CN113132027A - 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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- CN113132027A CN113132027A CN202010031889.5A CN202010031889A CN113132027A CN 113132027 A CN113132027 A CN 113132027A CN 202010031889 A CN202010031889 A CN 202010031889A CN 113132027 A CN113132027 A CN 113132027A
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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 transmittermeasuredWith a set target reception time interval CLKtargetThe deviation Error between; acquiring a test reception time interval CLKmeasuredWith a target reception time interval CLKtargetAbsolute value of difference between CLKerrorWhen the absolute value of the difference CLKerrorWhen the difference is less than the preset Thd value, the corrected working frequency F of the radio transmitter is obtained according to the Errorreal(ii) a Or correcting the frequency F based on the deviation Error and the oscillator of the radio transmitterosc_trimCorrected 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 transmit a radio wave. The radio transmitter has a case where an operating frequency is fixed with a specific frequency according to a corresponding radio receiver, so that it is difficult for a frequency error occurring in an oscillator inside a power transmitting chip in the radio transmitter to satisfy a permissible 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 transmission chip. 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 an operating frequency correction method of a radio transmitter, including: test reception time interval CLK for acquiring test signals transmitted by a radio transmittermeasuredWith a set target reception time interval CLKtargetThe deviation Error between; acquiring a test reception time interval CLKmeasuredWith a target reception time interval CLKtargetAbsolute value of difference between CLKerrorWhen the absolute value of the difference CLKerrorWhen the difference is less than the preset Thd value, the corrected working frequency F of the radio transmitter is obtained according to the Errorreal(ii) a Or correcting the frequency F based on the deviation Error and the oscillator of the radio transmitterosc_trimObtaining a corrected operating frequency F of a radio transmitterreal(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 transmittermeasuredWith a set target reception time interval CLKtargetA deviation Error between, including: receiving a time interval CLK according to a testmeasuredWith a set target reception time interval CLKtargetThe ratio therebetween obtains a deviation Error which satisfies the following formula:
optionally, a test reception time interval CLK is acquiredmeasuredWith a target reception time interval CLKtargetAbsolute value of difference between CLKerrorThe method comprises the following steps: receiving a time interval CLK according to a testmeasuredWith a target reception time interval CLKtargetObtaining difference absolute value CLKerrorIt satisfies the following formula:
CLKerror＝|CLKmeasured-CLKtarget|。
optionally, when the difference absolute value CLKerrorWhen 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 transmittermeasured_nWith a set successive target receiving interval CLKtarget_nThe successive deviation Error _ n between; and obtaining the test continuous receiving time interval CLKmeasured_nAnd continuing the target reception interval CLKtarget_nAbsolute value of the difference between them CLKerror_n。
Optionally, the corrected operating frequency F of the radio transmitter is obtained from the deviation Errorreal(ii) a The method comprises the following steps: according to the target operating frequency F of the radio transmittertargetAnd Error, obtaining the set operating frequency F of the radio transmittersetIt satisfies the following formula:
optionally, the corrected operating frequency F of the radio transmitter is obtained from the deviation Errorreal(ii) a The method comprises the following steps: according to the set operating frequency F of the radio transmittersetAnd Error, obtaining the corrected operating frequency F of the radio transmitterreal(ii) a It satisfies the following formula:
Freal＝Fset×Error。
optionally, the frequency F is corrected according to the deviation Error and the oscillator of the radio transmitterosc_trimCorrected operating frequency F of radio transmitterreal(ii) a The method comprises the following steps: setting frequency F according to oscillator of radio transmitterosc_setSum Error acquisition radio transmitter oscillator actual frequency Fosc_realThe following formula is satisfied:
Fosc_real＝Fosc_set×Error。
optionally, the frequency F is corrected according to the deviation Error and the oscillator of the radio transmitterosc_trimCorrected operating frequency F of radio transmitterreal(ii) a Further comprising: according to the actual oscillator frequency F of the oscillator of the radio transmitterosc_realAnd an oscillator set frequency F of an oscillator of the radio transmitterosc_setObtaining frequency deviation value Trim of oscillatorOffsetThe following formula is satisfied:
wherein f isTrimIs the unit frequency of the oscillator.
Optionally, the frequency F is corrected according to the deviation Error and the oscillator of the radio transmitterosc_trimCorrected operating frequency F of radio transmitterreal(ii) a Further comprising: according to frequency deviation Trim of oscillatorOffsetObtaining an oscillator correction frequency F of an oscillatorosc_trimThe following formula is satisfied:
Fosc_trim＝Fosc_real+TrimOffset×fTrim；
according to the target operating frequency F of the radio transmittertargetAnd the oscillator correction frequency F of the oscillatorosc_trimObtaining a corrected operating frequency F of a radio transmitterrealThe 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 transmittermeasuredWith a set target reception time interval CLKtargetError between obtains the corrected operating frequency F of the radio transmitterreal(ii) a Or correcting the frequency F based on the deviation Error and the oscillator of the radio transmitterosc_trimCorrected operating frequency F of radio transmitterreal. 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 described in further detail below with reference to specific 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 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:
one aspect of the present invention discloses an operating frequency correction method of a radio transmitter, as shown in fig. 1, the correction method comprising:
s110, obtaining test receiving time interval CLK of test signal transmitted by radio transmittermeasuredWith a set target reception time interval CLKtargetThe deviation Error between. 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 test signal, and the time difference is the corresponding test receiving time interval CLKmeasuredThe test reception time interval CLKmeasuredIs an actual signal reception time interval. In contrast, theoretically, in the case where the deviation Error exists regardless of the actual time interval (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 CLKtargetThe target time interval CLKtargetA signal receiving time interval in an ideal state, the target time interval CLKtargetPresetting is performed by theoretical calculation. Reception time interval CLK by testmeasuredWith a set target reception time interval CLKtargetThe numerical relationship between them, the deviation Error between the two parameters can be defined.
S120, obtaining a test receiving time interval CLKmeasuredWith a target reception time interval CLKtargetAbsolute value of difference between CLKerror(ii) a And
according to an embodiment of the invention, the reception interval CLK is received for the above-mentioned actual testmeasuredRelative to the ideal target receiving time interval CLKtargetWhen 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 inventionerror. The absolute value CLK of the difference is determined by the presence of errors in the signal reception feedback of the radio transmittererrorWith actual test reception interval CLKmeasuredThe correlation is higher.
S130, when the difference is absoluteFor value CLKerrorWhen the difference is less than the preset Thd value, the corrected working frequency F of the radio transmitter is obtained according to the Errorreal(ii) a Or correcting the frequency F based on the deviation Error and the oscillator of the radio transmitterosc_trimObtaining a corrected operating frequency F of a radio transmitterreal(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 CLKmeasuredThe 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 CLKtargetThe corresponding constant, i.e., preset Thd value, may be obtained, for example, when the oscillator OSC allowable error allowable range ± 1%, the Thd value satisfies the following formula (1):
Thd＝CLKtarget×1％。
the preset Thd value is used to determine the test receiving time interval CLK of the actual test signalmeasuredThe difference in (a). When the difference absolute value CLKerrorCharacterizing the test reception interval CLK if it is greater than a predetermined value ThdmeasuredToo large a difference, resulting in erroneous values and an abnormal signal reception feedback from the radio transmitter. When the difference absolute value CLKerrorWhen 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 may also be associated with a corrected operating frequency F according to the radio transmitterrealHas relevance. Thus, the corrected operating frequency F of the radio transmitter can be obtained based on the above-mentioned deviation ErrorrealI.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 invention, the deviation Error may also be correlated with the oscillator correction frequency F of the radio transmitterosc_trimHas relevance. Thus, the oscillator correction frequency F based on the above-mentioned deviation Error and the radio transmitterosc_trimIt is also possible to obtain a corrected operating frequency F of the radio transmitterreal. Specifically, the Trimming algorithm can be adopted to realize the correction of the frequency F of the oscillatorosc_trimI.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. 2measuredWith a set target reception time interval CLKtargetA deviation Error between, including: receiving a time interval CLK according to a testmeasuredWith a set target reception time interval CLKtargetThe ratio therebetween obtains a deviation Error which satisfies the following formula (2):
according to an embodiment of the invention, the deviation Error may be the actual test reception time interval CLKmeasuredRelative to the ideal target receiving time interval CLKtargetThe difference or ratio between them. Specifically, the target receiving interval CLK corresponds to step S210 shown in fig. 2targetOscillator setting frequency F with oscillator OSCosc_setRelated to and satisfying the following formula (3):
CLKtarget＝CLKinterval×Fosc_set，
wherein, CLKintervalA set reception time interval for the radio transmitter corresponding to the signal. E.g. in radio transmissionOscillator setting frequency F of oscillator OSC of oscillatorosc_setAt 60MHz, the radio transmitter is CLKintervalWhen the time interval receiving signal is 10s, the ideal target receiving time interval CLK is calculated according to the above equation (3)targetComprises the following steps:
CLKtarget＝CLKinterval×Fosc_set＝10s×60MHz＝600×106clk，
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 transmittermeasuredIs 660 multiplied by 106clk, 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. 2measuredWith a target reception time interval CLKtargetAbsolute value of difference between CLKerrorThe method comprises the following steps: receiving a time interval CLK according to a testmeasuredWith a target reception time interval CLKtargetDifference between them (i.e., difference) to obtain difference absolute value CLKerrorWhich satisfies the following formula (4):
CLKerror＝|CLKmeasured-CLKtarget|。
in accordance with an embodiment of the present invention, corresponding to step S230 as shown in FIG. 2, at CLK as described abovemeasuredIs 660 multiplied by 106clk，CLKtargetIs 600 x 106When CLK is present, the absolute value of the difference CLK is determined according to equation (4)errorComprises the following steps:
CLKerror＝|CLKmeasured-CLKtarget|
＝|660×106clk-600×106clk|
＝60×106clk
at this time, when obtaining the allowable error allowable range of the oscillator OSC as ± 1%, the preset Thd value is as follows according to the above formula (1):
Thd＝CLKtarget×1％＝600×106clk×1％＝6×106clk。
at this time, the difference absolute value CLKerror＝60×106clk greater than a preset value Thd of 6 × 106clk, therefore, it 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 CLKerrorIf 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 CLKerrorWhen 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 transmittermeasured_nWith a set successive target receiving interval CLKtarget_nThe deviation Error _ n therebetween; and obtaining the receiving time interval CLK of the continuous testmeasured_nAnd continuing the target reception interval CLKtarget_nAbsolute value of the difference between them CLKerror_n. Here, it should be understood by those skilled in the art 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 returns to step S220 from step S240.
When the difference absolute value CLKerrorAnd 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 receivedmeasured_nSet successive target receiving time interval CLKtarget_nObtaining absolute value of successive difference CLKerror_nContinuously comparing with the preset Thd value until the absolute value CLK of the continuous difference is meterror_nWhen the value is less than the preset Thd value, the wireless transmitter can be continuously operatedThe frequency is corrected.
According to an embodiment of the invention, when the difference absolute value CLKerrorLess than a predetermined Thd value or a successive difference absolute value CLKerror_nBelow the preset Thd value, the correction of the operating frequency of the radio transmitter is directly determined by the relationship of the operating frequency (i.e., operating frequency) of the radio transmitter, corresponding 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 ErrorrealThe method comprises the following steps: according to the target operating frequency F of the radio transmittertargetAnd Error, obtaining the set operating frequency F of the radio transmittersetCorresponding to step S261 shown in fig. 3, it satisfies the following formula (5):
wherein the working frequency F is setsetIs 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 FsetThe above embodiment, that is, after completing the correction, satisfies Fset＝Freal。
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 transmittersetIs based on the following equation (6):
i.e. receiving the time interval CLK according to the testmeasuredWith a set target reception time interval CLKtargetThe ratio between them is the deviation Error,at the same time, the target operating frequency F of the radio transmittertargetAnd setting the operating frequency F of the radio transmittersetIs also the deviation Error. Thus, the test reception time interval CLK based on the test signal of the radio transmittermeasuredWith a target reception time interval CLKtargetThe obtained deviation Error may again be dependent on the set operating frequency F of the set radio transmittersetCorresponding determination of the set operating frequency F of the radio transmitterset. Particularly when CLK is usedtarget＝600×106clk，CLKmeasured＝660×106clk, the deviation Error may be 110% by the above formula if the target operating frequency F of the radio transmitter istarget127.7kHz, the set operating frequency F of the corresponding radio transmitter is according to equation (5) abovesetComprises the following steps:
wherein, in the ideal state of Error of 0%, the above formula can substantially satisfy Fset＝Ftarget。
According to an embodiment of the invention, the corrected operating frequency F of the radio transmitter is obtained from the deviation Errorreal(ii) a The method comprises the following steps: according to the set operating frequency F of the radio transmittersetAnd Error, obtaining the corrected operating frequency F of the radio transmitterrealCorresponding to step S262 shown in fig. 3, it satisfies the following formula (7):
Freal＝Fset×Error。
due to setting the working frequency FsetSubstantially the operating frequency of the radio transmitter before calibration, and therefore, the calibration operating frequency FrealThe ratio of (d) can also satisfy the deviation Error. Specifically, according to the contents of the above embodiment, when the operating frequency F is setset116.09kHz, and a deviation Error of 110%, the corrected operating frequency F is in accordance with equation (7) aboverealComprises the following steps:
Freal＝Fset×Error＝116.09kHz×110％＝127.69kHz，
wherein the corrected operating frequency Freal127.69kHz is the corrected operating frequency F of the radio transmitter to be obtained by the embodiment of the present inventionrealThe radio transmitter is operated at the corrected operating frequency FrealThe operation was carried out at 127.69kHz, and the set operating frequency after correction at this time satisfied: fset＝FrealAt 127.69kHz, the corrected operating frequency F can be seen in particular from the above-described embodimentreal127.69kHz and corresponding target operating frequency FtargetAlmost identical at 127.7 kHz.
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.
According to another embodiment of the invention, when the difference absolute value CLKerrorLess than a predetermined Thd value or a successive difference absolute value CLKerror_nBelow 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 dependence on 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 transmitterosc_trimCalibrator for radio transmittersAs frequency Freal(ii) a The method comprises the following steps: setting frequency F according to oscillator of radio transmitterosc_setSum Error acquisition radio transmitter oscillator actual frequency Fosc_realCorresponding to step S271 shown in fig. 4, the following formula (8) is satisfied:
Fosc_real＝Fosc_set×Error。
according to an embodiment of the invention, the set operating frequency F with the radio transmittersetCorrespondingly, the oscillator has an oscillator set frequency F for the actual operation of the oscillator before the correction of the operating frequencyosc_setThe oscillator sets a frequency Fosc_setOscillator actual frequency F corresponding theretoosc_realThe 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 Fosc_setWhen the deviation Error is 110% at 60MHz, the oscillator actual frequency F is calculated according to the above equation (8)osc_realComprises the following steps:
Fosc_real＝Fosc_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 66 MHz.
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 transmitterosc_trimCorrected operating frequency F of radio transmitterreal(ii) a Further comprising: according to the actual oscillator frequency F of the oscillator of the radio transmitterosc_realAnd an oscillator set frequency F of an oscillator of the radio transmitterosc_setObtaining frequency deviation value Trim of oscillatorOffsetCorresponding to step S272 shown in fig. 4, the following formula (9) is satisfied:
wherein f isTrimIs oscillatingUnit frequency of the device, the unit frequency fTrimFor the frequency of the smallest unit, specifically the unit frequency f, when the oscillator operating frequency (i.e. the operating frequency) is corrected by the chip register corresponding to the radio transmitterTrimThe 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 fTrimThe 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 formulaOffsetThe frequency deviation value TrimOffsetWith actual oscillator frequency F of the oscillator of the radio transmitterosc_realAnd an oscillator set frequency F of the oscillator of the radio transmitterosc_setAccording to the unit frequency fTrimThe values are positively correlated. Specifically, according to the contents of the above embodiment, when the operating frequency F is setosc_set60MHz, oscillator actual frequency Fosc_real66MHz, predetermined unit frequency fTrimWhen it is 0.31MHz, the frequency deviation value Trim is calculated according to the above equation (9)OffsetComprises the following steps:
wherein, combining the above formula, the frequency deviation value TrimOffsetEssentially 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 transmitterosc_trimCorrected operating frequency F of radio transmitterreal(ii) a Further comprising: according to frequency deviation Trim of oscillatorOffsetObtaining an oscillator correction frequency F of an oscillatorosc_trimCorresponding to step S273 shown in fig. 4, the following formula (10) is satisfied:
Fosc_trim＝Fosc_real+TrimOffset×fTrim；
according to an embodiment of the invention, the correction frequency F of the oscillatorosc_trimAccording to the frequency deviation Trim of the oscillatorOffsetWith unit frequency f of the oscillatorTrimBy the product of the oscillator's actual frequency Fosc_realAnd (4) defining. Specifically, according to the contents of the above embodiment, when the oscillator actual frequency Fosc_real66MHz, predetermined unit frequency fTrim0.31MHz, frequency offset TrimOffsetWhen-19, the oscillator correction frequency F of the oscillator is in accordance with the above formula (10)osc_trimComprises the following steps:
therefore, the oscillator can deviate Trim according to the frequency of the oscillatorOffsetCompleting the correction of the running frequency of the oscillator with the oscillator correction frequency of Fosc_trim＝60.11MHz。
According to an embodiment of the invention, the target operating frequency F of the radio transmitter is determinedtargetAnd the oscillator correction frequency F of the oscillatorosc_trimObtaining a corrected operating frequency F of a radio transmitterrealCorresponding to step S274 shown in fig. 4, the following formula (11) is satisfied:
according to an embodiment of the present invention, the correction frequency F of the oscillator is obtainedosc_trimThen, based on the above equation (11), the corrected operating frequency F of the radio transmitter corresponding to the oscillator can be obtainedreal. In particular, according to the content of the above embodiments, when the target operating frequency F of the radio transmittertarget127.7kHz, the oscillator of which has a set frequency Fosc_set60MHz, the oscillator has an oscillator correction frequency of Fosc_trimAt 60.11MHz, the corrected operating frequency F of the corresponding radio transmitter is according to equation (11) aboverealComprises the following steps:
wherein the corrected operating frequency Freal127.93kHz is the corrected operating frequency F of the radio transmitter to be obtained by the embodiment of the present inventionreal. In particular, it can be seen from the above embodiments that the corrected operating frequency Freal127.93kHz and corresponding target operating frequency FtargetAlmost identical at 127.7 kHz.
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 partsrealHas important practical application value.
The present disclosure also provides a computer-readable storage medium, which may be contained in the apparatus/device/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 an 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 are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit 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 (10)
1. A method for correcting an operating frequency of a radio transmitter, comprising:
acquiring a test reception time interval CLK of a test signal transmitted by said radio transmittermeasuredAnd the set targetReceiving time interval CLKtargetThe deviation Error between;
obtaining the test reception time interval CLKmeasuredWith a target reception time interval CLKtargetAbsolute value of difference between CLKerror；
When the difference absolute value CLKerrorWhen 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 Errorreal(ii) a Or
Correcting the frequency F from the deviation Error and the oscillator of the radio transmitterosc_trimObtaining a corrected operating frequency F of said radio transmitterreal；
Wherein the preset Thd value is set according to an error range of an oscillator of the radio transmitter.
2. Method for correcting the operating frequency of a radio transmitter according to claim 1, characterized in that said test reception time interval CLK for obtaining a test signal transmitted by said radio transmittermeasuredWith a set target reception time interval CLKtargetA deviation Error between, including:
according to the test reception time interval CLKmeasuredWith a set target reception time interval CLKtargetThe deviation Error is obtained as the ratio between, which satisfies the following equation:
3. method for operating frequency correction of a radio transmitter according to claim 1, characterized in that said acquisition of said test reception time interval CLKmeasuredWith a target reception time interval CLKtargetAbsolute value of difference between CLKerrorThe method comprises the following steps:
according to the test reception time interval CLKmeasuredIs connected with a targetReceiving time interval CLKtargetObtaining the absolute value CLK of the differenceerrorIt satisfies the following formula:
CLKerror＝|CLKmeasured-CLKtarget|。
4. the method of claim 1, wherein the difference absolute value CLK is usederrorWhen the value is more than or equal to the preset Thd value, continuing to use
Obtaining a test successive reception time interval CLK of a successive test signal emitted by said radio transmittermeasured_nWith a set successive target receiving interval CLKtarget_nThe successive deviation Error _ n between; and
obtaining the test connection receiving time interval CLKmeasured_nAnd continuing the target reception interval CLKtarget_nAbsolute value of the difference between them CLKerror_n。
5. The method of claim 1, wherein said obtaining a corrected operating frequency F of said radio transmitter from said deviation Error is performedreal(ii) a The method comprises the following steps:
according to a target operating frequency F of the radio transmittertargetAnd said deviation Error, obtaining a set operating frequency F of said radio transmittersetIt satisfies the following formula:
6. the method of claim 5, wherein said obtaining a corrected operating frequency F of said radio transmitter from said deviation Error is performedreal(ii) a The method comprises the following steps:
according to a set operating frequency F of the radio transmittersetAnd said deviation Error, obtaining a corrected operating frequency F of said radio transmitterreal(ii) a It satisfies the following formula:
Freal＝Fset×Error。
7. the method of claim 1, wherein the correction frequency F is adjusted according to the deviation Error and the oscillator of the radio transmitterosc_trimCorrected operating frequency F of said radio transmitterreal(ii) a The method comprises the following steps:
according to the oscillator setting frequency F of the oscillator of the radio transmitterosc_setAnd said Error obtaining an oscillator actual frequency F of an oscillator of said radio transmitterosc_realThe following formula is satisfied:
Fosc_real＝Fosc_set×Error。
8. the method of claim 7, wherein the correction frequency F is adjusted according to the deviation Error and the oscillator of the radio transmitterosc_trimCorrected operating frequency F of said radio transmitterreal(ii) a Further comprising:
according to the actual oscillator frequency F of the oscillator of the radio transmitterosc_realAnd an oscillator set frequency F of an oscillator of the radio transmitterosc_setObtaining a frequency deviation Trim of the oscillatorOffsetThe following formula is satisfied:
wherein, the fTrimIs the unit frequency of the oscillator.
9. The method of claim 8, wherein the operating frequency correction is based onSaid deviation Error and an oscillator correction frequency F of said radio transmitterosc_trimCorrected operating frequency F of said radio transmitterreal(ii) a Further comprising:
according to the frequency deviation Trim of the oscillatorOffsetObtaining an oscillator correction frequency F of the oscillatorosc_trimThe following formula is satisfied:
Fosc_trim＝Fosc_real+TrimOffset×fTrim；
according to a target operating frequency F of the radio transmittertargetAnd an oscillator correction frequency F of said oscillatorosc_trimObtaining a corrected operating frequency F of said radio transmitterrealThe following formula is satisfied:
10. 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 9.
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