High-precision time-frequency signal transmission measurement method and system

Abstract

The invention discloses a high-precision time-frequency signal transmission and measurement system. The system comprises multiple groups of Beidou signal receiving modules, signal analysis and processing modules, time-frequency signal extraction modules, time-frequency signal verification modules and processed signal transmission modules, wherein the Beidou signal receiving modules, the signal analysis and processing modules, the time-frequency signal extraction modules, the time-frequency signal verification modules and the processed signal transmission modules are arranged; the Beidou signal receiving module receives a time service signal and a time frequency signal of a Beidou satellite, the signal analyzing and processing module enhances the quality of the received signal, and the time frequency signal extracting module extracts time information and frequency information from the enhanced Beidou signal; the time frequency signal verification module measures the extracted time information and frequency information, and the processed signal transmission module transmits the processed Beidou time information and frequency information to user equipment and comprises a programmable digital signal processor and a filter. Compared with the prior art, the high-precision time-frequency signal transmission measurement method and system provided by the invention have the advantages of being convenient to operate and use and ensuring the use precision.

Description

Technical Field

[0001] The present invention relates to the technical field of Beidou navigation satellite systems, and specifically refers to a high-precision time-frequency signal transmission measurement method and system. Background Art

[0002] With the completion of the global networking of the Beidou navigation satellite system, its applications in the fields of communication, navigation, positioning, time service, etc. are becoming increasingly widespread. However, in the process of Beidou time-frequency transfer, time measurement, and frequency measurement, many challenges are faced, such as attenuation and interference during signal transmission, as well as requirements for accuracy and stability during the measurement process.

[0003] Traditional time-frequency signal transmission measurement methods have deficiencies in terms of accuracy, stability, and anti-interference ability, and it is difficult to meet the requirements of modern high-precision applications. For example, in time measurement and frequency measurement, traditional measurement methods may have problems such as low accuracy and poor stability, and it is difficult to meet the requirements of high-precision applications in the Beidou system. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the above technical defects and provide a high-precision time-frequency signal transmission measurement method and system that is convenient to operate and use and ensures the use accuracy.

[0005] To solve the above technical problem, the technical solution provided by the present invention is: a high-precision time-frequency signal transmission measurement system, including multiple groups of Beidou signal receiving modules, signal analysis and processing modules, time-frequency signal extraction modules, time-frequency signal verification modules, and processed signal transmission modules;

[0006] The Beidou signal receiving module receives the time service signal and time-frequency signal of Beidou satellites, the signal analysis and processing module enhances the quality of the received signal, and the time-frequency signal extraction module extracts time information and frequency information from the enhanced Beidou signal;

[0007] The time-frequency signal verification module measures the extracted time information and frequency information, and the processed signal transmission module transmits the processed Beidou time information and frequency information to the user equipment, including a programmable digital signal processor and a filter.

[0008] Preferably, the quality enhancement includes signal amplification and filtering of the received time service signal and time-frequency signal.

[0009] Preferably, the Beidou signal receiving module includes a Beidou receiving antenna, a low-noise amplifier, and a signal processing unit.

[0010] Preferably, the time-frequency signal extraction module includes a time decoding unit and a frequency decoding unit, and the frequency decoding unit includes obtaining frequency information using a high-speed spectrum analyzer.

[0011] Preferably, the time-frequency signal verification module includes a time comparator, a time error analysis unit, and a frequency error analysis unit.

[0012] Preferably, the processed signal transmission module includes a wired transmission interface and a wireless transmission module. The wired transmission interface is a high-speed Ethernet interface and an optical fiber communication interface. The wireless transmission module includes Wi-Fi, Bluetooth, and ZigBee transmissions.

[0013] On the other hand, the present invention discloses a high-precision time-frequency signal transmission measurement method, including the following steps:

[0014] S1: Beidou signal reception;

[0015] S2: Signal quality enhancement;

[0016] S3: Signal time-frequency information extraction;

[0017] S4: Signal time-frequency information verification;

[0018] S5: Signal transmission.

[0019] Preferably, the signal reception in S1 includes receiving the time service signal and time-frequency signal of Beidou satellites through a Beidou receiving antenna, and a low-noise amplifier preliminarily amplifies the signal.

[0020] Preferably, in S2, it includes using a programmable digital signal processor to sample and digitize the intermediate-frequency signal output by the signal processing unit, and a filter bank performs precise filtering according to the signal frequency characteristics.

[0021] Preferably, in S3, it includes a time decoding unit parsing the time information of the enhanced signal to extract accurate time data; a frequency decoding unit obtaining the frequency information of the signal;

[0022] In S4, the time comparator in the time-frequency signal verification module compares the extracted time information with the reference time, and the time error analysis unit and the frequency error analysis unit respectively analyze the time difference and the frequency difference to evaluate the accuracy and stability of the time-frequency information.

[0023] The advantages of the present invention compared with the prior art are as follows: In the present invention, through the cooperation of components such as the time-frequency signal extraction module and the time-frequency signal verification module, the high-precision transmission and measurement of Beidou time-frequency signals are realized, with the advantages of high measurement accuracy, good stability, and simple operation, and can be widely applied to fields such as communication, navigation, positioning, and time service. Description of the Drawings

[0024] Figure 1 It is a schematic structural diagram of the process of a high-precision time-frequency signal transmission measurement method. Detailed implementation mode

[0025] The present invention will be further described in detail below with reference to the accompanying drawings.

[0026] Combined with the attached Figure 1 As shown, a high-precision time-frequency signal transmission measurement system includes multiple sets of Beidou signal receiving modules, signal analysis and processing modules, time-frequency signal extraction modules, time-frequency signal verification modules, and processed signal transmission modules;

[0027] The Beidou signal receiving module receives the time service signal and time-frequency signal of Beidou satellites. The signal analysis and processing module enhances the quality of the received signal. The time-frequency signal extraction module extracts time information and frequency information from the enhanced Beidou signal;

[0028] The time-frequency signal verification module measures the extracted time information and frequency information. The processed signal transmission module transmits the processed Beidou time information and frequency information to user equipment, including a programmable digital signal processor and a filter.

[0029] When the present invention is used, it includes the following steps:

[0030] S1: Beidou signal reception; S2: Signal quality enhancement; S3: Signal time-frequency information extraction; S4: Signal time-frequency information verification; S5: Signal transmission.

[0031] In one embodiment:

[0032] Quality enhancement includes signal amplification and filtering of the received time service signal and time-frequency signal. The Beidou signal receiving module includes a Beidou receiving antenna, a low-noise amplifier, and a signal processing unit;

[0033] The time-frequency signal extraction module includes a time decoding unit and a frequency decoding unit. The frequency decoding unit includes using a high-speed spectrum analyzer to obtain frequency information. At the same time, the time-frequency signal verification module includes a time comparator, a time error analysis unit, and a frequency error analysis unit. The processed signal transmission module includes a wired transmission interface and a wireless transmission module. The wired transmission interface is a high-speed Ethernet interface and an optical fiber communication interface. The wireless transmission module includes Wi-Fi, Bluetooth, and ZigBee transmissions.

[0034] When the present invention is specifically implemented, the signal reception in S1 includes receiving the time service signal and time-frequency signal of Beidou satellites through the Beidou receiving antenna, and the low-noise amplifier preliminarily amplifies the signal. In S2, it includes using a programmable digital signal processor to sample and digitize the intermediate-frequency signal output by the signal processing unit, and the filter bank performs precise filtering according to the signal frequency characteristics;

[0035] In S3, the time decoding unit analyzes the time information of the enhanced signal to extract accurate time data; the frequency decoding unit obtains the frequency information of the signal;

[0036] In S4, the time comparator in the time-frequency signal verification module compares the extracted time information with the reference time, and the time error analysis unit and the frequency error analysis unit respectively analyze the time difference and the frequency difference to evaluate the accuracy and stability of the time-frequency information.

[0037] In the present invention:

[0038] The Beidou signal receiving module can simultaneously receive the time service signals and time-frequency signals of multiple frequency bands of Beidou satellites, improving the sensitivity and reliability of signal reception. The low-noise amplifier is located between the antenna and the signal processing unit and is used to preliminarily amplify the received weak signal to reduce the noise interference in the subsequent processing. Specifically, the received satellite signal is converted into an electrical signal, amplified by the low-noise amplifier, and then sent to the signal processing unit. The signal processing unit performs processing such as filtering and down-conversion on the signal to convert the high-frequency signal into an intermediate-frequency signal for further processing by the subsequent modules;

[0039] The programmable digital signal processor (DSP) samples and digitizes the intermediate-frequency signal output by the signal processing unit, and then performs quality enhancement operations on the signal according to a preset algorithm, such as removing the noise and interference in the signal through an adaptive filtering algorithm, and using digital phase-locked loop technology to improve the frequency stability of the signal. The filter further purifies the signal.

[0040] The time decoding unit analyzes the time information of the enhanced signal. By capturing and tracking the navigation message in the Beidou signal, accurate time data such as year, month, day, hour, minute, second, etc. are extracted. The frequency decoding unit performs spectrum analysis on the signal using spectrum analysis technology and adopts frequency estimation algorithms such as maximum likelihood estimation to accurately obtain the frequency information of the signal.

[0041] The time comparator compares the extracted time information with the local reference time (such as the time provided by an atomic clock) to calculate the time difference. The time error analysis unit performs statistical analysis on the time difference to evaluate the accuracy and stability of the time information;

[0042] When transmitting the signal, according to the needs and actual situation of the user equipment, a suitable transmission method is selected. For user equipment that requires high-speed and long-distance transmission, the processed Beidou time information and frequency information are transmitted to the user equipment through a high-speed Ethernet interface or a fiber optic communication interface; for short-distance and portable user equipment, the information is transmitted to the user equipment through a wireless transmission module.

[0043] The content not described in detail in this specification belongs to the prior art well-known to those skilled in the art.

[0044] In the present invention, unless otherwise clearly defined and limited, the terms "installed", "connected", "connected to", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] The above description of the present invention and its embodiments is not restrictive. What is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Generally speaking, if those of ordinary skill in the art are inspired by it and, without departing from the gist of the present invention, design similar structural modes and embodiments to this technical solution without creative efforts, they shall fall within the protection scope of the present invention.

Claims

1. A high-precision time-frequency signal transmission measurement system, characterized in that: Multiple sets of Beidou signal receiving modules, signal analysis and processing modules, time-frequency signal extraction modules, time-frequency signal verification modules and processing signal transmission modules; The Beidou signal receiving module receives the timing signal and time-frequency signal of the Beidou satellite, the signal analysis and processing module enhances the quality of the received signal, and the time-frequency signal extraction module extracts time information and frequency information from the enhanced Beidou signal; The time-frequency signal verification module measures the extracted time information and frequency information, and the processed signal transmission module transmits the processed Beidou time information and frequency information to the user equipment, including a programmable digital signal processor and a filter.

2. A high-precision time-frequency signal transmission measurement system according to claim 1, characterized in that: The quality enhancement includes signal amplification and filtering of the received timing signal and time-frequency signal.

3. The high-precision time-frequency signal transmission measurement system according to claim 1, characterized in that: The Beidou signal receiving module includes a Beidou receiving antenna, a low noise amplifier and a signal processing unit.

4. The high-precision time-frequency signal transmission measurement system according to claim 1, characterized in that: The time-frequency signal extraction module includes a time decoding unit and a frequency decoding unit. The frequency decoding unit uses a high-speed spectrum analyzer to acquire frequency information.

5. The high-precision time-frequency signal transmission measurement system according to claim 1, characterized in that: The time-frequency signal verification module includes a time comparator, a time error analysis unit and a frequency error analysis unit.

6. The high-precision time-frequency signal transmission measurement system according to claim 1, characterized in that: The processing signal transmission module includes a wired transmission interface and a wireless transmission module. The wired transmission interface is a high-speed Ethernet interface and an optical fiber communication interface. The wireless transmission module includes Wi-Fi, Bluetooth, and ZigBee transmission.

7. A high-precision time-frequency signal transmission measurement method is applied to the high-precision time-frequency signal transmission measurement system according to claims 1-6, characterized in that: The following steps are involved: S1: Beidou signal reception; S2: signal quality enhancement; S3: signal time-frequency information extraction; S4: Signal time-frequency information verification; S5: Signal transmission.

8. A high-precision time-frequency signal transmission measurement method according to claim 7, characterized in that: The signal reception in S1 includes receiving the timing signal and time-frequency signal of the Beidou satellite through the Beidou receiving antenna, and the low-noise amplifier preliminarily amplifies the signal.

9. The high-precision time-frequency signal transmission measurement method according to claim 7, characterized in that: The S2 includes using a programmable digital signal processor to sample and digitally process the intermediate frequency signal output by the signal processing unit, and the filter group performs accurate filtering according to the signal frequency characteristics.

10. The high-precision time-frequency signal transmission measurement method according to claim 7, characterized in that: The S3 includes a time decoding unit that analyzes the time information of the enhanced signal to extract accurate time data; a frequency decoding unit that obtains the frequency information of the signal; The time comparator in the time-frequency signal verification module in S4 compares the extracted time information with the reference time, and the time error analysis unit and the frequency error analysis unit analyze the time difference and the frequency difference respectively to evaluate the accuracy and stability of the time-frequency information.

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