GHz vertical polarization satellite-signal of input is mixed into 300～2350MHz intermediate-freuqncy signal of vertical polarization with described 10.40GHz local oscillation signal after output, 10.7～12.75GHz horizontal polarization satellite-signal of input is mixed into described 10.40GHz local oscillation signal 300～2350MHz intermediate-freuqncy signal of horizontal polarization after export；Described designated television programme information also includes the polarised direction of designated television program, and described microprocessor can control described digital channel stacked switch from the designated television program intermediate-freuqncy signal output with to be IF=FREQ-10.04GHz, bandwidth the be BW2 of core out frequency 300～2350MHz intermediate-freuqncy signal in described designated television program equipolarization direction received。
Satellite television programming dropout data in order to avoid low noise block downconverter output, guarantee that DVB receives the stability of TV programme signal, as the preferred embodiment of the present invention, the bandwidth BW 1 of each described user's frequency band is all higher than the bandwidth BW 2 of any one of designated television program。
Consider the performance of existing DVB, and guarantee BW1 > BW2, as the preferred embodiment of the present invention, described microprocessor is preset with N=24 user's frequency band, total frequency acceptance band of described DVB is separation delta BW=4MHz, the total bandwidth BW0=2150MHz-950MHz=1200MHz between 950MHz～2150MHz, adjacent two described user's frequency bands, the bandwidth of each described user's frequency band
Described band filter range for 950-2150MHz。
As one embodiment of the present invention, described low noise block downconverter is additionally provided with the storage chip performing software program for storing described microprocessor；Described storage chip is connected with the respective pins of described microprocessor。
As one embodiment of the present invention, described satellite television receiver communication protocol is any one in DiSEqC1.x agreement, DiSEqC2.x agreement, EN50494 agreement and EN50607 agreement。
As one embodiment of the present invention, described coaxial cable interface is F head interface。
A kind of satellite receiving system, it is characterized in that: described satellite receiving system includes the low noise block downconverter described in claim 1 to 8 any one, a power divider and at most N platform DVB, wherein, described power divider has a main road port and at least equal with described DVB quantity tributary port, and N is user's number of frequency bands that the microprocessor in described low noise block downconverter is preset；Described low noise block downconverter is arranged on outdoor, described power divider and Ge Tai DVB are installed in indoor, the coaxial cable interface of described low noise block downconverter connects the main road port of described power divider by a descending cable, and each described DVB connects the tributary port of described power divider each through a house cable；When each described DVB receives user to the program request instruction of described designated television program, all first send described free subscriber frequency band querying command to described low noise block downconverter, one of them free subscriber frequency band is selected again as specifying user's frequency band from the acknowledgement command that described low noise block downconverter is fed back, and using this appointment user's frequency band and by described program request instruction obtain designated television programme information be sent to described low noise block downconverter as described double conversion control command, the signal selecting frequency range corresponding with described program request instruction in the last double conversion signal exported by described low noise block downconverter is decoded, to play described designated television program。
Compared with prior art, the method have the advantages that
First, the low noise block downconverter of the present invention is preset with N number of user's frequency band, and be first 300～2350MHz intermediate-freuqncy signal by 10.7～12.75GHz satellite-signal frequency reducing, then by 300～2350MHz intermediate-freuqncy signal is selected the designated television program intermediate-freuqncy signal corresponding to designated television programme information, again designated television program intermediate-freuqncy signal and controlled local oscillation signal are mixed down the double conversion signal in frequency range one of them free subscriber passband frequency range in N number of user's frequency band, wherein, N number of user's frequency band is on average divided by total frequency acceptance band of DVB and forms, the frequency of controlled local oscillation signal is calculated obtained by the mid frequency FREQ of designated television program and the mid frequency of aforementioned free user's frequency band, last again by coaxial cable interface output double conversion signal, therefore, the low noise block downconverter of the present invention can export the TV programme signal of N road independence at most simultaneously, each road TV programme signal is carried on user's frequency band, each road TV programme signal does not interfere with each other each other。
Second, according to the performance of existing DVB, and guaranteeing that DVB receives under the premise that TV programme signal is stably BW1 > BW2, the low noise block downconverter of the present invention at most can export the TV programme signal of 24 tunnel independences simultaneously。
3rd, the satellite receiving system of the present invention adopts above-mentioned low noise block downconverter, can at most simultaneously to the TV programme signal that the output of N platform DVB is independent, and, when the satellite receiving system of the present invention is installed, only need an above-mentioned low noise block downconverter is arranged on outdoor, one power divider and N platform DVB are arranged on indoor, can complete to connect with the house cable that the length of the longer descending cable of the length of the outer low noise block downconverter of a junction chamber and indoor power allotter and N root junction chamber internal power allotter and indoor DVB is shorter again, the descending cable that N-1 root length degree is longer is saved compared to existing satellite receiving system, therefore, the satellite receiving system of the present invention can simultaneously for N number of user independently from, and can greatly save cable laying cost and user installation cost, reduce the installation complexity of system chambers outer portion。
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail:
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 and includes n satellite television programming Ch1～Chn in 10.7～12.75GHz satellite-signal altogether, Chx represents that user specifies the designated television program received, the trapezoidal wire frame representation frequency band to induction signal from n satellite television programming；
Fig. 3 is the schematic block circuit diagram of the satellite receiving system of the present invention。
Detailed description of the invention
As depicted in figs. 1 and 2, the present invention is applicable to the low noise block downconverter that multiple-link satellite receiver uses, it is provided with vertical polarized antenna probe, horizontally-polarized antenna probe, low-noise amplifier LNA, the Ku wave band down coversion radio frequency chip IC1 of 10.40GHz local oscillation signal can be produced, double conversion control circuit IC2, band filter, signal amplification circuit, the storage chip Flash performing software program for storage microprocessor, for with the coaxial cable interface of DVB communication and for for Ku wave band down coversion radio frequency chip IC1 and the double conversion control circuit IC2 power circuit powered。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 analog converter DAC, can produce the doubler PLL of controlled local oscillation signal and have the microprocessor of satellite television receiver communication protocol codec functions；Ku wave band down coversion radio frequency chip IC1 is bipolarity Ku wave band down coversion radio frequency chip, this bipolarity Ku wave band down coversion radio frequency chip has vertical polarization input, horizontal polarization input, vertical polarization outfan and horizontal polarization outfan, and digital channel stacked switch has vertical polarization input and horizontal polarization input。
Above-mentioned vertical polarized antenna probe connects the vertical polarization input IN1 of bipolarity Ku wave band down coversion radio frequency chip by two-stage low-noise amplifier LNA, horizontally-polarized antenna probe connects the horizontal polarization input IN2 of bipolarity Ku wave band down coversion radio frequency chip by two-stage low-noise amplifier LNA, the vertical polarization outfan OUT1 of bipolarity Ku wave band down coversion radio frequency chip passes sequentially through an automatic gain amplifier and the vertical polarization input of an analog-digital converter ADC connection digital channel stacked switch, horizontal polarization outfan OUT2 passes sequentially through an automatic gain amplifier and the horizontal polarization input of an analog-digital converter ADC connection digital channel stacked switch；10.7～12.75GHz vertical polarization satellite-signal of input is exported after the 300～2350MHz intermediate-freuqncy signal being mixed into vertical polarization in the way of satellite frequency deducts 10.40GHz with 10.40GHz local oscillation signal, is exported after the 300～2350MHz intermediate-freuqncy signal being mixed into horizontal polarization in the way of satellite frequency deducts 10.40GHz with 10.40GHz local oscillation signal by 10.7～12.75GHz horizontal polarization satellite-signal of input by bipolarity Ku wave band down coversion radio frequency chip。
One input connection outfan of digital channel stacked switch of above-mentioned frequency mixer Mix, another input connection outfan of doubler PLL, outfan pass sequentially through digital to analog converter DAC and band filter connecting coaxial cable interface, and the read port connecting coaxial cable interface of microprocessor, write port select the control end of the control end of outfan connection digital channel stacked switch, FREQUENCY CONTROL outfan connection doubler PLL by signal amplification circuit connecting coaxial cable interface, TV programme；Storage chip Flash is connected with the respective pins of microprocessor。
Above-mentioned microprocessor is preset with N number of user's frequency band, the user's frequency band including coaxial cable interface output signal frequency in frequency range is labeled as and takies user's frequency band and will be labeled as free subscriber frequency band except taking the out-of-band user's frequency band of user by microprocessor, wherein, N number of user's frequency band is on average divided by total frequency acceptance band of DVB and forms, N is the positive integer more than 1, and the bandwidth of each user's frequency band isBW0 is the total bandwidth of DVB, and Δ BW is the spacing between adjacent two described user's frequency bands, the mid frequency CF of kth user's frequency bandk=(k-0.5) × BW1+ Δ BW+950MHz, k are positive integer and 1≤k≤N；Microprocessor can be read the free subscriber frequency band querying command that receives of coaxial cable interface by read port and can be sent the acknowledgement command comprising current idle user's frequency band Query Result by write port, through being exported by coaxial cable interface after making acknowledgement command be amplified by signal amplification circuit, and, microprocessor can read, by read port, the double conversion control command that coaxial cable interface receives, wherein, double conversion control command comprises appointment user's frequency band and designated television programme information, user's frequency band is specified to be the kth in N number of user's frequency band and belong to one of current idle user's frequency band Query Result, designated television programme information includes the polarised direction of designated television program Chx, mid frequency FREQ and bandwidth BW 2；Microprocessor can control digital channel stacked switch from the designated television program intermediate-freuqncy signal output with to be IF=FREQ-10.04GHz, bandwidth the be BW2 of core out frequency 300～2350MHz intermediate-freuqncy signal in designated television program Chx equipolarization direction received, and microprocessor can control doubler PLL, and to produce frequency be LO=CFkThe controlled local oscillation signal of+IF, make frequency mixer Mix that designated television program intermediate-freuqncy signal be mixed into frequency double conversion signal between LO-(IF-0.5 × BW2) to LO-(IF+0.5 × BW2) with controlled local oscillation signal, owing to this double conversion signal belongs within the frequency range of kth user's frequency band, therefore which occupies kth user's frequency band, and through being exported by coaxial cable interface after this double conversion signal is passed sequentially through digital to analog converter DAC and band filter。
Wherein, above-mentioned satellite television receiver communication protocol is any one in DiSEqC1.x agreement, DiSEqC2.x agreement, EN50494 agreement and EN50607 agreement。Coaxial cable interface is preferably F head interface。
Satellite television programming dropout data in order to avoid low noise block downconverter output, it is ensured that DVB receives the stability of TV programme signal, and the bandwidth BW 1 of each user's frequency band above-mentioned is all higher than the bandwidth BW 2 of any one designated television program Chx。
Consider the performance of existing DVB, and guarantee BW1 > BW2, above-mentioned microprocessor is preset with N=24 user's frequency band, total frequency acceptance band of DVB is 950MHz～2150MHz, total bandwidth BW0=2150MHz-950MHz=1200MHz, separation delta BW=4MHz between adjacent two user's frequency bands, the bandwidth of each user's frequency bandAccordingly, band filter range for 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 divider and at most N platform DVB, wherein, power divider has a main road port and at least equal with DVB quantity tributary port, and N is user's number of frequency bands that the microprocessor in low noise block downconverter is preset。Low noise block downconverter is arranged on outdoor, power divider and Ge Tai DVB are installed in indoor, the coaxial cable interface of low noise block downconverter connects the main road port of power divider by a descending cable, and each DVB connects the tributary port of power divider each through a house cable；When each DVB receives user to the program request instruction of designated television program Chx, all first send free subscriber frequency band querying command to low noise block downconverter, one of them free subscriber frequency band is selected again as specifying user's frequency band from the acknowledgement command of low noise block downconverter feedback, and using this appointment user's frequency band and by program request instruction obtain designated television programme information be sent to low noise block downconverter as double conversion control command, the signal selecting frequency range corresponding with program request instruction in the last double conversion signal exported by low noise block downconverter is decoded, to play designated television program Chx。
Receive designated television program Chx for DVB 1, illustrate that the present invention applies the workflow of the satellite receiving system of above-mentioned low noise block downconverter:
When DVB 1 receives user to the program request instruction of designated television program Chx, first send free subscriber frequency band querying command to the microprocessor of low noise block downconverter through the path of " the descending cable coaxial cable interface read port of DVB 1 house cable 1 power divider "；This free subscriber frequency band querying command is decoded by microprocessor according to satellite television receiver communication protocol, and after current idle user's frequency band Query Result that inquiry obtains is encoded into acknowledgement command according to satellite television receiver communication protocol, it is sent to DVB 1 through the path of " descending cable power divider house cable 1 DVB 1 of write port signal amplification circuit coaxial cable interface ", DVB 1 is according to the acknowledgement command received, current idle user's frequency band from Query Result is selected one of them free subscriber frequency band as specifying user's frequency band, and using this appointment user's frequency band and by program request instruction obtain designated television programme information be sent to low noise block downconverter as double conversion control command, after this double conversion control command is decoded by the microprocessor of low noise block downconverter, it is IF=FREQ-10.04GHz from what receive with core out frequency 300～2350MHz intermediate-freuqncy signal in designated television program Chx equipolarization direction that microprocessor controls digital channel stacked switch, bandwidth is the designated television program intermediate-freuqncy signal output of BW2, and, microprocessor calculates frequency LO=CFk+ IF, and control doubler PLL produce frequency be LO=CFkThe controlled local oscillation signal of+IF, make frequency mixer Mix that designated television program intermediate-freuqncy signal be mixed into frequency double conversion signal between LO-(IF-0.5 × BW2) to LO-(IF+0.5 × BW2) with controlled local oscillation signal, owing to this double conversion signal belongs within the frequency range of kth user's frequency band, therefore which occupies kth user's frequency band, and through being exported to DVB 1 by coaxial cable interface after this double conversion signal is passed sequentially through digital to analog converter DAC and band filter；The signal selecting frequency range corresponding with program request instruction by low noise block downconverter in the double conversion signal that DVB 1 is exported is decoded, to play designated television program Chx。
The present invention is not limited to above-mentioned detailed description of the invention; according to foregoing; ordinary technical knowledge and customary means according to this area; without departing under the above-mentioned basic fundamental thought premise of the present invention; the present invention can also make the equivalent modifications of other various ways, replacement or change, all falls among protection scope of the present invention。Such as: the Ku wave band down coversion radio frequency chip IC1 of the present invention also can be selected for unipolar Ku wave band down coversion radio frequency chip, the antenna probe that a piece polarity is corresponding with Ku wave band down coversion radio frequency chip is only set, digital channel stacked switch is provided only with the input that a polarity is corresponding with Ku wave band down coversion radio frequency chip, antenna probe connects the input of Ku wave band down coversion radio frequency chip IC1 by two-stage low-noise amplifier LNA, 10.7～12.75GHz satellite-signal and the Ku wave band Whole frequency band satellite-signal of input are exported by Ku wave band down coversion radio frequency chip IC1 with 10.40GHz local oscillation signal after being mixed into 300～2350MHz intermediate-freuqncy signal in the way of satellite frequency deducts 10.40GHz, the outfan of Ku wave band down coversion radio frequency chip IC1 passes sequentially through an automatic gain amplifier and the input of an analog-digital converter ADC connection digital channel stacked switch。
Claims (9)
1. one kind is suitable to the low noise block downconverter that multiple-link satellite receiver uses, being provided with antenna probe, low-noise amplifier (LNA), Ku wave band down coversion radio frequency chip (IC1) that can produce 10.40GHz local oscillation signal and the coaxial cable interface for communicating with DVB, described antenna probe connects the input of Ku wave band down coversion radio frequency chip (IC1) by low-noise amplifier (LNA) described in two-stage；10.7～12.75GHz satellite-signal of input is mixed into after 300～2350MHz intermediate-freuqncy signal with described 10.40GHz local oscillation signal and exports by described Ku wave band down coversion radio frequency chip (IC1), it is characterised in that: described low noise block downconverter is additionally provided with double conversion control circuit (IC2), band filter, signal amplification circuit and the power circuit for powering for described Ku wave band down coversion radio frequency chip (IC1) and double conversion control circuit (IC2)；Described double conversion control circuit (IC2) is provided with automatic gain amplifier, analog-digital converter (ADC), digital channel stacked switch, frequency mixer (Mix), digital to analog converter (DAC), the doubler (PLL) of controlled local oscillation signal can be produced and there is the microprocessor of satellite television receiver communication protocol codec functions, the outfan of described Ku wave band down coversion radio frequency chip (IC1) passes sequentially through a described automatic gain amplifier and described analog-digital converter (ADC) connects the input of described digital channel stacked switch, one input of described frequency mixer (Mix) connects the outfan of described digital channel stacked switch, another input connects the outfan of described doubler (PLL), outfan passes sequentially through described digital to analog converter (DAC) and band filter connects described coaxial cable interface, the read port of described microprocessor connects described coaxial cable interface, write port connects described coaxial cable interface by described signal amplification circuit, TV programme select outfan to connect the control end of described digital channel stacked switch, FREQUENCY CONTROL outfan connects the control end of described doubler (PLL)；
Described microprocessor is preset with N number of user's frequency band, the user's frequency band including described coaxial cable interface output signal frequency in frequency range is labeled as and takies user's frequency band and will be labeled as free subscriber frequency band except taking the out-of-band user's frequency band of user by described microprocessor, wherein, described N number of user's frequency band is on average divided by total frequency acceptance band of DVB and forms, N is the positive integer more than 1, and the bandwidth of each described user's frequency band isBW0 is the total bandwidth of described DVB, and Δ BW is the spacing between adjacent two described user's frequency bands, the mid frequency CF of user's frequency band described in kthk=(k-0.5) × BW1+ Δ BW+950MHz, k are positive integer and 1≤k≤N；Described microprocessor can be read, by read port, free subscriber frequency band querying command that described coaxial cable interface receives and can be sent the acknowledgement command comprising current idle user's frequency band Query Result by write port, through being exported by described coaxial cable interface after making described acknowledgement command be amplified by described signal amplification circuit, and, described microprocessor can read, by read port, the double conversion control command that described coaxial cable interface receives, wherein, described double conversion control command comprises appointment user's frequency band and designated television programme information, described appointment user's frequency band is the kth in described N number of user's frequency band and belongs to one of described current idle user's frequency band Query Result, described designated television programme information includes mid frequency FREQ and the bandwidth BW 2 of designated television program (Chx)；Described microprocessor can control described digital channel stacked switch core out frequency from the 300～2350MHz intermediate-freuqncy signal received to be IF=FREQ-10.04GHz, bandwidth be the designated television program intermediate-freuqncy signal output of BW2, and described microprocessor can control described doubler (PLL), and to produce frequency be LO=CFkThe controlled local oscillation signal of+IF, make described frequency mixer (Mix) that described designated television program intermediate-freuqncy signal be mixed into frequency double conversion signal between LO-(IF-0.5 × BW2) to LO-(IF+0.5 × BW2) with controlled local oscillation signal, and through being exported by described coaxial cable interface after this double conversion signal is passed sequentially through described digital to analog converter (DAC) and band filter。
2. low noise block downconverter according to claim 1, it is characterized in that: described antenna probe includes vertical polarized antenna probe and horizontally-polarized antenna probe, described Ku wave band down coversion radio frequency chip (IC1) is bipolarity Ku wave band down coversion radio frequency chip, the input of this bipolarity Ku wave band down coversion radio frequency chip includes vertical polarization input and horizontal polarization input, outfan include vertical polarization outfan and horizontal polarization outfan, and the input of described digital channel stacked switch includes vertical polarization input and horizontal polarization input；Described vertical polarized antenna probe connects the vertical polarization input (IN1) of described bipolarity Ku wave band down coversion radio frequency chip by low-noise amplifier (LNA) described in two-stage, described horizontally-polarized antenna probe connects the horizontal polarization input (IN2) of described bipolarity Ku wave band down coversion radio frequency chip by low-noise amplifier (LNA) described in two-stage, the vertical polarization outfan (OUT1) of described bipolarity Ku wave band down coversion radio frequency chip passes sequentially through a described automatic gain amplifier and described analog-digital converter (ADC) connects the vertical polarization input of described digital channel stacked switch, horizontal polarization outfan (OUT2) passes sequentially through a described automatic gain amplifier and described analog-digital converter (ADC) connects the horizontal polarization input of described digital channel stacked switch；Described bipolarity Ku wave band down coversion radio frequency chip 10.7～12.75GHz vertical polarization satellite-signal of input is mixed into 300～2350MHz intermediate-freuqncy signal of vertical polarization with described 10.40GHz local oscillation signal after output, 10.7～12.75GHz horizontal polarization satellite-signal of input is mixed into described 10.40GHz local oscillation signal 300～2350MHz intermediate-freuqncy signal of horizontal polarization after export；Described designated television programme information also includes the polarised direction of designated television program (Chx), and described microprocessor can control described digital channel stacked switch from the designated television program intermediate-freuqncy signal output with to be IF=FREQ-10.04GHz, bandwidth the be BW2 of core out frequency 300～2350MHz intermediate-freuqncy signal in described designated television program (Chx) equipolarization direction received。
3. low noise block downconverter according to claim 1 and 2, it is characterised in that: the bandwidth BW 1 of each described user's frequency band 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 characterized in that: described microprocessor is preset with N=24 user's frequency band, total frequency acceptance band of described DVB is separation delta BW=4MHz, the total bandwidth BW0=2150MHz-950MHz=1200MHz between 950MHz～2150MHz, adjacent two described user's frequency bands, the bandwidth of each described user's frequency band
5. low noise block downconverter according to claim 4, it is characterised in that: described band filter range for 950-2150MHz。
6. low noise block downconverter according to claim 1 and 2, it is characterised in that: described low noise block downconverter is additionally provided with the storage chip (Flash) performing software program for storing described microprocessor；Described storage chip (Flash) is connected with the respective pins of described microprocessor。
7. low noise block downconverter according to claim 1 and 2, it is characterised in that: described satellite television receiver communication protocol is any one in DiSEqC1.x agreement, DiSEqC2.x agreement, EN50494 agreement and EN50607 agreement。
8. low noise block downconverter according to claim 1 and 2, it is characterised in that: described coaxial cable interface is F head interface。
9. a satellite receiving system, it is characterized in that: described satellite receiving system includes the low noise block downconverter described in claim 1 to 8 any one, a power divider and at most N platform DVB, wherein, described power divider has a main road port and at least equal with described DVB quantity tributary port, and N is user's number of frequency bands that the microprocessor in described low noise block downconverter is preset；Described low noise block downconverter is arranged on outdoor, described power divider and Ge Tai DVB are installed in indoor, the coaxial cable interface of described low noise block downconverter connects the main road port of described power divider by a descending cable, and each described DVB connects the tributary port of described power divider each through a house cable；When each described DVB receives user to the program request instruction of described designated television program (Chx), all first send described free subscriber frequency band querying command to described low noise block downconverter, one of them free subscriber frequency band is selected again as specifying user's frequency band from the acknowledgement command that described low noise block downconverter is fed back, and using this appointment user's frequency band and by described program request instruction obtain designated television programme information be sent to described low noise block downconverter as described double conversion control command, the signal selecting frequency range corresponding with described program request instruction in the last double conversion signal exported by described low noise block downconverter is decoded, to play described designated television program (Chx)。
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| CN111314753A (en) * | 2019-12-27 | 2020-06-19 | 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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| CN109586815A (en) * | 2019-01-09 | 2019-04-05 | 成都爱科特科技发展有限公司 | Method and system are kept in a kind of signal setting control between more receiver devices |
| 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 |
| CN111314753A (en) * | 2019-12-27 | 2020-06-19 | 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 |
| 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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