System and method for automatic calibration of electronically tunable filter parameters of wireless communication terminal

Abstract

The present invention provides a system and method for automatic calibration of parameters of an electrically tunable filter of a wireless communication terminal, wherein the system includes a hardware body and software firmware; the hardware body includes a target terminal device and a computer, and a cable is used to connect the transmission signal output port and the reception signal input port of the target terminal device, and the software firmware includes a target terminal device remote control unit, a target terminal device control unit and a calibration control unit, the target terminal device remote control unit controls the target terminal device to complete the upper-layer actions in the calibration process; the target terminal device control unit realizes the inherent functions of the target terminal device; and the calibration control unit controls the target terminal device to complete all the underlying actions. The present invention automatically calibrates the unique electrically tunable filter parameters formed after the circuit state and the structural state of each target terminal device are fixed, and the controller accurately matches the center frequency of the electrically tunable filter with the transceiver frequency based on the data, thereby improving the anti-interference ability and sensitivity of the wireless communication terminal.

Description

Technical Field

[0001] The present invention relates to the field of wireless communication and automatic testing, and in particular to a system and method for automatically calibrating parameters of an electrically adjustable filter of a wireless communication terminal. Background Art

[0002] With the rapid development of wireless communication technology, electronically tunable filters are increasingly used in RF transceiver components. Electronically tunable filters, as the name suggests, can change the filter indicators through electrical adjustment so that the center frequency band changes within a certain range. In the transmitter, the electronically tunable filter plays a key role. It can effectively filter out noise and nonlinear signals generated by other nonlinear devices, ensuring that the main signal is transmitted outward through the antenna without interference, thereby improving the effective range of wireless communication; in the receiver, the electronically tunable filter can accurately select useful signals from a large number of spectrum signals and suppress various interference signals outside the required frequency band, thereby improving the anti-interference ability of the receiver.

[0003] For wireless communication terminals, accurately matching the center frequency of the electrically tunable filter with the transceiver frequency is the key to improving its anti-interference ability and sensitivity. The center frequency of the electrically tunable filter is usually controlled by the electrically tunable filter parameters inside the wireless communication terminal. The electrically tunable filter parameters here refer to the parameters related to the center frequency of the electrically tunable filter in the target terminal device, which are generally the parameters of the DA chip connected to the electrically tunable filter. However, the electrically tunable filter parameters of the target terminal device will be affected by many factors, such as circuit, structure, and individual differences in components. This results in certain differences in the corresponding electrically tunable filter parameters of each target terminal device at the same transceiver frequency, that is, each target terminal device has its own unique inherent electrically tunable filter parameters. Therefore, the process of calibrating the electrically tunable filter parameters of the target terminal device is indispensable.

[0004] In the past, there were two main commonly used calibration methods. The first is to calibrate the parameters of the electrically tunable filter of a certain model of a certain set of target terminal equipment, and then use this to adapt to all devices of the same model. However, this method has obvious defects. The performance of the equipment produced in this way is unsatisfactory in terms of signal-to-noise ratio and operating distance. This fully reflects the serious impact of the differences in the parameters of the electrically tunable filters between different devices on the performance of the equipment. The second method is to manually calibrate the parameters of the electrically tunable filters of all target terminal devices of this model separately, and store the parameters in the control firmware of the underlying controller. Although this method can make the equipment perform well, it also has many problems. First, the calibration work has extremely high requirements for personnel and can only be completed by the corresponding R&D personnel. Secondly, the entire calibration process is time-consuming and requires repeated experiments and judgments, which greatly increases the production cost of the equipment. Moreover, due to manual operation, it is difficult to ensure the uniformity of the control firmware, which is not conducive to the large-scale mass production of equipment.

[0005] Through searching patent documents, it was found that the invention patent with publication number CN106505975A discloses an automatic frequency calibration algorithm for an electrically tunable filter. The algorithm first detects the center frequency and passband bandwidth of the electrically tunable filter, and then rotates the stepper motor according to the calibration frequency and the current center frequency and passband bandwidth of the electrically tunable filter to calibrate the electrically tunable filter; during calibration, the output signal level of the electrically tunable filter is detected; finally, the frequency calibration result is confirmed according to the amplitude-frequency curve of the electrically tunable filter. The patent lacks multi-unit coordinated calibration, which makes the calibration process cumbersome and time-consuming, and reduces the overall calibration efficiency.

[0006] In summary, in view of the above-mentioned problems of the prior art, studying a system and method for automatic calibration of parameters of an electrically tunable filter of a wireless communication terminal has become a key task that needs to be solved urgently. Summary of the invention

[0007] In view of the defects in the prior art, the object of the present invention is to provide a system and method for automatically calibrating parameters of an electrically tunable filter of a wireless communication terminal.

[0008] According to the present invention, a wireless communication terminal electrically adjustable filter parameter automatic calibration system includes a hardware body and software firmware;

[0009] The hardware body includes a target terminal device to be calibrated and a computer supporting a universal instrument interface. The target terminal device and the computer are interconnected through a computer universal interface. A cable is used to connect a transmission signal output port and a reception signal input port of the target terminal device.

[0010] The firmware includes a target terminal device remote control unit, a target terminal device control unit and a calibration control unit. The target terminal device remote control unit calls a computer universal interface to connect to and remotely control the target terminal device, and controls the target terminal device to complete the upper-level actions in the calibration process; the target terminal device control unit runs in the target terminal device to realize the inherent functions of the target terminal device; the calibration control unit runs in the underlying controller of the target terminal device, seamlessly adds the functional firmware of the target terminal device, and controls the target terminal device to complete all underlying actions.

[0011] Preferably, the universal computer interface includes a 232 serial port, a USB serial port and an Ethernet port.

[0012] Preferably, the functional logic processing core of the target terminal device includes an upper-layer processor ARM and a bottom-layer controller FPGA. The upper-layer processor ARM has an upper-layer remote control serial port, and the bottom-layer controller FPGA has a bottom-layer debugging serial port. The target terminal device is interconnected with the computer through a USB serial port or a 232 serial port.

[0013] Preferably, the target terminal device remote control unit, the target terminal device control unit and the calibration control unit cooperate with each other in a predetermined sequence to control the reasonable operation of the hardware body, calibrate the optimal electrically tunable filter parameters corresponding to the transceiver frequency in the target terminal device, and automatically store the optimal electrically tunable filter parameters in the dedicated electrically tunable filter parameter ROM in the target terminal device board.

[0014] The present invention also provides a method for automatically calibrating parameters of an electrically adjustable filter of a wireless communication terminal, comprising the following steps:

[0015] Step S1, developing an electrically adjustable filter parameter calibration control unit, i.e., a soft firmware, running in the underlying controller of the target terminal device, and downloading the underlying controller firmware after completing the cable connection between the transmission signal output port and the reception signal input port of the target terminal device;

[0016] In step S2, the production personnel sends instructions to the remote control unit of the target terminal device through the serial port, and the calibration control unit starts to calibrate the electrically tunable filter parameters of each receiving and transmitting frequency, and automatically stores the electrically tunable filter parameters in a dedicated electrically tunable filter parameter ROM in the board of the target terminal device. Then, the calibration control unit uploads the electrically tunable filter parameters stored in the electrically tunable filter parameter ROM to the remote control unit.

[0017] Preferably, step S2 includes the following sub-steps:

[0018] Step S2.1, before the calibration process starts, the production staff sends a start command through the serial port in the computer and sets the parameter indicators for this calibration;

[0019] Step S2.2, under the operation of the target terminal device calibration control unit, the target terminal device starts calibration according to the frequency set in the transceiver frequency table. In each single-frequency calibration process, the target terminal device control unit collects test feedback information and transmits it to the calibration control unit. After multiple interactive feedbacks, the target terminal device control unit and the calibration control unit traverse the value range of the electric adjustment filter parameters, calibrate the optimal electric adjustment filter parameter value corresponding to the current frequency, and store it in the electric adjustment filter parameter ROM.

[0020] Preferably, in step S2.1, the parameter indicators include the upper and lower frequency limits and the frequency interval of this calibration.

[0021] Preferably, step S2.2 includes the following sub-steps:

[0022] Step S2.2.1, the calibration control unit sends the control parameters to the target terminal device control unit. Different control parameters affect each other to achieve different calibration accuracies. The target terminal device control unit receives the parameter indicators. At the same time, the calibration control unit is in the underlying controller of the target terminal device and is seamlessly embedded in the original functional firmware of the target terminal device. The calibration control unit cooperates with the target terminal device control unit to complete the underlying operations of the system calibration.

[0023] Step S2.2.2, after the remote control unit of the target terminal device receives the instruction issued by the production personnel, it uses the upper remote control serial port to communicate with the upper processor (ARM), remotely controls the target terminal device to perform basic settings, and at the same time, the calibration control unit issues a single-frequency transmission instruction and a single-frequency stop transmission instruction based on the feedback from the control unit of the target terminal device, so that the target terminal device sends and receives signals at a fixed frequency interval according to the calibration rules, and starts the calibration process;

[0024] Step S2.2.3, in the excitation state, the calibration control unit sends down parameters to set the frequency, amplitude, phase, etc., and then gives the transmission signal corresponding to the current frequency and enters the filter parameter setting state;

[0025] Step S2.2.4, in the filter parameter setting state, set the value range of the electrically adjustable filter according to the transmission frequency and the characteristics of the electrically adjustable filter. After the setting is completed, enter the trigger test state. In the trigger test state, the control unit of the target terminal device collects the transmission signal and calculates the average value of the Rssi received signal strength. After receiving the test completion signal, enter the feedback judgment state;

[0026] Step S2.2.5, the calibration control unit controls the target terminal device control unit to send a fixed frequency signal. When the transmitted signal is stable, the target terminal device control unit is controlled to receive the transmitted signal and calculate the Rssi received signal strength average value as the judgment criterion. At this time, the feedback judgment state is entered, and the Rssi received signal strength average value corresponding to the current electrically tunable filter parameter value is compared with the Rssi received signal strength average value corresponding to the existing optimal electrically tunable filter parameter value. The larger Rssi received signal strength average value is selected as the optimal Rssi received signal strength average value. The electrically tunable filter parameter value corresponding to the optimal Rssi received signal strength average value is the optimal electrically tunable filter parameter value.

[0027] Step S2.2.6, if the parameter value of the electrically adjustable filter has not reached the maximum value, then enter the filter parameter adjustment state, increase the minimum step value based on the current electrically adjustable filter parameter value, and after the electrically adjustable filter parameter adjustment is completed, then enter the filter parameter setting state, trigger test state, feedback judgment state again, and cycle multiple times until the feedback judgment state determines that the parameter value of the electrically adjustable filter has reached the maximum value, that is, after traversing the value range of the electrically adjustable filter, enter the single-frequency completion state;

[0028] Step S2.2.7, in the single-frequency completion state, the optimal electronically adjustable filter parameter value is stored in the storage address corresponding to the corresponding frequency. After the electronically adjustable filter parameter storage is completed, the parameter configuration state is entered. In the parameter configuration state, the frequency is changed according to the calibration parameters and a single-frequency transmission instruction is issued. Then, steps S2.2.1 to S2.2.6 are repeated until all frequency points are calibrated;

[0029] Step S2.2.8, the target terminal device remote control unit, the target terminal device control unit and the calibration control unit perform timing coordination.

[0030] Preferably, in step S2.2.1, after the system is reset, the state machine enters the parameter configuration state. In the parameter configuration state, if the calibration control unit receives a parameter configuration instruction from the remote control unit of the target terminal device, it passes the parameters to complete the parameter configuration; if it receives a start calibration instruction from the remote control unit of the target terminal device, it sends a single-frequency transmission instruction to enter the excitation state and start the single-frequency electrically adjustable filter parameter correction.

[0031] Preferably, step S2.2.8 includes the following sub-steps:

[0032] Step S2.2.8.1, the remote control unit of the target terminal device sends control instructions to set parameters and enter the test.

[0033] Step S2.2.8.2, the calibration control unit cyclically issues single-frequency transmission instructions. After each single-frequency transmission instruction is given, the target terminal device control unit collects and calculates the average value of the Rssi received signal strength, and feeds it back to the calibration control unit. The calibration control unit adjusts the parameters according to the average value of the Rssi received signal strength.

[0034] Step S2.2.8.3, repeat step S2.2.8.2 until the test calibration of this single frequency is completed.

[0035] Step S2.2.8.4, after all frequency calibration is completed, the target terminal device gives an end instruction and uploads the calibrated electronically controlled filter parameters to the remote control unit of the target terminal device.

[0036] Compared with the prior art, the present invention has the following beneficial effects:

[0037] 1. The present invention can automatically calibrate the unique electrically tunable filter parameters of each target terminal device after the circuit state and structural state are fixed. This parameter is the actual value in engineering practice and can accurately reflect the filtering performance of the device. Based on this data, the controller accurately matches the center frequency of the electrically tunable filter with the transceiver frequency, thereby improving the anti-interference ability and sensitivity of the wireless communication terminal.

[0038] 2. The present invention uses software and firmware in conjunction with hardware operations to replace the tedious and repetitive work of R&D personnel, and realizes the automatic calibration of the parameters of the electrically adjustable filter of the target terminal equipment. It not only reduces the calibration time of a single device, but also requires simple monitoring by production personnel during the production process. One production personnel can monitor the automatic operation of multiple systems at the same time, greatly reducing the manpower and time costs of equipment production.

[0039] 3. The present invention adopts a special electrically tunable filter parameter ROM to store the calibrated electrically tunable filter parameters of the target terminal device. By storing differentiated data in the electrically tunable filter parameter ROM for the underlying controller to call, the unified control firmware of the underlying controller of the same model product is ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0041] Figure 1 is a block diagram of the system hardware platform in an embodiment of the present invention;

[0042] Figure 2 This is a diagram of the information interaction interface between the target terminal device and the computer in an embodiment of the present invention;

[0043] Figure 3 Schematic diagram of the main state machine of the calibration control unit in the embodiment of the present invention;

[0044] Figure 4 It is a schematic diagram of the coordination process of system units in an embodiment of the present invention. DETAILED DESCRIPTION

[0045] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several changes and improvements can also be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0046] Embodiment 1:

[0047] This embodiment provides a system for automatically calibrating parameters of an electrically adjustable filter of a wireless communication terminal, including: a hardware body and software firmware.

[0048] The hardware includes the target terminal device to be calibrated and a computer that supports the universal instrument interface. The target terminal device and the computer are interconnected through the universal computer interface. A cable is used to connect the transmission signal output port and the reception signal input port of the target terminal device. In this way, a signal self-circulation loop is constructed to realize the self-reception and self-transmission of the target terminal device.

[0049] Specifically, the general computer interfaces include 232 serial ports, USB serial ports, and Ethernet ports.

[0050] Figure 1 4 is a block diagram of the system hardware platform in an embodiment of the present invention.

[0051] like Figure 1 As shown, the functional logic processing core of the target terminal device includes an upper-layer processor ARM and a bottom-layer controller FPGA. The upper-layer processor ARM has an upper-layer remote control serial port, and the bottom-layer controller FPGA has a bottom-layer debugging serial port. The target terminal device is interconnected with the computer through a USB serial port or a 232 serial port.

[0052] The software firmware includes a target terminal device remote control unit, a target terminal device control unit and a calibration control unit.

[0053] The target terminal device remote control unit calls the computer universal interface to connect and remotely control the target terminal device, and controls the target terminal device to complete the upper-level actions in the calibration process.

[0054] The target terminal device control unit runs in the target terminal device to realize the inherent functions of the target terminal device.

[0055] The calibration control unit runs in the underlying controller of the target terminal device, seamlessly adds the functional firmware of the target terminal device, and controls the target terminal device to complete all underlying actions;

[0056] The target terminal equipment remote control unit, the target terminal equipment control unit and the calibration control unit cooperate with each other in a predetermined sequence to control the reasonable operation of the hardware body, calibrate the optimal electronically tunable filter parameters corresponding to the receiving and transmitting frequencies in the target terminal equipment, and automatically store the optimal electronically tunable filter parameters in the dedicated electronically tunable filter parameter ROM in the target terminal equipment board.

[0057] The realization of the system calibration function of this embodiment relies on the coordinated work of the target terminal device to be calibrated and the computer according to a specific control timing, so multiple levels of software and firmware are required to complete the construction and calculation of the entire timing architecture.

[0058] Embodiment 2:

[0059] This embodiment provides a method for automatically calibrating parameters of an electrically tunable filter of a wireless communication terminal, which uses the automatic calibration system for electrically tunable filter parameters of a wireless communication terminal described in the above embodiment 1, and includes the following steps:

[0060] Step S1, develop an electrically tunable filter parameter calibration control unit, i.e., software firmware, running in the underlying controller (FPGA) of the target terminal device, and download the underlying controller firmware after completing the cable connection between the transmit signal output port and the receive signal input port of the target terminal device.

[0061] In step S2, the production personnel sends instructions to the remote control unit of the target terminal device through the serial port, and the calibration control unit starts to calibrate the electrically tunable filter parameters of each receiving and transmitting frequency, and automatically stores the electrically tunable filter parameters in a dedicated electrically tunable filter parameter ROM in the board of the target terminal device. Then, the calibration control unit uploads the electrically tunable filter parameters stored in the electrically tunable filter parameter ROM to the remote control unit.

[0062] Specifically, step S2 includes the following sub-steps:

[0063] Step S2.1, before the calibration process starts, the production staff sends a start command through the serial port in the computer and sets the parameter indicators for this calibration.

[0064] Figure 2 This is a diagram of the information interaction interface between the target terminal device and the computer in an embodiment of the present invention.

[0065] like Figure 2 As shown, the parameter indicators include the upper and lower frequency limits and frequency interval of this calibration.

[0066] Step S2.2, under the operation of the target terminal device calibration control unit, the target terminal device starts calibration according to the frequency set in the transceiver frequency table. In each single-frequency calibration process, the target terminal device control unit collects test feedback information and transmits it to the calibration control unit. After multiple interactive feedbacks, the target terminal device control unit and the calibration control unit traverse the value range of the electric adjustment filter parameters, calibrate the optimal electric adjustment filter parameter value corresponding to the current frequency, and store it in the electric adjustment filter parameter ROM.

[0067] More specifically, step S2.2 includes the following sub-steps:

[0068] Step S2.2.1, the calibration control unit sends the control parameters to the target terminal device control unit. Different control parameters affect each other to achieve different calibration accuracies. The target terminal device control unit receives the parameter indicators. At the same time, the calibration control unit is in the underlying controller (FPGA) of the target terminal device and is seamlessly embedded in the original functional firmware of the target terminal device. The calibration control unit collaborates with the target terminal device control unit to complete the underlying operations of the system calibration.

[0069] Figure 3 Schematic diagram of the main state machine of the calibration control unit in an embodiment of the present invention.

[0070] like Figure 3 As shown, after the system is reset, the state machine enters the parameter configuration state. In the parameter configuration state, if the calibration control unit receives a parameter configuration instruction from the remote control unit of the target terminal device, it passes the parameters to complete the parameter configuration; if it receives a start calibration instruction from the remote control unit of the target terminal device, it sends a single-frequency transmission instruction to enter the excitation state and start the single-frequency electronically adjustable filter parameter correction.

[0071] Step S2.2.2: After the remote control unit of the target terminal device receives the instruction issued by the production personnel, it uses the upper-level remote control serial port to communicate with the upper-level processor (ARM) to remotely control the target terminal device to perform basic settings. At the same time, the calibration control unit issues a single-frequency transmission instruction and a single-frequency stop transmission instruction based on the feedback from the control unit of the target terminal device, so that the target terminal device sends and receives signals at a fixed frequency interval according to the calibration rules, thereby starting the calibration process.

[0072] Step S2.2.3, in the excitation state, the calibration control unit sends parameters to set the frequency, amplitude, phase, etc., and then gives the transmission signal corresponding to the current frequency and enters the filter parameter setting state.

[0073] Step S2.2.4, in the filter parameter setting state, set the value range of the electronically adjustable filter according to the transmission frequency and the characteristics of the electronically adjustable filter. After the setting is completed, enter the trigger test state. In the trigger test state, the control unit of the target terminal device collects the transmission signal and calculates the average Rssi received signal strength. After receiving the test completion signal, it enters the feedback judgment state.

[0074] Step S2.2.5, the calibration control unit controls the target terminal device control unit to send a signal of a fixed frequency. When the transmitted signal is stable, the target terminal device control unit is controlled to receive the transmitted signal and calculate the Rssi received signal strength average value as a criterion. At this time, the feedback judgment state is entered, and the Rssi received signal strength average value corresponding to the current electrically adjustable filter parameter value is compared with the Rssi received signal strength average value corresponding to the existing optimal electrically adjustable filter parameter value. The larger Rssi received signal strength average value is selected as the optimal Rssi received signal strength average value, and the electrically adjustable filter parameter value corresponding to the optimal Rssi received signal strength average value is the optimal electrically adjustable filter parameter value.

[0075] Step S2.2.6, if the parameter value of the electrically adjustable filter has not reached the maximum value, enter the filter parameter adjustment state, increase the minimum step value based on the current electrically adjustable filter parameter value, and after the electrically adjustable filter parameter adjustment is completed, then enter the filter parameter setting state, trigger test state, and feedback judgment state again, and cycle multiple times until the feedback judgment state determines that the parameter value of the electrically adjustable filter has reached the maximum value, that is, after traversing the value range of the electrically adjustable filter, enter the single-frequency completion state.

[0076] Step S2.2.7, in the single-frequency completion state, store the optimal electronically adjustable filter parameter value to the storage address corresponding to the corresponding frequency. After the electronically adjustable filter parameter storage is completed, enter the parameter configuration state. In the parameter configuration state, change the frequency according to the calibration parameters and issue a single-frequency transmission instruction. Then repeat steps S2.2.1 to S2.2.6 until all frequency points are calibrated.

[0077] Step S2.2.8, the target terminal device remote control unit, the target terminal device control unit and the calibration control unit perform timing coordination.

[0078] Figure 4 It is a schematic diagram of the coordination process of system units in an embodiment of the present invention.

[0079] like Figure 4 As shown, step S2.2.8 includes the following sub-steps:

[0080] Step S2.2.8.1, the remote control unit of the target terminal device sends control instructions to set parameters and enter the test.

[0081] Step S2.2.8.2, the calibration control unit cyclically issues single-frequency transmission instructions. After each single-frequency transmission instruction is given, the target terminal device control unit collects and calculates the average value of the Rssi received signal strength, and feeds it back to the calibration control unit. The calibration control unit adjusts the parameters according to the average value of the Rssi received signal strength.

[0082] Step S2.2.8.3, repeat step S2.2.8.2 until the test calibration of this single frequency is completed.

[0083] Step S2.2.8.4, after all frequency calibration is completed, the target terminal device gives an end instruction and uploads the calibrated electronically controlled filter parameters to the remote control unit of the target terminal device.

[0084] Those skilled in the art know that, in addition to realizing the system and its various devices, modules, and units provided by the present invention in a purely computer-readable program code, it is entirely possible to realize the same functions in the form of logic gates, switches, application-specific integrated circuits, programmable logic controllers, and embedded microcontrollers by logically programming the method steps. Therefore, the system and its various devices, modules, and units provided by the present invention can be considered as a hardware component, and the devices, modules, and units included therein for realizing various functions can also be regarded as structures within the hardware component; the devices, modules, and units for realizing various functions can also be regarded as both software modules for realizing the method and structures within the hardware component.

[0085] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. A wireless communication terminal electronically tunable filter parameter automatic calibration system, characterized in that: Including hardware body and software firmware; The hardware body includes a target terminal device to be calibrated and a computer supporting a universal instrument interface, wherein the target terminal device and the computer are interconnected via a computer universal interface; a transmission signal output port and a reception signal input port of the target terminal device are connected by a cable; The firmware includes a target terminal device remote control unit, a target terminal device control unit and a calibration control unit. The target terminal device remote control unit calls the computer universal interface to connect and remotely control the target terminal device, and controls the target terminal device to complete the upper-level actions in the calibration process; the target terminal device control unit runs in the target terminal device to realize the inherent functions of the target terminal device; the calibration control unit runs in the underlying controller of the target terminal device, seamlessly adds the functional firmware of the target terminal device, and controls the target terminal device to complete all underlying actions.

2. The automatic calibration system for electronically tunable filter parameters of a wireless communication terminal according to claim 1, characterized in that: The computer universal interface includes 232 serial port, USB serial port and Ethernet port.

3. The automatic calibration system for electronically tunable filter parameters of a wireless communication terminal according to claim 1, characterized in that: The functional logic processing core of the target terminal device includes an upper processor ARM and a bottom controller FPGA. The upper processor ARM has an upper remote control serial port, and the bottom controller FPGA has a bottom debugging serial port. The target terminal device is interconnected with the computer through a USB serial port or a 232 serial port.

4. The automatic calibration system for electronically tunable filter parameters of a wireless communication terminal according to claim 1, characterized in that: The target terminal device remote control unit, the target terminal device control unit and the calibration control unit cooperate with each other in a predetermined sequence to control the reasonable operation of the hardware body, calibrate the optimal electrical adjustment filter parameters corresponding to the transceiver frequency in the target terminal device, and automatically store the optimal electrical adjustment filter parameters in the dedicated electrical adjustment filter parameter ROM in the target terminal device board.

5. A method for automatically calibrating parameters of an electrically tunable filter of a wireless communication terminal, using a system for automatically calibrating parameters of an electrically tunable filter of a wireless communication terminal according to any one of claims 1 to 4, characterized in that: The steps include: Step S1, developing an electrically adjustable filter parameter calibration control unit, i.e., a soft firmware, running in the underlying controller of the target terminal device, and downloading the underlying controller firmware after completing the cable connection between the transmission signal output port and the reception signal input port of the target terminal device; In step S2, the production personnel sends instructions to the remote control unit of the target terminal device through the serial port, and the calibration control unit starts to calibrate the electrically tunable filter parameters of each receiving and transmitting frequency, and automatically stores the electrically tunable filter parameters in a dedicated electrically tunable filter parameter ROM in the board of the target terminal device. Then, the calibration control unit uploads the electrically tunable filter parameters stored in the electrically tunable filter parameter ROM to the remote control unit.

6. A method for automatically calibrating parameters of an electrically tunable filter of a wireless communication terminal according to claim 5, characterized in that: The step S2 comprises the following sub-steps: Step S2.1, before the calibration process starts, the production staff sends a start command through the serial port in the computer and sets the parameter indicators for this calibration; Step S2.2, under the operation of the target terminal device calibration control unit, the target terminal device starts calibration according to the frequency set in the transceiver frequency table. In each single-frequency calibration process, the target terminal device control unit collects test feedback information and transmits it to the calibration control unit. The target terminal device control unit and the calibration control unit cooperate through multiple interactive feedbacks, traverse the value range of the electric adjustment filter parameters, calibrate the optimal electric adjustment filter parameter value corresponding to the current frequency, and store it in the electric adjustment filter parameter ROM.

7. A method for automatically calibrating parameters of an electrically tunable filter of a wireless communication terminal according to claim 6, characterized in that: In the step S2.1, the parameter indicators include the upper and lower frequency limits and the frequency interval of this calibration.

8. The method for automatically calibrating parameters of an electrically tunable filter of a wireless communication terminal according to claim 6, characterized in that: The step S2.2 includes the following sub-steps: Step S2.2.1, the calibration control unit sends the control parameters to the target terminal device control unit, different control parameters affect each other to achieve different calibration accuracies, the target terminal device control unit receives the parameter indicators, and at the same time, the calibration control unit is in the underlying controller of the target terminal device, and is seamlessly embedded in the original functional firmware of the target terminal device. The calibration control unit cooperates with the target terminal device control unit to complete the underlying operations of the system calibration; Step S2.2.2, after receiving the instruction from the production personnel, the remote control unit of the target terminal device uses the upper remote control serial port to communicate with the upper processor (ARM), remotely controls the target terminal device to perform basic settings, and at the same time, the calibration control unit issues a single-frequency transmission instruction and a single-frequency stop transmission instruction according to the feedback from the control unit of the target terminal device, so that the target terminal device sends and receives signals at a fixed frequency interval according to the calibration rules, and starts the calibration process; Step S2.2.3, in the excitation state, the calibration control unit sends down parameters to set the frequency, amplitude, phase, etc., and then gives the transmission signal corresponding to the current frequency and enters the filter parameter setting state; Step S2.2.4, in the filter parameter setting state, set the value range of the electrically adjustable filter according to the transmission frequency and the characteristics of the electrically adjustable filter. After the setting is completed, enter the trigger test state. In the trigger test state, the control unit of the target terminal device collects the transmission signal and calculates the average value of the Rssi received signal strength. After receiving the test completion signal, enter the feedback judgment state; Step S2.2.5, the calibration control unit controls the target terminal device control unit to send a fixed frequency signal. When the transmitted signal is stable, the target terminal device control unit is controlled to receive the transmitted signal and calculate the Rssi received signal strength average value as the judgment criterion. At this time, the feedback judgment state is entered, and the Rssi received signal strength average value corresponding to the current electrically tunable filter parameter value is compared with the Rssi received signal strength average value corresponding to the existing optimal electrically tunable filter parameter value. The larger Rssi received signal strength average value is selected as the optimal Rssi received signal strength average value. The electrically tunable filter parameter value corresponding to the optimal Rssi received signal strength average value is the optimal electrically tunable filter parameter value. Step S2.2.6, if the parameter value of the electrically adjustable filter has not reached the maximum value, then enter the filter parameter adjustment state, increase the minimum step value based on the current electrically adjustable filter parameter value, and after the electrically adjustable filter parameter adjustment is completed, then enter the filter parameter setting state, trigger test state, feedback judgment state again, and cycle multiple times until the feedback judgment state determines that the parameter value of the electrically adjustable filter has reached the maximum value, that is, after traversing the value range of the electrically adjustable filter, enter the single-frequency completion state; Step S2.2.7, in the single-frequency completion state, the optimal electronically adjustable filter parameter value is stored in the storage address corresponding to the corresponding frequency. After the electronically adjustable filter parameter storage is completed, the parameter configuration state is entered. In the parameter configuration state, the frequency is changed according to the calibration parameters and a single-frequency transmission instruction is issued. Then, steps S2.2.1 to S2.2.6 are repeated until all frequency points are calibrated; Step S2.2.8, the target terminal device remote control unit, the target terminal device control unit and the calibration control unit perform timing coordination.

9. The method for automatically calibrating parameters of an electrically tunable filter of a wireless communication terminal according to claim 8, characterized in that: In the step S2.2.1, after the system is reset, the state machine enters the parameter configuration state. In the parameter configuration state, if the calibration control unit receives a parameter configuration instruction from the remote control unit of the target terminal device, it passes the parameters to complete the parameter configuration; if it receives a start calibration instruction from the remote control unit of the target terminal device, it sends a single-frequency transmission instruction to enter the excitation state and start the single-frequency electrically adjustable filter parameter correction.

10. The method for automatically calibrating parameters of an electrically tunable filter of a wireless communication terminal according to claim 8, characterized in that: The step S2.2.8 includes the following sub-steps: Step S2.2.8.1, the remote control unit of the target terminal device sends control instructions to set parameters and enter the test; Step S2.2.8.2, the calibration control unit cyclically issues single-frequency transmission instructions. After each single-frequency transmission instruction is issued, the target terminal device control unit collects and calculates the average value of the Rssi received signal strength, and feeds it back to the calibration control unit. The calibration control unit adjusts the parameters according to the average value of the Rssi received signal strength; Step S2.2.8.3, repeating step S2.2.8.2 until the test calibration of this single frequency is completed; Step S2.2.8.4, after all frequency calibration is completed, the target terminal device gives an end instruction and uploads the calibrated electronically controlled filter parameters to the remote control unit of the target terminal device.

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