Beidou remote time service device and method fusing multiple types of enhancement information

Abstract

The invention belongs to the technical field of satellite navigation, and discloses a Beidou remote time service device and method fusing multiple types of enhancement information. The time service architecture based on the national standard time signal is established, the problem that different devices can only fuse one kind of enhancement information is solved by fusing multiple types of enhancement information, and the universality and reliability of the time service device are improved. According to the invention, the comparison between the user time source and the national standard time is realized, and the real-time control of the time frequency source in the equipment can be realized. Besides, a Beidou time service unified mathematical model fusing various types of enhancement information is also constructed, the influence of distance measurement errors is considered in a Beidou PPP-B2b mode, and meanwhile, comprehensive time reference correction information is acquired by utilizing coordinate parameters of a reference station, so that difference weakening with observation information of a user station is facilitated, and the accuracy of time service is improved. The method is superior to a mode of only carrying out differencing on clock information in traditional time transmission, and is beneficial for further improving the time service precision.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of satellite navigation and relates to a Beidou remote time service device and method fusing multiple types of enhanced information. BACKGROUND

[0002] In the face of the urgent demand of distributed cluster time users for high-precision national standard time information, the traditional solution is to install a Beidou common view receiver at a single cluster and a central station respectively, and to realize comparison with the national standard time by using a pseudo-range common view time transfer method. However, the precision of the traditional time transfer will be unevenly attenuated with the increase of the distance between the single cluster and the central station, thereby causing a certain systematic deviation of the time information between different clusters.

[0003] At the same time, the traditional Beidou common view time transfer method can only realize a 16-minute time service frequency, and the time users often need to be equipped with high-precision cesium atomic clocks and hydrogen atomic clocks for compensation within 16 minutes, further increasing the cost of the time users. Therefore, how to use the Beidou technical means to realize high-precision and low-cost time service and place the time information of the distributed cluster under the national standard time system with high precision is a technical problem to be solved in the current Beidou time service field. SUMMARY

[0004] The purpose of the application is to provide a Beidou remote time service device fusing multiple types of enhanced information, which establishes a time service architecture based on a national standard time signal and fuses multiple types of enhanced information, so as to solve the problem that different site time service devices can only fuse one type of enhanced information, improve the universality of the time service device, and improve the precision.

[0005] In order to achieve the above purpose, the application adopts the following technical scheme: A Beidou remote time service device fusing multiple types of enhanced information comprises a communication unit, a Beidou tracking board unit, a rubidium clock module unit and a core data processing unit. The communication unit is used for receiving reference station Beidou real-time observation data and BDS real-time satellite orbit and clock error product streams broadcast by an analysis center, and transmitting them to the core data processing unit; the reference station is externally connected with a national standard time frequency source; The Beidou tracking board unit is used for receiving local Beidou observation data and inputting them into the core data processing unit; wherein the Beidou tracking board unit comprises a Beidou OEM board card; The rubidium clock module unit is used for providing time frequency input and external 1PPS second and 10MHz signal output for the Beidou tracking board unit, and comprises a rubidium clock control module, a rubidium clock module, a time frequency source selector, an amplifier and a clock distributor; The time frequency source selector controls whether the OEM board accesses the 10MHz signal of the rubidium clock module or not; The core data processing unit is used for sending a command request to the Beidou tracking board unit through external user setting information; Meanwhile, the core data processing unit obtains the clock difference amount by using the obtained reference station Beidou real-time observation data and combining the BDS real-time satellite orbit and clock difference data broadcast by the analysis center or the BDS PPP-B2b real-time information correction information; The obtained clock difference amount is accumulated to a fixed length time window size, the length of the time window is fixed, the Kalman filter is used to smooth and one-step predict the prediction amount of the clock difference amount, and the time window is moved by one step; the step is consistent with the time interval of the adjacent two obtained clock difference amounts; The prediction amount of the clock difference amount is input into the rubidium clock driving module to drive the rubidium clock module, the rubidium clock module outputs the 10MHz frequency and 1PPS second pulse signal after driving, and finally realizes the synchronization of the output signal and the national standard time signal.

[0006] In addition, on the basis of the above-mentioned Beidou remote time service equipment fusing multiple types of enhanced information, the application further proposes a Beidou remote time service method fusing multiple types of enhanced information based on the above-mentioned equipment, which adopts the following technical scheme: A Beidou remote time service method fusing multiple types of enhanced information comprises the following steps: Step 1. Based on the time frequency source selector, whether to collect local Beidou observation data based on the rubidium clock module is selected; Step 2. The type of enhanced information source is set; if the type of enhanced information source is set to 0, it is the BDS satellite real-time orbit and clock difference information broadcast by the analysis center; if the type of enhanced information source is set to 1, it is the BDS PPP-B2b real-time correction information; Step 3. The communication unit is used for receiving the reference station Beidou real-time observation data and the BDS real-time satellite orbit and clock difference product stream, and transmitting to the core data processing unit; the reference station is externally connected to the national standard time frequency source; Step 4. In the core data processing unit, based on the received local Beidou observation data and the reference station Beidou real-time observation data obtained by the communication unit, a GNSS carrier phase time transfer model considering the ranging error correction is given; Step 5. The reference station Beidou real-time observation data is used, and the three-dimensional coordinates of the location are combined to subtract the station-star geometric distance and modeling error in the observation equation of the reference station, to obtain a comprehensive time reference correction information formula at the reference station; Step 6. The time reference information at the reference station is used in combination with the user station observation data to directly give a function model of the Beidou remote timing considering the fusion of multiple types of enhanced information of the reference station information; Based on the comprehensive time reference correction information formula at the reference station obtained in step 5 and the function model of the Beidou remote timing considering the fusion of multiple types of enhanced information of the reference station information given in step 6, the clock difference between the local clock of the user station and the national standard time of the national timing center is directly obtained by calculation using the least square principle and method; Step 7. The obtained clock difference is accumulated to a fixed length time window size, the length of the time window is fixed, the predicted amount of the clock difference is obtained by smoothing and one-step prediction using the Kalman filter, and the time window is moved by one step; the step is consistent with the time interval of the adjacent two obtained clock differences; The predicted amount of the clock difference is input into the 10MHz rubidium clock driving module to drive the rubidium clock module, and the rubidium clock module outputs 10MHz frequency and 1PPS second pulse signal after driving, so as to realize the synchronization of the output signal and the national standard time signal.

[0007] The present application has the following advantages: 1. The present application proposes a Beidou remote timing device based on the fusion of multiple enhanced information of the Beidou satellite navigation system, which can not only realize high-precision timing based on the real-time BDS satellite orbit and clock difference information broadcast by the analysis center obtained through the Internet (by wired or wireless means), but also realize high-precision timing in the public network-free scene based on the transmission of reference station Beidou real-time observation data information and the combination of BDS PPP-B2b enhanced information. The timing device of the present application completes the integrated device architecture of the Beidou carrier phase timing method of fusing multiple enhanced information, effectively solves the problem that only one type of enhanced information can be processed between different timing devices located in two places, and helps to improve the universality and reliability of the timing device.

[0008] 2. The Beidou remote timing device of the present application not only can realize the comparison of the user time source and the national standard time, but also can realize the real-time driving of the internal time frequency source of the device, and realize the remote reproduction of the national standard time at the sub-nanosecond level. The Beidou remote timing device of the present application establishes a timing architecture based on the national standard time UTC (NTSC) time signal, can realize the timing frequency of up to 1 second, realizes the lowest cost and most convenient tracing of the user time signal to the national standard time, and is easy to trace the time reference of the user time device into the national time system and facilitate the information interaction with other national time devices.

[0009] 3. The proposed Beidou remote timing method that integrates multiple types of augmentation information constructs a unified Beidou timing mathematical model that integrates multiple types of augmentation information. Furthermore, in the Beidou PPP-B2b mode, the impact of ranging errors is taken into account and the unified Beidou timing mathematical model is further improved, thereby enhancing the timing accuracy in the Beidou PPP-B2b mode.

[0010] 4. The BeiDou remote timing method proposed in this invention, which integrates multiple types of augmentation information, fully utilizes the coordinate parameters of the reference station to obtain comprehensive time reference correction information. This information not only includes the reference station's time and frequency information, but also includes residual information from the BeiDou observation data error correction of the reference station. This facilitates the subtraction and weakening of the user station's observation information. This method is significantly superior to the traditional time transfer method that only subtracts clock information, and helps to further improve timing accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a structural block diagram of a Beidou remote timing device that integrates multiple types of enhanced information in an embodiment of the present invention; Figure 2 for Figure 1 Schematic diagram of BeiDou remote timing equipment integrating multiple types of enhanced information; Figure 3 for Figure 1 Schematic diagram of the front panel of the Beidou remote timing device integrating multiple types of enhanced information; Figure 4 for Figure 1 Schematic diagram of the rear panel of the BeiDou remote timing device integrating multiple types of enhanced information; Figure 5 for Figure 1 Schematic diagram of the front panel status of the Beidou remote timing device that integrates multiple types of enhanced information after normal operation; Figure 5 (a) is the device operating state 1, (b) is the device operating state 2, and (c) is the device operating state 3. DETAILED DESCRIPTION

[0012] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments: The present application is aimed at the urgent demand of high-precision time users for unified time signals, and the traditional time service method based on BDS pseudo-range common view and its terminal system has the problems of precision decay with the increase of time transfer link distance, inconsistency of time information obtained by different users, low-precision observation of BDS pseudo-range, and high equipment cost, which seriously restricts the application of time users. A Beidou remote time service device and method fusing multiple types of enhanced information are proposed. By comprehensively using the BDS satellite real-time orbit and clock error information provided by the IGS analysis center and the BDS PPP-B2b real-time correction information, and combining the built high-precision time service device based on the Beidou satellite navigation system (the high-precision time service device includes a communication unit, a rubidium clock module unit, a Beidou tracking board unit, a core data processing unit, and a data storage unit, etc.), the time information of the national standard time UTC (NTSC) is finally obtained. The time service method has the characteristics of advanced algorithm, good continuous operation stability, easy operation, etc., realizes the acquisition of high-precision information of users, and the method is simple to implement.

[0013] Embodiment 1 As shown in Figure 1 and Figure 2 , the Beidou remote time service device fusing multiple types of enhanced information in the embodiment includes a communication unit, a rubidium clock module unit, a Beidou tracking board unit, a core data processing unit, and a data storage unit.

[0014] The communication unit is used for receiving reference station Beidou real-time observation data and BDS real-time satellite orbit and clock error product stream (i.e. RTCM format data stream of BDS satellite real-time orbit and clock error information broadcast by the analysis center), and transmitting to the core data processing unit.

[0015] In the embodiment, the communication unit can transmit data by using wired network or wireless network such as 4G / 5G module. The wired network is used for realizing wired transmission of data, and the 4G / 5G module is used for realizing wireless transmission of data.

[0016] The communication unit receives reference station Beidou real-time observation data in real time based on the NTRIP data communication protocol, and the reference station is connected with a national standard time frequency source; at the same time, the reference station pushes to the core data processing unit in real time according to the format of RTCM3.0 data stream.

[0017] The rubidium clock module unit is used for providing time frequency input and external 1PPS second and 10MHz signal output for the Beidou tracking board unit, and includes a rubidium clock control module, a rubidium clock module, a time frequency source selector, an amplifier, and a clock distributor.

[0018] The rubidium clock driving module is used to drive the rubidium clock module according to the predicted amount of the input clock difference amount, and the driven rubidium clock module outputs a 10MHz frequency and a 1PPS second pulse signal, and finally realizes the synchronization of the output signal with the national standard time signal.

[0019] The rubidium clock module is mainly used to provide a high-stable original time frequency.

[0020] The time frequency source selector is used to monitor the state of the rubidium clock module and other external time frequency sources.

[0021] If the external time frequency source is valid, the selector automatically and seamlessly switches to the external time frequency source; if the external time frequency source is invalid, the selector switches to the time frequency source of the internal rubidium clock module.

[0022] The amplifier is used to receive the signal from the selector, amplify it to a suitable level, provide buffer isolation, and perform filtering and level conversion to ensure that the signal has sufficient driving capability and quality.

[0023] The clock distributor is mainly used to receive the signal from the amplifier, accurately copy and distribute it to a large number of output ports, and send the synchronous clock signal to various devices that need to be synchronized with extremely low skew.

[0024] The Beidou tracking board unit is used to receive local Beidou observation data and input it into the core data processing unit.

[0025] The Beidou tracking board unit includes a Beidou OEM board card and a BDS antenna interface, and the rubidium clock module controls the OEM board unit to access or not access the 10MHz signal of the rubidium clock module through the time frequency source selector.

[0026] If the time frequency source selector detects an external 10MHz time frequency reference signal input, the OEM board card of the Beidou tracking board unit performs local Beidou observation data acquisition based on the external 10MHz time frequency reference signal, and if no external 10MHz time frequency reference signal input is detected, the OEM board card performs local Beidou observation data acquisition based on the rubidium clock module.

[0027] The core data processing unit is used to send command requests to the Beidou tracking board unit through external user setting information to control the Beidou tracking board unit to receive local Beidou observation data.

[0028] Meanwhile, the core data processing unit can also obtain reference station Beidou real-time observation data, and combine the broadcasted BDS real-time satellite orbit and clock difference data or BDS PPP-B2b real-time information correction information from the analysis center to obtain the clock difference amount.

[0029] The obtained clock difference amount is accumulated to a fixed length time window size, the length of the time window is fixed, the Kalman filter is used for smoothing and one step prediction, and the time window is moved by one step.

[0030] The step is consistent with the time interval of the adjacent two obtained clock difference amounts.

[0031] The predicted amount of the clock difference amount is input into the rubidium clock control module, the rubidium clock module is controlled, the rubidium clock module outputs 10MHz frequency and 1PPS second pulse signal after control, and finally the output signal is synchronized with the national standard time signal.

[0032] The rubidium clock control module in the embodiment, for example, adopts phase microjump meter.

[0033] In addition, the core data processing unit can also store the state information and the original observation data of the user station to the data storage module. The data storage unit is used to realize the storage of the original data of the reference station and the user station and the storage of the clock difference information.

[0034] The front panel of the Beidou remote timing device is used to set the enhanced information source type; if the enhanced information source is set as RTS identifier, the BDS satellite real-time orbit and clock difference information broadcast by the analysis center is analyzed, and the information source type is 0.

[0035] If the enhanced information source is set as PPP-B2b identifier, it is BDS PPP-B2b real-time correction information, and the information source type is 1.

[0036] The purpose of setting different enhanced information source types here is to realize remote timing when the BDS real-time satellite orbit and clock difference information provided by the analysis center is unavailable, so as to enhance the timing accuracy and reliability in multiple scenarios.

[0037] According to the setting of the enhanced information source of the local timing device, the same time transfer model as the local timing device is selected on the timing device at different sites at the same time, so as to eliminate the systematic error caused by selecting different data models at different sites.

[0038] In addition, the Beidou remote timing device in the embodiment also includes a data interface unit, a power management module unit and the like.

[0039] The data interface unit mainly includes RS232 serial port, HDMI, USB interface, which are respectively used to realize the connection with the computer, the display of the data processing process of the data processing module and the import of external data and the like.

[0040] The RS232 serial port is connected with the computer to realize the setting and adjustment of the internal program of the device.

[0041] Power management module unit, mainly for external 220V voltage conversion, power supply for other modules, etc.

[0042] As Figure 3 The components of the front panel of the Beidou remote time service device in this embodiment are shown, wherein: I.1. The leftmost button of the front panel is the receiver switch.

[0043] When the device is in the shutdown state, the indicator light to the right thereof is not lit, and when the device is in the startup state, the indicator light is long-lit red.

[0044] I.2. The ESC button is the exit button when setting the enhanced information source.

[0045] I.3. The indicator lights are a total of 6, and from left to right, they are: Satellite search state display, green constant for normal satellite locking, red flashing for satellite not locked; Positioning state display, green constant for completed positioning, red flashing for incomplete positioning; 4G / 5G communication signal quality, green constant for normal signal, red flashing for abnormal signal; SYN green long light, red flashing respectively represent completed, not realized and the synchronization of national standard time signal; PPS-IN green long light represents that the device accesses external second pulse signal, and gray not light represents that the internal rubidium clock pulse signal is used; REF-IN green long light represents that the device accesses external frequency signal, and gray not light represents that the internal rubidium clock frequency signal is used.

[0046] I.4. The liquid crystal display is used for displaying information during setting and related state information of positioning and time synchronization accuracy.

[0047] I.5. The function selection button is displayed on the liquid crystal screen, and is used for setting the type of enhanced information source through the same.

[0048] As Figure 4 The components of the front panel of the Beidou remote time service device in this embodiment are shown, wherein: II.1. The BNC connector corresponding to GNSS1 is responsible for connecting the external antenna of GNSS.

[0049] II.2. The TNC connector corresponding to REFI is responsible for connecting the external 10HMz frequency signal.

[0050] II.3. The TNC connector corresponding to REFO is responsible for outputting the 10HMz frequency signal of the internal time frequency source after steering.

[0051] II.4. 4G corresponding TNC joint, responsible for connecting the antenna of 4G signal.

[0052] II.5. PPS-IN corresponding TNC joint, responsible for the access of external 1PPS pulse signal.

[0053] II.6. PPS-OUT corresponding TNC joint, responsible for the output of internal controlled time frequency source 1PPS pulse signal.

[0054] II.7. COM1 and COM2 are COM ports displayed by the device, which are male and female respectively.

[0055] II.8. ETH is a network connection port.

[0056] II.9. USBC and USB1, USB2 are interfaces for the interaction of data, programs, scripts and other files inside and outside the time service device.

[0057] II.10. SIM card is a communication card slot.

[0058] II.11. HDMI is a display interface.

[0059] II.12. 24V interface is a power supply port of the time service device, which is powered through the adapter provided by the device.

[0060] The specific operation process of the Beidou remote time service device integrating multiple types of enhanced information in the embodiment is as follows: 1. In the rear panel GNSS1 interface of the time service device of the application, the Beidou external antenna is connected, the communication antenna is connected at the 4G interface, the SIM card is inserted into the SIM card slot, and the adapter is connected at the rear panel power supply.

[0061] In the case of no external time frequency standard, no external time frequency standard needs to be connected, in the case of external time frequency standard, 10MHz time frequency is connected at REFI, and external 1PPS second pulse is connected at PPS-IN.

[0062] 2. At the power button of the front panel of the authorized device, the device button is started. After normal start, the display panel displays the word "Normal", and the right selection button is used to configure the enhanced information source. After selection, the "OK" key is pressed to confirm.

[0063] If the BDS satellite real-time orbit and clock error information broadcast in real time by the analysis center is used, the enhanced information source is 0, and the ranging error S is zero; if the BDS PPP-B2b correction number information source is used, the enhanced information source is 1, and the ranging error S is not zero.

[0064] The application can realize free switching of user equipment in two enhanced information scenarios, and enhances the universality of the equipment. In addition, the ranging error of the Beidou PPP-B2b mode is also considered, and the timing accuracy in this scenario is improved.

[0065] 3. The front panel of the Beidou remote timing equipment fusing multiple types of enhanced information starts to automatically appear satellite search, normal positioning, time transfer, and time and frequency control, etc. After normal operation, (a) (b) and (c) in the following table are displayed in a rolling manner, and the interval time is 5 seconds. Figure 5 (a) (b) and (c) in the following table are respectively the equipment running states one, two and three. Figure 5 (a) (b) and (c) in the following table are respectively the equipment running states one, two and three.

[0066] The equipment running state one indicates that the solving mode is the Beidou timing model (PPP) fusing multiple types of enhanced information, and the GNSS system is BDS (BDS). The equipment running state two indicates the position (longitude (Lon) and latitude (Lat)) of the equipment. The equipment running state three indicates the elevation (Height) and receiver clock offset (Clkoff) of the equipment, and the units are meters and nanoseconds respectively.

[0067] Embodiment 2 The embodiment 2 discloses a Beidou remote timing method fusing multiple types of enhanced information, which is based on the Beidou remote timing equipment fusing multiple types of enhanced information in the above embodiment 1.

[0068] Specifically, the Beidou remote timing method fusing multiple types of enhanced information in the embodiment includes the following steps: Step 1. Based on the time and frequency source selector, whether to collect local Beidou observation data based on the rubidium clock module is selected.

[0069] If the time and frequency source selector detects that there is an external 10MHz time and frequency reference signal input, the OEM board card of the Beidou tracking board unit collects local Beidou observation data based on the external 10MHz time and frequency reference signal, and if no external 10MHz time and frequency reference signal input is detected, local Beidou observation data is collected based on the rubidium clock module.

[0070] Step 2. Set the enhanced information source type; if the enhanced information source type is set to 0, it is the real-time orbit and clock error information of the BDS satellite broadcast by the analysis center; if the enhanced information source type is set to 1, it is the BDS PPP-B2b real-time correction information.

[0071] Step 3. The communication unit, for example, based on the 4G / 5G module, receives the reference station Beidou real-time observation data and the BDS real-time satellite orbit and clock error product stream, and transmits them to the core data processing unit; the reference station is externally connected with the national standard time and frequency source.

[0072] Step 4. In the core data processing unit, the local BeiDou observation data received by the BeiDou tracking module unit and the BeiDou real-time observation data of the base station obtained by the 4G / 5G module undergo multi-threaded data processing, and a GNSS carrier phase time transfer model that takes into account the ranging error correction and the calculation formula of the ranging error are given, as shown in formula (1): (1) In the formula Pseudorange observations, represents the carrier phase observation, is the epoch identifier, For GNSS satellites With receiver The distance between is the receiver clock error, is the satellite clock error, is the speed of light, is the tropospheric delay, is the carrier phase ambiguity, is the pseudorange noise, is the carrier phase noise, is the ranging error equivalent to the corresponding orbit and clock error.

[0073] If the enhanced information source is set to 0, the real-time orbit and clock information of the BDS satellite broadcast by the analysis center, the ranging error If the enhanced information source is set to 1, it is BDS PPP-B2b real-time correction information, and the ranging error for .

[0074] The ranging error is The specific calculation method is as follows: ; T is the satellite clock deviation, R is the radial orbit deviation, A is the tangential orbit deviation, and C is the normal orbit deviation. The specific values ​​of each parameter can be found in Table 1.

[0075] Table 1 Specific values ​​of various parameters

[0076] in, and is a constant coefficient, In GEO / IGSO and MEO constellations, the values ​​are 0.99 and 0.98 respectively. In GEO / IGSO and MEO constellations the values ​​are 127 and 54 respectively.

[0077] Step 5. The reference station UTC (NTSC) Beidou real-time observation data obtained by the communication unit is combined with the three-dimensional coordinates of its location, and the station star geometric distance and modeling error are subtracted in the observation equation of the reference station to obtain the comprehensive time reference correction information formula at the reference station, as shown in formula (2): (2) Wherein represents the pseudo-range residual of the reference station, represents the pseudo-range observation of the reference station, represents the satellite-ground distance of the reference station, represents the phase residual of the reference station, represents the phase observation of the reference station.

[0078] Step 6. The time reference information at the reference station is combined with the user station observation data to directly give the function model of Beidou remote timing considering the fusion of multi-type enhanced information of the reference station information, as shown in formula (3): (3) In the formula represents the receiver clock error parameter of the reference station, is the relative ranging error between the user station and the reference station. , is the satellite-ground distance of the user station, is the satellite-ground distance of the reference station.

[0079] Combining formula (2) and formula (3), the clock difference between the local clock of the user station and the national standard time of the national time service center is directly obtained by calculation using the least square principle and method, as shown in formula (4): (4) In the formula, is the clock difference between the local clock of the user station and the national standard time of the national time service center at the current time.

[0080] Step 7. Clock steering quantity acquisition.

[0081] The obtained clock difference is accumulated to a fixed length time window size, for example, 30 minutes, the length of the fixed time window is smoothed and one-step predicted by using Kalman filter to obtain the prediction amount of the clock difference, and the time window is moved by one step, wherein the step is consistent with the time interval of the adjacent two obtained clock differences.

[0082] The clock difference amount prediction amount (i.e. clock steering amount) is input into a 10MHz phase micro-jump meter (i.e. rubidium clock steering module), the rubidium clock module is steered, the steered rubidium clock module outputs 10MHz frequency and 1PPS second pulse signal, finally the output signal is synchronized with the national standard time signal, thus the Beidou remote time service is completed.

[0083] Of course, the above description is only for the preferred embodiments of the present application, the present application is not limited to the above-mentioned embodiments, it should be noted that any skilled person in the art can make all equivalent substitutions, obvious modifications under the teaching of the present application, which are within the scope of the present application, and should be protected by the present application.

Claims

1. A BeiDou remote timing device integrating multiple types of enhanced information, characterized in that: Including communication unit, Beidou tracking plate unit, rubidium clock module unit and core data processing unit; The communication unit is used to receive the BeiDou real-time observation data from the base station and the BDS real-time satellite orbit and clock error product stream broadcast by the analysis center, and transmit them to the core data processing unit; the base station is externally connected to the national standard time and frequency source; The BeiDou tracking unit is used to receive local BeiDou observation data and input it into the core data processing unit; The BeiDou tracking unit includes BeiDou OEM board; The rubidium clock module unit is used to provide time and frequency input and external 1PPS second and 10MHz signal output for the Beidou tracking plate unit. It includes a rubidium clock driving module, a rubidium clock module, a time and frequency source selector, an amplifier, and a clock distributor; The time frequency source selector controls whether the OEM board is connected to the 10MHz signal of the rubidium clock module; The core data processing unit is used to send command requests to the Beidou tracking plate unit through external user setting information; At the same time, the core data processing unit uses the BeiDou real-time observation data obtained from the reference station and combines it with the BDS real-time satellite orbit and clock error data or BDS PPP-B2b real-time information correction information broadcast by the analysis center to obtain the clock error. The obtained clock error is accumulated into a fixed time window. The time window is fixed in length, and the Kalman filter is used to smooth and predict the clock error in one step to obtain the predicted clock error. The time window is then moved by one step. The step length is consistent with the time interval between two consecutive clock errors. The predicted clock error is input into the rubidium clock control module, and the rubidium clock module is controlled. The controlled rubidium clock module outputs a 10MHz frequency and a 1PPS second pulse signal, ultimately achieving synchronization of the output signal with the national standard time signal.

2. The BeiDou remote timing device integrating multiple types of enhanced information according to claim 1, characterized in that: The time frequency source selector automatically configures the time frequency source type; If the time-frequency source selector detects an external 10MHz time-frequency reference signal input, the OEM board will collect local Beidou observation data based on the external 10MHz time-frequency reference signal; If no external 10MHz time and frequency reference signal input is detected, local Beidou observation data is collected based on the rubidium clock module.

3. The BeiDou remote timing device integrating multiple types of enhanced information according to claim 1, characterized in that: The front panel of the BeiDou remote timing device is used to set the enhanced information source type; if the enhanced information source is set to RTS, it is the BDS satellite real-time orbit and clock information broadcast by the analysis center, and the information source type is 0; If the enhanced information source is set to PPP-B2b, it is BDS PPP-B2b real-time correction information, and the information source type is 1.

4. The BeiDou remote timing device integrating multiple types of enhanced information according to claim 1, characterized in that: The communication unit includes a wired network or a 4G / 5G module. The communication unit receives BeiDou real-time observation data from a reference station based on the NTRIP data communication protocol. The reference station is externally connected to a national standard time and frequency source. At the same time, the communication unit pushes the RTCM3.0 data stream format to the core data processing unit in real time.

5. The Beidou remote timing device integrating multiple types of enhanced information according to claim 1, characterized in that: The BeiDou remote timing device integrating multiple types of enhanced information further includes a data storage unit; wherein the data storage unit is used to store the original BDS observation data of the reference station and the user station and the clock difference information.

6. The BeiDou remote timing device integrating multiple types of enhanced information according to claim 1, characterized in that: According to the enhanced information source type set by the local timing device, the same time transfer model as the local timing device is selected on the timing devices at different sites at the same time to eliminate the systematic errors caused by selecting different data models at different sites.

7. A BeiDou remote timing method integrating multiple types of enhanced information, based on the BeiDou remote timing device integrating multiple types of enhanced information according to any one of claims 1 to 6, characterized in that: The method comprises the following steps: Step 1. Based on the time and frequency source selector, select whether to collect local BeiDou observation data based on the rubidium clock module; Step 2. Set the Enhancement Information Source Type. If the Enhancement Information Source Type is set to 0, the BDS satellite real-time orbit and clock information broadcast by the Analysis Center will be used. If the Enhancement Information Source Type is set to 1, the BDS PPP-B2b real-time correction information will be used. Step 3. The communication unit receives the BeiDou real-time observation data and BDS real-time satellite orbit and clock error product streams from the base station and transmits them to the core data processing unit. The base station is connected to the national standard time and frequency source. Step 4. In the core data processing unit, based on the received local BeiDou observation data and the real-time BeiDou observation data from the reference station obtained by the communication unit, a GNSS carrier phase time transfer model that takes into account ranging error correction is developed. Step 5. Using the real-time BeiDou observation data from the reference station and the three-dimensional coordinates of its location, subtract the station-satellite geometric distance and modeling error from the reference station's observation equation to obtain the comprehensive time base correction information formula at the reference station. Step 6. Using the time base information of the reference station and combining it with the observation data of the user station, a BeiDou remote timing function model is directly derived that takes into account the reference station information and integrates multiple types of augmentation information. Based on the formula for the integrated time reference correction information at the reference station obtained in step 5 and the BeiDou remote timing function model that integrates multiple types of augmentation information taking into account the reference station information given in step 6, the clock difference between the local clock of the user station and the national standard time of the National Time Service Center is directly calculated using the least squares principle and method. Step 7. Utilize the obtained clock errors and accumulate them into a fixed-length time window. This fixed time window is then smoothed and one-step predicted using a Kalman filter to obtain the predicted clock error. The time window is then shifted by a step size, where the step size is consistent with the time interval between two consecutive clock error measurements. The predicted clock error is input into the 10MHz rubidium clock control module, and the rubidium clock module is controlled. The controlled rubidium clock module outputs a 10MHz frequency and 1PPS second pulse signal, realizing synchronization of the output signal with the national standard time signal.

8. The BeiDou remote timing method integrating multiple types of enhanced information according to claim 7, characterized in that: In step 4, the GNSS carrier phase time transfer model taking into account the ranging error correction is shown in formula (1): （1） In the formula represents the pseudorange observation, represents the carrier phase observation, is the epoch identifier, For GNSS satellites With receiver The distance between is the receiver clock error, is the satellite clock error, is the speed of light, is the tropospheric delay, is the carrier phase ambiguity, is the pseudorange noise, is the carrier phase noise, is the ranging error equivalent to the corresponding orbit and clock error; If the enhanced information source is set to 0, the real-time orbit and clock information of the BDS satellite broadcast by the analysis center, the ranging error If the enhanced information source is set to 1, it is BDS PPP-B2b real-time correction information, and the ranging error for ; The ranging error is The calculation formula is as follows; ; Where T is the satellite clock deviation, R is the radial orbit deviation, A is the tangential orbit deviation, and C is the normal orbit deviation. and is a constant coefficient.

9. The Beidou remote timing method integrating multiple types of enhanced information according to claim 8, characterized in that: In step 5, the integrated time reference correction information at the reference station is as shown in formula (2): (2) in represents the pseudorange residual of the reference station, represents the pseudo-range observation of the reference station, Indicates the satellite-to-ground distance of the base station. represents the phase residual of the reference station, Represents the phase observation of the base station.

10. The Beidou remote timing method integrating multiple types of enhanced information according to claim 9, characterized in that: In step 6, the function model of Beidou remote timing is as shown in formula (3): （3） In the formula represents the receiver clock error parameter of the reference station, is the relative ranging error between the user station and the reference station; , is the satellite-to-ground distance of the user station, is the satellite-to-ground distance of the reference station; Combining formula (2) and formula (3), using the least squares principle and method, the clock difference between the local clock of the user station and the national standard time of the national time service center can be directly obtained by calculation, as shown in formula (4): (4) Where, It is the clock difference between the local clock of the user station at the current moment and the national standard time of the national time service center.

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