CN204392229U - For the radio-frequency (RF) front-end circuit of broadband satellite signal monitoring - Google Patents
For the radio-frequency (RF) front-end circuit of broadband satellite signal monitoring Download PDFInfo
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- CN204392229U CN204392229U CN201420806836.6U CN201420806836U CN204392229U CN 204392229 U CN204392229 U CN 204392229U CN 201420806836 U CN201420806836 U CN 201420806836U CN 204392229 U CN204392229 U CN 204392229U
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Abstract
The utility model provides a kind of radio-frequency (RF) front-end circuit for broadband satellite signal monitoring, comprises simulated power testing circuit, double conversion circuit and programme-controlled gain circuit, and circuit space separation chamber; Described simulated power testing circuit comprises the digital thresholding comparison circuit and logarithmic detector that connect successively; Described double conversion circuit comprises the variable local oscillator mixting circuit, the first frequency mixer, the first band pass filter, the second band pass filter, the second frequency mixer, fixing local oscillator mixting circuit and the 3rd band pass filter that connect successively; Described programme-controlled gain circuit comprises the first numerical-control attenuator, the first fixing amplifier and the second fixing amplifier that connect successively, and the described second fixing amplifier is connected with described 3rd band pass filter; Described logarithmic detector is connected with described first frequency mixer, and described second frequency mixer is connected with described first numerical-control attenuator.The utility model circuit structure is simple, and cost is lower, automatically can carry out gain control to satellite-signal.
Description
Technical field
The utility model relates to radio-frequency front-end technical field, particularly relates to a kind of radio-frequency (RF) front-end circuit for broadband satellite signal monitoring.
Background technology
Along with China constantly strengthens in the comprehensive strength of high-technology field, utilizable satellite in orbit quantity gets more and more, satellite repeater capacity is increasing, satellite communication applications increasing extent is wide, and thing followed problem is, owing to there is a large amount of communication terminals, effective utilization of satellite repeater is had higher requirement, if frequency spectrum resource distribution uses unreasonable, easily formed between communication terminal and mutually disturb, reduce the reliability and stability of communication.Satellite communication subscriber needs a kind of effective satellite frequency spectrum monitoring means, grasps transponder spectrum occupancy on satellite, and accurately application uses satellite repeater frequency resource, improves satellite frequency resource utilization.
Current satellite communication field carries out the technical way of satellite channel spectrum monitoring, mainly adopts spectrum analyzer, and the shortcoming of this type of spectrum analyzer is that cost is higher, and instrument device architecture is complicated.
Utility model content
Based on this, the utility model provides a kind of radio-frequency (RF) front-end circuit for broadband satellite signal monitoring, and this radio-frequency (RF) front-end circuit structure is simple, and cost is lower, automatically can carry out gain control to satellite-signal.
For a radio-frequency (RF) front-end circuit for broadband satellite signal monitoring, comprise simulated power testing circuit, double conversion circuit and programme-controlled gain circuit, and circuit space separation chamber;
Described simulated power testing circuit comprises the digital thresholding comparison circuit and logarithmic detector that connect successively;
Described double conversion circuit comprises variable local oscillator mixting circuit, the first frequency mixer, the first band pass filter, the second band pass filter, the second frequency mixer and the fixing local oscillator mixting circuit and the 3rd band pass filter that connect successively;
Described programme-controlled gain circuit comprises the first numerical-control attenuator, the first fixing amplifier and the second fixing amplifier that connect successively;
Described logarithmic detector is connected with described first frequency mixer, and described second frequency mixer is connected with described first numerical-control attenuator, and the described second fixing amplifier is connected with described 3rd band pass filter; ;
Described circuit space separation chamber comprises the first cavity, isolates the variable local oscillation circuit in described double conversion circuit and the first frequency mixer; Comprise the second cavity, isolate the first band pass filter in described double conversion circuit and the second band pass filter; Comprise the 3rd cavity, isolate the second frequency mixer in described double conversion circuit, fixing local oscillation circuit and the 3rd band pass filter, and the first numerical-control attenuator, the first fixing amplifier and the second fixing amplifier in described programme-controlled gain circuit.
The above-mentioned radio-frequency (RF) front-end circuit for satellite-signal monitoring, simulated power testing circuit can detect the power of digital signal, the thresholding corresponding different to different signal powers, and comparative result is as the adjustment foundation of programme-controlled gain circuit; By variable local oscillator mixting circuit and fixing local oscillator mixting circuit, satellite RF signal is transformed to the low intermediate frequency signal of fixed frequency in double conversion circuit, the numerical-control attenuator in programme-controlled gain circuit can adjust gain values, realizes controlling the gain of signal.Circuit volume of the present utility model is little, cost is low, cost performance is high, has wide market application foreground.
Accompanying drawing explanation
Fig. 1 is the radio-frequency (RF) front-end circuit structural representation in a preferred embodiment that the utility model is monitored for satellite-signal.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the utility model is described in further detail, but execution mode of the present utility model is not limited thereto.
As shown in Figure 1, be the radio-frequency (RF) front-end circuit structural representation in a preferred embodiment that the utility model is monitored for satellite-signal, comprise:
Comprise simulated power testing circuit, double conversion circuit and programme-controlled gain circuit, and circuit space separation chamber;
Described simulated power testing circuit comprises the digital thresholding comparison circuit (V1, V2 and V3) and logarithmic detector 111 that connect successively;
Described double conversion circuit comprises the variable local oscillation circuit LO1, the first frequency mixer 121, first band pass filter 122, second band pass filter 123, second frequency mixer 124, fixing local oscillation circuit LO2 and the 3rd band pass filter 134 that connect successively;
Described programme-controlled gain circuit comprises the fixing amplifier of the first numerical-control attenuator 131, first 132 and the second fixing amplifier 133 that connect successively;
Described logarithmic detector 111 is connected with described first frequency mixer 121 by power splitter 10, and described second frequency mixer 124 is connected with described first numerical-control attenuator 131, and the described second fixing amplifier 133 is connected with described 3rd band pass filter 134;
Described circuit space separation chamber comprises the first cavity, isolates the variable local oscillation circuit LO1 in described double conversion circuit and the first frequency mixer 121; Comprise the second cavity, isolate the first band pass filter 122 and the second band pass filter 123 in described double conversion circuit; Comprise the 3rd cavity, isolate the second frequency mixer 124 in described double conversion circuit, fixing local oscillation circuit LO2 and the 3rd band pass filter 134, and amplifier 133 fixed by the fixing amplifier 132 and second of the first numerical-control attenuator 131, first in described programme-controlled gain circuit.
In the present embodiment, modules in foregoing circuit can be arranged in multiple independently cavity, is isolated by the space of cavity, prevents to efficiency the radiation of signal in space and crosstalk, eliminate and inhibit various intermodulation spuious, ensureing and improve circuit performance index.
Wherein, the radiofrequency signal of satellite is accessed by power splitter 10, power splitter 10 is connected with simulated power testing circuit, by digital thresholding comparison circuit (V1, V2 and V3), different threshold values is set, the thresholding that different signal powers is corresponding different, actual detection signal power compared with threshold power after result represent with binary digit, as decay adjustment foundation, circuit is responsible for the signal power measuring and adjustation of large bandwidth scope.
Power splitter 10 has also accessed double conversion circuit, in double conversion circuit, variable local oscillation circuit LO1 and the first frequency mixer 121 form variable local oscillator mixting circuit, second frequency mixer 124 and fixing local oscillation circuit LO2 form fixing local oscillator mixting circuit, the radiofrequency signal of 950-1750MHz is first transformed to the high intermediate-freuqncy signal of a certain fixed frequency by variable local oscillator mixting circuit, high intermediate-freuqncy signal is transformed to the low intermediate frequency signal of 70MHz by fixing local oscillator mixting circuit again, wherein, double conversion carries out in different circuit spaces, to eliminate various Intermodulation Interference.
Programme-controlled gain circuit comprises the fixing amplifier of the first numerical-control attenuator 131, first 132 and the second fixing amplifier 133 that connect successively, according to the testing result of simulated power testing circuit, control the numerical value of adjustment first numerical-control attenuator 131, realize whole passage automatic growth control.
In a preferred embodiment, described power splitter 10 is connected to described first frequency mixer 121 by the second numerical-control attenuator 112, first low pass filter 113 and the second low pass filter 114 successively, for being with interior Insertion Loss and Out-of-band rejection to signal, reduce signal disturbing.
In a preferred embodiment, described first band pass filter 122 is connected to described second band pass filter 123 by the first amplifier 125, and amplifier 125 is arranged between two band pass filters, amplifies inband signaling, inhibition zone external signal.
In a preferred embodiment, the described second fixing amplifier 133 also connects the 3rd band pass filter the 134, three band pass filter 134 for carrying out bandpass filtering to signal.
In a preferred embodiment, described first band pass filter 122 is high if bandpas filter, described second band pass filter is high if bandpas filter, and described 3rd band pass filter 134 is Low Medium Frequency band pass filter, can improve the performance of double conversion further.
The utility model is used for the radio-frequency (RF) front-end circuit of satellite-signal monitoring, and simulated power testing circuit can detect the power of digital signal, the thresholding corresponding different to different signal powers, and comparative result is as the adjustment foundation of programme-controlled gain circuit; By variable local oscillator mixting circuit and fixing local oscillator mixting circuit, satellite RF signal is transformed to the low intermediate frequency signal of fixed frequency in double conversion circuit, the numerical-control attenuator in programme-controlled gain circuit can adjust gain values, realizes controlling the gain of signal.The utility model can be applied to the research and development of satellite signal spectrum monitoring system, also can be applicable to the research and development of satellite communication system, meanwhile, is applicable to electronic countermeasures, radio monitoring field, has wide market application foreground.The volume of this circuit is little, cost is low, cost performance is high, is the requisite companion module of development satellite channel monitoring product.
The above embodiment only have expressed several execution mode of the present utility model, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the utility model the scope of the claims.It should be pointed out that for the person of ordinary skill of the art, without departing from the concept of the premise utility, can also make some distortion and improvement, these all belong to protection range of the present utility model.Therefore, the protection range of the utility model patent should be as the criterion with claims.
Claims (7)
1. for a radio-frequency (RF) front-end circuit for broadband satellite signal monitoring, it is characterized in that, comprise simulated power testing circuit, double conversion circuit, programme-controlled gain circuit and circuit space separation chamber;
Described simulated power testing circuit comprises the digital thresholding comparison circuit and logarithmic detector that connect successively;
Described double conversion circuit comprises the variable local oscillation circuit, the first frequency mixer, the first band pass filter, the second band pass filter, the second frequency mixer, fixing local oscillation circuit and the 3rd band pass filter that connect successively;
Described programme-controlled gain circuit comprises the first numerical-control attenuator, the first fixing amplifier and the second fixing amplifier that connect successively;
Described logarithmic detector is connected with described first frequency mixer by power splitter, and described second frequency mixer is connected with described first numerical-control attenuator, and the described second fixing amplifier is connected with described 3rd band pass filter;
Described circuit space separation chamber comprises the first cavity, isolates the variable local oscillation circuit in described double conversion circuit and the first frequency mixer; Comprise the second cavity, isolate the first band pass filter in described double conversion circuit and the second band pass filter; Comprise the 3rd cavity, isolate the second frequency mixer in described double conversion circuit, fixing local oscillation circuit and the 3rd band pass filter, and the first numerical-control attenuator, the first fixing amplifier and the second fixing amplifier in described programme-controlled gain circuit.
2. the radio-frequency (RF) front-end circuit of broadband satellite signal monitoring according to claim 1, is characterized in that, described power splitter is connected to described first frequency mixer by the second numerical-control attenuator, the first low pass filter and the second low pass filter successively.
3. the radio-frequency (RF) front-end circuit of broadband satellite signal monitoring according to claim 1, is characterized in that, described first band pass filter is connected to described second band pass filter by the first amplifier.
4. the radio-frequency (RF) front-end circuit of the broadband satellite signal monitoring according to claim 1 or 3, is characterized in that, described first band pass filter is high if bandpas filter.
5. the radio-frequency (RF) front-end circuit of the broadband satellite signal monitoring according to claim 1 or 3, is characterized in that, described second band pass filter is high if bandpas filter.
6. the radio-frequency (RF) front-end circuit of broadband satellite signal monitoring according to claim 1, is characterized in that, described 3rd band pass filter is Low Medium Frequency band pass filter.
7. the radio-frequency (RF) front-end circuit of broadband satellite signal monitoring according to claim 1, is characterized in that, input signal is transformed to the high intermediate-freuqncy signal of fixed frequency by described variable local oscillation circuit and the first frequency mixer; Described high intermediate-freuqncy signal is transformed to low intermediate frequency signal by described fixing local oscillation circuit and the second frequency mixer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420806836.6U CN204392229U (en) | 2014-12-17 | 2014-12-17 | For the radio-frequency (RF) front-end circuit of broadband satellite signal monitoring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420806836.6U CN204392229U (en) | 2014-12-17 | 2014-12-17 | For the radio-frequency (RF) front-end circuit of broadband satellite signal monitoring |
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| Publication Number | Publication Date |
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| CN204392229U true CN204392229U (en) | 2015-06-10 |
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| CN201420806836.6U Active CN204392229U (en) | 2014-12-17 | 2014-12-17 | For the radio-frequency (RF) front-end circuit of broadband satellite signal monitoring |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104506203A (en) * | 2014-12-17 | 2015-04-08 | 广州广电计量检测股份有限公司 | Radio frequency front end circuit for monitoring broadband satellite signal |
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2014
- 2014-12-17 CN CN201420806836.6U patent/CN204392229U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104506203A (en) * | 2014-12-17 | 2015-04-08 | 广州广电计量检测股份有限公司 | Radio frequency front end circuit for monitoring broadband satellite signal |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 510656 Guangdong city of Guangzhou province Whampoa Avenue Tianhe District Xiping Yun Road No. 163 Patentee after: Radio and TV Measurement and Testing Group Co.,Ltd. Patentee after: GUANGDONG SHANFENG MEASUREMENT & CONTROL TECHNOLOGY CO.,LTD. Address before: 510656 Guangdong city of Guangzhou province Whampoa Avenue Tianhe District Xiping Yun Road No. 163 Patentee before: GUANGZHOU GRG METROLOGY & TEST Co.,Ltd. Patentee before: GUANGDONG SHANFENG MEASUREMENT & CONTROL TECHNOLOGY CO.,LTD. |
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| CP01 | Change in the name or title of a patent holder |