CN113132027B - Method and apparatus for correcting operating frequency of radio transmitter - Google Patents
Method and apparatus for correcting operating frequency of radio transmitter Download PDFInfo
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- CN113132027B CN113132027B CN202010031889.5A CN202010031889A CN113132027B CN 113132027 B CN113132027 B CN 113132027B CN 202010031889 A CN202010031889 A CN 202010031889A CN 113132027 B CN113132027 B CN 113132027B
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Abstract
The invention discloses a method and a device for correcting the working frequency of a radio transmitter, wherein the method for correcting comprises the following steps: test reception time interval CLK for acquiring test signals transmitted by a radio transmitter measured With a set target reception time interval CLK target The deviation Error therebetween; acquiring a test reception time interval CLK measured With a target reception time interval CLK target Absolute value of difference between CLK error When the absolute value of the difference CLK error When the value is less than the preset Thd value, the corrected working frequency F of the radio transmitter is obtained according to the Error real (ii) a Or correcting the frequency F based on the deviation Error and the oscillator of the radio transmitter osc _ trim Corrected operating frequency of the radio transmitter, freal; wherein the preset Thd value is set according to an error range of an oscillator of the radio transmitter.
Description
Technical Field
The present invention relates to a radio transmitter technology, and more particularly, to a method and apparatus for correcting an operating frequency of a radio transmitter by correcting a communication signal reception interval.
Background
In order to improve the use experience of users, wireless technologies are increasingly adopted in the market for mobile intelligent terminals, internet of things products and various battery management application chips thereof, wherein the wireless technologies include two basic applications of wireless charging and wireless information transmission. In the field of wireless charging technology, nowadays, wireless charging technology using Inductive coupling (Inductive coupling) is widely used, and its basic principle involves using a wireless transmitter or a wireless receiver, for example, the transmission power of wireless charging can be adjusted by the operating frequency, duty cycle, phase and the like of the wireless transmitter.
The radio transmitter will generate and modulate a radio frequency current and emit a radio wave. According to different radio receivers, the radio transmitter has a situation that the operating frequency is fixed by a specific frequency, so that the frequency error occurring in an oscillator inside a power transmitting chip in the radio transmitter hardly satisfies the allowable error of the operating frequency of the power transmitting chip. For example, when the operating frequency of a certain mobile terminal device is fixed at 127.7kHz, the fast charging mode can be used, the allowable error of the operating frequency of the radio receiver of the mobile terminal device is ± 1kHz, and when the Oscillator (OSC) correction offset of the wireless charging transmitter is set to 127.7kHz by 1%, the offset is ± 1.277kHz, so that the actual frequency range of the radio transmitter deviates from the frequency range entered by the fast charging mode of the original mobile terminal device.
In general, to solve this technical problem, it is common to use, for example, a crystal oscillator in the radio transmitter, outside the power transmitting chip, and to increase the cases. The addition of a crystal oscillator or the like directly increases the manufacturing cost of the product with the wireless charging technology.
Disclosure of Invention
Technical problem to be solved
In order to solve the problem that the radio transmitter has a fixed working frequency with a specific frequency, and simultaneously, external elements such as a crystal oscillator are not added to ensure lower manufacturing cost of the radio transmitter, the invention provides a working frequency correction method of the radio transmitter and a device thereof, and the working frequency correction method of the radio transmitter comprises the following steps:
(II) technical scheme
One aspect of the present invention discloses a method for correcting an operating frequency of a radio transmitter, comprising: test reception time interval CLK for acquiring test signals transmitted by a radio transmitter measured With a set target receiving time interval CLK target The deviation Error between; obtaining a test receipt time interval CLK measured With a target receiving time interval CLK target Absolute value of difference between CLK error When the difference absolute value CLK error When the value is less than the preset Thd value, the corrected working frequency F of the radio transmitter is obtained according to the Error real (ii) a Or correcting the frequency F based on the deviation Error and the oscillator of the radio transmitter osc_trim Obtaining a corrected operating frequency F of a radio transmitter real (ii) a Wherein the preset Thd value is set according to an error range of an oscillator of the radio transmitter.
Optionally, a test reception time interval CLK for acquiring a test signal emitted by a radio transmitter measured With a set target receiving time interval CLK target A deviation Error between, including: receiving a time interval CLK according to a test measured With a set target receiving time interval CLK target The ratio therebetween obtains a deviation Error which satisfies the following formula:
optionally, a test reception time interval CLK is acquired measured With a target reception time interval CLK target Absolute value of difference between CLK error The method comprises the following steps: receiving a time interval CLK according to a test measured With a target reception time interval CLK target Obtaining difference absolute value CLK error Which satisfies the following formula:
CLK error ＝|CLK measured -CLK target |。
optionally, when the difference absolute value CLK error When the value is larger than or equal to the preset Thd value, continuously acquiring the test connection receiving time interval CLK of the connection test signal transmitted by the radio transmitter measured_n With a set successive target receiving interval CLK target_n The successive deviation Error _ n between; and obtaining a test connection receive time interval CLK measured_n And continuing the target reception time interval CLK target_n Successive delta absolute value CLK between error_n 。
Optionally, the corrected operating frequency F of the radio transmitter is obtained from the deviation Error real (ii) a The method comprises the following steps: according to the target operating frequency F of the radio transmitter target And a deviation Error, obtaining a set operating frequency F of the radio transmitter set Which satisfies the following formula:
optionally, a corrected operating frequency F of the radio transmitter is obtained from the deviation Error real (ii) a The method comprises the following steps: according to the set operating frequency F of the radio transmitter set And Error, obtaining the corrected operating frequency F of the radio transmitter real (ii) a It satisfies the following formula:
F real ＝F set ×Error。
optionally, the frequency F is corrected according to the deviation Error and the oscillator of the radio transmitter osc_trim Corrected operating frequency F of radio transmitter real (ii) a The method comprises the following steps: setting frequency F according to oscillator of radio transmitter osc_set Sum Error acquisition radio transmitterOf the oscillator osc_real The following formula is satisfied:
F osc_real ＝F osc_set ×Error。
optionally, the frequency F is corrected according to the deviation Error and the oscillator of the radio transmitter osc_trim Corrected operating frequency F of radio transmitter real (ii) a Further comprising: according to the actual oscillator frequency F of the oscillator of the radio transmitter osc_real And an oscillator set frequency F of an oscillator of the radio transmitter osc_set Obtaining frequency deviation value Trim of oscillator Offset The following formula is satisfied:
wherein, f Trim Is the unit frequency of the oscillator.
Optionally, the frequency F is corrected according to the deviation Error and the oscillator of the radio transmitter osc_trim Corrected operating frequency F of radio transmitter real (ii) a Further comprising: according to frequency deviation Trim of oscillator offset Obtaining an oscillator correction frequency F of an oscillator osc_trim And satisfies the following formula:
F osc_trim ＝F osc_real +Trim Offset ×f Trim ；
according to the target operating frequency F of the radio transmitter target And the oscillator correction frequency F of the oscillator osc_trim Obtaining a corrected operating frequency F of a radio transmitter real The following formula is satisfied:
another aspect of the present invention discloses an operating frequency correction apparatus for a radio transmitter, which is used to implement the operating frequency correction method for a radio transmitter.
(III) advantageous effects
The invention discloses a method and a device for correcting the working frequency of a radio transmitter, wherein the method for correcting comprises the following steps: test reception time interval CLK according to a test signal emitted by a radio transmitter measured With a set target receiving time interval CLK target Error between obtains the corrected operating frequency F of the radio transmitter real (ii) a Or correcting the frequency F from the deviation Error to the oscillator of the radio transmitter osc_trim Corrected operating frequency F of radio transmitter real . Even if the operating frequency of the radio transmitter is corrected using the communication signal reception interval, it is achieved to ensure the same level of accuracy of the operating frequency as the radio receiver at the same time without adding other external components than the radio transmitter.
Drawings
FIG. 1 is a flow chart illustrating a method for calibrating an operating frequency of a radio transmitter according to an embodiment of the present invention;
FIG. 2 is a flow chart illustrating a method for calibrating an operating frequency of a radio transmitter according to another embodiment of the present invention;
FIG. 3 is a flow chart illustrating a method for calibrating an operating frequency of a radio transmitter according to another embodiment of the present invention;
FIG. 4 is a flow chart illustrating a method for calibrating an operating frequency of a radio transmitter according to another embodiment of the present invention; .
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments and the accompanying drawings.
In order to solve the problem that the radio transmitter has a fixed working frequency with a specific frequency, and simultaneously, external elements such as the crystal oscillator are not added to ensure lower manufacturing cost of the radio transmitter, the invention provides a working frequency correction method of the radio transmitter and a device thereof, and the working frequency correction method of the radio transmitter comprises the following steps:
one aspect of the present invention discloses a method for correcting an operating frequency of a radio transmitter, as shown in fig. 1, the method comprising:
s110, obtaining test receiving time interval CLK of test signal transmitted by radio transmitter measured With a set target reception time interval CLK target The deviation Error therebetween. According to the embodiment of the invention, the test signal transmitted by the radio transmitter needs to be received after being transmitted, and a time difference is generated between the transmitting time of the test signal transmitted by the radio transmitter and the receiving feedback time of the corresponding test signal, and the time difference is the corresponding test receiving time interval CLK measured The test reception time interval CLK measured Is an actual signal reception time interval. In contrast, theoretically, in the case where the deviation Error of the actual time interval is not considered (i.e., the deviation Error is 0% in an ideal state), the time difference between the transmission timing of the transmission signal corresponding to the radio transmitter and the reception feedback timing of the corresponding signal is the target time interval CLK target The target time interval CLK target A signal receiving time interval in an ideal state, the target time interval CLK target Presetting is performed by theoretical calculation. Reception time interval CLK by test measured With a set target receiving time interval CLK target The numerical relationship between the two parameters, the deviation Error between the two parameters can be defined.
S120, obtaining a test receiving time interval CLK measured With a target reception time interval CLK target Absolute value of difference between CLK error (ii) a And
according to an embodiment of the invention, the reception interval CLK is received for the above-mentioned actual test measured Relative to the target receiving time interval CLK in the ideal state target When taking the difference between them, the absolute value of the difference may be the absolute value CLK of the difference in the embodiment of the present invention error . The absolute value CLK of the difference is determined by the presence of errors in the signal reception feedback of the radio transmitter error With actual test reception time interval CLK measured The correlation is higher.
S130, current difference absolute value CLK error When the difference is less than the preset Thd value, the corrected working frequency F of the radio transmitter is obtained according to the Error real (ii) a Or correcting the frequency F based on the deviation Error and the oscillator of the radio transmitter osc_trim Obtaining a corrected operating frequency F of a radio transmitter real (ii) a Wherein the preset Thd value is set according to an error range of an oscillator of the radio transmitter.
According to the embodiment of the invention, the error of signal receiving feedback can occur in the radio transmitter, which directly results in the generation of the test receiving time interval CLK measured The generation of erroneous values affects the determination of the above-mentioned deviation Error, causing an unexpected erroneous correction operating frequency to occur in the subsequent frequency correction, so that the operation of the radio transmitter is erroneous, affecting the normal functioning of the device. Thus, the radio transmitter based oscillator OSC allows an error range, and ideally a target reception interval CLK target The corresponding constant, i.e., the preset Thd value, may be obtained, and for example, when the oscillator OSC allowable error range ± 1%, the Thd value satisfies the following equation (1):
Thd＝CLK target ×1％。
the preset Thd value is used to determine the test receiving time interval CLK of the actual test signal measured The difference in (a). When the difference absolute value CLK error Characterizing the test reception interval CLK if it is greater than a predetermined value Thd measured Too large a difference, resulting in erroneous values, and the radio transmitter signal reception feedback is not normal. When the difference absolute value CLK error When the value is less than the preset Thd value, the signal receiving feedback of the radio transmitter is normal, and the correction of the working frequency can be continued.
According to an embodiment of the invention, the Error due to the deviation may also be associated with a corrected operating frequency F according to the radio transmitter real Has relevance. Thus, the corrected operating frequency F of the radio transmitter can be obtained based on the above-mentioned deviation Error real I.e. the correction of the operating frequency of the radio transmitter is determined directly by the relationship of the operating frequency (i.e. the operating frequency) of the radio transmitter.
According to another embodiment of the inventionBy way of example, the deviation Error may also be correlated with the oscillator correction frequency F of the radio transmitter osc_trim Has relevance. Thus, the oscillator correction frequency F based on the above-mentioned deviation Error and the radio transmitter osc_trim It is also possible to obtain a corrected operating frequency F of the radio transmitter real . Specifically, the Trimming algorithm can be adopted to realize the correction of the frequency F of the oscillator osc_trim I.e. the correction of the operating frequency of the radio transmitter is effected by a correction of the operating frequency of the oscillator.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to fig. 2, fig. 3 and fig. 4 and their corresponding embodiments.
According to an embodiment of the invention, a test reception time interval CLK of the test signal transmitted by the radio transmitter is acquired, corresponding to steps S220 and S250 as shown in fig. 2 measured With a set target reception time interval CLK target A deviation Error between, including: according to a test reception time interval CLK measured With a set target receiving time interval CLK target The deviation Error is obtained as a ratio therebetween, which satisfies the following formula (2):
according to an embodiment of the invention, the deviation Error may be the actual test reception time interval CLK measured Relative to the ideal target receiving time interval CLK target The difference or ratio between them. Specifically, the target receiving time interval CLK corresponds to step S210 shown in fig. 2 target Oscillator setting frequency F with oscillator OSC osc_set Related to and satisfying the following formula (3):
CLK target ＝CLK interval ×F osc_set ，
wherein, CLK interval A set reception time interval for the radio transmitter corresponding to the signal. For example, oscillation of oscillator OSC in radio transmitterSet frequency F of the device osc_set At 60MHz, the radio transmitter is CLK interval If the time interval receiving signal is set to "= 10 s", the ideal target receiving time interval CLK is calculated according to the above equation (3) target Comprises the following steps:
CLK target ＝CLK interval ×F osc_set ＝10s×60MHz＝600×10 6 clk，
clk is a time unit representing a time interval in the embodiment of the present invention.
Actual test reception time interval CLK when corresponding test signals are acquired by the radio transmitter measured Is 660X 10 6 clk, according to the above equation (2), corresponding to step S250 shown in fig. 2, the deviation Error is:
according to an embodiment of the present invention, a test reception interval CLK is obtained, corresponding to step S230 shown in FIG. 2 measured With a target reception time interval CLK target Absolute value of difference between CLK error The method comprises the following steps: receiving a time interval CLK according to a test measured With a target reception time interval CLK target Taking the difference between them (i.e., difference) to obtain the absolute value of the difference CLK error Which satisfies the following formula (4):
CLK error ＝|CLK measured -CLK target |。
in accordance with an embodiment of the present invention, corresponding to step S230 as shown in FIG. 2, at CLK as described above measured Is 660 multiplied by 10 6 clk，CLK target Is 600 x 10 6 When CLK is present, the absolute value of the difference CLK is determined according to equation (4) error Comprises the following steps:
at this time, when the allowable error allowable range of the oscillator OSC is ± 1%, the preset Thd value is as follows according to the above formula (1):
Thd＝CLK target ×1％＝600×10 6 clk×1％＝6×10 6 clk。
at this time, the difference absolute value CLK error ＝60×10 6 clk greater than preset Thd value =6 × 10 6 clk, therefore, indicates that the radio transmitter has a signal receiving feedback abnormality at this time, and the calibration of the operating frequency of the radio transmitter cannot be continued. Only in the above relation with respect to satisfying the difference absolute value CLK error If the Thd value is less than the preset Thd value, the calibration of the operating frequency of the radio transmitter may be continued, corresponding to step S240 shown in fig. 2.
According to an embodiment of the invention, when the difference absolute value CLK error When the value is larger than or equal to the preset Thd value, continuously acquiring the continuous test receiving time interval CLK of the continuous test signal transmitted by the radio transmitter measured_n With a set successive target receiving interval CLK target_n The deviation Error _ n therebetween; and obtaining the receiving time interval CLK of the continuous test measured_n And continuing the target reception interval CLK target_n Absolute value of the difference between them CLK error_n . Here, those skilled in the art should understand that n is a distinguishing symbol for distinguishing the related parameters mentioned above, and corresponds to step S240 shown in fig. 2, and the process goes back to step S220 from step S240.
When the difference absolute value CLK error And when the value is larger than or equal to the preset Thd value, the abnormal signal receiving feedback of the radio transmitter occurs at the moment. Thus, continuing the above-described method sequence, the radio transmitter continues to transmit the subsequent test signal, through which the subsequent test reception time interval CLK of the subsequent test signal is received measured_n Set successive target receiving time interval CLK target_n Obtaining absolute value of successive difference CLK error_n Continuously comparing with the preset Thd value until the absolute value CLK of the continuous difference is met error_n If the value is less than the preset value Thd, the calibration of the operating frequency of the radio transmitter can be continued.
According to an embodiment of the present inventionWhen the absolute value of the difference CLK error Less than a predetermined Thd value or a successive delta absolute value CLK error_n If the value is less than the preset Thd, the correction of the operating frequency of the radio transmitter is directly determined by the relationship of the operating frequency (i.e., the operating frequency) of the radio transmitter, which corresponds to step S260 shown in fig. 2.
According to an embodiment of the invention, the corrected operating frequency F of the radio transmitter is obtained from the deviation Error real The method comprises the following steps: according to the target operating frequency F of the radio transmitter target And Error, obtaining the set operating frequency F of the radio transmitter set Corresponding to step S261 shown in fig. 3, it satisfies the following formula (5):
wherein the working frequency F is set set Is the actual operating frequency of the radio transmitter before calibration is performed. After the completion of the correction, the value of the operating frequency after the correction can be understood as being set at the set operating frequency F set The above embodiment, that is, after completing the correction, satisfies F set ＝F real 。
In order to achieve a correction of the operating frequency of the radio transmitter while ensuring a small difference in power transmission before and after the correction, it is necessary to set an initial operating frequency, i.e. the target operating frequency F of the radio transmitter, in an ideal state, i.e. when the deviation Error is 0% target . At the same time, the set operating frequency F of the radio transmitter set Is based on the following equation (6):
i.e. receiving the time interval CLK according to the test measured With a set target reception time interval CLK target With a deviation Error, while the target operating frequency F of the radio transmitter target And setting wireless transmitterSet operating frequency F of radiator set Is also the deviation Error. Thus, the test reception time interval CLK based on the test signal of the radio transmitter measured With a target receiving time interval CLK target The obtained deviation Error may again be dependent on the set operating frequency F of the set radio transmitter set Corresponding determination of the set operating frequency F of the radio transmitter set . Specifically, when CLK is asserted target ＝600×10 6 clk，CLK measured ＝660×10 6 clk, the deviation Error may be 110% by the above formula, if the target operating frequency F of the radio transmitter is target If =127.7kHz, the corresponding set operating frequency F of the radio transmitter is determined according to the above equation (5) set Comprises the following steps:
wherein, in the ideal state where Error is 0%, the above formula can substantially satisfy F set ＝F target 。
According to an embodiment of the invention, the corrected operating frequency F of the radio transmitter is obtained from the deviation Error real (ii) a The method comprises the following steps: according to a set operating frequency F of the radio transmitter set And Error, obtaining the corrected operating frequency F of the radio transmitter real Corresponding to step S262 shown in fig. 3, it satisfies the following formula (7):
F real ＝F set ×Error。
due to setting the working frequency F set Substantially the operating frequency of the radio transmitter before calibration, and therefore, the calibration operating frequency F real The ratio of (c) can also satisfy the deviation Error. Specifically, according to the contents of the above embodiment, when the operating frequency F is set set =116.09kHz, and the corrected operating frequency F is calculated according to the above equation (7) when the deviation Error =110% real Comprises the following steps:
F real ＝F set ×Error＝116.09kHz×110％＝127.69kHz，
wherein the corrected operating frequency F real =127.69kHz is the corrected operating frequency F of the radio transmitter to be obtained by the embodiment of the present invention real The radio transmitter is operated at the corrected operating frequency F real Operation is carried out at =127.69kHz, and the set operating frequency after correction at this time satisfies: f set ＝F real =127.69kHz, in particular, as can be seen from the above embodiments, the corrected operating frequency F real =127.69kHz and corresponding target operating frequency F target =127.7kHz almost identical.
Therefore, the operating frequency correction method of a radio transmitter according to the present invention, that is, correcting the operating frequency of the radio transmitter using only the communication signal reception interval, achieves the simultaneous assurance of the accuracy of the operating frequency at the same level as that of the radio receiver without adding other external components other than the radio transmitter, and at the same time, reduces the cost of correcting the operating frequency, which is beneficial to the actual operating frequency correction application of the radio transmitter.
According to another embodiment of the invention, when the difference absolute value CLK error Less than a predetermined Thd value or a successive difference absolute value CLK error_n Below the preset Thd value, the correction of the operating frequency of the radio transmitter may be implemented by correcting the operating frequency of the oscillator OSC, corresponding to step S270 shown in fig. 2.
The radio transmitter comprises a high frequency carrier oscillator capable of generating a constant amplitude oscillation and/or a low frequency oscillator capable of generating a low frequency modulation signal, the operating frequency of the oscillator having a correlation with the operating frequency of the radio transmitter. In an embodiment of the present invention, specifically, the obtaining of the operating frequency of the radio transmitter may be implemented by correcting the frequency through the operation of the oscillator according to the Trimming calculation method.
According to an embodiment of the invention, the frequency F is corrected on the basis of the deviation Error and the oscillator of the radio transmitter osc_trim Corrected operating frequency F of radio transmitter real (ii) a The method comprises the following steps: according to oscillator setting of oscillator of radio transmitterFrequency F osc_set And Error acquisition radio transmitter oscillator actual frequency F osc_real Corresponding to step S271 shown in fig. 4, the following formula (8) is satisfied:
F osc_real ＝F osc_set ×Error。
according to an embodiment of the invention, the set operating frequency F with the radio transmitter set Correspondingly, the oscillator has an oscillator set frequency F for the actual operation of the oscillator before the correction of the operating frequency osc_set The oscillator sets a frequency F osc_set Oscillator actual frequency F corresponding thereto osc_real The ratio of (d) may also be equal to the deviation Error proposed in the above embodiment. Specifically, according to the contents of the above embodiments, when the oscillator of the oscillator sets the frequency F osc_set =60MHz, and the deviation Error =110%, the oscillator actual frequency F is calculated according to the above equation (8) osc_real Comprises the following steps:
F osc_real ＝F osc_set ×Error＝60MHz×110％＝66MHz，
the above is to some extent understood to mean that the operating frequency corresponding to the actual operation of the oscillator after correction of the operating frequency of the radio transmitter is 66MHz.
According to an embodiment of the invention, the frequency F is corrected on the basis of the deviation Error and the oscillator of the radio transmitter osc_trim Corrected operating frequency F of a radio transmitter real (ii) a Further comprising: according to the actual oscillator frequency F of the oscillator of the radio transmitter osc_real And an oscillator setting frequency F of an oscillator of the radio transmitter osc_set Obtaining frequency deviation value Trim of oscillator Offset Corresponding to step S272 shown in fig. 4, the following formula (9) is satisfied:
wherein f is Trim Is the unit frequency of the oscillator, the unit frequency f Trim For cores corresponding by radio transmittersThe frequency of the minimum unit, specifically the unit frequency f, of the chip register when correcting the oscillator operating frequency (i.e., the operating frequency) Trim The value varies according to the specific design of the chip register, and is generally a constant value of the corresponding chip register. In the embodiment of the present invention, the unit frequency f Trim The values are preset according to the design requirements of the actual chip registers.
According to the embodiment of the invention, the frequency deviation value Trim of the oscillator can be obtained through the formula Offset The frequency deviation Trim Offset With actual oscillator frequency F of the oscillator of the radio transmitter osc_real And an oscillator setting frequency F of the oscillator of the radio transmitter osc_set According to the unit frequency f Trim The values are positively correlated. Specifically, according to the contents of the above embodiment, when the operating frequency F is set osc_set =60MHz, oscillator actual frequency F osc_real =66MHz, preset unit frequency f Trim =0.31MHz, the frequency deviation value Trim according to the above equation (9) Offset Comprises the following steps:
wherein, combining the above formula, the frequency deviation value Trim Offset Essentially corresponds to the adjustment value according to the deviation Error during the correction of the oscillator operating frequency, which is essentially defined according to the signal transmission time interval and the reception time interval of the radio transmitter.
According to an embodiment of the invention, the frequency F is corrected on the basis of the deviation Error and the oscillator of the radio transmitter osc_trim Corrected operating frequency F of a radio transmitter real (ii) a Further comprising: according to frequency deviation Trim of oscillator Offset Obtaining an oscillator correction frequency F of an oscillator osc_trim Corresponding to step S273 shown in fig. 4, the following formula (10) is satisfied:
F osc_trim ＝F osc_real +Trim Offset ×f Trim ；
according to an embodiment of the invention, the correction frequency F of the oscillator osc_trim According to the frequency deviation Trim of the oscillator Offset With unit frequency f of the oscillator Trim By the product of the oscillator's actual frequency F osc_real And (4) performing definition. Specifically, according to the contents of the above embodiment, when the oscillator actual frequency F osc_real =66MHz, preset unit frequency f Trim =0.31MHz, frequency deviation value Trim Offset In case of = -19, the oscillator correction frequency F of the oscillator is in accordance with the above equation (10) osc_trim Comprises the following steps:
therefore, the oscillator can be based on the frequency deviation Trim of the oscillator Offset Completing the correction of the running frequency of the oscillator with the oscillator correction frequency of F osc_trim ＝60.11MHz。
According to an embodiment of the invention, the target operating frequency F of the radio transmitter is determined target And the oscillator correction frequency F of the oscillator osc_trim Obtaining a corrected operating frequency F of a radio transmitter real Corresponding to step S274 shown in fig. 4, the following formula (11) is satisfied:
according to an embodiment of the invention, the correction frequency F of the oscillator is obtained osc_trim Then, based on the above formula (11), the corrected operating frequency F of the radio transmitter corresponding to the oscillator can be obtained real . In particular, according to the contents of the above-described embodiment, when the target operating frequency F of the radio transmitter target =127.7kHz, oscillator set frequency F of the oscillator osc_set =60MHz, the oscillator correction frequency of the oscillator is F osc_trim 60.11MHz, according toThe above equation (11), the corrected operating frequency F of the corresponding radio transmitter real Comprises the following steps:
wherein the corrected operating frequency F real =127.93kHz is the corrected operating frequency F of the radio transmitter to be obtained by the embodiment of the present invention real . In particular, it can be seen from the above embodiments that the corrected operating frequency F real =127.93kHz and corresponding target operating frequency F target =127.7kHz almost identical.
Therefore, the operating frequency correction method of a radio transmitter according to the present invention, that is, correcting the operating frequency of the radio transmitter using only the communication signal reception interval, achieves the purpose of ensuring the accuracy of the operating frequency at the same level as that of the radio receiver while not adding any external component other than the radio transmitter, and at the same time, reduces the cost of correcting the operating frequency, which is beneficial to the actual operating frequency correction application of the radio transmitter.
Another aspect of the present invention discloses an operating frequency correction apparatus for a radio transmitter, so as to implement the operating frequency correction method for a radio transmitter.
According to the embodiment of the present invention, according to the operating frequency correction method of the radio transmitter described above, the operating frequency correction device of the radio transmitter of the present invention can obtain the accurate corrected operating frequency F of the radio transmitter only by software without increasing the hardware cost without adding external parts real Has important practical application value.
The present disclosure also provides a computer-readable storage medium, which may be embodied in the device/apparatus/system described in the above embodiments; or may exist separately and not be assembled into the device/apparatus/system. The above-mentioned computer-readable storage medium carries one or more programs which, when executed, implement the operating frequency correction method of a radio transmitter according to an embodiment of the present disclosure.
According to embodiments of the present disclosure, the computer-readable storage medium may be a non-volatile computer-readable storage medium, which may include, for example but is not limited to: a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the present disclosure, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
Those skilled in the art will appreciate that various combinations and/or combinations of features recited in the various embodiments and/or claims of the present disclosure can be made, even if such combinations or combinations are not expressly recited in the present disclosure. In particular, various combinations and/or combinations of the features recited in the various embodiments and/or claims of the present disclosure may be made without departing from the spirit or teaching of the present disclosure. All such combinations and/or associations are within the scope of the present disclosure.
The above-mentioned embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only examples of the present invention, and should not be construed as limiting the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A method of correcting an operating frequency of a radio transmitter, comprising:
acquiring a test reception time interval CLK of a test signal transmitted by said radio transmitter measured With a set target reception time interval CLK target The deviation Error therebetween;
obtaining the test reception time interval CLK measured With a target reception time interval CLK target Absolute value of difference between CLK error ；
When the difference absolute value CLK error When the value of the Thd is less than the preset value Thd,
obtaining a corrected operating frequency F of the radio transmitter from the deviation Error real (ii) a Or
Correcting the frequency F from the deviation Error and the oscillator of the radio transmitter osc_trim Obtaining a corrected operating frequency F of said radio transmitter real ；
Wherein the preset Thd value is set according to an error range of an oscillator of the radio transmitter;
wherein a test reception time interval CLK during said acquiring of a test signal emitted by said radio transmitter measured With a set target reception time interval CLK target The deviation Error therebetween includes:
according to the test reception time interval CLK measured With a set target reception time interval CLK target The deviation Error is obtained as the ratio between, which satisfies the following equation:
wherein the target receiving time interval CLK target An oscillator set frequency F with an oscillator of the radio transmitter osc_set Satisfies the following formula:
CLK target ＝CLK interval ×F osc_set ，
wherein, CLK interval A set reception time interval for the radio transmitter corresponding signal.
2. Method for operating frequency correction of a radio transmitter according to claim 1, characterized in that said acquisition of said test reception time interval CLK measured With a target reception time interval CLK target Absolute value of difference between CLK error The method comprises the following steps:
according to the test reception time interval CLK measured With a target receiving time interval CLK target Obtaining the difference absolute value CLK error It satisfies the following formula:
CLK error ＝|CLK measured -CLK target |。
3. the method of claim 1, wherein the difference absolute value CLK is used as the difference absolute value error When the value is larger than or equal to the preset Thd value, continuing to perform
Obtaining a test successive reception time interval CLK of successive test signals transmitted by said radio transmitter measured_n And the set successive target receiving time interval CLK target_n Successive deviation Error _ n therebetween; and
obtaining the test connection receiving time interval CLK measured_n And continuing the target reception time interval CLK target_n Absolute value of the difference between them CLK error_n 。
4. The method of claim 1, wherein said obtaining a corrected operating frequency F of said radio transmitter from said deviation Error is performed real (ii) a The method comprises the following steps:
according to a target operating frequency F of the radio transmitter target And said deviation Error, obtaining a set operating frequency F of said radio transmitter set Which satisfies the following formula:
5. operating frequency correction for a radio transmitter according to claim 4Method, characterized in that said acquisition of the corrected operating frequency F of said radio transmitter is based on said deviation Error real (ii) a The method comprises the following steps:
according to a set operating frequency F of the radio transmitter set And said deviation Error, obtaining a corrected operating frequency F of said radio transmitter real (ii) a It satisfies the following formula:
F real ＝F set ×Error。
6. method for correcting the operating frequency of a radio transmitter according to claim 1, characterized in that said correcting the frequency F from the deviation Error to the oscillator of the radio transmitter is carried out osc_trim Corrected operating frequency F of said radio transmitter real (ii) a The method comprises the following steps:
according to an oscillator setting frequency F of an oscillator of the radio transmitter osc_set And said Error obtaining an oscillator actual frequency F of an oscillator of said radio transmitter osc_real The following formula is satisfied:
F osc_real ＝F osc_set ×Error。
7. the method of claim 6, wherein the correction frequency F is adjusted according to the deviation Error and the oscillator of the radio transmitter osc_trim Corrected operating frequency F of said radio transmitter real (ii) a Further comprising:
according to an oscillator actual frequency F of an oscillator of the radio transmitter osc_real And an oscillator set frequency F of an oscillator of the radio transmitter osc_set Obtaining a frequency deviation Trim of the oscillator Offset And satisfies the following formula:
wherein, the f Trim Is the oscillationUnit frequency of the device.
8. The method of claim 7, wherein the correction frequency F is adjusted according to the deviation Error and the oscillator of the radio transmitter osc_trim Corrected operating frequency F of said radio transmitter real (ii) a Further comprising:
according to the frequency deviation Trim of the oscillator Offset Obtaining an oscillator correction frequency F of the oscillator osc_trim The following formula is satisfied:
F osc_trim ＝F osc_real +Trim Offset ×f Trim ；
according to a target operating frequency F of the radio transmitter target And an oscillator correction frequency F of said oscillator osc_trim Obtaining a corrected operating frequency F of said radio transmitter real The following formula is satisfied:
9. an operating frequency correction apparatus of a radio transmitter for implementing the operating frequency correction method of the radio transmitter claimed in any one of claims 1 to 8.
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