Silicon photon gyroscope with data storage and protection functions

Abstract

The invention provides a silicon photon gyroscope with data storage and protection functions. The silicon photon gyroscope comprises an optical chip module, a signal processing module, a micro-control unit, a safety storage module, a safety protection module and an external communication interface, the optical chip module outputs the interference electric signal to the signal processing module; the signal processing module is used for outputting the obtained digital phase difference to the micro-control unit; the micro-control unit is used for storing non-secret information into a public data area in the security storage module and outputting sensitive information to the security protection module; the data protection and alarm module is also used for executing a data protection and alarm mechanism after receiving the'exception 'instruction; the security protection module is used for storing the encrypted sensitive information into an encrypted data area in the security storage module; and the control unit is also used for authenticating the authority of the external access equipment, outputting final angular velocity information through the external communication interface if the external access equipment is authenticated to be safe, and sending an abnormal instruction to the micro-control unit if the external access equipment is authenticated to be abnormal.

Description

Technical Field

[0001] This invention relates to the field of optical inertial sensing technology, and more particularly to a silicon photonic gyroscope with data storage and protection functions. Background Technology

[0002] With the development of micro-nano fabrication and silicon-based optoelectronic technology, silicon photonic gyroscopes (SPGs) have become one of the core components of next-generation inertial navigation systems due to their advantages such as small size, light weight, low cost, and ease of mass production. Traditional fiber optic gyroscopes (FOGs), while stable in performance, are large and expensive; while mechanical gyroscopes are susceptible to shock. In contrast, silicon photonic gyroscopes achieve miniaturization and integration by integrating key optical components such as light sources, modulators, waveguides, and detectors onto a single silicon chip. However, existing silicon photonic gyroscope systems generally suffer from the following problems:

[0003] (1) Lack of local data storage capability: Most systems only realize the real-time output of angular velocity signals and are not equipped with local non-volatile storage units. Once communication is interrupted or the main control system crashes, key operating data (such as zero bias, scaling factor, temperature drift, and fault log) will be lost and cannot be used for post-event analysis and fault tracing.

[0004] (2) Insufficient data security: In sensitive applications such as military and aerospace, gyroscope output data is easily stolen or tampered with, and existing systems lack data encryption, identity authentication and anti-replay attack mechanisms.

[0005] (3) Weak anti-interference capability: Environmental factors such as strong electromagnetic interference (EMI), power fluctuations, and temperature changes can easily cause abnormal gyroscope output, but the system lacks the function of automatic identification, recording and alarm of abnormal events.

[0006] (4) No self-diagnosis and health monitoring mechanism: The system's operating status (such as light source power decay, modulator aging, and detector response decline) cannot be recorded for a long time, making it difficult to achieve predictive maintenance.

[0007] (5) Lack of data integrity protection: In the event of power failure, restart, etc., no mechanism such as check code or redundant storage is used to ensure data integrity.

[0008] To address the aforementioned issues, a novel silicon photonic gyroscope system with data storage, encryption, anomaly monitoring, and anti-interference protection functions is urgently needed. Some research has attempted to introduce storage modules into inertial systems; for example, CN112326234A discloses a MEMS gyroscope with storage functionality, but it is a mechanical structure and does not involve photonic systems. CN114563872B proposes a fiber optic gyroscope data recording method, but it lacks integrated encryption and active protection mechanisms, and the system is bulky and unsuitable for silicon photonic platforms. Therefore, developing a highly integrated, secure, reliable silicon photonic gyroscope with autonomous data management capabilities has significant engineering value and strategic importance. Summary of the Invention

[0009] This invention provides a silicon photonic gyroscope with data storage and protection functions, which can solve the technical problems of existing silicon photonic gyroscopes, such as lack of local data storage, poor data security, weak anti-interference ability, and lack of fault traceability.

[0010] This invention provides a silicon photonic gyroscope with data storage and protection functions, including an optical chip module, a signal processing module, a microcontroller unit, a secure storage module, a security protection module, and an external communication interface;

[0011] The optical chip module includes a laser, a beam splitter, an interference ring, a phase modulator, and a photodetector. The laser emits a laser beam that is split into two paths by the beam splitter and enters the interference ring. The two laser beams rotate clockwise and counterclockwise within the interference ring, respectively, generating a Sagnac phase difference, and return to the phase modulator to form an interference optical signal. The photodetector converts the interference optical signal into an interference electrical signal and outputs it to the signal processing module.

[0012] The signal processing module is used to amplify, filter and demodulate the interference electrical signal to obtain the original angular velocity information, digitize the original angular velocity information to obtain the digital phase difference, and output it to the microcontroller unit.

[0013] The microcontroller unit is used to acquire the final angular velocity information based on the digital phase difference, classify the final angular velocity information and the silicon photonic gyroscope data stream, store non-confidential information in the public data area of ​​the secure storage module, and output sensitive information to the security protection module; it is also used to execute data protection and alarm mechanisms after receiving an "abnormal" command.

[0014] The security protection module is used to encrypt sensitive information using an encryption engine and store the encrypted sensitive information in the encrypted data area within the secure storage module; it is also used to authenticate the permissions of external access devices. If the external access device is authenticated as "secure", the final angular velocity information is output through the external communication interface; if the external access device is authenticated as "abnormal", an "abnormal" command is sent to the microcontroller unit.

[0015] Preferably, the non-confidential information includes angular velocity information, temperature, and timestamp; the sensitive information includes the original interference signal, zero-bias sequence, system log, and encryption key.

[0016] Preferably, the external communication interface supports SPI, I... 2 C. CAN or Ethernet.

[0017] Preferably, the security protection module uses AES-128 or the national cryptographic algorithm SM4 for encryption.

[0018] The present invention provides a silicon photonic gyroscope that integrates real-time data storage, abnormal state recording, multi-level data encryption, and anti-interference protection mechanisms. This silicon photonic gyroscope can achieve high-precision measurement of angular velocity signals, secure local storage of critical operational data, and traceable playback of abnormal events in complex environments such as wide temperature ranges, strong vibrations, and electromagnetic interference, significantly improving the reliability, safety, and fault diagnosis capabilities of inertial navigation systems. Attached Figure Description

[0019] The accompanying drawings, which form part of this specification, are provided to further illustrate embodiments of the invention and, together with the textual description, explain the principles of the invention. It is obvious that the drawings described below are merely some embodiments of the invention, and those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0020] Figure 1 A schematic diagram of a silicon photonic gyroscope with data storage and protection functions according to an embodiment of the present invention is shown;

[0021] Figure 2 It shows Figure 1 Diagram of the dual-zone storage architecture of the central security storage module;

[0022] Figure 3 It shows Figure 1 Flowchart of the dual-zone storage architecture operation of the central security storage module. Detailed Implementation

[0023] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0025] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0026] like Figure 1 As shown, the present invention provides a silicon photonic gyroscope with data storage and protection functions, including an optical chip module, a signal processing module, a microcontroller unit, a secure storage module, a security protection module, and an external communication interface;

[0027] The optical chip module includes a laser, a beam splitter, an interference ring, a phase modulator, and a photodetector. The laser emits a laser beam that is split into two paths by the beam splitter and enters the interference ring. The two laser beams rotate clockwise and counterclockwise within the interference ring, respectively, generating a Sagnac phase difference, and return to the phase modulator to form an interference optical signal. The photodetector converts the interference optical signal into an interference electrical signal and outputs it to the signal processing module.

[0028] The signal processing module is used to amplify, filter and demodulate the interference electrical signal to obtain the original angular velocity information, digitize the original angular velocity information to obtain the digital phase difference, and output it to the microcontroller unit.

[0029] The microcontroller unit is used to acquire the final angular velocity information based on the digital phase difference, classify the final angular velocity information and the silicon photonic gyroscope data stream, store non-confidential information in the public data area of ​​the secure storage module, and output sensitive information to the security protection module; it is also used to execute data protection and alarm mechanisms after receiving an "abnormal" command to ensure data integrity and system security; wherein, the non-confidential information includes angular velocity information, temperature and timestamp; the sensitive information includes the original interference signal, zero-bias sequence, system log and encryption key;

[0030] The security protection module is used to encrypt sensitive information using an encryption engine with AES-128 or the national cryptographic SM4 algorithm, and store the encrypted sensitive information in the encrypted data area within the secure storage module; it is also used to authenticate the permissions of external access devices. If the external access device is authenticated as "secure", the final angular velocity information is output through the external communication interface; if the external access device is authenticated as "abnormal", an "abnormal" command is sent to the microcontroller unit; wherein, the external communication interface supports SPI, I2C, CAN or Ethernet.

[0031] To gain a further understanding of the present invention, the following description is provided in conjunction with... Figures 1-3 The silicon photonic gyroscope with data storage and protection functions of the present invention will be described in detail.

[0032] like Figure 1 As shown, the silicon photonic gyroscope comprises the following six parts: (1) Optical chip module: integrating laser, beam splitter, phase modulator, interference ring, and photodetector; (2) Signal processing module: demodulating the received signal and extracting angular velocity information; (3) Microcontroller unit (MCU): responsible for system scheduling, data processing, and control logic execution; (4) Secure storage module: including non-volatile memory (NVM) for storing angular velocity data, environmental parameters, system logs, and encryption keys; (5) Security protection module: integrating encryption engine, identity authentication unit, anomaly detector, and power monitoring circuit; (6) External communication interface: supporting SPI, I2C, CAN, or Ethernet for data upload and remote configuration.

[0033] like Figure 2The diagram shows the dual-zone storage architecture of the secure storage module, which includes: (1) Public data zone: storing desensitized angular velocity, temperature, timestamps and other publicly available data; (2) Encrypted data zone: storing original interference signals, zero-biased sequences, keys and fault logs, encrypted using AES-128 or the national cryptographic SM4 algorithm.

[0034] like Figure 3 The diagram shown is a flowchart of the dual-zone storage architecture operation of the security storage module.

[0035] The process begins with the system power-on initialization phase, where the microcontroller performs a self-test on the storage module to confirm that both the public data area and the encrypted data area can be read and written normally, and loads the preset master key to prepare for subsequent secure operations.

[0036] The system then enters the data acquisition phase, where it acquires the operating parameters of the silicon photonic gyroscope in real time, including angular velocity, chip temperature, power supply voltage, timestamp, and system status.

[0037] The collected data is sent to the classification and judgment stage: if the data belongs to basic operational information that can be made public (such as angular velocity, temperature, etc.), it is judged as public data and written directly into the public data area in plaintext form for authorized devices to read at any time; if the data involves sensitive content such as original interference signals, zero bias sequences, fault logs, etc., it is judged as encrypted data and must be encrypted by an encryption engine (such as AES-128 or SM4 algorithm) before being written into the encrypted data area to ensure data security.

[0038] During system operation, continuous monitoring is conducted to detect any abnormal events (such as severe vibration, voltage drops, electromagnetic interference, etc.). Once an abnormality is detected, an "emergency snapshot" mechanism is immediately triggered, which packages and encrypts key data within a certain period before and after the event and stores it in a dedicated event log area within the encrypted zone for subsequent fault tracing.

[0039] When an external device initiates a data read request, the system determines the request type: if it only requests access to the public data area, it directly returns the corresponding information; if it requests access to the encrypted data area, it initiates an authentication mechanism, using a challenge-response method to verify access permissions. Only after successful authentication will the system decrypt the encrypted data and return the plaintext data to prevent unauthorized access.

[0040] In addition, the system has power failure protection capabilities. When the power management unit detects an abnormal drop in power supply, it uses backup power to maintain power supply briefly, saves the current critical state, and ensures that no data is lost.

[0041] The entire process achieves intelligent data classification, secure storage, anomaly logging, and controlled access, balancing system availability and security, and is particularly suitable for high-reliability inertial navigation scenarios.

[0042] In this embodiment, the security protection module has the following functions: (1) real-time monitoring of the statistical characteristics (mean, variance, spectrum) of the gyroscope output signal. When the deviation from the normal model exceeds the threshold, it is judged as abnormal and the event is recorded; (2) the hash chain mechanism is used to link continuous data blocks to prevent historical data from being tampered with; (3) support challenge-response authentication to prevent unauthorized devices from accessing the system; (4) when a voltage drop or electromagnetic pulse (EMP) is detected, the "emergency snapshot" mode is automatically started to save the current system state.

[0043] Specifically, the secure storage module adopts a triple data protection mechanism: (1) CRC-32 check: Each record is attached with a cyclic redundancy check code; (2) ECC error correction: Hamming code or BCH code is used to correct single-bit errors in the storage medium; (3) Dual copy storage: Critical data is stored in two copies in different physical sectors, and a "write first, erase later" strategy is adopted when writing to prevent data corruption caused by write interruption.

[0044] Specifically, the anomaly detection employs a sliding window Kalman residual analysis method, defining the observation residual as:

[0045] r k =z k -H k x k I k-1

[0046] In the formula, r k Let z be the observation residual at time k. k Let x be the measured angular velocity value at time k. k I k-1 H represents the predicted angular velocity state at time k-1. k Let be the observation matrix at time k.

[0047] Calculate the variance of the residuals within the sliding window:

[0048]

[0049] In the formula, σ 2 r (k) is the variance of the sliding window residuals at time k, n is the fixed length of the sliding window, i = k-n+1 to k is the index range of the window, representing taking all residuals from time k-n+1 to the current time k, ri is the observation residual at time i, μr(k) is the mean of the residuals in the current window, and 1 / (n-1) is the correction term for the unbiased estimate.

[0050] When σ 2 r (k)>σ 2th When an exception is triggered, an event log is generated and written to the encrypted area.

[0051] In this embodiment, the data encryption employs a dynamic key update mechanism:

[0052] per T key =1 (unit: hour) to update session key K once s The update method is as follows:

[0053]

[0054] In the formula, K sn For the nth generation new session key, K sn-1 For the (n-1)th generation old session key, SHA-256 is the SHA-256 hash function. The XOR operator is used, and RAND is a random number output by a hardware true random number generator.

[0055] In addition, the silicon photonic gyroscope also supports a data playback mode: triggered by an external command, it can read historical angular velocity data within a time range for fault analysis and system calibration.

[0056] In summary, this invention provides a silicon photonic gyroscope with data storage and protection functions, integrating real-time data storage, abnormal state recording, multi-level data encryption, and anti-interference protection mechanisms. This silicon photonic gyroscope can achieve high-precision measurement of angular velocity signals, secure local storage of critical operating data, and traceable playback of abnormal events in complex environments such as wide temperature ranges, strong vibrations, and electromagnetic interference, significantly improving the reliability, safety, and fault diagnosis capabilities of inertial navigation systems.

[0057] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0058] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0059] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A silicon photonic gyroscope with data storage and protection functions, characterized in that, It includes an optical chip module, a signal processing module, a microcontroller unit, a secure storage module, a security protection module, and an external communication interface; The optical chip module includes a laser, a beam splitter, an interference ring, a phase modulator, and a photodetector. The laser emits a laser beam that is split into two paths by the beam splitter and enters the interference ring. The two laser beams rotate clockwise and counterclockwise within the interference ring, respectively, generating a Sagnac phase difference, and return to the phase modulator to form an interference optical signal. The photodetector converts the interference optical signal into an interference electrical signal and outputs it to the signal processing module. The signal processing module is used to amplify, filter and demodulate the interference electrical signal to obtain the original angular velocity information, digitize the original angular velocity information to obtain the digital phase difference, and output it to the microcontroller unit. The microcontroller unit is used to acquire the final angular velocity information based on the digital phase difference, classify the final angular velocity information and the silicon photonic gyroscope data stream, store non-confidential information in the public data area of ​​the secure storage module, and output sensitive information to the security protection module; it is also used to execute data protection and alarm mechanisms after receiving an "abnormal" command. The security protection module is used to encrypt sensitive information using an encryption engine and store the encrypted sensitive information in the encrypted data area within the secure storage module; it is also used to authenticate the permissions of external access devices. If the external access device is authenticated as "secure", the final angular velocity information is output through the external communication interface; if the external access device is authenticated as "abnormal", an "abnormal" command is sent to the microcontroller unit.

2. The silicon photonic gyroscope according to claim 1, characterized in that, The non-confidential information includes angular velocity information, temperature, and timestamp; the sensitive information includes the original interference signal, zero-bias sequence, system log, and encryption key.

3. The silicon photonic gyroscope according to claim 1, characterized in that, The external communication interface supports SPI, I2C, CAN, or Ethernet.

4. The silicon photonic gyroscope according to claim 1, characterized in that, The security protection module uses AES-128 or the national cryptographic SM4 algorithm for encryption.

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