Fault diagnosis and positioning device for DAS room distribution system

Abstract

The invention discloses a DAS indoor distribution system fault diagnosis and positioning device, and relates to the technical field of mobile communication operation and maintenance equipment. The device comprises an information source end fault diagnosis and positioning device, a combiner and a tail end response device, the information source end fault diagnosis and positioning device sends inquiry signals, the tail end response device receives and returns response signals, rapid fault diagnosis and positioning are achieved, the combiner eliminates mutual interference between the inquiry signals and mobile signals, clear transmission of the signals is ensured, and the fault diagnosis and positioning accuracy is improved. The tail end response device adopts a filter to eliminate mobile signal interference, floating ground copper foil provides a stable grounding point, the information source end fault diagnosis positioning device receives instructions, controls the diagnosis process and outputs a measurement report, the ultrahigh frequency electronic tag is suitable for various communication scenes, the application prospect is wide, the device shortens the troubleshooting time, the maintenance efficiency is improved, and the maintenance cost is reduced. And support is provided for intelligent management of the DAS indoor distribution system.

Description

Technical Field

[0001] The present application belongs to the technical field of mobile communication operation and maintenance equipment, and in particular, relates to a DAS room distribution system fault diagnosis and positioning device. Background Art

[0002] Mobile communications have entered the 5G era. The characteristics of 5G broadband signals are high carrier frequency, weak radio wave penetration, low working bandwidth and low sensitivity. This results in the traditional outdoor macro base station having almost no radio wave coverage for indoor working environments. With the increasing maturity and large-scale application of passive frequency shifting systems, the indoor coverage problem of 5G MIMO signals has been successfully solved. At present, DAS has become the mainstream technology for 5G indoor coverage.

[0003] However, the signal source and other system equipment of the DAS indoor distributed system cannot provide the central network management with fault location reports such as poor connection points, damaged or stolen terminal antennas, weak coverage, etc. like outdoor macro stations. The fault diagnosis and location of the DAS indoor distributed system mainly rely on the RRU standing wave ratio alarm at the signal source end. The loss between the terminal antenna and the signal source end of the DAS indoor distributed system is 20-30dB. The standing wave ratio method can basically not determine the antenna damage and theft faults, let alone locate and determine soft faults such as weak coverage. It can only determine the poor connection between the signal source itself and the DAS. It relies on maintenance personnel to manually run points for measurement or passively wait for customer complaints, which is time-consuming and laborious, and the user experience is poor. More than 80% of mobile high-speed data services occur in indoor environments, and the problem needs to be solved urgently. Summary of the invention

[0004] The purpose of this application is to provide a DAS indoor distributed system fault diagnosis and positioning device, which combines the inquiry signal and the mobile signal through a combiner and eliminates the mutual interference between the two. At the same time, the terminal response device has a built-in filter to eliminate the interference of the mobile signal, and the source end uses the response signal interference canceller to eliminate the co-frequency interference of the inquiry signal leakage, thereby ensuring the accurate transmission of the signal and the accuracy of the diagnosis and positioning.

[0005] In order to achieve the above-mentioned purpose, the embodiment of the present application provides a DAS indoor distributed system fault diagnosis and positioning device, comprising: A fault diagnosis and positioning device at the information source end, used to receive instructions from the management terminal and output an inquiry signal; A combiner is connected to the fault diagnosis and positioning device at the signal source end and receives the mobile signal input, and is used to combine the inquiry signal and the mobile signal so that the inquiry signal and the mobile signal are transmitted on the same path and mutual interference between the inquiry signal and the mobile signal is eliminated; The terminal response device is attached to the antenna housing of the DAS indoor distribution system, and is used to receive and analyze the inquiry signal and output a response signal with a unique ID number; the number of terminal response devices is the same as the number of antenna housings.

[0006] According to the above method of the embodiment of the present application, the following additional technical features may also be provided: Further, the source-side fault diagnosis and positioning device includes: an inquiry signal and response signal separator, connected to the combiner via a radio frequency port, for separating the inquiry signal and the response signal; An inquiry signal generator, connected to the inquiry signal and response signal separator, for generating an inquiry signal; The reply signal interference canceller is connected to the inquiry signal and reply signal separator to eliminate the co-frequency interference of the inquiry signal leakage on the reply signal; The reply signal decoder and amplitude measurer is connected to the reply signal interference canceller and is used to parse the ID number of the reply signal and measure the amplitude of the reply signal; The device control and data processor are respectively connected to the inquiry signal generator and the response signal decoder and amplitude measurer, and are used to receive instructions from the management terminal through the data input / output interface circuit, control the working process of the fault diagnosis and positioning device at the source end, analyze and process the measurement results of the response signal decoder and amplitude measurer, and output a measurement report.

[0007] Further, the terminal response device includes: a flexible printed circuit symmetrical dipole antenna, the flexible printed circuit symmetrical dipole antenna includes a response chip interface, a first radiation dipole arm and a second radiation dipole arm, and is used to receive an inquiry signal and transmit a response signal to the DAS indoor distribution system; A first filter is inserted between the first radiation dipole arm and the transponder chip interface, and is used to eliminate interference of the mobile signal to the terminal transponder; A second filter is inserted between the second radiation dipole arm and the transponder chip interface to eliminate interference of the mobile signal to the terminal transponder; The floating ground copper foil is connected to the first filter and the second filter respectively, and is used to provide a zero-potential floating ground point for the first filter and the second filter; The ultra-high frequency electronic tag is connected to the first filter and the second filter respectively, and is used to receive the inquiry signal and output a response signal; the response signal has the same frequency as the inquiry signal.

[0008] Furthermore, the copper foil area of ​​the floating copper foil is not less than 50mm 2 .

[0009] Furthermore, the minimum edge spacing between the floating copper foil and the flexible printed circuit symmetrical dipole antenna is 5 mm; and the isolation between the floating copper foil and the flexible printed circuit symmetrical dipole antenna is greater than 50 dBc.

[0010] Furthermore, the frequency range of the UHF electronic tag is 850 MHz to 960 MHz.

[0011] Furthermore, the management terminal includes a central network management and a local computer.

[0012] Furthermore, the first filter and the second filter are surface acoustic wave filters or bulk acoustic wave filters.

[0013] Furthermore, the power of the inquiry signal is ≥10W, the inquiry signal and response signal separator is a four-port circulator with port isolation greater than 45dB and power capacity greater than 20W, and the operating frequency of the four-port circulator is the same as or includes the passband frequency of the end response device.

[0014] Furthermore, the port isolation of the combiner is greater than 65dBc, and the third-order intermodulation index is lower than Metal cavity resonator.

[0015] Compared with the prior art, the DAS room system fault diagnosis and positioning device provided by the embodiment of the present application has the following beneficial technical effects: The embodiment of the present application sends an inquiry signal through the fault diagnosis and positioning device at the source end, and the terminal response device receives and returns the response signal, thereby realizing rapid diagnosis and precise positioning of faults of each antenna housing in the DAS indoor distributed system, shortening the troubleshooting time and improving maintenance efficiency.

[0016] The combiner of the embodiment of the present application can combine the inquiry signal and the mobile signal and eliminate the mutual interference between them, thereby ensuring that the inquiry signal can be accurately and clearly transmitted to the end response device, while avoiding the interference of the mobile signal on the fault diagnosis process.

[0017] The end response device of the embodiment of the present application adopts a first filter and a second filter to eliminate the interference of the mobile signal on the end response device. In addition, the introduction of the floating copper foil provides a stable zero-potential floating ground point for the filter, further improving the stability of the system.

[0018] The device control and data processor in the source-end fault diagnosis and locating device of the embodiment of the present application can receive instructions from the management terminal and control the entire fault diagnosis and locating process. At the same time, it can also analyze and process the measurement results of the response signal and output a measurement report, providing strong support for the intelligent management of the system.

[0019] The ultra-high frequency electronic tag of the embodiment of the present application operates in the frequency range of 850 MHz to 960 MHz, which makes it suitable for a variety of communication scenarios. With the continuous development of new-generation communication technologies such as 5G, the application prospects of this device in fault diagnosis and positioning of DAS indoor distributed systems will be broader. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1A structural block diagram of a DAS room system fault diagnosis and positioning device according to an embodiment of the present application is shown; Figure 2 A structural block diagram of a device for diagnosing and locating a fault at a source end according to an embodiment of the present application is shown; Figure 3 A structural block diagram of the end response device of an embodiment of the present application is shown. DETAILED DESCRIPTION

[0021] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. It is to be understood that the specific embodiments described herein are only used to explain the present application, rather than to limit the present application. It should also be noted that, for ease of description, only some structures related to the present application are shown in the accompanying drawings, rather than all structures. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0022] The terms "including" and "having" and any variations thereof in this application are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products or devices.

[0023] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0024] like Figure 1 As shown, the embodiment of the present application provides a DAS room distribution system fault diagnosis and positioning device, including: The source-side fault diagnosis and locating device is used to receive instructions from the management terminal and output an inquiry signal. This device is the core of the fault diagnosis process. It generates a specific inquiry signal based on the instructions of the management terminal to detect the status of the DAS indoor distribution system. By sending an inquiry signal and receiving an answer signal from the terminal answering device, the source-side fault diagnosis and locating device can locate the fault point in the system. This is crucial for quickly and accurately identifying and solving problems.

[0025] The combiner is used to combine the inquiry signal and the mobile signal so that they are transmitted on the same path and the mutual interference between them is eliminated. The combiner is a key component to ensure that the two signals can be transmitted simultaneously without interfering with each other. In complex communication systems, mutual interference of signals is a common problem. The design of the combiner is to minimize such interference, thereby ensuring the accuracy of fault diagnosis and positioning. Specifically, the combiner in the embodiment of the present application has a port isolation greater than 65dBc and a third-order intermodulation index less than Metal cavity resonator. Port isolation is a key technical indicator used to describe the degree of isolation of signals between different ports in a combiner, that is, the ability of two signals not to affect each other. The port isolation of the combiner in the embodiment of the present application is greater than 65dBc, which means that the combiner can well isolate the signals between different ports and prevent interference between signals. In practical applications, high port isolation is crucial to ensure the stability and reliability of the communication system.

[0026] The third-order intermodulation index (PIM3) is an important indicator for measuring the performance of RF devices such as combiners in a multi-signal environment. It reflects the strength of the intermodulation products generated by the nonlinear effect when the device receives multiple signals. The third-order intermodulation index of the combiner in the embodiment of the present application is better than , which means that under the condition of a total power of 40W (two 20W carrier signals), the intensity of the third-order intermodulation products generated by the combiner is very low and will not have a significant impact on the communication system. This ensures the excellent performance of the combiner in high-power, multi-signal environments.

[0027] Metal cavity resonators are usually made of metal or dielectric materials and have a certain cavity structure. They can resonate at a specific frequency to amplify or filter the signal. Metal cavity resonators can provide high port isolation and effectively prevent interference between signals. Metal cavity resonators introduce less loss during signal transmission, which is conducive to maintaining signal integrity. Metal cavity resonators usually have a wide frequency coverage range and are suitable for the needs of various communication systems.

[0028] The end-responder is attached to the antenna housing of the DAS indoor distribution system. It is used to receive and analyze the query signal and output a response signal with a unique ID number. Each end-responder is associated with a specific antenna housing, so the ID number in its response signal can be used for positioning. The number of end-responders is the same as the number of antenna housings, which means that each antenna in the system has a corresponding end-responder, thus achieving full coverage of the entire system.

[0029] Specifically, Figure 2 As shown, the source end fault diagnosis and positioning device includes: The management terminal, including the central network management and the local computer, serves as the control center of the entire fault diagnosis and location system. The management terminal is responsible for sending instructions to the source fault diagnosis and location device and receiving the measurement report returned by it. The management terminal provides a human-computer interaction interface, allowing operators to easily monitor and manage the entire fault diagnosis and location process.

[0030] The inquiry signal and response signal separator is connected to the combiner through the RF port and is used to separate the inquiry signal and the response signal. In the DAS indoor distribution system, the inquiry signal is sent by the fault diagnosis and positioning device at the source end to detect the fault point in the system; and the response signal is sent by the end response device after receiving the inquiry signal, and contains the location information of the fault point. Specifically, the power of the inquiry signal in the embodiment of the present application is ≥10W, and the inquiry signal and response signal separator is a four-port circulator with a port isolation greater than 45dB and a power capacity greater than 20W. The operating frequency of the four-port circulator is the same as the passband frequency of the end response device or includes the passband frequency of the end response device. The device can generate and send a high-power inquiry signal to ensure that the signal can overcome the loss during transmission and still have sufficient strength to trigger a response when it reaches the end response device. After receiving the response signal returned by the end response device, the device can effectively separate it from the inquiry signal or other interference signals, and transmit it to the subsequent processing circuit. The inquiry signal power is ≥10W to ensure the transmission efficiency of the signal and the reliability of the triggered response. The port isolation is greater than 45dB to ensure that the signals between different ports can be effectively isolated to prevent interference between signals. This is crucial to improving signal quality and system stability. The power capacity is greater than 20W to ensure that the device can withstand power up to 20W or higher without damage. This ensures the reliability of the device under long-term operation. The operating frequency is the same as the passband frequency of the end response device or is included in its operating frequency range. This ensures that the inquiry signal can be smoothly transmitted to the end response device, and the response signal can be accurately returned to the receiving end without signal loss or distortion due to frequency mismatch.

[0031] The inquiry signal generator is connected to the inquiry signal and response signal separator to generate an inquiry signal, which is sent to the system to trigger the response of the end response device.

[0032] The reply signal interference canceller is connected to the inquiry signal and reply signal separator to eliminate the co-frequency interference of the inquiry signal on the reply signal. In the DAS indoor distribution system, the inquiry signal and the reply signal may be in the same frequency range, so an interference canceller is required to ensure the accurate reception and analysis of the reply signal.

[0033] The reply signal decoder and amplitude measurer is connected to the reply signal interference canceller to parse the reply signal ID and measure the reply signal amplitude. This component is responsible for extracting useful information from the reply signal, such as the location of the fault point and the signal strength.

[0034] The device control and data processor are connected to the inquiry signal generator and the response signal decoder and amplitude measurer respectively, receive the instructions of the management terminal through the data input / output interface circuit, control the working process of the source end fault diagnosis and positioning device, analyze and process the measurement results of the response signal decoder and amplitude measurer, and output the measurement report. This component is the core of the entire source end fault diagnosis and positioning device, responsible for receiving instructions, controlling the work of each component, and outputting the final measurement results and reports.

[0035] The various components of the source-end fault diagnosis and positioning device work closely together to achieve the diagnosis and positioning of DAS indoor distributed system faults. The inquiry signal generator generates an inquiry signal and sends it to the system together with the mobile signal through a combiner. After receiving the inquiry signal, the terminal response device sends a response signal, which is processed by the response signal interference canceller after passing through the combiner and the inquiry signal and response signal separator to eliminate co-frequency interference. Then, the response signal is sent to the response signal decoder and amplitude meter for analysis and measurement. Finally, the device control and data processor receives these results and outputs a measurement report.

[0036] In this embodiment, because the inquiry signal, the response signal and the 5G signal are strictly transmitted on the same path, the path loss of antenna ports with different IDs can be estimated based on this, and the 5G signal strength of the antenna port can be calculated. If the signal is small, it can be judged that it is weak coverage. If it is unstable, it can be judged that there is a hidden danger in the transmission line. If the response signal is not received, it can be judged that the line is broken or the antenna is damaged or stolen. Finally, a fault diagnosis report is sent to the central network management or the local computer.

[0037] Specifically, the terminal response device is attached to the antenna housing of the DAS indoor distribution system, and is responsible for receiving and analyzing the query signal from the fault diagnosis and positioning device at the source end while excluding the mobile signal, and outputting a response signal with a unique ID number. The design of the terminal response device ensures the accuracy and efficiency of fault diagnosis, such as Figure 3 As shown, it includes: The flexible printed circuit symmetrical dipole antenna includes a transponder chip interface, a first radiating dipole arm and a second radiating dipole arm, and is used to receive an inquiry signal and transmit the response signal to a DAS indoor distribution system. Its symmetrical design helps to improve the antenna's receiving and transmitting efficiency and ensure signal stability and accuracy.

[0038] The first filter and the second filter are respectively inserted between the first radiation dipole arm and the second radiation dipole arm and the transponder chip interface to eliminate the interference of the mobile signal on the terminal transponder. The filter can selectively pass or block signals of specific frequencies, thereby ensuring the clear transmission of the inquiry signal and the response signal.

[0039] Specifically, the first filter and the second filter in the embodiment of the present application are surface acoustic wave (SAW) filters or bulk acoustic wave (BAW) filters, wherein: The basic principle of BAW filter is the same as that of SAW filter. The difference is that the sound waves propagate vertically in BAW filter. At the same time, the use of electrodes and the thickness of the thin film piezoelectric layer determine the resonant frequency of the filter. At high frequencies, the thickness of the thin film piezoelectric layer is on the order of several microns.

[0040] SAW filter is the abbreviation of surface acoustic wave filter. It is a special filtering device made of piezoelectric materials such as quartz crystal and piezoelectric ceramics, using their piezoelectric effect and the physical characteristics of surface acoustic wave propagation.

[0041] The floating copper foil is connected to the first filter and the second filter respectively, providing a zero-potential floating ground point for the filter, which helps to further improve the stability and anti-interference ability of the signal. The copper foil area is not less than 50mm², the minimum edge spacing with the flexible printed circuit symmetrical dipole antenna is 5mm, and the isolation is greater than 50dBc. These requirements ensure the effectiveness and safety of the floating copper foil.

[0042] The UHF electronic tag is connected to the first filter and the second filter respectively, receives the inquiry signal, and outputs the response signal. The response signal is in the same frequency as the inquiry signal, ensuring the synchronization and consistency of the signal. Frequency range: 850MHz to 960MHz. This frequency range is suitable for a variety of communication scenarios, ensuring the wide applicability of the terminal response device.

[0043] In this embodiment, the isolation between the terminal antenna of the DAS indoor distributed system and the terminal transponder in the embodiment of the present application is approximately 15-20 dBc.

[0044] In the prior art, ordinary electronic tags attached to antennas have a wide frequency adaptation range. Mobile signals and signals sent by readers and writers will be received at the same time, and mobile signals are stronger than signals sent by readers and writers. Therefore, ordinary electronic tags not only cannot receive signals from readers and writers, but also generate intermodulation interference after receiving mobile signals, affecting mobile reception. However, the embodiment of the present application eliminates mobile signal interference by setting a first filter and a second filter in front of the terminal response device. Because ordinary electronic tags are floating objects without a real grounding point, the filter has poor performance without grounding. The embodiment of the present application also introduces floating grounding to solve the filter grounding problem.

[0045] In summary, the terminal response device ensures the efficiency and accuracy of the DAS indoor system fault diagnosis and positioning device. The flexible printed circuit symmetrical dipole antenna, filter, floating ground copper foil and ultra-high frequency electronic tag work together to achieve stable signal reception, transmission and analysis. At the same time, the specific requirements and design of these components also ensure the safety and reliability of the device.

[0046] In practical applications, the terminal response device can quickly locate the fault point in the DAS indoor distribution system and provide timely and accurate information support to the operation and maintenance personnel, thereby effectively improving the stability and operation efficiency of the system.

[0047] In the embodiment of the present application, it is assumed that the query signal power transmitted by the fault diagnosis and positioning device at the source end is P t , the received response signal amplitude is P r , the isolation between the terminal antenna and the terminal response device of the DAS indoor distributed system is 15-20dBc, taking the middle value of 17.5dBc; the switch reflection loss is 8dBc, and the 5G signal source transmission power is P S , then the DAS room distribution system loss can be calculated as: L DAS =(P t -P r +43) / 2; 5G signal power at the terminal antenna port of DAS indoor distributed system: P SI =P S -L DAS ; The sensitivity of the terminal response device is -15dBm, the reliable receiving sensitivity is -10dBm, and the loss of the DAS indoor distribution system is generally 20-30dBc. It can be calculated that the minimum transmission power of the inquiry signal of the fault diagnosis and positioning device at the source end is 40dBm; the minimum sensitivity is 40-110=-70dBm; the actual minimum value should be -75dBm. The current inquiry carrier leakage cancellation technology can cancel the effect of 75dB, which requires the inquiry signal and the response signal separator in the fault diagnosis and positioning device at the source end to have a minimum port isolation of: 40+75-75+5 (demodulation signal-to-noise ratio) = 45dBc. Only a 4-port circulator can achieve this isolation level.

[0048] Although the operating frequency of the fault diagnosis and positioning carrier signal does not use the mobile communication frequency, its high and low operating frequencies are both mobile communication operating frequencies. In the DAS indoor distributed system, the transmission power of many mobile communication frequency bands is as high as 43dBm, 46dBm, 48dBm, and 50dBm. These high-power signals cause serious interference to the receivers of the source-end fault diagnosis and positioning device and the end response device in the embodiment of the present application, especially the end response device receiver.

[0049] The interference elimination of the fault diagnosis and positioning device at the source end mainly relies on the high-inhibition, low-loss metal cavity resonant combiner. The most serious spurious co-frequency interference value of the device is -30dBm / 10kHz, which needs to be suppressed to -90dBm / 10kHz so that the receiving sensitivity of the fault diagnosis and positioning device will not be affected. Therefore, it is more appropriate to require the combiner port isolation of 65dBc.

[0050] However, it is not so convenient to add a filter to the end response device, because the end response device is a floating object with no conductor connecting it to the ground. If the filter end is not grounded, the out-of-band suppression index will be seriously reduced or even fail.

[0051] In order to solve the problem of eliminating interference in the end-responder, the floating ground design of the aircraft is introduced into the end-responder. Floating grounding means that there is no conductor connected to the ground, and it can also achieve the standard of safe and reliable 0V potential close to the ground. The reason why the floating ground copper foil of the end-responder keeps the potential from rising is that the filter ground terminal discharges the high-frequency charge on the floating ground copper foil, through the two paths of structural capacitance and space radiation between the floating ground copper foil and the end antenna ground plate of the DAS indoor distribution system. Therefore, the area of ​​the floating ground copper foil must be large enough and cannot affect the antenna performance of the responder. Therefore, the copper area of ​​the floating ground copper foil of the end-responder in the embodiment of the present application is not less than 50mm 2 Try not to lay floating copper foil between the two radiating arms of the symmetrical dipole. If it is unavoidable, lay it on the center line between the two arms. This is the high-frequency zero potential point of the antenna and has the least impact on the antenna. The minimum distance between the edge of the floating copper foil and the edge of the flexible printed circuit symmetrical dipole antenna is 5mm to ensure that the isolation between the two is greater than 50dBc.

[0052] It should be noted that, in the present application, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises one..." does not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be noted that the scope of the method and device in the embodiment of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0053] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A DAS indoor distributed system fault diagnosis and positioning device, characterized in that: The device comprises: A fault diagnosis and positioning device at the information source end, used to receive instructions from the management terminal and output an inquiry signal; A combiner, connected to the source-end fault diagnosis and locating device and receiving a mobile signal input, for combining the inquiry signal and the mobile signal so that the inquiry signal and the mobile signal are transmitted on the same path and mutual interference between the inquiry signal and the mobile signal is eliminated; The terminal response device is attached to the antenna housing of the DAS indoor distribution system, and is used to receive and analyze the inquiry signal and output a response signal with a unique ID number; the number of the terminal response devices is the same as the number of the antenna housings.

2. The DAS room system fault diagnosis and positioning device according to claim 1, characterized in that: The source end fault diagnosis and positioning device comprises: An inquiry signal and response signal separator, connected to the combiner via a radio frequency port, for separating the inquiry signal from the response signal; An inquiry signal generator, connected to the inquiry signal and response signal separator, for generating the inquiry signal; A reply signal interference canceller, connected to the inquiry signal and reply signal separator, for eliminating the co-frequency interference of the inquiry signal leakage on the reply signal; A reply signal decoder and amplitude measurer, connected to the reply signal interference canceller, for parsing the ID number of the reply signal and measuring the amplitude of the reply signal; The device control and data processor are respectively connected to the inquiry signal generator and the response signal decoder and amplitude measurer, and are used to receive instructions from the management terminal through the data input / output interface circuit, control the working process of the source end fault diagnosis and positioning device, analyze and process the measurement results of the response signal decoder and amplitude measurer, and output a measurement report.

3. The DAS room system fault diagnosis and positioning device according to claim 1, characterized in that: The terminal response device comprises: A flexible printed circuit symmetrical dipole antenna, the flexible printed circuit symmetrical dipole antenna comprising a response chip interface, a first radiation dipole arm and a second radiation dipole arm, for receiving the inquiry signal and transmitting the response signal to the DAS indoor distribution system; A first filter, inserted between the first radiation dipole arm and the transponder chip interface, for eliminating interference of the mobile signal on the terminal transponder; A second filter, inserted between the second radiation dipole arm and the transponder chip interface, for eliminating interference of the mobile signal to the terminal transponder; Floating copper foil, connected to the first filter and the second filter respectively, for providing a zero potential floating ground point for the first filter and the second filter; The ultra-high frequency electronic tag is connected to the first filter and the second filter respectively, and is used to receive the inquiry signal and output the response signal; the response signal has the same frequency as the inquiry signal.

4. The DAS room system fault diagnosis and positioning device as claimed in claim 3, characterized in that: The copper coating area of ​​the floating copper foil is not less than 50mm 2 .

5. The DAS room system fault diagnosis and positioning device according to claim 3 or 4, characterized in that: The minimum edge spacing between the floating copper foil and the flexible printed circuit symmetrical dipole antenna is 5 mm; the isolation between the floating copper foil and the flexible printed circuit symmetrical dipole antenna is greater than 50 dBc.

6. The DAS room system fault diagnosis and positioning device as claimed in claim 3, characterized in that: The frequency range of the UHF electronic tag is 850 MHz to 960 MHz.

7. The DAS room system fault diagnosis and positioning device as claimed in claim 1, characterized in that: The management terminal includes a central network management and a local computer.

8. The DAS room system fault diagnosis and positioning device as claimed in claim 3, characterized in that: The first filter and the second filter are surface acoustic wave filters or bulk acoustic wave filters.

9. The DAS room system fault diagnosis and positioning device as claimed in claim 2, characterized in that: The power of the inquiry signal is ≥10W, the inquiry signal and response signal separator is a four-port circulator with a port isolation greater than 45dB and a power capacity greater than 20W, and the operating frequency of the four-port circulator is the same as or includes the passband frequency of the end response device.

10. The DAS indoor system fault diagnosis and positioning device as claimed in claim 2, characterized in that: The combiner has a port isolation greater than 65dBc and a third-order intermodulation index lower than Metal cavity resonator.

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