Dynamic detection method and system for high-speed rail train control on-board equipment BTM and application

Abstract

The invention discloses a high-speed rail train control on-board equipment BTM dynamic detection method and system and application. The method belongs to the technical field of online detection methods for the BTM of the transponder of the motor train unit. The BTM dynamic detection system comprises a BTM detection console and a detection data management server, wherein the BTM detection console comprises detection equipment, a robot platform and a remote control terminal, and the detection data management server is in wired and / or wireless communication with the BTM detection console. According to the invention, the working parameters of the BTM can be systematically detected on line, the degradation trend of the BTM can be tracked, bad modules can be eliminated in time, the fault frequency of the train control on-board equipment due to transponder information loss or errors can be reduced, the availability of the train control on-board equipment can be enhanced, and the railway operation efficiency can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of an on-line detection method for a Balise Transmission Module (BTM) of a high-speed train control on-vehicle equipment. Background Art

[0002] The Balise Transmission Module (BTM, including a BTM main unit, a BTM antenna and connection cables) of a multiple unit train plays an important role in the safe and reliable operation and maintenance of high-speed train control on-vehicle equipment. It is an important information input source for the safety protection of the ATP system (Automatic Train Protection system), and plays a key role in operation inspection and advanced repair work. For example, the train control on-vehicle equipment performs operations such as train position correction, operation level conversion, control mode conversion, train speed limit control, etc. according to the balise information received by the BTM.

[0003] Balises are generally installed in a point-like manner in the train operation line, and contain line control information transmitted from the ground to the train on the high-speed railway line, including line gradient information, bridge and tunnel information, speed limit information, position information, special section information, and link information of adjacent balises, etc. Therefore, incorrect or missing transmission of balise information will directly affect the safety and efficiency of train operation control.

[0004] Moreover, the fault phenomena such as the loss of balises by the train control on-vehicle equipment, incorrect balise data, or receiving a balise message with all zeros frequently occur. To overcome this problem, an existing technical solution is to manually analyze after a balise fault occurs to determine whether the fault is caused by the BTM or the environment, and then make corresponding adjustments respectively, such as replacing the BTM antenna and main unit, or installing magnetic rings to filter interference, etc.; another existing technical solution is to install a detection balise for on-line detection of the BTM tooling. In the above two solutions, the former solution has to face many difficult-to-solve on-site technical problems, such as the lack of a detection platform for quantitatively analyzing the uplink and downlink performance of the BTM, the difficulty in quantitatively detecting the performance of the replaced antenna and main unit, the difficulty in systematically and accurately measuring the installation height, angle, and environmental requirements of the antenna, and the difficulty in detecting the electromagnetic environment, etc.; the latter solution cannot be operated portably, the test is relatively passive, and the test coverage is severely limited. Summary of the Invention

[0005] Aiming at the defects of the existing technology, the purpose of the present invention is to provide a dynamic detection method and a dynamic detection system for a Balise Transmission Module (BTM) of a high-speed train control on-vehicle equipment and an application method thereof. The system or method can systematically and on-line detect the working parameters of the BTM, track the degradation trend of the BTM, and timely eliminate defective modules, reduce the number of faults of the train control on-vehicle equipment caused by the loss or error of balise information, enhance the availability of the train control on-vehicle equipment, and improve the railway operation efficiency.

[0006] The technical solution of the present invention is as follows:

[0007] The BTM dynamic detection system for high-speed train control on-vehicle equipment includes a BTM detection console and a detection data management server that is communicatively connected to the console by wire and / or wirelessly. Among them, the BTM detection console includes detection equipment that can detect the data obtained by the BTM of the high-speed train control on-vehicle equipment and the status of the BTM, a robot platform carrying the detection equipment that can perform automated on-line detection of the BTM in the depot, and a remote control terminal that can remotely monitor the detection equipment and the robot platform; the detection data management server is communicatively connected to the remote control terminal by wire and / or wirelessly, and can analyze and manage the data collected by the BTM detection console.

[0008] According to some preferred embodiments of the present invention, the detection equipment includes a detection component, a detection antenna located on the detection component and communicatively connected to the BTM antenna, and an assembly component. Among them, the detection component includes a spectrum analyzer, a signal generator, an infrared detector, a camera, and a first controller that controls the detection component and the detection antenna.

[0009] According to some preferred embodiments of the present invention, the robot platform includes a robotic arm with the detection equipment mounted on its top, a lifting platform that raises and lowers the robotic arm, and a second controller that controls and powers the lifting platform and the robotic arm.

[0010] According to some preferred embodiments of the present invention, the detection equipment is fixed to the front end of the robotic arm through a standard 4U chassis, the detection antenna is fixed to the front end of the robotic arm through a non-metallic bracket, and the base of the robotic arm is fixed to the center of the top end of the lifting platform through a metal fastener. Among them, the standard 4U chassis, the non-metallic bracket, the metal fastener, etc. are the assembly components.

[0011] According to some preferred embodiments of the present invention, the lifting platform is provided with a number of omnidirectional wheels whose speed and direction can be controlled by a motor, and a number of cameras for detecting the surrounding environment.

[0012] According to some preferred embodiments of the present invention, the lifting platform adopts an aluminum alloy structure, can provide 24V and 48V DC power supplies, and can carry different loads.

[0013] The present invention further provides a BTM dynamic detection method based on the above BTM dynamic detection system for high-speed train control on-vehicle equipment, which includes: transporting the robot platform to below the BTM antenna to be detected or beside the corresponding transponder through the remote control terminal, detecting the status of the BTM antenna through the detection device and transmitting the corresponding detection data to the detection data management server, calculating and analyzing the detection data by the detection data management server, and transmitting the analysis result obtained from the calculation and analysis to the remote control terminal. The remote control terminal performs function regulation on the robot platform according to the analysis result. The function regulation includes: controlling the robot platform to perform one or more of directional movement, spatial positioning, obstacle avoidance, load stress detection, motion image recording, and running track recording.

[0014] The present invention further provides an application of the above BTM dynamic detection system or BTM dynamic detection method for high-speed train control on-vehicle equipment in one or more of the following: BTM downlink power supply signal performance detection, BTM uplink signal performance detection, evaluating the influence of uplink signal change on the BTM receiving transponder function, BTM degradation trend analysis and forming a warning analysis table, transponder data communication detection, BTM anti-interference detection, BTM radiation pattern estimation, transmission test between BTM and transponder, BTM remote power characteristic test, BTM maximum magnetic flux test, BTM antenna crosstalk test, BTM cable crosstalk test, transponder detection ability test, BTM uplink signal electrical characteristic test, BTM message processing test, BTM transponder sequence processing test.

[0015] According to some preferred embodiments of the present invention, the application is to evaluate the influence of uplink signal change on the BTM receiving transponder function through the BTM dynamic detection system, which includes:

[0016] (1) Remotely controlling the robot platform to transport the detection device to multiple main lobe area detection points and multiple side lobe area detection points of the BTM antenna, and detecting the quality of its uplink. Among them, the quality of the uplink includes: one or more of signal energy, center frequency, offset frequency, bit error rate, phase error, amplitude error, and transponder message reception correct rate;

[0017] (2) Through the detection data management server, the signal energy of the uplink at different detection points obtained is plotted as an uplink signal energy map;

[0018] (3) Performing correlation analysis on the obtained uplink signal energy map and the transponder message reception correct rate to determine the influence of uplink signal change on the BTM receiving transponder function;

[0019] Among them, taking the point 4200 mm directly below the BTM antenna as the origin, the coordinates of the main lobe region detection points are: (0 mm, 0 mm, 4200 mm), (0 mm, 1600 mm, 4200 mm), (0 mm, 3200 mm, 4200 mm),

[0020] (0 mm, 1600 mm, 5000 mm), (0 mm, 1600 mm, 6000 mm), (500 mm, 0 mm, 4200 mm),

[0021] (500 mm, 1600 mm, 4200 mm), (500 mm, 3200 mm, 4200 mm), (500 mm, 1600 mm, 5000 mm) and (500 mm, 1600 mm, 6000 mm); the coordinates of the side lobe region detection points are:

[0022] (1300 mm, 0 mm, 4200 mm), (1300 mm, 1600 mm, 4200 mm) and (1300 mm, 3200 mm, 4200 mm).

[0023] According to some preferred embodiments of the present invention, the application is to analyze the deterioration trend of the BTM through the BTM dynamic detection system and form a warning analysis table, which includes:

[0024] (1) Remote control the robot platform to transport the detection device to the side of a certain BTM antenna. Within a period of time, detect the communication quality at the BTM antenna through the detection device and record the detection data in chronological order;

[0025] (2) Conduct a correlation analysis with time as the horizontal axis and the root mean square of the analysis results of the detection data as the vertical axis to obtain a warning analysis table;

[0026] Among them, the communication quality includes one or more of the following:

[0027] Uplink quality: including one or more of signal energy, center frequency, offset frequency, bit error rate, phase error, amplitude error, and transponder message reception correct rate of the uplink;

[0028] Downlink quality: including the remote power and / or center frequency of the downlink.

[0029] According to some preferred embodiments of the present invention, the application is to analyze the deterioration trend of the BTM through the BTM dynamic detection system and form a warning analysis table, which includes:

[0030] (1) Chronologically, remotely control the robot platform to transport the detection device beside different BTM antennas of the same model. Within a period of time, detect the communication quality at different BTM antennas through the detection device, and record the detection data chronologically;

[0031] (2) Conduct a correlation analysis with time as the horizontal axis and the root mean square of the analysis results of the detection data as the vertical axis to obtain a warning analysis table;

[0032] Among them, the communication quality includes one or more of the following:

[0033] Uplink quality: includes one or more of the signal energy, center frequency, offset frequency, bit error rate, phase error, amplitude error, and transponder message reception correct rate of the uplink;

[0034] Downlink quality: includes the remote power and / or center frequency of the downlink.

[0035] The present invention has the following beneficial effects:

[0036] (1) The dynamic detection system or method of the present invention can perform periodic dynamic detection on the performance of BTM, timely discover the deterioration of the BTM module, and take corresponding measures for maintenance or replacement, which helps to reduce the number of failures of the on-board train control equipment caused by transponder information loss or error, and improve the reliability and safety of railway operation;

[0037] (2) The dynamic detection system or method of the present invention can perform regular performance detection on BTM to eliminate defective modules, ensure that the on-board train control equipment is always in good working condition, reduce the probability of equipment failure, reduce maintenance time and costs, and improve the efficiency and reliability of railway operation;

[0038] (3) Through the dynamic detection system or method of the present invention, a BTM performance detection database for all vehicle models in the jurisdiction can be established, realizing the collection and analysis of BTM performance big data, providing important reference and guidance for railway operation decision-making and equipment optimization, and promoting the development of the railway industry towards the direction of intelligence and digitization. Description of the Drawings

[0039] Figure 1 It is a schematic control structure diagram of a dynamic detection system.

[0040] Figure 2 It is a schematic control structure diagram of a detection console of a dynamic detection system.

[0041] Figure 3 It is a schematic structure diagram of a robot platform of a dynamic detection system.

[0042] Figure 4BTM radiation pattern estimation test structure in an application method of a dynamic detection system.

[0043] Figure 5 BTM remote power test structure diagram in an application method of a dynamic detection system.

[0044] Figure 6 Test structure diagram of maximum magnetic flux test in an application method of a dynamic detection system.

[0045] Figure 7 Test structure diagram of uplink test of cable crosstalk test in an application method of a dynamic detection system.

[0046] Figure 8 Test structure diagram of remote power signal of cable crosstalk test in an application method of a dynamic detection system. Detailed implementation manners

[0047] The present invention will be described in detail below with reference to embodiments and drawings. However, it should be understood that the embodiments and drawings are only used for exemplary description of the present invention, and do not constitute any limitation to the protection scope of the present invention. All reasonable transformations and combinations within the scope of the inventive concept of the present invention fall within the protection scope of the present invention.

[0048] In some specific implementation manners, referring to the attached Figure 1 , the BTM dynamic detection system of the present invention includes a BTM detection console and a detection data management server that is in wired and / or wireless communication connection with it. Among them, the BTM detection console includes a detection device that can detect the data obtained by the BTM of the high-speed train control on-vehicle equipment and the status of the BTM, a robot platform carrying the detection device that can perform automated online detection of the BTM in the depot, and a remote control terminal that can remotely monitor the detection device and the robot platform; the detection data management server is specifically in wired and / or wireless communication connection with the remote control terminal, and can analyze and manage the data collected by the BTM detection console.

[0049] More specifically, referring to the attached Figures 2 - 3 , the detection device 101 includes a detection component, a detection antenna located on the detection component and capable of communicating with the antenna of the BTM, and an assembly component. Among them, the detection component includes a spectrum analyzer, a signal generator, an infrared detector, a camera, and a first controller for controlling the detection component and the detection antenna.

[0050] The robot platform includes a robotic arm 102 with the detection device 101 mounted on the top, a lifting platform 103 for lifting the robotic arm 102, and a second controller for controlling and powering the lifting platform 103 and the robotic arm 102.

[0051] Further, in some specific embodiments, the detection device 101 can be fixed to the front end of the robotic arm 102 through a standard 4U chassis, the detection antenna can be fixed to the front end of the robotic arm 102 through a non-metallic bracket, and the base of the robotic arm 102 can be fixed to the center of the top of the lifting platform 103 through metal fasteners such as metal screws. Among them, the standard 4U chassis, non-metallic bracket, metal fasteners, etc. are the assembly components.

[0052] Further, in some specific embodiments, the lifting platform 103 is provided with 4 omnidirectional wheels whose speed and direction can be controlled by motors, and is provided with multiple cameras for detecting the surrounding environment.

[0053] In some specific embodiments, the lifting platform 103 adopts an aluminum alloy structure, can provide 24V and 48V DC power supplies, and carries different loads.

[0054] The remote control terminal can use, for example, a tablet computer connected to the detection device through Wifi. In some specific embodiments, the used tablet computer uses a control software developed with the Windows operating system and Qt. The functions of the control software include, for example, regulating the forward, backward, left, and right movement of the robot platform, controlling the 360° rotation of the robotic arm therein, and real-time displaying the current state of the BTM in video mode.

[0055] The detection data management server can use, for example, a common data server adopting a mysql + mongoDB database.

[0056] The above BTM dynamic detection system of the present invention can transport the robot platform under the BTM antenna to be detected, and detect the state of the BTM antenna through the detection device. Among them, the robot platform can realize functions such as motion control, spatial positioning, obstacle avoidance, load stress detection, motion image recording, and operation trajectory recording.

[0057] In a specific application method, the present invention can evaluate the influence of the change of the uplink signal on the function of the BTM transponder through the above BTM dynamic detection system, which includes:

[0058] (1) Transport the detection device to multiple main lobe area detection points and multiple side lobe area detection points of the BTM antenna through the robot platform, and detect the quality of its uplink. Among them, the quality of the uplink includes one or more of signal energy, center frequency, offset frequency, bit error rate, phase error, amplitude error, and correct reception rate of the transponder message;

[0059] (2) Draw the signal energy of the uplink at different detection points obtained into an uplink signal energy spectrum through the detection data management server;

[0060] (3) Correlate the obtained uplink signal energy spectrum with the correct reception rate of the transponder message to determine the impact of the uplink signal change on the BTM's function of receiving transponders.

[0061] In a specific embodiment, with the point 4200 mm directly below the BTM antenna as the origin, the coordinates of the main lobe region detection points are: (0 mm, 0 mm, 4200 mm), (0 mm, 1600 mm, 4200 mm),

[0062] (0 mm, 3200 mm, 4200 mm), (0 mm, 1600 mm, 5000 mm), (0 mm, 1600 mm, 6000 mm), (500 mm, 0 mm, 4200 mm), (500 mm, 1600 mm, 4200 mm), (500 mm, 3200 mm, 4200 mm), (500 mm, 1600 mm, 5000 mm) and (500 mm, 1600 mm, 6000 mm); the coordinates of the side lobe region detection points are: (1300 mm, 0 mm, 4200 mm), (1300 mm, 1600 mm, 4200 mm) and (1300 mm, 3200 mm, 4200 mm).

[0063] In a specific application method, the present invention can analyze the degradation trend of the BTM through the above BTM dynamic detection system and form a warning analysis table. The analysis can take a single transponder as the analysis object, detect the situation of this single transponder item by item in chronological order, and count the detection results of each detection item to form a warning analysis table with time as the horizontal axis and the root mean square of the detection results as the vertical axis. It can also take multiple transponders of the same type as the analysis object, count the detection situations of multiple transponders item by item in chronological order, and count the detection results of each detection item to form a warning analysis table with time as the horizontal axis and the root mean square of the detection results of multiple transponders as the vertical axis; wherein, the detection items include:

[0064] (1) Uplink quality, including one or more of the signal energy, center frequency, offset frequency, bit error rate, phase error, amplitude error, and correct reception rate of the transponder message of the uplink;

[0065] (2) Downlink quality, including the remote power and / or center frequency of the downlink.

[0066] Furthermore, through the above dynamic detection system, the present invention can at least achieve the following BTM dynamic detections: (1) Transponder data communication detection, including: detecting reliable transponder data communication, correct Balise detection, correct sidelobe management, and correct position reporting functions; detecting the correct processing logic of different telegram types by the system under telegraph switching and telegraph error states during the detection of the stable state; detecting the correct processing of different transponder sequences and the correct processing logic by the system when passing through the transponder at the maximum allowable speed and extremely low speed;

[0067] (2) BTM downlink power supply signal performance detection, including: detecting the characteristics of the BTM remote power supply signal and drawing the characteristics of the static downlink energy radiation pattern of the antenna unit;

[0068] (3) BTM uplink signal performance detection, including: detecting the ability of the on-vehicle equipment to process the boundary electrical values of the uplink signal characteristics and the characteristics of the uplink energy radiation pattern;

[0069] (4) Anti-interference detection, including: evaluating the performance of the physical crosstalk protection margin detection equipment according to the specified longitudinal and lateral conditions; verifying the antenna unit supervision function under the determined metal quality; verifying the crosstalk immunity with nearby cables (including LZB cables); supporting the detection of the influence of debris conditions, such as metal objects, ice, frost, water, etc.

[0070] The above dynamic detection system can also be applied to the following tests:

[0071] I. Radiation pattern estimation

[0072] The purpose of this test is to find the possible weakest transponder signal and activation flow. Under static conditions, the BTM antenna can detect the simulated transponder, which is used for the static geometric points in the upper area of the reference loop (for example: detecting the actions of the BTM and the remote power flow limited by Vth). The simulated transponder consists of a detection antenna and a signal generation module, and the core structure of the signal generation module is as Figure 4 shown. The test methods include:

[0073] (1) The signal generation module of the simulated transponder sends a nominal FSK uplink signal, and its initial current is set to the minimum controllable current (1 mA), and the closed-loop detection is carried out according to the compensation value of this current by the vector signal analyzer. The compensation value is the current value divided by the B factor of the reference loop, and the time and mileage information are set according to the speed of 100 km / h;

[0074] (2) The detection antenna is moved to different geometric test points through the robot platform for detection; the geometric test points include the test points located in the main lobe area, sidelobe area, and mutual interference area respectively;

[0075] (3) Observe the transponder message output by the BTM through ATP, and determine whether the uplink signal is above or below the receiving limit (Vth) of the BTM host, that is, the process of confirming the transponder antenna Ith. If it is greater than Ith, the message can be parsed; if it is less than Ith, the message cannot be parsed.

[0076] (4) If the uplink signal is above the limit value (Vth), it decreases in steps of 0.5 dB until the signal reaches below the limit value. For the case where the signal is below the limit value, it first increases in steps of 0.2 dB. When the increase reaches 7 dB, it then increases in steps of 0.5 dB up to 24 dB. If the signal reaches above the limit value during the process, it stops. At this time, record the actual limit value Ith.

[0077] (5) Keep the geometric test point and repeat steps (3)-(4).

[0078] (6) Under different test conditions, repeat steps (1)-(5). The test conditions and the selection of geometric test points are shown in Table 1 below:

[0079] Table 1 Selection of Test Conditions and Geometric Test Points in Radiation Pattern Estimation

[0080] Test conditions Main lobe region Side lobe region Mutual interference region Normal conditions √ √ √ Inclination √ √ Bump √ √ Iron rod √ √ √ Guardrail √ √ √ Guardrail metal plane √ √ Rail sleeper √ Other sleeper √ Loop line √ √ Metal object √ √ Brine √ Clean water √ Iron ore √ Ice on the antenna √

[0081] II. Transmission Test between BTM and Transponder

[0082] Measure the integration of the antenna unit - BTM combination test in terms of transponder detection, data transmission reliability, sidelobe management, and precise positioning under simulated dynamic conditions.

[0083] Transponder detection is defined as: during the test of the minimum time TDET, there is an energy field strength from the transponder higher than Vth, and TDET varies with speed. The simulated transponder consists of a detection antenna and a signal generation module, and the core structure of the signal generation module is as Figure 4 shown.

[0084] The test procedure is as follows:

[0085] (1) Control the detection antenna to move to the geometric test point with coordinates [X = 0, Y = 0, Z = maximum height].

[0086] (2) Set the time and mileage parameters, equivalent to a speed of 26 km / h.

[0087] (3) Adjust the output level of the signal generation module (with an accuracy within ±0.3 dB) to ensure that the BTM antenna can just detect the transponder signal:

[0088] (4) Use the determined data above to perform at least 10 subsequent scans, measure and record the peak value of the uplink current simulated in each transponder channel through a vector signal analyzer.

[0089] (5) Repeat steps (1)-(4), and perform traversal tests on the heights of all antennas according to all applicable speeds, starting from 20 km / h and stepping by 50 km / h up to 300 km / h.

[0090] (6) Repeat steps (1)-(5) under combinations of different longitudinal ranges, lateral displacements, and heights, without changing the physical positions of the antenna unit and the reference loop.

[0091] III. BTM Remote Power Characteristic Test

[0092] The remote power characteristic is confirmed by the situation of the remote power signal generated by the combination of the antenna unit and the BTM. Specifically, tests on the electrical characteristics (such as carrying frequency and noise) and modulation characteristics of the remote power signal need to be carried out. During the test, a simulated transponder is used for detection. The simulated transponder includes a signal generation module and a detection antenna. Among them, the core structure of the signal generation module is as Figure 5 shown.

[0093] The spectrum analyzer in the BTM dynamic detection system is set with the following parameters: center frequency = 27.095 MHz; scan frequency = ±100 kHz; resolution bandwidth = 100 Hz; video bandwidth = 100 Hz.

[0094] The test process is as follows:

[0095] (1) Control the detection antenna to move to the geometric test point with coordinates [X = 0, Y = 0, Z = maximum height].

[0096] (2) Set the RF switch so that any generator is connected to the spectrum analyzer.

[0097] (3) Turn on the transmission switch of the BTM.

[0098] (4) Measure and record the following characteristic values of the remote power signal generated by the BTM:

[0099] a) The frequency of the 27.095 MHz electromagnetic field;

[0100] b) The noise carried by the 27.095 MHz electromagnetic field;

[0101] (5) Turn off the transmission switch of the BTM.

[0102] (6) Repeat steps (1) to (5) at the extreme values of the highest and lowest temperatures.

[0103] IV. BTM Maximum Magnetic Flux Test

[0104] In the measurement of the maximum magnetic flux, the reference loop needs to be loaded with various different load conditions. The core structure of the signal generation module is as Figure 6 shown.

[0105] The test procedure is as follows:

[0106] (1) Connect a load to the reference loop so that the total impedance in the circuit reaches 60Ω (40Ω) (for example, the sum of the impedance of the reference loop, the external impedance, and the impedance of the current induction unbalanced transformer is 60Ω or 40Ω);

[0107] (2) Control the detection antenna to move to the geometric test point with coordinates [X = 0, Y = 0, Z = maximum height];

[0108] (3) Turn on the transmission switch of the BTM;

[0109] (4) Record the power value of the power meter (PPM(1);

[0110] (5) Use the following formula to calculate the flux passing through the reference loop:

[0111]

[0112] where P PM1 refers to the power value measured by the power meter, with the unit of watt; B is the transfer matching coefficient of the reference loop; Zloop is the actual impedance of the reference loop under the condition of no antenna; Zload is the external load impedance connected to the reference loop; f27 is the frequency of the remote power (27.095 MHz); k is the calibration coefficient; Z A represents the input impedance of the attenuator;

[0113] (6) Re-execute steps (4) and (5) at different geometric test points.

[0114] (7) Turn off the transmission switch of the BTM, connect a load to the reference loop so that the total impedance of the circuit reaches j60Ω (j40Ω), and repeat steps (3) to (6).

[0115] (8) Turn off the transmission switch of the BTM, connect a load to the reference loop so that the total impedance of the circuit reaches -j60Ω (-j40Ω), and repeat steps (3) to (6).

[0116] V. BTM Antenna Crosstalk Test

[0117] The process of antenna crosstalk testing enables the simultaneous measurement of remote power and Up-link signals at the same location while keeping the remote power signal on. The core structure of the signal generation module is as shown in Figure 7 shown below.

[0118] The test procedure is as follows:

[0119] (1) Set an arbitrary signal generator to generate a nominal constant-amplitude FSK Up-link signal, and adjust the output power through the reference loop to reach I HIGH . Use a power meter to measure the current value. Note that the current value measured by the power meter needs to be compensated for the B factor of the reference loop (e.g., the target current to be measured should be the current separated by the desired reference loop B factor);

[0120] (2) Set an arbitrary signal generator to generate an Up-link signal, and the peak current I HIGH corresponding to it should be maintained at a certain level. Set the time and odometer information at a speed of 100 km / h;

[0121] (3) Observe the transponder message output by the BTM through the ATP to determine whether transponder detection occurs;

[0122] (4) If transponder detection does not occur, the peak current will increase at a rate of 0.5 dB per time until transponder detection occurs or reaches Iu3 + 20 dB; Repeat steps (2) and (3) until the crosstalk boundary edge is determined; Since the change in the command of the output power of any generator will cause the output power to change as expected, therefore, the operation in step (1) needs to be repeated at different current values;

[0123] (5) At the remaining geometric test points, repeat steps (1) to (4), and use an approximate I HIGH value for each separate point.

[0124] Among them, the evaluation formula for the crosstalk boundary is as follows:

[0125]

[0126] Among them, Ф is the actual flux at the geometric test point of the test, with the unit of nVs; Ф d2 is a parameter defined by the transmission characteristics of the transponder, with the unit of nVs; I CT is the actual current value when crosstalk occurs, with the unit of mA; I u3 is a parameter defined by the transmission characteristics of the transponder, with the unit of mA; Margin refers to the crosstalk boundary, with the unit of dB.

[0127] VI. BTM Cable Crosstalk Test

[0128] The cable crosstalk test method is used to examine the cables of potential antenna elements related to crosstalk. The test can be divided into the following two parts:

[0129] (1) Crosstalk of the upstream signal, from the cable to the antenna, with the signal generator core structure as Figure 8 shown. Among them, the resistance value of R1 is 350Ω, the resistance value of R2 is 400Ω, the distance D is in the x direction, within the range of -1000m to 1000m. This test determines the signal from the antenna, which can respectively generate currents of 2mA and 10mA in the cable when the antenna is at E = 93mm and E = 493mm;

[0130] The test process is as follows:

[0131] (A) Set the position of the antenna to D = -1000mm and E = 93mm;

[0132] (B) Set the signal generator to generate an FSK signal of 4.2MHz, which carries the message, and the current I is 2mA. For the recommended current probe, a current of 1mA can generate a voltage of 1mV across a 50Ω resistor. Therefore, the current is calculated using the following formula:

[0133]

[0134] where P is in W and I is in A;

[0135] (C) Observe the output data through the V1 interface to verify that the response of the antenna element is lower than Vth (determined by the BTM);

[0136] (D) Place the antenna elements at an interval of +40mm and a height of D = 1000mm. For each position, verify that the response of the antenna element is lower than Vth;

[0137] (E) Set the position of the antenna to D = -1000mm and E = 493mm.

[0138] (F) Set the signal generator to generate an FSK signal of 4.2MHz, which carries the message, and the current I is 2mA.

[0139] (G) Observe the BTM output transponder message through the ATP.

[0140] (H) Place the antenna elements at an interval of +40mm and a height of D = 1000mm. For each position, observe the BTM output transponder message through the ATP.

[0141] (2) Crosstalk of the downstream signal:

[0142] (A) Set the positions of the antennas as D = -1000 mm and E = 93 mm.

[0143] (B) Set the BTM to generate a remote power signal of 27 MHz.

[0144] (C) Record the reading of the power meter and name it P27LACH.

[0145] (D) Set the antenna spacing to +40 mm and the height to D = 1000 mm. For each position, record the reading of the power meter and name it P27LACH.

[0146] (E) Set the positions of the antennas as D = -1000 mm and E = 493 mm.

[0147] (F) Record the reading of the power meter and name it P27LACL.

[0148] (G) Set the antenna spacing to +40 mm and the height to D = 1000 mm. For each position, record the reading of the power meter and name it P27LACL;

[0149] The results of the tests are a set of values of P27LACH and P27LACL. Calculate the maximum value of the current for each set of data and name it I27ACH and I27ACL. For the recommended current probe, a current of 1 mA can generate a voltage of 1 mV across a 50 Ω resistor. Therefore, the current is calculated using the following formula:

[0150]

[0151] Here, the unit of P is W and the unit of I is A.

[0152] The value of I27ACH should be less than 25 mA.

[0153] The value of I27ACL should be less than 10 mA.

[0154] VII. Monitoring the Detection Ability of the Transponder

[0155] The test needs to be carried out under dynamic conditions. Information such as time and odometer is essential. The conditions of the antenna equipment are determined according to the requirements of the manufacturer;

[0156] The test should be carried out together with a reference loop. The reference loop is replaced by a metal profile defined by the metallic part in the track. The antenna unit is initially placed directly on top of the metal profile ([X = 0, Y = 0]), and the minimum height is defined by the manufacturer;

[0157] In case the alarm is not triggered, the distance d can increase in lengths of every 20 mm until the alarm goes off. In this process, the maximum value can be reached after at most three increases of 20 mm. In case the alarm is triggered, the same process is also executed, unless the distance d also decreases. The alarm is not triggered when the antenna unit is higher than the height specified by the manufacturer.

[0158] VIII. BTM Up-link Signal Electrical Characteristics Test

[0159] Systematically evaluate the ability of the BTM regarding the limits of the electrical characteristics of the Up-link signal (such as center frequency, frequency deviation, data rate, phase jitter, and amplitude jitter). To test the above characteristic values, a suitable test pattern needs to be generated by an arbitrary generator;

[0160] The signal input to the reference loop that generates the Up-link signal should be a non-ideal FSK signal. In addition, additional modulation is performed to simulate the transponder channel. Only the cases of a limited number of lateral back clutches and vertical height combinations are considered. The output signal of the BTM can be observed by the ATP to obtain the BTM output transponder message;

[0161] Antenna unit - The standard of the BTM is to be able to correctly process a certain sequence. The suitable test pattern for an arbitrary generator should vary with the following limit values of the simulated Up-link signal:

[0162] Center frequency = 4.234 MHz ± 200 kHz.

[0163] Frequency deviation = 282.24 kHz ± 5%.

[0164] Average data rate = 564.48 kbit / s ± 2.5%.

[0165] Amplitude jitter = ±1.5 dB.

[0166] IX. BTM Message Processing Test

[0167] This test systematically evaluates the ability of the BTM to process different types of messages (including message conversion);

[0168] In the test, for the input signal of the reference loop that generates the Up-link signal, the selection of the time scale should be coordinated with the measurement of the maximum speed in the lateral departure (Y direction) (except for the message conversion test under very low-speed conditions). Therefore, the odometer input signal also needs to be reasonably selected;

[0169] Antenna unit - The standard of the BTM is to be able to correctly process certain sequences. The message conversion test should be carried out under both high speed and low speed (contact time greater than 100 ms).

[0170] X. BTM Transponder Sequence Processing Test

[0171] The purpose of this test is to verify that the BTM correctly reports the transponder sequence in the transponder group. The BTM should be set to the normal operation mode. The judgment criteria are as follows:

[0172] The acceptance criterion is that during the simulated sequence, the BTM can correctly receive the transponder information. This means that it can correctly report some of the following characteristic values: message and location;

[0173] The total number of correct messages that do not overlap in terms of safety objectives in the received defined categories. The time reported by the BTM (the time can be used for the ERTMS / ETC kernel) for the received categories is:

[0174] Class A has no error correction

[0175] Class Bn has error correction (n is a number defined by the manufacturer)

[0176] It should be checked whether there are some logical associations in different data transmission fields of the BTM. Missing or incorrect reports mean that the transponder cannot receive data normally. At low speeds, the BTM should perform a report every 100 ms.

[0177] The above embodiments are only the preferred embodiments of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions falling within the idea of the present invention belong to the protection scope of the present invention. It should be pointed out that for those of ordinary skill in the art, improvements and refinements made without departing from the principle of the present invention should also be regarded as within the protection scope of the present invention.

Claims

1. High-speed railway train control on-board equipment BTM dynamic detection system, characterized by: It includes a BTM detection console and a detection data management server connected to it by wired and / or wireless communication, wherein the BTM detection console includes a detection device that can detect the data obtained by the high-speed railway train control on-board equipment BTM and the status of the BTM, a robot platform equipped with the detection device that can perform automatic online detection of the BTM in the warehouse, and a remote control terminal that can remotely monitor the detection device and the robot platform; the detection data management server is connected to the remote control terminal by wired and / or wireless communication, and can analyze and manage the data collected by the BTM detection console.

2. The high-speed railway train control on-board equipment BTM dynamic detection system according to claim 1 is characterized in that: The detection device includes a detection component, a detection antenna located on the detection component and capable of communicating with the BTM antenna, and an assembly component, wherein the detection component includes a spectrum analyzer, a signal generator, an infrared detector, a camera, and a first controller for controlling the detection component and the detection antenna.

3. The high-speed railway train control on-board equipment BTM dynamic detection system according to claim 1 is characterized in that: The robot platform includes a mechanical arm with the detection device installed on the top, a lifting platform for lifting the mechanical arm, and a second controller for controlling and supplying power to the lifting platform and the mechanical arm.

4. The high-speed railway train control on-board equipment BTM dynamic detection system according to claim 3 is characterized in that: The detection device is fixed to the front end of the mechanical arm through a standard 4U cage, the detection antenna is fixed to the front end of the mechanical arm through a non-metallic bracket, and the base of the mechanical arm is fixed to the top center of the lifting platform through a metal fastener. Among them, the standard 4U cage, non-metallic bracket, metal fastener, etc. are the assembly components.

5. The high-speed railway train control on-board equipment BTM dynamic detection system according to claim 3 is characterized in that: in, The lifting platform is provided with a plurality of universal wheels whose speed and direction can be controlled by motors, and is provided with a plurality of cameras for detecting the surrounding environment; and / or, the lifting platform adopts an aluminum alloy structure, can provide 24V and 48V DC power supplies, and can carry different loads.

6. A BTM dynamic detection method based on the BTM dynamic detection system of the high-speed railway train control on-board equipment according to any one of claims 1 to 5, characterized in that: It includes: The robot platform is carried to the bottom of the BTM antenna to be detected or next to the corresponding transponder by the remote control terminal, the BTM antenna status is detected by the detection equipment and the corresponding detection data is transmitted to the detection data management server, the detection data management server performs calculation and analysis on the detection data, and transmits the analysis results obtained by the calculation and analysis to the remote control terminal, and the remote control terminal performs functional regulation on the robot platform according to the analysis results, and the functional regulation includes: controlling the robot platform to perform one or more of directional movement, spatial positioning, obstacle avoidance, load stress detection, motion image recording, and operation trajectory recording.

7. Application of the BTM dynamic detection system for high-speed railway train control on-board equipment described in any one of claims 1-5 or the BTM dynamic detection method described in claim 6 to one or more of the following: BTM downlink power supply signal performance detection, BTM uplink signal performance detection, evaluation of the impact of uplink signal changes on the BTM receiving transponder function, BTM degradation trend analysis and formation of early warning analysis table, transponder data communication detection, BTM anti-interference detection, BTM radiation mode estimation, transmission test between BTM and transponder, BTM remote power characteristic test, BTM maximum magnetic flux test, BTM antenna crosstalk test, BTM cable crosstalk test, transponder detection capability test, BTM uplink signal electrical characteristic test, BTM message processing test, BTM transponder sequence processing test.

8. The use according to claim 7, characterized in that: The BTM dynamic detection system is used to evaluate the impact of uplink signal changes on the BTM transponder function, which includes: (1) remotely controlling the robot platform to transport the detection device to multiple main lobe detection points and multiple side lobe detection points of the BTM antenna to detect the quality of its uplink, wherein the quality of the uplink includes: one or more of signal energy, center frequency, offset frequency, bit error rate, phase error, amplitude error, and transponder message reception accuracy; (2) obtaining the uplink signal energy at different detection points through the detection data management server and plotting it as an uplink signal energy spectrum; (3) Correlation analysis is performed between the obtained uplink signal energy spectrum and the correct rate of transponder message reception to determine the impact of uplink signal changes on the BTM transponder function; Among them, taking the point 4200mm directly below the BTM antenna as the origin, the coordinates of the main lobe area detection point are: (0mm, 0mm, 4200mm), (0mm, 1600mm, 4200mm), (0mm, 3200mm, 4200mm), (0mm,1600mm,5000mm), (0mm,1600mm,6000mm), (500mm,0mm,4200mm), (500mm, 1600mm, 4200mm), (500mm, 3200mm, 4200mm), (500mm, 1600mm, 5000mm) and (500mm, 1600mm, 6000mm); the coordinates of the detection points in the side lobe area are: (1300mm,0mm,4200mm), (1300mm,1600mm,4200mm) and (1300mm, 3200mm, 4200mm).

9. The use according to claim 7, characterized in that: The BTM dynamic detection system is used to analyze the degradation trend of the BTM and form an early warning analysis table, which includes: (1) remotely controlling the robot platform to transport the detection device to a BTM antenna, detecting the communication quality of the BTM antenna by the detection device within a period of time, and recording the detection data in chronological order; (2) performing correlation analysis with time as the horizontal axis and the root mean square of the analysis results of the detection data as the vertical axis to obtain an early warning analysis table; The communication quality includes one or more of the following: Uplink quality: includes one or more of the uplink signal energy, center frequency, offset frequency, bit error rate, phase error, amplitude error, and transponder message reception accuracy; Downlink quality: includes the remote power and / or center frequency of the downlink.

10. The use according to claim 7, characterized in that: The BTM dynamic detection system is used to analyze the degradation trend of the BTM and form an early warning analysis table, which includes: (1) remotely controlling the robot platform to transport the detection device to different BTM antennas of the same model in chronological order, detecting the communication quality of the different BTM antennas by the detection device over a period of time, and recording the detection data in chronological order; (2) performing correlation analysis with time as the horizontal axis and the root mean square of the analysis results of the detection data as the vertical axis to obtain an early warning analysis table; The communication quality includes one or more of the following: Uplink quality: includes one or more of the uplink signal energy, center frequency, offset frequency, bit error rate, phase error, amplitude error, and transponder message reception accuracy; Downlink quality: includes the remote power and / or center frequency of the downlink.

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