Acquisition Algorithm for GPS L2C Signal on Dual-Frequency Navigation Receiver

2012 ◽  
Vol 457-458 ◽  
pp. 1413-1419
Author(s):  
Bing Hou ◽  
Xiao Lin Zhang ◽  
Peng Cheng Du ◽  
Zhu Feng Xu
Keyword(s):  
Doppler Shift ◽  
Experimental Result ◽  
Gps Receiver ◽  
Dual Frequency ◽  
Acquisition Process ◽  
Speed Up ◽  
Fixed Phase ◽  
L2c Signal ◽  
Phase Relationships

The newly broadcast GPS L2C signal will be extensively used due to its superiority. In order to acquire L2C signal fast in a dual-frequency GPS receiver, this paper firstly discusses two traditional acquisition algorithms, then proposes and implements a new algorithm based on the fixed phase relationships among C/A code, CM code and CL code and the fixed relationships of Doppler shift between the L1 channel and L2 channel. The experimental result demonstrates that the new acquisition algorithm can speed up the acquisition process substantially. It also suits other dual-frequency navigation receivers.

scholarly journals GPS Receiver Position Augmentation Using Correntropy Kalman Filter in Low Latitude Terrain

2022 ◽  
Author(s):  
Sirish Kumar Pagoti ◽  
Bala Sai Srilatha Indira Dutt Vemuri ◽  
Ganesh Laveti
Keyword(s):  
Kalman Filter ◽  
Indian Subcontinent ◽  
Estimation Algorithm ◽  
Position Estimation ◽  
Gps Receiver ◽  
Dual Frequency ◽  
Low Latitude ◽  
Position Accuracy ◽  
Aircraft Landing ◽  
Gps Accuracy

If any Global Positioning System (GPS) receiver is operated in low latitude regions or urban canyons, the visibility further reduces. These system constraints lead to many challenges in providing precise GPS position accuracy over the Indian subcontinent. As a result, the standalone GPS accuracy does not meet the aircraft landing requirements, such as Category I (CAT-I) Precision Approaches. However, the required accuracy can be achieved by augmenting the GPS. Among all these issues, the predominant factors that significantly influence the receiver position accuracy are selecting a user/receiver position estimation algorithm. In this article, a novel method is proposed based on correntropy and designated as Correntropy Kalman Filter (CKF) for precise GPS applications and GPS Aided Geosynchronous equatorial orbit Augmented Navigation (GAGAN) based aircraft landings over the low latitude Indian subcontinent. The real-world GPS data collected from a dual-frequency GPS receiver located in the southern region of the Indian subcontinent (IISc), Bangalore with Lat/Long: 13.021°N/ 77.5°E) is used for the performance evaluation of the proposed algorithm. Results prove that the proposed CKF algorithm exhibits significant improvement (up to 34%) in position estimation compared to the traditional Kalman Filter.

scholarly journals An autonomous adaptive low-power instrument platform (AAL-PIP) for remote high-latitude geospace data collection

2014 ◽  
Vol 3 (2) ◽  
pp. 211-227 ◽  
Author(s):  
C. R. Clauer ◽  
H. Kim ◽  
K. Deshpande ◽  
Z. Xu ◽  
D. Weimer ◽  
...  
Keyword(s):  
Low Power ◽  
Satellite Communication ◽  
Lessons Learned ◽  
Gps Receiver ◽  
Dual Frequency ◽  
Present Generation ◽  
Magnetic Meridian ◽  
Storage Batteries ◽  
The Antarctic ◽  
Small Team

Abstract. We present the development considerations and design for ground-based instrumentation that is being deployed on the East Antarctic Plateau along a 40° magnetic meridian chain to investigate interhemispheric magnetically conjugate geomagnetic coupling and other space-weather-related phenomena. The stations are magnetically conjugate to geomagnetic stations along the west coast of Greenland. The autonomous adaptive low-power instrument platforms being deployed in the Antarctic are designed to operate unattended in remote locations for at least 5 years. They utilize solar power and AGM storage batteries for power, two-way Iridium satellite communication for data acquisition and program/operation modification, support fluxgate and induction magnetometers as well as a dual-frequency GPS receiver and a high-frequency (HF) radio experiment. Size and weight considerations are considered to enable deployment by a small team using small aircraft. Considerable experience has been gained in the development and deployment of remote polar instrumentation that is reflected in the present generation of instrumentation discussed here. We conclude with the lessons learned from our experience in the design, deployment and operation of remote polar instrumentation.

A Speed-Up Way of Template Matching Using Normalized Cross-Correlation

2013 ◽  
Vol 313-314 ◽  
pp. 1188-1191 ◽  
Author(s):  
Fang Chen ◽  
Cun Ji Zhang ◽  
Bin Wen Zhao ◽  
Jin Fei Shi
Keyword(s):  
Template Matching ◽  
Cross Correlation ◽  
Correlation Method ◽  
Block Matching ◽  
Conventional Approach ◽  
Projection Algorithm ◽  
Experimental Result ◽  
Gray Scale ◽  
Normalized Cross Correlation ◽  
Speed Up

One classic algorithm usedin template matching is normalized cross correlation method. It often achieveshigh precision. But it does not meet speed requirements for time-criticalapplications. To solve that issue, a speed-up way of template matching isproposed. The fast matching way bases on pyramid hierarchical searchingalgorithm. It adopts two template matching methods to match images, which baseon rough matching proceeds local matching precision. Firstly, the coarsematching is performed based on gray-scale projection algorithm. Secondly, theprecise matching is made based on several small block matching. The new way iscompared to conventional approach without pyramid hierarchical searching byexperiments. Experimental result demonstrates that the proposed way efficientlyimproves the speed of template matching and the precision is unchanged.

Acquisition Algorithm for GPS L2C Signal on Dual-Frequency Navigation Receiver

2012 ◽  
Vol 457-458 ◽  
pp. 1413-1419
Author(s):  
Bing Hou ◽  
Xiao Lin Zhang ◽  
Peng Cheng Du ◽  
Zhu Feng Xu
Keyword(s):  
Dual Frequency ◽  
L2c Signal

Wave Heights during Hurricane Katrina: An Evaluation of PPP and PPK Measurements of the Vertical Displacement of the GPS Antenna

2010 ◽  
Vol 27 (10) ◽  
pp. 1760-1768 ◽  
Author(s):  
L. C. Bender ◽  
S. D. Howden ◽  
D. Dodd ◽  
N. L. Guinasso
Keyword(s):  
Hurricane Katrina ◽  
Degrees Of Freedom ◽  
Vertical Motion ◽  
Vertical Displacement ◽  
Water Levels ◽  
Gps Receiver ◽  
Dual Frequency ◽  
Wave Heights ◽  
6 Degrees Of Freedom ◽  
Gps Antenna

Abstract In August 2005 the eye of Hurricane Katrina passed 49 n mi to the west of a 3-m discus buoy operated by the Central Gulf of Mexico Ocean Observing System (CenGOOS). Buoy motions were measured with a strapped-down 6 degrees of freedom accelerometer, a three-axis magnetometer, and a survey-grade GPS receiver. The significant wave heights were computed from the buoy’s accelerometer record and from the dual-frequency GPS measurements that were processed in two different ways. The first method was postprocessed kinematic (PPK) GPS, which requires another GPS receiver at a fixed known location, and the other was precise point positioning (PPP) GPS, which is another postprocessed positioning technique that yields absolute rather than differential positions. Unlike inertial measurement units, either GPS technique can be used to obtain both waves and water levels. The purpose of this note is to demonstrate the excellent reliability and accuracy of both methods for determining wave heights and periods from a GPS record. When the motion of the GPS antenna is properly understood as the motion of the buoy deck and not the true vertical motion of the sea surface, the GPS wave heights are as reliable as a strapped-down 1D accelerometer.

scholarly journals Analysis of Tec Variations over Nepal Obtained from GPS Data on Geo-Magnetically Quiet and Disturbed Days of the Year 2015

2021 ◽  
Vol 7 (2) ◽  
pp. 102-109
Author(s):  
B. D. Ghimire ◽  
N. P. Chapagain ◽  
V. Basnet ◽  
B. Khadka
Keyword(s):  
Weather Prediction ◽  
Vapor Concentration ◽  
Gps Data ◽  
Electron Content ◽  
Gps Receiver ◽  
Dual Frequency ◽  
Total Electron ◽  
Gps Tec ◽  
Global Positioning ◽  
The Difference

Dual frequency Global Positioning System (GPS) receiver in two nearby stations i.e. BESI (28.228 °N, 84.739 °E) and GHER (28.375 °N, 84.739 °E) located at almost same latitude and longitude are used to measure ionospheric total electron content (TEC) for the year 2015. Since Year of 2014- 2016 have been known as most active years in terms of geomagnetic events, the year 2015 shows some abnormal results. Diurnal, monthly and seasonal variations of GPS TEC have been studied. The difference in the value of TEC is observed between quiet and disturbed days. Moreover, the correlation between GPS-data of each month with solar activities parameters such as Kp index, disturbance storm time (Dst) index, and Solar Flux index (F10.7 cm) have been studied, separately for quiet and disturbed days for each station. In case of diurnal variation, mean TEC varies from 0100 UT (LT= UT+5:45) to maximum from 0900 UT to 1100UT. The value of TEC is observed higher on quiet days than disturbed days. For seasonal variation, local seasons i.e. autumn, Spring, Summer and Winter is taken and, the value of TEC is found to be higher in Spring (March, April and May) in both stations in quiet and disturbed days. The difference in value of quiet and disturbed days of GPS-TEC explained the geomagnetic phenomena difference in these days in ionosphere. This study can be useful to calculate the water vapor concentration in the atmosphere which is useful for weather prediction and meteorological department.

Orbiting GPS Receiver Modified to Track New L2C Signal

2006 ◽  
Author(s):  
T.K. Meehan ◽  
D. Robison ◽  
T.N. Munson ◽  
L.E. Young ◽  
S. Stoyanov
Keyword(s):  
Gps Receiver ◽  
L2c Signal
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