Design of signal acquisition and tracking process based on multi-thread for real-time GNSS software receiver

Park, Kwi Woo; Suh, Jae-Won; Seo, Bo-Seok; Lee, Min Joon; Park, Chan-Sik

doi:10.1109/icl-gnss.2016.7533688

Cited by 5 publications

(4 citation statements)

References 2 publications

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“…The code Doppler variation has a strict coupling relationship with the carrier Doppler, and errors can be suppressed through the Doppler offset provided by the carrier loop. Therefore, the dynamic stress error can be ignored, and only the ranging error caused by thermal noise is considered [33]. The PN code ranging error is (22).…”

Section: If Signal If Signal Down Convertermentioning

confidence: 99%

Carrier Phase Dual One-Way Ranging Method Based on a Frequency Hopping Signal

Zhang,

Feng,

Wang

et al. 2024

Remote Sensing

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With the development of navigation satellite constellation systems, to improve navigation service and orbit determination performance, the accuracy requirements for maintaining temporal references have increased rapidly. Among the current navigation satellites, a dual one-way ranging (DOWR) approach based on intersatellite links (ISLs) is widely adopted in the BeiDou system and global positioning system (GPS) to transmit satellite time reference information. However, the accuracy of DOWR is restricted by the pseudonoise (PN) code rate. To improve the accuracy of DOWR, the PN code measurement must be replaced by the carrier phase measurement. This paper introduces an algorithm that utilizes frequency hopping to achieve carrier phase ranging. In addition to the high-precision advantages of carrier phase measurements, the anti-interference performance of the ranging signal is also improved due to the characteristics of the frequency hopping signal itself. Ultimately, at a carrier-to-noise ratio of 40 dB-Hz, the measurement accuracy is 9.54 μm, while the PN code measurement accuracy in the same environment is 0.13 m. As the carrier-to-noise ratio increases, the measurement accuracy further improves.

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Section: If Signal If Signal Down Convertermentioning

confidence: 99%

Carrier Phase Dual One-Way Ranging Method Based on a Frequency Hopping Signal

Zhang,

Feng,

Wang

et al. 2024

Remote Sensing

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“…Global Navigation Satellite System (GNSS) adalah perangkat sensor yang dapat digunakan untuk menentukan posisi secara global. Sistem Satelit GNSS tidak mentransmisikan informasi posisi, tetapi yang ditransmisikan satelit adalah posisi satelit dan jarak penerima GNSS dari satelit [2]. Pada penelitian ini informasi posisi diolah oleh alat penerima Global Positioning System (GPS).…”

Section: Pendahuluan a Latar Belakangunclassified

Rancang Bangun Unmanned Surface Vehicle (USV) Dengan Sistem Navigasi Berbasis Kompas Dan Estimasi A-GPS

Triezani¹,

Jatmiko²

2021

Jurnal Ilmiah Telekomunikasi, Kendali dan Elektronika Terapan

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Abstrak – Di zaman sekarang telah hadir suatu sistem yang dinamakan Global Navigation Satellite System (GNSS) untuk mengestimasi posisi sebuah wahana autonomous. Namun pada kenyataannya penerima GNSS kerap mengalami gangguan yang berhubungan dengan akurasi dan kestabilan pembacaan dengan penyebab utama terhalangnya penerima GNSS oleh objek-objek seperti awan tebal, gedung-gedung atau posisi di dalam ruangan. Pada penelitian ini, sistem estimasi posisi dari wahana akan menggunakan pembacaan posisi melalui salah satu fitur dari GNSS yaitu Assisted Global Positioning System (A-GPS) yang ada pada smartphone. Dalam perancangannya, wahana akan menggunakan kompas sebagai penentu arah gerak agar dapat mencapai waypoint dengan akurat. Tujuan pada penelitian ini adalah merancang sistem navigasi yang mampu membuat wahana mencapai waypoint dengan tingkat keandalan yang lebih baik menggunakan kompas dan estimasi dari A-GPS. Metode yang digunakan dalam penelitian ini yaitu menguji wahana untuk mencapai waypoint menggunakan perhitungan jarak dan bearing antara posisi wahana saat ini dan tujuan lalu membandingkan hasil dari sistem estimasi A-GPS dengan Global Positioning System (GPS). Hasil dari penelitian ini didapatkan sistem navigasi wahana menggunakan A-GPS mampu menghasilkan estimasi posisi yang lebih baik dibandingkan GPS dengan tingkat akurasi mencapai 1 hingga 3 meter untuk navigasi secara keseluruhan atau dengan rata-rata 1,5 meter untuk waypoint yang tercapai oleh wahana ketika bernavigasi. Wahana juga teruji mampu menyesuaikan arah gerak menuju waypoint menggunakan sensor kompas dengan simpangan terjauh dari bearing tujuan sebesar 3o. Konsep dari penelitian ini berasal dari premis sistem A-GPSang telah terintegrasi pada smartphone untuk mendapatkan data posisi yang paling relevan tanpa perlu khawatir jika penerima GNSS terhalang oleh cuaca ataupun dalam posisi di dalam ruangan. Maka dari itu, dengan menggabungkan kedua sistem pembacaan tersebut, dapat menghasilkan estimasi posisi yang lebih baik sehingga dapat meningkatkan keandalan dari sebuha wahana untuk bernavigasi secara autonomous. Selain itu, impact penelitian ini juga dapat diterpakan dalam berbagai sistem salah satunya untuk navigasi wahana autonomous. Kata kunci : Autonomous, A-GPS, Kompas, Navigasi, Waypoint.

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“…This method is novel and based on statistical inference of the acquired GPS data, rather than developing and adapting an effective algorithm to the signal [ 6 , 7 , 8 , 9 , 10 ], as in the case of the a posteriori multipath estimator technique (APME) [ 11 ] developed by Septentrio. There are also several methods of position estimation based on data, but these are for waveforms data and are different from this proposed method [ 12 , 13 ]. Similarly, there is a method of location estimation using machine learning from a database, but this method is also performed on waveforms data and is different from our method [ 14 , 15 ].…”

Section: Introductionmentioning

confidence: 99%

High Precision Location Estimation in Mountainous Areas Using GPS

Kunisada¹,

Premachandra²

2022

Sensors

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Outdoor recreation has become popular in recent years, against the backdrop of the new coronavirus epidemic that started in 2020. Mountaineering, in particular, has become a popular pastime for many people as an easy way to experience nature. However, the number of mountaineering accidents is increasing, owing to the inadequate knowledge and equipment for beginners. In particular, the lack of map-reading skills and experience often leads to the selection of wrong trails. The smartphones used for precise location information obtain correction information from radio waves from a base station, and the accuracy of using only the GPS in mountainous areas without radio waves is questionable. In general, the GPS position correction methods in the literature for such situations include complex processing of the GPS radio waves. Some of these methods have been proposed with complex hardware and are difficult to implement with portable hardware. In this study, we develop and demonstrate a method for obtaining accurate location information using GPS without the error correction of radio waves, even in mountainous areas. The multipath is the reason for most of the GPS errors in the mountains. In the mountains, depending on the locations, the correct GPS location can also be received. In the proposed method, the correct GPS data are used to detect the incorrect GPS locations. We present an experimental method for estimating the interrelationship between the GPS longitude and latitude data. Additionally, we demonstrate the effectiveness of our method by showing that the experimental mountain location data presented in this paper are more accurate than the GPS data alone.

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Design of signal acquisition and tracking process based on multi-thread for real-time GNSS software receiver

Cited by 5 publications

References 2 publications

Carrier Phase Dual One-Way Ranging Method Based on a Frequency Hopping Signal

Carrier Phase Dual One-Way Ranging Method Based on a Frequency Hopping Signal

Rancang Bangun Unmanned Surface Vehicle (USV) Dengan Sistem Navigasi Berbasis Kompas Dan Estimasi A-GPS

High Precision Location Estimation in Mountainous Areas Using GPS

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