CN106941382B - Self-calibration implementation method and device of radio frequency matrix switch - Google Patents
Self-calibration implementation method and device of radio frequency matrix switch Download PDFInfo
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- H04B17/11—Monitoring; Testing of transmitters for calibration
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Abstract
The invention discloses a self-calibration implementation method of a radio frequency matrix switch, which comprises the following steps: acquiring a radio frequency signal output by a radio frequency phase-locked loop (PLL); detecting the power of the output radio frequency signal, and reading a Received Signal Strength Indication (RSSI) value detected on a radio frequency receiving channel of a radio frequency matrix switch; and comparing the detected RSSI value on each channel with the reference value of the corresponding frequency point, and determining that the self calibration of the corresponding channel under the current frequency is finished when the absolute value of the difference value of the RSSI value and the reference value is smaller than a preset first threshold value. The invention also discloses a self-calibration implementation device of the radio frequency matrix switch.
Description
Technical Field
The invention relates to a test instrument implementation technology in the field of wireless communication, in particular to a self-calibration implementation method and device of a radio frequency matrix switch.
Background
In the current mobile communication network, due to the design requirements of network specifications and networking, Radio Remote Units (RRUs) in the wireless communication system are all in a multi-transmission multi-reception mode, which brings complicated procedures to calibration and Radio performance test of the RRUs in the factory process, for example: the RRU is tested by adopting a manual wire changing mode, so that the efficiency is low, production batch reworking caused by misoperation is very easy to occur, the requirement of batch delivery cannot be met, and the development of a wireless communication technology under a new situation is not adapted, so that a radio frequency matrix switch or other devices are required to be found for realizing the aim of automatic testing.
Currently, the common practice for calibrating and testing RRUs is: by means of power dividers or combiners, such as: a 1-division-8 power divider or an 8-in-1 combiner adopts a method of separating an uplink test and a downlink test, as shown in fig. 1 and 2. The method needs to add a testing procedure, not only has low efficiency, but also is easy to have the phenomenon of disordered manufacturing procedures. Meanwhile, the standing wave difference and the isolation index of each channel port of the power divider or the combiner cannot meet the limit of the test requirement, so that the application place is limited and the popularization is not realized.
However, a more advanced technical solution in the prior art is: the radio frequency matrix switch is used for realizing automatic testing, as shown in fig. 3, the radio frequency matrix switch is applied to a testing environment of the RRU, and the instrument and the tested piece are controlled through background testing software to form an automatic testing platform. Compared with the method shown in fig. 1 and 2, the method shown in fig. 3 is advanced and generalizable, but the radio frequency matrix switch in the conventional sense has a large cost price difference due to different assembling modes of the internal coaxial switches. For example: the topological connection mode of the internal coaxial switches of the common 12-port full-matrix radio frequency switch is shown in fig. 4, and the connection needs 14 1 × 2 coaxial switches and 4 1 × 6 coaxial switches to form a three-level coaxial switch cascade mode. Standing waves, channel insertion loss, channel isolation and phase difference of each port of the radio frequency matrix switch assembled by the method can reach ideal indexes, and the radio frequency matrix switch is suitable for testing a tested piece with no more than 12 ports; however, the number of coaxial switches adopted by the cascade connection mode is large, the occupied space is large, the internal wiring is complex, and the cost is high.
Meanwhile, the existing radio frequency matrix switch only has the function of switching different channels, so that the aim of automatic testing can be achieved, the calibration and maintenance of the radio frequency matrix switch are not considered, the function is single, the calibration process of the radio frequency matrix switch is complicated, and whether each channel index of the radio frequency matrix switch is normal can be judged only by means of instruments such as an external vector network analyzer, a signal source or a frequency spectrograph. Moreover, a user cannot obtain the working condition of the coaxial switch in the radio frequency matrix switch to judge whether the performance of the radio frequency matrix switch is normal or not and whether the device needs to be disassembled or not, which brings great inconvenience to the maintenance of the instrument in the using process.
Disclosure of Invention
In view of this, embodiments of the present invention are expected to provide a self-calibration implementation method and apparatus for a radio frequency matrix switch, which can implement an intelligent radio frequency matrix switch that is self-calibrated and easy to maintain.
In order to achieve the above purpose, the technical solution of the embodiment of the present invention is realized as follows:
the embodiment of the invention provides a self-calibration implementation method of a radio frequency matrix switch, which comprises the following steps:
acquiring a radio frequency signal output by a Phase Locking Loop (PLL);
detecting the power of the output radio frequency Signal, and reading a Received Signal Strength Indication (RSSI) value detected on a radio frequency receiving channel of the radio frequency matrix switch;
and comparing the detected RSSI value on each channel with the reference value of the corresponding frequency point, and determining that the self calibration of the corresponding channel under the current frequency is finished when the absolute value of the difference value of the RSSI value and the reference value is smaller than a preset first threshold value.
In the above scheme, the radio frequency matrix switch includes 14 coaxial switches; the 14 coaxial switches comprise 12 1-in-2 switches and 2 1-in-12 switches, and a two-stage cascade mode is formed.
In the above scheme, the method further comprises: and distributing a register address to each coaxial switch, and recording the switching times of the corresponding coaxial switch in real time according to the change of the distributed register address value.
In the above solution, each path of the coaxial switch includes a driving circuit;
the method further comprises the following steps: the driving circuit provides voltage and current required by work for the coaxial switch and assists the coaxial switch to realize the opening and closing of a channel.
In the above scheme, the reference clock when the PLL operates is a 10MHz clock signal, and the frequency range of the output rf signal is 100MHz to 3.5 GHz;
the first threshold value is set according to the loss of the radio frequency cable and the channel insertion loss of the radio frequency matrix switch.
The embodiment of the invention also provides a self-calibration implementation device of the radio frequency matrix switch, which comprises:
the acquisition module is used for acquiring the radio frequency signal output by the PLL;
the detection reading module is used for detecting the power of the output radio frequency signal and reading an RSSI value detected on a radio frequency receiving channel of the radio frequency matrix switch;
and the self-calibration judging module is used for comparing the detected RSSI value on each channel with the reference value of the corresponding frequency point, and when the absolute value of the difference value of the RSSI value and the reference value is smaller than a preset first threshold value, determining that the self-calibration of the corresponding channel under the current frequency is completed.
In the above scheme, the radio frequency matrix switch includes 14 coaxial switches; the 14 coaxial switches comprise 12 1-in-2 switches and 2 1-in-12 switches, and a two-stage cascade mode is formed.
In the above scheme, the apparatus further comprises: the coaxial switch switching recording module is used for distributing a register address to each coaxial switch and recording the switching times of the corresponding coaxial switch in real time according to the change of the distributed register address value.
In the above scheme, the apparatus further comprises: and the coaxial switch driving module is used for driving each path of the coaxial switch so as to provide voltage and current required by the operation of the coaxial switch and assist the coaxial switch in realizing the opening and closing of a channel.
In the above scheme, the reference clock when the PLL operates is a 10MHz clock signal, and the frequency range of the output rf signal is 100MHz to 3.5 GHz;
the first threshold value is set according to the loss of the radio frequency cable and the channel insertion loss of the radio frequency matrix switch.
The embodiment of the invention also provides a self-calibration radio frequency matrix switch, which comprises the self-calibration realization device of the radio frequency matrix switch.
The method and the device for realizing self-calibration of the radio frequency matrix switch, provided by the embodiment of the invention, are used for acquiring the radio frequency signal output by the PLL, detecting the power of the output radio frequency signal, reading the RSSI value detected on the radio frequency receiving channel of the radio frequency matrix switch, comparing the detected RSSI value on each channel with the reference value of the corresponding frequency point, and determining that the corresponding channel finishes self-calibration under the current frequency when the absolute value of the difference value of the two is smaller than the preset first threshold value. Therefore, the intelligent radio frequency matrix switch capable of self calibration and easy maintenance can be realized, and the problems of large number of coaxial switches, high cost, complicated calibration and maintenance processes and single function in the conventional 12-port radio frequency matrix switch are solved.
Furthermore, the radio frequency matrix switch of the embodiment of the invention adopts 14 coaxial switches to form a two-stage cascade mode, so that the adopted coaxial switches are least in number, the technical progress is achieved, the function is stronger, and the self-calibration effect of the radio frequency matrix switch is achieved; in addition, the user can also monitor the working condition of the coaxial switch in the radio frequency matrix switch in real time, can pertinently troubleshoot faults and is convenient for the user to maintain.
Drawings
Fig. 1 is a schematic diagram of a method for testing an RRU uplink by using a power divider in the prior art;
fig. 2 is a schematic diagram of a method for testing an RRU downlink by using a combiner in the prior art;
fig. 3 is a schematic diagram of a method for testing an RRU by using a radio frequency matrix switch in the prior art;
fig. 4 is a schematic view of a topological connection manner of an internal coaxial switch of a 2 × 12 port full-matrix rf switch in the prior art;
FIG. 5 is a schematic flow chart of a self-calibration implementation method of a radio frequency matrix switch according to an embodiment of the present invention;
fig. 6 is a schematic view of a topological connection manner of an internal coaxial switch of a 2 × 12 port radio frequency matrix switch according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a coaxial switch driving circuit according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of a self-calibrating RF transmit chain design according to an embodiment of the present invention;
FIG. 9 is a schematic diagram of a self-calibrating RF receive chain design according to an embodiment of the invention;
FIG. 10 is a schematic diagram of a specific process for self-calibration of a radio frequency matrix switch according to an embodiment of the present invention;
FIG. 11 is a first schematic diagram illustrating a self-calibration wiring of the RF matrix switch according to the embodiment of the invention;
FIG. 12 is a second schematic diagram of a self-calibration wiring of the RF matrix switch according to the embodiment of the invention;
fig. 13 is a schematic structural diagram of a self-calibration implementation apparatus of a radio frequency matrix switch according to an embodiment of the present invention.
Detailed Description
So that the manner in which the features and aspects of the embodiments of the present invention can be understood in detail, a more particular description of the embodiments of the invention, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings.
As shown in fig. 5, the self-calibration implementation process of the rf matrix switch in the embodiment of the present invention includes the following steps:
step 501: acquiring a radio frequency signal output by a PLL;
here, the reference clock when the PLL operates may be a 10MHz clock signal, and the frequency range of the output radio frequency signal is 100MHz to 3.5 GHz.
Here, the radio frequency matrix switch includes 14 coaxial switches; the 14 coaxial switches comprise 12 1-in-2 switches and 2 1-in-12 switches (respectively represented by 1 × 2 and 1 × 12), and form a two-stage cascade mode. The topological connection mode of the coaxial switch inside the 2 × 12 port radio frequency matrix switch designed by the embodiment of the invention is shown in fig. 6.
In the practical use process, the Transmission port and the Reflection port are used as a signal output port and an input port and are respectively connected to the radio frequency ports of the frequency spectrograph and the signal source. The ports 1 to 12 of the 1 × 12 switch with the number a are respectively connected to the J1 ports of the 12 1 × 2 switches, the ports 1 to 12 of the 1 × 12 switch with the number b are respectively connected to the J2 ports of the 12 1 × 2 switches, the COM ports of the 12 1 × 2 switches are respectively used as the ports 1 to 12 of the radio frequency matrix switch, and are respectively connected to the radio frequency ports of the tested piece in practical application. Therefore, port standing waves and channel insertion loss indexes of the radio frequency matrix switch can be decomposed to all levels of coaxial switches and radio frequency cables, and wireless indexes can meet design requirements:
the channel insertion loss is less than or equal to 2dB @4 GHz;
the standing wave of the port is less than or equal to 1.3@4 GHz;
the channel isolation is more than or equal to 100dB @4 GHz.
In addition, all the radio frequency cables can be designed to be equal in length so as to ensure that the phase difference of each channel of the radio frequency matrix switch is kept consistent, for example, the phase difference of all the channels in the range of 4GHz frequency band is less than 15 degrees, the coaxial switch topology connection in the mode can realize the function of the full-matrix radio frequency switch, completely meet the test requirements of the Radio Remote Unit (RRU) and the parts thereof, and the number of the adopted coaxial switches is minimum.
Here, the method further includes: and distributing a register address to each coaxial switch, and recording the switching times of the corresponding coaxial switch in real time according to the change of the distributed register address value.
Here, each of the coaxial switches includes a driving circuit; the method further comprises the following steps: the driving circuit provides voltage and current required by work for the coaxial switch and assists the coaxial switch to realize the opening and closing of a channel.
In the embodiment of the present invention, the coaxial switch driving circuit has a structure as shown in fig. 7, and a combination of an NPN triode and a P-channel enhancement MOSFET is adopted. Wherein, when the base of the NPN triode has current iBWhen the current passes through the NPN triode, the base current i passes through the NPN triodeBThe triode can be controlled to work in a saturation region, the voltage drop between the collector and the emitter is small, so that a negative voltage difference can be formed between a grid Gate and a Source of a P-channel MOSFET, the MOSFET is conducted, a Drain Drain of the MOSFET outputs a positive voltage and provides current required by a load, and one path corresponding to the coaxial switch is conducted.
Here, a Central Processing Unit (CPU) of the rf matrix switch may allocate a register address to each coaxial switch, and allocate 14 register addresses in total, where a value of each register is 16 bits wide, and each bit corresponds to one path of the coaxial switch. When the write register value is 0x01 (hexadecimal), the register value corresponds to the first path of NPN transistor conduction, that is, the first path of coaxial switch conduction. Similarly, when the write register value is 0x04, the fourth path of the corresponding coaxial switch is turned on. It should be noted that the register value written by the coaxial switch register address cannot have two or more bits corresponding to the binary number being 1 at the same time, otherwise the operating system will be affected to correctly decode the written value, because the written register value is invalid when the written register value has two or more bits being 1 at the same time. In addition, the maximum voltage difference between the source and the drain of the selected P-channel MOSFET and the maximum output current of the drain meet the working conditions of the load, so the type of the P-channel MOSFET needs to be selected reasonably.
Here, the voltage divider circuit composed of resistors R3 and R4 in the coaxial switch driving circuit should ensure that when the triode is turned on, a voltage difference V is formed between the gate and the source of the P-channel MOSFET tubegsThis V isgsThe value should meet the requirement of the conduction of the MOSFET. The capacitor C1 is used to delay the on-time of the MOSFET to prevent the MOSFET from outputting negative voltage at the drain when the MOSFET is turned on due to the excessive parasitic inductance when the Printed Circuit Board (PCB) is wired. Transistor-Transistor logic (TTL) levels required by the coaxial switch driving circuit can be provided by writing to a CPU internal register.
Step 502: detecting the power of the output radio frequency signal, and reading an RSSI value detected on a radio frequency receiving channel of a radio frequency matrix switch;
step 503: and comparing the detected RSSI value on each channel with the reference value of the corresponding frequency point, and determining that the self calibration of the corresponding channel under the current frequency is finished when the absolute value of the difference value of the RSSI value and the reference value is smaller than a preset first threshold value.
Here, the reference value of the corresponding frequency point is a standard value specified in a specification protocol; the first threshold value can be set according to the loss of the radio frequency cable and the channel insertion loss of the radio frequency matrix switch; since the loss of the rf cable is less than 1dB, and the insertion loss of all channels of the rf matrix switch is less than 2dB under normal conditions, the difference between the detected RSSI value on each channel and the reference value of the corresponding frequency point, i.e., the range of RSSIi-RSSI0(i is greater than or equal to 1 and less than or equal to the total number of channels) should be less than 3 dB.
The following further details the self-calibration process of the rf matrix switch according to the embodiment of the present invention:
the implementation of the rf matrix switch self-calibration unit adopts the framework shown in fig. 8 and fig. 9, where the rf matrix switch self-calibration unit includes an rf transmitting link part and an rf receiving link part, and an OCXO (Oven Controlled Crystal Oscillator) outputs a 10MHz clock signal as a reference clock when a PLL with a Voltage Controlled Oscillator (VCO) operates. The PLL can output radio frequency signals with the frequency of 100 MHz-3.5 GHz, the power can reach 10dBm at most, phase noise and high-order harmonic suppression of the output radio frequency signals meet requirements, and the 3dB pi network adjusts the output end of a transmitting link to be matched. In addition, the receiving link power detection device converts the radio frequency signal into a voltage signal, and an analog-to-digital (AD) conversion device converts the voltage signal into a digital signal.
The self-calibration process of the radio frequency matrix switch is shown in fig. 10, and the detailed implementation process is as follows:
step 1001: a user selects a self-calibration program on a touch screen, inputs a channel to be calibrated and conducts the channel;
such as: transmitting to a PORT1 channel, and at the moment, transmitting PORTs of the radio frequency matrix switch are conducted to a PORT1 channel;
step 1002: connecting a radio frequency transmitting channel with a receiving channel by using a radio frequency cable a;
here, as shown in FIG. 11, the PLL is configured by the processor to output a single tone signal in the frequency band of 100MHz to 3.5GHz with a power of-10 dBm. The receiving channel power detection device detects an input radio frequency signal, converts the input radio frequency signal into a voltage signal, outputs a digital signal after analog-to-digital conversion, and the processor reads the digital signal through a Serial Peripheral Interface (SPI) so as to calibrate the power detection chip in a frequency range of 100MHz to 3.5GHz, perform curve fitting and write table verification and ensure that the signal power detected in the frequency range is consistent with the power of an actual transmitted signal.
Step 1003: connecting a radio frequency cable b with a radio frequency matrix switch channel to ensure that a radio frequency signal is accessed;
here, one end of the rf receiving channel of the rf cable a is unscrewed and connected to the PORT1 PORT of the rf matrix switch, and both ends of the other rf cable b are connected to the Transmission PORT and the rf receiving RX channel of the rf matrix switch, respectively, so that the rf receiving channel has an rf signal input, as shown in fig. 12.
Step 1004: detecting the RSSI value of the channel to be calibrated at the frequency point to be calibrated, comparing the RSSI value with the reference value of the corresponding frequency point, and judging whether the calibration value is normal or not;
step 1005: and replacing the connection mode of the radio frequency cable, and sequentially calibrating other channels.
Specifically, a user inputs a frequency (or a certain frequency range) to be calibrated on a touch screen, reads a power RSSI1 value of a receiving channel, compares the power RSSI with a reference value RSSI0 of a corresponding frequency point, and completes self calibration of a Transmission PORT of the radio frequency matrix switch to a PORT of PORT1 under the current frequency if RSSI1-RSSI0 is less than 3 dB. Similarly, the other channels can be self-calibrated in turn, and when the RSSIi-RSSI0(i is greater than or equal to 1 and less than or equal to the total number of channels) of all the channels is less than the first threshold value, the self-calibration of the radio frequency matrix switch is passed.
After the self-calibration of each channel is completed, the switch mode power converter of the radio frequency self-calibration link is disabled, so that each device of the radio frequency matrix switch self-calibration unit does not work, the power consumption of a system device is saved, and the interference of clock higher harmonics to other circuits is prevented.
In practical application, the radio frequency matrix switch communicates with an external device through a Gigabit Ethernet (Gigabit Ethernet), when the radio frequency matrix switch is applied to an automatic test platform, background test software sends a channel switching command to the radio frequency matrix switch according to practical application requirements, a CPU decodes the command after receiving the command, analyzes a register address to be processed, writes a certain bit corresponding to a corresponding address into a binary system 1, and outputs a TTL high level through a General Purpose Input/Output (GPIO) port related to the CPU, so that a corresponding MOSFET tube driving circuit outputs a positive voltage, a coaxial radio frequency switch is switched on, and a display screen visually displays that a corresponding channel is switched on.
Here, each coaxial switch may be assigned a register address in advance in the memory, the initial value of the register address is 0, one coaxial switch is switched once, and 1 is added to the corresponding register value, so that the switching times of all coaxial switches can be recorded in real time, an early warning is provided for the coaxial switches close to or exceeding the service life, and the maintenance by the user is facilitated. The user can also visually check the current switching times of each coaxial switch through the touch display screen.
Here, the proximity or the exceeding of the lifetime of the coaxial switch can be calculated on the basis of the unit hour, and then the coaxial switch which is proximal to or exceeds the lifetime can be warned.
In order to implement the foregoing method, an embodiment of the present invention further provides a self-calibration implementation apparatus for a radio frequency matrix switch, as shown in fig. 13, the apparatus includes an obtaining module 130, a detection reading module 131, and a self-calibration determining module 132; wherein,
an obtaining module 130, configured to obtain a radio frequency signal output by the PLL;
a detection reading module 131, configured to detect the power of the output radio frequency signal, and read an RSSI value detected in a radio frequency receiving channel of the radio frequency matrix switch;
the self-calibration determining module 132 is configured to compare the detected RSSI value on each channel with a reference value of a corresponding frequency point, and determine that the self-calibration of the corresponding channel under the current frequency is completed when an absolute value of a difference between the two is smaller than a preset first threshold.
Here, the radio frequency matrix switch includes 14 coaxial switches; the 14 coaxial switches comprise 12 1-in-2 switches and 2 1-in-12 switches, and a two-stage cascade mode is formed.
The reference clock when the PLL works is a 10MHz clock signal, and the frequency range of the output radio frequency signal is 100 MHz-3.5 GHz; the first threshold is typically set according to the loss of the rf cable, and the channel insertion loss of the rf matrix switch, and may be 3 dB.
Wherein the apparatus further comprises: the coaxial switch switching recording module 133 is configured to allocate a register address to each coaxial switch, and record the switching times of the corresponding coaxial switch in real time according to a change in the allocated register address value;
and the coaxial switch driving module 134 is used for driving each path of the coaxial switch to provide voltage and current required by the operation of the coaxial switch and assist the coaxial switch to realize the opening and closing of the channel.
In practical applications, the obtaining module 130, the detecting and reading module 131, the self-calibration judging module 132, the coaxial switch switching recording module 133, and the coaxial switch driving module 134 may be implemented by a CPU, a Microprocessor (MPU), a Digital Signal Processor (DSP), a Field Programmable Gate Array (FPGA), or the like on a testing instrument.
The embodiment of the invention obtains the radio frequency signal output by the PLL, detects the power of the output radio frequency signal, reads the RSSI value detected on the radio frequency receiving channel of the radio frequency matrix switch, compares the RSSI value detected on each channel with the reference value of the corresponding frequency point, and determines that the self calibration of the corresponding channel under the current frequency is finished when the absolute value of the difference value of the RSSI value detected on each channel and the reference value of the corresponding frequency point is smaller than a preset first threshold value. Therefore, the intelligent radio frequency matrix switch capable of self calibration and easy maintenance can be realized, and the problems of large number of coaxial switches, high cost, complicated calibration and maintenance processes and single function in the conventional 12-port radio frequency matrix switch are solved.
Furthermore, the radio frequency matrix switch of the embodiment of the invention adopts 14 coaxial switches to form a two-stage cascade mode, so that the adopted coaxial switches are least in number, the technical progress is achieved, the function is stronger, and the self-calibration effect of the radio frequency matrix switch is achieved; in addition, the user can also monitor the working condition of the coaxial switch in the radio frequency matrix switch in real time, can pertinently troubleshoot faults and is convenient for the user to maintain.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, and any modifications, equivalents, improvements, etc. that are within the spirit and principle of the present invention should be included in the present invention.
Claims (11)
1. A self-calibration implementation method of a radio frequency matrix switch, the method comprising:
acquiring a radio frequency signal output by a radio frequency phase-locked loop (PLL);
detecting the power of the output radio frequency signal, and reading a Received Signal Strength Indicator (RSSI) value detected on a radio frequency receiving channel of a radio frequency matrix switch; the phase difference of each channel of the radio frequency matrix switch is consistent;
and comparing the detected RSSI value on each channel with the reference value of the corresponding frequency point, and determining that the self calibration of the corresponding channel under the current frequency is finished when the absolute value of the difference value of the RSSI value and the reference value is smaller than a preset first threshold value.
2. The method of claim 1, wherein the radio frequency matrix switch comprises 14 coaxial switches; the 14 coaxial switches comprise 12 1-in-2 switches and 2 1-in-12 switches, and a two-stage cascade mode is formed.
3. The method of claim 2, further comprising: and distributing a register address to each coaxial switch, and recording the switching times of the corresponding coaxial switch in real time according to the change of the distributed register address value.
4. The method of claim 2, wherein each lane of the coaxial switch comprises a drive circuit;
the method further comprises the following steps: the driving circuit provides voltage and current required by work for the coaxial switch and assists the coaxial switch to realize the opening and closing of a channel.
5. The method according to any one of claims 1 to 4, wherein the reference clock for operating the PLL is a 10MHz clock signal, and the frequency range of the output RF signal is 100MHz to 3.5 GHz;
the first threshold value is set according to the loss of the radio frequency cable and the channel insertion loss of the radio frequency matrix switch.
6. An apparatus for implementing self calibration of a radio frequency matrix switch, the apparatus comprising:
the acquisition module is used for acquiring a radio frequency signal output by a radio frequency phase-locked loop (PLL);
the detection reading module is used for detecting the power of the output radio frequency signal and reading a Received Signal Strength Indicator (RSSI) value detected on a radio frequency receiving channel of the radio frequency matrix switch; the phase difference of each channel of the radio frequency matrix switch is consistent;
and the self-calibration judging module is used for comparing the detected RSSI value on each channel with the reference value of the corresponding frequency point, and when the absolute value of the difference value of the RSSI value and the reference value is smaller than a preset first threshold value, determining that the self-calibration of the corresponding channel under the current frequency is completed.
7. The apparatus of claim 6, wherein the radio frequency matrix switch comprises 14 coaxial switches; the 14 coaxial switches comprise 12 1-in-2 switches and 2 1-in-12 switches, and a two-stage cascade mode is formed.
8. The apparatus of claim 7, further comprising: the coaxial switch switching recording module is used for distributing a register address to each coaxial switch and recording the switching times of the corresponding coaxial switch in real time according to the change of the distributed register address value.
9. The apparatus of claim 7, further comprising: and the coaxial switch driving module is used for driving each path of the coaxial switch so as to provide voltage and current required by the operation of the coaxial switch and assist the coaxial switch in realizing the opening and closing of a channel.
10. The apparatus according to any one of claims 6 to 9, wherein the reference clock for operating the PLL is a 10MHz clock signal, and the frequency range of the output rf signal is 100MHz to 3.5 GHz;
the first threshold value is set according to the loss of the radio frequency cable and the channel insertion loss of the radio frequency matrix switch.
11. A self-calibrating radio frequency matrix switch, characterized in that it comprises self-calibrating means of implementation of a radio frequency matrix switch according to any of claims 6 to 10.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610004170.6A CN106941382B (en) | 2016-01-04 | 2016-01-04 | Self-calibration implementation method and device of radio frequency matrix switch |
| PCT/CN2016/111116 WO2017118279A1 (en) | 2016-01-04 | 2016-12-20 | Self-calibration implementation method and device for radio frequency matrix switch |
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| CN108319562B (en) * | 2017-12-26 | 2020-09-08 | 北京航天测控技术有限公司 | High-precision broadband millimeter wave 8x8 matrix switch and microwave parameter evaluation and calibration method |
| CN108519751B (en) * | 2018-04-02 | 2021-02-09 | 南京国睿安泰信科技股份有限公司 | Solid-state matrix switch system |
| CN109245837A (en) * | 2018-11-14 | 2019-01-18 | 众格智能科技（上海）有限公司 | A kind of parallel self-calibration system of internet-of-things terminal radio frequency reception |
| CN110958062B (en) * | 2018-11-30 | 2022-05-03 | 南京长峰航天电子科技有限公司 | Radio frequency multichannel calibration system and method |
| CN110012591B (en) * | 2019-04-11 | 2024-02-27 | 成都兴仁科技有限公司 | Matrix integrated device and manufacturing method |
| CN111693861B (en) * | 2020-06-24 | 2022-08-05 | 中电科思仪科技股份有限公司 | Switch matrix channel fault diagnosis method and system |
| CN112462175A (en) * | 2020-11-12 | 2021-03-09 | 中国电子科技集团公司第二十九研究所 | Radio frequency multichannel switching device |
| CN113092859A (en) * | 2021-04-01 | 2021-07-09 | 北京航天计量测试技术研究所 | Switch matrix |
| CN114205010B (en) * | 2021-11-17 | 2024-04-26 | 中科可控信息产业有限公司 | Signal testing device, system, method and storage medium |
| CN114567391B (en) * | 2022-03-10 | 2023-07-11 | 四川恒湾科技有限公司 | Self-calibration method for downlink gain of remote radio unit |
| CN114978233B (en) * | 2022-05-11 | 2024-07-30 | 江苏艾科半导体有限公司 | Spread spectrum device based on NOVA radio frequency test platform |
| CN114665913B (en) * | 2022-05-20 | 2022-08-02 | 南京派格测控科技有限公司 | Isolation degree optimization method and system for solid-state matrix switch and electronic equipment |
| CN115112977B (en) * | 2022-06-24 | 2024-08-13 | 中国电子科技集团公司第三十八研究所 | Multi-channel frequency conversion module calibration and measurement integrated automatic test platform and test method |
| CN115361313B (en) * | 2022-07-12 | 2023-07-11 | 中国人民解放军国防科技大学 | Wireless communication comprehensive test maintenance system and test method |
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| CN101141805A (en) * | 2007-02-27 | 2008-03-12 | 中兴通讯股份有限公司 | Radio frequency signal generating and radio frequency power testing apparatus and power detecting method |
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| US7171179B2 (en) * | 2004-06-28 | 2007-01-30 | Broadcom Corporation | Adjustment of a received signal strength indication module |
| CN101881797A (en) * | 2010-06-25 | 2010-11-10 | 中国舰船研究设计中心 | Amplitude probability distribution recorder based on universal instrument |
| CN103516366B (en) * | 2013-09-26 | 2017-01-18 | 中科院微电子研究所昆山分所 | Input signal intensity indicator and indicating method |
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| CN101141805A (en) * | 2007-02-27 | 2008-03-12 | 中兴通讯股份有限公司 | Radio frequency signal generating and radio frequency power testing apparatus and power detecting method |
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