A system and method for power beidou space-time service acquisition signal source and service quality checking

Abstract

The application discloses a system and method for power Beidou space-time service signal source and service quality verification, wherein a data analysis module constructs a multi-scene standardized test environment based on a satellite time service signal cooperative broadcasting algorithm constrained by a field environment, relies on a three-level time signal source verification model, takes a standard time reference signal as a reference, and respectively determines the signal source collection type of a 1PPS time signal and a standard time signal; through a field time accuracy verification method based on multi-dimensional data analysis and statistical determination, the accuracy of three time dimensions of the 1PPS time signal, an IRIG-B time signal and a serial port time message signal is calculated, a comprehensive time performance evaluation index is obtained, and signal source service quality quantitative determination is performed; through a week count verification method, the week count solution defects of a measured power time synchronization device are verified, and all-round verification and determination of the signal source collection type, the service quality and the device solution performance are realized.

Description

Technical Field

[0001] This invention relates to the field of power digitization technology, and more specifically, to a system and method for verifying the signal source and service quality of power BeiDou spatiotemporal services. Background Technology

[0002] The BeiDou Navigation Satellite System (BDS) adopts a world-first hybrid heterogeneous constellation configuration with medium and high orbits, consisting of a space segment, a ground segment, and a user segment working in tandem. It provides all-weather, all-time, high-precision, and highly reliable positioning, velocity measurement, and timing services to various users worldwide. Globally, its service performance is better than 9 meters for horizontal positioning, better than 10 meters for vertical positioning, better than 0.2 meters per second for velocity measurement, and better than 20 nanoseconds for timing. In the Asia-Pacific region, its performance is further improved, with both horizontal and vertical positioning accuracy better than 5 meters, velocity measurement accuracy better than 0.1 meters per second, and timing accuracy better than 10 nanoseconds.

[0003] One of the core functions of BDS is to provide high-precision time synchronization services, establishing a unified spatiotemporal reference for various applications, including the power industry. BDS generates a stable system time through an onboard high-precision atomic clock array and continuously broadcasts navigation messages to the ground via radio signals, containing precise transmission timestamps, satellite orbital parameters, and clock correction information. Ground user equipment receives signals from at least four satellites, calculates errors such as ionospheric delay, tropospheric delay, and relativistic effects during signal propagation, and determines the clock difference between the local clock and the satellite system time, thereby achieving precise synchronization between local time and Global Standard Time.

[0004] The power system time synchronization system is a critical infrastructure supporting the safe and stable operation of the power grid. It adopts a hierarchical master-slave topology, consisting of time synchronization system nodes deployed at national, regional, provincial, and municipal power grid dispatching agencies, as well as at substations and power plants at all levels. The time synchronization system employs a hierarchical time synchronization mode: each node has bidirectional time signal processing capabilities. On one hand, it receives wired time reference signals from the higher-level node through a dedicated power communication network to complete local clock synchronization calibration; on the other hand, it forwards high-precision time reference signals regenerated from the local clock to the lower-level node. This time synchronization mode ensures time consistency from the dispatching center to the terminal equipment at the power plants and substations.

[0005] The time synchronization devices in time synchronization systems at all levels are mainly power time synchronization devices, deployed in two main modes: single master clock and dual master clock. A single master clock time synchronization system consists of one master clock, multiple slave clocks, and a signal transmission medium, used to synchronize the time of the device or system being synchronized. The master clock typically has an interface to receive the wired time reference signal from the previous level time synchronization system. A dual master clock time synchronization system consists of two master clocks, multiple slave clocks, and a signal transmission medium, used to synchronize the time of the device or system being synchronized. The master clock typically has an interface to receive the wired time reference signal from the previous level time synchronization system.

[0006] The basic working principle of a time synchronization device is a process of receiving and transmitting synchronization. The device receives BeiDou satellite signals, performs synchronization calculations to obtain standard time information, and converts it into a time code (such as IRIG-B) that can be received and synchronized by various automation and relay protection devices in the power system, thus completing the time synchronization for downstream devices. To improve time synchronization stability, both the master and slave clocks possess high-precision self-timekeeping capabilities, ensuring the continuity of their output time signals. Currently, time synchronization devices used in power systems generally have dual satellite receiving antennas, using GNSS satellite signals as the time signal source to achieve high-precision time information calculation.

[0007] Currently, a comprehensive laboratory testing system has been established for time synchronization devices to ensure their functional performance meets the timing requirements of power services. Time synchronization devices are mainly used in core locations such as substations and are crucial for ensuring the stable operation of the power system. Therefore, using the domestically developed and controllable BeiDou system for power system timing is essential. However, there is currently a lack of theoretical methods to guide on-site testing and judgment of timing signal sources during material acceptance and quality sampling inspections, which may expose power grid timing applications to potential threats such as GPS spoofing interference. Furthermore, the complex application environment of substations and other locations means that incorrect antenna placement, building obstructions, and other factors can all affect timing accuracy. Currently, there is a lack of efficient and convenient on-site verification methods to guide the quality inspection and troubleshooting of time synchronization device timing services. Summary of the Invention

[0008] This invention proposes a system and method for verifying the signal source and service quality of BeiDou time and space service in power systems. This addresses the technical problem that existing power time synchronization equipment lacks a dedicated system for on-site, non-destructive identification of satellite timing signal source types and integrated verification of multi-dimensional timing service quality, making it impossible to accurately verify the source of BeiDou time and space service and the reliability of timing.

[0009] To address the aforementioned problems, according to one aspect of the present invention, a system for verifying the signal source and service quality of BeiDou spatiotemporal services for power grids is provided. The system includes: a portable satellite simulator, an active power divider, a reference time base synchronization module, a time synchronization device for the power grid under test, a power grid time synchronization output adapter module, a signal monitoring module, and a data analysis module. The portable satellite simulator outputs a radio frequency analog signal to an active power divider at its first output terminal and a reference frequency and a 1PPS time signal to a reference time base synchronization module at its second output terminal. The active power divider inputs radio frequency analog signals to the time synchronization device under test through two output ports; The reference time base synchronization module performs phase-locked frequency stabilization processing on the received reference frequency and 1PPS time signal to generate a standard time signal, and outputs the standard time base signal to the signal monitoring module. The time synchronization device under test converts the radio frequency analog signal into a 1PPS time signal and a time synchronization output signal, outputs the 1PPS time signal to the signal monitoring module, and outputs the time synchronization output signal to the power time synchronization output adapter module. The power timing output adapter module processes the timing output signal and outputs a standard timing signal to the signal monitoring module; The signal monitoring module outputs the received standard time reference signal, 1PPS time signal and standard time synchronization signal to the data analysis module; The data analysis module constructs a standardized test environment for multiple scenarios based on a satellite timing signal collaborative broadcasting algorithm constrained by the field environment. Relying on a three-level timing signal source verification model based on reliable signal tracking and verification, and using the standard time reference signal as a reference, it analyzes and determines the signal source acquisition type for the 1PPS time signal and the standard timing signal. Through a field timing accuracy verification method based on multi-dimensional data analysis and statistical judgment, it performs accuracy calculations on the three timing dimensions: the 1PPS time signal, the IRIG-B timing signal, and the serial port time message signal. It then combines the comprehensive deviation of each timing dimension with the number of equipment alarms for weighted fusion to obtain a comprehensive timing performance evaluation index, completing the quantitative judgment of signal source service quality. Finally, through a week count verification method based on a portable satellite simulator, it specifically verifies the week count calculation defects of the tested power time synchronization device, achieving comprehensive verification and judgment of signal source acquisition type, service quality, and equipment calculation performance.

[0010] Preferably, the active power divider, in conjunction with the portable satellite simulator, executes a satellite timing signal co-broadcasting algorithm under field environmental constraints, and performs synchronous calibration and fidelity processing on the two equally divided radio frequency analog signals, so that the power of the two output radio frequency analog signals is consistent and the time synchronization error meets the power timing verification accuracy requirements, thus adapting to the dual-channel signal access verification mechanism of the power time synchronization device under test. The portable satellite simulator is equipped with multiple output modes for radio frequency analog signals, including: non-BeiDou multi-system signal output mode, multi-system BeiDou extreme satellite reception hybrid output mode, and independent BeiDou system signal output mode.

[0011] Preferably, the portable satellite simulator outputs the radio frequency analog signal based on the constraints of the on-site environment, including: The initial set of visible satellites is obtained based on the preset minimum visible elevation angle: in, The lowest visible altitude angle, For the test time, For the first The elevation angle of the satellite relative to the test point; Introducing field constraint factors: in, For occlusion state factors, Signal strength factor As a multi-path influencing factor, Noise impact factor, These are the weighting coefficients; The final set of broadcast satellites was determined based on on-site constraint factors: in, The number of satellites to be broadcast to the target; The portable satellite simulator constructs standardized test scenarios for normal time synchronization, weak signal time synchronization, extreme satellite reception time synchronization, and independent BeiDou time synchronization based on the final broadcast satellite set.

[0012] Preferably, the data analysis module, using a three-level time signal source verification model and with the standard time reference signal as a reference, determines the signal source acquisition type of the 1PPS time signal and the standard time signal, including: The portable satellite simulator is controlled to output mode as non-BeiDou multi-system signal output mode. The time deviation sequence between the 1PPS time signal of the device under test and the standard time synchronization signal within a preset acquisition period is obtained. Based on the time deviation sequence and the decision threshold, it is determined whether the time synchronization is successful in non-BeiDou multi-system signal output mode. When the first judgment result is that the time synchronization is successful, the signal source acquisition type detection process ends. When the first judgment result is that time synchronization is unsuccessful, the output mode of the portable satellite simulator is controlled to be the multi-system BeiDou extreme satellite reception hybrid output mode. The time deviation sequence between the 1PPS time signal of the device under test and the standard time synchronization signal within the preset acquisition period is obtained. Based on the time deviation sequence and the decision threshold, it is determined whether the time synchronization is successful in the multi-system BeiDou extreme satellite reception hybrid output mode. When the second judgment result is that the time synchronization is successful, the signal source acquisition type detection process ends. When the second judgment result is that time synchronization is unsuccessful, the output mode of the portable satellite simulator is controlled to be the independent Beidou system signal output mode. The time deviation sequence between the 1PPS time signal of the device under test and the standard time synchronization signal within the preset acquisition period is obtained. Based on the time deviation sequence and the decision threshold, it is determined whether the time synchronization is successful in the independent Beidou system signal output mode. When the obtained third judgment result is that the time synchronization is successful, the signal source acquisition type detection process ends. If the third judgment result indicates that time synchronization is unsuccessful, the judgment on the signal source acquisition type and service quality will be re-executed.

[0013] Preferably, a field time synchronization accuracy verification method based on multi-dimensional data analysis and statistical judgment is used to perform accuracy calculations on the three time synchronization dimensions: 1PPS time signal, IRIG-B time synchronization signal, and serial port time message signal. The comprehensive deviation of each time synchronization dimension and the number of device alarms are then weighted and fused to obtain a comprehensive time synchronization performance evaluation index. This is used to quantitatively determine the signal source service quality, including: The data analysis module uses the standard time reference signal as a reference to perform accuracy calculations on the three types of time synchronization dimensions. The three types of time synchronization dimensions include: the 1PPS time signal output by the time synchronization device under test, the IRIG-B time synchronization signal corresponding to the standard time synchronization signal output by the power time synchronization output adapter module, and the serial port time message signal. Based on accuracy calculation, the maximum absolute deviation, average deviation, and root mean square jitter of each time synchronization dimension are obtained, and a risk coefficient is introduced to construct the comprehensive time synchronization deviation of each dimension, so as to realize the quantitative verification of multi-dimensional time synchronization accuracy.

[0014] Preferably, a weighted fusion calculation is performed on the comprehensive deviation of each time synchronization dimension and the number of equipment alarms to obtain a comprehensive time synchronization performance evaluation index; wherein, the weight coefficient of each time synchronization dimension is differentiated by the importance of power time synchronization services. The quality of service of the signal source is determined based on the comprehensive timing performance evaluation index.

[0015] Preferably, the verification of week count calculation defects in the tested power time synchronization device using a week count verification method based on a portable satellite simulator includes: The portable satellite simulator is connected to the time synchronization device under test via the active power divider. The portable satellite simulator is controlled to continuously broadcast satellite signals of the BeiDou system across all frequencies. The simulation start time is set, and the broadcast continues for a preset duration. Once the time synchronization device under test stably captures the satellite signals and outputs the time synchronization result normally, the initial stable time synchronization state calibration is performed. The operating status of the time synchronization device under test is monitored in real time, with the critical flip point of the week count in the simulation scenario as the judgment node. If the time synchronization device under test issues an alarm, it is determined that the week count of the time synchronization device under test is abnormal. If the time synchronization device under test does not issue an alarm, it is determined that the week count of the time synchronization device under test is normal.

[0016] Preferably, the data analysis module is further used to verify the week count calculation defects of the time synchronization device under test, including: The simulation time of the portable satellite simulator is switched sequentially to verify the week count defect of the time synchronization device under test.

[0017] Based on another aspect of the present invention, the present invention provides a method for verifying the quality of service (QoS) of a signal source based on the above-described system, the method comprising: The portable satellite simulator outputs an RF analog signal to an active power divider through its first output terminal, and outputs a reference frequency and a 1PPS time signal to a reference time base synchronization module through its second output terminal. The radio frequency analog signal is input to the time synchronization device under test through the two output ports of the active power divider; The received reference frequency and 1PPS time signal are phase-locked and stabilized by the reference time base synchronization module to generate a standard time signal, and the standard time base signal is output to the signal monitoring module. The measured time synchronization device converts the radio frequency analog signal into a 1PPS time signal and a time synchronization output signal, outputs the 1PPS time signal to the signal monitoring module, and outputs the time synchronization output signal to the power time synchronization output adapter module. The power timing output adapter module processes the timing output signal and outputs a standard timing signal to the signal monitoring module. The received standard time reference signal, 1PPS time signal, and standard time synchronization signal are output to the data analysis module through the signal monitoring module. The data analysis module constructs a standardized test environment for multiple scenarios based on a satellite timing signal collaborative broadcasting algorithm constrained by the field environment. Relying on a three-level timing signal source verification model based on reliable signal tracking and verification, and using the standard time reference signal as a reference, it analyzes and determines the signal source acquisition type for the 1PPS time signal and the standard timing signal. Through a field timing accuracy verification method based on multi-dimensional data analysis and statistical judgment, it performs accuracy calculations on the three timing dimensions: the 1PPS time signal, the IRIG-B timing signal, and the serial port time message signal. It then combines the comprehensive deviation of each timing dimension with the number of equipment alarms for weighted fusion to obtain a comprehensive timing performance evaluation index, completing the quantitative judgment of signal source service quality. Finally, through a week count verification method based on a portable satellite simulator, it specifically verifies the week count calculation defects of the tested power time synchronization device, achieving comprehensive verification and judgment of signal source acquisition type, service quality, and equipment calculation performance.

[0018] Based on another aspect of the present invention, the present invention provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the above-described method for verifying the signal source and service quality of a power Beidou spatiotemporal service.

[0019] This invention provides an electronic device, comprising: The aforementioned computer-readable storage medium; and One or more processors for executing a program in the computer-readable storage medium.

[0020] This invention provides a system and method for verifying the signal source and service quality of BeiDou spatiotemporal services for power grids. The system includes: a portable satellite simulator, an active power divider, a reference time base synchronization module, a power grid time synchronization device under test, a power grid time synchronization output adapter module, a signal monitoring module, and a data analysis module. The portable satellite simulator outputs a radio frequency analog signal to the active power divider at its first output terminal and a reference frequency and 1PPS time signal to the reference time base synchronization module at its second output terminal. The active power divider inputs the radio frequency analog signal to the time synchronization device under test through two output ports. The reference time base synchronization module performs phase-locked loop stabilization on the received reference frequency and 1PPS time signal to generate a standard time signal and outputs the standard time reference signal to the signal monitoring module. The time synchronization device under test converts the radio frequency analog signal into a 1PPS time signal and a time synchronization output signal, outputs the 1PPS time signal to the signal monitoring module, and outputs the time synchronization output signal to the power grid time synchronization output adapter module. The power grid time synchronization output adapter module processes the time synchronization output signal and outputs a standard time synchronization signal to... The signal monitoring module receives standard time reference signals, 1PPS time signals, and standard time synchronization signals, and outputs them to the data analysis module. The data analysis module constructs a standardized multi-scenario test environment based on a satellite time synchronization signal collaborative broadcasting algorithm constrained by the field environment. Relying on a three-level time synchronization signal source verification model based on reliable signal tracking and verification, and using the standard time reference signal as a reference, it analyzes and determines the signal source acquisition type for the 1PPS time signal and the standard time synchronization signal. Through a field time synchronization accuracy verification method based on multi-dimensional data analysis and statistical judgment, it performs accuracy calculations on three time synchronization dimensions: 1PPS time signal, IRIG-B time synchronization signal, and serial port time message signal. It then combines the comprehensive deviation of each time synchronization dimension with the number of equipment alarms for weighted fusion to obtain a comprehensive time synchronization performance evaluation index, completing the quantitative judgment of signal source service quality. Finally, through a week count verification method based on a portable satellite simulator, it conducts a special verification of the week count calculation defects of the tested power time synchronization device, achieving comprehensive verification and judgment of signal source acquisition type, service quality, and equipment calculation performance. The technical solution of this invention establishes a standardized and integrated power BeiDou spatiotemporal service verification system by building a multi-module collaborative verification architecture. It can synchronously and accurately collect and compare the reference time signal with various time synchronization signals output by the device under test, effectively realizing the accurate identification of satellite signal source acquisition type and comprehensive judgment of time synchronization service quality of power time synchronization device. It solves the shortcomings of traditional verification methods that cannot verify the source of device time synchronization signal and the reliability of spatiotemporal service on-site in an integrated manner, greatly improving the integrity, accuracy and standardization of on-site verification of power time synchronization equipment, and ensuring the stability and reliability of the spatiotemporal reference of the power system. Attached Figure Description

[0021] Exemplary embodiments of the present invention can be more fully understood by referring to the following figures: Figure 1 This is a system structure diagram of a power grid BeiDou spatiotemporal service acquisition signal source and service quality verification according to an embodiment of the present invention; Figure 2 A flowchart illustrating a three-level timing signal source verification process based on reliable signal tracking verification according to an embodiment of the present invention; and Figure 3 This is a flowchart of a method for verifying the signal source and service quality of a power grid BeiDou spatiotemporal service according to an embodiment of the present invention. Detailed Implementation

[0022] Exemplary embodiments of the invention will now be described with reference to the accompanying drawings. However, the invention may be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided to fully and completely disclose the invention and to fully convey its scope to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the drawings is not intended to limit the invention. In the drawings, the same units / elements are referred to by the same reference numerals.

[0023] Unless otherwise stated, the terms used herein (including technical terms) have their common meaning as understood by one of ordinary skill in the art. Furthermore, it is understood that terms defined in commonly used dictionaries should be understood to have a meaning consistent with the context of their relevant field, and not to be interpreted as having an idealized or overly formal meaning.

[0024] Figure 1 This is a system structure diagram of a power grid BeiDou spatiotemporal service acquisition signal source and service quality verification according to an embodiment of the present invention.

[0025] This invention provides a reliable satellite signal synchronization simulation based on an active power divider and a dual-source antenna. Most manufacturers incorporate signal input verification mechanisms into their time synchronization devices. The dual satellite signal input interfaces on the device must simultaneously receive power, and the processing unit must detect both signal inputs to execute the normal satellite signal acquisition and tracking process. If only one satellite signal is input, the device automatically alarms, affecting the normal output of external time synchronization signals. To address this mechanism, an active power divider is used to split the simulated signal from the portable satellite simulator into two equally powerful signals input to the device under test, thus allowing the device's own judgment logic to successfully execute subsequent test procedures. Furthermore, a satellite time synchronization signal co-broadcasting algorithm constrained by the field environment is designed to ensure high time synchronization and high fidelity characteristics when the two distributed signals arrive at the signal interface.

[0026] This invention provides a three-level timing signal source verification model based on reliable signal tracking verification. In power industry applications, BeiDou terminals typically treat BeiDou's timing or positioning functions as sub-functions, transmitting the corresponding timing and positioning results to relevant business functions for integrated application transmission. These terminals generally lack external data ports for directly outputting timing and positioning results. Traditional laboratory performance testing methods for BeiDou timing and positioning functions usually require disassembling the terminal and obtaining positioning and timing data from the TTL or PPS interfaces on its internal BeiDou board for testing. However, the integrity of the time synchronization device is crucial for its normal operation, and on-site technical supervision should generally not damage the terminal's physical form. Therefore, this invention proposes a three-level timing source verification model based on reliable tracking verification. Through a three-stage process—multi-system simulated signal verification, extreme satellite reception condition verification, and independent BeiDou signal verification—it determines which timing signal source the time synchronization device uses.

[0027] This invention provides an on-site verification method for time synchronization service accuracy and week count anomalies. Addressing the issue that existing testing methods cannot meet the service quality verification and inspection requirements of on-site time synchronization devices, this invention designs an on-site time synchronization accuracy verification method based on a portable satellite simulator and multi-dimensional data analysis and statistical judgment. Simultaneously, to effectively identify and prevent inaccurate time synchronization caused by manufacturers' incorrect week count design in hardware, a week count verification method based on a portable satellite simulator is designed. This method simulates satellite signals at potential fault time points and combines this with the time synchronization device's time synchronization output results for verification and troubleshooting of week count anomalies.

[0028] This invention primarily describes a method and process for identifying signal sources and verifying service quality for BeiDou spatiotemporal services in power grids using a portable satellite simulator. First, high-fidelity dual-input signal synchronization simulation is performed based on an active power divider to ensure the accuracy of the input signals used for verification testing. Second, a three-level time source verification model based on reliable signal tracking and verification is designed. Through a three-stage process—multi-system simulated signal verification, extreme satellite reception condition verification, and independent BeiDou signal verification—the time signal source used by the time synchronization device is determined. Finally, a method for verifying on-site time accuracy and troubleshooting week count anomalies is designed, providing reliable means for verifying terminal application performance and troubleshooting problems on-site.

[0029] like Figure 1 As shown, the present invention provides a system for verifying the signal source and service quality of Beidou spatiotemporal service for power grids. The system is characterized by comprising: a portable satellite simulator, an active power divider, a reference time base synchronization module, a time synchronization device for the power grid under test, a power grid time synchronization output adapter module, a signal monitoring module, and a data analysis module. The first output terminal of the portable satellite simulator outputs an RF analog signal to the active power divider, and the second output terminal outputs a reference frequency and a 1PPS time signal to the reference time base synchronization module. The active power divider inputs the radio frequency analog signal to the time synchronization device under test through two output ports; The reference time base synchronization module performs phase-locked frequency stabilization processing on the received reference frequency and 1PPS time signal to generate a standard time signal and outputs the standard time reference signal to the signal monitoring module. The time synchronization device under test converts the radio frequency analog signal into a 1PPS time signal and a time synchronization output signal, outputs the 1PPS time signal to the signal monitoring module, and outputs the time synchronization output signal to the power time synchronization output adapter module. The power timing output adapter module processes the timing output signal and outputs a standard timing signal to the signal monitoring module; The signal monitoring module outputs the received standard time reference signal, 1PPS time signal and standard time synchronization signal to the data analysis module; The data analysis module constructs a standardized test environment for multiple scenarios based on a satellite timing signal collaborative broadcasting algorithm constrained by the field environment. Relying on a three-level timing signal source verification model based on reliable signal tracking and verification, and using the standard time reference signal as a reference, it analyzes and determines the signal source acquisition type for 1PPS time signals and standard timing signals respectively. Through a field timing accuracy verification method based on multi-dimensional data analysis and statistical judgment, it performs accuracy calculations on three timing dimensions: 1PPS time signals, IRIG-B timing signals, and serial port time message signals. It then combines the comprehensive deviation of each timing dimension with the number of equipment alarms for weighted fusion to obtain a comprehensive timing performance evaluation index, completing the quantitative judgment of signal source service quality. Finally, through a week count verification method based on a portable satellite simulator, it specifically verifies the week count calculation defects of the tested power time synchronization device, achieving comprehensive verification and judgment of signal source acquisition type, service quality, and equipment calculation performance.

[0030] The field verification and testing system based on an active power divider provided by this invention comprises a portable satellite simulator, an active power divider, a reference time base synchronization module, a power time synchronization output adapter module, a signal monitoring module, a data analysis module, and a power time synchronization device under test. The specific system composition and topology are as follows: Figure 1As shown in the diagram, the portable satellite simulator generates configurable navigation signals from multiple systems such as BeiDou, GPS, and GLONASS, and outputs a reference frequency and a 1PPS time signal. Its RF analog signal output is distributed to the two signal input ports of the power time synchronization device under test via an active power divider. The reference frequency and 1PPS signal are sent to the reference time base synchronization module. After receiving the time and frequency signals, the input of the reference time base synchronization module obtains a unified system time base through phase-locked loop and frequency stabilization processing, and outputs it to the signal monitoring module for performance comparison and measurement of the terminal under test. One end of the signal monitoring module receives the reference standard time base, the other end receives the 1PPS signal from the power time synchronization device under test, and the other end receives the IRIG-B and other time synchronization output signals calculated and processed by the device under test. The data analysis module performs calculations and analysis on these three signals to obtain the final time source identification result and various performance index calculation results.

[0031] Preferably, the active power divider, in conjunction with a portable satellite simulator, executes a satellite timing signal co-broadcasting algorithm under field environmental constraints. It performs synchronous calibration and fidelity processing on the two equally divided radio frequency analog signals, ensuring that the power of the two output radio frequency analog signals is consistent and the time synchronization error meets the power timing verification accuracy requirements, thus adapting to the dual-channel signal access verification mechanism of the power time synchronization device under test. The portable satellite simulator can set multiple output modes for radio frequency analog signals, including: non-BeiDou multi-system signal output mode, multi-system BeiDou extreme satellite reception hybrid output mode, and independent BeiDou system signal output mode.

[0032] Preferably, the portable satellite simulator outputs radio frequency analog signals based on the constraints of the on-site environment, including: The initial set of visible satellites is obtained based on the preset minimum visible elevation angle: in, The lowest visible altitude angle, For the test time, For the first The elevation angle of the satellite relative to the test point; Introducing field constraint factors: in, For occlusion state factors, Signal strength factor As a multi-path influencing factor, Noise impact factor, These are the weighting coefficients; The final set of broadcast satellites was determined based on on-site constraint factors: in, The number of satellites to be broadcast to the target; The portable satellite simulator constructs standardized test scenarios for normal time synchronization, weak signal time synchronization, extreme satellite reception time synchronization, and independent BeiDou time synchronization based on the final broadcast satellite set.

[0033] This invention performs device initialization and reference time base configuration.

[0034] Configure satellite scene scripts for portable simulators, and set basic parameters such as the time period, geographical location, and number of visible satellites for simulation tests; Configure parameters such as signal power, ionospheric model, multipath model, obstruction model, and electromagnetic noise superposition to simulate different power field environments; The collaborative broadcasting of simulated satellite timing signals under field environmental constraints primarily uses test time, test location, satellite system type, number of visible satellites, signal power, obstruction conditions, multipath conditions, and noise conditions as inputs. First, the visibility status of each satellite over the test point is calculated. Then, based on on-site obstruction and the test target, the actual set of broadcasting satellites is selected. Finally, corresponding simulated signals from multiple satellite systems, such as BeiDou, GPS, and GLONASS, are generated. This algorithm can create multiple repeatable test scenarios on-site, including normal timing, weak signal timing, extreme satellite reception timing, and independent BeiDou timing, providing unified and controllable input conditions for subsequent timing signal source identification and timing accuracy verification.

[0035] Let the test time be... , No. The altitude angle of the satellite relative to the test point is The initial set of visible satellites is: in, This represents the lowest visible elevation angle. Further, a field constraint factor is introduced: in, For occlusion state factors, Signal strength factor As a multi-path influencing factor, Noise impact factor, These are weighting coefficients. The final set of broadcast satellites is selected based on on-site constraint factors. in, The target number of satellites to be broadcast. The portable satellite simulator generates simulated satellite signals from multiple systems such as BeiDou, GPS, and GLONASS based on the final set of broadcast satellites, thereby forming test scenarios such as normal time synchronization, weak signal time synchronization, extreme satellite reception time synchronization, and independent BeiDou time synchronization, providing controllable input for subsequent time synchronization signal source identification and time synchronization accuracy verification.

[0036] The portable simulator is started and outputs satellite navigation signals through the RF output port. The active power divider distributes the signal into two synchronous branch signals of different strengths. The two outputs of the power divider are connected to the time synchronization device under test through RF cables, so that the device under test can recognize the normal logic level and signal input, and will not judge the signal as an abnormal input state, thus preventing it from failing to perform the normal calculation and processing process.

[0037] The reference frequency and 1PPS reference pulse signal are provided to the reference time base synchronization module through the reference frequency / time interface. The reference time base synchronization module performs phase-locking and stabilization processing on the reference frequency and reference pulse to form a unified system time base reference, and allocates a unified time base to the signal monitoring module.

[0038] The timing output interfaces of the power time synchronization device under test, including 1PPS output, IRIG-B output, PTP / NTP network interface, etc., are connected to the corresponding channels of the signal monitoring module and data analysis module, respectively. The device under test starts the test in cold start mode.

[0039] Preferably, the data analysis module uses a three-level time signal source verification model, with the standard time reference signal as a reference, to determine the signal source acquisition type of the 1PPS time signal and the standard time signal, including: The portable satellite simulator is controlled to output mode of non-BeiDou multi-system signal output mode. The time deviation sequence between the 1PPS time signal of the device under test and the standard time synchronization signal within the preset acquisition period is obtained. Based on the time deviation sequence and the decision threshold, it is determined whether the time synchronization is successful in non-BeiDou multi-system signal output mode. When the first judgment result is that the time synchronization is successful, the signal source acquisition type detection process ends. When the first judgment result is that time synchronization is unsuccessful, the output mode of the portable satellite simulator is controlled to be a hybrid output mode of BeiDou and BeiDou extreme satellite reception under multiple systems. The time deviation sequence between the 1PPS time signal of the device under test and the standard time synchronization signal within the preset acquisition period is obtained. Based on the time deviation sequence and the decision threshold, it is determined whether time synchronization is successful in the hybrid output mode of BeiDou extreme satellite reception under multiple systems. When the second judgment result is that time synchronization is successful, the signal source acquisition type detection process ends. When the second judgment result is that time synchronization is unsuccessful, the output mode of the portable satellite simulator is controlled to be the independent Beidou system signal output mode. The time deviation sequence between the 1PPS time signal of the device under test and the standard time synchronization signal within the preset acquisition period is obtained. Based on the time deviation sequence and the decision threshold, it is determined whether time synchronization is successful in the pure independent Beidou system signal output mode. When the obtained third judgment result is that time synchronization is successful, the signal source acquisition type detection process ends. If the third judgment result indicates that time synchronization is unsuccessful, the judgment on the signal source acquisition type and service quality will be re-executed.

[0040] This invention provides a three-level timing signal source verification model based on reliable signal tracking and verification.

[0041] After connecting the instruments and equipment according to the aforementioned test system, and confirming that the satellite signal simulator and the device under test are working properly, the three-stage testing process begins. The specific process is as follows: Figure 2 As shown.

[0042] (1) First, broadcast simulated satellite signals from systems other than BeiDou, such as GPS, GLONASS, and GALILEO, for 20 minutes to perform multi-system simulated signal verification on the device under test, including: The portable simulator is controlled to broadcast simulated signals from GPS, GLONASS, GALILEO, and other systems (excluding BeiDou) with more than four satellites each for at least 20 minutes. The signal monitoring module periodically measures the time interval between the 1PPS output of the device under test and a reference 1PPS under a unified time base, obtaining a discrete-time deviation sequence. , of which The time deviation of each sampling is defined as ,in, In the first The time corresponding to the 1PPS edge of the device under test measured at each sampling time. The time synchronization success threshold is set to the reference 1PPS time output by the reference time base synchronization module within the same sampling period. .

[0043] If the device under test has no 1PPS signal output and the satellite acquisition and tracking identifier in the device's internal system displays "not acquired", it is determined that the timing of the terminal under test is unsuccessful, and the next stage of extreme satellite acquisition condition verification will continue.

[0044] If the satellite acquisition and tracking identifier of the internal system of the device under test displays "normal acquisition", and the deviation statistics during the test period are... If the timing signal source is not an independent BeiDou system, the test terminal is considered to have successfully synchronized with the time signal, and the testing process ends. The formula for calculating the deviation statistics is as follows: In the formula, This represents the average deviation over the testing period. This is the standard value for the deviation within the test period.

[0045] (2) Secondly, simultaneously broadcast signals from 3 BeiDou satellites and signals from more than 3 other satellite systems for 20 minutes to perform extreme satellite reception condition verification on the tested equipment, including: The portable simulator is controlled to broadcast signals from three BeiDou satellites, as well as signals from at least three other satellites such as GPS, GLONASS, and GALILEO (excluding BeiDou), for at least 20 minutes. The signal monitoring module periodically measures the time interval between the 1PPS output of the device under test and a reference 1PPS under a unified time base, obtaining a discrete-time deviation sequence. Then, based on the previous formula, the statistical value of the deviation within this period can be calculated. .

[0046] If the device under test has no 1PPS signal output and the satellite acquisition and tracking identifier in the device's internal system displays "not acquired", it is determined that the timing of the terminal under test has failed, and the next stage of independent BeiDou signal verification will continue.

[0047] If the satellite acquisition and tracking identifier of the internal system of the device under test displays "normal acquisition", and the deviation statistics during the test period are... If the timing signal source is not an independent BeiDou system, the test terminal is deemed to have successfully synchronized with the time signal, and the test process ends.

[0048] (3) Broadcast only BeiDou system signals with more than 4 satellites for 20 minutes to perform independent BeiDou signal verification on the device under test, including: The portable simulator is controlled to broadcast BeiDou system signals with more than four satellites for at least 20 minutes. The signal monitoring module periodically measures the time interval between the 1PPS output of the device under test and the reference 1PPS under a unified time base to obtain the discrete time deviation sequence. Then, based on the previous formula, the statistical value of the deviation within this period can be calculated. .

[0049] If the device under test has no 1PPS signal output and the satellite acquisition and tracking identifier in the device's internal system displays "not acquired", it is determined that the terminal under test may be faulty and unable to receive satellite signal timing normally. After troubleshooting, the testing process should be repeated.

[0050] If the satellite acquisition and tracking identifier of the internal system of the device under test displays "normal acquisition", and the deviation statistics during the test period are... If the timing signal is successfully synchronized, it is determined that the time synchronization signal source used by the device under test is an independent BeiDou system, and the testing process ends.

[0051] Preferably, a field time synchronization accuracy verification method based on multi-dimensional data analysis and statistical judgment is used to perform accuracy calculations on three time synchronization dimensions: 1PPS time signal, IRIG-B time synchronization signal, and serial port time message signal. The comprehensive deviation of each time synchronization dimension and the number of equipment alarms are then weighted and fused to obtain a comprehensive time synchronization performance evaluation index. This index is used to quantitatively determine the signal source service quality, including: The data analysis module uses the standard time reference signal as a reference to perform accuracy calculations on three types of time synchronization dimensions. The three types of time synchronization dimensions include: the 1PPS time signal output by the time synchronization device under test, the IRIG-B time synchronization signal corresponding to the standard time synchronization signal output by the power time synchronization output adapter module, and the serial port time message signal. Based on accuracy calculation, the maximum absolute deviation, average deviation, and root mean square jitter of each time synchronization dimension are obtained, and a risk coefficient is introduced to construct the comprehensive time synchronization deviation of each dimension, so as to realize the quantitative verification of multi-dimensional time synchronization accuracy.

[0052] Preferably, a weighted fusion calculation is performed on the comprehensive deviation of each time synchronization dimension and the number of equipment alarms to obtain a comprehensive time synchronization performance evaluation index; wherein, the weight coefficient of each time synchronization dimension is differentiated by the importance of power time synchronization services. The quality of service of the signal source is determined based on the comprehensive timing performance evaluation index.

[0053] This invention provides a method for on-site verification of time synchronization service accuracy and week count anomalies.

[0054] (1) Control the portable simulator to only broadcast BeiDou system signals. After the time synchronization device enters normal timing mode, perform a duration of The test used the reference time series registered by the reference time base synchronization module for that period of time. express.

[0055] The signal monitoring module monitors and measures the 1PPS output calculated by the time synchronization device under test in real time within the same time period, denoted as After receiving the BeiDou satellite signal, the time synchronization device calculates the timing result information. The adaptation module then decodes the protocol, extracting absolute time information (including year, month, day, hour, minute, second, week count, and seconds within the week), and converts it into a unified format timestamp. The output IRIG-B timing result timestamp is denoted as […]. The timestamp of the serial port time message timing result is recorded as .

[0056] At the set duration Within the observation time window, with reference time base synchronization module Based on this, the deviation statistics of the timing results for 1PPS, IRIG-B, and serial port time messages were calculated, including the maximum absolute value. (The worst-case scenario reflecting time synchronization accuracy), average value (System bias reflecting time deviation) and root mean square jitter (Reflects the level of time accuracy error jitter).

[0057] Based on 1PPS time synchronization deviation For example, the calculation formula is as follows: In the formula, The risk coefficient is typically set to 1.5. Considering the stringent requirements of power systems for time synchronization deviations, this coefficient can be used to amplify the impact of the maximum deviation, making the accuracy calculation results more sensitive to abnormal jumps and other situations.

[0058] Similarly, the overall timing deviation of IRIG-B can be calculated using the above formula. Overall deviation of serial port time message timing .

[0059] In addition, during the aforementioned time period, statistical analysis was performed on the alarm information that the tested terminal might generate to obtain the total number of alarms. The occurrence time and duration of different types of alarms are recorded; and combined with the time deviation sequence, it is determined whether the alarm corresponds to the actual time deviation anomaly, so as to identify false alarms and missed alarms.

[0060] The data analysis module can construct a comprehensive evaluation index of device time synchronization accuracy based on the combined time synchronization deviation of the three time synchronization methods and the number of alarms. This represents the overall time synchronization performance level of the tested power time synchronization device. The comprehensive evaluation index for time synchronization accuracy is shown in the following formula: In the formula, As importance weighting coefficients, assuming the four basic evaluation indicators are standardized to the same dimension, the magnitude of the weighting coefficient determines the different levels of attention paid to time accuracy, jitter, stability, and alarm behavior. These coefficients can be pre-calibrated according to specific standards or user needs to ensure the scientific and reasonable nature of the indicator evaluation results. Generally, the four weighting coefficients can be selected as follows: Because 1PPS time synchronization has a high level of accuracy, it is given a high weight level. In addition, fault alarms will directly affect the service reliability of the terminal, so they are also given a high weight level.

[0061] Finally, the time synchronization accuracy evaluation index output by the data analysis module is: The above indicators not only reflect the direct measurement accuracy error of the tested terminal, but also provide maintenance personnel with a comprehensive evaluation result obtained after weighted calculation.

[0062] Preferably, the week count verification method based on a portable satellite simulator is used to verify the week count calculation defects of the tested power time synchronization device, including: Connect the portable satellite simulator to the time synchronization device under test via an active power divider, control the portable satellite simulator to continuously broadcast satellite signals of the Beidou system across all frequencies, set the simulation start time, and continuously broadcast for a preset duration; after the time synchronization device under test stably captures the satellite signals and outputs the time synchronization result normally, perform initial stable time synchronization state calibration. The operating status of the time synchronization device under test is monitored in real time, with the critical reversal time of the week count in the simulation scenario as the judgment node. If the time synchronization device under test issues an alarm, it is determined that the week count of the time synchronization device under test is abnormal; if the time synchronization device under test does not issue an alarm, it is determined that the week count of the time synchronization device under test is normal.

[0063] Preferably, the data analysis module is also used to verify the week count calculation defects of the time synchronization device under test, including: The simulation time of the portable satellite simulator was switched sequentially to verify the week count defect of the time synchronization device under test.

[0064] This invention provides a method for on-site verification of week count anomalies.

[0065] Both the BeiDou and GPS systems use a system time representation of "week count (WN) + week seconds (SOW)". WN starts at 00:00:00 UTC on January 1, 2006, and increases weekly. SOW is set to 0 seconds at Sunday BDT 00:00:00. The system uses 20 bits to store SOW, accumulating to 604,799 seconds before resetting to zero. The BeiDou system used 13 bits to store WN, which can count 8,191 weeks (approximately 156 years), while the GPS system used 10 bits, which can count 1,024 weeks (approximately 19.6 years). When the system's designed storage capacity for WN is reached, the corresponding week count overflows and restarts from 0. Terminals that did not consider this situation in their design will incorrectly reset to zero at the point of week count overflow, recalculating the time to the initial system design time, resulting in incorrect time synchronization.

[0066] To prevent time synchronization issues caused by the aforementioned week count problem, a field verification method for week count anomalies is designed. The specific process is as follows: The portable simulator is synchronized with the time-controlled device under test via an active power divider. Figure 1 The topology is connected to control the portable simulator to broadcast the full frequency signals of the Beidou system.

[0067] First, the portable simulator was set to start at 23:40:00 UTC on April 6, 2019, and broadcast continuously for 30 minutes. After the time synchronization device under test successfully captured and output the time synchronization result, it was checked whether the terminal under test could respond at the GPS week count flip time of 23:59:42 on April 6, 2019, which was recorded as... Normal time synchronization.

[0068] If the tested terminal is If the LCD display panel and fault indicator show "fault loss of synchronization" at a certain moment, it is determined that the time synchronization device under test has an abnormal week count problem, and the calculated time has an incorrect flip problem at that moment.

[0069] If the tested terminal is If no synchronization failure alarm occurs, the statistical value of the 1PPS accuracy deviation of the tested terminal during the test period is further calculated. ,if If the time synchronization is successful, it is determined that the tested terminal has successfully synchronized with the time and there is no GPS week count error.

[0070] Following the above logic, repeat the test to verify whether the tested terminal has an abnormal week count defect at the time points of "23:59:46 UTC on December 25, 2162" and "23:59:59 UTC on August 16, 2025".

[0071] Through the above process, it can be determined whether the tested time synchronization device has GPS week count abnormality, BeiDou system week count abnormality, and whether the terminal has GPS count abnormality at the time of GPS count expiration under the BeiDou time frame.

[0072] This invention employs an active power divider to split the simulated signal from a portable satellite simulator into two equally powerful input signals to the time synchronization device under test. This successfully passes the signal validity verification mechanism designed by the terminal manufacturer, ensuring accurate reception of the simulated test signal by the terminal under test in the field testing environment, which is a prerequisite for making judgments on various aspects. Furthermore, a satellite timing signal co-broadcasting algorithm constrained by the field environment is designed to ensure the synchronization accuracy of the two received signals from the terminal under test, achieving high-fidelity reproduction of real satellite signal reception and processing, thus guaranteeing the accuracy and reliability of the method proposed in this invention.

[0073] This invention proposes a three-level timing signal source verification model based on reliable signal tracking and validation, overcoming the drawback of traditional laboratory signal source determination tests requiring terminal disassembly. It designs a three-stage verification process: multi-system simulated signal verification, extreme satellite reception condition verification, and independent BeiDou signal verification. The model uses the 1PPS deviation statistics obtained from the terminal display panel's status flags and existing external interface output data to jointly determine the timing signal source used by the time synchronization device under test. This achieves accurate determination of the terminal's timing mode without damaging the terminal's external form.

[0074] This invention proposes a field time synchronization accuracy verification method based on multi-dimensional data analysis and statistical judgment. By real-time monitoring of the multi-dimensional time synchronization results of the tested terminal, a comprehensive evaluation index for time synchronization accuracy is designed, taking into account multiple factors such as 1PPS accuracy, IRIG-B accuracy, serial port time message accuracy, and fault alarm level. Furthermore, through the design of a service importance weighting factor, a comprehensive verification method for the reliability and accuracy of field application time synchronization terminals is achieved. In addition, addressing typical design flaws of terminal manufacturers, a field verification method for week count anomalies is designed. Through simulated enumeration tests of potential anomaly flip-over time points, potential hidden dangers in field equipment can be quickly identified, preventing serious problems such as errors in power system fault records.

[0075] This invention proposes a method and system for verifying the signal source and service quality of BeiDou time and space service in power systems. It can determine the timing signal source of the time synchronization device under test in typical power application environments, and at the same time realize the on-site verification and troubleshooting of the timing service performance accuracy and defects.

[0076] This invention employs an active power divider to split the simulated signal from a portable satellite simulator into two equally powerful input signals to the time synchronization device under test. This successfully passes the signal validity verification mechanism designed by the terminal manufacturer, ensuring accurate reception of the simulated test signal by the terminal under test in the field testing environment, which is a prerequisite for making judgments on various aspects. Furthermore, a satellite timing signal co-broadcasting algorithm constrained by the field environment is designed to ensure the synchronization accuracy of the two received signals from the terminal under test, achieving high-fidelity reproduction of real satellite signal reception and processing, thus guaranteeing the accuracy and reliability of the method proposed in this invention.

[0077] This invention proposes a three-level timing signal source verification model based on reliable signal tracking and validation, overcoming the drawback of traditional laboratory signal source determination tests requiring terminal disassembly. It designs a three-stage verification process: multi-system simulated signal verification, extreme satellite reception condition verification, and independent BeiDou signal verification. The model uses the 1PPS deviation statistics obtained from the terminal display panel's status flags and existing external interface output data to jointly determine the timing signal source used by the time synchronization device under test. This achieves accurate determination of the terminal's timing mode without damaging the terminal's external form.

[0078] This invention proposes a field time synchronization accuracy verification method based on multi-dimensional data analysis and statistical judgment. By real-time monitoring of the multi-dimensional time synchronization results of the tested terminal, a comprehensive evaluation index for time synchronization accuracy is designed, taking into account multiple factors such as 1PPS accuracy, IRIG-B accuracy, serial port time message accuracy, and fault alarm level. Furthermore, through the design of a service importance weighting factor, a comprehensive verification method for the reliability and accuracy of field application time synchronization terminals is achieved. In addition, addressing typical design flaws of terminal manufacturers, a field verification method for week count anomalies is designed. Through simulated enumeration tests of potential anomaly flip-over time points, potential hidden dangers in field equipment can be quickly identified, preventing serious problems such as errors in power system fault records.

[0079] Figure 3 This is a flowchart of a method for verifying the signal source and service quality of a power grid BeiDou spatiotemporal service according to an embodiment of the present invention.

[0080] like Figure 3 As shown, this invention provides a method for verifying the signal source and service quality of a power grid BeiDou spatiotemporal service based on the above-described method. The method includes: Step 301: Output an RF analog signal to the active power divider through the first output terminal of the portable satellite simulator, and output a reference frequency and 1PPS time signal to the reference time base synchronization module through the second output terminal; Step 302: Input the radio frequency analog signal to the time synchronization device under test through the two output ports of the active power divider; Step 303: The received reference frequency and 1PPS time signal are phase-locked and stabilized by the reference time base synchronization module to generate a standard time signal, and the standard time reference signal is output to the signal monitoring module. Step 304: The radio frequency analog signal is converted into a 1PPS time signal and a time synchronization output signal through the time synchronization device under test. The 1PPS time signal is output to the signal monitoring module, and the time synchronization output signal is output to the power time synchronization output adapter module. Step 305: Process the time synchronization output signal through the power time synchronization output adapter module and output the standard time synchronization signal to the signal monitoring module; Step 306: The received standard time reference signal, 1PPS time signal and standard time synchronization signal are output to the data analysis module through the signal monitoring module; Step 307: The data analysis module constructs a standardized test environment for multiple scenarios based on the satellite timing signal collaborative broadcasting algorithm under field environmental constraints. Relying on a three-level timing signal source verification model based on reliable signal tracking and verification, and using the standard time reference signal as a reference, it analyzes and determines the signal source acquisition type for 1PPS time signals and standard timing signals respectively. Through a field timing accuracy verification method based on multi-dimensional data analysis and statistical judgment, it performs accuracy calculations on three timing dimensions: 1PPS time signals, IRIG-B timing signals, and serial port time message signals. It combines the comprehensive deviation of each timing dimension and the number of equipment alarms for weighted fusion to obtain a comprehensive timing performance evaluation index, and completes the quantitative judgment of signal source service quality. Through a week count verification method based on a portable satellite simulator, it performs a special verification of the week count calculation defects of the tested power time synchronization device, realizing a comprehensive verification and judgment of signal source acquisition type, service quality, and equipment calculation performance.

[0081] The present invention provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of a method for verifying the signal source and service quality of a BeiDou spatiotemporal service for power grids.

[0082] This invention provides an electronic device, comprising: The aforementioned computer-readable storage medium; and One or more processors for executing programs in a computer-readable storage medium.

[0083] The present invention has been described with reference to a few embodiments. However, it will be apparent to those skilled in the art that other embodiments besides those disclosed above fall equivalently within the scope of the present invention.

[0084] Generally, all terms used in this invention are interpreted according to their ordinary meaning in the art, unless otherwise expressly defined herein. All references to “a / the / the [device, component, etc.]” ​​are openly interpreted as at least one instance of said device, component, etc., unless otherwise expressly stated. The steps of any method disclosed herein need not be performed in the exact order disclosed unless explicitly stated otherwise.

[0085] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0086] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0087] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0088] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0089] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the protection scope of the present invention.

Claims

1. A system for verifying the signal source and service quality of BeiDou spatiotemporal services for power grids, characterized in that, The system includes: a portable satellite simulator, an active power divider, a reference time base synchronization module, a power time synchronization device under test, a power time output adapter module, a signal monitoring module, and a data analysis module. The portable satellite simulator outputs a radio frequency analog signal to an active power divider at its first output terminal and a reference frequency and a 1PPS time signal to a reference time base synchronization module at its second output terminal. The active power divider inputs radio frequency analog signals to the time synchronization device under test through two output ports; The reference time base synchronization module performs phase-locked frequency stabilization processing on the received reference frequency and 1PPS time signal to generate a standard time signal, and outputs the standard time base signal to the signal monitoring module. The time synchronization device under test converts the radio frequency analog signal into a 1PPS time signal and a time synchronization output signal, outputs the 1PPS time signal to the signal monitoring module, and outputs the time synchronization output signal to the power time synchronization output adapter module. The power timing output adapter module processes the timing output signal and outputs a standard timing signal to the signal monitoring module; The signal monitoring module outputs the received standard time reference signal, 1PPS time signal and standard time synchronization signal to the data analysis module; The data analysis module constructs a standardized multi-scenario test environment based on a satellite timing signal collaborative broadcasting algorithm constrained by the field environment. Relying on a three-level timing signal source verification model based on reliable signal tracking and verification, and using the standard time reference signal as a reference, it determines the signal source acquisition type of the 1PPS time signal and the standard timing signal. Through a field timing accuracy verification method based on multi-dimensional data analysis and statistical judgment, it performs accuracy calculations on the three timing dimensions: the 1PPS time signal, the IRIG-B timing signal, and the serial port time message signal. It then combines the comprehensive deviation of each timing dimension with the number of equipment alarms for weighted fusion to obtain a comprehensive timing performance evaluation index, and performs quantitative judgment on the signal source service quality. Finally, through a week count verification method based on a portable satellite simulator, it verifies the week count calculation defects of the tested power time synchronization device, achieving comprehensive verification and judgment of signal source acquisition type, service quality, and equipment calculation performance.

2. The system according to claim 1, characterized in that, The active power divider, in conjunction with the portable satellite simulator, executes a satellite timing signal co-broadcasting algorithm under field environmental constraints. It performs synchronous calibration and fidelity processing on the two equally divided radio frequency analog signals, ensuring that the power of the two output radio frequency analog signals is consistent and the time synchronization error meets the power timing verification accuracy requirements, thus adapting to the dual-channel signal access verification mechanism of the power time synchronization device under test. The portable satellite simulator is equipped with multiple output modes for radio frequency analog signals, including: non-BeiDou multi-system signal output mode, multi-system BeiDou extreme satellite reception hybrid output mode, and independent BeiDou system signal output mode.

3. The system according to claim 2, characterized in that, The portable satellite simulator outputs the radio frequency analog signal based on the constraints of the on-site environment, including: The initial set of visible satellites is obtained based on the preset minimum visible elevation angle: in, The lowest visible altitude angle, For the test time, For the first The elevation angle of the satellite relative to the test point; Introducing field constraint factors: in, For occlusion state factors, Signal strength factor As a multi-path influencing factor, Noise impact factor, These are the weighting coefficients; The final set of broadcast satellites was determined based on on-site constraint factors: in, The number of satellites to be broadcast to the target; The portable satellite simulator constructs standardized test scenarios for normal time synchronization, weak signal time synchronization, extreme satellite reception time synchronization, and independent BeiDou time synchronization based on the final broadcast satellite set.

4. The system according to claim 2, characterized in that, The data analysis module, using a three-level time signal source verification model and with the standard time reference signal as a reference, determines the signal source acquisition type of the 1PPS time signal and the standard time signal, including: The portable satellite simulator is controlled to output mode as non-BeiDou multi-system signal output mode. The time deviation sequence between the 1PPS time signal of the device under test and the standard time synchronization signal within a preset acquisition period is obtained. Based on the time deviation sequence and the decision threshold, it is determined whether the time synchronization is successful in non-BeiDou multi-system signal output mode. When the first judgment result is that the time synchronization is successful, the signal source acquisition type detection process ends. When the first judgment result is that time synchronization is unsuccessful, the output mode of the portable satellite simulator is controlled to be the multi-system BeiDou extreme satellite reception hybrid output mode. The time deviation sequence between the 1PPS time signal of the device under test and the standard time synchronization signal within the preset acquisition period is obtained. Based on the time deviation sequence and the decision threshold, it is determined whether the time synchronization is successful in the multi-system BeiDou extreme satellite reception hybrid output mode. When the second judgment result is that the time synchronization is successful, the signal source acquisition type detection process ends. When the second judgment result is that time synchronization is unsuccessful, the output mode of the portable satellite simulator is controlled to be the independent Beidou system signal output mode. The time deviation sequence between the 1PPS time signal of the device under test and the standard time synchronization signal within the preset acquisition period is obtained. Based on the time deviation sequence and the decision threshold, it is determined whether the time synchronization is successful in the independent Beidou system signal output mode. When the obtained third judgment result is that the time synchronization is successful, the signal source acquisition type detection process ends. If the third judgment result indicates that time synchronization is unsuccessful, the judgment on the signal source acquisition type will be re-executed.

5. The system according to claim 4, characterized in that, The on-site time synchronization accuracy verification method based on multi-dimensional data analysis and statistical judgment performs accuracy calculations on three time synchronization dimensions: 1PPS time signal, IRIG-B time synchronization signal, and serial port time message signal. It then combines the comprehensive deviation of each time synchronization dimension with the number of device alarms for weighted fusion to obtain a comprehensive time synchronization performance evaluation index, and performs quantitative judgment of signal source service quality, including: The data analysis module uses the standard time reference signal as a reference to perform accuracy calculations on the three types of time synchronization dimensions. The three types of time synchronization dimensions include: the 1PPS time signal output by the time synchronization device under test, the IRIG-B time synchronization signal corresponding to the standard time synchronization signal output by the power time synchronization output adapter module, and the serial port time message signal. Based on accuracy calculation, the maximum absolute deviation, average deviation, and root mean square jitter of each time synchronization dimension are obtained, and a risk coefficient is introduced to construct the comprehensive time synchronization deviation of each dimension, so as to realize the quantitative verification of multi-dimensional time synchronization accuracy.

6. The system according to claim 5, characterized in that, The comprehensive deviation of each time synchronization dimension and the number of equipment alarms are weighted and fused to obtain a comprehensive time synchronization performance evaluation index; the weight coefficient of each time synchronization dimension is differentiated by the importance of power time synchronization services. The quality of service of the signal source is determined based on the comprehensive timing performance evaluation index.

7. The system according to claim 1, characterized in that, The method for verifying week count defects in the tested power time synchronization device using a portable satellite simulator includes: The portable satellite simulator is connected to the time synchronization device under test via the active power divider. The portable satellite simulator is controlled to continuously broadcast satellite signals of the BeiDou system across all frequencies. The simulation start time is set, and the broadcast continues for a preset duration. Once the time synchronization device under test stably captures the satellite signals and outputs the time synchronization result normally, the initial stable time synchronization state calibration is performed. The operating status of the time synchronization device under test is monitored in real time, with the critical flip point of the week count in the simulation scenario as the judgment node. If the time synchronization device under test issues an alarm, it is determined that the week count of the time synchronization device under test is abnormal. If the time synchronization device under test does not issue an alarm, it is determined that the week count of the time synchronization device under test is normal.

8. The system according to claim 7, characterized in that, The data analysis module is also used to verify the week count calculation defects of the time synchronization device under test, including: The simulation time of the portable satellite simulator is switched sequentially to verify the week count defect of the time synchronization device under test.

9. A method for verifying the quality of service (QoS) of a signal source based on the system described in claim 1, characterized in that, The method includes: The portable satellite simulator outputs an RF analog signal to an active power divider through its first output terminal, and outputs a reference frequency and a 1PPS time signal to a reference time base synchronization module through its second output terminal. The radio frequency analog signal is input to the time synchronization device under test through the two output ports of the active power divider; The received reference frequency and 1PPS time signal are phase-locked and stabilized by the reference time base synchronization module to generate a standard time signal, and the standard time base signal is output to the signal monitoring module. The measured time synchronization device converts the radio frequency analog signal into a 1PPS time signal and a time synchronization output signal, outputs the 1PPS time signal to the signal monitoring module, and outputs the time synchronization output signal to the power time synchronization output adapter module. The power timing output adapter module processes the timing output signal and outputs a standard timing signal to the signal monitoring module. The received standard time reference signal, 1PPS time signal, and standard time synchronization signal are output to the data analysis module through the signal monitoring module. The data analysis module constructs a standardized test environment for multiple scenarios based on the satellite timing signal collaborative broadcasting algorithm under field environmental constraints. Relying on a three-level timing signal source verification model based on reliable signal tracking and verification, and using the standard time reference signal as a reference, it analyzes and determines the signal source acquisition type of the 1PPS time signal and the standard timing signal. Through a field timing accuracy verification method based on multi-dimensional data analysis and statistical judgment, it performs accuracy calculations on the three timing dimensions: the 1PPS time signal, the IRIG-B timing signal, and the serial port time message signal. It then combines the comprehensive deviation of each timing dimension with the number of equipment alarms for weighted fusion to obtain a comprehensive timing performance evaluation index, completing the quantitative judgment of signal source service quality. Finally, through a week count verification method based on a portable satellite simulator, it specifically verifies the week count calculation defects of the tested power time synchronization device, achieving comprehensive verification and judgment of signal source acquisition type, service quality, and equipment calculation performance.

10. A computer-readable storage medium having a computer program stored thereon that, when executed by a processor, implements the steps of the method as described in claim 9.

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