Transmitting power linearity calibration method, module, system, medium and product

Abstract

The invention discloses a transmitting power linearity calibration method, module and system, a medium and a product, and relates to the field of satellite communication, and the method comprises the steps: obtaining a power compensation value and a preset linear transmitting power value, and adjusting a power control word of the preset linear transmitting power value; sending the target power control word to one RDSS short message communication module to be calibrated, and obtaining an actual transmitting power value of the RDSS short message communication module for responding to the target power control word; obtaining a deviation power value between the true value and a preset linearized transmitting power value according to the true value of the actual transmitting power and the preset linearized transmitting power value; and determining whether the deviation power value is within a preset power error range, and if the deviation power value is outside the preset power error range, adjusting the true value until the deviation power value is within the preset power error range. According to the method and the device, the transmitting power linearity calibration efficiency of the RDSS short message communication module is improved.

Description

Technical Field

[0001] The present application relates to the field of satellite communication technology, and in particular to a transmission power linearity calibration method, an RDSS short message communication module, a calibration system for an RDSS short message communication module, a storage medium, and a computer program product. Background Art

[0002] At present, when the RDSS (Radio Determination Satellite Service) short message communication module is put into use, it is necessary to correctly respond to the power control command broadcast by the central station and adjust the corresponding inbound power. The inbound power adjustment requires that the short message communication module has 16 built-in inbound power levels, and each power level has an interval of 0.5dBm.

[0003] However, the L-band transmitting part of the RDSS short message communication module is composed of the BPSK (Binary Phase Shift Keying) signal processed by the baseband part, the transmitter (including DAC module, filter, up-conversion module, power amplifier module) and the like in series. The linearity of the output power of each part under different input power and frequency is different, that is, they all show a certain nonlinearity; in addition, due to the differences in the manufacturing process of each RDSS short message communication module, the RF channel gain of different RDSS short message communication modules is not exactly the same, that is, the same power control word is set, and the actual transmission power after passing through the RF channel is also different. Therefore, it is necessary not only to calibrate the power linearity of the L-band of the RDSS short message communication module under different power control words, but also to calibrate the 16-level transmission power between different RDSS short message communication modules and the transmission power set by factory default.

[0004] In the prior art, the first scheme is that the RDSS short message communication module L-band frequency point transmission power calibration is achieved by manually calibrating each gear by setting up the short message communication module in a microwave darkroom test system equipped with an RDSS satellite signal simulator; another scheme is that the RDSS short message communication module's transmission power calibration is achieved by setting up a wired environment, connecting the L-band output end of the RDSS short message communication module to a spectrum analyzer to adjust the transmission power after attenuating it by 40dB, and the 16-gear power calibration at a fixed transmission frequency requires at least 80 transmissions and measurements to calibrate the transmission power of the 16 gears at the fixed transmission frequency. In the actual calibration process, more transmissions and measurements are required. It can be seen that the RDSS short message communication module L-frequency point 16-gear transmission power linearity calibration method is complex to operate, time-consuming, and inefficient, and is not suitable for batch transmission power linearization calibration of RDSS short message communication modules. Summary of the invention

[0005] The main purpose of this application is to provide a transmission power linearity calibration method, an RDSS short message communication module, a calibration system for an RDSS short message communication module, a storage medium and a computer program product, aiming to solve the technical problem of low efficiency of transmission power calibration of an RDSS short message communication module.

[0006] To achieve the above object, the present application proposes a transmit power linearity calibration method, the method comprising: obtaining a power compensation value and a preset linearized transmit power value and a power control word for adjusting the preset linearized transmit power value;

[0007] Sending a target power control word to one of the RDSS short message communication modules to be calibrated, obtaining an actual transmit power value of the RDSS short message communication module to be calibrated in response to the target power control word, and calculating an average value of the actual transmit power value;

[0008] According to the real value of the actual transmit power and the preset linearized transmit power value, a deviation power value between the real value and the preset linearized transmit power value is calculated, wherein the real value is obtained by compensating the average value of the actual transmit power value by the compensation value;

[0009] Determine whether the deviation power value is within a preset power error range, and if the deviation power value is outside the preset power error range, adjust the true value until the deviation power value is within the preset power error range.

[0010] In one embodiment, the step of obtaining the power compensation value includes:

[0011] Switch the RF switch in the RF front end to the signal source calibration channel;

[0012] In the signal source calibration channel, set the test transmit power value at the test frequency corresponding to each frequency of the L-band inbound signal, and obtain the output transmit power value at the test frequency after passing the calibration system;

[0013] The difference between the test transmit power value and the output transmit power value is calculated, and the difference is used as a power compensation value and stored in an error compensation table.

[0014] In one embodiment, the RDSS short message communication module to be calibrated is in a first power gear at a preset transmission frequency; the method further includes:

[0015] When the RDSS short message communication module to be calibrated is in a preset power level interval at a preset transmission frequency, correcting the first power level to obtain a new first power level;

[0016] The step of sending the target power control word to one of the RDSS short message communication modules to be calibrated is performed until any preset power level in the preset power level interval is calibrated.

[0017] In one embodiment, after the step of completing the calibration for any preset power level in the preset power level interval, the method includes:

[0018] Adjusting the preset transmission frequency of the RDSS short message communication module to be calibrated to obtain a new transmission frequency;

[0019] At the new transmission frequency, the steps of obtaining the power compensation value and the preset linearized transmission power value and the power control word for adjusting the preset linearized transmission power value are performed until any preset power level in the preset power level interval at the preset transmission frequency is calibrated.

[0020] In one embodiment, after determining whether the deviation power value is within a preset power error range, the method further includes:

[0021] If the deviation power value is within the preset power error range, then based on the communication success rate, a target gear is selected from the gears of the preset linearized transmission power value;

[0022] The preset linearized transmission power value of the target gear is used as the actual factory transmission power value of the RDSS short message communication module.

[0023] In one embodiment, the step of adjusting the true value until the deviation power value is within a preset power error range includes:

[0024] Based on the deviation power value, the real value of the actual transmission power is adjusted to obtain a new real value of the actual transmission power;

[0025] Return to the step of calculating the deviation power value between the true value and the preset linearized transmit power value according to the true value of the actual transmit power and the preset linearized transmit power value, until the deviation power value is within the preset power error range.

[0026] In addition, to achieve the above-mentioned purpose, the present application also proposes an RDSS short message communication module, and the linearity of the transmission power of the RDSS short message communication module is calibrated by the transmission power linearity calibration method as described above.

[0027] In addition, to achieve the above-mentioned purpose, the present application also proposes a calibration system for an RDSS short message communication module, the system comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, the computer program being configured to implement the steps of the transmit power linearity calibration method as described above.

[0028] In addition, to achieve the above-mentioned purpose, the present application also proposes a storage medium, which is a computer-readable storage medium, and a computer program is stored on the storage medium. When the computer program is executed by the processor, the steps of the transmission power linearity calibration method described above are implemented.

[0029] In addition, to achieve the above-mentioned purpose, the present application also provides a computer program product, which includes a computer program, and when the computer program is executed by a processor, the steps of the transmit power linearity calibration method described above are implemented.

[0030] Compared with the prior art transmission power linearity calibration method, which requires manual adjustment of the transmission power for calibration in a microwave darkroom, the operation is complicated and the calibration efficiency is low; the transmission power linearity calibration method proposed in the present application obtains the power compensation value and the preset linearized transmission power value and the power control word used to adjust the preset linearized transmission power value, and then sends the target power control word to the RDSS short message communication module to obtain the actual transmission power value of the RDSS short message communication module, and obtains the average value of the actual transmission power value; calculates the deviation power value according to the true value of the actual transmission power and the preset linearized transmission power value, and if the deviation power value is outside the preset power error range, adjusts the true value of the actual transmission power until the deviation power value is within the preset power error range, thereby calibrating the actual transmission power value of the RDSS short message communication module.

[0031] Compared with the prior art calibration method, which is complicated to operate and time-consuming to calibrate, it is difficult to perform linearity calibration on the transmit power of each gear, and the transmit power calibration efficiency is low. The present application calibrates the true value of the actual transmit power of the RDSS short message communication module by directly calculating the deviation power value after obtaining the power compensation value and the preset linearized transmit power value and the power control word for adjusting the preset linearized transmit power value. If the deviation power value is outside the preset power error range, the true value of the actual transmit power can be adjusted in time, thereby reducing the complicated manual settings and multiple repeated measurement operation steps in the prior art, thereby improving the calibration efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0033] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0034] Figure 1 This is a schematic diagram of the RDSS short message communication module calibration system for this application;

[0035] Figure 2 A schematic diagram of a flow chart of a first embodiment of a method for calibrating transmission power linearity of the present application;

[0036] Figure 3 A brief flowchart diagram of the second embodiment of the transmit power linearity calibration method of the present application is provided;

[0037] Figure 4 This is a schematic diagram of the RDSS short message communication module structure for this application;

[0038] Figure 5 This is a schematic diagram of the device structure of the hardware operating environment involved in the transmit power linearity calibration method of this application.

[0039] The purpose, features and advantages of this application will be further described in conjunction with the embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0040] It should be understood that the specific embodiments described herein are only used to explain the technical solutions of the present application and are not used to limit the present application.

[0041] In order to better understand the technical solution of the present application, a detailed description will be given below in conjunction with the accompanying drawings and specific implementation methods.

[0042] With the full completion of the BeiDou-3 system, terminals and modules with regional and global short message functions have been warmly welcomed. At present, the transmission power requirement of the RDSS (Radio Determination Satellite Service) short message communication module in the network access authentication (i.e. correct response to the central station) is adjusted to the built-in 16-level entry power (i.e. preset linear power value), with each level interval of 0.5dB; in addition, in order to ensure the communication success rate of the RDSS short message communication module, the RDSS short message communication module will be set to a transmission power value with a higher communication success rate by default when it leaves the factory.

[0043] The L-band transmitting part of the RDSS short message communication module is composed of the BPSK signal processed by the baseband part, the transmitter (including DAC module, filter, up-conversion module, power amplifier module), the RF power amplifier, and the preamplifier in series. The linearity of the output power of each part is different under different input power and frequency, that is, they all show a certain nonlinearity; in addition, due to the differences in the manufacturing process of each RDSS short message communication module, that is, it is difficult to ensure that each RDSS short message communication module is completely consistent during the manufacturing process, resulting in different RDSS short message communication modules. The gains of the RF channels are not exactly the same, that is, the same target transmit power control word is set, and the actual transmit power value output by the RDSS short message communication module is different.

[0044] Therefore, it is necessary to calibrate the transmission power linearity of the RDSS short message communication module at different frequencies, requiring that the 16-level transmission power values ​​between different RDSS short message communication modules and the factory default transmission power settings be calibrated to be consistent with the preset linearized transmission power values. Among them, the L-band transmission channel is used to send the inbound transmission power of the RDSS short message communication module, including Lf0-Lf5, 6 frequency points, and the transmission frequencies under the 6 frequency points are as shown in Table 1 below:

[0045] Lf0 1615.68±4.08MHz Lf1 1614.26±4.08MHz Lf2 1618.34±4.08MHz Lf3 1622.42±4.08MHz Lf4 1624.524±1.6376MHz Lf5 1673.628±1.6376MHz

[0046] Table 1

[0047] The existing method of calibrating the linearity of the transmission power of the RDSS short message communication module at different frequencies is as follows: the first scheme is that the transmission power calibration of the L-band frequency point of the RDSS short message communication module is realized by manually calibrating each gear by setting up the short message communication module in a microwave darkroom test system equipped with an RDSS satellite signal simulator; the other scheme is that the transmission power calibration of the RDSS short message communication module is achieved by setting up a wired environment, connecting the L-band output end of the RDSS short message communication module to a spectrum analyzer to adjust the transmission power after attenuating it by 40dB, and the 16-gear power calibration at a fixed transmission frequency requires at least 80 transmissions and measurements to calibrate the transmission power of the 16 gears at the fixed transmission frequency. In the actual calibration process, the number of transmissions and measurements required will be more. It can be seen that the linearity calibration method of the transmission power of the 16 gears at the L-frequency point of the RDSS short message communication module is complex to operate, time-consuming, and inefficient, and is not suitable for the batch transmission power linearization calibration of the RDSS short message communication module.

[0048] The main solution of the embodiment of the present application is: after obtaining the power compensation value, the preset linearized transmission power value and the power control word for adjusting the preset linearized transmission power value, the target power control word is sent to the RDSS short message communication module to obtain the actual transmission power value of the RDSS short message communication module and obtain the average value of the actual transmission power value; according to the real value of the actual transmission power and the preset linearized transmission power value, the deviation power value is calculated. If the deviation power value is outside the preset power error range, the real value of the actual transmission power is adjusted until the deviation power value is within the preset power error range, thereby calibrating the actual transmission power value of the RDSS short message communication module; when the present application calibrates the real value of the actual transmission power of the RDSS short message communication module, after obtaining the power compensation value, the preset linearized transmission power value and the power control word for adjusting the preset linearized transmission power value, the deviation power value is directly calculated. If the deviation power value is outside the preset power error range, the real value of the actual transmission power can be adjusted in time, thereby reducing the complicated manual setting and repeated measurement operation steps in the prior art, thereby improving the calibration efficiency.

[0049] In addition, due to the limited number of manual settings and adjustments, it is difficult to ensure that the power error is minimized, and there is a problem of inaccurate calibration of the RDSS short message communication module. The present application can increase the number of adjustments and further shorten the power control interval by continuously and automatically adjusting until the deviation power value is within the preset power error range, thereby ensuring that the calibrated transmission power is more accurate.

[0050] In this embodiment, for the convenience of description, the calibration system of the RDSS short message communication module (hereinafter referred to as the calibration system) is used as the execution body for explanation.

[0051] Before calibrating the RDSS short message communication module, first build the calibration system of the RDSS short message communication module, such as Figure 1 As shown, the calibration system includes a computer, a test fixture, a radio frequency front end and a digital processing circuit, wherein the computer is connected to the test fixture through a serial port, the serial port is connected to a one-serial-port-to-multi-serial-port module, and each output port of the one-serial-port-to-multi-serial-port module corresponds to an RDSS short message communication module.

[0052] The computer selects the current short message communication module to be tested through a 1 serial port to N serial port module, and transmits the target power control word to the RDSS short message communication module to be tested through the serial port; the RDSS short message communication module responds to the target power control word by sending a radio frequency signal to the radio frequency front end through the L port, and the radio frequency front end switches the radio frequency signal into the attenuator through the radio frequency switch; the attenuator and the down-conversion module perform attenuation, filtering, frequency conversion and other operations on the received radio frequency signal, and output an intermediate frequency signal; the digital processing module performs analog-to-digital conversion on the intermediate frequency signal after receiving the intermediate frequency signal, and determines the actual transmission power of the short message communication module to be tested through the analytical calculation module, and feeds back the test data of the short message communication module to be tested to the computer through the Ethernet interface.

[0053] Based on this, the embodiment of the present application provides a method for calibrating the linearity of transmission power, referring to Figure 2 , Figure 2 This is a flow chart of the first embodiment of the transmit power linearity calibration method of the present application.

[0054] In this embodiment, the transmit power linearity calibration method includes steps S10 to S40:

[0055] In one embodiment, the linearity calibration of the transmission power refers to calibrating the true value of the actual transmission power between each gear of the RDSS short message communication module, and the step between each gear is a fixed value, that is, the difference between the true value of the actual transmission power at gear 2 and the true value of the actual transmission power at gear 1 is the difference between the true value of the actual transmission power at gear 3 and the true value of the actual transmission power at gear 2.

[0056] Step S10, obtaining a power compensation value, a preset linearized transmit power value, and a power control word for adjusting the preset linearized transmit power value;

[0057] It should be noted that the power compensation value is obtained by calibrating the signal source before the calibration system tests the RDSS short message communication module, and is used to compensate for the average value of the actual transmit power. The preset linearized transmit power value is the target transmit power value, specifically including 16-level transmit power values ​​for each frequency point in the L band. The power control word is used to adjust the preset linearized transmit power value. As shown in Table 2, each level of each frequency point has a corresponding power control word, and 16 levels have 16 power control words. Exemplarily, one power control word corresponds to one preset linearized transmit power value.

[0058]

[0059]

[0060] Table 2

[0061] In one embodiment, step S10 includes steps A10 to A30:

[0062] Step A10, switching the RF switch in the RF front end to the signal source calibration channel;

[0063] It should be noted that if Figure 1 As shown, the RF front end is part of the calibration system. The RF front end includes an RF switch, a filter, an amplifier, etc. The RF front end is used to receive the L-band RF signal output by any RDSS short message communication module to be calibrated, and then transmit the L-band RF signal to the digital part of the calibration system for data processing; wherein, the RF switch is a device that can switch between different RF signal paths, switching the RF signal from one channel to another. The signal source is a device that generates RF signals; the calibration channel is the signal path used for calibration. During calibration, it is necessary to calibrate each frequency point of the L-band inbound signal. Calibration is performed to ensure that the entire calibration system can calibrate the RDSS short message communication module normally and accurately.

[0064] Step A20, in the signal source calibration channel, setting the test transmit power value at the test frequency corresponding to each frequency of the L-band inbound signal, and obtaining the output transmit power value at the test frequency after passing the calibration system;

[0065] It should be noted that the frequency points of the L-band inbound signal are shown in Table 1, and the test frequency point is one of the frequency points, such as the test Lf0 frequency point; the test transmit power value at the test frequency point is the power value sent by the calibration signal source to the calibration system, such as the test transmit power value is 5dBm. The output transmit power value after calibration at the test frequency point is the power value output by the calibration system, such as the calibration system output transmit power value is 0dBm at the Lf0 frequency point.

[0066] Step A30, calculating the difference between the test transmit power value and the output transmit power value, taking the difference as a power compensation value and storing it in an error compensation table.

[0067] It should be noted that the difference obtained by subtracting the output transmission power value from the test transmission power value is the power compensation value of the calibration system; for example, the power compensation value is 5dBm-0dBm=5dBm.

[0068] It can be expressed as: ΔP jz =P jz -P jxy , where ΔP jz Indicates the power compensation value, P jz Indicates the test transmission power value, P jxy Indicates the output transmit power value.

[0069] The error compensation table stores the power compensation values ​​at each frequency point in the L band to obtain the true value of the actual transmission power.

[0070] In this embodiment, the RF front end is compensated by the power compensation value to obtain an RF front end that can adjust the transmit power more accurately, thereby ensuring the accuracy of the subsequent transmit power linearity calibration. For RDSS short message communication, accurate transmit power can improve the quality of signal transmission; calculating the power compensation value helps to improve the stability of the entire RDSS short message communication system. Because the power characteristics of each RF front end can be accurately compensated, the power coordination between the modules is more accurate, which improves the overall reliability and communication efficiency of the system.

[0071] Step S20, sending a target power control word to one of the RDSS short message communication modules to be calibrated, obtaining an actual transmit power value of the RDSS short message communication module to be calibrated in response to the target power control word, and calculating an average value of the actual transmit power values;

[0072] It should be noted that the computer sends a target power control word to one of the RDSS short message communication modules to be calibrated, and the RDSS short message communication module responds to the target power control word to obtain an actual transmission power value; wherein, the computer sends the target power control word to calibrate one of the RDSS short message communication modules to be calibrated at a preset number of times, a preset frequency, and a preset gear. Exemplarily, the preset number of times is 3 times, the preset frequency is the frequency at the Lf0 frequency point, and the preset gear is gear 1.

[0073] It should also be noted that since the computer sends the target power control word to one of the RDSS short message communication modules to be calibrated a preset number of times (such as 3 times), the actual transmission power value obtained should have a preset number of times (such as 3 actual transmission power values), and then the average value of the actual transmission power is calculated based on the actual transmission power values ​​of the preset number of times.

[0074] Step S30, calculating a deviation power value between the real value and the preset linearized transmit power value according to the real value of the actual transmit power and the preset linearized transmit power value, wherein the real value is obtained by compensating the average value of the actual transmit power value with the power compensation value;

[0075] It should be noted that since the true value of the actual transmit power is obtained at the preset frequency and preset gear, the preset linearized transmit power value is the standard value corresponding to the preset frequency and preset gear. For example, the transmit power value of gear 1 at the Lf0 frequency point is 28.5dBm; among them, the true value of the actual transmit power is the power compensation value plus the average value of the actual transmit power. This is because the calibration system itself has certain errors. Therefore, the power compensation value needs to be added when calculating the final result as the final transmit power value to minimize the error.

[0076] In addition, it should be noted that the calculation formula of the deviation power value is as follows: Where ΔP fft is the deviation power value, P fft is the average value of the actual transmission power, is the power compensation value, P ij is the preset linearized transmit power value. The value of i ranges from 0 to 5, indicating different frequency points in the L band. The value of j ranges from 0 to 15, indicating 16 gears. is the true value of the actual transmit power.

[0077] Step S40, determining whether the deviation power value is within a preset power error range, if the deviation power value is outside the preset power error range, adjusting the true value until the deviation power value is within the preset power error range.

[0078] It should be noted that the above-mentioned preset frequency is a preset transmission frequency. The calculated deviation power value is compared with a preset power error range. Exemplarily, the preset power error range is less than or equal to 0.3dBm, that is, ≤0.3dBm;

[0079] If ΔP fft >0.3dBm, then adjust the actual value The adjustment method is to increase or decrease the actual value of the actual transmission power according to the deviation power value, and then calculate the deviation power value ΔP again. fft , until ΔP fft ≤0.3dBm, it means that an RDSS short message communication module to be calibrated has been calibrated at the preset frequency and preset gear, and the power gear number after calibration, the calibrated transmit power value and the corresponding power control word, calibration error and factory transmit power value are saved; for example, the transmit power value of the RDSS short message communication module at the Lf0 frequency gear 1 after calibration is 28.5dBm, then the preset transmit frequency is 1615.68±4.08MHz, the calibrated transmit power value is 28.5dBm, the power control word is control word 1, the calibration error is △P01, and the power gear number is 1.

[0080] During actual satellite communications, the calibrated transmission power value enables different RDSS short message communication modules to set the same target transmission power control word during network authentication. Ultimately, the actual value of the actual transmission power obtained at the output interface of the RDSS short message communication module is the same, which can be used to improve the communication success rate of the RDSS short message communication module under different usage environments during actual satellite communications.

[0081] In this embodiment, when the deviation power value is within the preset range, it means that the transmit power of the calibrated RDSS short message communication module has reached the expected accuracy requirement, the stability and accuracy of the transmit power are guaranteed, and it is helpful to improve the reliability of signal transmission. In addition, when the present application calibrates the true value of the actual transmit power of the RDSS short message communication module, after obtaining the power compensation value and the preset linearized transmit power value and the power control word for adjusting the preset linearized transmit power value, the deviation power value is directly calculated. If the deviation power value is outside the preset power error range, the true value of the actual transmit power can be adjusted in time. By continuously adjusting until the deviation power value is within the preset power error range, it can be ensured that the calibrated transmit power is more accurate, while reducing the complicated manual settings and repeated measurement steps in the prior art, thereby improving the calibration efficiency; in addition, the present application can calibrate different power gears of the RDSS short message communication module to ensure that accurate calibration can be achieved under various power requirements, so that the linearity calibration of the transmit power of the RDSS short message communication module is more comprehensive and accurate.

[0082] In one embodiment, step S40 includes steps B10 to B20:

[0083] Step B10, adjusting the real value of the actual transmit power based on the deviation power value to obtain a new real value of the actual transmit power;

[0084] It should be noted that, based on the deviation power value, the real value of the actual transmit power is adjusted, and the adjusted real value of the actual transmit power is used as the new real value of the actual transmit power.

[0085] Step B20, returning to the step of calculating the deviation power value between the real value and the preset linearized transmit power value according to the real value of the actual transmit power and the preset linearized transmit power value, until the deviation power value is within the preset power error range.

[0086] It should be noted that based on the true value of the new actual transmission power, the calibration system returns and executes the calculation of its deviation power value. After completing the calculation of the deviation power value, it compares the deviation power value with the preset power error range, and re-verifies whether the deviation power value is within the preset power error range.

[0087] In this embodiment, by continuously adjusting and recalculating the deviation power value, the actual transmission power can be made closer and closer to the preset linearized transmission power value, and the transmission power accuracy of the RDSS short message communication module is continuously improved, which helps to improve the accuracy of signal transmission; this iterative calibration process can ensure that the transmission power of the entire RDSS short message communication system is stable within a reasonable range. Stable transmission power helps to maintain the normal operation of the system and reduce the risk of communication interruption or instability caused by power fluctuations.

[0088] In another embodiment, after step S40, steps T10 to T20 are further included:

[0089] Step T10, if the deviation power value is within the preset power error range, then based on the communication success rate, a target gear is selected from the gears of the preset linearized transmission power value;

[0090] It should be noted that the deviation power value within the preset power error range indicates that the transmit power value calibration of the RDSS short message communication module is successful; since the preset linearized transmit power value is calculated based on experimental data, during the experiment, the gear with the highest communication success rate will be selected as the target gear among the 16 transmission power values.

[0091] Step T20, taking the preset linearized transmission power value of the target gear as the actual factory transmission power value of the RDSS short message communication module.

[0092] It should be noted that the calibrated RDSS short message communication module needs to use the preset linearized transmission power value under the target gear as the actual factory transmission power value; for example: the target gear is gear 13, and the transmission power value under gear 13 is 35dBm, then the actual factory transmission power value of the calibrated RDSS short message communication module is 35dBm.

[0093] In this embodiment, selecting the target gear based on the communication success rate can ensure that the RDSS short message communication module has good communication capabilities when it leaves the factory. The actual factory transmission power value determined in this way can maximize the communication success rate and reduce the signal transmission failure while meeting the power accuracy requirements, thereby improving the overall communication performance of the product equipped with the RDSS short message communication module.

[0094] Since the prior art manually adjusts each transmission frequency and the corresponding gear at each transmission frequency through a test system set up in a microwave darkroom, and when calibrating each RDSS short message communication module, the transmission is started at least 300 times and more than 300 measurements are performed; when the calibration of a certain transmission frequency is completed, the power gear cannot be automatically switched to perform the next calibration of the RDSS short message communication module; the transmission frequency and power gear are manually adjusted for calibration, resulting in low efficiency in the linearity calibration of the transmission power.

[0095] Based on this, the second embodiment of the present application automatically changes the power level after the calibration of one power level is completed at the same transmission frequency until all power levels are calibrated; in addition, when the calibration of all power levels of a transmission frequency is completed, it automatically switches to the new transmission frequency and calibrates the power levels under the new transmission frequency.

[0096] Based on the first embodiment of the present application, in the second embodiment of the present application, the same or similar contents as those in the first embodiment can refer to the above introduction, and will not be repeated in the following. Figure 3 , the RDSS short message communication module to be calibrated is in the first power gear under the preset transmission frequency; the transmission power linearity calibration method also includes steps D10 to D20:

[0097] Step D10, when the RDSS short message communication module to be calibrated is in a preset power level interval at a preset transmission frequency, adjusting the first power level to obtain a new first power level;

[0098] It should be noted that when calibrating the RDSS short message communication module, it is necessary to calibrate the transmission power at 6 frequency points in the L band and the transmission power values ​​at 16 gears, that is, each transmission frequency has 16 gears that need to be calibrated, and it is impossible to calibrate all gears at all transmission frequencies at the same time; therefore, after calibrating the first power gear at the preset transmission frequency, the power gear needs to be adjusted at the same transmission frequency, for example: at the Lf0 frequency transmission frequency, first calibrate gear 1, and then calibrate gear 2, until all 16 gears of the Lf0 frequency are calibrated, where the preset power gear range is 0 to 15, 16 gear range.

[0099] Step D20, executing the step of sending a target power control word to one of the RDSS short message communication modules to be calibrated, until any preset power level in the preset power level interval is calibrated.

[0100] It should be noted that, under the same transmission frequency, a new first power gear is obtained for the first power gear; this is equivalent to changing the power control word of the preset linearized transmission power value given by the computer to the RDSS short message communication module. For example, under the Lf0 frequency point, there are 16 gears, and the linearization gears are pre-set to 36dBm, 35.5dBm, 35dBm...28.5dBm; each gear power has a corresponding power control word in advance.

[0101] As shown in Table 3: The RF chip transmit power control word registers R11D<8:4>TXLPF_GAIN_SPI, R11D<11:9>TXPPA_GAINCTRL, R11 D<3:0>TXMIX_GAINCTRL, and R72D<17:14>TXPPA_IBIAS_SPI are the power control words, 5.86, 5.49, 5.11, 4.71, and 4.30 are the gear powers, that is, the transmit power values ​​at different gears, and the gain step is the difference between the transmit power values ​​at the two gears.

[0102]

[0103]

[0104] Table 3

[0105] In another embodiment, after step D20, steps E10 to E20 are included:

[0106] Step E10, adjusting the preset transmission frequency of the RDSS short message communication module to be calibrated to obtain a new transmission frequency;

[0107] It should be noted that after all gears under one transmission frequency are calibrated, the transmission frequency is changed to obtain a new transmission frequency, that is, adjusted from Lf0 to Lf1.

[0108] Step E20, at the new transmission frequency, execute the steps of obtaining the power compensation value and the preset linearized transmission power value and the power control word for adjusting the preset linearized transmission power value until any preset power level in the preset power level interval at the preset transmission frequency is calibrated.

[0109] It should be noted that, at the new transmission frequency, the power compensation value at the new transmission frequency and the preset linearized transmission power value at the new transmission frequency are re-acquired, and each gear at the new transmission frequency is calibrated until all gears of all transmission frequencies are completed.

[0110] It should also be noted that after completing the calibration of an RDSS short message communication module, it is equivalent to completing the calibration of the RDSS short message communication module of channel 1, switching channels and turning off the power of modules not involved in the test, and calibrating the RDSS short message communication module of channel 2 according to the above method until the RDSS short message communication module of channel N is calibrated.

[0111] In this embodiment, different transmission frequencies may correspond to different channel characteristics. By adjusting the frequency and calibrating the power, the most suitable frequency-power combination can be found, thereby improving the transmission efficiency and reliability of the signal; the calibration of all preset power gears under the preset transmission frequency is completed, ensuring the accuracy of the RDSS short message communication module under various working conditions. This enables the RDSS short message communication module to accurately transmit signals under different power requirements, ensuring the integrity and stability of the RDSS short message communication module function.

[0112] In this embodiment, calibrating each preset power level can ensure that a high power accuracy can be achieved under different power requirements. Whether it is a low power or high power level, the power can be accurately transmitted to reduce power deviation; by ensuring the accuracy of each power level, the one-to-one correspondence between the tested power and frequency can be reliably guaranteed, thereby improving the reliability of the test.

[0113] Exemplarily, in order to help understand the implementation process of the transmit power linearity calibration method obtained by combining this embodiment with the above-mentioned first embodiment, the entire implementation process is described here, specifically:

[0114] It should be noted that the calibration system needs to be powered on when testing the RDSS short message communication module.

[0115] Step 1: Install N RDSS short message communication modules on the test fixture. Figure 1 Build a calibration system, and power on the test fixture, RF front end, and digital processing circuit respectively. The power supply of the RDSS short message communication module is disconnected. When switching to the RDSS short message communication module to be tested, the power supply of the channel to which the tested RDSS short message communication module belongs is started. Because a large current is required when testing the RDSS short message communication module, in order to ensure the reliability of the test, the power supply on the channel to which other untested RDSS short message communication modules belong needs to be turned off;

[0116] Step 2: Start the correction signal source, switch the RF switch in the RF front-end module to the calibration signal source channel, set the frequency points Lf0, Lf1, Lf2, Lf3, Lf4, Lf5 in sequence, and the transmit power value is 5dBm. Through the calibration system, calculate the power deviation of each frequency point respectively, and obtain the power compensation value at each frequency point, which is used to compensate the power of the RDSS short message module to obtain the real power value, where RF cable 0 to RF cable N are of equal length.

[0117] Step 3: Formal start of the test, switch the test channel to module 1 channel through the computer-controlled calibration system, set the L band frequency point and the power control word according to the pre-stated 16-position transmission power control word, start the transmission frequency, and the RDSS short message communication module 1 outputs the RF signal (0dBW-10dBW) through the L port. After passing the calibration system; the computer calculates the transmission frequency and power of L, and starts the transmission 3 times for each power word, and finally obtains the average value of the transmission power of 3 times. The L transmission power is further calculated and compared with the 16-position standard value pre-stored in the computer to obtain the deviation, and the power of the position is calibrated until it is controlled within the allowed range. According to the above steps, the 16-position transmission power of the frequency point is calibrated in sequence, and finally the calibration data of each module is saved and the factory parameters are set. Switch the remaining frequency points in sequence, and calibrate the 16-position power value of each remaining frequency point in this way. After the calibration of RDSS short message communication module 1 is completed, switch channels 2, 3...N in sequence (i.e. switch the RDSS short message communication module to be tested), and at the same time turn off the power supply on the channel to which the RDSS short message communication module not involved in the test belongs until the calibration of all RDSS short message communication modules is completed.

[0118] It should be noted that the above examples are only used to understand the present application and do not constitute a limitation on the transmit power linearity calibration method of the present application. More simple transformations based on this technical concept are all within the scope of protection of the present application.

[0119] This application also provides a RDSS short message communication module, please refer to Figure 4 The RDSS short message communication module includes: a radio frequency board and a digital board.

[0120] The RF board mainly completes the low-noise amplification of the BeiDou-3 regional short message (i.e., the RDSS short message communication module) and the global short message signal (i.e., the model sent by the RDSS short message communication module) (such as Figure 4The RF board includes RF chip, DAC (Digital-to-Analog Converter), voltage-controlled temperature-compensated crystal oscillator, LNA (Low Noise Amplifier), power amplifier, B2b intermediate frequency, S intermediate frequency, so as to realize the up-conversion of the baseband signal output by the digital board. The up-converted signal is amplified by the power amplifier and sent through the antenna.

[0121] The digital board includes a baseband processing unit, a crystal oscillator, a power management circuit, and an interface circuit, which mainly complete the BPSK signal processing and information processing of the B2b intermediate frequency, S intermediate frequency, and the transmitted message. The IQ (in-phase quadrature) signal of the S intermediate frequency and B2b intermediate frequency output by the receiving RF board is converted through DAC, and the satellite navigation signal is captured and tracked through the host interface, and the navigation message is parsed and processed. The regional and global short message inbound and outbound protocol processing and communication protocol processing are completed, and the signal is output through the serial port and timing pulse interface.

[0122] The RDSS short message communication module provided in the present application adopts the transmission power linearity calibration method in the above-mentioned embodiment, which can solve the technical problem of low transmission power calibration efficiency of the RDSS short message communication module.

[0123] The present application provides a calibration system for an RDSS short message communication module, and the calibration system for the RDSS short message communication module includes: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the transmission power linearity calibration method in the above-mentioned first embodiment.

[0124] Reference below Figure 5 , which shows a schematic diagram of the structure of the calibration system of the RDSS short message communication module suitable for implementing the embodiment of the present application. The calibration system of the RDSS short message communication module in the embodiment of the present application may include but is not limited to mobile terminals such as mobile phones, laptop computers, digital broadcast receivers, PDAs (Personal Digital Assistants), PADs (Portable Application Descriptions), PMPs (Portable Media Players), vehicle-mounted terminals (such as vehicle-mounted navigation terminals), etc., and fixed terminals such as digital TVs, desktop computers, etc. Figure 5The calibration system of the RDSS short message communication module shown is merely an example and should not bring any limitation to the functions and scope of use of the embodiments of the present application.

[0125] like Figure 5 As shown, the calibration system of the RDSS short message communication module may include a processing device 1001 (such as a central processing unit, a graphics processor, etc.), which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM: Read Only Memory) 1002 or a program loaded from a storage device 1003 to a random access memory (RAM: Random Access Memory) 1004. In RAM1004, various programs and data required for the operation of the calibration system of the RDSS short message communication module are also stored. The processing device 1001, ROM1002 and RAM1004 are connected to each other through a bus 1005. An input / output (I / O) interface 1006 is also connected to the bus. Typically, the following systems may be connected to the I / O interface 1006: an input device 1007 including, for example, a touch screen, a touchpad, a keyboard, a mouse, an image sensor, a microphone, an accelerometer, a gyroscope, etc.; an output device 1008 including, for example, a liquid crystal display (LCD), a speaker, a vibrator, etc.; a storage device 1003 including, for example, a magnetic tape, a hard disk, etc.; and a communication device 1009. The communication device 1009 may allow the calibration system of the RDSS short message communication module to communicate wirelessly or wired with other devices to exchange data. Although the calibration system of the RDSS short message communication module with various systems is shown in the figure, it should be understood that it is not required to implement or have all the systems shown. More or fewer systems may be implemented or have instead.

[0126] In particular, according to the embodiments disclosed in the present application, the process described above with reference to the flowchart can be implemented as a computer software program. For example, the embodiments disclosed in the present application include a computer program product, which includes a computer program carried on a computer-readable medium, and the computer program includes a program code for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network through a communication device, or installed from a storage device 1003, or installed from a ROM 1002. When the computer program is executed by the processing device 1001, the above-mentioned functions defined in the method of the embodiment disclosed in the present application are executed.

[0127] The calibration system of the RDSS short message communication module provided by the present application adopts the transmission power linearity calibration method in the above embodiment, which can solve the technical problem of low efficiency of transmission power calibration of the RDSS short message communication module. Compared with the prior art, the beneficial effects of the calibration system of the RDSS short message communication module provided by the present application are the same as the beneficial effects of the transmission power linearity calibration method provided by the above embodiment, and other technical features of the calibration system of the RDSS short message communication module are the same as the features disclosed in the method of the previous embodiment, which will not be repeated here.

[0128] It should be understood that the various parts disclosed in this application can be implemented by hardware, software, firmware or a combination thereof. In the description of the above embodiments, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0129] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

[0130] The present application provides a computer-readable storage medium having computer-readable program instructions (ie, computer programs) stored thereon, and the computer-readable program instructions are used to execute the transmit power linearity calibration method in the above-mentioned embodiment.

[0131] The computer-readable storage medium provided in the present application may be, for example, a USB flash drive, but is not limited to electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems or devices, or any combination of the above. More specific examples of computer-readable storage media may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM: Random Access Memory), a read-only memory (ROM: Read Only Memory), an erasable programmable read-only memory (EPROM: Erasable Programmable Read Only Memory or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM: CD-Read Only Memory), an optical storage device, a magnetic storage device, or any suitable combination of the above. In this embodiment, the computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in combination with an instruction execution system or device. The program code contained on the computer-readable storage medium may be transmitted using any appropriate medium, including but not limited to: wires, optical cables, RF (Radio Frequency: Radio Frequency), etc., or any suitable combination of the above.

[0132] The computer-readable storage medium may be included in the calibration system of the RDSS short message communication module; or may exist independently without being assembled into the calibration system of the RDSS short message communication module.

[0133] The computer-readable storage medium carries one or more programs. When the one or more programs are executed by the calibration system of the RDSS short message communication module, the calibration system of the RDSS short message communication module: obtains a power compensation value and a preset linearized transmission power value and a power control word for adjusting the preset linearized transmission power value; sends a target power control word to one of the RDSS short message communication modules to be calibrated, and obtains the actual transmission power value of the RDSS short message communication module to be calibrated in response to the target power control word, and calculates the average value of the actual transmission power value; calculates the deviation power value between the real value and the preset linearized transmission power value according to the real value of the actual transmission power and the preset linearized transmission power value, wherein the real value is obtained by compensating the average value of the actual transmission power value by the compensation value; determines whether the deviation power value is within a preset power error range, and if the deviation power value is outside the preset power error range, adjusts the real value until the deviation power value is within the preset power error range.

[0134] Computer program code for performing the operations of the present application may be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, C++, and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a separate software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0135] The flow chart and block diagram in the accompanying drawings illustrate the possible architecture, function and operation of the system, method and computer program product according to various embodiments of the present application. In this regard, each box in the flow chart or block diagram can represent a module, a program segment or a part of a code, and the module, the program segment or a part of the code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in the order marked in the accompanying drawings. For example, two boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or flow chart, and the combination of the boxes in the block diagram and / or flow chart can be implemented with a dedicated hardware-based system that performs a specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0136] The modules involved in the embodiments described in this application may be implemented by software or hardware, wherein the name of the module does not constitute a limitation on the unit itself in some cases.

[0137] The readable storage medium provided by the present application is a computer-readable storage medium, which stores computer-readable program instructions (i.e., computer programs) for executing the above-mentioned transmit power linearity calibration method, and can solve the technical problem of low efficiency of transmit power calibration of RDSS short message communication module. Compared with the prior art, the beneficial effects of the computer-readable storage medium provided by the present application are the same as the beneficial effects of the transmit power linearity calibration method provided by the above-mentioned embodiment, and will not be repeated here.

[0138] The present application also provides a computer program product, including a computer program, which implements the steps of the above-mentioned transmit power linearity calibration method when executed by a processor.

[0139] The computer program product provided by the present application can solve the technical problem of low efficiency of transmission power calibration of RDSS short message communication module. Compared with the prior art, the beneficial effects of the computer program product provided by the present application are the same as the beneficial effects of the transmission power linearity calibration method provided by the above embodiment, which will not be repeated here.

[0140] The above descriptions are only some embodiments of the present application, and are not intended to limit the patent scope of the present application. All equivalent structural changes made using the contents of the present application specification and drawings under the technical concept of the present application, or direct / indirect applications in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A method for calibrating transmission power linearity, characterized in that: The transmit power linearity calibration method comprises: Obtaining a power compensation value and a preset linearized transmit power value and a power control word for adjusting the preset linearized transmit power value; Sending a target power control word to one of the RDSS short message communication modules to be calibrated, obtaining an actual transmit power value of the RDSS short message communication module to be calibrated in response to the target power control word, and calculating an average value of the actual transmit power value; According to the real value of the actual transmit power and the preset linearized transmit power value, a deviation power value between the real value and the preset linearized transmit power value is calculated, wherein the real value is obtained by compensating the average value of the actual transmit power value by the power compensation value; Determine whether the deviation power value is within a preset power error range, and if the deviation power value is outside the preset power error range, adjust the true value until the deviation power value is within the preset power error range.

2. The transmit power linearity calibration method according to claim 1, wherein: The step of obtaining the power compensation value comprises: Switch the RF switch in the RF front end to the signal source calibration channel; In the signal source calibration channel, set the test transmit power value at the test frequency corresponding to each frequency of the L-band inbound signal, and obtain the output transmit power value at the test frequency after passing the calibration system; The difference between the test transmit power value and the output transmit power value is calculated, and the difference is used as a power compensation value and stored in an error compensation table.

3. The transmit power linearity calibration method according to claim 1, wherein: The RDSS short message communication module to be calibrated is in a first power gear under a preset transmission frequency; the method further includes: When the RDSS short message communication module to be calibrated is in a preset power level interval at a preset transmission frequency, correcting the first power level to obtain a new first power level; The step of sending the target power control word to one of the RDSS short message communication modules to be calibrated is performed until any preset power level in the preset power level interval is calibrated.

4. The transmit power linearity calibration method according to claim 3, characterized in that: After the step of completing the calibration for any preset power level in the preset power level interval, the method further comprises: Adjusting the preset linearized transmission frequency of the RDSS short message communication module to be calibrated to obtain a new transmission frequency; At the new transmission frequency, the steps of obtaining the power compensation value and the preset linearized transmission power value and the power control word for adjusting the preset linearized transmission power value are performed until any preset power level in the preset power level interval at the preset transmission frequency is calibrated.

5. The transmit power linearity calibration method according to claim 1, wherein: After determining whether the deviation power value is within the preset power error range, the method further includes: If the deviation power value is within the preset power error range, then based on the communication success rate, a target gear is selected from the gears of the preset linearized transmission power value; The preset linearized transmission power value of the target gear is used as the actual factory transmission power value of the RDSS short message communication module.

6. The transmit power linearity calibration method according to claim 1, wherein: The step of adjusting the true value until the deviation power value is within a preset power error range includes: Based on the deviation power value, the real value of the actual transmission power is adjusted to obtain a new real value of the actual transmission power; Return to the step of calculating the deviation power value between the true value and the preset linearized transmit power value according to the true value of the actual transmit power and the preset linearized transmit power value, until the deviation power value is within the preset power error range.

7. A RDSS short message communication module, characterized in that: The linearity calibration of the transmission power of the RDSS short message communication module is performed by the transmission power linearity calibration method according to any one of claims 1 to 6.

8. A calibration system for an RDSS short message communication module, characterized in that: The system comprises: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the computer program is configured to implement the steps of the transmit power linearity calibration method according to any one of claims 1 to 6.

9. A storage medium, characterized in that: The storage medium is a computer-readable storage medium, and a computer program is stored on the storage medium. When the computer program is executed by a processor, the steps of the transmit power linearity calibration method according to any one of claims 1 to 6 are implemented.

10. A computer program product, characterized in that The computer program product comprises a computer program, and when the computer program is executed by a processor, the steps of the transmit power linearity calibration method according to any one of claims 1 to 6 are implemented.

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