A Phase Self-Correction Method for Bias Temperature Drift Suppression of MEMS Gyroscopes

2020 ◽  
Vol 29 (12) ◽  
pp. 2050198
Author(s):  
Tao Yin ◽  
Yueshan Lin ◽  
Haigang Yang ◽  
Huanming Wu
Keyword(s):  
Phase Error ◽  
Correction Method ◽  
Temperature Drift ◽  
Vibratory Gyroscope ◽  
Significant Bias ◽  
Gyroscope System ◽  
Start Up ◽  
Mems Gyroscopes ◽  
System Bias ◽  
On Chip

Phase error of the demodulation clock in the Coriolis vibratory gyroscope system allows the quadrature errors to leak into the sense channel and causes significant bias and temperature drift at the rate output. A phase self-correction method to suppress the temperature drift of the bias in gyroscopes is proposed. Through sweeping the demodulation clock phase and simultaneously monitoring the mechanical quadrature error output in gyroscopes, the optimal demodulation clock phase with minimum relatively phase shift is determined. Thus the bias influenced by the temperature and surroundings can be calibrated on-chip at start-up or when the environment changes drastically without the requirement of the complicated instruments. The proposed approach is validated by a silicon MEMS gyroscope with the natural frequency of 2.8[Formula: see text]kHz, which shows nearly 22 times improvement in the temperature sensitivity of the system bias, from 550[Formula: see text]mdeg/s/∘C down to 24.7[Formula: see text]mdeg/s/∘C.

Enhancing the Security of FPGA-SoCs via the Usage of ARM TrustZone and a Hybrid-TPM

2022 ◽  
Vol 15 (1) ◽  
pp. 1-26
Author(s):  
Mathieu Gross ◽  
Konrad Hohentanner ◽  
Stefan Wiehler ◽  
Georg Sigl
Keyword(s):  
Software Design ◽  
Hardware Accelerators ◽  
Biometric Authentication ◽  
Trusted Platform Module ◽  
Start Up ◽  
Execution Environment ◽  
On Chip ◽  
Trusted Platform ◽  
Trusted Execution Environment ◽  
Entropy Source

Isolated execution is a concept commonly used for increasing the security of a computer system. In the embedded world, ARM TrustZone technology enables this goal and is currently used on mobile devices for applications such as secure payment or biometric authentication. In this work, we investigate the security benefits achievable through the usage of ARM TrustZone on FPGA-SoCs. We first adapt Microsoft’s implementation of a firmware Trusted Platform Module (fTPM) running inside ARM TrustZone for the Zynq UltraScale+ platform. This adaptation consists in integrating hardware accelerators available on the device to fTPM’s implementation and to enhance fTPM with an entropy source derived from on-chip SRAM start-up patterns. With our approach, we transform a software implementation of a TPM into a hybrid hardware/software design that could address some of the security drawbacks of the original implementation while keeping its flexibility. To demonstrate the security gains obtained via the usage of ARM TrustZone and our hybrid-TPM on FPGA-SoCs, we propose a framework that combines them for enabling a secure remote bitstream loading. The approach consists in preventing the insecure usages of a bitstream reconfiguration interface that are made possible by the manufacturer and to integrate the interface inside a Trusted Execution Environment.

Temperature and Humidity Effects on MEMS Vibratory Gyroscope

2011 ◽  
Vol 2011 (DPC) ◽  
pp. 001361-001390 ◽  
Author(s):  
Chandradip Patel ◽  
F. Patrick McCluskey ◽  
David Lemus
Keyword(s):  
Damage Mechanism ◽  
Consumer Electronics ◽  
Vibratory Gyroscopes ◽  
Root Cause ◽  
Vibratory Gyroscope ◽  
In Situ Data ◽  
Aging Test ◽  
Temperature And Humidity ◽  
Mems Gyroscopes ◽  
Gyroscope Sensor

MEMS vibratory gyroscopes are increasingly used in applications ranging from consumer electronics to aerospace and are now one of the most common MEMS products after accelerometers. Despite their widespread use, the performance of MEMS gyroscopes in harsh environments is still under question. While some studies have been conducted to understand the temperature dependent performance of MEMS gyroscopes, the effects of sustained exposure to temperature combined with other harsh environment stresses have not been well researched. Thus, it is necessary to quantify MEMS vibratory gyroscope performance under such conditions. This paper will focus on the combined effects of temperature and humidity only. Performance of the MEMS vibratory gyroscope will be evaluated over time at high temperature and high humidity conditions by conducting an aging test on a COTS (commercial of the shelf) single axis MEMS vibratory gyroscope having an operating temperature range from −40°C to 80°C. The gyroscope sensor will be exposed to 60 °C and 90% RH (Relative humidity) for 500 hours. In-situ data will be monitored to track any shifts in device output. Any permanent changes in the output signal will be traced back to their fundamental root cause damage mechanism.

Phase Error Correction Method Based on Multi-Level Fringe Order Correction

2020 ◽  
Vol 57 (17) ◽  
pp. 171201
Author(s):  
石博 Shi Bo ◽  
刘宏立 Liu Hongli ◽  
马子骥 Ma Ziji
Keyword(s):  
Error Correction ◽  
Phase Error ◽  
Correction Method ◽  
Order Correction ◽  
Fringe Order ◽  
Error Correction Method ◽  
Multi Level

scholarly journals Lightweight hardware fingerprinting solution using inherent memory in off-the-shelf commodity devices

2022 ◽  
Vol 25 (1) ◽  
pp. 105
Author(s):  
Mohd Syafiq Mispan ◽  
Aiman Zakwan Jidin ◽  
Muhammad Raihaan Kamarudin ◽  
Haslinah Mohd Nasir
Keyword(s):  
Integrated Circuit ◽  
Trusted Computing ◽  
Random Access ◽  
Process Variations ◽  
Computing System ◽  
Access Memory ◽  
Start Up ◽  
Non Volatile Memory ◽  
Memory Power ◽  
On Chip

An emerging technology known as Physical unclonable function (PUF) can provide a hardware root-of-trust in building the trusted computing system. PUF exploits the intrinsic process variations during the integrated circuit (IC) fabrication to generate a unique response. This unique response differs from one PUF to the other similar type of PUFs. Static random-access memory PUF (SRAM-PUF) is one of the memory-based PUFs in which the response is generated during the memory power-up process. Non-volatile memory (NVM) architecture like SRAM is available in off-the-shelf microcontroller devices. Exploiting the inherent SRAM as PUF could wide-spread the adoption of PUF. Therefore, in this study, we evaluate the suitability of inherent SRAM available in ATMega2560 microcontroller on Arduino platform as PUF that can provide a unique fingerprint. First, we analyze the start-up values (SUVs) of memory cells and select only the cells that show random values after the power-up process. Subsequently, we statistically analyze the characteristic of fifteen SRAM-PUFs which include uniqueness, reliability, and uniformity. Based on our findings, the SUVs of fifteen on-chip SRAMs achieve 42.64% uniqueness, 97.28% reliability, and 69.16% uniformity. Therefore, we concluded that the available SRAM in off-the-shelf commodity hardware has good quality to be used as PUF.

scholarly journals Significance of the Asymmetry of the Haltere: A Microscale Vibratory Gyroscope

2020 ◽  
Vol 2020 ◽  
pp. 1-9
Author(s):  
Rizuwana Parween
Keyword(s):  
Cross Sections ◽  
Strain Difference ◽  
Inertial Force ◽  
High Sensitivity ◽  
Ventral Surface ◽  
Small Scale ◽  
Mode Matching ◽  
Vibratory Gyroscopes ◽  
Vibratory Gyroscope ◽  
Mems Gyroscopes

Nature has evolved a beautiful design for small-scale vibratory gyroscopes in the form of halteres located in the metathorax region of the dipteran flies that detect body rotations based on the Coriolis principle. The specific design of the haltere is in contrast to the existing MEMS vibratory gyroscope, where the elastic beams supporting the proof mass are typically designed with symmetric cross-sections so that there is a mode matching between the actuation and sensing vibrations. The mode matching provides high sensitivity and low bandwidth. Hence, the objective of the manuscript is to understand the mechanical significance of the haltere’s asymmetry. In this study, the distributed Coriolis force and the corresponding bending stress by incorporating the actual mass variations along the haltere length are estimated. In addition, it is hypothesied that sensilla sense the rate of rotation based on the differential strain (difference between the final strain (strain due to the inertial and Coriolis forces) and the reference strain (strain due to inertial force)). This differential strain always occurs either on the dorsal or ventral surface of the haltere and at a distance away from the base, where the campaniform sensilla are located. This study brings out one specific feature—the asymmetric geometry of the haltere structure—that is not found in current vibratory gyroscope designs. This finding will inspire new designs of MEMS gyroscopes that have elegance and simplicity of the haltere along with the desired performance.

Performance Degradation of the MEMS Vibratory Gyroscope in Harsh Environments

2011 ◽  
Author(s):  
Chandradip Patel ◽  
Patrick McCluskey
Keyword(s):  
Test Procedure ◽  
Original Position ◽  
Harsh Environments ◽  
Mems Gyroscope ◽  
Vibratory Gyroscope ◽  
Wide Range ◽  
Before And After ◽  
Mems Gyroscopes ◽  
Baseline Testing ◽  
Commercial Off The Shelf

The use of MEMS gyroscopes in a wide range of applications requiring then to function from medium to harsh environments make it necessary to evaluate the performance of MEMS gyroscopes under those conditions. This paper focuses on the effects of elevated temperature and humidity on the performance of MEMS vibratory gyroscopes. Performance of the MEMS gyroscope was evaluated by conducting Highly Accelerated Stress Testing (HAST) on a COTS (commercial-off-the-shelf) single axis MEMS vibratory gyroscope having an operating temperature range from −40C to +105C. The gyroscope sensors were exposed to 130°C and 85% relative humidity with a pressure of 33.3 psia or 230 kPa for 96 hours. Pre-baking and post-baking tests were conducted before and after HAST at 125C for 24 hours respectively. Also, stationary baseline testing (SBT) and rotary baseline testing (RBT) were performed before and after the pre-baking, HAST and post-baking tests to measure any permanent shift during the respective test. A preliminary result shows that the MEMS gyroscope output degraded in the pre-baking test and HAST; while it showed a recovery in post-baking test. After completing the entire test procedure, it was observed that MEMS gyroscope output didn’t come back to the original position, and resulted in a permanent output shift of 1.85deg/s.

The Near-Field Correction Method of the Basic Array Error Based on a Single Auxiliary Vector Hydrophone

2012 ◽  
Vol 226-228 ◽  
pp. 493-499
Author(s):  
Huan Chen ◽  
Feng Xu ◽  
Da Hai Yu
Keyword(s):  
Error Correction ◽  
Near Field ◽  
Phase Error ◽  
Computing Time ◽  
Correction Method ◽  
Difficult Problem ◽  
Orientation Dependence ◽  
Joint Estimation ◽  
Vector Hydrophone ◽  
Source Orientation

The basic array error correction method based on a single auxiliary vector hydrophone is proposed for the difficult problem of the basic array error correction and the constraint of the space size of the tank. This method used the single vector hydrophone by precisely correction to implement non-fuzzy joint estimation of the source orientation and the orientation dependence of the basic array amplitude-phase error, and correct the error of the array element location. The method of this paper is applied to the arbitrary array structure, which doesn't exist the local convergence problem of the joint parameter estimation, only needs one-dimensional search for parameters which make the computing time less and can complete online in real-time.At last, the computer simulation verified the effectiveness of this method.

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