Abstract It is foreseeable that the BeiDou navigation satellite system with global coverage (BDS-3) and (regional) (BDS-2) will coexist in next decade. Care should be taken to minimize adverse impact of receiver-related biases, including inter-system biases (ISBs), differential code (DCB), phase (DPB) on positioning, navigation, timing (PNT) provided by systems (GNSS). Therefore, it important ascertain intrinsic characteristics especially context combination BDS-3 BDS-2, which have some...

Global Satellite Navigation System (GNSS) can't provide normal location service in the indoor environment because signal can be blocked by buildings. The pseudolites system supplement GNSS, especially environments. A new array is introduced, its multi-channel transmitter has an identical clock source. high-precision Doppler positioning method based on Z-fixed Known Point Initialization (Z-KPI) developed without ambiguity resolution. Some static and dynamic tests are conducted to evaluate...

This study presents a LiDAR-Visual-Inertial Odometry (LVIO) based on optimized visual point-line features, which can effectively compensate for the limitations of single sensor in real-time localization and mapping. Firstly, an improved line feature extraction scale space constraint matching strategy, using least square method, is proposed to provide richer front-end LVIO. Secondly, multi-frame LiDAR point clouds were projected into frame depth correlation. Thirdly, initial estimation...

A Global Satellite Navigation System (GNSS) cannot provide normal location services in an indoor environment because the signals are blocked by buildings. The Beidou satellite navigation system (BDS)/GPS array pseudolite is proposed to overcome problems of positioning with conventional pseudolite, such as time synchronization, ambiguity resolution and base stations. At same time, algorithm for Doppler differential improve accuracy coverage system, which uses difference equation Known Point...

In urban canyon environments, Global Navigation Satellite System (GNSS) satellites are heavily obstructed with frequent rise and fall severe multi-path errors induced by signal reflection, making it difficult to acquire precise, continuous, reliable positioning information. To meet imperative demands for high-precision of public users in complex like canyons, solve the problems GNSS/pseudolite under these circumstances, Precision Point Positioning (PPP) algorithm combined a pseudolite (PLS)...

In recent years, the research of indoor positioning technology has mainly focused on WI-FI, Bluetooth, ultra-wideband, and pseudo-satellites. Each these technologies different advantages, but also various limitations, especially in areas such as corridors, tunnels, stairs. Due to limitations application scenarios, navigation accuracy efficiency, it is difficult form a satisfactory solution for special environment. order solve problem long narrow areas, multi-source fusion algorithm based...

Global navigation satellite systems (GNSS) are usually unable to provide location-based service (LBS) in urban canyons, thus the pseudolite positioning system has become an important way enhance availability and accuracy of GNSS such environments. However, challenge traditional is time synchronization, which requires complex hardware visibility between pseudolites reference receiver. Thus, environment becomes very difficult complex. To solve this problem, a new asynchronous array proposed...

The location-based smartphone service brings new development opportunities for seamless indoor/outdoor positioning. However, in complex scenarios such as cities, tunnels, overpasses, forests, etc., using only GNSS on smartphones cannot provide stable and reliable positioning results. Usually, additional sensors are needed to assist GNSS. This paper investigates the algorithm assisted by pedestrian dead reckoning (PDR) scenarios. First, we introduce a step detection based peak–valley of...

The signals of navigation satellites are easily affected by spoofing interference, causing the wrong position, speed or Universal Time Coordinate receiver to be calculated. Traditional detection and suppression algorithms used only eliminate signals, which may lead an insufficient number for positioning. An adaptive algorithm (ASSA) based on a multiple antenna array is proposed in this study. ASSA can use cross-correlation gain adaptively generate nulling realize simultaneous signals....

Propagation path delays are a major error for the remote precise time transfer of common view; these contain ionosphere and troposphere impact, while contributions from common-view satellites to receivers on ground tend become uncorrelated when distance between increases. In order select appropriate ionospheric correction method view under different distances receivers, detailed test using multi-source data disturbances carried out in this paper. Here, we choose three disturbance methods...

With the development of Low Earth Orbit (LEO) communication constellations, it has become a hot area research to provide additional navigation augmentation services. Limited by volume, weight, power consumption, and running time, in-flight performance payload remains be investigated. In this paper, we analyze data quality on-board GNSS observation evaluate precision short-arc dynamic Precise Determination (POD) based on WangTong-01 (WT01) mission. Furthermore, downlink measurement WT01...

In terms of indoor and outdoor positioning, in recent years, researchers at home abroad have proposed some multisource integrated navigation positioning methods, but these methods are for a single scene. When it comes to the switching complex scenes, will cause results position with marked jump affect accuracy positioning. Aiming problem case scene switching, this paper proposes elastic method based on particle filters, which makes full use redundant information sensors, constructs an fusion...

This paper studied the problem of precise orbit determination by using GPS, SLR and DORIS, taken JASON-2 as example to discuss strategy, validating methods stacking it. Experiment has been carried out observational data from January 21st, 2009 25th, results show that: determined DORIS is best among that DORIS. Different method came a different conclusion on relative accuracy when comparing GPS When we combine DORS respectively weight based result overlap, it shows combined have similar...

The positioning performance of the Global Navigation Satellite System (GNSS) network real-time kinematic (NRTK) depends on regional atmospheric error modeling. Under normal conditions, NRTK provides high accuracy and rapid initialization. However, fluctuations in conditions can lead to poor modeling, resulting significant biases that affect accuracy, initialization speed, reliability positioning. Consequently, this decreases efficiency operations. In response these challenges, paper proposes...

High-precision navigation and positioning technology for indoor areas has become one of the research hotspots in current field. However, due to complexity environment, this direction is also difficulties. At present, our common methods are WIFI, Bluetooth, LED, ultrasound pseudo satellite. problem inaccurate direct or indirect ranging, accuracy usually affected, which makes final application difficult achieve. In order avoid ranging limitations existing methods, a new dual-frequency...

Due to large noise, severe multi-path error and frequent satellite of rise fall caused by propagation obstacle mirror material widespread in urban canyon with low-cost receiver, which was born low-power design restricted computing resource, the accuracy position normal RTK heavily reduced these large-biases observation un-continuous tracking satellites, therefore it is not applicable without optimization. Therefore C/N0-dependent exponential noise model for designed balance practical adopted...

Integer Aperture Bootstrapping (IAB) is a crucial method for testing ambiguity acceptance in carrier-phase differential global navigation satellite system (CDGNSS) positioning. It has the advantage that integrity parameters, such as failure rate, can be analytically calculated, which essential safety-of-life applications. Although IAB methods have been extensively studied, their threshold-determining still not well explained, theoretically. In this study, new method, named Analytical (AIAB),...