Satellite signal transponder
By designing a satellite signal transponder containing multiple modules, the problem of insufficient single-satellite signal forwarding and anti-interference capabilities in the existing technology is solved, and high-quality forwarding and anti-interference capabilities of dual satellite signals are achieved.
Patent Information
- Application Number
- CN202421188594.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-28
- Publication Date
- 2025-01-24
- Estimated Expiration
- 2034-05-28
AI Technical Summary
Existing satellite signal repeaters can only realize single satellite signal forwarding, and the anti-interference measures are poor, resulting in poor signal forwarding quality and stability.
A satellite signal transponder including an antenna selection module, a frequency conversion module, a low-noise amplifier module, a segmented filter module and a gain control module is designed. Through the combination of these modules, dual-satellite signal forwarding and extremely narrow-band filtering of signals are achieved, enhancing anti-interference capabilities.
The high -quality forwarding of the dual satellite signal has enhanced the anti -interference ability of the forwarder and ensured the stability and quality of the signal.
Smart Images
Figure CN222395673U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of signal forwarding, in particular to a satellite signal forwarder. Background Art
[0002] Satellite transponders can process analog signals or digital signals, and are mainly used to forward digital TV signals. The received satellite signal is transferred to the RF module through the outdoor receiving antenna, and the RF module forwards the signal through the RF filtering and gain amplifier part, so as to forward the outdoor satellite signal to the indoor room, ensuring the strength and stability of the signal.
[0003] Most of the current satellite signal repeaters can only forward single satellite signals, and do not have good anti-interference measures for signal reception and forwarding, and thus cannot guarantee the quality and stability of signal forwarding. Utility Model Content
[0004] In order to solve the above problem, that is, the current satellite signal repeater can only perform single satellite signal repeating and has poor anti-interference measures, the utility model proposes a satellite signal repeater, which includes:
[0005] An antenna selection module, the input end of which is electrically connected to at least two receiving antennas arranged in parallel, for selecting an antenna under the control of a discrete signal of the display control component;
[0006] A frequency conversion module, comprising an up-converter and a down-converter, wherein the up-converter is used to increase the signal frequency, and the down-converter is used to reduce the signal frequency; an input end of the down-converter is electrically connected to an output end of the antenna selection module;
[0007] A low noise amplifier module is used to improve the driving capability of the signal with low distortion; two low noise amplifier modules are provided, and the two low noise amplifier modules are respectively provided upstream of the down converter and downstream of the up converter;
[0008] A segmented filtering module, which is used to enhance the anti-interference capability of the repeater, wherein the input end of the segmented filtering module is electrically connected to the output end of the down converter, and the output end of the segmented filtering module is electrically connected to the input end of the up converter;
[0009] A gain control module, whose input end is electrically connected to the output end of the up-converter, and whose output end is electrically connected to no less than two transmitting antennas arranged in parallel, so as to independently adjust the gain of each output transmitting antenna.
[0010] The utility model is further configured as follows: it also includes a local oscillator module, the output end of the local oscillator module is electrically connected to the down converter and the up converter respectively, so as to provide LO local oscillator signals therefor respectively.
[0011] The utility model is further configured as follows: the local oscillator module includes a temperature compensation crystal oscillator, a filter network and a decomposition circuit, and two output ends of the decomposition circuit are electrically connected to the down converter and the up converter respectively.
[0012] The utility model is further configured as follows: the segmented filtering module includes multiple surface acoustic wave filters, a distribution network system and a synthesis network system, the multiple surface acoustic wave filters are arranged in parallel, the input end of the distribution network system is electrically connected to the output end of the down converter, and the output end of the distribution network system is electrically connected to the input end of the surface acoustic wave filter; the output end of the synthesis network system is electrically connected to the input end of the up converter, and the input end of the synthesis network system is electrically connected to the output end of the surface acoustic wave filter.
[0013] The utility model is further configured as follows: the surface acoustic wave filter is a SAW filter with extremely narrow-band filtering processing.
[0014] The utility model is further configured as follows: the gain control module includes a programmable gain amplifier and the distribution network system.
[0015] The utility model is further configured as follows: the distribution network system is a multi-port microstrip line distributor; the synthesis network system is a multi-port microstrip line synthesizer.
[0016] The utility model is further configured as follows: the antenna selection module is a high-isolation absorptive radio frequency switch, the radio frequency switch is a single-pole double-throw type, and its port isolation is ≥40dB.
[0017] The utility model is further configured as follows: the low noise amplifier module includes a unipolar fixed gain amplifier, whose typical amplification gain in the L band is 23.7 dB, and the LC network at the input end of the unipolar fixed gain amplifier is used to expand the working frequency band of its lower section.
[0018] The utility model is further configured as follows: the output end of the up-converter is electrically connected to a low-pass filter network so as to select useful frequency points in the mixed signal.
[0019] The beneficial effects of the utility model are:
[0020] 1. By setting up the antenna selection module, the receiving port can be switched according to the reception quality of the satellite signal to realize dual satellite signal forwarding, thereby effectively ensuring the quality of signal conversion.
[0021] 2. By setting up the surface acoustic wave filter, it is possible to achieve extremely narrow-band filtering of the signal, thereby producing a flat in-band insertion loss and a steep roll-off curve, enhancing the anti-interference ability of the repeater and avoiding noise generation in the signal quality. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Figure 1 The utility model is shown in the structural diagram.
[0023] Figure 2 A circuit diagram of the antenna selection module is shown.
[0024] Figure 3 The circuit diagram of the frequency conversion module is shown.
[0025] Figure 4 The circuit diagram of the low noise amplifier module is shown.
[0026] Figure 5 shows the schematic diagram of a SAW filter.
[0027] Figure 6 The circuit diagram of the local oscillator module is shown. DETAILED DESCRIPTION
[0028] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.
[0029] The utility model proposes a satellite signal repeater, comprising an antenna selection module, an input end of which is electrically connected to two receiving antennas, the two receiving antennas are arranged in parallel, and are used to select a signal with better quality under the discrete signal control of a display control component; a frequency conversion module, which comprises an up-converter and a down-converter, the up-converter is used to increase the signal frequency, the down-converter is used to reduce the signal frequency, the input end of the down-converter is electrically connected to the output end of the antenna selection module, a low noise amplifier module, two low noise amplifier modules are arranged, the two low noise amplifier modules are respectively arranged at the upstream of the down-converter and the downstream of the up-converter, and are used to improve the driving ability of the signal with low distortion; a segmented filtering module, which is used to enhance the anti-interference of the repeater The invention relates to a method for controlling the frequency of a transmission line of an optical fiber and a plurality of transmission lines, wherein the input end of the segmented filtering module is electrically connected to the output end of the down converter so that the signal in the down converter is transmitted into the segmented filtering module, and the output end of the segmented filtering module is electrically connected to the input end of the up converter so that the signal passing through the segmented filtering module is transmitted into the up converter, and the up converter increases the signal frequency; the input end of the gain control module is electrically connected to the output end of the up converter, and the output end of the gain control module is electrically connected to 12 transmitting antennas, and the 12 transmitting antennas are arranged in parallel. The gain of each output transmitting antenna is independently adjusted by the gain control module, and the signal with increased frequency passing through the up converter is transmitted into the gain control module, and is then transmitted out by the transmitting antenna after being amplified.
[0030] The invention also includes a local oscillator module, the output end of which is electrically connected to the down converter and the up converter respectively, so as to provide LO local oscillator signals to them respectively. The local oscillator module includes a temperature compensation crystal oscillator, a filter network and a centrifugal circuit, and the two output ends of the centrifugal circuit are electrically connected to the up converter and the down converter respectively, so as to output LO local oscillator signals to the down converter and the up converter.
[0031] Since the signal frequency selected by the repeater component is close and occupies a small bandwidth, there is no need to use a fixed intermediate frequency signal. Therefore, a simple and reliable fixed-frequency local oscillator is used, and the intermediate frequency signal is controlled within the range of 10-200MHz.
[0032] The local oscillator module uses a temperature compensated crystal oscillator with extremely high frequency stability as the clock source, and its frequency accuracy can reach 1×10 -12 , effectively preventing the signal frequency from being distorted due to the influence of local oscillator errors.
[0033] The antenna selection module is a high-isolation absorptive RF switch, and the RF switch is a single-pole double-throw type, and the port isolation of the RF switch is ≥40dB. By setting the antenna selection module, the display control component can select the signals of the two antennas according to the signal quality according to the predetermined control strategy, so that the signal with a high signal-to-noise ratio is forwarded.
[0034] The low noise amplifier module includes a single-pole fixed gain amplifier, whose typical amplification gain in the L band is 23.7dB, and the P1dB parameter is ≥-40dBm, where P1 is any characteristic point in the single-pole fixed gain amplifier, and the LC network at the input end of the single-pole fixed gain amplifier is used to expand the working frequency band of the lower section of the amplifier. That is, two low noise amplifier modules are installed upstream of the down converter and downstream of the up converter respectively, so that their power frequency can meet the technical requirements of the converter.
[0035] The frequency conversion module is a structure that performs spectrum shifting on the signal carrier frequency and retains the signal bandwidth and modulation information. By setting the frequency conversion module, the carrier frequency of the signal can be reduced to less than 100MHz. The specific structure of the up-converter and down-converter in this application can refer to the LT5522EUF active mixer. The difference is that the output end of the up-converter is electrically connected to the low-pass filter network to select useful frequency points in the mixed signal.
[0036] The segmented filtering module includes 10 surface acoustic wave filter processors, a distribution network system and a synthesis network system. The 10 surface acoustic wave filter processors are arranged in parallel. The input end of the distribution network system is electrically connected to the output end of the down converter, the output end of the distribution network system is electrically connected to the input end of the surface acoustic wave filter, the output end of the surface acoustic wave filter is electrically connected to the input end of the synthesis network system, and the output end of the synthesis network system is electrically connected to the input end of the up converter.
[0037] Through the processing of 10 surface acoustic wave filters, the out-of-band signals are suppressed, thereby effectively filtering out the aviation signals in the adjacent frequency bands.
[0038] The distribution network system is used to distribute a single signal input terminal into multiple signal output terminals, that is, to distribute the signal output by the down converter into 10 signal output terminals, which are respectively input into 10 surface acoustic wave filters for processing. The synthesis network system is used in the reverse direction of the distribution network system, that is, to synthesize multiple signal input terminals into a single signal output terminal, that is, to combine the signals output from the 10 surface acoustic wave filters into a single signal output terminal, which is input into the up converter.
[0039] Further filtering of the signal in segments can effectively eliminate aviation signals in adjacent frequency bands, making the signal quality higher.
[0040] It should be noted that the surface acoustic wave filter uses a SAW filter with extremely narrow-band filtering processing. Because the carrier frequency of the signal is reduced to less than 100 MHz through the frequency conversion module, the SAW filter can achieve extremely narrow-band filtering processing.
[0041] The SAW filter is a transducer device in which electrical signals are transmitted in the form of sound waves, so it has a good filtering effect. Its steep roll-off curve can make the 30dB / 60dB bandwidth ratio very small and quickly attenuate the out-of-band signal to below 60dB.
[0042] The gain control module includes a programmable gain amplifier, and each transmitting antenna is provided with a programmable gain amplifier. The output end of the programmable gain amplifier is electrically connected to the input end of the transmitting antenna. It also includes a distribution network system, wherein the model of the programmable gain amplifier is ADL5230, which adopts a configuration of attenuation first and fixed amplification later. The program uses the SPI interface to adjust its front-end attenuation to achieve the control of the entire link amplification gain, which has a dynamic gain range of -23-40dB. At the same time, the interface of the programmable gain amplifier adopts a daisy chain form, and the control structure is connected in series step by step, which effectively reduces the control interface expenses of the system and reduces the complexity of the system. This amplifier is a directly purchased existing technology, so it is not repeated.
[0043] The input end of the distribution network system in the gain control module is electrically connected to the output end of the up-converter, and the output end of the distribution network system is electrically connected to 12 programmable gain amplifiers respectively to distribute the single-channel signal to the input ends of the 12 programmable gain amplifiers.
[0044] It should be noted that the distribution network system in the present application is a multi-port microstrip line distributor, and the synthesis network system is a multi-port microstrip line synthesizer.
[0045] In summary, the utility model can switch the receiving port according to the reception quality of the satellite signal by setting the antenna selection module, realize the dual satellite signal forwarding, and effectively ensure the quality of signal conversion. By setting the surface acoustic wave filter, it can realize the extremely narrow band filtering processing of the signal, thereby producing a flat in-band insertion loss and a steep roll-off curve, enhancing the anti-interference ability of the repeater and avoiding noise generation in the signal quality.
[0046] Although the present invention has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present invention. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.
[0047] In the description of the present invention, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.
[0048] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.
[0049] The term "comprise" or any other similar term is intended to cover a non-exclusive inclusion, such that a process, article, or apparatus / device that includes a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, article, or apparatus / device.
[0050] So far, the technical solution of the utility model has been described in conjunction with the preferred embodiments shown in the accompanying drawings, but it is easy for those skilled in the art to understand that the protection scope of the utility model is obviously not limited to these specific embodiments. Without departing from the principle of the utility model, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the utility model.
Claims
1. A satellite signal repeater, characterized in that: Included are: An antenna selection module, the input end of which is electrically connected to at least two receiving antennas arranged in parallel, for selecting an antenna under the control of a discrete signal of the display control component; A frequency conversion module, comprising an up-converter and a down-converter, wherein the up-converter is used to increase the signal frequency, and the down-converter is used to reduce the signal frequency; an input end of the down-converter is electrically connected to an output end of the antenna selection module; A low noise amplifier module is used to improve the driving capability of the signal with low distortion; two low noise amplifier modules are provided, and the two low noise amplifier modules are respectively provided upstream of the down converter and downstream of the up converter; A segmented filtering module, which is used to enhance the anti-interference capability of the repeater, wherein the input end of the segmented filtering module is electrically connected to the output end of the down converter, and the output end of the segmented filtering module is electrically connected to the input end of the up converter; A gain control module, whose input end is electrically connected to the output end of the up-converter, and whose output end is electrically connected to no less than two transmitting antennas arranged in parallel, so as to independently adjust the gain of each output transmitting antenna.
2. The satellite signal repeater according to claim 1, characterized in that: A local oscillator module is also included, and the output end of the local oscillator module is electrically connected to the down converter and the up converter respectively, so as to provide LO local oscillator signals therefor respectively.
3. The satellite signal repeater according to claim 2, characterized in that: The local oscillator module includes a temperature compensation crystal oscillator, a filter network and a decomposition circuit. Two output ends of the decomposition circuit are electrically connected to the down converter and the up converter respectively.
4. The satellite signal repeater according to claim 1, characterized in that: The segmented filtering module includes multiple surface acoustic wave filters, a distribution network system and a synthesis network system. The multiple surface acoustic wave filters are arranged in parallel. The input end of the distribution network system is electrically connected to the output end of the down converter, and the output end of the distribution network system is electrically connected to the input end of the surface acoustic wave filter; the output end of the synthesis network system is electrically connected to the input end of the up converter, and the input end of the synthesis network system is electrically connected to the output end of the surface acoustic wave filter.
5. The satellite signal repeater according to claim 4, characterized in that: The surface acoustic wave filter is a SAW filter with extremely narrow band filtering processing.
6. The satellite signal repeater according to claim 4, characterized in that: The gain control module includes a programmable gain amplifier and the distribution network system.
7. The satellite signal repeater according to claim 6, characterized in that: The distribution network system is a multi-port microstrip line distributor; the synthesis network system is a multi-port microstrip line synthesizer.
8. The satellite signal repeater according to claim 1, characterized in that: The antenna selection module is a high-isolation absorptive radio frequency switch, the radio frequency switch is a single-pole double-throw type, and its port isolation is ≥40dB.
9. The satellite signal repeater according to claim 1, characterized in that: The low noise amplifier module includes a single-pole fixed gain amplifier, whose typical amplification gain in the L band is 23.7 dB. The LC network at the input end of the single-pole fixed gain amplifier is used to expand the working frequency band of its lower section.
10. The satellite signal repeater according to claim 1, characterized in that: The output end of the up-converter is electrically connected to a low-pass filter network to select useful frequency points in the mixed signal.