CN115801149B - Receiver pre-selector calibration method, system, electronic equipment and storage medium - Google Patents
Receiver pre-selector calibration method, system, electronic equipment and storage medium Download PDFInfo
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- CN115801149B CN115801149B CN202310101072.4A CN202310101072A CN115801149B CN 115801149 B CN115801149 B CN 115801149B CN 202310101072 A CN202310101072 A CN 202310101072A CN 115801149 B CN115801149 B CN 115801149B
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Abstract
The invention provides a calibration method, a system, electronic equipment and a storage medium for a receiver preselector, which relate to the field of signal receiving and analysis, and the method comprises the following steps: setting a local oscillation frequency point corresponding to a calibration frequency point of a preselector, bypassing the preselector by a receiver, and detecting a power value P in the bandwidth of an intermediate-frequency signal; the preselector is accessed, an initial digital-to-analog conversion value D is set, a stepping value is configured, the intermediate frequency receiver detects a power value P1 in the current bandwidth, and a power difference is calculated: PY1= P-P1, the digital-to-analog conversion value configures a preselector according to a stepping value, calculates a difference value PY (I) = P-PI detected by the intermediate frequency receiver, and judges the monotonicity of PY (I) and PY (I-1); if not monotonically increasing, the preselector and calculations continue to be configured in steps until PYI and PY (I-1) are monotonically increasing, recording PY (I-1) as the preselector calibration frequency. The invention has the advantages of low calibration cost and complexity of the preselector, wide real-time frequency correction range and high efficiency.
Description
Technical Field
The invention belongs to the technical field of signal receiving and analysis, and particularly relates to a receiver preselector calibration method, a receiver preselector calibration system, electronic equipment and a storage medium.
Background
The receiver technology is widely applied in the field of microwave electronic measurement, and a signal analyzer is the most commonly used microwave measuring instrument. The superheterodyne scheme is a classic common receiver architecture scheme of a signal analysis instrument and has the outstanding advantages of large dynamic range, good frequency selectivity, low receiving sensitivity and the like. Fig. 1 is a schematic block diagram of a front end of a superheterodyne receiver, in which a radio frequency signal is attenuated, amplified, filtered, and then mixed with a local oscillator signal to generate an intermediate frequency signal, a mixing stage is generally 2-4 stages, each stage is subjected to amplification and filtering after mixing, and the final stage of intermediate frequency signal is generated for signal analysis and processing.
Although the superheterodyne front-end receiving scheme has outstanding advantages, the mixer has the defects of image frequency interference, in-band multiple response, out-of-band multiple response and the like due to limited isolation. In the low frequency band, a low-pass filter can be used for suppressing image frequency interference; in the high band, the harmonic component is abundant, the harmonic mixing situation is complex, and a tracking preselector is required to be used for suppressing image frequency interference and multiple responses.
Most tracking preselectors use a tunable filter (YTF) using YIG (Yttrium Iron Garnet, a ferrimagnetic material). The YTF has the working principle that the self-resonant frequency of the YIG ball is controlled by the magnetic field generated by the driving current, and tunable filtering can be realized in a wide frequency range of a high-frequency band. The YTF has the advantages of wide frequency range, low insertion loss, high Q selectivity and the like, but the open-loop YTF needs to be synchronously tuned with a first local oscillator when in use, the frequency center of the YTF needs to be calibrated, and the calibrated YTF also has the defects of temperature drift, tuning nonlinearity and the like so as to influence the measurement uncertainty and the accuracy of a signal analysis instrument. The calibration of the broadband pre-selector YTF is a key technical difficulty.
There are three methods of calibrating a broadband preselector currently in use: the first method, using an external broadband signal source as a calibration reference signal to perform frequency calibration on the preselector YTF; in the second method, the frequency calibration of the preselector YTF is performed using a comb generator (which may be built-in) as a calibration reference signal; the third method comprises the following steps: the frequency calibration of the pre-selector YTF is performed using a broadband noise source (which may be built-in) as a calibration reference signal.
The first scheme is realized by sending out a calibration signal through an external broadband signal source, tuning the current of the pre-selector YTF, and measuring a signal with a corresponding frequency to realize calibration, and FIG. 2 is a block diagram of the external broadband signal source calibration realization. In the implementation of the second scheme, the calibration of the preselector YTF is implemented by using a wideband comb spectrum generated by a comb generator as a calibration signal, wherein the comb generator may be externally connected or internally installed, and fig. 3 is a block diagram for implementing the calibration of the comb generator. In the third implementation scheme, the calibration of the preselector YTF is implemented by using the broadband noise generated by the broadband noise source as a calibration signal, the broadband noise source may be externally connected or internally installed as in the second implementation scheme, and fig. 4 is a block diagram for implementing the calibration of the broadband noise source.
The main disadvantages of the first approach are the need for expensive broadband signal sources, high cost and the lack of support for real-time calibration. The second method has the main disadvantages that the power of an excitation source signal of the comb wave generator is large, the output frequency spectrum is the frequency interval with the excitation signal as the minimum, the flatness of the output power of the full frequency band is large, the shielding of a receiver needs to be done, the receiver needs to have a large dynamic range, the frequency calibration of any point cannot be realized, if the real-time calibration is needed, the comb wave generator needs to be arranged in the comb wave generator, and the cost, the volume and the complexity of the receiver are increased. The main disadvantages of the third method are that the broadband noise source needs to be calibrated, the calibration instrument is expensive, the calibration method has high requirements on environment and equipment, and like the second method, if real-time calibration needs to be supported, the broadband noise source needs to be built in, and the cost and the complexity of the receiver are greatly improved.
Disclosure of Invention
In order to solve the technical problem, the invention provides a technical scheme for calibrating a pre-selector of a receiver.
The invention discloses a receiver preselector calibration method in a first aspect; the method comprises the following steps:
s1, setting a current calibration frequency point of a preselector;
s2, setting a first local oscillation frequency point corresponding to a calibration frequency point of a preselector, connecting a bypass of the preselector at the input end of a first frequency mixer under the condition that a receiver is not connected to the preselector, and detecting a power value P in a bandwidth of a first intermediate-frequency signal by an intermediate-frequency receiver connected to the output end of the first intermediate-frequency signal;
s3, accessing the preselector, setting an initial digital-to-analog conversion value D of the preselector, and configuring a digital-to-analog conversion step value
Setting i =1,i denotes the argument of the setting;
s4, detecting the power value P in the current bandwidth by the intermediate frequency receiver i Calculating the power difference value between the power P detected by the non-access preselector:
，
step S5, converting the step value according to the digital-to-analog
Step configuration is carried out on the power related value of the pre-selector once, i = i +1 is set, the power value Pi in the current bandwidth of the intermediate frequency receiver is detected, and the power difference value is calculated: />
；
Step S6, judgment
And/or>
Monotonicity between; if->
And/or>
Monotonically increases in between, it jumps to step S8, if ∑ is ∑ or ∑ is present>
And/or>
If the interval is not monotone increasing, jumping to the step S7;
s7, repeating the step S5 and the step S6 in sequence;
step S8, recording and
and the corresponding frequency of the preselector is used as the calibration frequency corresponding to the preselector, so that the calibration of the current frequency point is completed.
According to the method of the first aspect of the invention, the calibration frequency step value of the pre-selector is set
And step-by-step configuration is carried out on the calibration frequency points of the preselector, and all the calibration frequency points are calibrated according to the steps from S1 to S8.
According to the method of the first aspect of the invention, the power-related value is a current value.
According to the method of the first aspect of the present invention, a processor, a digital-to-analog conversion circuit and a voltage-to-current conversion circuit are connected between the intermediate frequency receiver and the pre-selector:
the processor analyzes and processes the intermediate frequency signal power of the intermediate frequency receiver, configures a digital-to-analog conversion value according to the processing result and completes digital-to-analog conversion in the digital-to-analog conversion circuit, the digital-to-analog conversion circuit inputs the converted analog signal into the voltage-current conversion circuit, and the voltage-current conversion circuit converts the voltage into the current to complete the control of the input current of the preselector.
According to the method of the first aspect of the invention, the attenuation value of the adjustable attenuator at the radio frequency input end is set to be greater than 40dB, and the output end of the adjustable attenuator is connected with a preset low noise amplifier.
According to the method of the first aspect of the invention, a first radio frequency switch is connected between the input of the pre-selector and the pre-set low noise amplifier, a second radio frequency switch is connected between the output of the pre-selector and the first mixer, and both the first radio frequency switch and the second radio frequency switch are bidirectional switches.
According to the method of the first aspect of the invention, the pre-selector selects the yttrium iron garnet tunable filter YTF.
The second aspect of the invention discloses a receiver preselector calibration system; the system comprises:
a first processing module configured to set a preselector current calibration frequency point;
the second processing module is configured to set a first local oscillation frequency point corresponding to a calibration frequency point of the preselector, connect a bypass of the preselector at the input end of the first mixer under the condition that the receiver is not connected to the preselector, and detect a power value P in a bandwidth of the first intermediate-frequency signal at an intermediate-frequency receiver connected to the output end of the first intermediate-frequency signal;
a third processing module configured to switch in the preselector, set an initial digital-to-analog conversion value D of the preselector, and configure a digital-to-analog conversion step value
Setting i =1,i denotes the argument of the setting;
a fourth processing module configured to detect the current in-bandwidth power value P by the IF receiver i Calculating the power difference value between the power P detected by the non-access preselector:
；
a fifth processing module configured to step values by digital-to-analog conversion
Step configuration is carried out once on the power related value of the pre-selector, i = i +1 is set, and the power value P in the current bandwidth of the intermediate frequency receiver is detected i Calculating a power difference value:
；
a sixth processing module configured to determine
And/or>
Monotonicity between; if->
And/or>
Monotonically increases in between, jumps to the eighth processing module if->
And/or>
If the difference is not monotone increasing, jumping to a seventh processing module;
a seventh processing module configured to repeat the fifth processing module and the sixth processing module in sequence;
an eighth processing module configured to record and process
And the corresponding frequency of the preselector is used as the calibration frequency corresponding to the preselector, so that the calibration of the current frequency point is completed.
According to the system of the second aspect of the present invention, a ninth processing module is provided:
setting a calibration frequency step value of the preselector, performing step configuration on calibration frequency points of the preselector, and calibrating all the calibration frequency points through the first to eighth processing modules.
According to the system of the second aspect of the invention, the power-related value is a current value.
According to the system of the second aspect of the present invention, a processor, a digital-to-analog conversion circuit and a voltage-to-current conversion circuit are connected between the intermediate frequency receiver and the pre-selector:
the processor analyzes and processes the intermediate frequency signal power of the intermediate frequency receiver, configures a digital-to-analog conversion value according to the processing result and completes digital-to-analog conversion in the digital-to-analog conversion circuit, the digital-to-analog conversion circuit inputs the converted analog signal into the voltage-current conversion circuit, and the voltage-current conversion circuit converts the voltage into the current to complete the control of the input current of the preselector.
According to the system of the second aspect of the invention, the attenuation value of the adjustable attenuator at the radio frequency input end is set to be more than 40dB, and the output end of the adjustable attenuator is connected with a preset low noise amplifier.
According to the system of the second aspect of the present invention, a first rf switch is connected between the input terminal of the pre-selector and the preset low noise amplifier, and a second rf switch is connected between the output terminal of the pre-selector and the first mixer, and both the first rf switch and the second rf switch are bidirectional switches.
According to the system of the second aspect of the invention, the pre-selector is selected from an yttrium iron garnet tunable filter YTF.
A third aspect of the invention discloses an electronic device. The electronic device comprises a memory storing a computer program and a processor implementing the steps of a method of calibrating a receiver pre-selector according to any one of the first aspect of the disclosure when the computer program is executed by the processor.
A fourth aspect of the invention discloses a computer-readable storage medium. The computer readable storage medium has stored thereon a computer program which, when executed by a processor, performs the steps of a method of calibrating a receiver pre-selector of any one of the first aspects of the disclosure.
In summary, the scheme provided by the invention has the following technical effects: by calculating the difference between the conditions of not accessing the preselector and accessing the preselector in the receiver, and by stepping the value according to the D/A conversion in the condition of accessing the preselector
Configuring different powers of a pre-selector, and detecting by an intermediate frequency receiver to obtain a plurality of power values in bandwidth->
Therefore, the difference values of the power values P in the bandwidth which are not accessed to the preselector can be obtained, the calibration frequency result of the preselector of the receiver is judged according to the monotone increasing characteristic of the difference values, the use of expensive broadband signal sources, comb wave generators and broadband noise sources is omitted, the cost is saved, meanwhile, the scheme can realize real-time calibration of different frequency points, the calibration range is wide, and the digital-to-analog conversion step value (H/M) is used for determining the calibration frequency value of the preselector of the receiver, so that the real-time calibration of the receiver can be realized, and the calibration frequency value is greater than or equal to the real-time calibration frequency value>
The method for measuring the difference value by configuring different powers of the preselector simplifies the calibration structure and reduces the calibration complexity, and the preselector calibration efficiency is greatly improved by adopting the method of analyzing and processing and controlling the intermediate frequency signal power of the intermediate frequency receiver by the processor.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic block diagram of a superheterodyne receiver front-end scheme according to the prior art;
FIG. 2 is a block diagram of an external broadband signal source calibration implementation according to the prior art;
FIG. 3 is a block diagram of a comb generator calibration implementation according to the prior art;
FIG. 4 is a block diagram of a broadband noise source calibration implementation according to the prior art;
FIG. 5 is a flow chart of a method of calibrating a receiver pre-selector in accordance with an embodiment of the present invention;
FIG. 6 is a block diagram of a receiver pre-selector calibration system according to an embodiment of the present invention;
FIG. 7 is a block diagram of a receiver pre-selector calibration circuit according to an embodiment of the present invention;
fig. 8 is a block diagram of an electronic device 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 technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
The invention discloses a receiver preselector calibration method in a first aspect. Fig. 5 is a flow chart of a method for receiver preselector calibration in accordance with an embodiment of the present invention, the method comprising, as shown in fig. 5:
s0, setting an adjustable attenuation value to be A, and opening pre-discharge;
s1, setting a current calibration frequency point of a preselector;
s2, setting a first local oscillation frequency point corresponding to a calibration frequency point of a preselector, connecting a bypass of the preselector at the input end of a first frequency mixer under the condition that a receiver is not connected to the preselector, and detecting a power value P in a bandwidth of a first intermediate-frequency signal by an intermediate-frequency receiver connected to the output end of the first intermediate-frequency signal;
s3, switching in the preselector and setting preselectionInitial D/A conversion value D of the device, and step value of D/A conversion configuration
Setting i =1,i denotes the argument of the setting;
s4, detecting the power value P in the current bandwidth by the intermediate frequency receiver i Calculating the power difference value between the power P detected by the non-access preselector:
，
step S5, converting the step value according to the digital-to-analog
Step configuration is carried out on the power related value of the pre-selector once, i = i +1 is set, the power value Pi in the current bandwidth of the intermediate frequency receiver is detected, and the power difference value is calculated: />
；/>
Step S6, judgment
And/or>
Monotonicity between; if->
And/or>
Monotonically increases in between, it jumps to step S8, if ∑ is ∑ or ∑ is present>
And/or>
If the interval is not monotone increasing, jumping to the step S7;
s7, repeating the step S5 and the step S6 in sequence;
step S8, recording and
the corresponding frequency of the preselector is used as the calibration frequency corresponding to the preselector, and the calibration of the current frequency point is completed;
and S81, setting a calibration frequency step value of the preselector, performing step configuration on the calibration frequency points of the preselector, and calibrating all the calibration frequency points according to the steps from S1 to S8.
Wherein the power-related value comprises a power-related value: power values, voltage values and current values.
The current input of the preselector is configured to change the passband of the preselector, and the power and frequency band in the current bandwidth of the intermediate frequency are in inverse proportion and then in direct proportion. When the frequency of the preselector is far away from the current calibration frequency point, the power is unchanged in the current bandwidth, the preselector preselection frequency is closer to the current calibration frequency point, the power is higher in the current bandwidth, and the preselection frequency is closer to the current calibration frequency point, so that the power difference value is smaller when the power value Pi in the current bandwidth detected by the intermediate frequency receiver corresponding to the preselection frequency is larger, and accordingly, the monotone decreasing characteristic is presented.
According to the embodiment, all frequency points are automatically calibrated through simple power control and configuration, the monotone increasing characteristic of the power difference value detected by the intermediate frequency receiver and the setting of the step value of the calibration frequency, so that the real-time high-efficiency calibration of the calibration frequency points of the preselector is realized, the calibration range is large, and the calibration effect is good.
In step S1, a current calibration frequency point of a preselector is set.
In some embodiments, in a circuit or system for setting the current calibration frequency point of the preselector, the attenuation value of the adjustable attenuator is set to be more than 40dB, and the output end of the adjustable attenuator is provided with a preset low noise amplifier.
Through attenuation control of the adjustable attenuator, the energy of the radio frequency input signal can be controlled within a certain range, the service life and normal use of the receiver can be ensured, therefore, energy attenuation control is carried out on the received radio frequency signal, a better signal measurement and analysis basis can be obtained, the attenuation value of the adjustable attenuator is set to be greater than 40dB, the high-energy radio frequency signal can be greatly attenuated within the controllable range of the receiver, and the signal measurement and analysis effects are improved.
At step S5, step values are converted according to digital-to-analog
Step configuration is carried out on the power related value of the pre-selector once, i = i +1 is set, and the power value P in the current bandwidth of the intermediate frequency receiver is detected i Calculating a power difference value: />
。
In some embodiments, the power-related value is a current value, the control of the power input of the preselector is realized by controlling the input current value of the preselector, and the control of the power input is realized by simple digital-to-analog conversion, so that the method is simple and the cost is low.
A second aspect of the invention discloses a receiver pre-selector calibration system. FIG. 6 is a block diagram of a system for receiver pre-selector calibration in accordance with an embodiment of the present invention; as shown in fig. 6, the system 600 includes:
a first processing module 601 configured to set a preselector current calibration frequency point;
a second processing module 602, configured to connect a bypass of the preselector at the input of the first mixer under the condition that the receiver is not connected to the preselector, and detect the power value P within the bandwidth of the first intermediate frequency signal at the intermediate frequency receiver connected to the output of the first intermediate frequency signal;
a third processing module 603 configured to switch in the preselector, set an initial digital-to-analog conversion value D of the preselector, and configure a digital-to-analog conversion step value
Setting i =1,i denotes the argument of the setting;
a fourth processing module 604 configured for the IF receiver to detect the currentPower value P within bandwidth i Calculating the power difference value between the power P detected by the non-access preselector:
；/>
a fifth processing module 605 configured to step the value by digital-to-analog conversion
Step configuration is carried out on the power related value of the pre-selector once, i = i +1 is set, and the power value P in the current bandwidth of the intermediate frequency receiver is detected i Calculating a power difference value:
；
a sixth processing module 606 configured to determine
And &>
Monotonicity between; if->
And/or>
Monotonically increases in between, jumps to the eighth processing module if->
And/or>
If the difference is not monotone increasing, jumping to a seventh processing module;
a seventh processing module 607 configured to repeat the fifth processing module and the sixth processing module in sequence;
an eighth processing module 608 configured to record and process
Corresponding pre-selector frequency, using the frequency as pre-selectorSelecting a calibration frequency corresponding to the device to finish the calibration of the current frequency point;
and the ninth processing module 609 is configured to set a calibration frequency step value of the preselector, perform step configuration on the preselector calibration frequency point, and perform calibration on all the calibration frequency points through the first to eighth processing modules.
The system according to the second aspect of the invention, the system being specifically configured to: a processor, a digital-to-analog conversion circuit and a voltage-current conversion circuit are connected between the intermediate frequency receiver and the preselector:
the processor analyzes and processes the intermediate frequency signal power of the intermediate frequency receiver, configures a digital-to-analog conversion value according to the processing result and completes digital-to-analog conversion in the digital-to-analog conversion circuit, the digital-to-analog conversion circuit inputs the converted analog signal into the voltage-current conversion circuit, and the voltage-current conversion circuit converts the voltage into the current to complete the control of the input current of the preselector.
The intermediate frequency signal of the intermediate frequency receiver is processed and analyzed through the processor, the digital-to-analog conversion of the digital-to-analog conversion circuit can be controlled, and then the control of the input current of the preselector can be completed through the voltage-current conversion circuit, to sum up, through the processor, the digital-to-analog conversion circuit and the voltage-current conversion circuit, the connection and the control of three simple devices and circuits are realized, the preselector power configuration at the system level is realized, the intermediate frequency receiver detects, the control of the calibration condition is realized between the intermediate frequency receiver and the preselector, the judgment and the feedback are realized, a closed-loop control feedback circuit is formed, a closed-loop control system is provided for the real-time detection and the control of the calibration frequency, the stability of the system is strong, and then the overall efficiency of frequency calibration can be improved, and the calibration effect is greatly improved.
The system according to the second aspect of the invention, optionally/alternatively, the system is specifically configured to: a first radio frequency switch is connected between the input end of the preselector and the preset low-noise amplifier, a second radio frequency switch is connected between the output end of the preselector and the first mixer, and the first radio frequency switch and the second radio frequency switch are both bidirectional switches.
The system according to the second aspect of the invention, the system being specifically configured to: the pre-selector selects an yttrium iron garnet tunable filter YTF.
The band-pass filter adopting the YTF technology can cover high frequency up to 50GHz, and when the center frequency is tuned, the relative bandwidth change of the filter is very small, so that the accurate test of frequency spectrum is ensured.
A third aspect of the invention discloses an electronic device. The electronic device comprises a memory storing a computer program and a processor implementing the steps of a method of calibrating a receiver pre-selector according to any one of the first aspect of the disclosure when the computer program is executed by the processor.
FIG. 7 is a circuit diagram of a receiver pre-selector calibration according to an embodiment of the present invention; as shown in fig. 7, the system 700 includes:
the device comprises an adjustable attenuator (701), a preset low noise amplifier (702), a radio frequency switch (703) (705), a tracking preselector (704), a local oscillator (706), a mixer (707), an intermediate frequency amplifier (708), an intermediate frequency filter (709), intermediate frequency receiver power detection (710), a processor (711), a digital-to-analog conversion circuit (712) and a voltage-to-current conversion circuit (713).
An adjustable attenuator (701), a preset low noise amplifier (702), a radio frequency switch (703) (705), a tracking preselector (704), a local oscillator (706), a mixer (707), an intermediate frequency amplifier (708), an intermediate frequency filter (709) and an intermediate frequency receiver power detector (710) are connected in sequence to form a receiver radio frequency front end.
The radio frequency input is sequentially connected with an adjustable attenuator (701), a preset low noise amplifier (702), a radio frequency switch (703) (705), a mixer (707), an intermediate frequency amplifier (708) and an intermediate frequency filter (709), an output port a of the radio frequency switch (703) is connected with an input port b of a radio frequency switch (5) to form a through connection, an output port b of the radio frequency switch (703) is connected with the input of a tracking preselector (704), the output of the tracking preselector (704) is connected with an input port a of the radio frequency switch (705) to form an YTF path of the tracking preselector (704), and a local oscillator (706) is connected with a local oscillator input port of the mixer (707).
The intermediate frequency output enters an intermediate frequency receiver power detection (710), a detection power result is sent to a processor (711) for data processing, the processor (711) adjusts the value of a digital-to-analog conversion circuit (712) according to the result, and a voltage-current conversion circuit (713) converts the voltage value into a current drive tracking the preselector (704) to realize the adjustment of the passband of the preselector.
The adjustable attenuator (701) mainly plays a role in improving the noise bottom threshold of the receiver, and the attenuation quantity is required to be more than 40dB; the preset low noise amplifier (702) mainly plays a role of amplifying noise floor, and the gain value is required to be more than 20dB. The processor (711) is mainly used for analyzing and processing the intermediate frequency signals, configuring a digital-to-analog conversion value to control the tracking preselector according to the processing result, and recording the result of the calibration data; the digital-to-analog conversion circuit (712) and the voltage-to-current conversion circuit (713) mainly function to convert digital data into analog data, convert voltage into current, and control the tracking preselector.
An output port a of the radio frequency switch (703) is connected with an input port b of the radio frequency switch (705) to form a through path, an output port b of the radio frequency switch (703) is connected with an input of the tracking preselector (704), an output of the tracking preselector (704) is connected with an input port a of the radio frequency switch (705) to form an YTF path, and the calibration condition is judged by the difference of the power after two channels; a down-conversion circuit composed of a local oscillator (706), a mixer (707), an intermediate frequency amplifier (708), an intermediate frequency filter (709) and an intermediate frequency receiver power detection (710) for converting radio frequency into intermediate frequency to detect signal power; the processor (711), the digital-to-analog conversion circuit (712) and the voltage-current conversion circuit (713) mainly process the results of the power detection, control the tracking preselector (704) according to the results and record the calibration results.
As shown in fig. 7, the structure diagram of the calibration circuit of the internal tracking preselector of the receiver has no wideband signal source, comb-wave generator and wideband noise source, the calibration structure is simple, and the complexity and cost of the circuit structure are reduced.
Fig. 8 is a block diagram of an electronic device according to an embodiment of the present invention, and as shown in fig. 8, the electronic device includes a processor, a memory, a communication interface, a display screen, and an input device, which are connected by a system bus. Wherein the processor of the electronic device is configured to provide computing and control capabilities. The memory of the electronic equipment comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The communication interface of the electronic device is used for carrying out wired or wireless communication with an external terminal, and the wireless communication can be realized through WIFI, an operator network, near Field Communication (NFC) or other technologies. The display screen of the electronic equipment can be a liquid crystal display screen or an electronic ink display screen, and the input device of the electronic equipment can be a touch layer covered on the display screen, a key, a track ball or a touch pad arranged on the shell of the electronic equipment, an external keyboard, a touch pad or a mouse and the like.
It will be understood by those skilled in the art that the structure shown in fig. 8 is only a partial block diagram related to the technical solution of the present disclosure, and does not constitute a limitation of the electronic device to which the solution of the present application is applied, and a specific electronic device may include more or less components than those shown in the drawings, or combine some components, or have a different arrangement of components.
A fourth aspect of the invention discloses a computer-readable storage medium. The computer readable storage medium has stored thereon a computer program which, when executed by a processor, performs the steps of a method of receiver pre-selector calibration of any one of the first aspect of the present disclosure.
In summary, the technical scheme provided by the invention has the following technical effects: the preselector can realize real-time calibration of different frequency points, has a wide calibration range, simplifies a calibration structure, reduces the calibration complexity and the calibration cost, and greatly improves the accuracy and the efficiency of the preselector calibration.
It should be noted that the technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, however, as long as there is no contradiction between the combinations of the technical features, the scope of the present description should be considered. The above examples only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent application shall be subject to the appended claims.
Claims (10)
1. A method for receiver pre-selector calibration, the method comprising:
s1, setting a current calibration frequency point of a preselector;
s2, setting a first local oscillation frequency point corresponding to a calibration frequency point of a preselector, connecting a bypass of the preselector to an input end of a first mixer under the condition that a receiver is not connected to the preselector, and detecting a power value P in a bandwidth of a first intermediate-frequency signal by an intermediate-frequency receiver connected to an output end of the first intermediate-frequency signal;
s3, switching in the preselector, setting an initial digital-to-analog conversion value D of the preselector, and configuring a digital-to-analog conversion step value
Setting i =1,i denotes the argument of the setting;
s4, detecting the power value in the current bandwidth by the intermediate frequency receiverP i Calculating the power difference value between the power P detected by the non-access preselector:
，
step S5, converting the step value according to the digital-to-analog
Making one to the power related value of the pre-selectorAnd step-by-step configuration, setting i = i +1, and detecting the power value in the current bandwidth of the intermediate frequency receiverP i Calculating a power difference value: />
；
Step S6, judgment
And/or>
Monotonicity between; if->
And/or>
Monotonically increases in between, it jumps to step S8, if ∑ is ∑ or ∑ is present>
And/or>
If the interval is not monotone increasing, jumping to the step S7;
s7, repeating the step S5 and the step S6 in sequence;
step S8, recording and
the corresponding frequency of the preselector is used as the calibration frequency corresponding to the preselector, and the calibration of the current frequency point is completed;
wherein the power-related value comprises a power-related value: power values, voltage values and current values.
2. A method of calibrating a receiver preselector as claimed in claim 1, wherein the calibration frequency step value for the preselector is set
And step-by-step configuration is carried out on the calibration frequency points of the preselector, and all the calibration frequency points are calibrated according to the steps from S1 to S8.
3. A receiver preselector calibration method as recited in claim 2, wherein said power-related values are current values.
4. A receiver preselector calibration method as claimed in claim 3, wherein a processor, digital to analog conversion circuitry and voltage to current conversion circuitry are connected between the if receiver and the preselector:
the processor analyzes and processes the intermediate frequency signal power of the intermediate frequency receiver, configures a digital-to-analog conversion value according to a processing result and completes digital-to-analog conversion in the digital-to-analog conversion circuit, the digital-to-analog conversion circuit inputs the converted analog signal into the voltage-current conversion circuit, and the voltage-current conversion circuit converts the voltage into the current to complete the control of the input current of the preselector.
5. A method for calibrating a receiver preselector according to any one of claims 1 to 4 wherein the attenuation of the adjustable attenuator at the RF input is greater than 40dB and a preset low noise amplifier is connected to the output of the adjustable attenuator.
6. A method for receiver preselector calibration as claimed in claim 5, wherein a first RF switch is coupled between said preselector input and a preset low noise amplifier, and a second RF switch is coupled between said preselector output and said first mixer, said first RF switch and said second RF switch being bi-directional switches.
7. A method for calibrating a receiver preselector as recited in claim 6, wherein said preselector comprises an yttrium iron garnet tunable filter YTF.
8. A receiver preselector calibration system, said system comprising:
a first processing module configured to set a preselector current calibration frequency point;
the second processing module is configured to set a first local oscillation frequency point corresponding to a calibration frequency point of the preselector, connect a bypass of the preselector at the input end of the first mixer under the condition that the receiver is not connected to the preselector, and detect a power value P in a bandwidth of the first intermediate frequency signal at the intermediate frequency receiver connected to the output end of the first intermediate frequency signal;
a third processing module configured to switch in the preselector, set an initial digital-to-analog conversion value D of the preselector, and configure a digital-to-analog conversion step value
Setting i =1,i denotes the argument of the setting;
a fourth processing module configured to detect a current in-bandwidth power value by the IF receiverP i Calculating the power difference value between the power P detected by the non-access preselector:
；
a fifth processing module configured to step values by digital-to-analog conversion
Step configuration is carried out once on the power related value of the preselector, i = i +1 is set, and the power value in the current bandwidth of the intermediate frequency receiver is detectedP i Calculating a power difference value: />
The power-related value includes a power-related value: power, voltage and current values;
a sixth processing module configured to determine
And/or>
Monotonicity between; if->
And/or>
Monotonically increases in between, jumps to the eighth processing module if->
And/or>
If the difference is not monotone increasing, jumping to a seventh processing module;
a seventh processing module configured to repeat the fifth processing module and the sixth processing module in sequence;
an eighth processing module configured to record and process
And the corresponding frequency of the preselector is used as the calibration frequency corresponding to the preselector, so that the calibration of the current frequency point is completed.
9. An electronic device, comprising a memory storing a computer program and a processor that, when executed, performs the steps of a method of receiver pre-selector calibration as claimed in any one of claims 1 to 7.
10. A computer-readable storage medium, having stored thereon a computer program which, when executed by a processor, carries out the steps of a method of calibrating a receiver pre-selector as claimed in any one of claims 1 to 7.
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| CN110855380A (en) * | 2019-11-29 | 2020-02-28 | 中电科仪器仪表有限公司 | Power calibration device and method for broadband high-precision receiver |
| CN110995368A (en) * | 2019-12-13 | 2020-04-10 | 上海创远仪器技术股份有限公司 | Circuit structure and method for quickly calibrating power for frequency spectrograph |
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| CN104410469B (en) * | 2014-12-04 | 2017-04-19 | 中国电子科技集团公司第四十一研究所 | Calibration method for tracking preselector based on built-in noise source |
| US10677930B2 (en) * | 2015-09-18 | 2020-06-09 | Atc Technologies, Llc | Systems and methods for frequency drift compensation for radio receivers |
| CN107462854B (en) * | 2017-06-29 | 2019-09-24 | 中国电子科技集团公司第四十一研究所 | A kind of method of automatic acquisition YIG tuned filter offset data |
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| CN110855380A (en) * | 2019-11-29 | 2020-02-28 | 中电科仪器仪表有限公司 | Power calibration device and method for broadband high-precision receiver |
| CN110995368A (en) * | 2019-12-13 | 2020-04-10 | 上海创远仪器技术股份有限公司 | Circuit structure and method for quickly calibrating power for frequency spectrograph |
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