CN103686968A - Calibration method and calibration circuit for transmitted power of digital microwave transceiver - Google Patents
Calibration method and calibration circuit for transmitted power of digital microwave transceiver Download PDFInfo
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Abstract
The invention discloses a calibration method for the transmitted power of a digital microwave transceiver. The calibration method comprises the following steps of first generating a transmitted power calibration table according to transmitted power control voltages and actual radio frequency transmitted power which corresponds to the transmitted power control voltages and is transmitted by the microwave transceiver, second generating a channel calibration table, and thirdly correcting the transmitted power control voltage value in the transmitted power calibration table by using a channel correcting method. The invention further discloses a calibration circuit for achieving the calibration method for the transmitted power of the digital microwave transceiver. The calibration circuit comprises a microwave unit and a monitoring unit, and the microwave unit comprises a first power detection tube, a second power detection tube, a microwave amplifier and a microwave attenuator. The calibration circuit has the advantages of being high in batch production efficiency, high in calibration rate, high in transmitted power stability, simple in calibration method and the like.
Description
Technical field
The present invention relates to a kind of microwave radio technology, particularly a kind of transmission power calibration method and calibration circuit thereof of digital microwave transceiver, the present invention is applicable to 5-42G digital microwave transceiver.
Background technology
The transmitter section of digital microwave transceiver (radio frequency unit) is generally comprised of a plurality of amplifiers, frequency mixer, filter, attenuator, because the consistency of microwave device is poor, temperature influence is larger, cause whole transmitting chain gain unstable, affect the precision (being that transmitter real output and default definite value deviation are larger) of output power of transmitter; Along with communications industry development, the operating frequency of digital microwave transceiver is more and more higher, its passband is more and more wider, in wide frequency ranges like this, the performance difference of device under different frequency highlights, make the final power output of transmitter be not easy to control, in different tranmitting frequency situations, transmitting power deviation is very large.
For solving the difficult point of above two major effect transmitter transmitting power precision properties, in prior art, adopt normal temperature, high temperature, low temperature to calibrate respectively more, and the method for multifrequency point calibration, production difficulty is large, and cost is higher, is unfavorable for extensive utilization and popularization.
Summary of the invention
Primary and foremost purpose of the present invention is that the shortcoming that overcomes prior art is with not enough, a kind of transmission power calibration method of digital microwave transceiver is proposed, the method coordinates by software and hardware, only by the disposable calibration of normal temperature, realized under high temperature, low temperature environment, and in all-pass frequency band range, the high accuracy of transmitting power is controlled.
The shortcoming that another object of the present invention is to overcome prior art is with not enough, propose a kind of calibration circuit of realizing digital microwave transceiver transmission power calibration method, this circuit structure is simple, easy to operate, be easy to realize, greatly degree has reduced production debugging work load.
Primary and foremost purpose of the present invention is achieved through the following technical solutions:
A transmission power calibration method for digital microwave transceiver, comprises the following steps:
Step 1, according to transmitting power, control the actual radio frequency power output that voltage and transmitting power are controlled the corresponding microwave transmitting and receiving equipment transmitting of voltage, generate transmission power calibration form: under normal temperature environment, it is intermediate-frequeney point that digital microwave transceiver tranmitting frequency is set, and digital microwave transceiver is carried out to transmission power calibration.Calibration software is controlled the MCU output transmitting power of microwave transmitting and receiving equipment and is controlled voltage V
rFctrl, be initially 0V, by power meter, detect the actual radio frequency power output of digital microwave transceiver, and with corresponding V
rFctrlmagnitude of voltage records formation form together.
Transmitting power is controlled voltage V
rFctrltake 0.02V as stepping, and from be increased to+5V of 0V, voltage V is controlled in each stepping of readout power meter read-record
rFctrltime corresponding microwave transmitting and receiving equipment actual radio frequency transmitting power (totally 256 piece of data), generate transmission power calibration form (table 1);
Step 2, set in advance transmission power level, by adjusting transmitting power, control voltage, the transmission power level that the actual radio frequency output power value that digital microwave transceiver is launched equals to set in advance, and control voltage generation calibrate form according to the transmitting power after adjusting: under normal temperature environment, it is equipment lowest frequency points that digital microwave transceiver tranmitting frequency is set, and it is 15dBm that transmitting power is set.Due to the frequency characteristic reason of device, now the actual radio frequency power output of digital microwave transceiver and 15dBm have certain deviation, adjust transmitting power and control voltage V
rFctrl, making actual radio frequency power output is 15dBm, records this magnitude of voltage.Tranmitting frequency be take 8MHz and is increased to gradually the highest frequency point of equipment as stepping, under each step frequency point, adjust transmitting power and control voltage, all actual radio frequency power output is 15dBm, and recording each channel position (being which stepping point) and making actual radio frequency power output to should step frequency point time is the V of 15dBm
rFctrlmagnitude of voltage, generates calibrate form (table 2);
Step 3, employing passage modification method, the transmitting power of revising in transmission power calibration form is controlled magnitude of voltage; Use passage correction algorithm, the transmitting power under different channel frequences is arranged to voltage correction.The variation of magnitude of voltage in calibration, has reacted each device frequency characteristic impact on radio-frequency emission power of digital microwave transceiver.In passband is set, during a certain tranmitting frequency, MCU is according to voltage value record in calibrate form (table 2), the difference of comparison calibration frequency of utilization (intermediate-frequeney point) respective channel calibration voltage, and then transmission power calibration table voltage V in correction chart 1
rFctrlsettings, realize all-pass frequency band range transmitting power precision and control.
The transmission power calibration software execute process of described step 1 comprises the steps:
(I) arranges V
rFctrlfor 0V;
(II) reads transmitting power by power meter;
（Ⅲ）V
RFctrl=V
RFctrl+0.02；
(IV) reads transmitting power by power meter;
(V) is if V
rFctrl<5 forwards (III) step to;
(VI) generating power correction card.
The calibrate software execute process of described step 2 comprises the steps:
(I) arranges the minimum tranmitting frequency of Tx_Freq;
(II) adjusts V
rFctrlmaking transmitting power is 15dBm;
（ⅲ）Tx_Freq=Tx_Freq+8MHz；
(IV) adjusts V
rFctrlmaking transmitting power is 15dBm;
(V) is if Tx_Freq< emission maximum frequency forwards (III) step to;
(VI) generates calibrate form.
Passage modification method in described step 3 comprises the following steps:
(3-1) during a tranmitting frequency in passband is set, microwave transmitting and receiving equipment is according to the magnitude of voltage in tranmitting frequency channel position fetch channel of living in correction card, and compares with the intermediate-frequeney point gained respective channel calibration voltage of calibration, draws voltage differences;
(3-2) utilize the described voltage differences of step (3-1), and according to passage correction algorithm, the transmitting power of revising in transmission power calibration table is controlled magnitude of voltage, the expression formula of described passage correction algorithm is as follows:
Wherein, V
rFctrlthe transmitting power that represents the MCU output in microwave transmitting and receiving equipment is controlled voltage, V
calrepresent that in transmission power calibration form, transmitting power corresponding to transmitting power controlled voltage, V
chrepresent calibrate voltage corresponding to tranmitting frequency in calibrate form, V
mthe corresponding calibrate voltage of intermediate-frequeney point that represents transmission power calibration in calibrate form.
Described step 1 comprises the following steps:
(1-1) tranmitting frequency that digital microwave transceiver is set is intermediate-frequeney point, and the initial value that the transmitting power that digital microwave transceiver is set is controlled voltage is 0V;
(1-2) power meter detects the actual radio frequency power output of each stepping of digital microwave transceiver, and control voltage according to this actual radio frequency power output with the transmitting power corresponding with this actual radio frequency power output, generate actual radio frequency power output and control voltage calibration data pair with the transmitting power corresponding with this actual radio frequency power output;
(1-3) magnitude of voltage of this increase of the transmitting power of digital microwave transceiver control voltage increase 0.02V(is only example, other similar stepping as 0.01V, 0.4V, 0.5V etc. be also a kind of in the specific implementation of the method, all in protection scope of the present invention);
(1-4) power meter detects the actual radio frequency power output of each stepping of digital microwave transceiver again, according to this actual radio frequency power output, control voltage with the transmitting power corresponding with this actual radio frequency power output, the actual radio frequency power output after generation transmitting power control voltage increase 0.02V and the transmitting power corresponding with this actual radio frequency power output are controlled voltage calibration data pair;
(1-5) transmitting power that judges digital microwave transceiver is controlled voltage and whether is less than 5V, if transmitting power is controlled voltage, is less than 5V, and repeated execution of steps (1-3) is to step (1-5), otherwise, execution step (1-6);
(1-6) read step (1-2) to the middle actual radio frequency power output generating of step (1-4) and the transmitting power corresponding with this actual radio frequency power output controlled the right value of voltage calibration data, generate transmission power calibration form, according to transmission power calibration form, digital microwave transceiver is carried out to transmission power calibration.
Described step 2 comprises the following steps:
(2-1) tranmitting frequency that digital microwave transceiver is set is low frequency, and transmitting power is set is that the transmitting power of this setting of 15dBm(is only for example, other similar power as 10dBm, 20dBm etc. be also a kind of in the specific implementation of the method, all in protection scope of the present invention);
(2-2) when the actual radio frequency power output of digital microwave transceiver is greater than or less than 15dBm, adjust transmitting power and control voltage until the actual radio frequency power output of digital microwave transceiver equals 15dBm, and the transmitting power of the actual radio frequency power output that records digital microwave transceiver while equaling 15dBm controlled magnitude of voltage;
(2-3) from low frequency, to take this frequency values of 8MHz(be only example to tranmitting frequency; other similar stepping as 5MHz, 10MHz etc. be also a kind of in the specific implementation of the method; all in protection scope of the present invention) be increased to high frequency points for stepping; under each step frequency point; adjust a transmitting power and control voltage; make each actual radio frequency power output be 15dBm; and according to each stepping point of record and to make actual radio frequency power output during corresponding to this step frequency point be the transmitting power control magnitude of voltage of 15dBm, generation calibrate form.
Another object of the present invention is achieved through the following technical solutions: a kind of calibration circuit of realizing the transmission power calibration method of described digital microwave transceiver, comprise microwave unit and monitoring unit, described microwave unit comprises the first power detection pipe, the second power detection pipe, microwave amplifier and microwave attenuator, described the first power detection pipe and the second power detection pipe are arranged in identical temperature environment, and described monitoring unit comprises integrating network, linear regulation circuit, power control circuit and differential amplifier circuit; Described microwave attenuator, microwave amplifier, the first power detection pipe, differential amplifier circuit, linear regulation circuit are connected successively with integrating network, and integrating network is connected with microwave attenuator, make microwave attenuator, microwave amplifier, the first power detection pipe, differential amplifier circuit, linear regulation circuit and integrating network form a close loop control circuit, described the second power detection pipe is connected with differential amplifier circuit, and described power control circuit is connected with integrating network.
Transmit from described microwave attenuator input, the microwave amplifier of flowing through, and from the first power detection pipe output, described the first power detection pipe is the first detecting circuit for detection of the watt level transmitting the power transfer transmitting detecting of transmitting chain, and the first detecting circuit is fed back to differential amplifier circuit, differential amplifier circuit gathers the second detecting circuit on the second power detection pipe, the output voltage of described differential amplifier circuit is the poor of the first detecting circuit and the second detecting circuit, the output voltage of described differential amplifier circuit has been eliminated the impact of temperature on the second detecting circuit on the basis of the first detecting circuit, the output voltage of described differential amplifier circuit is the final detecting circuit transmitting, described detecting circuit through linear regulation circuit carry out linearity adjust after with power control circuit acting in conjunction in regulation and control integrating network, described integrating network output voltage control microwave attenuator, with the transmit signal power of control inputs microwave amplifier, form the closed-loop control of the power transmitting.
Being described in detail as follows of technical scheme:
A transmission power calibration method for digital microwave transceiver, comprises the following steps:
Step 1, the normal temperature intermediate-frequeney point calibration of power: under normal temperature environment, it is intermediate-frequeney point that digital microwave transceiver tranmitting frequency is set, and digital microwave transceiver is carried out to transmission power calibration.Calibration software is controlled the MCU output transmitting power of microwave transmitting and receiving equipment and is controlled voltage V
rFctrl, be initially 0V, by power meter, detect the actual radio frequency power output of digital microwave transceiver, and with corresponding V
rFctrlmagnitude of voltage records formation form together; Transmitting power is controlled voltage V
rFctrltake 0.02V as stepping, and from be increased to+5V of 0V, voltage corresponding microwave transmitting and receiving equipment actual radio frequency transmitting power (totally 256 piece of data) is controlled in each stepping of readout power meter read-record, generates transmission power calibration form (table 1);
Step 2, calibrate: under normal temperature environment, it is equipment lowest frequency points that digital microwave transceiver tranmitting frequency is set, it is 15dBm that transmitting power is set; Due to the frequency characteristic reason of device, now the actual radio frequency power output of digital microwave transceiver and 15dBm have certain deviation, adjust transmitting power and control voltage V
rFctrl, making actual radio frequency power output is 15dBm, records this magnitude of voltage; Tranmitting frequency be take 8MHz and is increased to gradually the highest frequency point of equipment as stepping, under each step frequency point, adjust transmitting power and control voltage, all actual radio frequency power output is 15dBm, and recording each channel position (being which stepping point) and making actual radio frequency power output to should step frequency point time is the V of 15dBm
rFctrlmagnitude of voltage, generates calibrate form (table 2);
Passage correction algorithm when step 3, transmitting power arrange: use passage correction algorithm, the transmitting power under different channel frequences is arranged to voltage correction.The variation of magnitude of voltage in calibration, has reacted each device frequency characteristic impact on radio-frequency emission power of digital microwave transceiver.In passband is set, during a certain tranmitting frequency, MCU is according to voltage value record in calibrate form (table 2), the difference of comparison calibration frequency of utilization (intermediate-frequeney point) respective channel calibration voltage, and then transmission power calibration table voltage V in correction chart 1
rFctrlsettings, realize all-pass frequency band range transmitting power precision and control.
Realize a calibration circuit for digital microwave transceiver transmission power calibration method, temperature-compensating closed control circuit, comprising: the radio frequency power controlling circuit of monitoring unit, the microwave attenuator in microwave unit and power detection circuit.
1, the normal temperature calibration of power;
Under normal temperature environment, it is intermediate-frequeney point that digital microwave transceiver tranmitting frequency is set, and digital microwave transceiver is carried out to transmission power calibration.The transmitting power of digital microwave transceiver is controlled by microwave attenuator and is realized (as the ATT2 in Fig. 3), controls voltage V
rFctrlscope be 0V～+ 5V(or-5V～0V looks different model microwave attenuator and determines), the attenuation of microwave attenuator is with magnitude of voltage linear change, by MCU chip controls V
rFctrlexport different voltage, by microwave attenuator ATT2, realize transmitting power and control.V
rFctrltake 0.02V as stepping, from change to+5V of 0V, by power meter, detect the radiofrequency signal power of digital microwave transceiver transmitting terminal, the different voltage V that control of record
rFctrltime corresponding actual emission power, generate calibration data form, as shown in table 1, be transmission power calibration form.
Table 1
As shown in table 1, data store in the memory of digital microwave transceiver, and when a certain transmitting power is set, MCU obtains corresponding V by tabling look-up
rFctrlmagnitude of voltage, output transmitting power is controlled voltage, realizes digital microwave transceiver actual emission power consistent with settings.
2, calibrate technology;
Table 2
In order to overcome digital microwave transceiver when the different tranmitting frequency, the problem that transmitting power deviation is large, the present invention is in each microwave device Investigation on frequency characteristics data, and on the basis of thousands of digital microwave transceiver comprehensive datas statistical analysis, unique proposition choose the method that one of them power carries out calibrate.Because device frequency characteristic is consistent when the different power, digital microwave transceiver power control bits in equipment by final stage position, when particular transmit frequency, consistent for the impact of different transmission power.After choosing a certain tranmitting frequency (as the intermediate-frequeney point of the 1st) transmitting power being calibrated, the increase of novelty of the present invention the method for calibrate, realize all-pass frequency band range transmitting power precision and control.It is a certain particular value (selecting middle power 15dBm here) that digital microwave transceiver transmitting power is set, and with certain step frequency (selecting 8MHz here), all-pass frequency band is carried out to sweep check.The difference of calibrate and transmission power calibration as shown in Figure 5, the contacting as shown in Figure 6 of calibrate and transmission power calibration.Due to device frequency characteristic, under different passages, the actual radio frequency power output of digital microwave transceiver and 15dBm deposit certain deviation, need to adjust transmitting power and control voltage V
rFctrl, making digital microwave transceiver actual emission power is 15dBm, recording and making digital microwave transceiver real output under this channel position and this passage is the V of 15dBm
rFctrlmagnitude of voltage.Tranmitting frequency be take 8MHz and is increased to gradually the highest frequency point of equipment as stepping, under each step frequency point, adjust transmitting power and control voltage, all actual radio frequency power output is 15dBm, and recording each channel position (being which stepping point) and making actual radio frequency power output to should step frequency point time is the V of 15dBm
rFctrlmagnitude of voltage, generates calibrate form, stores in the memory of digital microwave transceiver, and the calibrate form of digital microwave transceiver is as shown in table 2.
3, passage correction algorithm;
The variation of magnitude of voltage in calibrate table, has reacted each device frequency characteristic impact on transmitting power of digital microwave transceiver.In passband is set during a certain tranmitting frequency, MCU is according to voltage value record in calibrate form, the difference of comparison calibration frequency of utilization (intermediate-frequeney point) respective channel calibration voltage, and then transmission power calibration table voltage V in correction chart 1
rFctrlsettings, realize all-pass frequency band range transmitting power precision and control.
The expression formula of passage correction algorithm is as follows:
In formula, V
rFctrlrepresent MCU output transmitting power control voltage, V
calrepresent that in transmission power calibration form (table 1), transmitting power corresponding to transmitting power controlled voltage, V
chrepresent in calibrate form (table 2) the calibrate voltage that tranmitting frequency is corresponding, V
mrepresent in calibrate form (table 2) the calibrate voltage that transmission power calibration frequency of utilization (intermediate-frequeney point) is corresponding.
4, temperature-compensating closed control circuit;
Digital microwave transceiver is outdoor equipment, its operating ambient temperature requires as-33 ℃ to+55 ℃, for ensureing that digital microwave transceiver is at the transmitting power precision of whole temperature range temperature influence not, the common practices of industry is: at normal temperature, carry out primary calibration, under low temperature-33 ℃ and high temperature+55 ℃ environment, each calibration is once respectively again, form three parts of transmission power calibration forms, then, by monitoring transmitter internal temperature, calculate V under corresponding temperature
rFctrlmagnitude of voltage.This kind of calibration steps use equipment is many, and the alignment time is long, and incubator heats up, cooling all needs the time, and recalibration 3 times, and internal storage takes up room many, is unfavorable for producing in enormous quantities and follow-up code upgrade.
The use of the property of the present invention is directed to " temperature-compensating closed control circuit scheme ", by hardware circuit, the impact of compensation temperature on microwave device, consistent when the transmitting power of digital microwave transceiver in whole operating temperature range calibrated with normal temperature.
Be illustrated in figure 4 the physical circuit of temperature-compensating closed control circuit, the radio frequency power controlling circuit that comprises monitoring unit, the microwave attenuator in microwave unit and power detection circuit, its feature is as follows:
Detecting circuit adopts power detection pipe, its voltage swing feedback radio-frequency power size.The position nearby of the novelty on traditional single power detection pipe basis of the detecting circuit in the present invention increases an identical power detection pipe, wherein the first power detection pipe is arranged in transmitting chain path, its feedback voltage directly reflects transmitting chain performance number, the second power detection pipe is not in transmitting chain path, its position is positioned near the first power detection pipe, therefore two power detection pipe temperature are consistent during product work.
A) two identical power detection pipes of employing of novelty of the present invention, because two power detection tube device models are consistent, position approaches, and working temperature is consistent, and temperature is consistent on device impact.The second acting as of power detection pipe is embodied in: pass through differential amplifier circuit, calculate the difference of two power detection pipe feedback voltages, can eliminate the impact of temperature on the first power detection pipe, its output voltage values has directly reacted watt level, and composition detection tube device being affected without temperature.
B) after detecting circuit is adjusted by amplification, linearity, react on integrating network with the power control circuit one of MCU, integrating network output voltage control microwave attenuator, transmit power variation, then detecting circuit effect feedback voltage changes, and forms closed control circuit, due to the characteristic of hardware circuit, this closed control circuit reaction time is short, can control in real time transmitting power.Transmission power calibration only need to be calibrated at normal temperature, just can guarantee that under each temperature environment, output power of transmitter is normal, and need not calibration respectively under high low temperature.
Operation principle of the present invention: digital microwave transceiver is outside work unit, need to adapt to-33 ℃ to+55 ℃ temperature environments, microwave device particularly amplifier characteristic temperature influence is larger, cause digital microwave transceiver link gain under different temperatures wayward, transmitting power output is unstable.And along with communications industry development, the operating frequency of digital microwave transceiver is more and more higher, its passband is more and more wider, in wide frequency ranges like this, the performance difference of device under different frequency highlights, make the final power output of transmitter be not easy to control, when different tranmitting frequency, transmitting power deviation is larger.The transmitting power output of digital microwave transceiver is affected by temperature and two principal elements of frequency, the proposition of the property of the present invention is directed to temperature-compensating closed control circuit and calibrate technology, its operation principle is: 1, temperature-compensating closed control circuit.By two duplicate power detection pipes, one of them on transmitting chain for detection of signal power, another be positioned near position but not on transmitting chain, two power detection pipe temperature are consistent, by differential amplifier, the voltage of two power detection pipes is subtracted each other, eliminated the impact of temperature on power detection tube device, detecting circuit value has directly been reacted signal power size, without temperature, affects composition.Detecting circuit is after amplification, linear adjustment, react on integrating network with the power control circuit one of MCU, integrating network output voltage control microwave attenuator, transmit power variation, then detecting circuit effect feedback voltage changes, form closed control circuit, this closed control circuit reaction time is short, controls in real time transmitting power.Transmission power calibration only need to be calibrated at normal temperature, just can guarantee that under each temperature environment, output power of transmitter is normal, and need not calibration respectively under high low temperature.2, calibrate technology.It is a certain particular value (as 15dBm) that transmitter transmitting power is set, and with certain step frequency (as 8MHz), all-pass frequency band is carried out to sweep check.By continuous adjustment transmitting power, control voltage V
rFctrl, make actual emission power of transmitter approach 15dBm, and record this magnitude of voltage, form correction card, be transmitter channels correction card, store in the memory of transmitter.The variation of magnitude of voltage in calibration, has reacted each device frequency characteristic impact on transmitting power of transmitter.In passband is set during a certain tranmitting frequency, MCU is according to records of values in passage calibration, contrast transmission power calibration table value difference, and then correction chart 1 transmitting power calibration voltage V
rFctrlsettings, realize all-pass frequency band range transmitting power precision and control.Only need to increase calibrate one time, just can ensure that transmitting power is controlled in all-pass frequency band range power precision.Comprehensive above 2 points, the transmitting power of digital microwave transceiver is only controlled and need to be carried out a calibration of power and a calibrate just can be realized-33 ℃ to+55 ℃ of temperature environments and the required precisions of whole passband transmitting power at normal temperature environment, and without high low temperature calibrate respectively with frequency band in multiple spot calibrate.Used time is few, and operating process is simple, easily realizes in batches.
The present invention is by the temperature-compensating closed loop circuit on software and hardware and two methods of calibrate technology, only realized and need to carry out a normal calibration and a calibrate at normal temperature, just can realize the transmitting power of full temperature scope and all-pass frequency band range controls, and do not need the many temperature spots of full temperature scope to calibrate respectively, do not calibrate respectively with passband multifrequency point, efficiently solve the impact that solves temperature impact and wide frequency ranges device deviation.
The present invention has following advantage and effect with respect to prior art:
1, the present invention has realized the transmitting power that makes digital microwave transceiver and only need to carry out a calibration of power and a calibrate just can be realized-33 ℃ to+55 ℃ of temperature environments and the required precisions of whole passband transmitting power at normal temperature environment, and without high low temperature calibrate respectively with frequency band in multiple spot calibration, method simple and feasible, improved batch production efficiency, reduced memory headroom and take.
2, the present invention is by the power detection pipe of a newly-increased same model, in its placement location and radio frequency link, power detection pipe approaches, by calculating the difference of two detection tube output voltages, eliminate the impact of temperature on its device detection performance, realize transmitting power within the scope of full temperature and control.Implementation method hardware circuit is simple, and easily realization and cost are lower, can greatly improve calibration efficiency.
3, the closed control circuit of serviceability temperature compensation of the present invention, power detection acts on the microwave attenuator of power ratio control size after amplification, linear adjustment, microwave attenuator power ratio control size directly affects detection tube voltage, so form closed loop circuit, use analog circuit realize its feature for the reaction time short, power ratio control, improves output power stability in real time.
4, the present invention is on legacy transmission calibration of power basis, the increase frequency sweep calibrate of novelty, for a certain power points, carry out the test of all-pass frequency band, according to frequency, carry out again the scheme of software correction, calibration steps is simple, need not increase testing equipment and hardware circuit, just can realize all-pass frequency band range transmitting power and control.
Accompanying drawing explanation
Fig. 1 is digital microwave transceiver main modular block diagram.
When Fig. 2 is transmission power calibration for the connection layout of the instrument and equipment of transmission power calibration.
Fig. 3 is transmitting chain control function of power module diagram.
Fig. 4 is temperature-compensating closed control circuit schematic diagram.
Fig. 5 is transmitter channels calibration schematic diagram.
Fig. 6 is transmitter channels calibration and transmission power calibration relation schematic diagram.
Fig. 7 is the schematic flow sheet of digital microwave transceiver transmission power calibration method.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not limited to this.
Embodiment
As shown in Figure 1, be digital microwave transceiver main modular block diagram, digital microwave transceiver comprises intermediate frequency unit, microwave unit, monitoring unit, receiver and cavity body filter.Intermediate frequency unit comprises intermediate frequency power control circuit, mixting circuit and filter amplification circuit etc., to intermediate-freuqncy signal amplify, filtering, a up-conversion, and provide the signal of power stability to microwave unit (as shown in Figure 3); Microwave unit comprises detecting circuit, microwave attenuator, mixting circuit and filter amplification circuit etc., microwave unit carries out secondary up-conversion, filtering to transmitting, and amplify again, output radiofrequency signal (5-42G), coordinates radio frequency power controlling circuit to realize radio-frequency power size and controls (as shown in Figure 3); Monitoring unit comprises intermediate frequency power control circuit, radio frequency power controlling circuit etc., by MCU, transmitting power is controlled, and coordinates microwave module to form the closed loop circuit (as shown in Figure 3) that radio-frequency power is controlled automatically; Receiver detail does not embody in the drawings, and it act as received RF signal is carried out to down-conversion, amplify, and filtering, it also comprises AGC(automatic gain and controls) and circuit, the intermediate-freuqncy signal of stable output power; Cavity body filter carries out filtering to emitting radio frequency signal, and the outer spurious signal of inhibition zone sends to free space, and digital microwave transceiver has receiving function simultaneously, and cavity body filter also has and transmits, receives the separated Ji He of signal road function.
The intermediate frequency unit of digital microwave transceiver, microwave unit, by devices such as a plurality of amplifiers, frequency mixer, filter, attenuators, formed, inconsistency due to microwave device, whole transmitting chain gain is unstable, affect output power of transmitter precision index, therefore be necessary sender to carry out the calibration of power.
The whole transmitting chain block diagram of the digital microwave transceiver forming for monitoring unit, intermediate frequency unit, microwave unit as shown in Figure 3.The intermediate frequency power control circuit of monitoring unit coordinates with intermediate frequency unit, makes intermediate frequency unit stable output power, and the radio frequency power controlling circuit in monitoring unit coordinates with microwave unit, the radio frequency power output of control figure microwave transmitting and receiving equipment.The latter in the present invention (radio frequency power controlling circuit in monitoring unit and microwave unit) plays a major role.MCU produces certain voltage value by radio frequency power controlling circuit, and the microwave attenuator (ATT2) that acts on microwave unit is realized the control of digital microwave transceiver radio frequency power output.The power detection pipe that is positioned at whole transmitting chain final stage in microwave unit carries out detection to digital microwave transceiver radio frequency power output and is converted into magnitude of voltage feedback MCU processing, MCU, according to the magnitude of voltage of power detection pipe feedback, adjusts transmitting power and controls voltage V
rFctrl, remake the radio frequency power output for microwave attenuator ATT2 control figure microwave transmitting and receiving equipment, realize from closed loop, make stable output power.
As shown in Figure 2, for digital microwave transceiver being carried out to the connection layout of the instrument and equipment of transmission power calibration, it is consistent that the instrument and equipment of the calibration of power and calibrate is connected block diagram.Intermediate-freuqncy signal source provides intermediate-freuqncy signal for digital microwave transceiver; Power meter detects digital microwave transceiver output signal and feeds back to computer; Computer software passes through the power output of control figure microwave transmitting and receiving equipment, and contrasts processing with the actual power value size that power meter detects, and exports the data table of comparisons 1 or table 2, is stored in the memory of digital microwave transceiver.
As shown in Figure 4, for microwave temperature-compensating closed control circuit, the first power detection pipe is connected in the transmitting path with radio signal transmission, the second power detection pipe is the device identical with the first power detection tube device model, its position is near the first power detection pipe, make the second power detection pipe identical with the residing temperature environment of the first power detection pipe, but be free of attachment in transmitting path, so that two power detection pipe temperature are consistent.By differential amplifier circuit, calculate the difference of two power detection pipe feedback voltages, can eliminate the impact of temperature on the first power detection pipe, its output voltage values has directly reacted watt level, and composition detection tube device being affected without temperature.After detecting circuit is adjusted by amplification, linearity, react on integrating network with the power control circuit one of MCU, integrating network output voltage control microwave attenuator, when transmitting power changes, detecting circuit effect feedback voltage changes, and forms closed control circuit.
As shown in Figure 5, be digital microwave transceiver transmission power calibration and calibrate software execution step schematic diagram.
1). during transmission power calibration, first transmitting power is set and controls voltage V
rFctrlfor 0V, the attenuation of microwave attenuator ATT2 is minimum, and the stepping of concurrent 0.02V progressively increases V
rFctrlmagnitude of voltage, stops until voltage reaches 5V, records the V of each stepping point
rFctrlmagnitude of voltage and actual radio frequency power output, generate transmission power calibration form (table 1).
2). during calibrate, first tranmitting frequency is set is minimum tranmitting frequency, adjusts V
rFctrlmaking transmitting power is 15dBm, take 8MHz as stepping increases tranmitting frequency, and the channel number that records each stepping point is the V of 15dBm with making transmitting power
rFctrlvalue generates calibrate form (that is: table 2).
As shown in Figure 6, shown relation and the difference of the calibrate of the calibration of power, the longitudinal axis represents the calibration of power, and transmitting power is controlled voltage V
rFctrltake 0.02V as stepping, record actual radio frequency power output generating power correction card (table 1); Transverse axis represents calibrate, and selection 15dBm is datum mark, and transmitting power be take 8MHz as stepping, travels through whole frequency range, and recording each passage, to make radio frequency power output be the V of 15dBm
rFctrl, generate calibrate form (table 2).By these two axial data, and passage correction algorithm, can realize calibration and the precision of full tunnel scope and total power point and control.
As shown in Figure 7, be the schematic flow sheet of digital microwave transceiver transmission power calibration method.First in the middle of arranging, frequency carries out transmission power calibration, V under normal temperature environment
rFctrltake 0.02V as stepping by 0 to 5V, record the actual radio frequency power output of digital microwave transceiver under each stepping, generate transmission power calibration form (table 1), then tranmitting frequency is set is low frequency, transmitting power is 15dBm, adjusts V
rFctrlit is 15dBm that voltage makes actual radio frequency power output, and tranmitting frequency be take 8MHz as the high frequency points of stepping from low frequency to equipment, and recording each step frequency point, to make radio frequency power output be the V of 15dBm
rFctrlgenerate calibrate form (table 2).By two correction card data, use passage correction algorithm, can realize total power point, the control of full tunnel range radio frequency transmitting power precision.By temperature-compensating closed control circuit, eliminate the impact of temperature on detection data, can realize the precision of radio-frequency emission power within the scope of full temperature and control.
Above-described embodiment is preferably execution mode of the present invention; but embodiments of the present invention are not restricted to the described embodiments; other any do not deviate from change, the modification done under Spirit Essence of the present invention and principle, substitutes, combination, simplify; all should be equivalent substitute mode, within being all included in protection scope of the present invention.
Claims (9)
1. a transmission power calibration method for digital microwave transceiver, is characterized in that, comprises the following steps:
Step 1, according to transmitting power, control the actual radio frequency power output that voltage and transmitting power are controlled the corresponding microwave transmitting and receiving equipment transmitting of voltage, generate transmission power calibration form;
Step 2, set in advance transmission power level, by adjusting transmitting power, control voltage, the transmission power level that the actual radio frequency output power value that digital microwave transceiver is launched equals to set in advance, and control voltage generation calibrate form according to the transmitting power after adjusting;
Step 3, employing passage modification method, the transmitting power of revising in transmission power calibration form is controlled magnitude of voltage.
2. the transmission power calibration method of digital microwave transceiver according to claim 1, is characterized in that, the passage modification method in described step 3 comprises the following steps:
(3-1) during a tranmitting frequency in passband is set, microwave transmitting and receiving equipment is according to the magnitude of voltage in tranmitting frequency channel position fetch channel of living in correction card, and compares with the intermediate-frequeney point gained respective channel calibration voltage of calibration, draws voltage differences;
(3-2) utilize the described voltage differences of step (3-1), and according to passage correction algorithm, the transmitting power of revising in transmission power calibration table is controlled magnitude of voltage, the expression formula of described passage correction algorithm is as follows:
Wherein, V
rFctrlthe transmitting power that represents the MCU output in microwave transmitting and receiving equipment is controlled voltage, V
calrepresent that in transmission power calibration form, transmitting power corresponding to transmitting power controlled voltage, V
chrepresent calibrate voltage corresponding to tranmitting frequency in calibrate form, V
mthe corresponding calibrate voltage of intermediate-frequeney point that represents transmission power calibration in calibrate form.
3. the transmission power calibration method of digital microwave transceiver according to claim 1, is characterized in that, described step 1 comprises the following steps:
(1-1) tranmitting frequency that digital microwave transceiver is set is intermediate-frequeney point, and the initial value that the transmitting power that digital microwave transceiver is set is controlled voltage is 0V;
(1-2) power meter detects the actual radio frequency power output of each stepping of digital microwave transceiver, and control voltage according to this actual radio frequency power output with the transmitting power corresponding with this actual radio frequency power output, generate actual radio frequency power output and control voltage calibration data pair with the transmitting power corresponding with this actual radio frequency power output;
(1-3) transmitting power of digital microwave transceiver is controlled the magnitude of voltage that voltage increases a setting;
(1-4) power meter detects the actual radio frequency power output of each stepping of digital microwave transceiver again, according to this actual radio frequency power output, control voltage with the transmitting power corresponding with this actual radio frequency power output, the actual radio frequency power output after generation transmitting power control voltage increase 0.02V and the transmitting power corresponding with this actual radio frequency power output are controlled voltage calibration data pair;
(1-5) transmitting power that judges digital microwave transceiver is controlled voltage and whether is less than 5V, if transmitting power is controlled voltage, is less than 5V, and repeated execution of steps (1-3) is to step (1-5), otherwise, execution step (1-6);
(1-6) read step (1-2) to the middle actual radio frequency power output generating of step (1-4) and the transmitting power corresponding with this actual radio frequency power output controlled the right value of voltage calibration data, generate transmission power calibration form, according to transmission power calibration form, digital microwave transceiver is carried out to transmission power calibration.
4. the transmission power calibration method of digital microwave transceiver according to claim 1, is characterized in that, described step 2 comprises the following steps:
(2-1) tranmitting frequency that digital microwave transceiver is set is low frequency, and the performance number 15dBm that transmitting power is a setting is set;
(2-2) when the actual radio frequency power output of digital microwave transceiver is greater than or less than 15dBm, adjust transmitting power and control voltage until the actual radio frequency power output of digital microwave transceiver equals 15dBm, and the transmitting power of the actual radio frequency power output that records digital microwave transceiver while equaling 15dBm controlled magnitude of voltage;
(2-3) tranmitting frequency be take the step value of a setting from low frequency and is increased to high frequency points as stepping, under each step frequency point, adjust a transmitting power and control voltage, make each actual radio frequency power output be 15dBm, and according to each stepping point of record and to make actual radio frequency power output during corresponding to this step frequency point be the transmitting power control magnitude of voltage of 15dBm, generation calibrate form.
5. the transmission power calibration method of digital microwave transceiver according to claim 3, is characterized in that, in described step (1-3), the magnitude of voltage of a described setting is 0.02V, 0.01V, 0.4V or 0.5V.
6. the transmission power calibration method of digital microwave transceiver according to claim 4, is characterized in that, in described step (2-1), the performance number of a described setting is 15dBm, 10dBm or 20dBm.
7. the transmission power calibration method of digital microwave transceiver according to claim 4, is characterized in that, in described step (2-3), the step value of a described setting is 8MHz, 5MHz or 10MHz.
8. a calibration circuit of realizing the transmission power calibration method of digital microwave transceiver described in claim 1, it is characterized in that, comprise microwave unit and monitoring unit, described microwave unit comprises the first power detection pipe, the second power detection pipe, microwave amplifier and microwave attenuator, described the first power detection pipe and the second power detection pipe are arranged in identical temperature environment, and described monitoring unit comprises integrating network, linear regulation circuit, power control circuit and differential amplifier circuit; Described microwave attenuator, microwave amplifier, the first power detection pipe, differential amplifier circuit, linear regulation circuit are connected successively with integrating network, and integrating network is connected with microwave attenuator, make microwave attenuator, microwave amplifier, the first power detection pipe, differential amplifier circuit, linear regulation circuit and integrating network form a close loop control circuit, described the second power detection pipe is connected with differential amplifier circuit, and described power control circuit is connected with integrating network.
9. calibration circuit according to claim 8, is characterized in that, transmit from described microwave attenuator input, and the microwave amplifier of flowing through, and from the first power detection pipe output, described the first power detection pipe is the first detecting circuit for detection of the watt level transmitting the power transfer transmitting detecting of transmitting chain, and the first detecting circuit is fed back to differential amplifier circuit, differential amplifier circuit gathers the second detecting circuit on the second power detection pipe, the output voltage of described differential amplifier circuit is the poor of the first detecting circuit and the second detecting circuit, the output voltage of described differential amplifier circuit has been eliminated the impact of temperature on the first detecting circuit on the basis of the first detecting circuit, the output voltage of described differential amplifier circuit is the final detecting circuit transmitting, described detecting circuit through linear regulation circuit carry out linearity adjust after with power control circuit acting in conjunction in regulation and control integrating network, described integrating network output voltage control microwave attenuator, with the transmit signal power of control inputs microwave amplifier, form the closed-loop control of the power transmitting.
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