CN213403013U - Rear selector - Google Patents
Rear selector Download PDFInfo
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- CN213403013U CN213403013U CN202022498805.7U CN202022498805U CN213403013U CN 213403013 U CN213403013 U CN 213403013U CN 202022498805 U CN202022498805 U CN 202022498805U CN 213403013 U CN213403013 U CN 213403013U
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- frequency hopping
- hopping filter
- frequency
- filter
- vacuum relay
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Abstract
The utility model discloses a after-selection ware, including digital control unit, first impedance matcher, second impedance matcher, vacuum relay, first frequency hopping filter, second frequency hopping filter, first low noise amplifier, second low noise amplifier, coupler, equalizer, digital control unit's control signal output part respectively with first frequency hopping filter, second frequency hopping filter, vacuum relay's control signal input end parallel connection. The utility model discloses a digital control unit control vacuum relay realizes the transmission of after-selection ware to different frequency point carrier signal to can switch rapidly the carrier frequency of useful signal, adopt earlier filtering and amplify the mode of filtering again after enlargeing, the bottom small in noise of after-selection ware, the selectivity is high, and output amplitude is high, and the impedance match of wave filter port can be improved to the coupler, and the balanced device can improve the gain flatness of whole wave band, satisfies high-quality matching transmission and spectrum filtration.
Description
Technical Field
The utility model relates to a digit harmonious frequency hopping technical field specifically is a post-selector.
Background
The front-end technology of wideband receivers is becoming increasingly widely used, but because it cannot handle strong off-channel signals, it is still necessary to employ passive tuned circuit filters to prevent cross-modulation, intermodulation, impairments and other interference effects. With the continuous progress of the frequency hopping communication technology, the post-selector is approved by more and more designers with the superior performance index, and is widely applied to military and civil communication systems, and the post-selector presents matching transmission to the frequency in the pass band and performs reflection attenuation to the frequency mismatch in the stop band, thereby realizing the function of filtering the signal spectrum.
The traditional post selector mostly adopts a mode of first two-stage filtering and then amplifying, the selectivity is poor, a single chip microcomputer is mostly adopted as a control circuit, the control mode of the single chip microcomputer is complex, the data conversion output speed is slow, and the frequency hopping speed of the short wave post selector is influenced.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a post selector to solve the problem that proposes among the above-mentioned background art.
In order to achieve the above object, the utility model provides a following technical scheme: a post-selector comprises a digital control unit, a first impedance matcher, a second impedance matcher, a vacuum relay, a first frequency hopping filter, a second frequency hopping filter, a first low noise amplifier, a second low noise amplifier, a coupler and an equalizer, wherein a control signal output end of the digital control unit is respectively connected with control signal input ends of the first frequency hopping filter, the second frequency hopping filter and the vacuum relay in parallel, a signal input end of the first impedance matcher receives radio frequency signal input, a signal output end of the first impedance matcher is connected with a signal input end of the vacuum relay, a signal output end of the vacuum relay is connected with a signal input end of the first frequency hopping filter, a signal output end of the first frequency hopping filter is connected with a signal input end of the second frequency hopping filter through the first low noise amplifier, the coupler and the equalizer, and the signal of the second frequency hopping filter is output through a second impedance matcher and a second low noise amplifier.
Preferably, the digital control unit is a shift register, receives an external master control signal and converts the external master control signal into a parallel control code, and is used for controlling the working states of the vacuum relay, the first frequency hopping filter and the second frequency hopping filter.
Preferably, the first frequency hopping filter and the second frequency hopping filter have the same structure, and the operating frequency is 2MHz-30 MHz.
Preferably, the vacuum relay is used for selecting radio frequency channels and respectively controlling the radio frequency channels of the frequency bands of the corresponding frequency hopping filter, and the radio frequency ends are 2MHz-4.999MHz wave bands, 5MHz-9.999MHz wave bands, 10MHz-19.999MHz wave bands and 20MHz-30MHz wave bands.
Compared with the prior art, the beneficial effects of the utility model are that: the utility model discloses a digital control unit control vacuum relay realizes the transmission of after-selection ware to different frequency point carrier signal to can switch rapidly the carrier frequency of useful signal, adopt earlier filtering and amplify the mode of filtering again after enlargeing, the bottom small in noise of after-selection ware, the selectivity is high, and output amplitude is high, and the impedance match of wave filter port can be improved to the coupler, and the balanced device can improve the gain flatness of whole wave band, satisfies high-quality matching transmission and spectrum filtration.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention;
in the figure: 1. a digital control unit; 2. a first impedance matcher; 3. a vacuum relay; 4. a first frequency hopping filter; 5. a first low noise amplifier; 6. a coupler; 7. an equalizer; 8. a second frequency hopping filter; 9. a second impedance matcher; 10. a second low noise amplifier.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1-1, the present invention provides a technical solution: a post-selector comprises a digital control unit 1, a first impedance matcher 2, a second impedance matcher 9, a vacuum relay 3, a first frequency hopping filter 4, a second frequency hopping filter 8, a first low noise amplifier 5, a second low noise amplifier 10, a coupler 6 and an equalizer 7, wherein the control signal output end of the digital control unit 1 is respectively connected with the control signal input ends of the first frequency hopping filter 4, the second frequency hopping filter 8 and the vacuum relay 3 in parallel, the digital control unit 1 converts an received external main control signal into a 10-bit parallel code, the 1 st-8 th bit control code is used for setting the first frequency hopping filter 4 and the second frequency hopping filter 8 to generate resonant frequency, the 9 th bit is used for selecting the working waveband of the vacuum relay 3, the 10 th bit is a reserved bit, and two-stage frequency hopping filters are used in a cascade mode, so that the frequency selection characteristic of the post-selector can be improved, the signal input end of the first impedance matcher 2 receives radio frequency signal input, the signal output end of the first impedance matcher 2 is connected with the signal input end of the vacuum relay 3, the signal output end of the vacuum relay 3 is connected with the signal input end of the first frequency hopping filter 4, the signal output end of the first frequency hopping filter 4 passes through a first low noise amplifier 5 and a coupler 6, the equalizer 7 is connected with the signal input end of the second frequency hopping filter 8, the coupler 6 can improve the impedance matching of the filter port, the equalizer 7 can improve the gain flatness of the whole wave band, the output amplitude of the short wave post selector is basically consistent within 2MHz-30MHz, the signal of the second frequency hopping filter 8 is output through the second impedance matcher 9 and the second low noise amplifier 10, the low noise amplifier 10 can compensate the insertion loss introduced by the frequency hopping filter, and the output amplitude of the post selector is improved.
The utility model discloses in: the digital control unit 1 is a shift register, receives an external master control signal and converts the external master control signal into a parallel control code, and is used for controlling the working states of the vacuum relay 3, the first frequency hopping filter 4 and the second frequency hopping filter 8.
The utility model discloses in: the first frequency hopping filter 4 and the second frequency hopping filter 8 have the same structure, and the working frequency is 2MHz-30 MHz.
The utility model discloses in: the vacuum relay 3 is used for selecting radio frequency channels and respectively controlling the radio frequency channels of each frequency band of the corresponding frequency hopping filter, and the radio frequency ends are 2MHz-4.999MHz wave bands, 5MHz-9.999MHz wave bands, 10MHz-19.999MHz wave bands and 20MHz-30MHz wave bands.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (4)
1. The utility model provides a post-selector, includes digital control unit (1), first impedance matcher (2), second impedance matcher (9), vacuum relay (3), first frequency hopping filter (4), second frequency hopping filter (8), first low noise amplifier (5), second low noise amplifier (10), coupler (6), equalizer (7), its characterized in that: the control signal output end of the digital control unit (1) is respectively connected with the control signal input ends of a first frequency hopping filter (4), a second frequency hopping filter (8) and a vacuum relay (3) in parallel, the signal input end of a first impedance matcher (2) receives radio frequency signal input, the signal output end of the first impedance matcher (2) is connected with the signal input end of the vacuum relay (3), the signal output end of the vacuum relay (3) is connected with the signal input end of the first frequency hopping filter (4), the signal output end of the first frequency hopping filter (4) is connected with the signal input end of the second frequency hopping filter (8) through a first low noise amplifier (5), a coupler (6) and an equalizer (7), and the signal of the second frequency hopping filter (8) is connected with the signal input end of the second frequency hopping filter (9), The second low noise amplifier (10) outputs.
2. A post-selector as claimed in claim 1, wherein: the digital control unit (1) is a shift register, receives an external master control signal, converts the external master control signal into a parallel control code, and is used for controlling the working states of the vacuum relay (3), the first frequency hopping filter (4) and the second frequency hopping filter (8).
3. A post-selector as claimed in claim 1, wherein: the first frequency hopping filter (4) and the second frequency hopping filter (8) have the same structure, and the working frequency is 2MHz-30 MHz.
4. A post-selector as claimed in claim 1, wherein: the vacuum relay (3) is used for selecting radio frequency channels and respectively controlling the radio frequency channels of the frequency bands of the corresponding frequency hopping filter, and the radio frequency ends are 2MHz-4.999MHz wave bands, 5MHz-9.999MHz wave bands, 10MHz-19.999MHz wave bands and 20MHz-30MHz wave bands.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022498805.7U CN213403013U (en) | 2020-11-03 | 2020-11-03 | Rear selector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022498805.7U CN213403013U (en) | 2020-11-03 | 2020-11-03 | Rear selector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213403013U true CN213403013U (en) | 2021-06-08 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022498805.7U Active CN213403013U (en) | 2020-11-03 | 2020-11-03 | Rear selector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213403013U (en) |
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2020
- 2020-11-03 CN CN202022498805.7U patent/CN213403013U/en active Active
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