CN116208238A - Satellite signal receiving switching circuit - Google Patents
Satellite signal receiving switching circuit Download PDFInfo
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- CN116208238A CN116208238A CN202310501127.0A CN202310501127A CN116208238A CN 116208238 A CN116208238 A CN 116208238A CN 202310501127 A CN202310501127 A CN 202310501127A CN 116208238 A CN116208238 A CN 116208238A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
- H04B7/18515—Transmission equipment in satellites or space-based relays
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention provides a satellite signal receiving switching circuit which comprises a signal control module, a power supply module and a signal frequency reducing module, wherein the signal control module is used for controlling the signal frequency reducing module to output signals; the signal control module is used for sending a variable frequency control signal to the power supply module according to a signal receiving instruction sent by the SDR equipment; the power supply module provides a first power supply voltage or a second power supply voltage for the signal frequency-reducing module according to the received frequency conversion control signal; the signal down conversion module is used for down converting the received satellite signals and transmitting the satellite signals to the SDR equipment. According to the invention, the signal control module sends the variable frequency control signal according to the signal receiving instruction, the power supply module provides the power supply voltage with the preset protocol according to the variable frequency control signal, and the signal frequency reducing module receives satellite signals of corresponding frequency bands according to the power supply voltage, performs frequency reducing processing on the satellite signals and transmits the satellite signals to the SDR equipment, so that the problem that the SDR equipment and a satellite cannot directly perform signal communication is solved.
Description
Technical Field
The present invention relates to the field of signal receiving circuits, and in particular, to a satellite signal receiving switching circuit.
Background
Because the signal receiving and transmitting frequency band of the existing SDR (Software Defination Radio, radio broadcast communication) device and the frequency band of satellite signal communication are different, the SDR device cannot directly perform signal communication with a satellite, and a signal processing device such as a frequency converter is required to process satellite signals, but the existing SDR device and the signal processing device cannot directly perform communication, and the existing signal processing circuit is too complex and has limitation.
Disclosure of Invention
Aiming at the technical problems, the invention adopts the following technical scheme:
a satellite signal receiving switching circuit is used for being connected with SDR equipment, and the SDR equipment can receive satellite signals of a first frequency band.
A satellite signal reception switching circuit includes:
the signal control module is connected with the SDR equipment and is used for sending a variable frequency control signal according to a signal receiving instruction sent by the SDR equipment;
the power supply module is connected with the signal control module, and is used for providing a first power supply voltage or a second power supply voltage for the signal frequency-reducing module according to the received frequency conversion control signal, wherein the first power supply voltage or the second power supply voltage is generated according to a preset protocol;
the signal frequency reducing module is connected with the power supply module and the SDR equipment;
when the signal frequency reducing module receives a first power supply voltage, the frequency of a received first signal of a second frequency band is reduced to a first frequency band, and the first signal of the first frequency band is sent to SDR equipment;
when the signal frequency reducing module receives the second power supply voltage, the frequency of the received second signal of the third frequency band is reduced to the first frequency band, and the second signal of the first frequency band is sent to SDR equipment;
The second frequency band and the third frequency band are different, and the corresponding frequencies are higher than the frequencies of the first frequency band.
In one exemplary embodiment of the present application, an SDR device includes a signal receiving port connected to a signal down conversion module through a first transmission line, an impedance transformer, and a second transmission line connected in sequence;
the impedance transformer is used for controlling the impedance of the first transmission line to be a first impedance and controlling the impedance of the second transmission line to be a second impedance, and the second impedance is larger than the first impedance.
In one exemplary embodiment of the present application, the first transmission line and the second transmission line constitute a transmission line between the signal down-conversion module and the signal receiving port, and the mounting position of the impedance transformer thereon is determined by:
determining a plurality of analog mounting points on the transmission line between the signal frequency reducing module and the signal receiving port according to the length of the transmission line between the signal frequency reducing module and the signal receiving port and the preset interval length;
performing signal transmission attenuation simulation at each simulation mounting point to obtain the total attenuation rate of signals corresponding to each simulation mounting point;
comparing the signal overall attenuation rate corresponding to each analog mounting point with a preset signal overall attenuation rate threshold, and if the signal overall attenuation rate of the analog mounting point is smaller than or equal to the preset signal overall attenuation rate threshold, determining the signal overall attenuation rate as a target overall attenuation rate;
Clustering all target overall attenuation rates to obtain a plurality of target overall attenuation rate groups;
marking a target area where an analog mounting point corresponding to the target overall attenuation rate is located on a transmission line between the signal frequency-reducing module and the signal receiving port according to the marking color corresponding to the target overall attenuation rate group where each target overall attenuation rate is located;
any position in a target area marked on a transmission line between a signal down-conversion module and a signal receiving port is determined as an installation position of an impedance transformer.
In an exemplary embodiment of the present application, the preset interval length is determined by the following method:
presetting a plurality of sections of signal transmission lines, and determining a plurality of attenuation rate simulation points from each section of signal transmission line according to the length of each section of signal transmission line and the preset attenuation rate simulation interval length;
performing signal transmission attenuation simulation at each attenuation rate simulation point to obtain a simulation overall attenuation rate corresponding to each attenuation rate simulation point;
performing variance processing on all analog overall attenuation rates corresponding to each section of signal transmission line respectively to obtain variance values corresponding to each section of signal transmission line;
The length of the signal transmission line corresponding to the smallest variance value is determined as the section length.
In an exemplary embodiment of the present application, marking, on a transmission line between the signal down-conversion module and the signal receiving port, a target area where an analog mounting point corresponding to a target overall attenuation rate is located according to a marking color corresponding to a target overall attenuation rate group where each target overall attenuation rate is located, includes:
average value processing is carried out on all the target overall attenuation rates in each target overall attenuation rate class group, so that average overall attenuation rates corresponding to each target overall attenuation rate class group are obtained;
sequencing each average overall attenuation rate according to the descending order of the values to obtain a corresponding sequenced average overall attenuation rate;
k mark colors are obtained, each mark color is ordered according to the increasing sequence of the color degree, and the corresponding ordered mark color is obtained;
determining each sorted mark color as the mark color of the target overall attenuation rate group with the same sorted average overall attenuation rate as the sorting position;
and marking a target area where the analog mounting point corresponding to the target overall attenuation rate of each target overall attenuation rate group is located on a transmission line between the signal down-conversion module and the signal receiving port according to the marking color of each target overall attenuation rate group.
In an exemplary embodiment of the present application, according to the marking color of each target overall attenuation rate group, on a transmission line between the signal down-conversion module and the signal receiving port, a target area where an analog mounting point corresponding to the target overall attenuation rate of each target overall attenuation rate group is located is marked, and is replaced by:
determining the simulated installation point corresponding to each target overall attenuation rate as a target simulated installation point;
traversing all target simulation mounting points on a transmission line between a signal frequency reduction module and a signal receiving port, and if the target overall attenuation rate corresponding to the adjacent target simulation mounting points belongs to the same target overall attenuation rate group, merging the corresponding target areas to obtain each target area to be marked;
determining a target to-be-marked area with the largest length as a target marking area;
marking the target marking areas belonging to the target overall attenuation rate groups according to the marking colors of each target overall attenuation rate group;
determining any position in a target area marked on a transmission line between the signal down-conversion module and the signal receiving port as an installation position of the impedance transformer, and replacing the position with:
Any position in a target marking area marked on a transmission line between a signal down-conversion module and a signal receiving port is determined as an installation position of an impedance transformer.
In an exemplary embodiment of the present application, after determining the target to-be-marked area having the largest length as the target marking area, the method for determining the mounting position of the impedance transformer further includes:
if the sum of the lengths of all the target mark areas is larger than or equal to a preset target mark area total length threshold, sorting the lengths of the target mark areas corresponding to each target overall attenuation rate group according to the descending order of the color degrees of the mark colors corresponding to each target overall attenuation rate group to obtain the lengths of the target mark areas after sorting;
sequentially carrying out accumulation summation on the length of each ordered target marking area, and determining a target marking area corresponding to the length of the current ordered target marking area as a second target area and determining a target marking area corresponding to the length of the next ordered target marking area as a first marking area when the current accumulation sum is smaller than or equal to a preset target marking area total length threshold and the next accumulation sum is larger than the preset target marking area total length threshold;
Determining a target area with the length of q from the first mark area, and determining the target area as a first target area; q is the difference value of the cumulative sum of the total length threshold value of the preset target mark region and the length of the sequenced target mark region corresponding to the second target region;
and marking all the target mark areas in the accumulated sum of the lengths of the sequenced target mark areas corresponding to the first target area and the second target area according to the mark color of each target overall attenuation rate group.
In an exemplary embodiment of the present application, determining a target area with a length q from the first mark area, and determining the target area as a first target area includes:
a target area having a midpoint of the first mark area and a length of q is determined as a first target area.
In one exemplary embodiment of the present application, the target area of each simulated mounting point is determined by:
and determining an area taking the simulated mounting point as a midpoint and the preset interval length as the area length as a target area.
In one exemplary embodiment of the present application, the first supply voltage is higher than the second supply voltage, and the frequency of the second frequency band is higher than the frequency of the third frequency band.
The invention has at least the following beneficial effects:
according to the satellite signal receiving switching circuit, the signal control module sends the variable frequency control signal to the power supply module according to the signal receiving instruction sent by the SDR equipment, the power supply module provides the power supply voltage with a preset protocol to the signal frequency reducing module according to the variable frequency control signal, and the signal frequency reducing module receives satellite signals of corresponding frequency bands according to the power supply voltage, performs frequency reducing processing on the satellite signals and transmits the satellite signals to the SDR equipment, so that the problem that the existing SDR equipment and satellites cannot directly perform signal communication is solved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a connection block diagram of a satellite signal receiving switching circuit provided by the invention;
fig. 2 is a schematic circuit diagram of a first embodiment of a satellite signal receiving switching circuit according to the present invention;
Fig. 3 is a schematic circuit diagram of a second embodiment of a satellite signal receiving switching circuit according to the present invention;
fig. 4 is a schematic circuit diagram of a down-conversion control module of the satellite signal receiving switching circuit provided by the invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.
At present, the signal receiving and transmitting frequency band of the existing SDR equipment is 0-6GHz, and the main wave band of satellite signal communication is as follows: in order to enable the SDR device to receive satellite signals in each frequency band, special signal processing devices, such as a low noise down converter LNB, need to process the satellite signals, and convert high frequency signals of the satellite signals into low frequency signals, but the signals processed by the LNB still need to pass through other processing circuits before entering the SDR device, so that satellite communication cannot be directly performed between the SDR device and the LNB, so that in order to simplify the signal processing transmission process and improve the signal transmission efficiency, a satellite signal receiving switching circuit capable of realizing intercommunication between the SDR device and the LNB needs to be provided.
The satellite signal receiving switching circuit is connected with SDR equipment, and the SDR equipment can receive satellite signals of a first frequency band, as shown in figure 1, and comprises a signal control module, a power supply module and a signal frequency reduction module; the signal control module is connected with the SDR equipment and the power supply module and is used for sending a variable frequency control signal to the power supply module according to a signal receiving instruction sent by the SDR equipment; the power supply module is connected with the signal control module and the signal frequency-reducing module, and is used for providing a first power supply voltage or a second power supply voltage for the signal frequency-reducing module according to the received frequency-converting control signal, wherein the first power supply voltage or the second power supply voltage is generated according to a preset protocol; the signal down-conversion module is connected with the power supply module and the SDR equipment, and is used for down-converting the received satellite signals and transmitting the satellite signals to the SDR equipment.
The signal frequency reducing module is a double local oscillator down converter LNB, can receive satellite signals of two frequency bands, can receive a first signal of a second frequency band when receiving a first power supply voltage, reduces the frequency of the received first signal to the first frequency band, and sends the first signal after the frequency reduction to SDR equipment; when the signal frequency reducing module receives the second power supply voltage, the signal frequency reducing module can receive a second signal of a third frequency band, frequency reduces the frequency of the received second signal to a first frequency band, and the frequency-reduced second signal is sent to SDR equipment; the second frequency band and the third frequency band have differences, and the corresponding frequencies are higher than the frequencies of the first frequency band, specifically, the first power supply voltage is higher than the second power supply voltage, and the frequencies of the second frequency band are higher than the frequencies of the third frequency band, for example, the second frequency band is 11.9-12.75 GHz of the Ku wave band, and the third frequency band is 10.77-11.55 GHz of the Ku wave band.
The invention can be applied to equipment such as a set top box satellite receiver, a television satellite receiver, a PC card satellite receiver and the like, wherein a signal receiving instruction sent by SDR equipment comprises a frequency band of satellite signals to be received, a signal control module sends variable frequency control signals to a power supply module according to the signal receiving instruction, the power supply module provides power supply voltage with a preset protocol to a signal frequency reducing module according to the variable frequency control signals, the preset protocol is a data protocol with 22KHz tone signals, the 22KHz tone signals are used as carriers to be superposed on a direct current power supply rail of the signal frequency reducing module through a coaxial cable to control the conversion on-off of a signal receiving local oscillator of the signal frequency reducing module, and the signal frequency reducing module receives satellite signals of corresponding frequency bands according to the power supply voltage, for example, receives satellite signals of 9.75GHz when the power supply voltage is 13V, receives satellite signals of 10.6GHz when the power supply voltage is 18V, carries out frequency reducing treatment on the satellite signals and transmits the satellite signals to the SDR equipment.
As shown in fig. 2, a schematic circuit diagram of a satellite signal receiving switching circuit is shown, wherein the signal down-conversion module includes a VLNB port, the VLNB port is connected with a down-converter LNB, the power supply module includes a control chip J3, the signal control module includes a control chip J1, the control chip J1 may be an FPGA or an MCU, which may be disposed in an SDR device or disposed outside the SDR device and connected with the SDR device, an EXTM pin, a VCTRL pin, an SDA pin, an SCL pin and an EN pin of the control chip J1 are connected with the control chip J3, the control chip J3 supplies power to the LNB through the VLNB port, an impedance transformer is further disposed between the VLNB port and the SDR device, the SDR device includes a signal receiving port, the signal receiving port is connected with the signal down-conversion module through a first transmission line, the impedance transformer and a second transmission line sequentially connected, the impedance transformer is used for controlling the impedance of the first transmission line to be a first impedance, and controlling the impedance of the second transmission line to be a second impedance, and the second impedance is larger than the first impedance, the impedance is connected with the control chip J1, the control chip J3 supplies power to the LNB through the VLNB port and the signal receiving device, and the signal receiving device is matched with the signal receiving signal channel characteristics of the SDR device, and the signal is applied to the signal receiving channel and the signal channel is down-converted to the signal channel, and the signal channel is transmitted to the signal channel and has no reflection channel characteristics to the signal channel and has the signal channel characteristics and signal channel down-receiving channel and signal channel down function. The invention provides the I and C standard interface to control communication with SDR equipment, and the internal enabling, LNB voltage selecting, tone signal controlling and other settings are configured by the I/O port of the SDR equipment.
As shown in fig. 2, the LX pin of the control chip J3 is a switching node of the boost converter, for converting the output voltage; the VIN pin is an input pin of the internal offline regulator; the VCC pin is an internal power supply bias pin, and when the VIN pin is 5V, the VCC pin is connected with the VIN pin; the TCAP pin is connected to the ground through a 22nf capacitor C5, and controls the transition time of the VLNB voltage from 13V to 18V, so as to set the rise time and the fall time of the LNB output between 13V and 18V, because the internal boost converter of the IC has low bandwidth and slow response speed, the capacitor with the capacitance value can ensure that the boost converter can follow the voltage change, the charge-discharge current of the IC is 10uA, the transition time can be calculated by the formula Tcad (ms) =0.5×css (nf)/Iss (uA) =1.1 ms, and the voltage transition time of the circuit is calculated to be 1.1ms; the ISEL pin is connected with a 130K resistor R6 to limit the output current of the LNB, the precision is +/-10%, the IC can be prevented from overheating, when a short circuit condition occurs, the output current is kept for 4ms under the current limit, if the condition still exists, a boost converter in the IC enters a hiccup mode (namely, the overcurrent protection technology, when the output current is more than 120% of a rated value, the output voltage is immediately reduced to 0, namely, no voltage is output, a power supply module can be better protected, and the whole system is protected), and the system is restarted after 128 ms; fault is an open drain output pin that goes low when a fault occurs; the VCTRL pin controls VLNB, outputs 18V at H and 13V at GND; the EXTM pin superimposes a 22KHz tone signal at H; the BOOST pin is the output end of the BOOST converter, and is connected with two 22uf capacitors C152 and C153, so that the circuit efficiency and the load adjustment rate can reach the maximum value, and the transmission line between the triode DB2 and the LNB is a serpentine wiring, thereby playing a role of a choke coil.
If the SDR device is to receive satellite signals in multiple frequency bands, multiple LNBs are to be connected to the VLNB port of the signal down-conversion module, so, based on the first embodiment of the present invention, a second embodiment is provided, as shown in fig. 3, in which a down-conversion control module is added to a transmission line at the output end of the VLNB port and the power supply module, a power supply end of the down-conversion control module is connected to the power supply module, a signal end of the down-conversion control module is connected to the signal control module, and a transmission line between the down-conversion control module and the LNBs is a serpentine line, so as to play a role of a choke coil.
The frequency-reducing control module comprises a plurality of change-over switch groups, each change-over switch group comprises a plurality of relays, each change-over switch group is connected with four signal frequency-reducing modules, each relay is connected with the power supply module and the signal control module, and the on-off of each relay is controlled through a switch control signal. As shown in fig. 4, each change-over switch group comprises 6 relays, such as a normally-open relay K1, a normally-closed relay K2, a normally-open relay K3, a normally-closed relay K4, a normally-open relay K5 and a normally-closed relay K6; the relay K1 is connected with the first signal frequency-reducing module, the relay K2 is connected with the second signal frequency-reducing module, and the common end of the relay K1 and the relay K2 is connected with the relay K5; the relay K3 is connected with the third signal frequency-reducing module, the relay K4 is connected with the fourth signal frequency-reducing module, and the common end of the relay K3 and the relay K4 is connected with the relay K6; the common end of the relay K5 and the relay K6 is connected with a power supply module; the relay K1, the relay K2, the relay K3 and the relay K4 are connected with the P2 end of the signal control module together, and the relay K5 and the relay K6 are connected with the P1 end of the signal control module together; when the P1 end of the signal control module is at a high level, the relay K5 is turned on, and the relay K6 is turned off; when the P1 end of the signal control module is at a low level, the relay K5 is turned off, and the relay K6 is turned on; when the P2 end of the signal control module is at a high level, the relay K1 and the relay K3 are turned on, and the relay K2 and the relay K4 are turned off; when the P2 end of the signal control module is at a low level, the relay K1 and the relay K3 are turned off, the relay K2 and the relay K4 are turned on, and the four LNBs of the same change-over switch group are turned on and off through the interlocking of the six relays; the first signal down conversion module, the second signal down conversion module, the third signal down conversion module and the fourth signal down conversion module can receive different frequencies of satellite signals.
If more signal down conversion modules are to be controlled through the signal receiving circuit, the signal down conversion module can be realized by adding corresponding change-over switch groups, each change-over switch group controls four signal down conversion modules, each change-over switch group has the same structure, corresponding signal lines are added through different numbers of change-over switch groups, and the corresponding signal lines are connected with the signal control module, so that the purpose of controlling a plurality of signal down conversion modules is realized, and only one signal down conversion module works in the same period.
In practical application, if the impedance of the two lines is adjusted by converting the impedance of the two lines, the attenuation rate of each area on the signal transmission line needs to be detected and adjusted accordingly, if the data signal transmitted on the signal transmission line where the impedance transformer is located is attenuated, the attenuation rate of each area on the signal transmission line needs to be detected, and the attenuation rate of each area on the signal transmission line needs to be adjusted accordingly.
If the attenuation is caused by the signal attenuation caused by the impedance change on the signal transmission line, the impedance converter needs to be installed at a reasonable position on the line between the VLNB port and the signal receiving port, that is, at a position with the minimum attenuation rate, so as to solve the signal attenuation problem caused by the impedance conversion on the signal transmission line.
Therefore, the invention also provides a method for determining the installation position of the impedance converter on the transmission line between the signal down-conversion module and the signal receiving port, wherein the transmission line between the signal down-conversion module and the signal receiving port is composed of a first transmission line and a second transmission line, and the method for determining the installation position of the impedance converter on the transmission line comprises the following steps:
s100, determining a plurality of analog mounting points from the transmission line between the signal frequency reducing module and the signal receiving port according to the length of the transmission line between the signal frequency reducing module and the signal receiving port and the preset interval length; the analog mounting point is a point position of the data attenuation rate on the transmission line between the analog signal frequency-reducing module and the signal receiving port;
specifically, the length m of the transmission line between the signal down-conversion module and the signal receiving port and the preset interval length deltal are obtained 1 The method comprises the steps of carrying out a first treatment on the surface of the According to m and DeltaL 1 Determining n simulated mounting points; wherein n=m/Δl 1 -1；
Wherein, the preset intervalLength delta L 1 Is determined by the following method:
s110, presetting a plurality of sections of signal transmission lines, and determining a plurality of attenuation rate simulation points from each section of signal transmission line according to the length of each section of signal transmission line and the preset attenuation rate simulation interval length;
specifically, the length of the x-section preset signal transmission line is obtained to obtain a preset signal transmission line length set t= (T) 1 ,T 2 ,...,T y ,...,T x ) The method comprises the steps of carrying out a first treatment on the surface of the Wherein y=1, 2,..x; t (T) y The length of the signal transmission line preset for the y-th section; t is more than 0 1 ＜T 2 ＜...＜T y ＜...＜T x ＜m/2；
According to DeltaL 2 Determining a plurality of attenuation rate simulation points from each preset signal transmission line; wherein DeltaL 2 ＜T 1 ；ΔL 2 Simulating the section length for a preset attenuation rate;
s120, carrying out signal transmission attenuation simulation at each attenuation rate simulation point to obtain a simulation overall attenuation rate corresponding to each attenuation rate simulation point;
specifically, the simulated overall attenuation rate corresponding to each attenuation rate simulation point on each preset signal transmission line is obtained to obtain a simulated overall attenuation rate set D= (D) 1 ,D 2 ,...,D y ,...,D x )；D y =(D y1 ,D y2 ,...,D yf ,...,D yt(y) ) The method comprises the steps of carrying out a first treatment on the surface of the Wherein f=1, 2,. -%, t (y); t (y) is the number of attenuation rate simulation points of the signal transmission line preset in the y-th section; d (D) y A simulated total attenuation rate list corresponding to a signal transmission line preset for the y-th section; d (D) yf The method comprises the steps of setting a simulated overall attenuation rate corresponding to an f attenuation rate simulation point on a signal transmission line in a y-th section;
s130, performing variance processing on all analog overall attenuation rates corresponding to each section of signal transmission line respectively to obtain variance values corresponding to each section of signal transmission line; judging the discrete degree of the simulated overall attenuation rate on each section of signal transmission line through the obtained variance value;
specifically, for D y1 ,D y2 ,...,D yf ,...,D yt(y) Variance processing is carried out to obtain D y Corresponding variance value B y ；
S140, determining the length of the signal transmission line corresponding to the smallest variance value as the interval length;
specifically, MIN (B 1 ,B 2 ,...,B y ,...,B x ) The length of the corresponding preset signal transmission line is determined to be delta L 1 The method comprises the steps of carrying out a first treatment on the surface of the Wherein MIN () is a preset minimum value determination function;
the smaller the variance value, the closer the attenuation ratio of each attenuation ratio analog point on the corresponding signal transmission line is, the smaller the dispersion degree, and the smaller the attenuation ratio difference on the signal transmission line is, so the length of the signal transmission line corresponding to the smallest variance value is selected as the interval length, the attenuation ratio of each point tends to be equal in the length of the signal transmission line, the impedance transformer is mounted at any position in the length, the difference of the attenuation ratios is the smallest, and the optimal mounting distance of the impedance transformer is regarded.
S200, carrying out signal transmission attenuation simulation at each simulation mounting point to obtain the total attenuation rate of the signals corresponding to each simulation mounting point;
specifically, the signal overall attenuation rate corresponding to each analog mounting point is obtained, and a signal overall attenuation rate set G= (G) 1 ,G 2 ,...,G i ,...,G n )；G i =10*log(P 2i /P 1i ) The method comprises the steps of carrying out a first treatment on the surface of the Wherein i=1, 2, n; g i The signal total attenuation rate corresponding to the ith simulation installation point is calculated; p (P) 2i The power of the signal received by the signal frequency-reducing module corresponding to the ith analog installation point is calculated; p (P) 1i The power of the signal received by the signal receiving port corresponding to the ith analog installation point;
s300, comparing the signal overall attenuation rate corresponding to each analog mounting point with a preset signal overall attenuation rate threshold, and if the signal overall attenuation rate of the analog mounting point is smaller than or equal to the preset signal overall attenuation rate threshold, determining the signal overall attenuation rate as a target overall attenuation rate;
specifically, go through G 1 ,G 2 ,...,G i ,...,G n If G i ≤G 0 Will G i Determining the target overall attenuation rate to obtain a corresponding target overall attenuation rate set Q= (Q) 1 ,Q 2 ,...,Q a ,...,Q b ) The method comprises the steps of carrying out a first treatment on the surface of the Wherein a=1, 2, b; b is the number of target overall decay rates; q (Q) a The overall decay rate is the a-th target; g 0 A preset signal overall attenuation rate threshold value;
S400, clustering all target overall attenuation rates to obtain a plurality of target overall attenuation rate groups;
specifically, for Q 1 ,Q 2 ,...,Q a ,...,Q b Clustering is carried out to obtain k target overall attenuation rate groups;
the clustering can adopt a K-mean clustering method, and K target overall attenuation rate class groups are preset, and the target overall attenuation rates with high similarity are in the same target overall attenuation rate class group.
S500, determining the marking color of each target overall attenuation rate group, and marking a target area where an analog mounting point corresponding to the target overall attenuation rate is located on a transmission line between a signal frequency reduction module and a signal receiving port according to the marking color corresponding to the target overall attenuation rate group where each target overall attenuation rate is located;
wherein, step S500 further includes:
s510, carrying out average value processing on all the target overall attenuation rates in each target overall attenuation rate class group to obtain an average overall attenuation rate corresponding to each target overall attenuation rate class group;
s520, sorting each average overall attenuation rate according to the descending order of the values to obtain a corresponding sorted average overall attenuation rate set W= (W) 1 ,W 2 ,...,W c ,...,W k ) The method comprises the steps of carrying out a first treatment on the surface of the Wherein c=1, 2,..k; w (W) c The c-th average overall attenuation rate after sequencing according to the descending order of the values;
S530, obtaining k mark colors, and sorting each mark color according to the color degree increasing sequence to obtain a corresponding sorted mark color set Y= (Y) 1 ,Y 2 ,...,Y c ,...,Y k ) The method comprises the steps of carrying out a first treatment on the surface of the Wherein Y is c The c mark colors are sorted according to the increasing order of the color degrees;
s540, determining each sorted mark color as the mark color of the target overall attenuation rate group with the same sorted average overall attenuation rate as the sorting position; i.e. Y c Is determined as W c The marking color of the corresponding target overall attenuation rate class group;
the darker the color level of the marker color, the smaller the average overall attenuation rate in the corresponding target overall attenuation rate group, and the best the mounting position of the impedance transformer on the signal transmission line in the marker color.
S550, marking a target area where the analog mounting point corresponding to the target overall attenuation rate of each target overall attenuation rate group is located on a transmission line between the signal down-conversion module and the signal receiving port according to the marking color of each target overall attenuation rate group;
s600, any position in the target area marked on the transmission line between the signal down-conversion module and the signal receiving port is determined as the mounting position of the impedance transformer.
Wherein the target area of each simulated mounting point is determined by:
s601, taking the simulated mounting point as a midpoint, and taking a preset interval length delta L 1 Determining a region with a region length as a target region; or taking the simulated installation point as a starting point, taking the simulated installation point distance signal down conversion module delta L 1 The area where the point is the end point is determined as the target area.
In the first embodiment of the method for determining the installation position of the impedance transformer, each marking color is determined by simulating the attenuation rate, then the installation position of the impedance transformer is determined according to the target overall attenuation rate group corresponding to the marking color, the actual signal transmission line may not be marked on the actual signal transmission line due to the influence of external environment, for example, the signal transmission line is buried underground or located in a mine, if the attenuation rate calculation and marking are performed on the actual signal transmission line, the damage of the signal transmission line may be caused, and the maintenance cost may be correspondingly increased.
If the signal attenuation of the signal transmission line is caused by non-impedance transformation, such as the reason of the signal transmission line itself, such as the overlong length of the signal transmission line, the poor cable self characteristic of the signal transmission line, the large bending degree of the signal transmission line, etc., the invention can perform the attenuation rate simulation test on the signal transmission line to obtain the simulation attenuation rate corresponding to each area section on the signal transmission line, and then perform the marking display on the signal transmission line according to the simulation attenuation rate.
In order to further refine the installation position of the impedance transformer, the marks on the signal transmission line are reduced, so that the use of marking pigment is reduced, the pigment cost is saved, and a second embodiment of the installation position determining method of the impedance transformer is proposed as follows:
step S550 in the first embodiment is replaced with:
s551, determining the simulation installation point corresponding to each target overall attenuation rate as a target simulation installation point;
s552, traversing all target simulation mounting points on a transmission line between the signal frequency reduction module and the signal receiving port, and if the target overall attenuation rate corresponding to the adjacent target simulation mounting points belongs to the same target overall attenuation rate group, merging the corresponding target areas to obtain each target area to be marked;
S553, determining a target area to be marked with the maximum length as a target marking area;
specifically, the length of each target to-be-marked area corresponding to each target overall attenuation rate group is obtained to obtain a target to-be-marked area length set F= (F) 1 ,F 2 ,...,F c ,...,F k )；F c =(F c1 ,F c2 ,...,F cg ,...,F cd(c) ) The method comprises the steps of carrying out a first treatment on the surface of the Wherein, the liquid crystal display device comprises a liquid crystal display device,g=1, 2, d (c); d (c) is the number of target areas to be marked corresponding to the c-th target overall attenuation rate group; f (F) c A length list of a target to-be-marked area corresponding to the c-th target overall attenuation rate group; f (F) cg The length of the g target to-be-marked area corresponding to the c target overall attenuation rate group; MAX (F) c1 ,F c2 ,...,F cg ,...,F cd(c) ) The corresponding target to-be-marked area is determined as a c-th target marking area; MAX () is a preset maximum value determination function;
s5531, if the sum of the lengths of all the target mark areas is less than or equal to the preset total length threshold of the target mark area, executing step S554; otherwise, step S5532 is performed;
specifically, the length of each target mark region is obtained to obtain a target mark region length set e= (E) 1 ,E 2 ,...,E c ,...,E k ) The method comprises the steps of carrying out a first treatment on the surface of the Wherein E is c Length of the c-th target mark area; if sigma k c=1 E c ≤E 0 The method comprises the steps of carrying out a first treatment on the surface of the Step S554 is performed; otherwise, step S5532 is performed; wherein E is 0 A preset total length threshold value of the target mark area;
S5532, sorting the lengths of the target marking areas corresponding to each target overall attenuation rate group according to the descending order of the color degrees of the marking colors corresponding to each target overall attenuation rate group, so as to obtain a corresponding sorted target marking area length set R= (R) 1 ,R 2 ,...,R c ,...,R k ) The method comprises the steps of carrying out a first treatment on the surface of the Wherein R is c The length of the target mark area corresponding to the c-th target overall attenuation rate group after sequencing according to the descending order of the mark color degree;
s5533, sequentially carrying out accumulation summation on the lengths of each ordered target mark region, and executing step S5534 when the current accumulation summation is smaller than or equal to a preset target mark region total length threshold value and the next accumulation summation is larger than the preset target mark region total length threshold value; i.e. pair R 1 ,R 2 ,...,R c ,...,R k Sequentially summing, when the sum is satisfied c h=1 R h ≤E 0 And sigma (sigma) c+1 h=1 R h ＞E 0 Step S5534 is executed;
s5534, determining a target mark area corresponding to the length of the current sequenced target mark area as a second target area, and determining a target mark area corresponding to the length of the next sequenced target mark area as a first mark area;
s5535, determining a target area with the length of q from the first mark area, and determining the target area as a first target area; q is the difference value of the cumulative sum of the total length threshold value of the preset target mark region and the length of the sequenced target mark region corresponding to the second target region;
Namely from R c+1 Determining a target area with the length of q from the corresponding target mark areas, and determining the target area as a first target area; wherein q=e 0 -∑ c h=1 R h ；
The method for determining the first target area comprises the following steps:
s55351, will be marked with a first mark region (i.e. R c+1 Corresponding target mark region) is determined as a first target region with the middle point of the corresponding target mark region) as a midpoint and q as the region length;
s5536, according to the mark color of each target total attenuation rate group, all target mark areas in the accumulated sum of the lengths of the sequenced target mark areas corresponding to the first target area and the second target area (namely the first target area and R 1 ,R 2 ,...,R c Corresponding target marking area).
S554, marking the target marking areas belonging to the target overall attenuation rate groups according to the marking colors of the target overall attenuation rate groups; namely, marking the c target marking area through the c marking color;
step S600 is replaced with:
s610, any position in a target marking area marked on a transmission line between the signal down-conversion module and the signal receiving port is determined as an installation position of the impedance transformer.
By the second embodiment, the number of marking segments on the signal transmission line can be reduced, and only the segment with the best mounting position is marked, thereby saving the use of pigment.
Embodiments of the present invention also provide a non-transitory computer readable storage medium that may be disposed in an electronic device to store at least one instruction or at least one program for implementing one of the methods embodiments, the at least one instruction or the at least one program being loaded and executed by the processor to implement the methods provided by the embodiments described above.
Embodiments of the present invention also provide an electronic device comprising a processor and the aforementioned non-transitory computer-readable storage medium.
While certain specific embodiments of the invention have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the invention. Those skilled in the art will also appreciate that many modifications may be made to the embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.
Claims (10)
1. The satellite signal receiving switching circuit is characterized by being used for being connected with SDR equipment, wherein the SDR equipment can receive satellite signals of a first frequency band; the satellite signal reception switching circuit includes:
The signal control module is connected with the SDR equipment and is used for sending a variable frequency control signal according to a signal receiving instruction sent by the SDR equipment;
the power supply module is connected with the signal control module, and is used for providing a first power supply voltage or a second power supply voltage for the signal frequency-reducing module according to the received frequency conversion control signal, wherein the first power supply voltage or the second power supply voltage is generated according to a preset protocol;
the signal frequency reducing module is connected with the power supply module and the SDR equipment;
when the signal frequency reducing module receives the first power supply voltage, the frequency of a received first signal of a second frequency band is reduced to a first frequency band, and the first signal of the first frequency band is sent to the SDR equipment;
when the signal frequency reducing module receives the second power supply voltage, the frequency of a second signal of a received third frequency band is reduced to a first frequency band, and the second signal of the first frequency band is sent to the SDR equipment;
the second frequency band and the third frequency band are different, and the corresponding frequencies are higher than the frequencies of the first frequency band.
2. The satellite signal reception switching circuit of claim 1, wherein the SDR device comprises a signal receiving port connected to the signal down conversion module through a first transmission line, an impedance transformer, and a second transmission line connected in sequence;
The impedance transformer is used for controlling the impedance of the first transmission line to be a first impedance and controlling the impedance of the second transmission line to be a second impedance, and the second impedance is larger than the first impedance.
3. The satellite signal reception switching circuit of claim 2, wherein the first transmission line and the second transmission line constitute a transmission line between the signal down conversion module and the signal reception port, and the mounting position of the impedance transformer thereon is determined by:
determining a plurality of analog mounting points from the transmission line between the signal down-conversion module and the signal receiving port according to the length of the transmission line between the signal down-conversion module and the signal receiving port and the preset interval length;
performing signal transmission attenuation simulation at each simulation mounting point to obtain a signal overall attenuation rate corresponding to each simulation mounting point;
comparing the signal overall attenuation rate corresponding to each analog mounting point with a preset signal overall attenuation rate threshold, and if the signal overall attenuation rate of the analog mounting point is smaller than or equal to the preset signal overall attenuation rate threshold, determining the signal overall attenuation rate as a target overall attenuation rate;
Clustering all the target overall attenuation rates to obtain a plurality of target overall attenuation rate groups;
marking a target area where an analog mounting point corresponding to the target overall attenuation rate is located on a transmission line between the signal frequency-reducing module and the signal receiving port according to the marking color corresponding to the target overall attenuation rate group where each target overall attenuation rate is located;
any position in a target area marked on a transmission line between the signal down-conversion module and the signal receiving port is determined as an installation position of the impedance transformer.
4. A satellite signal reception switching circuit according to claim 3, wherein the preset interval length is determined by:
presetting a plurality of sections of signal transmission lines, and determining a plurality of attenuation rate simulation points from each section of signal transmission lines according to the length of each section of signal transmission lines and the preset attenuation rate simulation interval length;
performing signal transmission attenuation simulation at each attenuation rate simulation point to obtain a simulation overall attenuation rate corresponding to each attenuation rate simulation point;
performing variance processing on all the analog overall attenuation rates corresponding to each section of the signal transmission line respectively to obtain variance values corresponding to each section of the signal transmission line;
And determining the length of the signal transmission line corresponding to the smallest variance value as the interval length.
5. The satellite signal receiving switching circuit according to claim 3, wherein marking, on a transmission line between the signal down-conversion module and the signal receiving port, a target area where an analog mounting point corresponding to each target overall attenuation rate is located according to a mark color corresponding to a target overall attenuation rate class group where the target overall attenuation rate is located, comprises:
average value processing is carried out on all the target overall attenuation rates in each target overall attenuation rate class group, so that average overall attenuation rates corresponding to each target overall attenuation rate class group are obtained;
sequencing each average overall attenuation rate according to the descending order of the values to obtain a corresponding sequenced average overall attenuation rate;
k mark colors are obtained, each mark color is ordered according to the increasing sequence of the color degree, and the corresponding ordered mark color is obtained;
determining each sorted mark color as the mark color of the target overall attenuation rate group with the same sorted average overall attenuation rate as the sorting position;
and marking a target area where the analog mounting point corresponding to the target overall attenuation rate of each target overall attenuation rate group is located on a transmission line between the signal down-conversion module and the signal receiving port according to the marking color of each target overall attenuation rate group.
6. The satellite signal receiving switching circuit according to claim 5, wherein, according to the mark color of each of the target total attenuation rate groups, a target area where the analog mounting point corresponding to the target total attenuation rate of each of the target total attenuation rate groups is located is marked on a transmission line between the signal down-conversion module and the signal receiving port, instead of:
determining the simulation installation point corresponding to each target overall attenuation rate as a target simulation installation point;
traversing all target simulation installation points on a transmission line between the signal frequency reduction module and the signal receiving port, and if the target overall attenuation rates corresponding to the adjacent target simulation installation points belong to the same target overall attenuation rate group, merging the corresponding target areas to obtain each target area to be marked;
determining the target area to be marked with the maximum length as a target marking area;
marking the target marking areas belonging to the target overall attenuation rate groups according to the marking colors of the target overall attenuation rate groups;
determining any position in a target area marked on a transmission line between the signal down-conversion module and the signal receiving port as an installation position of the impedance transformer, and replacing the position with:
Any position in a target mark area marked on a transmission line between the signal down-conversion module and the signal receiving port is determined as an installation position of the impedance transformer.
7. The satellite signal reception switching circuit according to claim 6, wherein the method of determining the installation position of the impedance transformer after determining the target to-be-marked area having the largest length as the target mark area further comprises:
if the sum of the lengths of all the target mark areas is larger than a preset target mark area total length threshold, sorting the lengths of the target mark areas corresponding to each target overall attenuation rate group according to the descending order of the color degrees of the mark colors corresponding to each target overall attenuation rate group to obtain the lengths of the target mark areas after sorting;
sequentially carrying out accumulation summation on the length of each ordered target marking area, and determining the target marking area corresponding to the length of the current ordered target marking area as a second target area and determining the target marking area corresponding to the length of the next ordered target marking area as a first marking area when the current accumulation sum is smaller than or equal to a preset target marking area total length threshold and the next accumulation sum is larger than the preset target marking area total length threshold;
Determining a target area with the length of q from the first mark area, and determining the target area as a first target area; q is the difference value of the cumulative sum of the total length threshold value of the preset target mark region and the length of the sequenced target mark region corresponding to the second target region;
and marking all the target marking areas in the accumulated sum of the lengths of the sequenced target marking areas corresponding to the first target area and the second target area according to the marking color of each target overall attenuation rate group.
8. The satellite signal reception switching circuit according to claim 7, wherein determining a target area of length q from the first marker area and determining it as a first target area, comprises:
and determining the target area with the middle point of the first mark area as a middle point and q as the area length as a first target area.
9. A satellite signal reception switching circuit according to claim 3, wherein the target area of each of the analog mounting points is determined by:
and determining an area taking the simulated mounting point as a midpoint and taking the preset interval length as an area length as a target area.
10. The satellite signal reception switching circuit of claim 1, wherein the first supply voltage is higher than the second supply voltage and the second frequency band is higher than the third frequency band.
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1162218A (en) * | 1995-10-23 | 1997-10-15 | 汤姆森消费电子有限公司 | Device for controlling conversion gain of down converter |
| CN102137518A (en) * | 2010-01-25 | 2011-07-27 | 上海华为技术有限公司 | Doherty power amplifier and multi-frequency band signal parameter adjusting device |
| US20130202071A1 (en) * | 2010-07-14 | 2013-08-08 | Rda Technologies Limited | Lnb frequency down conversion integrated circuit and chip, lnb frequency down conversion circuit and method |
| JP2014127751A (en) * | 2012-12-25 | 2014-07-07 | Smart:Kk | Antenna, communication management system and communication system |
| CN106603089A (en) * | 2017-01-16 | 2017-04-26 | 北京星网卫通科技开发有限公司 | Multi-LNB multi-local-oscillation control method and device |
| CN108521292A (en) * | 2018-06-15 | 2018-09-11 | 常熟达顺威尔通信技术有限公司 | Ultra-broadband digital satellite beacon method of reseptance based on software radio and receiver |
| CN109450520A (en) * | 2018-12-04 | 2019-03-08 | 北京卫星信息工程研究所 | Satellite communication method and corresponding satellite communication terminal |
| CN110429943A (en) * | 2019-08-14 | 2019-11-08 | 北京信成未来科技有限公司 | A kind of general UHF/VHF micro-nano satellite telemetry station of hand-held and its implementation |
| CN110855325A (en) * | 2019-11-18 | 2020-02-28 | 湖南诚航电力科技有限公司 | Power line HPLC impedance transformation self-adaptive control method and device |
| US20220077877A1 (en) * | 2020-04-17 | 2022-03-10 | Parsons Corporation | Software-defined radio linking systems |
-
2023
- 2023-05-06 CN CN202310501127.0A patent/CN116208238B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1162218A (en) * | 1995-10-23 | 1997-10-15 | 汤姆森消费电子有限公司 | Device for controlling conversion gain of down converter |
| CN102137518A (en) * | 2010-01-25 | 2011-07-27 | 上海华为技术有限公司 | Doherty power amplifier and multi-frequency band signal parameter adjusting device |
| US20130202071A1 (en) * | 2010-07-14 | 2013-08-08 | Rda Technologies Limited | Lnb frequency down conversion integrated circuit and chip, lnb frequency down conversion circuit and method |
| JP2014127751A (en) * | 2012-12-25 | 2014-07-07 | Smart:Kk | Antenna, communication management system and communication system |
| CN106603089A (en) * | 2017-01-16 | 2017-04-26 | 北京星网卫通科技开发有限公司 | Multi-LNB multi-local-oscillation control method and device |
| CN108521292A (en) * | 2018-06-15 | 2018-09-11 | 常熟达顺威尔通信技术有限公司 | Ultra-broadband digital satellite beacon method of reseptance based on software radio and receiver |
| CN109450520A (en) * | 2018-12-04 | 2019-03-08 | 北京卫星信息工程研究所 | Satellite communication method and corresponding satellite communication terminal |
| CN110429943A (en) * | 2019-08-14 | 2019-11-08 | 北京信成未来科技有限公司 | A kind of general UHF/VHF micro-nano satellite telemetry station of hand-held and its implementation |
| CN110855325A (en) * | 2019-11-18 | 2020-02-28 | 湖南诚航电力科技有限公司 | Power line HPLC impedance transformation self-adaptive control method and device |
| US20220077877A1 (en) * | 2020-04-17 | 2022-03-10 | Parsons Corporation | Software-defined radio linking systems |
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