CN111294533A - Low-noise down converter, signal processing method and storage medium - Google Patents

Low-noise down converter, signal processing method and storage medium Download PDF

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CN111294533A
CN111294533A CN202010138553.9A CN202010138553A CN111294533A CN 111294533 A CN111294533 A CN 111294533A CN 202010138553 A CN202010138553 A CN 202010138553A CN 111294533 A CN111294533 A CN 111294533A
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frequency band
satellite
signal
feed source
mixing
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莫英强
陈锦鹏
孙功宪
高峰
许祥滨
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Shenzhen Beidou Wanfang Information Technology Co ltd
Techtotop Microelectronics Co Ltd
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Shenzhen Beidou Wanfang Information Technology Co ltd
Techtotop Microelectronics Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/50—Tuning indicators; Automatic tuning control
    • 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
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/20—Adaptations for transmission via a GHz frequency band, e.g. via satellite

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  • Signal Processing (AREA)
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  • Computer Networks & Wireless Communication (AREA)
  • Power Engineering (AREA)
  • Superheterodyne Receivers (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)

Abstract

The embodiment of the application is suitable for the technical field of signal processing, and provides a low-noise down converter, a signal processing method and a storage medium, wherein the low-noise down converter comprises: the first feed source is used for receiving a first satellite signal transmitted by a first satellite; the first local oscillator unit is electrically connected with the first feed source and is used for mixing the first satellite signal to obtain a first intermediate frequency signal belonging to a preset first frequency band; the second feed source is independent from the first feed source and used for receiving a second satellite signal transmitted by a second satellite; and the second local oscillator unit is electrically connected with the second feed source and used for mixing the second satellite signal to obtain a second intermediate frequency signal belonging to a preset second frequency band, and the first frequency band and the second frequency band are not overlapped with each other. The low-noise down converter can realize simultaneous working of a plurality of feed sources and is not interfered with each other.

Description

Low-noise down converter, signal processing method and storage medium
The present application claims priority to the chinese invention patent application entitled "a low noise downconverter, signal processing method, and storage medium" having an application date of 2019, 12 and 27, and an application number of 201911374995.7.
Technical Field
The present application belongs to the field of signal processing technology, and in particular, relates to a low noise down converter, a signal processing method and a storage medium.
Background
A Low Noise Block (LNB), i.e. a high frequency head, is used to amplify and downconvert the satellite signal transmitted by the feed source, and convert the high frequency signal to an intermediate frequency, so as to facilitate the transmission of the coaxial cable and the demodulation and operation of the satellite receiver.
Generally, a tuner having two feeds only one of which is operable when receiving satellite signals. If the two feed sources work simultaneously, intermediate frequency signals obtained by mixing the two feed sources will be overlapped, interference is formed between the two intermediate frequency signals, and satellite signals cannot be received normally.
Disclosure of Invention
In view of this, embodiments of the present application provide a low noise block down converter, a signal processing method, and a storage medium, which can solve the problem that multiple feed sources of a tuner cannot work simultaneously in the prior art.
A first aspect of an embodiment of the present application provides a low noise down converter, including:
the first feed source is used for receiving a first satellite signal transmitted by a first satellite;
the first local oscillator unit is electrically connected with the first feed source and is used for mixing the first satellite signal to obtain a first intermediate frequency signal belonging to a preset first frequency band;
the second feed source is independent from the first feed source and used for receiving a second satellite signal transmitted by a second satellite;
and the second local oscillator unit is electrically connected with the second feed source and used for mixing the second satellite signal to obtain a second intermediate frequency signal belonging to a preset second frequency band, and the first frequency band and the second frequency band are not overlapped with each other.
A second aspect of the embodiments of the present application provides a signal processing method, applied to a low noise down converter, where the signal processing method includes:
controlling a plurality of feed sources of the low noise down converter to respectively receive satellite signals transmitted by a plurality of satellites, wherein the plurality of satellites at least comprise a first satellite and a second satellite, and the plurality of feed sources at least comprise a first feed source and a second feed source;
determining a first frequency band corresponding to the first feed source and a second frequency band corresponding to the second feed source, wherein the first frequency band and the second frequency band are not overlapped with each other;
when the first feed source receives a first satellite signal transmitted by the first satellite, mixing the first satellite signal, and outputting a first intermediate frequency signal belonging to the first frequency band;
and when the second feed source receives a second satellite signal transmitted by the second satellite, mixing the second satellite signal and outputting a second intermediate frequency signal belonging to the second frequency band.
A third aspect of the embodiments of the present application provides a signal processing apparatus, which is applied to a low noise down converter, and the signal processing apparatus includes:
the signal receiving control module is used for controlling a plurality of feed sources of the low noise down converter to respectively receive satellite signals transmitted by a plurality of satellites, the plurality of satellites at least comprise a first satellite and a second satellite, and the plurality of feed sources at least comprise a first feed source and a second feed source;
a frequency band determining module, configured to determine a first frequency band corresponding to the first feed source and a second frequency band corresponding to the second feed source, where the first frequency band and the second frequency band are not overlapped with each other;
the first frequency mixing module is used for mixing the first satellite signal when the first feed source receives the first satellite signal transmitted by the first satellite and outputting a first intermediate frequency signal belonging to the first frequency band;
and the second frequency mixing module is used for mixing the second satellite signal when the second feed source receives the second satellite signal transmitted by the second satellite, and outputting a second intermediate frequency signal belonging to the second frequency band.
A fourth aspect of embodiments of the present application provides a low noise downconverter, including a memory, a processor, and a computer program stored in the memory and executable on the processor, where the low noise downconverter is the low noise downconverter of the first aspect, and the processor implements the signal processing method of the second aspect when executing the computer program.
A fifth aspect of embodiments of the present application provides a computer-readable storage medium, which stores a computer program, where the computer program is executed by a processor of the low noise downconverter of the first aspect to implement the signal processing method of the second aspect.
A sixth aspect of embodiments of the present application provides a computer program product, which, when running on the low-noise downconverter of the first aspect, causes the low-noise downconverter to perform the signal processing method of the second aspect.
Compared with the prior art, the embodiment of the application has the following advantages:
according to the embodiment of the application, for a tuner with a plurality of feed sources, satellite signals received by the feed sources are subjected to frequency mixing processing by using different local oscillator units, intermediate frequency signals meeting the requirement of a preset set top box receiving frequency band can be output, the feed sources can work simultaneously, and mutual interference is avoided.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings used in the embodiments or the description of the prior art will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the application, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
FIG. 1 is a schematic diagram of a circuit configuration of a low noise downconverter in accordance with an embodiment of the present application;
FIG. 2 is a schematic diagram illustrating an application scenario of a low noise downconverter in accordance with an embodiment of the present application;
FIG. 3 is a schematic illustration of frequency division according to an embodiment of the present application;
FIG. 4 is a flowchart illustrating steps of a signal processing method according to an embodiment of the present application;
FIG. 5 is a schematic diagram of a signal processing apparatus according to an embodiment of the present application;
FIG. 6 is a schematic diagram of a low noise downconverter of an embodiment of the present application.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the present application. However, it will be apparent to one skilled in the art that the present application may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.
Generally, in order to fully utilize limited bandwidth resources, a repeater transmits two beams simultaneously, and the two beams propagate perpendicular to each other without interfering with each other. The mutually vertical transmission mode can be divided into two modes of linear polarization (vertical and horizontal transmission) and circular polarization (left-hand and right-hand transmission), the frequency range of the mutually vertical transmission mode is 10.7GHz to 12.75GHz, and the bandwidth of the mutually vertical transmission mode is 2.05 GHz. Therefore, the bandwidth of one direct broadcast satellite is 4.1GHz, and the bandwidth of two direct broadcast satellites is 8.2 GHz. The intermediate frequency band (i.e. the output frequency band of the tuner) received by the set-top box is 950MHz to 2150MHz, the bandwidth is only 1.2GHz, and the 8.5GHz bandwidth received by the tuner is far greater than the 1.2GHz bandwidth receivable by the set-top box.
Therefore, in order to enable the two feed sources of the tuner to simultaneously receive the live broadcast signals transmitted by two live broadcast satellites, the core concept of the embodiment of the application is that the live broadcast signals respectively received by the two feed sources of the tuner are mixed with different local oscillators to obtain different intermediate frequencies, and the output intermediate frequency signals fall within the range of the receivable frequency bands of the set top box.
The technical solution of the present application will be described below by way of specific examples.
Referring to fig. 1, a schematic circuit structure diagram of a low noise block down converter according to an embodiment of the present disclosure is shown, which may specifically include a first feed source, a first local oscillation unit electrically connected to the first feed source, a second feed source configured independently from the first feed source, and a second local oscillation unit electrically connected to the second feed source.
The first feed source can be used for receiving a first satellite signal transmitted by a first satellite; the second feed may be for receiving a second satellite signal transmitted by a second satellite; the first local oscillator unit may be configured to mix frequencies of a first satellite signal to obtain a first intermediate frequency signal belonging to a preset first frequency band; and the second local oscillator unit can be used for mixing the second satellite signal to obtain a second intermediate frequency signal belonging to a preset second frequency band, and the first frequency band and the second frequency band are not overlapped with each other.
In this embodiment, the first satellite and the second satellite may be live satellites for transmitting television programs or broadcast programs.
Fig. 2 is a schematic diagram of an application scenario of the low noise downconverter of the present embodiment. Satellite signals transmitted by the first satellite and the second satellite can be received by the two feed sources of the tuner respectively, after processing, the tuner can transmit intermediate-frequency signals obtained after frequency mixing to the set-top box, and corresponding television programs or broadcast programs can be played through demodulation and the like of the set-top box. The satellite signals transmitted by the first satellite and the second satellite may include both vertical signals and horizontal signals.
In a specific implementation, a first satellite signal received by the first feed source may be subjected to amplification, filtering, and the like, and then may be mixed with an electromagnetic wave generated by the first local oscillation unit to obtain a first intermediate frequency signal belonging to a first frequency band.
The first frequency band may be determined according to actual needs. Generally, the first frequency band should be within a frequency band receivable by the set-top box, i.e., 950MHz to 2150 MHz. On the other hand, in order to ensure that the second satellite signal received by the second feed source can be located in the frequency band range after being processed and the second satellite signal and the frequency band range are not interfered with each other, the range from 950MHz to 2150MHz may be divided, so that the first frequency band and the second frequency band are divided into a certain section located therein.
Fig. 3 is a schematic diagram of frequency division in the present embodiment. According to the division of fig. 3, the first frequency band may be set to the 950MHz to 1950MHz range, and the second frequency band may be set to the 2010MHz to 2150MHz range.
Of course, the above-mentioned frequency range value receivable by the set-top box is only an example of this embodiment, and according to the actual situation of the frequency range receivable by the set-top box, a person skilled in the art may flexibly determine the specific values of the first frequency band and the second frequency band on the basis of the scheme provided by this embodiment, which is not limited in this embodiment.
After the first frequency band range is determined, various parameters of the first local oscillation unit may be set accordingly, so as to perform frequency mixing on the first intermediate frequency signal.
As shown in fig. 1, the high-frequency tuner further includes a first filter, which is electrically connected to the first local oscillator unit and may be configured to filter the first intermediate frequency signal and output the filtered first intermediate frequency signal. That is, the first filter may be a filter matched with the first frequency band, and the filtering by the first filter can ensure that the intermediate frequency signal of the first frequency band is output.
In this embodiment, the second local oscillation unit for mixing the second satellite signal may include a plurality of units. As shown in fig. 1, the second local oscillator units include 4 LO1, LO2, LO3, and LO4, and each of the second local oscillator units is configured to respectively correspond to one mixing frequency band, and is configured to mix the second satellite signals belonging to the corresponding mixing frequency band to obtain a second intermediate frequency signal belonging to a preset second frequency band.
In specific implementation, only one of the 4 second local oscillation units can be powered on to operate, the remaining 3 second local oscillation units are in a power-off and non-operating state, the second satellite signals from 10.7GHz to 11.23GHz can be divided into 4 segments through the 4 different local oscillation units, and the second satellite signals are output through a second filter with the bandwidth from 2010MHz to 2150 MHz.
As shown in table one, this is an example table of a corresponding relationship between the second local oscillator unit and the corresponding mixing frequency band in this embodiment. Each local oscillator unit is configured to correspond to one mixing frequency band, and can output a second intermediate frequency signal belonging to a range from 2010MHz to 2150MHz after mixing processing.
Table one:
second local oscillator unit Frequency mixing band Second intermediate frequency signal
LO1 10.700-10.840GHz 2010-2150MHz
LO2 10.830-10.970GHz 2010-2150MHz
LO3 10.960-11.100GHz 2010-2150MHz
LO4 11.090-11.230GHz 2010-2150MHz
Specifically, which second local oscillator unit is controlled to operate may be determined according to an instruction of the set-top box. Namely, the set-top box sends a control instruction to the high-frequency tuner, and the high-frequency tuner determines which local oscillator unit is selected to be electrified to work according to different instructions. The control instruction may be an instruction based on the digital satellite television receiver control protocol diseqc 1.1.
In this embodiment, a second filter electrically connected to the second local oscillator unit may be used to filter the second intermediate frequency signal and output the filtered second intermediate frequency signal, where the second filter is a filter matched with the second frequency band. That is, a signal belonging to the range of 2010MHz to 2150MHz is output through filtering by the second filter.
In the above example, the circuit structure and the operation principle of the tuner of the present embodiment are described by taking the first feed and the second feed as an example, and it should be understood by those skilled in the art that according to the scheme provided in the present embodiment, the tuner may include more than two feeds, for example, the tuner of the present embodiment may further include a third feed. Similarly, a third feed may be configured independently of the first and second feeds for receiving a third satellite signal transmitted by a third satellite; and the third local oscillator unit electrically connected with the third feed source can be used for mixing a third satellite signal to obtain a third intermediate frequency signal belonging to a preset third frequency band, wherein the third frequency band is located in the receiving frequency band range of the set top box and is not overlapped with the first frequency band and the second frequency band. The number of feed sources of the tuner is not limited in this embodiment.
Of course, only some of the components of the tuner have been described above, and in practical applications, the tuner may further include other processing units. For example, for satellite signals received by the first feed source and the second feed source, the satellite signals may be amplified by using an RF (Radio Frequency) amplifier, and then filtered by using an image rejection filter before being transmitted to a corresponding local oscillator unit for Frequency mixing; in addition, for the second Intermediate Frequency signal that is mixed and output by the second local oscillation unit, before the second Intermediate Frequency signal is input to the second filter for filtering, an IF (Intermediate Frequency suppression) amplifier may be used for processing, and the like. As for the complete circuit structure of the tuner of this embodiment, see fig. 1, which is not described again in this embodiment.
In the embodiment of the application, for a tuner with a plurality of feed sources, satellite signals received by the feed sources are subjected to frequency mixing processing by using different local oscillator units, intermediate frequency signals meeting the requirement of a preset set top box receiving frequency band can be output, and the feed sources can work simultaneously without mutual interference.
Referring to fig. 4, a schematic flow chart illustrating steps of a signal processing method according to an embodiment of the present application is shown, which may specifically include the following steps:
s401, controlling a plurality of feed sources of the low noise down converter to respectively receive satellite signals transmitted by a plurality of satellites, wherein the plurality of satellites at least comprise a first satellite and a second satellite, and the plurality of feed sources at least comprise a first feed source and a second feed source;
it should be noted that the method can be applied to a low noise down converter, i.e. a high frequency head. The signal processing method described in this embodiment can be implemented in the tuner of the foregoing embodiment, and for the specific structure of the tuner, reference may be made to the description of the foregoing embodiment, which is not described again in this embodiment.
In this embodiment, the plurality of feed sources of the tuner may respectively receive satellite signals transmitted from a satellite. For example, a first satellite signal transmitted by a first satellite is received through a first feed, a second satellite signal transmitted by a second satellite is received through a second feed, and so on. The satellite may be a direct broadcast satellite for transmitting television programs or radio programs.
Of course, the tuner in this embodiment may further include a third feed, a fourth feed, and the like, and the satellite signals transmitted by the third satellite and the fourth satellite are received through the third feed and the fourth feed, respectively.
S402, determining a first frequency band corresponding to the first feed source and a second frequency band corresponding to the second feed source, wherein the first frequency band and the second frequency band are not overlapped with each other;
in this embodiment, when different feed sources are controlled to receive satellite signals transmitted by a plurality of satellites respectively, in order to ensure that the received signals do not interfere with each other and can be normally played in a television after being demodulated by a set-top box, a frequency band corresponding to each feed source may be determined first. Namely, firstly, the frequency band of the intermediate frequency signal output by the signal received by each feed source after the mixing processing is determined. Generally, the frequency band should fall within the range of frequency bands that are acceptable to the set-top box, i.e., 950MHz to 2150 MHz.
As an example of the present embodiment, the first frequency band may be set to a range of 950MHz to 1950MHz, and the second frequency band may be set to a range of 2010MHz to 2150 MHz. Of course, the division of the frequency bands is only an example, and a person skilled in the art may select a specific division manner according to actual needs, which is not limited in this embodiment.
S403, when the first feed source receives a first satellite signal transmitted by the first satellite, mixing the first satellite signal, and outputting a first intermediate frequency signal belonging to the first frequency band;
in this embodiment, after receiving the first satellite signal, the first feed source may mix the first satellite signal, so that the first intermediate frequency signal output after mixing meets the requirement of the frequency band range set in the foregoing step. That is, after mixing the first satellite signal, the output first intermediate frequency signal should be located in the range of 950MHz to 1950 MHz.
In a specific implementation, a first local oscillation unit electrically connected to the first feed source may be used to mix the first satellite signal to obtain a first intermediate frequency signal. In order to ensure that the output first intermediate frequency signals all belong to the first frequency range, a first filter electrically connected with the first local oscillation unit may be further adopted to filter the first intermediate frequency signals, output the filtered first intermediate frequency signals, and filter signals of non-first frequency bands.
S404, when the second feed source receives a second satellite signal transmitted by the second satellite, mixing the second satellite signal, and outputting a second intermediate frequency signal belonging to the second frequency band.
Similarly, for the second satellite signal received by the second feed, after mixing it, the output second intermediate frequency signal should be in the range of 2010MHz to 2150 MHz.
In specific implementation, a second local oscillation unit electrically connected to the second feed source may be first used to mix a second satellite signal to obtain a second intermediate frequency signal, and then a second filter electrically connected to the second local oscillation unit is continuously used to filter the second intermediate frequency signal, so as to output the filtered second intermediate frequency signal and filter a signal in a non-second frequency band.
In this embodiment, since the second local oscillation unit includes a plurality of second local oscillation units, when the second local oscillation unit is used to mix the second intermediate frequency signal, a target frequency mixing frequency band corresponding to a second target local oscillation unit may be first determined, where the second target local oscillation unit may be any one of the plurality of second local oscillation units, and then the second target local oscillation unit is used to mix the second satellite signal belonging to the target frequency mixing frequency band, so as to obtain the second intermediate frequency signal.
For example, if the second target local oscillator unit is determined to be LO2, as can be seen from table one, the corresponding target mixing frequency band is 10.830-10.970GHz, at this time, the received second satellite signal belonging to the 10.830-10.970GHz band may be selected to be subjected to mixing processing, and an intermediate frequency signal belonging to the range of 2010MHz to 2150MHz is output.
The second target local oscillator unit may be determined according to a diseqc1.1 instruction sent by the set-top box. Generally, DiSEqC1.1-based instructions may include 8 instructions in total from S1-S8. As shown in table two, this is an example of a corresponding relationship between a control instruction and a second local oscillation unit in this embodiment.
Table two:
Figure BDA0002398193010000091
in the embodiment of the application, frequency bands corresponding to different feed sources of the tuner are determined, and frequency mixing processing can be performed on the received satellite signals after the satellite signals are received, so that intermediate frequency signals obtained after frequency mixing meet the set frequency band requirement, the intermediate frequency signals output by the feed sources are guaranteed to be located in the receivable frequency band range of the set top box and are not overlapped with each other, and the tuner can realize simultaneous working of the feed sources of the tuner and does not interfere with each other.
It should be noted that, the sequence numbers of the steps in the foregoing embodiments do not mean the execution sequence, and the execution sequence of each process should be determined by the function and the inherent logic of the process, and should not constitute any limitation on the implementation process of the embodiments of the present application.
Referring to fig. 5, a schematic diagram of a signal processing apparatus according to an embodiment of the present application is shown, which may specifically include the following modules:
a signal receiving control module 501, configured to control a plurality of feed sources of the low noise down converter to receive satellite signals transmitted by a plurality of satellites respectively, where the plurality of satellites at least include a first satellite and a second satellite, and the plurality of feed sources at least include a first feed source and a second feed source;
a frequency band determining module 502, configured to determine a first frequency band corresponding to the first feed source and a second frequency band corresponding to the second feed source, where the first frequency band and the second frequency band are not overlapped with each other;
a first frequency mixing module 503, configured to mix frequencies of a first satellite signal transmitted by the first satellite when the first feed source receives the first satellite signal, and output a first intermediate frequency signal belonging to the first frequency band;
a second frequency mixing module 504, configured to mix frequencies of the second satellite signal when the second feed source receives a second satellite signal transmitted by the second satellite, and output a second intermediate frequency signal belonging to the second frequency band.
In this embodiment of the present application, the first frequency mixing module 503 may specifically include the following sub-modules:
the first frequency mixing submodule is used for mixing the first satellite signal by adopting a first local oscillator unit electrically connected with the first feed source to obtain a first intermediate frequency signal;
and the first filtering submodule is used for filtering the first intermediate-frequency signal by adopting a first filter electrically connected with the first local oscillation unit and outputting the filtered first intermediate-frequency signal, and the first filter is a filter matched with the first frequency band.
In this embodiment, the second frequency mixing module 504 may specifically include the following sub-modules:
the second frequency mixing submodule is used for mixing the second satellite signal by adopting a second local oscillator unit electrically connected with the second feed source to obtain a second intermediate frequency signal;
and the second filtering submodule is used for filtering the second intermediate-frequency signal by adopting a second filter electrically connected with the second local oscillation unit and outputting the filtered second intermediate-frequency signal, and the second filter is a filter matched with the second frequency band.
In this embodiment of the present application, the second local oscillator unit may include a plurality of local oscillator units, and the second frequency mixing submodule may specifically include the following units:
a target frequency mixing frequency band determining unit, configured to determine a target frequency mixing frequency band corresponding to a second target local oscillation unit, where the second target local oscillation unit is any one of a plurality of second local oscillation units;
and the second satellite signal frequency mixing unit is used for mixing the second satellite signals belonging to the target frequency mixing frequency band by adopting the second target local oscillator unit to obtain the second intermediate frequency signals.
According to the embodiment of the application, satellite signals received by each feed source of the tuner are subjected to frequency mixing processing by using different local oscillator units, intermediate frequency signals meeting the requirement of a preset set top box receiving frequency band can be output, a plurality of feed sources can work simultaneously, and mutual interference is avoided.
For the apparatus embodiment, since it is substantially similar to the method embodiment, it is described relatively simply, and reference may be made to the description of the method embodiment section for relevant points.
Referring to fig. 6, a schematic diagram of a low noise downconverter of an embodiment of the present application is shown. As shown in fig. 6, the low noise down converter 600 of the present embodiment includes: a processor 610, a memory 620, and a computer program 621 stored in the memory 620 and operable on the processor 610. The processor 610, when executing the computer program 621, implements steps in various embodiments of the signal processing method, such as steps S401 to S404 shown in fig. 4. Alternatively, the processor 610, when executing the computer program 621, implements the functions of each module/unit in each device embodiment described above, such as the functions of the modules 501 to 504 shown in fig. 5.
Illustratively, the computer program 621 may be divided into one or more modules/units, which are stored in the memory 620 and executed by the processor 610 to accomplish the present application. The one or more modules/units may be a series of computer program instruction segments capable of performing specific functions, which may be used to describe the execution of the computer program 621 in the low noise down converter 600. For example, the computer program 621 may be divided into a signal receiving control module, a frequency band determining module, a first frequency mixing module and a second frequency mixing module, and the specific functions of each module are as follows:
the signal receiving control module is used for controlling a plurality of feed sources of the low noise down converter to respectively receive satellite signals transmitted by a plurality of satellites, the plurality of satellites at least comprise a first satellite and a second satellite, and the plurality of feed sources at least comprise a first feed source and a second feed source;
a frequency band determining module, configured to determine a first frequency band corresponding to the first feed source and a second frequency band corresponding to the second feed source, where the first frequency band and the second frequency band are not overlapped with each other;
the first frequency mixing module is used for mixing the first satellite signal when the first feed source receives the first satellite signal transmitted by the first satellite and outputting a first intermediate frequency signal belonging to the first frequency band;
and the second frequency mixing module is used for mixing the second satellite signal when the second feed source receives the second satellite signal transmitted by the second satellite, and outputting a second intermediate frequency signal belonging to the second frequency band.
The low noise downconverter 600 may include, but is not limited to, a processor 610, a memory 620. Those skilled in the art will appreciate that fig. 6 is merely an example of a low noise downconverter 600 and is not intended to be limiting, and that the low noise downconverter 600 may include more or fewer components than shown, or some components may be combined, or different components, e.g., the low noise downconverter 600 may also include input and output devices, network access devices, buses, etc.
The Processor 610 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic device, discrete hardware component, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory 620 may be an internal storage unit of the low noise downconverter 600, such as a hard disk or a memory of the low noise downconverter 600. The memory 620 may also be an external storage device of the low noise downconverter 600, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), and the like, which are provided on the low noise downconverter 600. Further, the memory 620 may also include both an internal storage unit and an external storage device of the low noise down converter 600. The memory 620 is used to store the computer program 621 and other programs and data required by the low noise downconverter 600. The memory 620 may also be used to temporarily store data that has been output or is to be output.
The embodiment of the present application further discloses a computer program product, which, when running on the low noise down converter described in the foregoing embodiment, causes the low noise down converter to execute the signal processing method described in the foregoing method embodiment.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same. Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.

Claims (10)

1. A low noise downconverter, comprising:
the first feed source is used for receiving a first satellite signal transmitted by a first satellite;
the first local oscillator unit is electrically connected with the first feed source and is used for mixing the first satellite signal to obtain a first intermediate frequency signal belonging to a preset first frequency band;
the second feed source is independent from the first feed source and used for receiving a second satellite signal transmitted by a second satellite; and the number of the first and second groups,
and the second local oscillator unit is electrically connected with the second feed source and used for mixing the second satellite signal to obtain a second intermediate frequency signal belonging to a preset second frequency band, and the first frequency band and the second frequency band are not overlapped with each other.
2. The low noise downconverter of claim 1 further comprising:
the first filter is electrically connected with the first local oscillator unit and is used for filtering a first intermediate frequency signal and outputting the filtered first intermediate frequency signal, and the first filter is a filter matched with the first frequency band;
and the second filter is electrically connected with the second local oscillator unit and used for filtering a second intermediate frequency signal and outputting the filtered second intermediate frequency signal, and the second filter is a filter matched with the second frequency band.
3. The low noise down converter according to claim 1 or 2, wherein the second local oscillator units comprise a plurality of second local oscillator units, and the plurality of second local oscillator units are configured to respectively correspond to one mixing frequency band, and are configured to mix the second satellite signals belonging to the corresponding mixing frequency band to obtain the second intermediate frequency signals belonging to the preset second frequency band.
4. The low noise downconverter of claim 1 further comprising:
a third feed source which is configured independently from the first feed source and the second feed source and is used for receiving a third satellite signal transmitted by a third satellite;
and the third local oscillator unit is electrically connected with the third feed source and used for mixing the third satellite signal to obtain a third intermediate frequency signal belonging to a preset third frequency band, wherein the third frequency band is not overlapped with the first frequency band and the second frequency band.
5. A signal processing method applied to a low noise down converter, the signal processing method comprising:
controlling a plurality of feed sources of the low noise down converter to respectively receive satellite signals transmitted by a plurality of satellites, wherein the plurality of satellites at least comprise a first satellite and a second satellite, and the plurality of feed sources at least comprise a first feed source and a second feed source;
determining a first frequency band corresponding to the first feed source and a second frequency band corresponding to the second feed source, wherein the first frequency band and the second frequency band are not overlapped with each other;
when the first feed source receives a first satellite signal transmitted by the first satellite, mixing the first satellite signal, and outputting a first intermediate frequency signal belonging to the first frequency band;
and when the second feed source receives a second satellite signal transmitted by the second satellite, mixing the second satellite signal and outputting a second intermediate frequency signal belonging to the second frequency band.
6. The signal processing method according to claim 5, wherein said mixing the first satellite signal to output a first intermediate frequency signal belonging to the first frequency band comprises:
mixing the first satellite signal by adopting a first local oscillator unit electrically connected with the first feed source to obtain a first intermediate frequency signal;
and filtering the first intermediate frequency signal by adopting a first filter electrically connected with the first local oscillation unit, and outputting the filtered first intermediate frequency signal, wherein the first filter is a filter matched with the first frequency band.
7. The signal processing method according to claim 5 or 6, wherein the mixing the second satellite signal and outputting a second intermediate frequency signal belonging to the second frequency band comprises:
mixing the second satellite signal by adopting a second local oscillator unit electrically connected with the second feed source to obtain a second intermediate frequency signal;
and filtering the second intermediate frequency signal by adopting a second filter electrically connected with the second local oscillation unit, and outputting the filtered second intermediate frequency signal, wherein the second filter is a filter matched with the second frequency band.
8. The signal processing method according to claim 7, wherein the second local oscillator units include a plurality of local oscillator units, and the mixing the second satellite signal with the second local oscillator unit electrically connected to the second feed source to obtain a second intermediate frequency signal includes:
determining a target frequency mixing frequency band corresponding to a second target local oscillation unit, wherein the second target local oscillation unit is any one of a plurality of second local oscillation units;
and mixing a second satellite signal belonging to the target mixing frequency band by using the second target local oscillation unit to obtain the second intermediate frequency signal.
9. A low noise down converter comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the low noise down converter is the low noise down converter of any one of claims 1 to 4, and the processor implements the signal processing method of any one of claims 5 to 8 when executing the computer program.
10. A computer-readable storage medium storing a computer program, wherein the computer program, when executed by a processor of a low noise down converter according to any one of claims 1 to 4, implements a signal processing method according to any one of claims 5 to 8.
CN202010138553.9A 2019-12-27 2020-03-03 Low-noise down converter, signal processing method and storage medium Pending CN111294533A (en)

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