Low-frequency time code time delay automatic correction timing device
By designing a low-frequency time code delay automatic correction timing device, and using a delay correction module to automatically correct the propagation delay, the problem of propagation distance affecting timing accuracy is solved, and higher precision time signal output is achieved.
Patent Information
- Application Number
- CN202423315068.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-31
- Publication Date
- 2026-01-27
- Estimated Expiration
- 2034-12-31
AI Technical Summary
In low-frequency time code synchronization technology, the propagation delay caused by the propagation distance affects the timing accuracy and cannot meet the application needs of users with higher precision time.
Design a low-frequency time code delay automatic correction timing device, including a delay correction module, comprising a clock unit, a propagation delay calculation unit, a phase difference measurement unit, a delay correction amount calculation unit, a memory, and a correction unit, which automatically corrects the propagation delay by acquiring user coordinates.
By automatically correcting the propagation delay, a standard second pulse signal closer to UTC is output, improving timing accuracy and meeting the needs of users with higher precision time.
Smart Images
Figure CN223843756U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of signal measurement technology, and in particular to a timing device for automatic correction of low-frequency time code delay. Background Technology
[0002] Low-frequency time code synchronization is a time synchronization method that uses a low-frequency amplitude-modulated carrier to transmit time information. It is a special long-wave time synchronization technology that typically operates in the low-frequency band of 30-300kHz. It can simultaneously provide standard time and frequency signals in both analog and digital modes. At the time synchronization center, an atomic clock generates a precise standard time, and then the time information is encoded. The encoded time signal is modulated onto a low-frequency carrier (such as JJY / 40kHz, BPC / 68.5kHz, etc.) and transmitted via long-wave radio. The receiving system receives the low-frequency time code signal through a ferrite rod antenna, demodulates the time code signal using an integrated chip, and then sends the signal to a processor for decoding and other processing to obtain the standard time information. This eliminates the time accumulation error of the timer and ensures that the receiving system's time is highly synchronized with the standard time.
[0003] Low-frequency time code synchronization technology has been widely applied in various fields, such as military applications, power grid synchronization, communication network synchronization, financial and securities systems, e-government and e-commerce, and the watchmaking industry. Currently, countries such as Germany, the United States, the United Kingdom, and Japan have successfully developed and widely applied low-frequency time code synchronization technology. China has also made significant progress in this field. The National Time Service Center has been tracking this technology since 1993 and has successfully launched radio-controlled clocks with independent Chinese intellectual property rights. In the future, with continuous technological development, low-frequency time code synchronization technology is expected to be applied and promoted in even more fields.
[0004] Low-frequency time code timing has the advantages of stable propagation and wide propagation range. However, the propagation delay caused by the propagation distance is the main factor affecting the timing accuracy of low-frequency time code. Therefore, in order to further improve its timing accuracy and expand its application range, it is necessary to develop a timing device with automatic low-frequency time code delay correction, a low-frequency time code timing device that can automatically correct the propagation delay by acquiring user coordinates, so as to meet the application needs of users with higher precision time. Utility Model Content
[0005] In order to overcome the problem that the propagation delay caused by the propagation distance affects the timing accuracy of low-frequency time codes, this utility model aims to provide a low-frequency time code delay automatic correction timing device that can automatically correct the propagation delay by acquiring user coordinates, so as to meet the application needs of users with higher precision time.
[0006] To address the aforementioned technical problems, this utility model provides a low-frequency time code delay automatic correction timing device, including a delay correction module. The delay correction module comprises a clock unit, a propagation delay calculation unit, a phase difference measurement unit, a delay correction amount calculation unit, a memory, and a correction unit. The output terminals of the propagation delay calculation unit, the phase difference measurement unit, and the memory are electrically connected to the input terminal of the delay correction amount calculation unit, respectively. The output terminal of the clock unit is electrically connected to the input terminals of the phase difference measurement unit and the correction unit, respectively. The output terminal of the delay correction amount calculation unit is electrically connected to the input terminal of the correction unit.
[0007] Preferably, the time delay correction module further includes a first input interface, a second input interface, and a fourth output interface. The first input interface is electrically connected to the positioning module, the second input interface is electrically connected to the low-frequency time code signal receiving module, and the fourth output interface is electrically connected to the output terminal of the correction unit.
[0008] Preferably, the positioning module includes a first receiving unit, a position calculation unit, and a first output interface. The output terminal of the first receiving unit is electrically connected to the input terminal of the position calculation unit, the output terminal of the position calculation unit is electrically connected to the first output interface, and a positioning antenna is connected to the input terminal of the first receiving unit.
[0009] Preferably, the first output interface is electrically connected to the second input interface.
[0010] Preferably, the low-frequency time code signal receiving module includes a second receiving unit, a falling edge discrimination unit, and a second output interface. The output terminal of the second receiving unit is electrically connected to the input terminal of the falling edge discrimination unit, the output terminal of the falling edge discrimination unit is connected to the second output interface, and a low-frequency time code antenna is connected to the input terminal of the second receiving unit.
[0011] Preferably, the second output interface is electrically connected to the second input interface.
[0012] Preferably, the low-frequency time code signal receiving module further includes a pulse width discrimination unit, a time code calculation unit, and a third output interface. The output terminal of the pulse width discrimination unit is electrically connected to the input terminal of the time code calculation unit, the output terminal of the time code calculation unit is electrically connected to the third output interface, and the output terminal of the falling edge discrimination unit is electrically connected to the input terminal of the pulse width discrimination unit.
[0013] Preferably, the positioning module is a GNSS positioning module, and the positioning antenna is a GNSS antenna.
[0014] Preferably, the GNSS antenna must be installed in a location that ensures an unobstructed view to the south.
[0015] Preferably, the third output interface is a time code information output interface, and the fourth output interface is a corrected second pulse signal output interface.
[0016] Beneficial effects
[0017] This invention establishes a time delay correction module comprising a clock unit, a propagation delay calculation unit, a phase difference measurement unit, a time delay correction calculation unit, a memory, and a correction unit. The outputs of the phase difference measurement unit and the memory are electrically connected to the input of the time delay correction calculation unit, the output of the clock unit is electrically connected to the inputs of the phase difference measurement unit and the correction unit, and the output of the time delay correction calculation unit is electrically connected to the input of the correction unit. This completes the automatic correction of propagation delay and finally outputs the corrected second pulse signal, making the output time signal closer to UTC (NTSC).
[0018] The installation location of the GNSS antenna of this invention must ensure an open and unobstructed view to the south in order to ensure the accuracy of the satellite signals received by the GNSS antenna, and thus ensure the accuracy of the latitude and longitude information of the user's location output by the GNSS positioning module. Attached Figure Description
[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0020] Figure 1 This is a schematic diagram of the composition structure of the low-frequency time code delay automatic correction timing device of this utility model;
[0021] Figure 2 This is a schematic diagram of the correction principle of the low-frequency time code delay automatic correction timing device of this utility model. Detailed Implementation
[0022] To further understand the present invention, the following detailed description is provided in conjunction with the accompanying drawings and specific embodiments. It should be understood that the embodiments are merely illustrative and not intended to limit the scope of the invention.
[0023] Example 1
[0024] A low-frequency time code delay automatic correction timing device, such as Figure 1As shown, it includes a time delay correction module, which includes a clock unit, a propagation delay calculation unit, a phase difference measurement unit, a time delay correction amount calculation unit, a memory, and a correction unit. The output terminals of the propagation delay calculation unit, the phase difference measurement unit, and the memory are electrically connected to the input terminal of the time delay correction amount calculation unit, respectively. The output terminal of the clock unit is electrically connected to the input terminals of the phase difference measurement unit and the correction unit, respectively. The output terminal of the time delay correction amount calculation unit is electrically connected to the input terminal of the correction unit.
[0025] For example, the memory stores the preset coordinate information and fixed delay information of the low-frequency time code broadcasting station, and the clock unit generates a local second pulse signal.
[0026] The time delay correction module further includes a first input interface, a second input interface, and a fourth output interface. The first input interface is electrically connected to the positioning module, the second input interface is electrically connected to the low-frequency time code signal receiving module, and the fourth output interface is electrically connected to the output terminal of the correction unit.
[0027] The positioning module includes a first receiving unit, a position calculation unit, and a first output interface. The output terminal of the first receiving unit is electrically connected to the input terminal of the position calculation unit, and the output terminal of the position calculation unit is electrically connected to the first output interface. A positioning antenna is connected to the input terminal of the first receiving unit.
[0028] The first output interface is electrically connected to the second input interface.
[0029] The low-frequency time code signal receiving module includes a second receiving unit, a falling edge discrimination unit, and a second output interface. The output terminal of the second receiving unit is electrically connected to the input terminal of the falling edge discrimination unit, and the output terminal of the falling edge discrimination unit is connected to the second output interface. A low-frequency time code antenna is connected to the input terminal of the second receiving unit.
[0030] The second output interface is electrically connected to the second input interface.
[0031] The low-frequency time code signal receiving module further includes a pulse width discrimination unit, a time code calculation unit, and a third output interface. The output terminal of the pulse width discrimination unit is electrically connected to the input terminal of the time code calculation unit, the output terminal of the time code calculation unit is electrically connected to the third output interface, and the output terminal of the falling edge discrimination unit is electrically connected to the input terminal of the pulse width discrimination unit.
[0032] The positioning module is a GNSS positioning module, and the positioning antenna is a GNSS antenna.
[0033] The installation location of the GNSS antenna must ensure an open and unobstructed view to the south.
[0034] The third output interface is a time code information output interface, and the fourth output interface is a corrected second pulse signal output interface.
[0035] Working principle: (e.g.) Figure 1 As shown, this device consists of three modules: a positioning module, a low-frequency time code signal receiving module, and a time delay correction module, as detailed below:
[0036] The positioning module is a GNSS positioning module, which is used to measure and output the latitude and longitude information of the user's location. The first receiving unit receives satellite signals through the GNSS antenna and performs signal processing. After processing, the location settlement unit completes the user's location settlement. Then, the latitude and longitude data information of the user's location is output from the first output interface to the first input interface of the time delay correction module, and the time delay correction module obtains the user's coordinate information.
[0037] The low-frequency time code receiving module is used to output low-frequency time code second pulse signals and time code information (year, month, day, week, hour, minute, second). The low-frequency time code timing signal is received by the second receiving unit through the low-frequency time code antenna and the signal is demodulated. The falling edge discrimination unit identifies the falling edge of the demodulated low-frequency time code pulse signal. Since the falling edge of the low-frequency time code pulse signal marks the second time in UTC (NTSC), 1PPS is output based on the identified falling edge time to obtain the low-frequency time code second pulse signal. The obtained low-frequency time code second pulse signal is output to the second input interface of the time delay correction module through the second output interface. The time delay correction module obtains the low-frequency time code second pulse signal. At the same time, based on the identification by the falling edge discrimination unit, the low-frequency time code pulse signal is subjected to low-level pulse width discrimination by the pulse width discrimination unit. Then, the time code calculation unit calculates the time code information of year, month, day, week, hour, minute, and second according to the encoding rules of low-frequency time code, and outputs the obtained time code information through the third output interface.
[0038] The delay correction module is used to automatically correct the propagation delay and output a standard second pulse signal. The memory in the delay correction module stores the preset coordinate information and fixed delay information of the low-frequency time code transmitter. Based on the user position coordinate information output by the GNSS positioning module and the preset coordinate information of the low-frequency time code transmitter, the delay correction module calculates the great circle propagation distance of the low-frequency time code timing signal through the propagation delay calculation unit, and calculates the propagation delay according to the spatial propagation delay model of the low-frequency time code timing signal. At the same time, the phase difference measurement unit measures the phase deviation between the low-frequency time code second pulse output by the low-frequency time code signal receiving module and the local second pulse generated by the built-in clock unit. Combining the fixed delay, propagation delay and phase deviation obtained after device calibration, the delay correction amount is calculated by the delay correction amount calculation unit to obtain the delay correction amount. The correction unit performs phase shifting on the local second pulse based on the obtained delay correction amount to complete the delay correction. Finally, the corrected second pulse signal is output through the fourth output interface.
[0039] like Figure 2 As shown, the signal propagation delay calculated based on the location information of the transmitter and receiver, combined with the fixed delay obtained after equipment calibration, is represented by T in the figure, which is the phase deviation between the received low-frequency time code signal 1PPS and the UTC (NTSC) 1PPS. The local 1PPS generated by the delay correction module is affected by the arbitrary power-on time, resulting in random phase characteristics, which can be classified into two categories. When the phase difference measurement is triggered by the low-frequency time code 1PPS as the start trigger and the local 1PPS as the end trigger, the two types of random phases of the local 1PPS can be represented as: Type A: T + Ta ≥ 1; Type B: T + Tb < 1. Figure 2 As indicated by the symbols in the diagram. When the local random 1PPS phase is type A, the delay correction is T+Ta-1; when the local random 1PPS phase is type B, the delay correction is T+Tb. Based on the delay correction obtained from the calculation, phase correction can be applied to the local 1PPS to obtain a more accurate standard 1PPS output.
[0040] The above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although the utility model 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 this utility model. Any modifications or equivalent substitutions that do not depart from the spirit and scope of this utility model should be covered within the protection scope of the claims of this utility model.
Claims
1. A low-frequency time code delay automatic correction timing device, characterized in that, The system includes a time delay correction module, which comprises a clock unit, a propagation delay calculation unit, a phase difference measurement unit, a time delay correction amount calculation unit, a memory, and a correction unit. The outputs of the propagation delay calculation unit, the phase difference measurement unit, and the memory are electrically connected to the input of the time delay correction amount calculation unit. The output of the clock unit is electrically connected to the inputs of the phase difference measurement unit and the correction unit. The output of the time delay correction amount calculation unit is electrically connected to the input of the correction unit.
2. The low-frequency time code delay automatic correction timing device as described in claim 1, characterized in that, The time delay correction module further includes a first input interface, a second input interface, and a fourth output interface. The first input interface is electrically connected to the positioning module, the second input interface is electrically connected to the low-frequency time code signal receiving module, and the fourth output interface is electrically connected to the output terminal of the correction unit.
3. The low-frequency time code delay automatic correction timing device as described in claim 2, characterized in that, The positioning module includes a first receiving unit, a position calculation unit, and a first output interface. The output terminal of the first receiving unit is electrically connected to the input terminal of the position calculation unit, and the output terminal of the position calculation unit is electrically connected to the first output interface. A positioning antenna is connected to the input terminal of the first receiving unit.
4. The low-frequency time code delay automatic correction timing device as described in claim 3, characterized in that, The first output interface is electrically connected to the second input interface.
5. The low-frequency time code delay automatic correction timing device as described in claim 2, characterized in that, The low-frequency time code signal receiving module includes a second receiving unit, a falling edge discrimination unit, and a second output interface. The output terminal of the second receiving unit is electrically connected to the input terminal of the falling edge discrimination unit, and the output terminal of the falling edge discrimination unit is connected to the second output interface. A low-frequency time code antenna is connected to the input terminal of the second receiving unit.
6. The low-frequency time code delay automatic correction timing device as described in claim 5, characterized in that, The second output interface is electrically connected to the second input interface.
7. The low-frequency time code delay automatic correction timing device as described in claim 5, characterized in that, The low-frequency time code signal receiving module further includes a pulse width discrimination unit, a time code calculation unit, and a third output interface. The output terminal of the pulse width discrimination unit is electrically connected to the input terminal of the time code calculation unit, the output terminal of the time code calculation unit is electrically connected to the third output interface, and the output terminal of the falling edge discrimination unit is electrically connected to the input terminal of the pulse width discrimination unit.
8. The low-frequency time code delay automatic correction timing device as described in claim 3, characterized in that, The positioning module is a GNSS positioning module, and the positioning antenna is a GNSS antenna.
9. The low-frequency time code delay automatic correction timing device as described in claim 8, characterized in that, The GNSS antenna must be installed in a location that ensures an unobstructed view to the south.
10. The low-frequency time code delay automatic correction timing device as described in claim 7, characterized in that, The third output interface is a time code information output interface, and the fourth output interface is a corrected second pulse signal output interface.