CN110708104B - Signal transmission method and device, circuit, terminal and antenna unit - Google Patents
Signal transmission method and device, circuit, terminal and antenna unit Download PDFInfo
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- CN110708104B CN110708104B CN201810744631.2A CN201810744631A CN110708104B CN 110708104 B CN110708104 B CN 110708104B CN 201810744631 A CN201810744631 A CN 201810744631A CN 110708104 B CN110708104 B CN 110708104B
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- 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
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
- H04B7/0802—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection
- H04B7/0805—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection with single receiver and antenna switching
- H04B7/0814—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection with single receiver and antenna switching based on current reception conditions, e.g. switching to different antenna when signal level is below threshold
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/1638—Special circuits to enhance selectivity of receivers not otherwise provided for
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- 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
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
- H04B7/0802—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection
- H04B7/0825—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection with main and with auxiliary or diversity antennas
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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
- H04B7/18517—Transmission equipment in earth stations
Abstract
The embodiment of the invention discloses a signal transmission method, a signal transmission device, a signal transmission circuit, a signal transmission terminal and an antenna unit. The signal transmission method comprises the following steps: receiving a radio frequency signal; and when the radio frequency signal is determined to be smaller than a set threshold value, switching a receiving path of the radio frequency signal from a first circuit with fixed bandwidth and gain to a second circuit with adjustable bandwidth and/or gain. According to the signal transmission method, the bandwidth and the gain of a receiving channel of the radio frequency signal are automatically adjusted according to the size of the current radio frequency signal, so that the receiving sensitivity can be improved, the continuity of the signal is kept, and the positioning accuracy of the mobile terminal in a severe environment is improved.
Description
Technical Field
The present invention relates to satellite navigation technologies, and in particular, to a signal transmission method and apparatus, a radio frequency signal processing circuit, a terminal, and an antenna unit.
Background
In the modern society, mobile terminals are increasingly rich in functions, including not only traditional communication functions, but also multimedia functions and satellite navigation positioning functions. In particular, the satellite navigation positioning function is a function which people depend on in daily travel.
At present, a receiving module of a satellite navigation system in a mobile terminal adopts a fixed receiving path, and under any environment, the receiving sensitivity (signal-to-noise ratio) of the fixed receiving path is fixed, so that the positioning of the satellite navigation positioning function of the mobile terminal is accurate for places with better signals, such as open and flat places, however, for places with poor signals, such as places with more shelters, the satellite navigation positioning of the mobile terminal is easy to make mistakes, which is because the satellite signals received by the mobile terminal are weak in severe environment, even the satellite signals are lost, and the positioning result is inaccurate.
Disclosure of Invention
In order to solve the existing technical problems, embodiments of the present invention provide a signal transmission method and apparatus, a radio frequency signal processing circuit, a terminal, and an antenna unit, which can optimize a signal receiving manner and improve positioning accuracy.
In order to achieve the above purpose, the technical solution of the embodiment of the present invention is realized as follows:
in a first aspect, an embodiment of the present invention provides a signal transmission method, including:
receiving a radio frequency signal;
and when the radio frequency signal is determined to be smaller than a set threshold value, switching a receiving path of the radio frequency signal from a first circuit with fixed bandwidth and gain to a second circuit with adjustable bandwidth and/or gain.
Wherein the receiving radio frequency signal comprises:
receiving a first radio frequency signal and a second radio frequency signal synchronously received by a first antenna and a second antenna;
when the radio frequency signal is determined to be smaller than the set threshold, switching a receiving path of the radio frequency signal from a first circuit with fixed bandwidth and gain to a second circuit with adjustable bandwidth and gain, comprising:
when the superposed signal of the first radio frequency signal and the second radio frequency signal is determined to be smaller than a set threshold value, a main set receiving path of the first radio frequency signal is switched from a first circuit with fixed bandwidth and gain to a second circuit with adjustable bandwidth and/or gain, and a diversity receiving path of the second radio frequency signal is switched from the first circuit with fixed bandwidth and gain to the second circuit with adjustable bandwidth and/or gain.
In a second aspect, an embodiment of the present invention provides a signal transmission apparatus, where the apparatus includes:
the receiving module is used for receiving radio frequency signals;
and the switching module is used for switching a receiving path of the radio frequency signal from a first circuit with fixed bandwidth and gain to a second circuit with adjustable bandwidth and/or gain when the radio frequency signal is determined to be smaller than a set threshold.
In a third aspect, an embodiment of the present invention provides a radio frequency signal processing circuit, where the radio frequency signal processing circuit includes the signal transmission apparatus according to any embodiment of the present invention and a radio frequency signal receiving path, and the radio frequency signal receiving path includes a first circuit with a fixed bandwidth and a fixed gain and a second circuit with an adjustable bandwidth and/or a adjustable gain.
The radio frequency signal processing circuit further comprises a first antenna and a second antenna, wherein the first antenna and the second antenna are respectively used for synchronously receiving a first radio frequency signal and a second radio frequency signal, the receiving path of the radio frequency signal comprises a main set receiving path and a diversity receiving path, the main set receiving path corresponds to the first antenna, the diversity receiving path corresponds to the second antenna, and the main set receiving path and the diversity receiving path respectively comprise a first circuit with fixed bandwidth and gain and a second circuit with adjustable bandwidth and/or gain.
The radio frequency signal processing circuit further comprises a first frequency divider and a first selection switch connected between the first antenna and the main set receiving path, and a second frequency divider and a second selection switch connected between the second antenna and the diversity receiving path, wherein the first selection switch and the second selection switch are respectively connected with the signal transmission device.
The radio frequency signal processing circuit further comprises a combiner connected to the output ends of the main set receiving path and the diversity receiving path, and the combiner combines a first output signal output by the main set receiving path and a second output signal output by the diversity receiving path.
Wherein the second circuit comprises a bandwidth-adjustable filter and/or a gain-adjustable amplifier connected in series.
In a fourth aspect, an embodiment of the present invention provides a terminal, where the apparatus includes a processor and a memory for storing a computer program capable of running on the processor; wherein the content of the first and second substances,
the processor is configured to execute the signal transmission method of the first aspect when the computer program is executed.
In a fifth aspect, an embodiment of the present invention provides a receiver unit, where the antenna unit includes the radio frequency signal processing circuit according to any embodiment of the present invention.
The signal transmission method and device, the radio frequency signal processing circuit, the terminal and the antenna unit provided by the embodiment of the invention comprise the following steps: receiving a radio frequency signal, and switching a receiving path of the radio frequency signal from a first circuit with fixed bandwidth and gain to a second circuit with adjustable bandwidth and/or gain when the radio frequency signal is determined to be smaller than a set threshold. When the radio frequency signal is smaller than the set threshold value, namely, under the condition of weak signal, the receiving path of the radio frequency signal is switched to the second circuit with adjustable bandwidth and/or gain, so that the bandwidth and/or gain can be adjusted through the second circuit, the signal-to-noise ratio of the receiving circuit of the radio frequency signal is changed, the receiving sensitivity is improved, and the positioning accuracy in a severe environment is improved. In addition, when the radio frequency signal does not reach the switching condition, that is, under the condition of strong signal, the receiving path of the radio frequency signal can be maintained in the first circuit with fixed bandwidth and gain, so that the power consumption can be saved, and the maximum cruising ability can be kept.
Drawings
FIG. 1 is a schematic diagram of a RF front-end circuit of a mobile terminal;
fig. 2 is a schematic flowchart illustrating a signal transmission method according to an embodiment of the invention;
FIG. 3 is a schematic diagram of a three-stage receiver;
FIG. 4 is a schematic diagram of a structure of a signal transmission apparatus according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of an RF signal processing circuit according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a terminal according to an embodiment of the present invention;
fig. 7 is a schematic view of an application scenario of a mobile terminal according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the following describes specific technical solutions of the present invention in further detail with reference to the accompanying drawings in the embodiments of the present invention. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
The satellite navigation positioning technology is a commonly used positioning technology and has the advantages of all weather, wide coverage, high three-dimensional fixed-speed timing precision, short positioning time and the like, so that the mobile terminal usually has a satellite signal receiving channel. Fig. 1 is a schematic diagram of a radio frequency front-end circuit of a mobile terminal, which is known in the art, and as shown in fig. 1, the radio frequency front-end circuit includes a satellite receiving path and a communication receiving path, wherein the satellite receiving path includes a first antenna 101, a frequency divider 102, a bandwidth filter 104, an amplifier 105, a narrow band filter 106, and a transceiver 107. The signals received by the first antenna 101 are usually mixed signals, such as satellite signals and WIFI signals, and the signal power intensity is weak, therefore, the mixed signals are divided by the frequency divider 102, one path of satellite signals enters a circuit composed of the bandwidth filter 104, the amplifier 105 and the narrow band filter 106 for filtering and amplifying, and finally the satellite signals are sent to the transceiver 107 for processing the satellite signals; in addition, a WIFI signal is sent to the WIFI processing module. The communication reception path includes a second antenna 108 for receiving a communication signal, a switch 109 for selecting which communication mode to enter, and a communication channel formed by a duplexer 110, which is fed to the transceiver 107 for processing the communication signal. Because the satellite receiving path adopts fixed bandwidth and gain and has fixed receiving sensitivity, when the satellite signal reaches the ground and the signal strength is high, the mobile terminal can receive the satellite signal; when the signal strength, which is the signal power strength, is small, the mobile terminal may lose the satellite signal, thereby reducing the positioning accuracy. In view of the above, embodiments of the present invention provide a signal transmission method capable of improving the receiving sensitivity by overcoming the above problems.
An aspect of the present invention provides a signal transmission method, which may be applied to a terminal, which may be a tablet device, a personal digital assistant, a mobile terminal, or the like. Referring to fig. 2, the signal transmission method includes the following steps:
optionally, the terminal receives the radio frequency signal by using an antenna. Generally, a set of antennas receives radio frequency signals including satellite signals and wireless signals. Because the satellite signal is different from other signal working frequency bands, the terminal can couple the antenna with the frequency divider, separate the satellite signal and transmit the satellite signal to the processor, and the processor calculates the quality parameter of the satellite signal according to the relevant interface file, wherein the quality parameter comprises signal power.
Wherein, since the receiving signal of the terminal is weak when the satellite altitude exceeds 20,000km, the threshold value is set in relation to the minimum signal power strength prescribed by the satellite system. Taking the Positioning using the Global Positioning System (GPS) as an example, since the minimum value of the signal strength of the C/a code in the L1 frequency band in the GPS System is-160 dBm given in the GPS ICD (Interface Control Document) file, the setting threshold may be determined to be-160 dBm.
In the signal transmission method provided in the foregoing embodiment, when the radio frequency signal is smaller than the set threshold, that is, under the condition of weak signal, the receiving path of the radio frequency signal is switched to the second circuit with adjustable bandwidth and/or gain, so that the bandwidth and/or gain can be adjusted by the second circuit to change the signal-to-noise ratio of the receiving path of the radio frequency signal, improve the receiving sensitivity, and further improve the positioning accuracy in a severe environment. When the radio frequency signal does not reach the switching condition, namely under the condition of strong signal, the receiving path of the radio frequency signal can be maintained in the first circuit with fixed bandwidth and gain, thereby saving power consumption and keeping maximum cruising ability.
Optionally, after switching the receiving path of the radio frequency signal to the second circuit with adjustable bandwidth and/or gain, the method further includes: and adjusting the bandwidth of an adjustable bandwidth filter and the gain of an adjustable gain amplifier in the second circuit according to the strength of the radio frequency signal.
The second circuit comprises an adjustable bandwidth filter and an adjustable gain amplifier which are connected in series, the adjustable bandwidth filter can correspondingly adjust the bandwidth of a receiving channel of the radio-frequency signal, and the adjustable gain amplifier can correspondingly adjust the gain of the receiving channel of the radio-frequency signal, so that the bandwidth and the gain of the second circuit can be respectively adjusted, the signal-to-noise ratio of the receiving circuit of the radio-frequency signal is changed, the receiving sensitivity is improved, and the positioning accuracy in a severe environment is improved. In an alternative embodiment, referring to fig. 3, according to the receiver noise theory, the receiving sensitivity expression may be as follows:
wherein F in the formula represents the overall receiving sensitivity, F 1 Representing the first-stage noise coefficient, F 2 Representing the second-stage noise coefficient, F 3 Representing the third-stage noise figure, G 1 Representing the first gain, G 2 Representing the 2 nd gain, G 3 Representing the 3 rd stage gain. Therefore, the noise received by the first stage and the second stage has the greatest influence on the whole receiving sensitivity, and for a pure-loss passive device, the loss of power values means that the noise increases corresponding power values, so that the bandwidth of the filter is tuned in real time through the second circuit with adjustable bandwidth and/or gain, and the second circuit is linked with the programmable gain amplifier, so that the receiving sensitivity can be improved, and the receiving stability can be kept.
Optionally, before receiving the radio frequency signal, the signal transmission method further includes: when the positioning function is determined not to be started, a receiving path of the radio frequency signal is switched to a first circuit with fixed bandwidth and gain; and/or when the radio frequency signal is determined to be larger than a preset value, switching a receiving path of the radio frequency signal from a second circuit with adjustable bandwidth and/or gain to a first circuit with fixed bandwidth and gain. Wherein the preset value may be greater than or equal to the set threshold.
In the signal transmission method provided in the foregoing embodiment, when the positioning function is not turned on, the radio frequency signal receiving path is in the first circuit with fixed bandwidth and fixed gain, thereby saving power consumption. When the radio-frequency signal is weakened from strong, a receiving path of the radio-frequency signal is switched from the first circuit to the second circuit with adjustable bandwidth and/or gain, so that the signal-to-noise ratio of the receiving circuit of the radio-frequency signal is changed, and the receiving sensitivity is improved; when the strength of the radio-frequency signal changes from weak to strong, and the strength of the radio-frequency signal is larger than a preset value, namely under the condition of strong signal, a receiving path of the radio-frequency signal is switched back to the first circuit with fixed broadband and gain from the second circuit with adjustable bandwidth and/or gain, so that the power consumption is saved, and the maximum cruising ability is kept. After a plurality of actual in-vehicle environment tests, if GPS positioning is used, the preset value can be-150 dBm.
Optionally, step 201, receiving a radio frequency signal, including:
and receiving a first radio frequency signal and a second radio frequency signal synchronously received by the first antenna and the second antenna.
The radio frequency signal includes a satellite signal and a wireless signal. The terminal includes a first antenna and a second antenna, and the first antenna and the second antenna are coupled to the frequency divider, respectively. The terminal synchronously receives satellite signals and wireless signals through the first antenna, synchronously receives satellite signals and communication signals through the second antenna, and the frequency divider separates out the satellite signals and sends the satellite signals to the processor.
when the superposed signal of the first radio frequency signal and the second radio frequency signal is determined to be smaller than a set threshold value, a main set receiving path of the first radio frequency signal is switched from a first circuit with fixed bandwidth and gain to a second circuit with adjustable bandwidth and/or gain, and a diversity receiving path of the second radio frequency signal is switched from the first circuit with fixed bandwidth and gain to the second circuit with adjustable bandwidth and/or gain.
Before determining that a superposed signal of the first radio frequency signal and the second radio frequency signal is smaller than a set threshold, the method further comprises: and superposing the first radio frequency signal and the second radio frequency signal to obtain a superposed signal.
In the signal transmission method provided by the above embodiment, the main and diversity receiving paths are adopted to synchronously receive and process the radio frequency signal, and the radio frequency signals processed by the main and diversity receiving paths are combined, so that the strength of the radio frequency signal is improved, and the positioning accuracy in a severe environment is further improved. According to the fact that the superposed signal of the first radio frequency signal and the second radio frequency signal is smaller than the set threshold value, the main diversity receiving path and the diversity receiving path are synchronously switched to the second circuit with adjustable bandwidth and/or gain, and therefore the bandwidth and/or the gain can be adjusted through the second circuit, the signal-to-noise ratio of the main diversity receiving path is changed, receiving sensitivity is improved, and positioning accuracy in a severe environment is improved. When the switching condition is not reached, namely under the condition of strong signal, the main branch receiving path and the main branch receiving path can be maintained in the first circuit with fixed bandwidth and fixed gain, so that the power consumption can be saved, and the maximum cruising ability can be kept.
Optionally, the signal transmission method further includes: when the positioning function is determined not to be executed, the main set receiving path of the first radio frequency signal is in the first circuit with fixed bandwidth and gain, and the diversity receiving path of the second radio frequency signal is in the first circuit with fixed bandwidth and gain.
In the signal transmission method provided by the above embodiment, when the terminal does not turn on the positioning function, the main and diversity receiving paths are in the first circuit with fixed bandwidth and gain, so that power consumption can be saved.
Optionally, the signal transmission method further includes: and when the superposed signal of the first radio frequency signal and the second radio frequency signal is determined to be larger than a preset value, switching a main set receiving path of the first radio frequency signal from a second circuit with adjustable bandwidth and/or gain to a first circuit with fixed bandwidth and gain, and switching a diversity receiving path of the second radio frequency signal from the second circuit with adjustable bandwidth and/or gain to the first circuit with fixed bandwidth and gain. Wherein the preset value is greater than the set threshold.
In the signal transmission method provided in the foregoing embodiment, after the strength of the superimposed signal between the first radio frequency signal and the second radio frequency signal changes from weak to strong, when the strength of the superimposed signal is greater than a preset value, that is, under the condition of strong signal, the main and diversity receiving paths are switched from the second circuit with adjustable bandwidth and/or gain to the first circuit with fixed bandwidth and gain, thereby saving power consumption and maintaining maximum cruising ability.
Optionally, after the switching the main set receiving path of the first radio frequency signal from the first circuit with fixed bandwidth and gain to the second circuit with adjustable bandwidth and/or gain, and the switching the diversity receiving path of the second radio frequency signal from the first circuit with fixed bandwidth and gain to the second circuit with adjustable bandwidth and/or gain, the method further includes: and adjusting the bandwidth of an adjustable bandwidth filter and the gain of an adjustable gain amplifier in the second circuit according to the strength of the radio frequency signal.
Wherein, the switching between the first circuit and the second circuit can be realized by switching of a switch. The first circuit comprises a fixed bandwidth filter and a fixed gain amplifier which are connected in series, the second circuit comprises an adjustable bandwidth filter and an adjustable gain amplifier which are connected in series, the adjustable bandwidth filter can correspondingly adjust the bandwidth of a receiving channel of a radio-frequency signal, and the adjustable gain amplifier can correspondingly adjust the gain of the receiving channel of the radio-frequency signal, so that the bandwidth and the gain of the second circuit can be adjusted respectively, the signal-to-noise ratio of the receiving circuit of the radio-frequency signal is changed, the receiving sensitivity is improved, and the positioning accuracy in a severe environment is improved. Taking the rf signal as the GPS signal, the bandwidth of the adjustable bandwidth filter and the gain of the adjustable gain amplifier (PGA) in the second circuit of the main-set receiving path and the diversity receiving path are respectively adjusted according to a logic control table according to the signal strength of the rf signal, where the logic control table can be shown as the following table:
in the signal transmission method provided in the foregoing embodiment, the receiving path of the radio frequency signal includes a main set receiving path and a diversity receiving path, where the main set receiving path and the diversity receiving path respectively include a first circuit with fixed bandwidth and gain and a second circuit with adjustable bandwidth and/or gain, and the main set receiving path and the diversity receiving path are respectively coupled to the first antenna and the second antenna, so as to change a single receiving mode, optimize the receiving mode, enhance the signal strength, maintain the continuity of the signal, and further achieve the purpose of improving the positioning accuracy.
In another aspect of the present invention, a signal transmission apparatus is also provided, referring to fig. 4, the apparatus includes a receiving module 401 and a switching module 402, wherein,
the receiving module 401 is configured to receive a radio frequency signal;
the switching module 402 is configured to switch a receiving path of the radio frequency signal from a first circuit with a fixed bandwidth and gain to a second circuit with an adjustable bandwidth and/or gain when it is determined that the radio frequency signal is smaller than a set threshold.
Optionally, the receiving module 401 is specifically configured to receive a first radio frequency signal and a second radio frequency signal that are synchronously received by a first antenna and a second antenna; the switching module 402 is specifically configured to, when it is determined that a superimposed signal of the first radio frequency signal and the second radio frequency signal is smaller than a set threshold, switch a main set receiving path of the first radio frequency signal from a first circuit with fixed bandwidth and gain to a second circuit with adjustable bandwidth and/or gain, and switch a diversity receiving path of the second radio frequency signal from the first circuit with fixed bandwidth and gain to the second circuit with adjustable bandwidth and/or gain.
In another aspect of the present invention, a radio frequency signal processing circuit is provided, please refer to fig. 5, where the radio frequency signal processing circuit includes the signal transmission apparatus according to any embodiment of the present application, and a receiving path of a radio frequency signal, where the receiving path of the radio frequency signal includes a first circuit with a fixed bandwidth and gain, and a second circuit with an adjustable bandwidth and/or gain.
In the radio frequency signal processing circuit provided in the foregoing embodiment, according to that the radio frequency signal received by the signal transmission device is smaller than the set threshold, the receiving path of the radio frequency signal is switched from the first circuit with fixed bandwidth and gain to the second circuit with adjustable bandwidth and/or gain, so as to change the signal-to-noise ratio of the receiving path of the radio frequency signal, improve the receiving sensitivity, and further improve the positioning accuracy in a severe environment.
Optionally, the radio frequency signal processing circuit further includes a first antenna 503 and a second antenna 513, where the first antenna 503 and the second antenna 513 are respectively configured to synchronously receive a first radio frequency signal and a second radio frequency signal, the receiving paths of the radio frequency signals include a main set receiving path 501 corresponding to the first antenna and a diversity receiving path 502 corresponding to the second antenna, respectively, and the main set receiving path 501 and the diversity receiving path 502 respectively include a first circuit with fixed bandwidth and gain and a second circuit with adjustable bandwidth and/or gain.
In the radio frequency circuit provided in the foregoing embodiment, a first receiving antenna and a second receiving antenna are used to receive radio frequency signals synchronously, and the first antenna is coupled to a main set receiving path and the second antenna is coupled to a diversity receiving path; meanwhile, the main diversity receiving path adopts a first circuit with fixed bandwidth and gain and a second circuit with adjustable bandwidth and/or gain, so that the single receiving mode is changed, the receiving mode is optimized, and the receiving is always in the optimal state.
Further, the radio frequency signal processing circuit further includes a first frequency divider 504 and a first selection switch 506 connected between the first antenna 503 and the main set receiving path 501, and a second frequency divider 515 and a second selection switch 516 connected between the second antenna 513 and the diversity receiving path 502, the first selection switch 506 and the second selection switch 516 are respectively connected to the signal transmission device, and the other ends of the first selection switch 506 and the second selection switch 516 are respectively connected to the narrow band filter 512.
Further, the radio frequency signal processing circuit further includes a combiner 517 connected to output ends of the main set receiving path 501 and the diversity receiving path 502, where the combiner 517 combines a first output signal output by the main set receiving path and a second output signal output by the diversity receiving path.
In the radio frequency signal processing circuit provided in the above embodiment, the combiner is used to combine the output signal of the main receiving path and the output signal of the diversity receiving path, and the signal strength of the output signal is at least improved by 3dbm compared with the output signal of a single receiving path, so that the risk of losing the radio frequency signal is reduced, and the accuracy of positioning in a severe environment is improved.
Further, the second circuit comprises a bandwidth adjustable filter 509 and/or a gain adjustable amplifier 510 connected in series.
For example, in the mobile terminal, a first antenna receives a first GPS and WIFI signal, and sends the first GPS signal to the GPS main set processing path 501 and sends WIFI to the WIFI processing circuit by using the first frequency divider 504; the second antenna receives the second GPS and communication signals, and the second GPS signal is sent to the GPS diversity processing path 502 by the second frequency divider 515, and the communication signal is sent to the communication path including the duplexer 519 via the changeover switch 514. Wherein the GPS master set path 501 comprises a first circuit consisting of a fixed bandwidth filter 507 and a fixed gain amplifier 508 and a second circuit consisting of a bandwidth adjustable filter 509 and/or a gain adjustable amplifier 510; the GPS diversity path 502 includes a first circuit consisting of a fixed bandwidth filter 507 and a fixed gain amplifier 508 and a second circuit consisting of a bandwidth adjustable filter 509 and/or a gain adjustable amplifier 510; the first GPS signal is filtered and amplified by a GPS main set processing path 501, and the GPS signal is enhanced; the second GPS signal is filtered and amplified by the GPS diversity processing path 502, and the signal is enhanced; finally, the processed first GPS signal and the processed second GPS signal are combined into a GPS signal with power increased by at least 3dbm by combiner 517. The GPS signals are finally transmitted to the transceiver 518. Wherein the controller 511 adjusts the bandwidth of the bandwidth adjustable filter and/or the gain of the gain adjustable amplifier based on the superimposed signal of the unprocessed first GPS signal and the unprocessed second GPS signal.
In the above embodiment, the number of the main set receiving path and the diversity receiving path in the radio frequency signal processing circuit is one, optionally, the number of the diversity receiving paths may also be two or more, and the working principles of the diversity receiving paths may be the same, which is not described herein again.
In another aspect of the present invention, an antenna unit of a receiver is further provided, where the antenna unit includes the radio frequency signal processing circuit provided in any embodiment of the present application.
In another aspect of the present invention, a terminal is further provided, and fig. 6 is a schematic structural diagram of a terminal according to an alternative embodiment of the present invention, where the terminal 600 includes: a memory 601 and a processor 602. The memory 601 comprises means for storing a computer program executable on the processor 602, wherein the processor, when executing the computer program, is adapted to perform: a method of signal transmission, comprising: receiving a radio frequency signal; and when the radio frequency signal is determined to be smaller than a set threshold value, switching a receiving path of the radio frequency signal from a first circuit with fixed bandwidth and gain to a second circuit with adjustable bandwidth and/or gain.
The processor is further configured to, when executing the computer program, perform:
the receiving radio frequency signal comprises: receiving a first radio frequency signal and a second radio frequency signal synchronously received by a first antenna and a second antenna;
when the radio-frequency signal is determined to be smaller than the set threshold, switching a receiving path of the radio-frequency signal from a first point path with fixed bandwidth and gain to a second circuit with adjustable bandwidth and gain, comprising: when the superposed signal of the first radio frequency signal and the second radio frequency signal is determined to be smaller than a set threshold value, a main set receiving path of the first radio frequency signal is switched from a first circuit with fixed bandwidth and gain to a second circuit with adjustable bandwidth and/or gain, and a diversity receiving path of the second radio frequency signal is switched from the first circuit with fixed bandwidth and gain to the second circuit with adjustable bandwidth and/or gain.
Optionally, the terminal further comprises an antenna unit 603, a communication bus 604, and a user interface 605, wherein the antenna unit 603 is configured to physically receive and process signals. The communication bus 604 is used to enable connection communication of these components. The user interface 605 is used for receiving an operation instruction input by a user, such as an operation of starting a positioning function input by the user.
In order to understand the implementation of the signal transmission method and the working principle of the rf signal processing circuit of the present application, the following rf signal is taken as a satellite signal as an example, and the working mode of the mobile terminal including the rf signal processing circuit is further specifically described, please refer to fig. 7, which is a schematic view of an application scenario of the mobile terminal provided in an embodiment of the present invention, and the mobile terminal is disposed in a vehicle moving on the ground. If the satellites 701 to 703 are required to be accurately positioned, the position information can be correctly resolved by generally requiring at least 3 signals of the satellites 701 to 703, and the step of receiving the signals by the mobile terminal through the radio frequency signal processing circuit includes:
the mobile terminal 707 detects a positioning instruction input by a user, starts a GPS function, receives a GPS signal through the first antenna 705 and the second antenna 706, performs satellite search, and performs positioning according to the received GPS signal. The mobile terminal synchronously receives the GPS signals acquired by the first antenna 705 and the second antenna 706 through a main diversity receiving path and a diversity receiving path in the radio frequency signal processing circuit, and the main diversity receiving path is in the first circuit with fixed bandwidth and gain.
When the received GPS signal is detected to be less than a set threshold value, such as-160 dbm, the main diversity receiving path is respectively switched to a second circuit with adjustable bandwidth and/or gain, and the noise coefficient is adjusted by increasing the bandwidth of a filter and reducing the gain of an amplifier, so that the receiving sensitivity is improved. The noise coefficient in the path is adjusted to ensure that the processed GPS signal is kept in a strong signal in real time, thereby ensuring the continuity of the signal.
When the vehicle 704 travels to an open place and detects that the GPS signal is in a strong signal, that is, the GPS signal strength is higher than a preset value, for example, -150dbm, the main diversity receiving path is switched from the second circuit to the first circuit with fixed bandwidth and gain, so that the power can be saved and the maximum cruising ability can be maintained. If the GPS signal is detected to be in the weak signal or the strong signal again, the steps can be repeated to correspondingly switch the main and diversity receiving paths to the first circuit or the second circuit so as to meet the positioning requirement of ensuring that the processed GPS signal is kept in the strong signal in real time.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. The scope of the invention is to be determined by the scope of the appended claims.
Claims (10)
1. A method of signal transmission, the method comprising:
receiving a radio frequency signal;
and when the strength of the radio frequency signal is determined to be smaller than a set threshold, switching a receiving path of the radio frequency signal from a first circuit with fixed bandwidth and gain to a second circuit with adjustable bandwidth and/or gain.
2. The method of claim 1, wherein receiving the radio frequency signal comprises:
receiving a first radio frequency signal and a second radio frequency signal synchronously received by a first antenna and a second antenna;
when the strength of the radio frequency signal is determined to be smaller than a set threshold, switching a receiving path of the radio frequency signal from a first circuit with fixed bandwidth and gain to a second circuit with adjustable bandwidth and gain, comprising:
when the strength of the superposed signal of the first radio frequency signal and the second radio frequency signal is determined to be smaller than a set threshold value, a main set receiving path of the first radio frequency signal is switched from a first circuit with fixed bandwidth and gain to a second circuit with adjustable bandwidth and/or gain, and a diversity receiving path of the second radio frequency signal is switched from the first circuit with fixed bandwidth and gain to the second circuit with adjustable bandwidth and/or gain.
3. A signal transmission apparatus, characterized in that the apparatus comprises:
the receiving module is used for receiving radio frequency signals;
and the switching module is used for switching a receiving path of the radio-frequency signal from a first circuit with fixed bandwidth and gain to a second circuit with adjustable bandwidth and/or gain when the strength of the radio-frequency signal is determined to be smaller than a set threshold.
4. A radio frequency signal processing circuit, characterized in that it comprises a signal transmission device as claimed in claim 3 and a reception path for a radio frequency signal, said reception path for a radio frequency signal comprising a first circuit of fixed bandwidth and gain and a second circuit of adjustable bandwidth and/or gain.
5. The circuit of claim 4, wherein the radio frequency signal processing circuit further comprises a first antenna and a second antenna, the first antenna and the second antenna are respectively configured to synchronously receive a first radio frequency signal and a second radio frequency signal, the reception path of the radio frequency signal comprises a main set reception path corresponding to the first antenna and a diversity reception path corresponding to the second antenna, respectively, and the main set reception path and the diversity reception path respectively comprise a first circuit with fixed bandwidth and fixed gain and a second circuit with adjustable bandwidth and/or adjustable gain.
6. The circuit of claim 5, wherein the radio frequency signal processing circuit further comprises a first frequency divider and a first selection switch connected between the first antenna and the main set reception path, and a second frequency divider and a second selection switch connected between the second antenna and the diversity reception path, the first selection switch and the second selection switch being respectively connected to the signal transmission device.
7. The circuit of claim 5, wherein the radio frequency signal processing circuit further comprises a combiner coupled to outputs of the main set receive path and the diversity receive path, the combiner configured to combine a first output signal from the main set receive path and a second output signal from the diversity receive path.
8. A circuit according to any one of claims 4 to 7, wherein the second circuit comprises a bandwidth adjustable filter and/or a gain adjustable amplifier connected in series.
9. A terminal, characterized in that the terminal comprises a processor and a memory for storing a computer program capable of running on the processor; wherein the content of the first and second substances,
the processor is configured to execute the signal transmission method according to claim 1 or 2 when the computer program is executed.
10. A receiver antenna unit, characterized in that the antenna unit comprises a radio frequency signal processing circuit according to any of claims 4 to 8.
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