WO2017118279A1

WO2017118279A1 - Self-calibration implementation method and device for radio frequency matrix switch

Info

Publication number: WO2017118279A1
Application number: PCT/CN2016/111116
Authority: WO
Inventors: 吴盛辉; 夏健民; 丁宏基; 刘红卫; 胡清华; 王俊建
Original assignee: 中兴通讯股份有限公司
Priority date: 2016-01-04
Filing date: 2016-12-20
Publication date: 2017-07-13
Also published as: CN106941382B; CN106941382A

Abstract

Disclosed are a self-calibration implementation method and device for a radio frequency matrix switch. The method comprises: 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; and comparing the detected RSSI value on each channel with a reference value of a corresponding frequency point, and when an absolute value of a difference value of the two is less than a pre-set first threshold value, determining that a corresponding channel has completed self-calibration at a current frequency.

Description

Method and device for realizing self-calibration of radio frequency matrix switch

Technical field

Embodiments of the present invention relate to a test instrument implementation technology in the field of wireless communications, and in particular, to a self-calibration implementation method and apparatus for a radio frequency matrix switch.

Background technique

In the current mobile communication network, due to the design requirements of the network rules and networking, the Radio Remote Unit (RRU) in the wireless communication system is a multi-transmission mode, which calibrates the RRU in the factory. And the wireless performance test brings a cumbersome process. For example, the RRU is tested by manual switching, which is not only inefficient, but also easy to rework due to misoperation, unable to meet the requirements of bulk delivery, and not adapt to new The development of wireless communication technology in the situation, therefore, it is necessary to find a radio frequency matrix switch or other device to achieve the goal of automated testing.

At present, the usual practice of calibrating and testing the RRU is to use a splitter or a combiner, such as a 1 minute 8 splitter or an 8 in 1 combiner, using a separate method of uplink test and downlink test, as shown in the figure. 1 and Figure 2. This method requires a test procedure to be added, which is not only inefficient, but also prone to chaos in the manufacturing process. At the same time, because the standing wave difference and isolation index of each channel port of the power splitter or combiner cannot meet the requirements of the test requirements, the application place is limited and the promotion is not available.

However, there is a relatively advanced technical solution in the related art: automatic testing is performed by using an RF matrix switch, as shown in FIG. 3, the RF matrix switch is applied to the RRU test environment, and the instrument is tested and tested by the background test software. The pieces are controlled to form an automated test platform. Compared with the method shown in FIG. 1 and FIG. 2, although the method shown in FIG. 3 has advancedness and generalization, the conventional RF matrix switch has different cost and price differences due to different internal coaxial switch assembly methods. Larger. For example, a common 12-port full-matrix RF switch, the topology connection mode of its internal coaxial switch is shown in Figure 4. This connection requires 14 1×2 coaxial switches and 4 1×6 coaxial switches, which are composed of three. Level coaxial switch cascade mode. This method is assembled into a radio frequency matrix The oscillating wave, channel insertion loss, channel isolation and phase difference of each port can reach the ideal index, and it is suitable for testing the device under test with no more than 12 ports; however, the number of coaxial switches used in this cascading mode is large. The occupied space is large, the internal wiring is complicated, and the cost is high.

At the same time, since the current RF matrix switch only has the function of different channel switching, it can achieve the goal of automatic testing, but the calibration and maintenance of the RF matrix switch itself are not considered, and the function is relatively simple, resulting in the RF matrix switch calibration process. It is cumbersome to use an external vector network analyzer, signal source or spectrum analyzer to determine whether the channel indicators of the RF matrix switch are normal. Moreover, the user can not obtain the working condition of the coaxial switch in the RF matrix switch to judge whether the performance of the RF matrix switch is normal, and whether the device needs to be disassembled, which brings great inconvenience to the maintenance of the instrument during use.

Summary of the invention

In view of this, embodiments of the present invention are directed to a self-calibration implementation method and apparatus for a radio frequency matrix switch to enable at least an intelligent radio frequency matrix switch that is self-calibrating and easy to maintain.

According to an embodiment of the present invention, a self-calibration implementation method of a radio frequency matrix switch is provided, and the method includes:

Obtaining a radio frequency signal output by a radio frequency locked loop (PLL, Phase Locking Loop);

Detecting the power of the output RF signal, and reading a Received Signal Strength Indication value (RSSI) detected on the radio frequency receiving channel of the radio frequency matrix switch;

The RSSI value on each channel detected is compared with the reference value of the corresponding frequency point. When the absolute value of the difference is less than the preset first threshold, it is determined that the corresponding channel has completed self-calibration at the current frequency.

Optionally, in the above solution, the radio frequency matrix switch comprises 14 coaxial switches; the 14 coaxial switches comprise 12 1 minute 2 switches and 2 1 minute 12 switches, forming a two-stage cascade mode.

Optionally, in the above solution, the method further includes: assigning one to each coaxial switch The register address records the number of times of switching of the corresponding coaxial switch in real time according to the change of the assigned register address value.

Optionally, in the above solution, each path of the coaxial switch includes a driving circuit;

The method also includes the drive circuit providing the coaxial switch with voltage and current required for operation and assisting the coaxial switch to effect opening and closing of the channel.

Optionally, in the foregoing solution, the reference clock when the PLL operates is a 10 MHz clock signal, and the frequency range of the output RF signal is 100 MHz to 3.5 GHz;

The first threshold is set according to a loss of the radio frequency cable and a channel insertion loss of the radio frequency matrix switch.

According to another embodiment of the present invention, there is also provided a self-calibration implementation device for a radio frequency matrix switch, the device comprising:

Obtaining a module, configured to obtain a radio frequency signal output by the PLL;

Detecting a reading module, configured to detect a power of the output RF signal, and read an RSSI value detected on a radio frequency receiving channel of the radio frequency matrix switch;

The self-calibration judging module is configured to compare the detected RSSI value on each channel with the reference value of the corresponding frequency point, and when the absolute value of the difference is less than the preset first threshold, determine that the corresponding channel has been completed. Self-calibration at the current frequency.

Optionally, in the above solution, the device further includes: a coaxial switch switching recording module, configured to allocate a register address to each of the coaxial switches, and record the corresponding coaxial switch in real time according to the change of the assigned register address value. The number of switchings.

Optionally, in the above solution, the device further includes: a coaxial switch driving module, configured to drive each path of the coaxial switch to provide voltage and current required for the coaxial switch to operate, and assist the The coaxial switch realizes the opening and closing of the channel.

According to still another embodiment of the present invention, there is also provided a self-calibrating radio frequency matrix switch, the radio frequency matrix switch comprising the self-calibration implementing device of the radio frequency matrix switch according to any one of the above.

According to still another embodiment of the present invention, a storage medium is also provided. The storage medium is arranged to store program code for performing the following steps:

The self-calibration implementation method and device for the radio frequency matrix switch provided by the embodiment of the present invention acquires the radio frequency signal output by the PLL, detects the power of the output radio frequency signal, and reads the RSSI value detected on the radio frequency receiving channel of the radio frequency matrix switch, The RSSI value on each channel detected is compared with the reference value of the corresponding frequency point. When the absolute value of the difference is less than the preset first threshold, it is determined that the corresponding channel has completed self-calibration at the current frequency. In this way, not only the intelligent radio frequency matrix switch which can be self-calibrated and easy to maintain can be realized, but also the problem that the number of coaxial switches in the current 12-port RF matrix switch is large, the cost is high, the calibration and maintenance process is cumbersome, and the function is single.

Further, the radio frequency matrix switch of the embodiment of the invention adopts 14 coaxial switches to form a two-stage cascade mode. Therefore, the number of coaxial switches used is the least, and the technical progress is made, and the function is more powerful, thereby achieving the radio frequency matrix. The effect of self-calibration of the switch; in addition, the user can also monitor the working condition of the coaxial switch in the RF matrix switch in real time, and can specifically check the fault and facilitate user maintenance.

DRAWINGS

The drawings described herein are intended to provide a further understanding of the invention, and are intended to be a part of the invention. In the drawing:

1 is a schematic diagram of a method for testing an RRU uplink by using a power splitter in the related art;

2 is a schematic diagram of a method for testing a RRU downlink by using a combiner in the related art;

3 is a schematic diagram of a method for testing an RRU by using a radio frequency matrix switch in the related art;

4 is a schematic diagram of a coaxial connection topology of a 2×12 port full matrix RF switch in the related art;

FIG. 5 is a schematic flowchart of a method for implementing self-calibration of a radio frequency matrix switch according to an embodiment of the present invention; FIG.

6 is a schematic diagram of a topology connection mode of a coaxial switch of a 2×12 port RF matrix switch according to an embodiment of the present invention;

7 is a schematic structural diagram of a coaxial switch driving circuit according to an embodiment of the present invention;

8 is a schematic diagram of a self-calibration radio frequency transmitting link according to an embodiment of the present invention;

9 is a schematic diagram of a self-calibration radio frequency receiving link according to an embodiment of the present invention;

10 is a schematic diagram of a specific process of self-calibration of a radio frequency matrix switch according to an embodiment of the present invention;

11 is a schematic diagram 1 of a self-calibration wiring of a radio frequency matrix switch according to an embodiment of the present invention;

12 is a schematic diagram 2 of a self-calibration wiring of a radio frequency matrix switch according to an embodiment of the present invention;

FIG. 13 is a schematic structural diagram of a self-calibration implementation device of a radio frequency matrix switch according to an embodiment of the present invention.

detailed description

The invention will be described in detail below with reference to the drawings in conjunction with the embodiments. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict.

It should be noted that the terms "first", "second" and the like in the specification and claims of the present invention and the above drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or Prioritization.

As shown in FIG. 5, the self-calibration implementation process of the radio frequency matrix switch in the embodiment of the present invention includes the following steps:

Step 501: Acquire a radio frequency signal output by the PLL.

Here, the reference clock when the PLL operates may be a 10 MHz clock signal, and the frequency range of the output RF signal is 100 MHz to 3.5 GHz.

Here, the radio frequency matrix switch comprises 14 coaxial switches; the 14 coaxial switches comprise 12 1 minute 2 switches and 2 1 minute 12 switches (represented by 1×2 and 1×12, respectively), which constitute two Level cascading mode. The internal coaxial switch topology connection mode of the 2×12 port RF matrix switch designed by the embodiment of the present invention is as shown in FIG. 6 .

The COM ports of the two 1×12 coaxial switches are respectively used as the transmission port and the reflection port of the radio frequency matrix switch. In actual use, the transmission port and the Reflection port are used as the signal output port and the input port. Connect to the RF port of the spectrum analyzer and signal source respectively. Ports 1 to 12 of the 1×12 switch numbered a are connected to J1 ports of 12 1×2 switches, and ports 1 to 12 of the 1×12 switch numbered b are connected to 12 1×2 switches. On the J2 port, the COM ports of the 12 1×2 switches are respectively used as ports 1 to 12 of the RF matrix switch, and are connected to the respective RF ports of the device under test in practical applications. In this way, the port standing wave and channel insertion loss indicators of the RF matrix switch can be decomposed into the coaxial switches and the RF cables at all levels, so that the wireless indicators meet the design requirements:

Channel insertion loss ≤ 2dB@4GHz;

Port standing wave ≤1.3@4GHz;

Channel isolation ≥100dB@4GHz.

Moreover, all the RF cables can be designed to be equal in length to ensure that the phase differences of the respective channels of the RF matrix switch are consistent. For example, the embodiment of the present invention is designed to be in the range of 4 GHz. The channel phase difference is less than 15°. The coaxial switch topology connection of this mode can realize the full-matrix RF switching function, fully satisfying the testing requirements of the wireless product RRU and its components, and adopting the least number of coaxial switches.

Here, the method further includes: assigning a register address to each of the coaxial switches, and recording the number of times of switching of the corresponding coaxial switch in real time according to the change of the assigned register address value.

Here, each of the coaxial switches includes a driving circuit; the method further includes: the driving circuit provides voltage and current required for operation of the coaxial switch, and assists the coaxial switch to implement a channel Disconnect and close.

In the embodiment of the present invention, the composition of the coaxial switch driving circuit is as shown in FIG. 7, and a combination of an NPN transistor and a P-channel enhancement type MOSFET is adopted. Wherein, when the base current of the NPN transistor has a current i _B , the NPN transistor is turned on, and the magnitude of the base current i _B can control the triode to operate in the saturation region, and the voltage drop between the collector and the emitter is small. Thus, a negative voltage difference can be formed between the gate Gate and the source of the P-channel MOSFET, the MOSFET is turned on, the drain of the MOSFET drain Drain outputs a positive voltage, and the current required by the load is supplied, corresponding to the same A certain way of the shaft switch is turned on.

Here, the central processing unit (CPU, Central Processing Unit) of the RF matrix switch can assign a register address to each coaxial switch, and allocate a total of 14 register addresses, each of which has a value of 16 bits, each corresponding to this One way of the coaxial switch. When the write register value is 0x01 (hexadecimal), the register value corresponds to the first way NPN transistor is turned on, that is, the first path of the coaxial switch is turned on. Similarly, when the write register value is 0x04, the fourth path corresponding to the coaxial switch is turned on. It is necessary to pay special attention to the fact that the register value written by the coaxial switch register address cannot have two or more bits or two of the binary number, otherwise it will affect the operating system to correctly decode the written value, because when writing When the register value has two or more digits and is 1 at the same time, the value is invalid. In addition, the source-to-drain of the selected P-channel MOSFET The maximum voltage difference between the poles and the maximum output current of the drain must meet the operating conditions of the load. Therefore, it is necessary to properly select the type of the P-channel MOSFET.

Here, the voltage dividing circuit composed of the resistors R3 and R4 in the coaxial switch driving circuit should ensure that a voltage difference V _gs is formed between the gate and the source of the P-channel MOSFET when the transistor is turned on, and this V _gs The value should meet the requirements for MOSFET tube conduction. The function of the capacitor C1 is to delay the on-time of the MOSFET to avoid the drain output of the MOSFET during the turn-on of the printed circuit board (PCB). Negative voltage. The Transistor-Transistor Logic (TTL) level required for the coaxial switch drive circuit can be provided by writing the internal registers of the CPU.

Step 502: Detect the power of the output RF signal, and read the RSSI value detected on the radio frequency receiving channel of the radio frequency matrix switch.

Step 503: Compare the detected RSSI value on each channel with the reference value of the corresponding frequency point. When the absolute value of the difference is less than the preset first threshold, determine that the corresponding channel has been completed at the current frequency. Self-calibration.

Here, the reference value of the corresponding frequency point is a standard value specified in the specification protocol; the first threshold value may be set according to a loss of the radio frequency cable and a channel insertion loss of the radio frequency matrix switch; since the loss of the radio frequency cable is less than 1 dB However, under normal circumstances, the insertion loss of all channels of the RF matrix switch is less than 2 dB. Therefore, the difference between the detected RSSI value on each channel and the reference value of the corresponding frequency point, that is, RSSIi-RSSI0 (i≥1 and less than or equal to The total number of channels) should be less than 3dB.

The self-calibration process of the RF matrix switch of the embodiment of the present invention is further described in detail below:

The RF matrix switch self-calibration unit is implemented using the framework shown in Figures 8 and 9, wherein the RF matrix switch self-calibration unit includes a radio frequency transmit link portion and a radio frequency receive link portion, and a transmit link oven crystal oscillator (OCXO, Oven). Controlled Crystal Oscillator) output The 10MHz clock signal is used as a reference clock for PLL operation with a voltage-controlled oscillator (VCO). Among them, the PLL can output the RF signal from 100MHz to 3.5GHz, the power can be up to 10dBm, the phase noise and high-order harmonic suppression of the output RF signal meet the requirements, and the 3dBπ network adjusts the output of the transmitting link to match. In addition, the receive link power detection device converts the RF signal into a voltage signal, and the analog-to-digital (AD) conversion device converts the voltage signal into a digital signal.

The self-calibration process of the RF matrix switch is shown in Figure 10. The detailed implementation process is as follows:

Step 1001: The user selects a self-calibration program on the touch screen, and inputs a channel to be calibrated to turn on the channel;

For example: Transmission to the PORT1 channel, at this time, the transmission port of the RF matrix switch is turned on to the PORT1 channel;

Step 1002: Connect the radio frequency transmitting channel and the receiving channel by using the radio frequency cable a;

Here, as shown in FIG. 11, the PLL configures parameters for the PLL to output a tone signal of a frequency band of 100 MHz to 3.5 GHz with a power of -10 dBm. The receiving channel power detecting device detects the input RF signal, converts the input RF signal into a voltage signal, and outputs the digital signal after analog-to-digital conversion, and the processor reads the digital value through a Serial Peripheral Interface (SPI). The signal, in this way, can calibrate the power detection chip in the range of 100MHz to 3.5GHz, and perform curve fitting and table verification to ensure that the detected signal power in this frequency band is consistent with the actual transmitted signal power.

Step 1003: Connect the radio frequency matrix switch channel by using the radio frequency cable b to ensure that the radio frequency signal is connected.

Here, the end of the radio frequency cable a radio frequency receiving channel is unscrewed, connected to the PORT1 port of the radio frequency matrix switch, and the two ends of the other radio frequency cable b are respectively connected to the transmission port of the radio frequency matrix switch and the radio frequency receiving RX channel. In this way, the RF receiving channel has a radio frequency signal. Input, as shown in Figure 12.

Step 1004: At the frequency point to be calibrated, detect the RSSI value of the calibrated channel, and compare with the reference value of the corresponding frequency point to determine whether the calibration value is normal;

Step 1005: Replace the connection mode of the RF cable, and calibrate the other channels in turn.

Specifically, the user inputs the frequency to be calibrated (or a certain frequency range) on the touch screen, reads the receiving channel power RSSI1 value, and compares it with the reference value RSSI0 of the corresponding frequency point. If the RSSI1-RSSI0 is less than 3 dB, the completion is completed. Self-calibration of the RF matrix switch transmission port to the PORT1 port at the current frequency. Similarly, other channels can be self-calibrated in turn. When RSSIi-RSSI0 (i≥1 and less than or equal to the total number of channels) of all channels are smaller than the first threshold, it indicates that the RF matrix switch is self-calibrated.

After completing the self-calibration of each channel, the switch mode power converter of the RF self-calibration link is disabled, so that the RF matrix switch self-calibration unit does not work to save system device power consumption and prevent the clock Higher harmonics interfere with other circuits.

In practical applications, the RF matrix switch communicates with external devices through Gigabit Ethernet. When applied to the automated test platform, the background test software sends channel switching commands to the RF matrix switch according to actual application requirements. After the command, the command is decoded, the register address to be processed is parsed, and a bit corresponding to the corresponding address is written into binary 1, and the CPU-related general input/output (GPIO, General Purpose Input/Output) port outputs TTL. High level, so that it corresponds to the positive voltage of the MOSFET tube drive circuit, the coaxial RF switch is turned on, and the display screen visually indicates that a certain channel is turned on.

Here, it is also possible to assign a register address to each coaxial switch in the memory in advance, and the initial value thereof is 0, wherein one coaxial switch is switched once, and the corresponding register value is added by 1, so that all coaxial switches can be recorded in real time. The number of switchings provides an early warning to the coaxial switch that is adjacent or exceeds the life, which is convenient for user maintenance. Users can also visually view each of them by touching the display. The current number of switching of the axis switch.

Here, the coaxial switch can be calculated to be close to or beyond the life based on the unit hour, thereby providing an early warning to the coaxial switch that is adjacent or exceeding the life.

In order to achieve the above method, the embodiment of the present invention further provides a self-calibration implementation device for the radio frequency matrix switch. As shown in FIG. 13 , the device includes an acquisition module 130, a detection and reading module 131, and a self-calibration determination module 132.

The obtaining module 130 is configured to acquire a radio frequency signal output by the PLL;

The detecting and reading module 131 is configured to detect the power of the output RF signal, and read the RSSI value detected on the radio frequency receiving channel of the radio frequency matrix switch;

The self-calibration judging module 132 is configured to compare the detected RSSI value on each channel with the reference value of the corresponding frequency point, and when the absolute value of the difference is less than the preset first threshold, determine that the corresponding channel has been completed. Self-calibration at the current frequency.

Here, the radio frequency matrix switch comprises 14 coaxial switches; the 14 coaxial switches comprise 12 1 minute 2 switches and 2 1 minute 12 switches, forming a two-stage cascade mode.

The reference clock of the PLL is a 10 MHz clock signal, and the frequency range of the output RF signal is 100 MHz to 3.5 GHz; the first threshold is generally set according to the loss of the RF cable and the channel insertion loss of the RF matrix switch. It is 3dB.

The device further includes: a coaxial switch switching recording module 133, configured to allocate a register address to each of the coaxial switches, and record the number of times of switching of the corresponding coaxial switch in real time according to the change of the assigned register address value;

A coaxial switch drive module 134 is provided to drive each of the coaxial switches to provide the voltage and current required for operation of the coaxial switch and to assist in the opening and closing of the channels by the coaxial switch.

In an actual application, the obtaining module 130, the detecting and reading module 131, and the self-calibration judgment The module 132, the coaxial switch switching recording module 133, and the coaxial switch driving module 134 may each be a CPU, a microprocessor (MPU, a Micro Processor Unit), a digital signal processor (DSP, Digital Signal Processor), or Field Programmable Gate Array (FPGA) implementation.

The embodiment of the invention obtains the radio frequency signal output by the PLL, detects the power of the output radio frequency signal, and reads the RSSI value detected on the radio frequency receiving channel of the radio frequency matrix switch, and detects the RSSI value and the corresponding frequency on each channel detected. The reference values of the points are compared. When the absolute value of the difference is less than the preset first threshold, it is determined that the corresponding channel has completed the self-calibration at the current frequency. In this way, not only the intelligent radio frequency matrix switch which can be self-calibrated and easy to maintain can be realized, but also the problem that the number of coaxial switches in the current 12-port RF matrix switch is large, the cost is high, the calibration and maintenance process is cumbersome, and the function is single.

Through the description of the above embodiments, those skilled in the art can clearly understand that the method according to the above embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, by hardware, but in many cases, the former is A better implementation. Based on such understanding, the technical solution of the present invention, which is essential or contributes to the prior art, may be embodied in the form of a software product stored in a storage medium (such as ROM/RAM, disk, The optical disc includes a number of instructions for causing a terminal device (which may be a cell phone, a computer, a server, or a network device, etc.) to perform the methods described in various embodiments of the present invention.

Embodiments of the present invention also provide a storage medium. Optionally, in the embodiment, the foregoing storage medium may be configured to store program code for performing the following steps:

Step 501: Acquire a radio frequency signal output by the PLL.

Optionally, in this embodiment, the foregoing storage medium may include, but not limited to, a USB flash drive, a Read-Only Memory (ROM), a Random Access Memory (RAM), a mobile hard disk, and a magnetic memory. A variety of media that can store program code, such as a disc or a disc.

For example, the specific examples in this embodiment may refer to the examples described in the foregoing embodiments and the optional embodiments, and details are not described herein again.

It will be apparent to those skilled in the art that the various modules or steps of the present invention described above can be implemented by a general-purpose computing device that can be centralized on a single computing device or distributed across a network of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein. The steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps thereof are fabricated as a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software.

The above description is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Industrial applicability

As described above, the self-calibration implementation method and device for the radio frequency matrix switch provided by the embodiments of the present invention have the following beneficial effects: not only can realize the self-calibration and easy-to-maintain intelligent radio frequency matrix switch, but also solve the current 12 ports. The number of coaxial switches in the RF matrix switch is high, the cost is high, the calibration and maintenance process is cumbersome, and the function is single. Further, the radio frequency matrix switch of the embodiment of the invention adopts 14 coaxial switches to form a two-stage cascade mode. Therefore, the number of coaxial switches used is the least, and the technical progress is made, and the function is more powerful, thereby achieving the radio frequency matrix. The effect of self-calibration of the switch; in addition, the user can also monitor the working condition of the coaxial switch in the RF matrix switch in real time, and can specifically check the fault and facilitate user maintenance.

Claims

A self-calibration implementation method of a radio frequency matrix switch, the method comprising:

Obtaining the RF signal output by the RF phase-locked loop PLL;

Detecting the power of the output RF signal, and reading the received signal strength indication RSSI value detected on the radio frequency receiving channel of the radio frequency matrix switch;

The RSSI value on each channel detected is compared with the reference value of the corresponding frequency point. When the absolute value of the difference is less than the preset first threshold, it is determined that the corresponding channel has completed self-calibration at the current frequency.
The method of claim 1 wherein said radio frequency matrix switch comprises 14 coaxial switches; said 14 coaxial switches comprising 12 1 minute 2 switches and 2 1 minute 12 switches forming a two-stage cascade the way.
The method of claim 2, wherein the method further comprises: assigning a register address to each of the coaxial switches, and recording the number of times of switching of the corresponding coaxial switch in real time according to the change in the assigned register address value.
The method of claim 2 wherein each of said coaxial switches comprises a drive circuit;

The method also includes the drive circuit providing the coaxial switch with voltage and current required for operation and assisting the coaxial switch to effect opening and closing of the channel.
The method according to any one of claims 1 to 4, wherein the reference clock when the PLL operates is a 10 MHz clock signal, and the frequency range of the output RF signal is 100 MHz to 3.5 GHz;

The first threshold is set according to a loss of the radio frequency cable and a channel insertion loss of the radio frequency matrix switch.
A self-calibrating implementation device for a radio frequency matrix switch, the device comprising:

Obtaining a module, configured to obtain a radio frequency signal output by the RF phase locked loop PLL;

Detecting a reading module, configured to detect a power of the output RF signal, and read a received signal strength indication RSSI value detected on a radio frequency receiving channel of the radio frequency matrix switch;

The self-calibration judging module is configured to compare the detected RSSI value on each channel with the reference value of the corresponding frequency point, and when the absolute value of the difference is less than the preset first threshold, determine that the corresponding channel has been completed. Self-calibration at the current frequency.
The apparatus according to claim 6, wherein said radio frequency matrix switch comprises 14 coaxial switches; said 14 coaxial switches comprising 12 1 minute 2 switches and 2 1 minute 12 switches, forming a two-stage cascade the way.
The apparatus according to claim 7, wherein said apparatus further comprises: a coaxial switch switching recording module, configured to assign a register address to each of the coaxial switches, and to record correspondingly in real time according to the change of the assigned register address value The number of times the coaxial switch is switched.
The apparatus of claim 7 wherein said apparatus further comprises: a coaxial switch drive module arranged to drive each of said coaxial switches to provide voltage and current required to operate said coaxial switch, And assisting the coaxial switch to achieve opening and closing of the channel.
The apparatus according to any one of claims 6 to 9, wherein the reference clock when the PLL operates is a 10 MHz clock signal, and the frequency range of the output radio frequency signal is 100 MHz to 3.5 GHz;

The first threshold is set according to a loss of the radio frequency cable and a channel insertion loss of the radio frequency matrix switch.
A self-calibrating radio frequency matrix switch comprising the self-calibration implementation of the radio frequency matrix switch of any one of claims 6 to 10.
A storage medium arranged to store a computer program for performing the self-calibration implementation method of the radio frequency matrix switch according to any one of claims 1 to 5.