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| 1 | Integrity monitoring of fixed ambiguity Precise Point Positioning(PPP)solutions显示文摘Traditional positioning methods,such as conventional Real Time Kinematic(cRTK)rely upon local reference networks to enable users to achieve high-accuracy positioning.The need for such relatively dense networks has significant cost implications.Precise Point Positioning(PPP)on the other hand is a positioning method capable of centimeter-level positioning without the need for such local networks,hence providing significant cost benefits especially in remote areas.This paper presents the state-of-the-art PPP method using both GPS and GLONASS measurements to estimate the float position solution before attempting to resolve GPS integer ambiguities.Integrity monitoring is carried out using the Imperial College Carrier-phase Receiver Autonomous Integrity Monitoring method.A new method to detect and exclude GPS base-satellite failures is developed.A base-satellite is a satellite whose measurements are differenced from other satellite’s measurements when using between-satellite-differenced measurements to estimate position.The failure detection and exclusion methods are tested using static GNSS data recorded by International GNSS Service stations both in static and dynamic processing modes.The results show that failure detection can be achieved in all cases tested and failure exclusion can be achieved for static cases.In the kinematic processing cases,failure exclusion is more difficult because the higher noise in the measurement residuals increases the difficulty to distinguish between failures associated with the base-satellite and other satellites. | Altti JOKINEN Shaojun FENG Wolfgang SCHUSTER Washington OCHIENG Chris HIDE Terry MOORE Chris HILL | 2013 | Geo-Spatial Information Science2013，16，3： | 3 |
| 2 | Evolution of Air Traffic Management Concept of Operations and Its Impact on the System Architecture显示文摘The air traffic management system(ATM)has the task of ensuring safe,orderly and expeditious flow of air traffic.The ATM system architecture is very much dependent on the concept of operations(ConOps).Over the years the evolution in ConOps has resulted in changes in the ATM′s physical architecture,improving its physical infrastructure,increasing the levels of automation and making operational changes to improve air traffic flow,to cope with increasing demand for air travel.However,what is less clear is the impact of such changes in ConOps on the ATM′s functional architecture.This is vital for ensuring optimality in the implementation of the physical architecture components to support the ATM functions.This paper reviews the changes in the ConOps over the years,proposes a temporally invariant ATM functional model,and discusses some of the main key technologies expected to make significant improvements to the ATM system. | Washington Yotto Ochieng Milena Studic Arnab Majumdar | 2016 | Transactions of Nanjing University of Aeronautics and Astronautics2016，33，4： | 2 |
| 3 | Monitoring dioxins and PCBs in eggs as sensitive indicators for environmental pollution and global contaminated sites and recommendations for reducing and controlling releases and exposure显示文摘This review compiles information on PCDD/F-and PCB-contaminated eggs from 20 years of global egg monitoring around emission sources in four continents conducted by the International Pollutants Elimination Network(IPEN)and Arnika as well as a compilation of data from scientific literature.IPEN monitored 127 pooled egg samples including samples from 113 chicken flocks at potential PCDD/F-and PCB-contaminated sites around priority sources listed in the Stockholm Convention(e.g.waste incinerators,metal industries,cement plants,and open burning).99(88%)of pooled egg samples were above the EU maximum limits for PCDD/Fs(2.5 pg PCDD/F-TEQ/g fat)or the sum of PCDD/Fs and dioxinlike PCBs(5 pg PCDD/F-PCB-TEQ/g fat).Children consuming such eggs exceed the tolerable weekly intake(TWI).This demonstrates that close to 90%of these areas were not safe for the production of free-range eggs.Sixteen out of the 113 egg samples(14%)were contaminated above 50 pg TEQ/g fat and exceeded the EU maximum limit more than 10 times.From the 26 pooled egg samples around incinerators 24(92%)exceeded the limit with a mean of 43.1 pg TEQ/g fat(2.6e234 pg TEQ/g).All 21 egg samples around metal industries(4.4e112.6 pg TEQ/g fat)were above limits with mean concentration of 26.0 pg TEQ/g fat.Also all 7 egg samples measured at e-waste recycling sites were above limits(mean 308 pg TEQ/g fat).In 58(51%)pooled egg samples the PCB-TEQ was above 5 pg TEQ/g fat exceeding the EU maximum limit with dioxin-like PCBs alone.This highlights the role of commercial PCBs for global contamination with dioxin-like compounds.It was discovered that around metal industries,shredder plants,open burning sites of e-waste and dump sites,a high share of contamination was caused by dl-PCBs.This clearly shows severe PCB release from the end-of-life management of PCB-containing equipment in developing countries.Also highly contaminated eggs were found at many sites where plastic was incinerated.The highest contaminated egg sample ever measured came from an e-waste site in Ghana and had 856 pg TEQ/g fat plus 300 pg TEQ from brominated dioxins(PBDD/Fs).Other extreme PCDD/F contaminations of eggs were found at a chlor-alkali site(514 pg TEQ/g fat),Agent Orange contaminated areas in Vietnam(490,249 and 246 pg TEQ/g fat)and e-waste sites(568 and 520 pg TEQ/g fat).Where DR CALUX®bioassay revealed higher TEQ compared to measured PCDD/F-PCB-TEQ in IPEN studies,polybrominated PBDD/F were also measured and detected up to 300 pg TEQ/g fat at e-waste sites.One positive outcome from the IPEN studies is that all 10 pooled supermarket eggs in developing countries were below regulatory limit.Policy recommendations are made including:a systematic assessment of areas around PCDD/Fs and PCBs sources;measures for reduction of exposures of populations;urgent control of emission sources including PCB equipment,the open burning of plastic,and the use of plastic as fuel in boilers/incinerators in developing countries without air pollution control.Furthermore,soil limits need to be re-assessed and lowered for free-range poultry. | Jindrich Petrlik Lee Bell Joe DiGangi Serge Molly Allo'o Allo'o Gilbert Kuepouo Griffins Ochieng Ochola Valeriya Grechko Nikola Jelinek Jitka Strakova Martin Skalsky Yuyun Ismawati Drwiega Jonathan N.Hogarh Eric Akortia Sam Adu-Kumi Akarapon Teebthaisong Maria Carcamo Bjorn Beeler Peter Behnisch Claudia Baitinger Christine Herold Roland Weber | 2022 | Emerging Contaminants2022，8，1： | 2 |
| 4 | New methods for dual constellation single receiver positioning and integrity monitoring显示文摘Navigation system integrity monitoring is crucial for mission(e.g.safety)critical applications.Receiver autonomous integrity monitoring(RAIM)based on consistency checking of redundant measurements is widely used for many applications.However,there are many challenges to the use of RAIM associated with multiple constellations and applications with very stringent requirements.This paper discusses two positioning techniques and corresponding integrity monitoring methods.The first is the use of single frequency pseudorange-based dual constellations.It employs a new cross constellation single difference scheme to benefit from the similarities while addressing the differences between the constellations.The second technique uses dual frequency carrier phase measurements from GLONASS and the global positioning system for precise point positioning.The results show significant improvements both in positioning accuracy and integrity monitoring as a result of the use of two constellations.The dual constellation positioning and integrity monitoring algorithms have the potential to be extended to multiple constellations. | Shaojun FENG Altti JOKINEN Carl MILNER Washington OCHIENG | 2013 | Geo-Spatial Information Science2013，16，3： | 2 |
| 5 | A high accuracy fuzzy logic based map matching algorithm for road transport显示文摘 | Quddus M A Noland R B Ochieng W Y | 2006 | Jour- nal of Intelligent Transportation Systems2006，10，3： | 1 |
| 6 | Removal of nickel from wastewater using an agricultural adsorbent显示文摘 | Moodley Krishnie Singh Ruella Musapatika Evans T Onyango Maurice S Ochieng Aoyi | 2011 | Water SA2011，，1： | 1 |
| 7 | Current Map- matching Algorithms for Transport Applications: State- of-the Art and Future Research Directions 显示文摘 | Quddus M A Ochieng W Y Noland R B | 2007 | Transportation Research Part C:Emerging Technologies2007，15，5： | 1 |
| 8 | Risk Factors for Death among Children Less Than 5 Years Old Hospitalized with Diarrhea in Rural Western Kenya, 2005 -2007 : A Cohort Study 显示文摘 | 0' Reilly C E Jaron P Ochieng B et 01 | 2012 | PLoS Medicine2012，9，00： | 1 |
| 9 | Current map-matching algorithms for transport applications:State-of-the art and future research directions显示文摘 | Quddus M A Ochieng W Y Noland R B | 2007 | Transportation Research Part C:Emerging Technologies2007，15，5： | 1 |
| 10 | An Extended Kalman Filter algorithm for Integrating GPS and low - cost Dead re ckoning system data for vehicle performance and emissions Monitoring显示文摘 | Zhao Li W Y Ochieng M A Quddus R B Noland | 2003 | The Journal of Navigation2003，56，： | 1 |
| 11 | Fine structure and distribution of antennal sensilla of the desert locust, Schistocerca gregaria (Orthoptera: Acrididae) 显示文摘 | Ochieng A Hallberg E Hansson B | 1988 | Cell and Tissue Research1988，291，： | 1 |
| 12 | Mapmatching in Complex Urban Road Networks 显示文摘 | OCHIENG W Y QUDDUS M NOLAND R B | 2004 | Brazilian Journal of Cartography2004，55，2： | 1 |
| 13 | Galectin-3 is a novel substrate for human matrix metalloproteinases-2 and-9显示文摘 | Ochieng J Fridman R Nangia-Makker P | 1994 | Biochemistry1994，33，14： | 1 |
| 14 | Ratoon stunting disease surveys of the Mumias and South Nyanza mill areas in Kenya 显示文摘 | James G L Lukano M P Ochieng A A | 1995 | Sugar Cane1995，5，： | 1 |
| 15 | Map-matching in complex urban road networks显示文摘 | Ochieng W Y Quddus M A Noland R B | 2009 | Brazilian Journal of Cartog- raphy2009，55，2： | 1 |
| 16 | Detecting multiple failures in GPS/INS integrated system:A novel architecture for integrity monitoring显示文摘 | Bhatti U I Ochieng W Y | | 0，，01： | 1 |
| 17 | Manduca sexta serpin -7, a putative regulator of hemolymph prophenoloxidase ac- tivation显示文摘 | Suwanchaichinda C Ochieng R Zhuang S | 2013 | Insect Biochem Idol Biol2013，43，7： | 1 |
| 18 | Functional morphology of antennal chemoreceptors of the parasitoid Microplitis croceipes (Hy- menoptera: Braeonidae) 显示文摘 | Ochieng S A Park K C Zhu J W | 2000 | Arthropod Struct Dev2000，29，： | 1 |
| 19 | A General Map Matching Algorithm for Transport Telematics Applications 显示文摘 | Quddus M A Ochieng W Y Zhao Lin | 2003 | GPS Solutions2003，7，3： | 1 |
| 20 | Map- matching in complex urban road networks显示文摘 | OCHIENG W Y QUDDUS M NOLAND R B | 2003 | Brazilian Journal of Cartography2003，，： | 1 |
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