High-precision frequency measurement system and measurement method based on Beidou satellite

Abstract

The invention discloses a high-precision frequency measurement system based on a Beidou satellite. The high-precision frequency measurement system comprises a basic signal generation module, a Beidou signal receiving module, a signal processing module, a clock module, a counter module, a display module and an interface module, the interface module is electrically connected with external equipment, the basic signal generation module generates a reference frequency signal, and the Beidou signal receiving module receives a real-time Beidou satellite signal; the signal processing module carries out correction processing on Beidou satellite signals, and the display module displays measurement results. Compared with the prior art, the high-precision frequency measurement system and measurement method based on the Beidou satellite have the advantages of being convenient to operate and use and high in measurement precision.

Description

Technical Field

[0001] This invention relates to the field of BeiDou satellite technology, specifically to a high-precision frequency measurement system and method based on BeiDou satellites. Background Technology

[0002] With the rapid development of fields such as communication, navigation, and power synchronization, the demand for high-precision frequency measurement is increasing. The stability and accuracy of frequency signals directly affect system performance. For example, in scenarios such as 5G communication base station synchronization, power grid time reference, and aerospace navigation, even small frequency deviations can lead to major failures.

[0003] Frequency stability is a key factor affecting the performance stability of BeiDou time and frequency equipment, especially precision frequency source systems such as various atomic clocks and crystal oscillators. The accuracy that frequency stability measurement can achieve depends mainly on the frequency measurement method used, in addition to a high-precision reference source. Therefore, a high-precision frequency measurement method is needed. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the above-mentioned technical defects and provide a high-precision frequency measurement system and method based on Beidou satellite that is easy to operate and use and has high measurement accuracy.

[0005] To solve the above-mentioned technical problems, the technical solution provided by the present invention is: a high-precision frequency measurement system based on BeiDou satellite, characterized in that: it includes a basic signal generation module, a BeiDou signal receiving module, a signal processing module, a clock module, a counter module, a display module, and an interface module;

[0006] The interface module is electrically connected to the external device, the basic signal generation module generates a reference frequency signal, and the Beidou signal receiving module uses dual-frequency points to receive real-time Beidou satellite signals.

[0007] The signal processing module integrates a carrier phase smoothing pseudorange algorithm to correct the BeiDou satellite signal, and the display module displays the measurement results.

[0008] Preferably, the signal processing module includes a signal amplification unit, a filtering unit, and a frequency conversion unit;

[0009] The frequency conversion unit uses a superconducting quantum mixer.

[0010] Preferably, the display module is also connected to an alarm module, which is set with a dynamic threshold adjustment. The threshold baseline is calculated as 0.6 × (historical average) + 0.3 × (ionospheric TEC change rate) + 0.1 × (carrier acceleration modulus). When the value displayed by the display module is greater than the threshold, the alarm module will alert the user.

[0011] Preferably, the signal processing module further includes a built-in state monitoring unit, wherein the monitoring data is fused from multiple sources through Bayesian estimation, and the state monitoring unit collects and measures the operating status of the system.

[0012] Preferably, the operating status includes temperature, voltage, and signal-to-noise ratio, and the data information of the operating status is stored and uploaded through the interface module.

[0013] Preferably, the interface module integrates LoRaWAN and 5G NR dual-mode communication.

[0014] Preferably, the basic signal generation module includes a main oscillator, a backup oscillator, and an emergency oscillator.

[0015] Another aspect of this invention discloses a high-precision frequency measurement method based on the BeiDou satellite system, comprising the following steps:

[0016] S1: BeiDou signal reception and signal preprocessing;

[0017] S2: The processing result is obtained by comparing the BeiDou signal received in S1 with the reference frequency signal;

[0018] S3: Perform dynamic frequency optimization on the preliminary frequency measurement results obtained in S2 to output accurate measurement results;

[0019] S4: Display results and set thresholds for alarm monitoring;

[0020] S5: Monitors operational status and uploads and stores data.

[0021] Preferably, the dynamic supplementation in S3 includes data compensation for carrier attitude information and carrier motion information.

[0022] The advantages of this invention compared to the prior art are as follows: the measurement method is more adaptable to dynamic environments, the signal processing capability is improved, the integrated system settings facilitate signal uploading and storage, the anti-interference capability of the system is enhanced, and the compensation amount of the measurement signal can be superimposed to output a high-precision frequency value under dynamic environments. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of a high-precision frequency measurement system. Detailed Implementation

[0024] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings. Identical components are indicated by the same reference numerals.

[0025] It should be noted that the terms “front,” “back,” “left,” “right,” “up,” and “down” used in the following description refer to the directions shown in the attached diagram, while the terms “inside” and “outside” refer to the directions toward or away from the geometric center of a specific component, respectively.

[0026] To make the content of this invention easier to understand, the technical solutions in the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings.

[0027] Combined with appendix Figure 1 As shown, a high-precision frequency measurement system based on BeiDou satellites includes a basic signal generation module, a BeiDou signal receiving module, a signal processing module, a clock module, a counter module, a display module, and an interface module.

[0028] The interface module is electrically connected to the external device. The interface module integrates LoRaWAN and 5G NR dual-mode communication. The basic signal generation module generates a reference frequency signal. The basic signal generation module includes a main oscillator, a backup oscillator and an emergency oscillator. The Beidou signal receiving module uses dual frequency points to receive real-time Beidou satellite signals.

[0029] The signal processing module integrates a carrier phase smoothing pseudorange algorithm to correct the BeiDou satellite signal, and the display module displays the measurement results.

[0030] The BeiDou signal receiving module is a dual-frequency signal receiver, including a null-adjusting antenna array containing multiple sets of helical antenna elements. The signal processing module includes a signal amplification unit, a filtering unit, and a frequency conversion unit, which contains four sets of helical antenna elements. The signal processing module also includes a built-in status monitoring unit. The monitoring data is fused from multiple sources using Bayesian estimation. The status monitoring unit collects and measures the operating status of the system, including temperature, voltage, and signal-to-noise ratio. The operating status data is stored and uploaded through the interface module.

[0031] In actual use, the display module is also connected to an alarm module, which is equipped with a dynamic threshold adjustment algorithm.

[0032] Threshold baseline = 0.6 × (historical mean) + 0.3 × (ionospheric TEC change rate) + 0.1 × (carrier acceleration modulus)

[0033] The weighting coefficients are dynamically optimized using the online gradient descent method. The anomaly detection condition is that three consecutive sampling points exceed the threshold and the rate of change is greater than 5σ / s. When the value displayed by the display module is greater than the threshold, the alarm module will alert the user.

[0034] In specific implementation, this invention includes the following steps:

[0035] S1: BeiDou signal reception and signal preprocessing;

[0036] S2: The processing result is obtained by comparing the BeiDou signal received in S1 with the reference frequency signal;

[0037] S3: Perform dynamic frequency optimization on the preliminary frequency measurement results obtained in S2 to output accurate measurement results;

[0038] S4: Display results and set thresholds for alarm monitoring;

[0039] S5: Monitors operational status and uploads and stores data.

[0040] The dynamic supplement in S3 includes data compensation for carrier attitude information and carrier motion information.

[0041] The carrier attitude information and carrier motion information include the use of an inertial measurement unit integrated into the measurement system to collect the carrier's triaxial acceleration and angular velocity information in real time, combined with the position and velocity data output by the Beidou dual-frequency receiving module for dynamic compensation;

[0042] By combining BeiDou satellite signals, inertial navigation data, and carrier motion models, and establishing a time-varying function of frequency shift based on the carrier's attitude change rate and motion acceleration, the Doppler frequency shift and signal transmission delay caused by carrier motion can be eliminated.

[0043] It also includes clock synchronization for data verification, thereby outputting the results.

[0044] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0045] All standard parts used in this invention can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art, and the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here. The contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0046] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the invention, such designs should fall within the protection scope of the present invention.

Claims

1. A high-precision frequency measurement system based on BeiDou satellites, characterized in that: It includes a basic signal generation module, a BeiDou signal receiving module, a signal processing module, a clock module, a counter module, a display module, and an interface module; The interface module is electrically connected to the external device, the basic signal generation module generates a reference frequency signal, and the Beidou signal receiving module uses dual-frequency points to receive real-time Beidou satellite signals. The signal processing module integrates a carrier phase smoothing pseudorange algorithm to correct the BeiDou satellite signal, and the display module displays the measurement results.

2. The high-precision frequency measurement system based on BeiDou satellite according to claim 1, characterized in that: The BeiDou signal receiving module is a dual-frequency signal receiver, including a null-adjusting antenna array.

3. The high-precision frequency measurement system based on BeiDou satellite according to claim 1, characterized in that: The signal processing module includes a signal amplification unit, a filtering unit, and a frequency conversion unit; The frequency conversion unit uses a superconducting quantum mixer.

4. The high-precision frequency measurement system based on BeiDou satellite according to claim 1, characterized in that: The display module is also connected to an alarm module. The alarm module is set with a dynamic threshold adjustment. The threshold baseline is calculated as 0.6 × (historical average) + 0.3 × (ionospheric TEC change rate) + 0.1 × (carrier acceleration modulus). When the value displayed by the display module is greater than the threshold, the alarm module will alert the user.

5. A high-precision frequency measurement system based on BeiDou satellite according to claim 3, characterized in that: The signal processing module also includes a built-in state monitoring unit. The monitoring data is fused from multiple sources through Bayesian estimation. The state monitoring unit collects and measures the operating status of the system.

6. A high-precision frequency measurement system based on BeiDou satellite according to claim 5, characterized in that: The operating status includes temperature, voltage, and signal-to-noise ratio. The operating status data is stored and uploaded through the interface module.

7. A high-precision frequency measurement system based on BeiDou satellite according to claim 6, characterized in that: The interface module integrates LoRaWAN and 5G NR dual-mode communication.

8. A high-precision frequency measurement system based on BeiDou satellite according to claim 1, characterized in that: The basic signal generation module includes a main oscillator, a backup oscillator, and an emergency oscillator.

9. A high-precision frequency measurement method based on BeiDou satellite, applied to the high-precision frequency measurement system based on BeiDou satellite as described in any one of claims 1-6, characterized in that: Includes the following steps: S1: BeiDou signal reception and signal preprocessing; S2: The processing result is obtained by comparing the BeiDou signal received in S1 with the reference frequency signal; S3: Perform dynamic frequency optimization on the preliminary frequency measurement results obtained in S2 to output accurate measurement results; S4: Display results and set thresholds for alarm monitoring; S5: Monitors operational status and uploads and stores data.

10. A high-precision frequency measurement method based on BeiDou satellite according to claim 7, characterized in that: The dynamic supplementation in S3 includes data compensation for carrier attitude information and carrier motion information.

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