CN115276694B - Frequency hopping receiver and gain automatic control method thereof - Google Patents
Frequency hopping receiver and gain automatic control method thereof Download PDFInfo
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- CN115276694B CN115276694B CN202211072474.8A CN202211072474A CN115276694B CN 115276694 B CN115276694 B CN 115276694B CN 202211072474 A CN202211072474 A CN 202211072474A CN 115276694 B CN115276694 B CN 115276694B
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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
- H04B1/30—Circuits for homodyne or synchrodyne receivers
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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
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
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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
- H04B1/69—Spread spectrum techniques
- H04B1/713—Spread spectrum techniques using frequency hopping
- H04B1/715—Interference-related aspects
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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
- H04B1/30—Circuits for homodyne or synchrodyne receivers
- H04B2001/307—Circuits for homodyne or synchrodyne receivers using n-port mixer
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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
- H04B1/69—Spread spectrum techniques
- H04B1/713—Spread spectrum techniques using frequency hopping
- H04B1/715—Interference-related aspects
- H04B2001/7152—Interference-related aspects with means for suppressing interference
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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
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- 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 discloses a frequency hopping receiver and a gain automatic control method thereof, comprising a frequency conversion band-pass filter, a first variable gain module, a second variable gain module, a third variable gain module, a first detector for detecting the signal power of the input end of the first variable gain module, a second detector for detecting the signal power of the input end of the second variable gain module, a third detector for detecting the signal power of the input end of the third variable gain module, a controller, a first intermediate frequency filter circuit, a second intermediate frequency filter circuit, a high-speed analog-to-digital converter, a multichannel analog-to-digital converter and a frequency source; the signal received by the antenna sequentially passes through a variable frequency band-pass filter, a first variable gain module, a first intermediate frequency filter circuit, a second variable gain module, a second intermediate frequency filter circuit and a third variable gain module to be electrically connected with the controller; and the controller adjusts the gains of the first variable gain module, the second variable gain module and the third variable gain module according to the received first voltage value, the second voltage value and the third voltage value, so as to realize automatic control of the receiving gains.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a frequency hopping receiver and a gain automatic control method thereof.
Background
The current frequency hopping radio station is widely applied to important communication fields such as military and the like, and uses space electromagnetic waves as a transmission channel to remotely transmit electric signals, frequency fading effects are generated under the influence of factors such as distance, diffraction, fading and the like, the signal intensity of frequency hopping carrier signals with different frequencies reaching a receiving end is discrete, and the amplitude fluctuation is drastic, so that the normal demodulation of a receiver is influenced. In addition, the communication distance between the stations is different, and the signal strength received by the receiving end is also greatly different, so that the performance of the receiving end is reduced and the receiving end is abnormal if no effective measures are taken. Therefore, an Automatic Gain Control (AGC) function is adopted for adjustment in the receiver design.
In some published patent or technical literature libraries, there are some descriptions about automatic gain control of a receiver, most of the descriptions are biased and composed of circuit architecture, specific control methods and strategies are lacking for actual application scenes of frequency hopping radio stations, applicability is not high, and defects are obvious. For example: the high-speed frequency hopping automatic gain control method has two obvious defects that the low-speed synchronous and high-speed data communication signals are received by adopting a split channel: firstly, the hardware overhead cost is increased, and secondly, the low-speed synchronous receiving channel also has device saturation and signal distortion under the near-field large-signal environment, so that the synchronous success rate is reduced.
Disclosure of Invention
In order to solve the problems of the defects and the defects existing in the prior art, the invention provides a frequency hopping receiver and a gain automatic control method thereof, which cover the actual application scene of a frequency hopping radio station and improve the effectiveness and the reliability of an automatic gain control circuit in the frequency hopping radio station on the basis of ensuring the response speed, the control precision and the dynamics.
In order to achieve the above purpose of the present invention, the following technical scheme is adopted:
a frequency hopping receiver comprises a first detector, a second detector, a third detector, a first variable gain module, a second variable gain module, a third variable gain module, a multichannel analog-to-digital converter, a controller, a frequency conversion band-pass filter, a first intermediate frequency filter and a second intermediate frequency filter;
the variable frequency band-pass filter, the first variable gain module, the first intermediate frequency filter, the second variable gain module, the second intermediate frequency filter, the third variable gain module and the controller are electrically connected in sequence;
the first detector is used for detecting the signal power intensity of the input end of the first variable gain module, the sampling detection point is arranged between the variable frequency band-pass filter and the first variable gain module, and the first detector converts the signal power intensity of the input end of the first variable gain module into a voltage value which is called a first voltage value;
the second detector is used for detecting the signal power intensity of the input end of the second variable gain module, the sampling detection point is arranged between the first intermediate frequency filter and the second variable gain module, and the second detector converts the signal power intensity of the input end of the second variable gain module into a voltage value which is called a second voltage value;
the third detector is used for detecting the signal power intensity of the input end of the third variable gain module, the sampling detection point is arranged between the second intermediate frequency filter and the third variable gain module, and the third detector converts the signal power intensity of the input end of the third variable gain module into a voltage value which is called a third voltage value;
the first variable gain module is used for amplifying or attenuating radio frequency signals, and the gain is controlled by the controller;
the second variable gain module is used for amplifying or attenuating the first intermediate frequency signal, and the gain is controlled by the controller;
the third variable gain module is used for amplifying or attenuating the second intermediate frequency signal, and the gain is controlled by the controller;
the multichannel analog-to-digital converter is arranged between the first detector, the second detector and the third detector and is used for converting the first voltage value, the second voltage value and the third voltage value into digital signals and sending the digital signals to the controller;
the controller correspondingly carries out gain adjustment on the first variable gain module, the second variable gain module and the third variable gain module according to the first voltage value, the second voltage value and the third voltage value received by the multichannel analog-to-digital converter, so that the frequency hopping signal RF received by the antenna sequentially passes through the first variable gain module, the first intermediate frequency filter circuit, the second variable gain module, the second intermediate frequency filter circuit and the third variable gain module, and then a second intermediate frequency signal IF2 with relatively stable amplitude is obtained and input into the controller.
Preferably, the mixer further comprises a first mixer and a first local vibration source; the first mixer is arranged between the first variable gain module and the first intermediate frequency filter, and the first local vibration source is electrically connected with the first mixer.
Preferably, the second mixer and the second local vibration source are further included; the second mixer is arranged between the second variable gain module and the second intermediate frequency filter, and the second local vibration source is electrically connected with the second mixer.
Preferably, the high-speed analog-to-digital converter is further included, and the high-speed analog-to-digital converter is arranged between the third variable gain module and the controller;
the second intermediate frequency signal IF2 is input into the controller through a high-speed analog-to-digital converter.
When the receiver works, the signal output received by the antenna sequentially passes through the variable frequency band-pass filter, the first variable gain module, the first intermediate frequency filter, the second variable gain module, the second intermediate frequency filter and the third variable gain module, the controller receives the first voltage value, the second voltage value and the third voltage value according to the multichannel analog-to-digital converter, and according to the gain automatic control method, the gain adjustment is correspondingly carried out on the first variable gain module, the second variable gain module and the third variable gain module, so that the frequency hopping signal RF received by the antenna is processed by the first variable gain module, the second variable gain module and the third variable gain module, and then a second intermediate frequency signal IF2 with relatively stable amplitude is obtained.
A method for automatically controlling gain of a frequency hopping receiver, said method comprising the steps of:
based on the frequency hopping receiver, a distributed control method is adopted to distribute the task of signal gain adjustment to a first variable gain module, a second variable gain module and a third variable gain module;
after the frequency hopping receiving signal enters the receiving circuit, the step-by-step measurement adjustment is carried out on the receiving signal according to the signal processing flow and the time sequence of the first variable gain module, the second variable gain module and the third variable gain module;
after triggering and starting a gain adjustment flow, the controller independently completes gain adjustment of the variable gain module of the stage according to a frequency hopping synchronous search state, a frequency hopping synchronous working state and an adjacent channel interference state and a signal power voltage and gain gear relation table preset by the stage, and ensures that the gain gear of the circuit of the stage is adapted to the current signal power intensity;
the condition for triggering the start of the gain adjustment process is that there is a frequency-shifted pulse signal and a strong signal indication.
Preferably, the gain adjustment iteration time is reduced by adopting a control mode of combining thickness and fineness, and specifically:
the gains of the first variable gain module and the second variable gain module are divided into 2-3 gears, and coarse adjustment is performed in a large stepping mode;
the gain of the third variable gain module is divided into n small stepping gears, and fine adjustment is realized in a small stepping mode, wherein n is an integer greater than 10.
The step-by-step measurement and adjustment of the frequency hopping receiving signal are carried out according to the signal processing flow and the time sequence, and the method specifically comprises the following three steps of operations:
the first step: reading a first voltage value, a second voltage value and a third voltage value of each detector at the time T0, and judging whether the current adjacent channel interference state exists or not by means of state combination characteristics of the voltage values:
if the judgment result is yes, setting the gain requirement according to the adjacent channel interference state, and stopping the following second and third steps;
if not, the gear value of the first variable gain module is set by looking up a table according to a preset gear value relation table of the first voltage value and the first variable gain module, and the second step and the third step of operation are continuously executed;
and a second step of: reading a second voltage value of the second detector at the time T1, and looking up a table to set a gear value of the second variable gain module according to a preset gear value relation table of the second voltage value and the second variable gain module;
and a third step of: and reading a third voltage value of the third detector at the time T2, and looking up a table to set the gear value of the third variable gain module according to a preset gear value relation table of the third voltage value and the third variable gain module.
Further, the frequency hopping synchronous searching state refers to a working state that the real-time working frequency of the frequency hopping receiver is not consistent with the transmitting end and is in a state of waiting to receive frequency hopping synchronous information according to synchronous hopping;
when the signal is in the state, the controller presets the front end of the receiver as the maximum gain, continuously reads a third voltage value of a third detector according to a fixed time interval, judges that the signal is a strong signal at present when the third voltage value is greater than a certain preset reference value, and triggers a primary gain adjustment flow; otherwise, judging the signal to be a small signal, wherein the frequency hopping receiver keeps the maximum gain; wherein the time interval is less than the frequency hopping period.
Further, the frequency hopping synchronous working state is that after the frequency hopping receiver completes frequency hopping synchronization, the working frequency of the frequency hopping synchronous working state is consistent with that of a transmitting end, and the frequency hopping synchronous working state is synchronously hopped along with time variation;
when the frequency-changing pulse signal is in the state, triggering and starting a gain adjustment flow by the frequency-changing pulse signal, wherein each frequency-hopping carrier signal received by the frequency-hopping receiver is subjected to gain adjustment once, and the adjustment time is limited in a non-useful data period at the beginning end of each frequency-hopping carrier period;
further, the adjacent channel interference state refers to that a strong interference signal exists on an adjacent frequency of the current working frequency of the receiver, and the state is identified by the combined characteristic of the first voltage value, the second voltage value and the third voltage value, and is specifically characterized in that: the first voltage value and the second voltage value are larger than a certain voltage reference value, and the third voltage value is equal to or close to the voltage reference value when no signal exists;
when the frequency hopping receiver is in the state, all gain gears of the first variable gain module, the second variable gain module and the third variable gain module of the frequency hopping receiver are set to be maximum gain gears.
The beneficial effects of the invention are as follows:
the invention is different from the automatic gain control method of other frequency hopping receivers, and the automatic gain control method is used for carrying out step-by-step measurement adjustment according to the signal processing flow and the time sequence, and has the advantages of simple and flexible control method, configurable precision, dynamic range and response time and strong applicability. Meanwhile, various working states of the frequency hopping receiver are fully considered, the gain control method is distinguished, the problem of receiving performance degradation caused by frequency fading and far-near effect is effectively solved, and a practical, effective and reliable solution is provided for automatic gain control of the frequency hopping receiver.
Drawings
Fig. 1 is a schematic circuit diagram of a frequency hopping receiver according to the present invention.
Fig. 2 is a flowchart of the gain adjustment procedure according to the present invention.
Fig. 3 is a time domain diagram of the output signal of the second intermediate frequency IF2 of the example of the invention.
Detailed Description
The invention is described in detail below with reference to the drawings and the detailed description.
Example 1
As shown in fig. 1, a frequency hopping receiver includes a first detector, a second detector, a third detector, a first variable gain module, a second variable gain module, a third variable gain module, a multi-channel analog-to-digital converter, a controller, a frequency conversion band-pass filter, a first intermediate frequency filter, and a second intermediate frequency filter.
The variable frequency band-pass filter, the first variable gain module, the first intermediate frequency filter, the second variable gain module, the second intermediate frequency filter, the third variable gain module and the controller are electrically connected in sequence.
The first detector is used for detecting the signal power intensity of the input end of the first variable gain module, the sampling detection point is arranged between the variable frequency band-pass filter and the first variable gain module, and the first detector converts the signal power intensity of the input end of the first variable gain module into a voltage value which is called a first voltage value.
The second detector is used for detecting the signal power intensity of the input end of the second variable gain module, the sampling detection point is arranged between the first intermediate frequency filter and the second variable gain module, and the second detector converts the signal power intensity of the input end of the second variable gain module into a voltage value which is called a second voltage value.
The third detector is used for detecting the signal power intensity of the input end of the third variable gain module, the sampling detection point is arranged between the second intermediate frequency filter and the third variable gain module, and the third detector converts the signal power intensity of the input end of the third variable gain module into a voltage value which is called a third voltage value.
The first variable gain module is used for amplifying or attenuating radio frequency signals, and the gain is controlled by the controller.
The second variable gain module is used for amplifying or attenuating the first intermediate frequency signal, and the gain is controlled by the controller.
The third variable gain module is used for amplifying or attenuating the second intermediate frequency signal, and the gain is controlled by the controller.
The multichannel analog-to-digital converter is arranged between the first detector, the second detector and the third detector and is used for converting the first voltage value, the second voltage value and the third voltage value into digital signals and sending the digital signals to the controller;
the controller correspondingly carries out gain adjustment on the first variable gain module, the second variable gain module and the third variable gain module according to the first voltage value, the second voltage value and the third voltage value received by the multichannel analog-to-digital converter, so that the frequency hopping signal RF received by the antenna sequentially passes through the first variable gain module, the first intermediate frequency filter circuit, the second variable gain module, the second intermediate frequency filter circuit and the third variable gain module, and then an intermediate frequency signal IF input controller with relatively stable amplitude is obtained.
The variable frequency band-pass filter is connected between the antenna port and the first variable gain module and is used for filtering interference clutter signals of the RF far end of the frequency hopping signal, and in the embodiment, the variable frequency band-pass filter is preferably a numerical control type bipolar point tuning band-pass filter, so that higher variable frequency speed and stop band suppression can be obtained.
The first variable gain module is used for amplifying or attenuating radio frequency signals, the gain is controlled by the controller, the variable gain module is located at a first stage amplifier of the receiver, in this embodiment, the first variable gain module is designed by adopting a low noise type amplifier, so that the receiver obtains a lower noise coefficient, and the gain is set to be-10 dB and +20dB.
The second variable gain module is used for amplifying or attenuating the first intermediate frequency signal, the gain is controlled by the controller, and the gain is set to be-10 dB and +20dB.
The third variable gain module is used for amplifying or attenuating the second intermediate frequency signal, the gain is controlled by the controller, the gain of the embodiment is set to be-20 dB to +30dB, the gain is averagely divided into 25 gears (n=25), each step is 2dB, and in principle, the larger n is, the higher the fine adjustment precision is.
In this embodiment, the signal input power range of the receiver is divided into three sections, such as: +10dBm (upper limit) to-20 dBm, -21dBm to-60 dBm, -61dBm to-100 dBm (lower limit), three detectors distributed at different positions of a receiver channel are detected by a division relay mode.
The sampling detection point of the first detector is arranged between the variable frequency band-pass filter and the first variable gain module, and the signal range responsible for detection is as follows: +20dBm (upper limit) to-20 dBm.
The sampling detection point of the second detector is arranged between the first intermediate frequency filter and the second variable gain module, and the signal range responsible for detection is as follows: -21dBm to-60 dBm.
The sampling detection point of the third detector is arranged between the second intermediate frequency filter and the third variable gain module, and the signal range responsible for detection is as follows: -61dBm to-100 dBm (lower limit).
Example 2
As shown in fig. 1, a frequency hopping receiver circuit includes a frequency conversion band-pass filter, a first variable gain module, a second variable gain module, a third variable gain module, a first mixer, a second mixer, a first intermediate frequency filter, a second intermediate frequency filter, a first local vibration source, a second local vibration source, a first detector, a second detector, a third detector, a multichannel analog-to-digital converter, a high-speed analog-to-digital converter, and a controller.
The variable frequency band-pass filter, the first variable gain module, the first mixer, the first intermediate frequency filter, the second variable gain module, the second mixer, the second intermediate frequency filter, the third variable gain module, the high-speed analog-to-digital converter and the controller are electrically connected in sequence.
The first mixer is arranged between the first variable gain module and the first intermediate frequency filter, and the first local vibration source is electrically connected with the first mixer.
The second mixer is arranged between the second variable gain module and the second intermediate frequency filter, and the second local vibration source is electrically connected with the second mixer.
The high-speed analog-to-digital converter is arranged between the third variable gain module and the controller;
the intermediate frequency signal IF is input into the controller through a high-speed analog-to-digital converter.
The variable frequency band-pass filter is connected between the antenna port and the first variable gain module and is used for filtering interference clutter signals of the RF far end of the frequency hopping signal, and in the embodiment, the variable frequency band-pass filter is preferably a numerical control type bipolar point tuning band-pass filter, so that higher variable frequency speed and stop band suppression can be obtained.
The first variable gain module is arranged between the variable frequency band-pass filter and the first mixer and is used for amplifying or attenuating radio frequency signals, the gain is controlled by the controller, the variable gain module is positioned at a first stage amplifier of the receiver, in the embodiment, the first variable gain module adopts a low noise type amplifier to design, so that the receiver obtains a lower noise coefficient, and the gain is set to be-10 dB and +20dB.
The second variable gain module is arranged between the first intermediate frequency filter and the second mixer and is used for amplifying or attenuating the first intermediate frequency signal, the gain is controlled by the controller, and the gain is set to be-10 dB and +20dB.
The third variable gain module is arranged between the second intermediate frequency filter and the high-speed analog-to-digital converter and is used for amplifying or attenuating the second intermediate frequency signal, the gain is controlled by the controller, the gain of the embodiment is set to be-20 dB to +30dB, the gain is averagely divided into 25 gears (n=25), each step is 2dB, and in principle, the larger n is, the higher the fine adjustment precision is.
The first mixer is connected between the first variable gain module and the first intermediate frequency filter and is used for moving the frequency of the frequency hopping signal RF to a first intermediate frequency IF1, and IF the first local oscillation source provides a fast hopping local oscillation frequency Lo1 for the first local oscillation source, the first local oscillation source is IF1=RF + -Lo 1.
The second mixer is connected between the second variable gain module and the second intermediate frequency filter, and is configured to shift the frequency of the first intermediate frequency IF1 to the second intermediate frequency IF2, and the second local oscillation source provides a local oscillation signal Lo2 with a fixed frequency for the second local oscillation source, so that IF 2=if1±lo2.
The first local vibration source is a high-speed variable-frequency type frequency synthesizer, and the second local vibration source is a fixed-frequency type frequency source.
The first intermediate frequency filter is connected between the first mixer and the second variable gain module and is used for filtering interference clutter signals outside the first intermediate frequency IF1 passband.
The second intermediate frequency filter is connected between the second mixer and the third variable gain module and is used for filtering interference clutter signals outside the second intermediate frequency IF2 passband.
In this embodiment, the signal input power range of the receiver is divided into three sections, such as: +10dBm (upper limit) to-20 dBm, -21dBm to-60 dBm, -61dBm to-100 dBm (lower limit), three detectors distributed at different positions of a receiver channel are detected by a division relay mode.
The sampling detection point of the first detector is arranged between the variable frequency band-pass filter and the first variable gain module, and the signal range responsible for detection is as follows: +20dBm (upper limit) to-20 dBm.
The sampling detection point of the second detector is arranged between the first intermediate frequency filter and the second variable gain module, and the signal range responsible for detection is as follows: -21dBm to-60 dBm.
The sampling detection point of the third detector is arranged between the second intermediate frequency filter and the third variable gain module, and the signal range responsible for detection is as follows: -61dBm to-100 dBm (lower limit).
The multichannel analog-to-digital converter is arranged between the first detector, the second detector and the third detector and is used for converting the first voltage value, the second voltage value and the third voltage value into digital signals to be input into the controller, and in the implementation, the accuracy and the conversion speed of the analog-to-digital converter are mainly considered, so that the related index requirements of the circuit are required to be met.
The high-speed analog-to-digital converter is arranged between the third variable gain module and the controller and is used for converting the analog second intermediate frequency signal IF2 into a digital signal, the digital signal is sent to the baseband processing unit through the controller, and the conversion rate is usually not lower than 100MSPS, in this embodiment, the high-speed analog-to-digital converter is AD9254 of ADI company.
The controller is a control center of a front-end circuit of the receiver, is responsible for controlling the working state, parameter configuration and gain of each module circuit, is connected with the baseband processing unit through the communication interface and receives control instructions, and is preferably an FPGA.
Example 3
A method for automatically controlling gain of a frequency hopping receiver, said method comprising the steps of:
based on the frequency hopping receiver described in embodiment 1 or embodiment 2, a distributed control method is adopted to distribute tasks of signal gain adjustment to the first variable gain module, the second variable gain module, and the third variable gain module;
reducing the gain adjustment iteration time by adopting a control mode of combining thickness and fineness, and quickly approaching to a target value;
after the frequency hopping receiving signal enters the receiving circuit, step-by-step measurement adjustment is carried out on the receiving signal according to the signal processing flow and time sequence of the first variable gain module, the second variable gain module and the third variable gain module;
after triggering and starting the gain adjustment flow, the controller independently completes the gain adjustment of the variable gain module of the stage according to the preset signal power voltage and gain gear relation table of the stage and according to the frequency hopping synchronous search state, the frequency hopping synchronous working state and the adjacent channel interference state, and ensures that the gain gear of the circuit of the stage is adapted to the current signal power intensity.
The condition for triggering the start of the gain adjustment process is that there is a frequency-shifted pulse signal and a strong signal indication.
Preferably, the gain adjustment iteration time is reduced by adopting a control mode of combining thickness and fineness, and specifically:
the gains of the first variable gain module and the second variable gain module are divided into 2-3 gears, and coarse adjustment is performed in a large stepping mode;
the gain of the third variable gain module is divided into n small stepping gears, and fine adjustment is realized in a small stepping mode, wherein n is an integer greater than 10.
The step-by-step measurement and adjustment of the frequency hopping receiving signal are carried out according to the signal processing flow and the time sequence, and the method specifically comprises the following three steps of operations:
the first step: reading a first voltage value, a second voltage value and a third voltage value of each detector at the time T0, and judging whether the current adjacent channel interference state exists or not by means of state combination characteristics of the voltage values:
if the judgment result is yes, setting the gain requirement according to the adjacent channel interference state, and stopping the following second and third steps;
if not, the gear value of the first variable gain module is set by looking up a table according to the read first voltage value and a preset gear relation table of the first voltage value and the first variable gain module, and the second and third steps of operations are continuously executed;
and a second step of: reading a second voltage value of the second detector at the time T1, and looking up a table to set a gear value of the second variable gain module according to a preset gear value relation table of the second voltage value and the second variable gain module;
and a third step of: and reading a third voltage value of the third detector at the time T2, and looking up a table to set the gear value of the third variable gain module according to a preset gear value relation table of the third voltage value and the third variable gain module.
In a specific embodiment, the input signal power of the receiver is inversely proportional to the gain values of the first, second and third variable gain modules, and table 1 shows the gain control relationship of the embodiment:
table 1 receive gain control relationship table
Note that: 1. a1, A2 and A3 in the table respectively represent a first variable gain module, a second variable gain module and a third variable gain module;
2. the IF2 output intermediate frequency amplitude is equal to the algebraic sum of RF, A1, A2, A3.
The conditions for triggering and starting the gain adjustment flow are respectively provided with a frequency conversion pulse signal and a strong signal indication, and the state indication signal of the frequency hopping synchronous search and the frequency hopping synchronous work comes from a control instruction of the baseband processing unit.
Further, the frequency hopping synchronous searching state refers to a working state that the real-time working frequency of the frequency hopping receiver is not consistent with the transmitting end and is in a state of waiting to receive frequency hopping synchronous information according to synchronous hopping;
when the signal is in the state, the controller firstly presets the front end of the receiver as the maximum gain, then continuously reads a third voltage value of a third detector according to a fixed time interval, and when the third voltage value is larger than a certain preset reference value, judges that the signal is a strong signal at present, and the strong signal indicates to be effective, and triggers a gain adjustment flow once; otherwise, judging the signal to be a small signal, wherein the frequency hopping receiver keeps the maximum gain; wherein the time interval is less than the frequency hopping period; the method aims to solve the problem of gain control of the frequency hopping receiver before synchronization in a near-field large-signal environment, and avoid the situation that frequency hopping synchronization information cannot be received due to large signal blocking;
further, the frequency hopping synchronous working state is that after the frequency hopping receiver completes frequency hopping synchronization, the working frequency of the frequency hopping synchronous working state is consistent with that of a transmitting end, and the frequency hopping synchronous working state is synchronously hopped along with time variation;
when the frequency-changing pulse signal is in the state, the frequency-changing pulse signal triggers and starts a gain adjustment flow, each frequency-hopping signal received by the frequency-hopping receiver is subjected to gain adjustment once, the adjustment time is limited in the period of non-useful data at the beginning end of each frequency-hopping carrier period, namely, the gain adjustment operation is required to be completed before the useful data is transmitted in each frequency-hopping period, and the data loss caused by the operation during the period of transmitting the useful data is avoided;
further, the adjacent channel interference state refers to that a strong interference signal exists on an adjacent frequency of the current working frequency of the receiver, and the state is identified by the combined characteristic of the first voltage value, the second voltage value and the third voltage value, and is specifically characterized in that: the first voltage value and the second voltage value are larger than a certain voltage reference value, and the third voltage value is equal to or close to the voltage reference value when no signal exists;
in this state, the gain stages of the first, second and third variable gain modules of the frequency hopping receiver circuit are all set to the maximum gain stage.
It is to be understood that the above examples of the present invention are provided by way of illustration only and not by way of limitation of the embodiments of the present invention. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.
Claims (6)
1. A frequency hopping receiver, characterized by: the device comprises a first detector, a second detector, a third detector, a first variable gain module, a second variable gain module, a third variable gain module, a multichannel analog-to-digital converter, a controller, a variable frequency band-pass filter, a first intermediate frequency filter and a second intermediate frequency filter;
the variable frequency band-pass filter, the first variable gain module, the first intermediate frequency filter, the second variable gain module, the second intermediate frequency filter, the third variable gain module and the controller are electrically connected in sequence;
the first detector is used for detecting the signal power intensity of the input end of the first variable gain module, the sampling detection point is arranged between the variable frequency band-pass filter and the first variable gain module, and the first detector converts the signal power intensity of the input end of the first variable gain module into a voltage value which is called a first voltage value;
the second detector is used for detecting the signal power intensity of the input end of the second variable gain module, the sampling detection point is arranged between the first intermediate frequency filter and the second variable gain module, and the second detector converts the signal power intensity of the input end of the second variable gain module into a voltage value which is called a second voltage value;
the third detector is used for detecting the signal power intensity of the input end of the third variable gain module, the sampling detection point is arranged between the second intermediate frequency filter and the third variable gain module, and the third detector converts the signal power intensity of the input end of the third variable gain module into a voltage value which is called a third voltage value;
the first variable gain module is used for amplifying or attenuating radio frequency signals, and the gain is controlled by the controller;
the second variable gain module is used for amplifying or attenuating the first intermediate frequency signal, and the gain is controlled by the controller;
the third variable gain module is used for amplifying or attenuating the second intermediate frequency signal, and the gain is controlled by the controller;
the multichannel analog-to-digital converter is arranged between the first detector, the second detector and the third detector and is used for converting the first voltage value, the second voltage value and the third voltage value into digital signals and sending the digital signals to the controller;
the controller correspondingly carries out gain adjustment on the first variable gain module, the second variable gain module and the third variable gain module according to the first voltage value, the second voltage value and the third voltage value received by the multichannel analog-to-digital converter, so that a frequency hopping signal RF received by an antenna sequentially passes through the first variable gain module, the first intermediate frequency filter circuit, the second variable gain module, the second intermediate frequency filter circuit and the third variable gain module, and then a second intermediate frequency signal IF2 with relatively stable amplitude is obtained and input into the controller;
the frequency hopping receiver adopts a distributed control method, and distributes the task of signal gain adjustment to a first variable gain module, a second variable gain module and a third variable gain module;
after the received signal enters a front-end circuit of the receiver, the received signal is measured and adjusted step by step according to the signal processing flow and time sequence of the first variable gain module, the second variable gain module and the third variable gain module;
after triggering and starting a gain adjustment flow, the controller independently completes gain adjustment of the variable gain module of the stage according to a frequency hopping synchronous search state, a frequency hopping synchronous working state and an adjacent channel interference state and a signal power voltage and gain gear relation table preset by the stage, and ensures that the gain gear of the circuit of the stage is adapted to the current signal power intensity;
the condition for triggering and starting the gain adjustment flow is that a frequency conversion pulse signal and a strong signal indicate;
the step-by-step measurement and adjustment of the frequency hopping receiving signal are carried out according to the signal processing flow and the time sequence, and the method specifically comprises the following three steps of operations:
the first step: reading a first voltage value, a second voltage value and a third voltage value of each detector at the time T0, and judging whether the current adjacent channel interference state exists or not by means of state combination characteristics of the voltage values:
if the judgment result is yes, setting the gain requirement according to the adjacent channel interference state, and stopping the following second and third steps;
if not, the gear value of the first variable gain module is set by looking up a table according to a preset gear value relation table of the first voltage value and the first variable gain module, and the second step and the third step of operation are continuously executed;
and a second step of: reading a second voltage value of the second detector at the time T1, and looking up a table to set a gear value of the second variable gain module according to a preset gear value relation table of the second voltage value and the second variable gain module;
and a third step of: reading a third voltage value of a third detector at the time T2, and looking up a table to set a gear value of a third variable gain module according to a preset gear value relation table of the third voltage value and the third variable gain module;
the frequency hopping synchronous searching state refers to a working state that the real-time working frequency of the frequency hopping receiver is not consistent with the transmitting end and is in a state of waiting to receive frequency hopping synchronous information according to synchronous hopping;
when the signal is in the state, the controller presets the front end of the receiver as the maximum gain, continuously reads a third voltage value of a third detector according to a fixed time interval, and judges that the signal is a strong signal at present when the third voltage value is greater than a certain preset reference value, and the strong signal indicates that the effect is to trigger a primary gain adjustment flow; otherwise, judging the signal to be a small signal, wherein the frequency hopping receiver keeps the maximum gain; wherein the time interval is less than the frequency hopping period;
the frequency hopping synchronous working state means that after the frequency hopping receiver completes frequency hopping synchronization, the working frequency of the frequency hopping receiver keeps consistent with that of a transmitting end, and the frequency hopping receiver synchronously hops along with time variation;
when the frequency-changing pulse signal is in the state, triggering and starting a gain adjustment flow by the frequency-changing pulse signal, wherein each frequency-hopping carrier signal received by the frequency-hopping receiver is subjected to gain adjustment once, and the adjustment time is limited in a non-useful data period at the beginning end of each frequency-hopping carrier period;
the adjacent channel interference state refers to the existence of a strong interference signal on the adjacent frequency of the current working frequency of the receiver, and the state is identified by the combined characteristics of the first voltage value, the second voltage value and the third voltage value, and is specifically characterized in that: the first voltage value and the second voltage value are larger than a certain reference value, and the third voltage value is equal to or close to the voltage reference value when no signal exists;
when the frequency hopping receiver is in the state, all gain gears of the first variable gain module, the second variable gain module and the third variable gain module of the frequency hopping receiver are set to be maximum gain gears.
2. The frequency hopping receiver of claim 1, wherein: the system also comprises a first mixer and a first local vibration source; the first mixer is arranged between the first variable gain module and the first intermediate frequency filter, and the first local vibration source is electrically connected with the first mixer.
3. The frequency hopping receiver of claim 1, wherein: the second mixer and the second local vibration source are also included; the second mixer is arranged between the second variable gain module and the second intermediate frequency filter, and the second local vibration source is electrically connected with the second mixer.
4. The frequency hopping receiver of claim 1, wherein: the high-speed analog-to-digital converter is arranged between the third variable gain module and the controller;
the second intermediate frequency signal IF2 is input into the controller through a high-speed analog-to-digital converter.
5. An automatic gain control method for a frequency hopping receiver is characterized in that: the method comprises the following steps:
the frequency hopping receiver according to any one of claims 1 to 4, wherein the tasks of signal gain adjustment are distributed in a first variable gain module, a second variable gain module and a third variable gain module by adopting a distributed control method;
after the received signal enters a front-end circuit of the receiver, the received signal is measured and adjusted step by step according to the signal processing flow and time sequence of the first variable gain module, the second variable gain module and the third variable gain module;
after triggering and starting a gain adjustment flow, the controller independently completes gain adjustment of the variable gain module of the stage according to a frequency hopping synchronous search state, a frequency hopping synchronous working state and an adjacent channel interference state and a signal power voltage and gain gear relation table preset by the stage, and ensures that the gain gear of the circuit of the stage is adapted to the current signal power intensity;
the condition for triggering and starting the gain adjustment flow is that a frequency conversion pulse signal and a strong signal indicate;
the step-by-step measurement and adjustment of the frequency hopping receiving signal are carried out according to the signal processing flow and the time sequence, and the method specifically comprises the following three steps of operations:
the first step: reading a first voltage value, a second voltage value and a third voltage value of each detector at the time T0, and judging whether the current adjacent channel interference state exists or not by means of state combination characteristics of the voltage values:
if the judgment result is yes, setting the gain requirement according to the adjacent channel interference state, and stopping the following second and third steps;
if not, the gear value of the first variable gain module is set by looking up a table according to a preset gear value relation table of the first voltage value and the first variable gain module, and the second step and the third step of operation are continuously executed;
and a second step of: reading a second voltage value of the second detector at the time T1, and looking up a table to set a gear value of the second variable gain module according to a preset gear value relation table of the second voltage value and the second variable gain module;
and a third step of: reading a third voltage value of a third detector at the time T2, and looking up a table to set a gear value of a third variable gain module according to a preset gear value relation table of the third voltage value and the third variable gain module;
the frequency hopping synchronous searching state refers to a working state that the real-time working frequency of the frequency hopping receiver is not consistent with the transmitting end and is in a state of waiting to receive frequency hopping synchronous information according to synchronous hopping;
when the signal is in the state, the controller presets the front end of the receiver as the maximum gain, continuously reads a third voltage value of a third detector according to a fixed time interval, and judges that the signal is a strong signal at present when the third voltage value is greater than a certain preset reference value, and the strong signal indicates that the effect is to trigger a primary gain adjustment flow; otherwise, judging the signal to be a small signal, wherein the frequency hopping receiver keeps the maximum gain; wherein the time interval is less than the frequency hopping period;
the frequency hopping synchronous working state means that after the frequency hopping receiver completes frequency hopping synchronization, the working frequency of the frequency hopping receiver keeps consistent with that of a transmitting end, and the frequency hopping receiver synchronously hops along with time variation;
when the frequency-changing pulse signal is in the state, triggering and starting a gain adjustment flow by the frequency-changing pulse signal, wherein each frequency-hopping carrier signal received by the frequency-hopping receiver is subjected to gain adjustment once, and the adjustment time is limited in a non-useful data period at the beginning end of each frequency-hopping carrier period;
the adjacent channel interference state refers to the existence of a strong interference signal on the adjacent frequency of the current working frequency of the receiver, and the state is identified by the combined characteristics of the first voltage value, the second voltage value and the third voltage value, and is specifically characterized in that: the first voltage value and the second voltage value are larger than a certain reference value, and the third voltage value is equal to or close to the voltage reference value when no signal exists;
when the frequency hopping receiver is in the state, all gain gears of the first variable gain module, the second variable gain module and the third variable gain module of the frequency hopping receiver are set to be maximum gain gears.
6. The automatic gain control method of a frequency hopping receiver according to claim 5, wherein: the gain adjustment iteration time is reduced by adopting a control mode of combining thickness and fineness, and specifically:
the gains of the first variable gain module and the second variable gain module are divided into 2-3 gears, and coarse adjustment is performed in a large stepping mode;
the gain of the third variable gain module is divided into n small stepping gears, fine adjustment is performed in a small stepping mode, n is an integer larger than 10, and the larger the value of n is, the higher the control accuracy of the output amplitude of the second intermediate frequency signal IF2 is.
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| JP2012191266A (en) * | 2011-03-08 | 2012-10-04 | Casio Comput Co Ltd | Receiver and program |
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| JP3080156B2 (en) * | 1997-12-24 | 2000-08-21 | 日本電気株式会社 | Automatic Gain Control Method for Frequency Hopping Communication Receiver |
| JP2001024619A (en) * | 1999-07-05 | 2001-01-26 | Matsushita Electric Ind Co Ltd | Ofdm signal receiver |
| US7830991B2 (en) * | 2005-10-03 | 2010-11-09 | Harris Corporation | Frequency selective automatic gain control with dual non-symmetric attack and release times and interference detection feature |
| CN103888169A (en) * | 2014-02-21 | 2014-06-25 | 中国人民解放军总参谋部第六十三研究所 | Gain control method for ultra short wave reception channel |
| CN112564726B (en) * | 2020-11-25 | 2022-10-28 | 电子科技大学 | Receiver broadband large dynamic automatic gain control circuit |
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| JP2012191266A (en) * | 2011-03-08 | 2012-10-04 | Casio Comput Co Ltd | Receiver and program |
| CN107645283A (en) * | 2016-07-19 | 2018-01-30 | 炬芯（珠海）科技有限公司 | A kind of auto gain control method and device |
| CN110830079A (en) * | 2019-11-29 | 2020-02-21 | 小唐科技（上海）有限公司 | Frequency hopping gain control device and control method |
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