Intelligent Computational Geodesy and PNT (ICG-PNT) Lab

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Sat, 01 Jun 2030 13:00:00 +0000

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Welcome to the ICG-PNT Lab

Tue, 16 Jun 2026 00:00:00 +0000

We are pleased to welcome you to the Intelligent Computational Geodesy and PNT (ICG-PNT) Lab at the Department of Land Surveying and Geospatial Science (LSGS), The Hong Kong Polytechnic University.

The ICG-PNT Lab develops rigorous theory, algorithms, and intelligent systems for high-precision Positioning, Navigation, and Timing (PNT). Our research connects computational geodesy, GNSS, Low Earth Orbit (LEO) satellites, lunar and deep-space navigation, and resilient alternative PNT technologies.

Our work is grounded in geodetic estimation theory and focuses on robust integer ambiguity resolution, precise atmospheric modeling, real-time orbit determination, and AI-enabled navigation. By combining physical models with data-driven methods, we aim to build smarter, more reliable, and more adaptive PNT systems for scientific, industrial, and societal applications.

The lab's research spans several interconnected directions:

Geodetic data processing and multi-domain high-precision GNSS positioning
Real-time precise orbit determination and LEO-based PNT
Lunar and deep-space PNT and space geodesy
Resilient and alternative PNT, including multi-sensor fusion and integrity monitoring

Through these directions, the ICG-PNT Lab supports applications across land, low-altitude airspace, ocean, LEO satellite systems, and future lunar and deep-space missions. We are especially interested in positioning infrastructure for smart cities, the Greater Bay Area low-altitude economy, autonomous systems, satellite-based services, and next-generation space exploration.

We warmly welcome students, researchers, industry partners, and international collaborators who share an interest in intelligent computational geodesy and advanced PNT systems. This website will share our latest research news, publications, projects, and group activities.

Welcome to the ICG-PNT Lab.

Research

Sat, 23 May 2026 00:00:00 +0000

Kinematic orbit determination for BDS-3 satellites with inter-satellite link data

Wed, 01 Apr 2026 00:00:00 +0000

Fast and precise GNSS RTK positioning with ionosphere-constrained weighted least squares quadratic programming

Sun, 01 Feb 2026 00:00:00 +0000

Ionospheric nonlinear interpolation model for Mid- and Low-latitude network RTK during solar maxima

Sun, 01 Feb 2026 00:00:00 +0000

Improving GNSS precise point positioning with tropospheric constraints from data-driven numerical weather prediction model

Fri, 02 Jan 2026 00:00:00 +0000

Effect of Constraining a Limited Number of Slant Ionospheric Corrections in PPP and an Improved Partial Tight-Constraining Algorithm

Thu, 01 Jan 2026 00:00:00 +0000

GNSS Positioning Aided with Pedestrian Dead Reckoning (PDR) in Urban Areas

Thu, 01 Jan 2026 00:00:00 +0000

Bridging missing GNSS phase measurements through cycle slip detection for improved smartphone positioning

Wed, 01 Oct 2025 00:00:00 +0000

Multi-constellation instantaneous single difference triple-carrier ambiguity resolution in urban environments

Wed, 01 Oct 2025 00:00:00 +0000

A Novel Optimized Hybrid VMD-PCA-XGBoost Model for Forecasting Precipitation: Exemplified by the Beijing-Tianjin-Hebei Study Region in China

Mon, 07 Jul 2025 00:00:00 +0000

Development of an Ellipsoid Based Chart Datum Around the China Seas

Fri, 04 Jul 2025 00:00:00 +0000

A Novel Network RTK Technique for Mobile Platforms: Extending High-Precision Positioning to Offshore Environments

Sun, 01 Jun 2025 00:00:00 +0000

Accurate extraction of ocean tidal constituents from coastal satellite altimeter records

Thu, 29 May 2025 00:00:00 +0000

A new high-precision short-term ionospheric TEC prediction model based on the DBO-BiLSTM algorithm: A case study of Europe

Thu, 01 May 2025 00:00:00 +0000

Array-Aided GNSS for Precise Determination of Ionospheric and Tropospheric Delays With Integer Ambiguity Resolution

Fri, 18 Apr 2025 00:00:00 +0000

Spatiotemporal inhomogeneity of accuracy degradation in AI weather forecast foundation models: A GNSS perspective

Fri, 21 Mar 2025 00:00:00 +0000

Enhancing GNSS Positioning Accuracy in Urban Canyons: A Multi-Epoch Residual-Based Consistency Check and IMU-GNSS Tight Coupling Approach

Tue, 18 Mar 2025 00:00:00 +0000

Multiepoch Grid-Based 3DMA Positioning in Dense Urban Canyons by Optimizing Reflection Modeling

Tue, 25 Feb 2025 00:00:00 +0000

A Combination of Classification Robust Adaptive Kalman Filter with PPP-RTK to Improve Fault Detection for Integrity Monitoring of Autonomous Vehicles

Wed, 15 Jan 2025 00:00:00 +0000

Evaluation and analysis of the precipitable water vapor in Inner Mongolia of China

Wed, 01 Jan 2025 00:00:00 +0000

Frequency Stability-Aware Stochastic Modeling for Inter-System Bias in Multi-GNSS PPP

Wed, 01 Jan 2025 00:00:00 +0000

Forecasting of Tropospheric Delay Using AI Foundation Models in Support of Microwave Remote Sensing

Fri, 01 Nov 2024 00:00:00 +0000

Tightly Coupled Bluetooth Enhanced GNSS/PDR System for Pedestrian Navigation in Dense Urban Environments

Wed, 16 Oct 2024 00:00:00 +0000

Model the Ionospheric Gradients Between Satellites in Network RTK

Wed, 09 Oct 2024 00:00:00 +0000

Adaptive Jamming Mitigation in Single-Antenna Receivers With Spectral Analysis and Switchable Filtering

Tue, 01 Oct 2024 00:00:00 +0000

AI Foundation Models Facilitate Real-time Global GNSS Precipitable Water Vapor Retrieval with Sub-millimeter Accuracy

Fri, 12 Jul 2024 00:00:00 +0000

Equalization of Frequency Domain Adaptive Filter (FDAF) Using Signal Prediction Aided Reference Spectrum Model (SPRSM)

Mon, 01 Jan 2024 00:00:00 +0000

Absolute and relative POD of LEO satellites in formation flying: Undifferenced and uncombined approach

Fri, 19 May 2023 00:00:00 +0000

Undifferenced and uncombined GNSS time and frequency transfer with integer ambiguity resolution

Mon, 06 Feb 2023 00:00:00 +0000

A method of real-time long-baseline time transfer based on the PPP-RTK

Sun, 01 Jan 2023 00:00:00 +0000

On the potential of undifferenced and uncombined GNSS time and frequency transfer with integer ambiguity resolution and satellite clocks estimated

Sun, 01 Jan 2023 00:00:00 +0000

RTK positioning performance analysis for combined BDS-3 and Galileo

Sun, 01 Jan 2023 00:00:00 +0000

Undifferenced and Uncombined GNSS Time Transfer and its Space Applications

Sun, 01 Jan 2023 00:00:00 +0000

Contact

Mon, 24 Oct 2022 00:00:00 +0000

People

Mon, 24 Oct 2022 00:00:00 +0000

Characteristics of the short-term temporal variations of multi-constellation and multi-frequency GNSS receiver differential phase biases

Fri, 01 Oct 2021 00:00:00 +0000

Characteristics of receiver-related biases between BDS-3 and BDS-2 for five frequencies including inter-system biases, differential code biases, and differential phase biases

Wed, 16 Jun 2021 00:00:00 +0000

Multi-GNSS RTK positioning with integer ambiguity resolution: from double-differenced to single-differenced

Fri, 01 Jan 2021 00:00:00 +0000

On the temperature sensitivity of multi-GNSS intra- and inter-system biases and the impact on RTK positioning

Mon, 17 Aug 2020 00:00:00 +0000

Characteristics of GPS, BDS2, BDS3 and Galileo inter-system biases and their influence on RTK positioning

Wed, 01 Jan 2020 00:00:00 +0000

Initial assessment of single- and dual-frequency BDS-3 RTK positioning

Wed, 01 Jan 2020 00:00:00 +0000

Stochastic modeling of between-receiver single-differenced ionospheric delays and its application to medium baseline RTK positioning

Sun, 01 Sep 2019 00:00:00 +0000

Multi-GNSS inter-system biases: estimability analysis and impact on RTK positioning

Wed, 05 Jun 2019 00:00:00 +0000

Mon, 01 Jan 0001 00:00:00 +0000

Xiaolong Mi Google Scholar 公开文献下载结果

来源：Google Scholar 个人主页的 Public access 列表。 Google Scholar 标为可公开访问：21 篇；本次成功取得 PDF：18 篇。

年份	结果	文献	来源/说明
2020	已存在	Initial assessment of single-and dual-frequency BDS-3 RTK positioning
2019	已存在	Multi-GNSS inter-system biases: estimability analysis and impact on RTK positioning
2021	已存在	Characteristics of receiver-related biases between BDS-3 and BDS-2 for five frequencies including inter-system biases, differential code biases, and differential phase biases
2020	已存在	On the temperature sensitivity of multi-GNSS intra-and inter-system biases and the impact on RTK positioning
2023	已存在	Undifferenced and uncombined GNSS time and frequency transfer with integer ambiguity resolution
2020	已存在	Characteristics of GPS, BDS2, BDS3 and Galileo inter-system biases and their influence on RTK positioning
2024	已存在	Tightly coupled bluetooth enhanced GNSS/PDR system for pedestrian navigation in dense urban environments
2023	未下载	A method of real-time long-baseline time transfer based on the PPP-RTK	https://curate.curtin.edu.au/ndownloader/files/62797006 (not PDF); https://espace.curtin.edu.au/bitstream/handle/20.500.11937/93506/93330.pdf?sequence=2&isAllowed=y (not PDF); https://www.sciencedirect.com/science/article/pii/S0273117722010006/pdfft?download=true (curl failed: curl: (22) The requested URL returned error: 403)
2024	已存在	Forecasting of tropospheric delay using AI foundation models in support of microwave remote sensing
2023	已存在	On the potential of undifferenced and uncombined GNSS time and frequency transfer with integer ambiguity resolution and satellite clocks estimated
2025	已存在	Spatiotemporal inhomogeneity of accuracy degradation in AI weather forecast foundation models: A GNSS perspective
2025	已存在	A combination of classification robust adaptive Kalman filter with PPP-RTK to improve fault detection for integrity monitoring of autonomous vehicles
2025	已存在	A new high-precision short-term ionospheric TEC prediction model based on the DBO-BiLSTM algorithm: A case study of Europe
2023	未下载	Absolute and relative POD of LEO satellites in formation flying: Undifferenced and uncombined approach	https://curate.curtin.edu.au/ndownloader/files/62795761 (not PDF); https://espace.curtin.edu.au/bitstream/handle/20.500.11937/92326/92150.pdf?sequence=3&isAllowed=y (not PDF); https://www.sciencedirect.com/science/article/pii/S0273117723003800/pdfft?download=true (curl failed: curl: (22) The requested URL returned error: 403)
2025	已存在	Accurately Extraction of Ocean Tidal Constituents from Coastal Satellite Altimeter Records
2025	已存在	Multi-Epoch Grid-Based 3DMA Positioning in Dense Urban Canyons by Optimizing Reflection Modelling
2024	未下载	AI Foundation Models Facilitate Real-time Global GNSS Precipitable Water Vapor Retrieval with Sub-millimeter Accuracy	https://www.authorea.com/doi/pdf/10.22541/essoar.172081357.72805131 (not PDF); https://authorea.com/doi/pdf/10.22541/essoar.172081357.72805131 (not PDF); https://d197for5662m48.cloudfront.net/documents/publicationstatus/212945/preprint_pdf/d01df236958684bf6ea9bfc5e3e2f0ae.pdf (curl failed: curl: (6) Could not resolve host: d197for5662m48.cloudfront.net); https://essopenarchive.org/doi/pdf/10.22541/essoar.172081357.72805131 (not PDF)
2025	已存在	A novel network RTK technique for mobile platforms: Extending high-precision positioning to offshore environments
2025	已存在	A novel optimized hybrid VMD-PCA-XGBoost model for forecasting precipitation: Exemplified by the Beijing-Tianjin-Hebei study region in China
2025	已存在	Array-Aided GNSS for Precise Determination of Ionospheric and Tropospheric Delays with Integer Ambiguity Resolution
2025	已存在	Evaluation and analysis of the precipitable water vapor in Inner Mongolia of China