Multi-satellite and Multi-Signal-to-Noise Ratio (SNR) types provide more basic data for the monitoring of sea level height by Global Navigation Satellite System Interferometric Reflectometry (GNSS-IR) technology. Few studies predict with high temporal resolution. This study proposes a theory based on GNSS-IR technology Auto Regressive Integrated Moving Average (ARIMA) model. Taking MAYG station as an example, process prediction determination best scheme are shown. First, monitored is...

Abstract With the rapid development of unmanned technology, AUVs equipped with side-scan sonar are playing an increasingly important role in underwater detection. The detection small targets such as mines, unexploded ordnance, and poles is currently focus research technology plays a vital role, especially military combat. However, existing methods rely too heavily on priori shadow information prone to missing many targets. Therefore, we propose weighted SSS patch-image model. method improved...

Abstract Despite advancements in global navigation satellite system/inertial system (GNSS/INS) integrated systems, the challenge of achieving rapid and accurate initial heading alignment remains, particularly low-grade IMUs marine applications with swaying conditions. This study introduces an innovative in-motion method utilizing time-differenced carrier phases (TDCP) from a single GNSS antenna IMU based on fundamental principle trajectory similarity. The angle is determined by comparing...

As an essential part of the global water cycle, effective detection snow depth is great significance to study climate change. Global Navigation Satellite System Interferometric Reflectometry (GNSS-IR) technology emerged as a new ground-based monitoring method. The principle invert height reflection surface according SNR at low elevation angle. However, topographic relief in area GNSS stations often dramatically impacts accuracy inversion. This proposes Terrain Tilt Correction (TTC) algorithm...

Currently, integrated navigation systems with the inertial system (INS)/geomagnetic (GNS) have been widely used in underwater of autonomous vehicle (AUV). Restricting AUV to navigate geomagnetic suitability areas (GSA) as far possible can effectively improve accuracy systems. In order classification GSA, a new optimal method based on principal component analysis (PCA) and improved back propagation (BP) neural network is proposed. PCA extract independent characteristic parameters containing...

Abstract Multisatellite systems and multi‐signal‐to‐noise ratio types provide a more prosperous data basis for the inversion of sea level by GNSS‐IR technology. However, there are few studies on reconstruction retrieved height. This study takes SPBY station as an example introduces least squares learning cross‐checking method with Gaussian kernel model (GKM) L2 constraint. Furthermore, research hourly based is carried out. Compared measured level, height in 2021 obtained after fusion...

Abstract With the aid of Doppler velocity logger (DVL), strapdown inertial navigation systems (SINSs) can provide continuous and accurate parameters for unmanned underwater vehicles (UUVs). However, owing to complex environment, partial DVL beams may fail be reflected by seafloor, resulting in measurement outage. In this study, a novel data-driven approach enhancing DVL/SINS integrated system is proposed improve robustness accuracy UUV with limited beams. First, make full use available beam,...

The tightly coupled global navigation satellite system (GNSS) precise point positioning (PPP) and inertial (INS) can provide high-precision position, velocity attitude information. utilizes single receiver, which is particularly suitable for the environment without reference station, such as marine survey. In former works, integer ambiguity resolution of PPP/INS in terrestrial researched. However, GNSS observation severely affected by multipath effect environment. addition, sideslip caused...

Integration of strapdown inertial navigation system (SINS) and doppler velocity log (DVL) is usually applied in underwater applications, wherein DVL provides the three-dimensional velocity, hence accumulated error SINS can be compensated. However, DVL/SINS loosely coupled approach fails complex environments on condition fewer than three available beams. And tightly divergences with only one direction information from beam measurement. To solve problems, a novel method proposed this paper,...

For the integrated system incorporating a low-cost inertial measurement unit (IMU) and global navigation satellite (GNSS), rapid accurate initial heading alignment is still significant challenge, especially for marine applications in challenging ocean conditions. To overcome this difficulty, we propose an in-motion coarse method using single-antenna GNSS low-grade IMU based on basic principle of trajectory similarity. The angle determined by dead reckoning (DR)-derived GNSS-derived gyro...