A monitoring device for a radio antenna system and a method for improving monitoring accuracy

Abstract

The application discloses a kind of sky feeder system monitoring equipment and the method for improving monitoring precision, including first port, direct current separation circuit, S parameter monitoring module, antenna tilt angle monitoring circuit, ARM processor, modulation and demodulation circuit, signal power conversion circuit, temperature monitoring circuit, sound-light alarm and second port;The radio frequency feeder of sky feeder system is connected with the first port, by multiplexing the radio frequency feeder of sky feeder system, directly series connection access any position of sky feeder system, flexible arrangement, different needs of different users are fully met, without increasing cable and other accessories to complete direct current feed, data communication etc. between each sky feeder system monitoring equipment, the power value of any point position in sky feeder system interior, standing wave ratio, and antenna tilt angle etc. important performance parameters are monitored in real time.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of very high frequency air-ground communication, in particular to a sky-feed line system monitoring device and a method for improving monitoring precision. BACKGROUND

[0002] In a radio communication system, the performance index of a sky-feed line system directly affects the communication distance and effect of the communication system. In the field of very high frequency air-ground communication, the sky-feed line system is composed of a radio frequency feed line, a radio frequency lightning arrester, a switching cable, an antenna and the like, and is connected in the following manner: one end is connected to the radio frequency interface of a communication device, extends for tens of meters, and the other end is an antenna installed on a mounting pole (or a tower).

[0003] In daily work, the following problems exist: no matter whether the antenna oscillator and other components are loosened due to wind blowing, the antenna inclination angle is abnormal, or a high frequency cable is bitten by a mouse, water enters any connection position, or components are aged, the performance index of the sky-feed line system will be reduced, and even seriously out of tolerance. From the perspective of system security, it is necessary to monitor the power value of any point of the sky-feed line system, the standing wave ratio of any point, the antenna inclination angle and the like in real time, to automatically alarm when the performance index is abnormal, and to assist the staff to quickly determine the faulty component.

[0004] At present, in the field of very high frequency air-ground communication, the monitoring of the performance index of the sky-feed line system is only rough standing wave ratio monitoring at the radio frequency interface end of the communication device, and important performance indexes such as the antenna inclination angle are not considered. SUMMARY

[0005] The present application solves the technical problem that there is a lack of a device for monitoring the performance index of the sky-feed line system in the field of very high frequency air-ground communication, and aims to provide a sky-feed line system monitoring device and a method for improving monitoring precision, to multiplex the radio frequency feed line of the sky-feed line system, to complete direct current feeding and data communication between the sky-feed line system monitoring devices arranged at different positions in addition to the normal transmission of the receive / transmit signals of the communication device, to assist the staff to determine the faulty component of the sky-feed line system when the index is abnormal, and to realize real-time monitoring of the antenna inclination angle.

[0006] The present application is implemented by the following technical scheme:

[0007] A sky-feed line system monitoring device, comprising a first port, a direct current isolation circuit, an S parameter monitoring module, an antenna inclination angle monitoring circuit, an ARM processor, a modulation and demodulation circuit, a signal power conversion circuit, a temperature monitoring circuit, an audible and visual alarm and a second port.

[0008] The radio frequency feeder of the antenna feeder system is connected with the first port; the input end of the direct current isolation circuit is connected with the first port, the output end is connected with the input end of the S parameter monitoring module, the output end of the S parameter monitoring module is connected with the second port, the S parameter monitoring module, the antenna tilt angle monitoring circuit, the modulation and demodulation circuit, the signal power conversion circuit, the temperature monitoring circuit and the sound and light alarm are connected with the ARM processor respectively, the signal power conversion circuit and the modulation and demodulation circuit are connected with the radio frequency feeder through the first port respectively, and the modulation and demodulation circuit and the antenna tilt angle monitoring circuit are connected with the signal power conversion circuit respectively.

[0009] Further, the switch is connected with the direct current isolation circuit in parallel, and the S parameter monitoring module is connected with the radio frequency feeder through the switch and the first port.

[0010] Further, the S parameter monitoring module comprises an S parameter monitoring circuit and a signal sampling circuit, the S parameter monitoring circuit is connected with the second port, and the signal sampling circuit is connected with the ARM processor.

[0011] Further, the signal power conversion circuit comprises a power management module, a 9-core connector and a serial port conversion circuit, the 9-core connector is connected with the ARM processor through the serial port conversion circuit, the serial port conversion circuit is used for mutual conversion of TTL signals and RS-422 signals; the 9-core connector is connected with external equipment and a 24V power supply through RS-422 signal lines, and feeds the 24V power supply signal to the radio frequency feeder and the power management module; the power management module is used for filtering the received 24V power supply signals of the 9-core connector and the radio frequency feeder, and converting the 24V power supply signals into voltage values required by the modulation and demodulation circuit, the ARM processor and the serial port conversion circuit.

[0012] Further, the modulation and demodulation circuit comprises an ASK modulation circuit and an ASK demodulation circuit, the ASK modulation circuit is used for ASK modulating a square wave signal output by the ARM processor and a 2.176MHz carrier signal, and outputting the ASK modulated signal to the radio frequency feeder through the first port; the ASK demodulation circuit is used for demodulating the modulated 2.176MHz signal received from the radio frequency feeder, and restoring the square wave signal to the ARM processor.

[0013] Further, the antenna tilt angle monitoring circuit adopts a sensor with a model of MPU-6050.

[0014] Further, the modulation and demodulation circuit adopts an analog chip with a model of MAX9947.

[0015] The prior art monitoring of the performance indexes of the antenna feeder system is mostly only rough standing wave ratio monitoring at the radio frequency interface end of the communication equipment, and the important performance indexes of the antenna tilt angle and the like are not considered, in order to flexibly monitor the performance indexes of the antenna feeder system, an independent development is made on an antenna feeder system monitoring device, which can be flexibly connected in series at the interface end (referred to as the antenna end) of the antenna of the antenna feeder system, at an arbitrary position (referred to as the intermediate end) in the radio frequency feeder, and at the radio frequency interface end (referred to as the ground end) of the communication equipment, and the like, real-time monitoring of the power values, the standing wave ratios, and the important performance indexes such as the antenna tilt angle of each part of the antenna feeder system is performed, and then the staff is assisted to judge the fault parts of the antenna feeder system when the indexes are abnormal. Moreover, the antenna feeder system monitoring device directly connects in series in the antenna feeder system by multiplexing the radio frequency feeder of the antenna feeder system, without increasing cables and the like to complete the direct current feeding, data communication, and the like between the antenna feeder system monitoring devices, and the antenna feeder system monitoring device is automatically configured as the working modes corresponding to the antenna end, the intermediate end, and the ground end according to the feeding path (9-core connector / radio frequency feeder), the installation mode (horizontal installation for the ground end, vertical installation for the intermediate end, and vertical installation for the antenna end), and the configuration of the external device to the device through RS-422.

[0016] If the amplitude values of the forward and reverse power monitoring signals in the S parameter monitoring module are directly used to calculate the power values and the standing wave ratios in the above monitoring device, method errors will be caused due to the loss of part of the signal components, and inherent errors will be caused due to the discreteness of the performance indexes of each antenna feeder monitoring device itself at different environmental temperatures and different working frequency points, therefore, in order to improve the monitoring precision of the power values and the standing wave ratios, the application provides a method for improving the monitoring precision of the antenna feeder system monitoring device, comprising the following steps:

[0017] Step S1, obtaining the forward and reverse power monitoring signals;

[0018] Step S2, sampling the forward and reverse power monitoring signals to obtain the discrete sampling signal sequences of the forward and reverse power monitoring signals;

[0019] Step S3, performing FFT operation on the discrete sampling signal sequences of the forward and reverse power monitoring signals to obtain the frequency spectrums of the forward and reverse power monitoring signals, and to obtain the energy values of the frequency spectrums of the forward and reverse power monitoring signals;

[0020] Step S4, calculating the power values and the standing wave ratios according to the energy values of the frequency spectrums of the forward and reverse power monitoring signals;

[0021] Step S5, using a look-up table method, according to the actual environment temperature and working frequency obtained by the temperature monitoring circuit, looking up the corresponding correction table to correct the power value and the standing wave ratio.

[0022] The specific process of obtaining the correction table in step S5 is as follows:

[0023] The standard radio frequency signal generated by the radio frequency signal source is connected to the antenna feeder system monitoring device connected with the standard load, monitoring test is carried out under different environment temperatures, and a group of monitoring data at fixed frequency intervals is obtained under each environment temperature condition; the inherent error of each data of each group of monitoring data and the actual value is calculated to obtain the correction table.

[0024] Compared with the prior art, the present application has the following advantages and beneficial effects:

[0025] 1. An antenna feeder system monitoring device and a method for improving monitoring precision, by multiplexing the radio frequency feeder of the antenna feeder system, directly connecting to any position of the antenna feeder system in series, flexibly arranging, fully meeting different needs of different users, without increasing cables and other accessories to complete direct current feeding, data communication and the like among various antenna feeder system monitoring devices, and monitoring important performance parameters such as power value, standing wave ratio and antenna tilt angle of any point inside the antenna feeder system in real time.

[0026] 2. An antenna feeder system monitoring device and a method for improving monitoring precision, the antenna feeder system monitoring device is connected in series to any part of the antenna feeder system, the device automatically enters the corresponding working mode to form an antenna feeder system monitoring system, without the need for staff monitoring, the device can set normal power value, standing wave ratio alarm threshold and antenna tilt angle alarm threshold, once the actual monitoring value exceeds the alarm threshold, the device automatically performs sound and light alarm, at the same time, sends alarm information to the outside through the RS-422 serial port; real-time monitoring of performance indicators of each part of the antenna feeder system, assisting in judging the fault parts of the antenna feeder system when the working is abnormal.

[0027] 3. An antenna feeder system monitoring device and a method for improving monitoring precision, using FFT calculation method and look-up table method to process method error and inherent error affecting monitoring precision respectively, improving the monitoring precision of different environment temperatures and different working frequency points. BRIEF DESCRIPTION OF DRAWINGS

[0028] The drawings described herein are used to provide further understanding of the embodiments of the present application, constitute a part of the present application, and do not constitute a limitation on the embodiments of the present application. In the drawings:

[0029] Figure 1 It is an internal structure schematic diagram of the monitoring device of the present application;

[0030] Figure 2Connection diagram for the use of the device of the invention in a sky- feed line system.

[0031] Figure 3 Connection diagram between devices of the invention in a sky- feed line system.

[0032] Figure 4 Calibration test block diagram for the monitoring device of a sky- feed line system. DETAILED DESCRIPTION

[0033] In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with embodiments and drawings. The illustrative embodiments of the present application and their descriptions are only used to explain the present application and not as a limitation to the present application.

[0034] In the following description, numerous specific details are set forth to provide a thorough understanding of the present application. However, it will be apparent to one of ordinary skill in the art that the present application can be practiced without the specific details. In other instances, well-known structures, circuits, materials or the like have not been described in detail in order to avoid obscuring the present application.

[0035] Throughout the specification, reference to "one embodiment", "an embodiment", "one example" or "an example" means that a particular feature, structure, or characteristic described in connection with the embodiment or example is included in at least one embodiment of the application. The appearances of the phrases "in one embodiment", "an embodiment", "in one example" or "an example" in various places in the specification are not necessarily all referring to the same embodiment or example. Furthermore, the particular features, structures, or characteristics can be combined in any suitable

[0036] In the description of the present application, it needs to be understood that the terms "front", "back", "left", "right", "up", "down", "vertical", "horizontal", "high", "low", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation to the scope of protection of the present application.

[0037] Example 1

[0038] As Figure 1As shown, the antenna feeder system monitoring device of the present application comprises a first port, a direct current isolation circuit, an S parameter monitoring module, an antenna tilt angle monitoring circuit, an ARM processor, a modulation and demodulation circuit, a signal power conversion circuit, a temperature monitoring circuit, an audible and light alarm and a second port; the radio frequency feeder of the antenna feeder system is connected with the first port; the input end of the direct current isolation circuit is connected with the first port, the output end is connected with the input end of the S parameter monitoring module, the output end of the S parameter monitoring module is connected with the second port, the S parameter monitoring module, the antenna tilt angle monitoring circuit, the modulation and demodulation circuit, the signal power conversion circuit, the temperature monitoring circuit and the audible and light alarm are connected with the ARM processor respectively, the signal power conversion circuit and the modulation and demodulation circuit are connected with the radio frequency feeder through the first port respectively, the modulation and demodulation circuit and the antenna tilt angle monitoring circuit are connected with the signal power conversion circuit respectively, and the antenna feeder monitoring device further comprises a switch, the switch is connected with the direct current isolation circuit in parallel, and the S parameter monitoring module is connected with the radio frequency feeder through the switch and the first port.

[0039] Specifically, the direct current isolation circuit is used for cutting off the direct current 24V entering the communication device / antenna end; the switch is used for closing to connect the direct current 24V when working in the intermediate end mode; the antenna tilt angle monitoring circuit is used for monitoring the tilt angle data of the antenna, and the antenna tilt angle monitoring circuit adopts a sensor with the model MPU-6050; the ARM processor is used for managing the device, calculating the power value, calculating the standing wave ratio value, calculating the antenna tilt angle, communicating with the external device and the like; the temperature monitoring circuit is used for monitoring the environment temperature of the device; and the audible and light alarm circuit is used for issuing the audible and light alarm when the actual monitoring value of the important performance indexes such as the power value, the standing wave ratio and the antenna tilt angle exceeds the set alarm threshold.

[0040] The S parameter monitoring module comprises an S parameter monitoring circuit and a signal sampling circuit, the S parameter monitoring circuit is connected with the second port, and the signal sampling circuit is connected with the ARM processor; the S parameter monitoring circuit is used for monitoring the forward / reverse power P F / P R of the signal passing through the circuit; and the signal sampling circuit is used for performing ADC conversion and the like on the forward / reverse power P F / P R .

[0041] The signal power conversion circuit comprises a power management module, a 9-core connector and a serial port conversion circuit, the 9-core connector is connected with the ARM processor through the serial port conversion circuit, and the serial port conversion circuit is used for mutual conversion between the TTL signal and the RS-422 signal; the 9-core connector is connected with the external device and the 24V power supply through the RS-422 signal line, and feeds the 24V power supply signal to the radio frequency feeder and the power management module; and the power management module is used for filtering the 24V power supply signals received by the 9-core connector and the radio frequency feeder, and converting them into the voltage values required by the modulation and demodulation circuit, the ARM processor and the serial port conversion circuit.

[0042] The modulation and demodulation circuit includes an ASK modulation circuit and an ASK demodulation circuit, the ASK modulation circuit is used for ASK modulation of a square wave signal output by the ARM processor and a 2.176MHz carrier signal, and the ASK modulation circuit outputs the ASK modulated signal to the radio frequency feeder through the first port; the ASK demodulation circuit is used for demodulation of the modulated 2.176MHz signal received from the radio frequency feeder, and the ASK demodulation circuit restores the square wave signal and transmits the square wave signal to the ARM processor, specifically, the ASK modulation and demodulation circuit adopts an analog chip with a model of MAX9947.

[0043] As shown in Figure 2 , the typical connection mode of the sky feeder system monitoring device accessing the sky feeder system is that a sky feeder system monitoring device is connected in series at the interface end of the antenna (referred to as the antenna end), an arbitrary position in the radio frequency feeder (referred to as the middle end) and the radio frequency interface end of the communication device (referred to as the ground end), etc. In order to have interchangeability, the software and hardware technical states of each sky feeder system monitoring device are completely consistent. In addition to normally transmitting the receiving / transmitting signals of the communication device, the radio frequency feeder of the sky feeder system also simultaneously completes the direct current feeding and data communication between the monitoring devices.

[0044] As shown in Figure 3 , the sky feeder system monitoring device connects each device in series through the multiplexing radio frequency feeder, and the device automatically configures the working mode of the antenna end, the middle end and the ground end according to the feeding path (9-core connector / radio frequency feeder), the configuration of the device by the external device through RS-422 and the installation mode of the device (horizontal installation mode at the ground end, vertical installation mode at the middle end and vertical installation mode at the antenna end), and the specific working processes of different working modes are as follows:

[0045] Antenna end working mode: when the radio frequency signal exceeding the minimum monitoring value of the monitoring device enters the device, the S parameter monitoring circuit outputs the available forward / reverse power monitoring value (P F / P R ); the signal sampling circuit is used for ADC conversion of the forward / reverse power P F / P R ; the ARM processor calculates the power value and the standing wave ratio of the antenna interface end; the ARM processor obtains the antenna tilt angle data output by the tilt angle monitoring circuit through the I 2 C bus; the ARM processor packages the above monitoring values to form a square wave signal, and sends the square wave signal and a 2.176MHz carrier signal to the ASK modulation circuit; the ASK modulation circuit ASK modulates the square wave signal and the 2.176MHz carrier signal to form an ASK_2M signal, and sends the parameters such as the power value, the standing wave ratio and the antenna tilt angle of the antenna interface end to the ground end through the radio frequency feeder, and in this working mode, the ground end supplies power to the device through the radio frequency feeder;

[0046] Intermediate end working mode: basically consistent with the antenna end working mode, the difference is that the switch is in closed state, not to cut off the direct current 24V, at the same time, the antenna tilt angle data is not monitored, in this mode, the ground end supplies power to the device through the radio frequency feeder;

[0047] Ground end working mode: monitor the power value and standing wave ratio of the radio frequency interface end of the communication device, the monitoring method is consistent with the antenna end; at the same time, the ASK_2M signal transmitted by the radio frequency feeder from the antenna end and the intermediate end is demodulated by the ASK demodulation circuit, the square wave signal is sent to the ARM processor, and the ARM processor calculates the power value, standing wave ratio and antenna tilt angle of the antenna end and the intermediate end; the ARM processor collects the power value, standing wave ratio and antenna tilt angle of the antenna end, and the power value and standing wave ratio of the intermediate end and the ground end to form a TTL level signal, and the serial conversion circuit completes the conversion of the TTL signal and the RS-422 signal, and finally communicates with the external device in real time through the RS-422 serial port; in this mode, the +24V power supply input from the outside through the 9-core connector supplies power to the device, and at the same time, the ground end monitoring device feeds the antenna end and the intermediate end monitoring device through the radio frequency feeder.

[0048] In summary, the antenna feeder monitoring device directly connects into the antenna feeder system at any position through the radio frequency feeder of the multiplexing antenna feeder system, and is flexibly arranged to fully meet the different needs of different users, without the need to increase cables and other accessories to complete the direct current feeding, data communication and other functions among the antenna feeder system monitoring devices. The power value, standing wave ratio and antenna tilt angle of any point in the antenna feeder system are monitored in real time. The device automatically enters the corresponding working mode according to the installation position, without the need for staff to monitor, and the normal power value, standing wave ratio alarm threshold and antenna tilt angle alarm threshold can be set. Once the actual monitoring value exceeds the alarm threshold, the device automatically performs sound and light alarm, and at the same time, sends the alarm information to the outside through the RS-422 serial port. The performance indicators of each part of the antenna feeder system are monitored in real time, and the fault part of the antenna feeder system can be judged when the device works abnormally.

[0049] Example 2

[0050] The embodiment is different from embodiment 1 in that if the amplitude values of the forward and reverse power monitoring signals in the S parameter monitoring module are directly used to calculate the power value and the standing wave ratio in the above monitoring device, method errors will be caused due to loss of part of signal components; meanwhile, inherent errors will be caused due to certain discreteness of the performance indexes of each antenna feeder monitoring device itself in different environmental temperatures and different working frequency points, therefore, in order to improve the monitoring precision of the power value and the standing wave ratio, the embodiment provides a method for improving the monitoring precision of the antenna feeder system monitoring device, first, the frequency spectrum of the forward and reverse power monitoring signals is obtained by using the FFT operation, then the energy values of the frequency spectrum are substituted into the formula to calculate the power value and the standing wave ratio, and the method errors are reduced; then, the inherent errors are corrected by using the table lookup method, and the method specifically includes the following steps:

[0051] Step S1, the forward power monitoring signal and the reverse power monitoring signal are obtained;

[0052] Step S2, the forward power monitoring signal and the reverse power monitoring signal are respectively sampled to obtain the discrete sampling signal sequences of the forward and reverse power monitoring signals;

[0053] Step S3, the discrete sampling signal sequences of the forward and reverse power monitoring signals are respectively subjected to the FFT operation to obtain the frequency spectrum of the forward and reverse power monitoring signals, and the energy values of the frequency spectrum of the forward and reverse power monitoring signals are obtained;

[0054] Step S4, the power value and the standing wave ratio are calculated according to the obtained energy values of the frequency spectrum of the forward and reverse power monitoring signals;

[0055] Step S5, the table lookup method is used to look up the corresponding correction table according to the actual environmental temperature and the working frequency obtained by the temperature monitoring circuit to correct the power value and the standing wave ratio.

[0056] Specifically, since the calculation formula of the power value and the standing wave ratio is:

[0057] The power value P: P = 10 5 *P F , wherein the units of P, P F , P R are milliwatts;

[0058] The standing wave ratio VSWR:

[0059] , wherein P F is the forward power monitoring value, P R is the reverse power monitoring value, V F is the forward monitoring voltage, and V R is the reverse monitoring voltage, and it can be seen from the above calculation formula that as long as P F / PR (Or V F / V R ) monitoring accuracy, the power value, the monitoring accuracy of the standing wave ratio can be improved.

[0060] First, reduce the method error, the specific process is:

[0061] It is known that the Fourier transform expression of the non-periodic continuous-time signal x(t) is as follows:

[0062]

[0063] In the above formula, x(t) is a continuous signal of t, sampling x(t) to obtain a discrete sampled signal sequence x(nT), n=0, 1, …, N-1, N is the sequence length; then the DFT operation is performed on the discrete signal x(nT):

[0064]

[0065] Wherein, k=0, 1, …, N-1, From the above formula, about N2 times of multiplication and N2 times of addition need to be calculated, and when N is relatively large, the calculation workload is quite large.

[0066] Therefore, the fast Fourier transform (FFT) is applied to perform FFT transform on the discrete sampled signal sequence of the forward / reverse power monitoring signal, to obtain the spectrum of P F and P R , and the energy value of the spectrum is obtained; then the energy value of the spectrum of P F and P R is substituted into the above calculation formula of the power value and the standing wave ratio, to calculate the power value and the standing wave ratio.

[0067] Then, the inherent error of the above power value and the standing wave ratio is corrected by using the table lookup method, and the specific method is:

[0068] The standard radio frequency signal generated by the radio frequency signal source is connected to the antenna feeder system monitoring device connected to the standard load, and monitoring test is performed at different environmental temperatures, and a group of monitoring data at fixed frequency intervals (covering the entire working frequency band) is obtained at each environmental temperature condition.

[0069] The following error calculation formula is used:

[0070] Power value error: P ESS =100*(P 监 -P 实 ) / P 实

[0071] Standing wave ratio error: VSWR ESS =100*(VSWR 监-VSWR 实 ) / VSWR 实

[0072] Calculate the inherent error between each data point and the actual value at different temperatures to obtain a correction table for each temperature condition;

[0073] When the antenna feeder system monitoring equipment is actually working, after obtaining the power value and VSWR through the above steps, the actual ambient temperature and operating frequency obtained by the equipment temperature monitoring circuit are used as addresses to find the corresponding inherent error in the correction table; the calculated power value and VSWR are compensated, thereby realizing the correction of inherent error.

[0074] This embodiment provides a specific example of obtaining a correction table, such as... Figure 4 The diagram shown illustrates the principle block diagram for calibration testing of the antenna feeder system monitoring equipment. Figure 4 After setting up the test environment, the pre-installed automatic calibration program developed for this invention on the PC is run. The program controls the radio frequency signal source to generate standard radio frequency signals of specified frequencies and amplitudes one by one. After the standard radio frequency signals are sent to the antenna feeder system monitoring equipment, the antenna feeder system monitoring equipment performs real-time monitoring and sends the monitoring results to the PC through the RS-422 interface. The automatic calibration program calculates and records the results to form a correction table.

[0075] Using the feeder system monitoring equipment, the power value and VSWR of the standard test signal and mismatched load were monitored at -25℃, +25℃ and +75℃. The errors before and after the accuracy improvement were calculated, as shown in Table 1 and Table 2.

[0076] Table 1 Power Value Monitoring Record Table

[0077]

[0078] Table 2 Standing Wave Ratio Monitoring Record Table

[0079]

[0080] As can be seen from Tables 1 and 2, the method in this embodiment reduces the errors in power value and VSWR, thus significantly improving the monitoring accuracy of the monitoring equipment.

[0081] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A monitoring device for an antenna feeder system, characterized in that, It includes a first port, a DC blocking circuit, an S-parameter monitoring module, an antenna tilt angle monitoring circuit, an ARM processor, a modulation and demodulation circuit, a signal power conversion circuit, a temperature monitoring circuit, an audible and visual alarm, and a second port. The RF feed line of the antenna feeder system is connected to the first port; the input of the DC blocking circuit is connected to the first port and the output is connected to the input of the S-parameter monitoring module. The output of the S-parameter monitoring module is connected to the second port. The S-parameter monitoring module, the antenna tilt angle monitoring circuit, the modulation and demodulation circuit, the signal power conversion circuit, the temperature monitoring circuit, and the audible and visual alarm are respectively connected to the ARM processor. The signal power conversion circuit and the modulation and demodulation circuit are respectively connected to the RF feed line through the first port. The modulation and demodulation circuit and the antenna tilt angle monitoring circuit are respectively connected to the signal power conversion circuit. It also includes a switch, which is connected in parallel with the DC blocking circuit. The S-parameter monitoring module is connected to the RF feeder through the switch and the first port. The signal power conversion circuit includes a power management module, a 9-pin connector, and a serial port conversion circuit. The 9-pin connector is connected to the ARM processor via the serial port conversion circuit, which is used for mutual conversion between TTL signals and RS-422 signals. The 9-pin connector is connected to external devices and a 24V power supply via an RS-422 signal line, and feeds the 24V power signal to the RF feed line and the power management module. The power management module is used to filter the received 24V power signal from the 9-pin connector and the RF feed line, and convert it into the voltage value required by the modulation and demodulation circuit, the ARM processor, and the serial port conversion circuit. A method for improving monitoring accuracy in the aforementioned antenna feeder system monitoring equipment includes: Step S1: Acquire the forward power monitoring signal and the reverse power monitoring signal; Step S2: Sample the forward power monitoring signal and the reverse power monitoring signal respectively to obtain discrete sampled signal sequences of the forward power and reverse power monitoring signals; Step S3: Perform FFT operation on the discrete sampled signal sequences of the forward power and reverse power monitoring signals respectively to obtain the spectrum of the forward power and reverse power monitoring signals, and obtain the energy value of the spectrum of the forward power and reverse power monitoring signals. Step S4: Calculate the power value and VSWR based on the energy values ​​of the obtained forward and reverse power monitoring signal spectra; Step S5: Using the lookup table method, based on the actual ambient temperature and operating frequency obtained by the temperature monitoring circuit, find the corresponding correction table and correct the power value and VSWR.

2. The antenna feeder system monitoring device according to claim 1, characterized in that, The S-parameter monitoring module includes an S-parameter monitoring circuit and a signal sampling circuit. The S-parameter monitoring circuit is connected to a second port, and the signal sampling circuit is connected to an ARM processor.

3. The antenna feeder system monitoring device according to claim 1, characterized in that, The modulation and demodulation circuit includes an ASK modulation circuit and an ASK demodulation circuit. The ASK modulation circuit is used to perform ASK modulation on the square wave signal output by the ARM processor and the 2.176MHz carrier signal, and output the ASK-modulated signal to the RF feed line through the first port. The ASK demodulation circuit is used to demodulate the modulated 2.176MHz signal received from the RF feed line and restore it to a square wave signal for transmission to the ARM processor.

4. The antenna feeder system monitoring device according to claim 1, characterized in that, The antenna tilt angle monitoring circuit uses a sensor of model MPU-6050.

5. The antenna feeder system monitoring device according to claim 1, characterized in that, The modulation and demodulation circuit uses an analog chip of model MAX9947.

6. The antenna feeder system monitoring device according to claim 1, characterized in that, The specific process of obtaining the correction table in step S5 is as follows: The standard radio frequency signal generated by the radio frequency signal source is connected to the monitoring equipment of the antenna feeder system that has been connected to the standard load. Monitoring tests are carried out under different ambient temperatures, and a set of monitoring data with fixed frequency intervals is obtained under each ambient temperature condition. Calculate the inherent error between each data point in each monitoring data set and the actual value to obtain a correction table.

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