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2024 3rd International Conference on Aerospace and Control Engineering, ICoACE 2024

作者： Yang, Jianlei Jin, Zhengzhen Zheng, Shuaiyong Jin, Yaohaoran Hu, Na Zhao, Lili Key Laboratory of Satellite Navigation System and Equipment Technology Shijiazhuang050081 China The 54 Research Institute China Electronics Technology Group Shijiazhuang050081 China School of Integrated Circuit Science and Engineering Tianjin University of Technology Tianjin300384 China

Amidst the swift progress in unmanned aerial vehicle (UAV) technology, the enhancement of navigation precision and robustness is paramount for ensuring flight safety and managing the intricacies of various missions. This research presents a sophisticated, tightly integrated Global Navigation Satellite system (GNSS) and Strapdown Inertial Navigation system (SINS) navigation framework designed to synergize the capabilities of both systems, thereby mitigating their respective shortcomings in adverse environments. By utilizing an Extended Kalman Filter for the real-time calibration of inertial sensor errors, this system markedly enhances the navigation accuracy of UAVs. Our rigorous testing, conducted with genuine flight data, revealed that the integrated system surpasses standalone inertial navigation systems, especially in managing position errors, resulting in a 12.5% enhancement in overall navigation accuracy. This study solidifies the technical foundation for UAV applications and advances the development of future navigation systems. © 2025 Institute of Physics Publishing. All rights reserved.

关键词： Unmanned aerial vehicles (UAV)

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Design and analysis of GPS satellite-based augmentation system based on low earth orbit constellations 3

Design and analysis of GPS satellite-based augmentation syst...

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2024 3rd International Conference on Aerospace and Control Engineering, ICoACE 2024

作者： Yang, Jianlei Jin, Zhengzhen Zheng, Shuaiyong Huang, Shiyong Ma, Guoyu Ji, Shiran Key Laboratory of Satellite Navigation System and Equipment Technology Shijiazhuang050081 China The 54 Research Institute China Electronics Technology Group Shijiazhuang050081 China School of Integrated Circuit Science and Engineering Tianjin University of Technology Tianjin300384 China College of Software Tianjin Normal University Tianjin300387 China

Addressing the need for improved GPS accuracy, especially for low-dynamic users, this study introduces a GPS augmentation system employing Low Earth Orbit (LEO) satellites. We detail the principles of satellite navigation and augmentation and simulate the GPS-LEO constellation to analyse its performance in terms of satellite visibility and Position Dilution of Precision (PDOP). The results demonstrate substantial augmentation in navigation accuracy with the integrated system, as verified by UAV flight experiments. The integration of LEO satellites is anticipated to advance global navigation capabilities, with implications for intelligent transportation, logistics, and precision agriculture. © 2025 Institute of Physics Publishing. All rights reserved.

关键词： Global positioning system

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Multimodal proton and fluorescence image sensor for bio applications

Multimodal proton and fluorescence image sensor for bio appl...

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2011 IEEE/IFIP 19th International Conference on VLSI and system-on-Chip, VLSI-SoC 2011

作者： Nakazawa, Hirokazu Ishida, Makoto Sawada, Kazuaki Integrated Circuit and Sensor System Group Toyohashi University of Technology Toyohashi Japan

ISBN: (纸本)9781457701719

We developed a multimodal sensor for proton (pH, power of Hydrogen) and filter-less fluorescence imaging by using CMOS (complementary metal-oxide semiconductor) silicon integrated circuit technology. In the developed device, a proton sensor which uses CCD (charge-coupled device) image sensor technology and a filter-less fluorescence detection sensor are fused in the same pixel. Both pH and fluorescence images were first ever successfully obtained without optical filters or gratings and simultaneously in the same area in real time using the developed image sensor. © 2011 IEEE.

关键词： CMOS integrated circuits

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Linear ultra-broadband NPN-only analog correlator at 33 Gbps in 130 nm SiGe BiCMOS technology

Linear ultra-broadband NPN-only analog correlator at 33 Gbps...

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2016 IEEE Bipolar/BiCMOS circuits and technology Meeting, BCTM 2016

作者： Javed, A.R. Scheytt, J.C. Ahe, U.V.D. System and Circuit Technology Group Heinz Nixdorf Institute University of Paderborn Paderborn Germany

ISBN: (纸本)9781509004843

An ultra-broadband analog correlator consisting of a four-quadrant multiplier and an ultra-fast resettable integrator using only NPN transistors was designed, fabricated, and measured. For the integrator, a cross-coupled transistor pair is used as a negative resistance generator. A novel ultra-fast reset circuit is implemented which allows to reset the integrator within very short time of 120 ps. The chip was fabricated using 130 nm SiGe BiCMOS technology with fT of 250 GHz and fmax of 300 GHz. In the measurements carried out on printed circuit board, the correlator operated without noticeable performance degradation with inputs up to 33 Gbps which correspond to a bandwidth of more than 24 GHz. The correlator exhibits high linearity with output P1dB of more than 9.9 dBm (700 mVdiff) for both inputs. It dissipates 122.5 mW for the core circuit excluding the 50 Ω output driver. To the knowledge of the authors, the circuit represents the fastest analog correlator published so far. It can be used for spread spectrum communication, radar signal processing, and measurement applications. © 2016 IEEE.

关键词： Si-Ge alloys

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Optoelectronic Frequency Synthesizer With World-Record Phase Noise

Optoelectronic Frequency Synthesizer With World-Record Phase...

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2023 Optical Fiber Communications Conference and Exhibition, OFC 2023

作者： Bahmanian, Meysam Fard, Saeed Scheytt, Christoph Paderborn University System and Circuit Technology Group Heinz Nixdorf Institute Paderborn Germany

ISBN: (纸本)9781957171180

In this demo we show an ultra-low phase noise optoelectronic PLL (OEPLL) based on optical clock source. The output signal of this type of PLL is in the electrical domain and its reference oscillator, typically a mode-locked laser, operates in the optical domain. The OEPLL has a frequency range of 2-20 GHz. The OEPLL has an in-band phase noise of below -150 dBc/Hz at 100-kHz offset frequency for a carrier frequency of 10 GHz. This phase noise level is 10-20 dB better than state-of-the-art commercial frequency synthesizers. © 2023 The Author(s).

关键词： Phase locked loops

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Statistical moment estimation of delay and power in circuit simulation

Statistical moment estimation of delay and power in circuit ...

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作者： Nigam, Ashish Tang, Qin Zjajo, Amir Berkelaar, Michel Van Der Meijs, Nick Circuit and System Group Delft University of Technology Mekelweg 4 2628 CD Delft Netherlands

Monte Carlo methods and simulation are often used to estimate the mean, variance, and higher order statistical moments of circuit properties like delay and power. The main issues with Monte Carlo methods are the required long run time and the need for prior detailed knowledge of the distribution of the variations. Additionally, most of available circuit simulation tools can run Monte Carlo analysis for Gaussian, lognormal and uniform distribution only. In this paper, in order to estimate these statistical moments, we propose a new method based on a uniform sampling technique and a weighted sample estimator. The proposed method needs significantly fewer simulation runs, and does not need detailed prior knowledge of the variation distributions. Furthermore, it can be used for any type of probability distribution irrespective of the circuit simulation tool used for the analysis. The results obtained show that the proposed method needs lOOx fewer simulations iterations than Monte Carlo runs for accurate moments estimation of delay and power for standard cells in 45 nm and 32 nm technologies. Copyright © 2010 American Scientific Publishers All rights reserved.

关键词： circuit simulation

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A Bluetooth scatternet for the Khepera robot

A Bluetooth scatternet for the Khepera robot

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4th International Symposium on Autonomous Minirobots for Research and Edutainment, AMiRE 2007

作者： Du, Jia Lei Witkowski, Ulf Rückert, Ulrich System and Circuit Technology Research Group Heinz Nixdorf Institute University of Paderborn 33102 Paderborn Germany

Radio-based communication plays a vital role in multi-robot systems. Bluetooth is an energy-efficient communication technology suited for resource-limited mini-robots such as the Khepera. However, the maximum number of nodes in a Bluetooth piconet is limited, while scatternets-networks of piconets-have not been fully specified. In this paper we present a Bluetooth scatternet using Bluetooth communication sticks developed in our research group. In our solution, bridge nodes carrying two of such Bluetooth sticks are used to interconnect piconets. Beside the developed hardware, issues such as routing as well as topology control are addressed. Finally, data rate and latency measurements are presented for the implemented solution.

关键词： Multipurpose robots

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FPGA based speech processing for the Khepera robot

FPGA based speech processing for the Khepera robot

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4th International Symposium on Autonomous Minirobots for Research and Edutainment, AMiRE 2007

作者： El-Habbal, Mohamed Witkowski, Ulf Rueckert, Ulrich System and Circuit Technology Research Group Heinz Nixdorf Institute University of Paderborn 33102 Paderborn Germany

Although stochastic models of speech signals (e.g. hidden Markov models, trigrams, etc) have lead to impressive improvements in speech recognition accuracy, it has been noted that these models have little relationship to speech production, and their recognition performance on some important tasks is far from perfect. However, there have been recent attempts to bridge the gap between speech production and speech recognition using models that are stochastic and yet make more reasonable assumptions about the mechanisms underlying speech production. A new technique, which is given the name "Letter Identification", is developed for the Khepera robot application, mainly to control the movement of the robot's mobile base and suit all the application's constraints. The recognition technique, together with the necessary software and hardware implementation, are described in this paper.

关键词： Speech recognition

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CSD: Cell-based service discovery in large-scale robot networks

CSD: Cell-based service discovery in large-scale robot netwo...

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作者： Du, Jia Lei Witkowski, Ulf Rückert, Ulrich System and Circuit Technology Research Group Heinz Nixdorf Institute University of Paderborn 33102 Paderborn Germany

ISBN: (纸本)0780389123

If robots are deployed in large numbers in our environment in future, collaboration between the presumably specialized robots will be essential for a successful operation. The robots will set up mobile ad-hoc networks for communication and efficient routing and discovery protocols for such robot networks will provide the basic layer for a successful collaboration of the robots. In this paper we present a service discovery protocol that allows robots to efficiently discover available services in the network. It is specifically designed for large-scale robot networks. It takes into account the high dynamics of robot networks and exploits the position data of the robots to increase scalability and efficiency. A cellbased grid with master nodes in each cell forms the basic structure. Through proactive intra-cell communication and reactive inter-cell communication, scalability is ensured and the effects of node movements on the overall network are minimized. We implemented our solution in an example scenario. © 2005 IEEE.

关键词： Multipurpose robots

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A boostless write optimised single ended robust 7T SRAM cell for ultra-low power memory design

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International Journal of Electronics Letters 2017年第1期5卷 13-25页

作者： Kushwah, C.B. Vishvakarma, S.K. Dwivedi, D. Nanoscale Devices VLSI Circuit and System Design Lab Electrical Engineering IIT Indore MP India System Technology Group IBM Bangalore KA India

A boostless 7T static random access memory SRAM cell with high writability, improved stability and reduced read failure is proposed. The proposed 7T utilises feedback cutting during write operation, which does not require a boosted supply for single access transistor. This technique enhances the writability of the SRAM cell at ultra-low voltage (ULV) supply without any write assist at 90 and 20 nm technology nodes. The proposed 7T SRAM cell has write trip point (WTP) at 85.25 mV, whereas 5T fails to write ‘1’. The mean to sigma ratio (µ/σ) is improved by a factor of 1.08× and 7.14× for hold static noise margin (HSNM) and read margin, respectively, as compared to standard 5T at 300 mV in UMC 90 nm process technology. This also saves 26.41% read and 22.72% write power as compared to 5T SRAM cell at 300 mV. Moreover 7T also shows an improvement of 2.91% in HSNM and 1.85% in read margin by using FinFET technology. © 2015 Informa UK Limited, trading as Taylor & Francis group.

关键词： Boostless single ended SRAM ultra-low power

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