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Baidu Maps Tech Team
Baidu Maps Tech Team
Apr 22, 2026 · Industry Insights

How Beidou’s PPP‑RTK Transforms Global Centimeter‑Level Positioning

This article dissects Beidou’s star‑ground integrated PPP‑RTK system, comparing it with traditional RTK, detailing core technologies such as precise orbit/clock products, multi‑frequency bias correction, atmospheric modeling, trustworthy positioning, lightweight networking, and smart‑terminal phase solutions that together enable worldwide centimeter‑level navigation.

BeidouGNSSPPP-RTK
0 likes · 17 min read
How Beidou’s PPP‑RTK Transforms Global Centimeter‑Level Positioning
Model Perspective
Model Perspective
Dec 21, 2025 · Fundamentals

Why Did Nanjing’s GPS Fail? Unveiling the Math Behind Satellite Navigation

On December 17, 2025, a massive GNSS signal disruption in Nanjing caused major navigation apps to fail, prompting a technical analysis that reveals how trilateration, pseudorange measurements, linearization, least‑squares solving, and error factors like GDOP and carrier‑phase ambiguity underpin modern satellite positioning.

Carrier PhaseGDOPGNSS
0 likes · 9 min read
Why Did Nanjing’s GPS Fail? Unveiling the Math Behind Satellite Navigation
Baidu Maps Tech Team
Baidu Maps Tech Team
Oct 23, 2025 · Artificial Intelligence

How LightGBM Boosts Urban GNSS Accuracy by Detecting NLOS Errors

This article presents a reliable NLOS error identification method for GNSS in urban environments, combining fisheye camera and inertial navigation for objective labeling, extracting six signal features, and employing an optimized LightGBM classifier that achieves high precision and real‑time performance, markedly improving positioning accuracy.

GNSSLightGBMNLOS detection
0 likes · 15 min read
How LightGBM Boosts Urban GNSS Accuracy by Detecting NLOS Errors
HelloTech
HelloTech
Jun 6, 2024 · Mobile Development

Location Accuracy Issues and Optimization Strategies in Ride-Hailing Applications

The article examines ride‑hailing location failures—no fix and drift—explains Android vs iOS positioning, satellite and network sources, and presents a monitoring framework plus Wi‑Fi prompts and sensor‑fusion Kalman filtering that together reduce drift, improve accuracy, and boost order fulfillment.

GNSSKalman filterLocation Services
0 likes · 29 min read
Location Accuracy Issues and Optimization Strategies in Ride-Hailing Applications
Amap Tech
Amap Tech
Mar 2, 2022 · Fundamentals

Why GPS Signal Can Be Weak and How to Mitigate It

GPS signals can become weak due to tiny phone antennas and strong electromagnetic interference—especially in cars—plus device‑specific hardware limits, but moving the phone, waiting a few seconds, and relying on sensor fusion, network‑based positioning, and advanced decoding algorithms can substantially improve accuracy.

AntennaDesignGNSSGPS
0 likes · 8 min read
Why GPS Signal Can Be Weak and How to Mitigate It
Amap Tech
Amap Tech
Aug 18, 2021 · Fundamentals

Hardware Overview of High‑Precision Positioning and Orientation Systems

The article reviews the hardware of high‑precision positioning and orientation systems, explaining how GNSS and inertial measurement units (IMUs) are combined, describing sensor types, error sources, selection criteria, and testing methods needed to achieve centimeter‑level accuracy for mapping and mobility applications.

GNSSIMUhigh-precision positioning
0 likes · 25 min read
Hardware Overview of High‑Precision Positioning and Orientation Systems
Amap Tech
Amap Tech
Oct 30, 2020 · Fundamentals

Principles, Applications, and Future of Satellite Positioning (GNSS)

The article explains GNSS fundamentals—time‑signal ranging, ephemeris, and error sources—traces the evolution from early systems to modern constellations like Beidou, describes receiver components and mobile‑phone limitations, compares iOS and Android raw data access, and outlines future advances such as LEO constellations, RTK integration, and expanding precision‑positioning applications.

BeidouGNSSLocation Accuracy
0 likes · 21 min read
Principles, Applications, and Future of Satellite Positioning (GNSS)
DataFunTalk
DataFunTalk
Dec 3, 2019 · Artificial Intelligence

Hardware Technology Challenges and Solutions for Autonomous Driving

This article reviews the evolution of autonomous‑driving hardware, discusses key sensor technologies such as LiDAR and GNSS/IMU, outlines mechanical and electronic challenges—including size, weight, temperature, vibration, and electromagnetic interference—and presents Pony.ai’s PonyAlpha platform as a practical solution.

GNSSHardwarePonyAlpha
0 likes · 10 min read
Hardware Technology Challenges and Solutions for Autonomous Driving
Amap Tech
Amap Tech
Aug 13, 2019 · Artificial Intelligence

Multi‑Sensor Fusion Positioning for Vehicle Navigation: GPS/IMU/Map‑Matching Solution

Gaode's solution combines GPS, IMU, odometer, visual sensors with map‑matching using a Kalman filter, addressing yaw drift, loss of fix, and road‑capture errors in vehicle navigation, especially in urban canyons, achieving over 90% road identification and significant error reductions while keeping hardware costs low.

GNSSIMUKalman filter
0 likes · 16 min read
Multi‑Sensor Fusion Positioning for Vehicle Navigation: GPS/IMU/Map‑Matching Solution