The Design of GPS Digital IF Signal Simulator

2012 ◽  
Vol 490-495 ◽  
pp. 1631-1635
Author(s):  
Bei Zhang
Keyword(s):  
Carrier Phase ◽  
Sampling Rate ◽  
Intermediate Frequency ◽  
Propagation Delay ◽  
Ionospheric Model ◽  
Research Development ◽  
Matlab Simulation ◽  
Gps Navigation ◽  
Matlab Implementation ◽  
Gps System

This paper focuses on the study of digital IF signal simulator's Matlab implementation on the basis of GPS system and GPS navigation signal simulator.It includes the simulator's parameter settings (such as the sampling rate,intermediate frequency), then calculates the sampling signal's code phase and carrier phase by determining the signal's propagation delay. In addition,it introduces and simulates the ionospheric model and the tropospheric model,and corrects the sampling signal's code phase and carrier phase.This paper realizes GPS digital IF signal simulator's Matlab simulation,thus it provides the supporting platform for research,development and testing of the GPS receiver's new algorithm

Accuracy of Static Differential GPS Techniques; Implications for Structural Deformation Monitoring

2009 ◽  
Vol 62-64 ◽  
pp. 31-38
Author(s):  
J.O. Ehiorobo
Keyword(s):  
Carrier Phase ◽  
Reference Frames ◽  
Phase Measurement ◽  
Sampling Rate ◽  
Tall Buildings ◽  
Deformation Monitoring ◽  
Structural Deformation ◽  
Control Network ◽  
Differential Gps ◽  
Engineering Structures

In recent years, the need to monitor for Deformation in Engineering Structures such as Dams, Bridges and Tall buildings have become more necessary as a result of reported failures of many of these structures with catastrophic consequences globally. Global Positioning System (GPS) is highly automated and less labour intensive than other conventional techniques used in structural deformation monitoring. For most applications, such as National Geodetic Control Network, Urban Control Network and other Engineering Control Network, an accuracy in the cm level for most GPS work is quite adequate. For Structural deformation monitoring however, the required accuracy is in millimeters. In this paper, the use of Static Differential GPS method with multiple receivers for high precision measurement was investigated using the monitoring Stations at Ikpoba Dam as case study Scenerio. Four units of LEICA 300 Dual Frequency GPS receivers were deployed for code and carrier phase measurements with observation session of 1hr at a sampling rate of 15 sec. Baseline Processing and Least Squares Adjustment of observation was carried out in WGS 84 and NTM reference frames using the LEICA SKI-PRO Processing software and Move. Analysis of the results revealed that the number of outliers in the observation were <5% and the accuracy of horizontal and vertical coordinates were 4mm maximum for horizontal and 2mm maximum for vertical. The study revealed that in areas with favourable satellite constellation and appropriate reduction or elimination of multipath and other noise like errors, Static Differential GPS techniques with a combination of code and carrier phase measurement gives good results for structural deformation monitoring.

ACCURATE ANALYTICAL MODELING OF FREQUENCY DEPENDENT LOOP SELF-INDUCTANCE

2008 ◽  
Vol 17 (01) ◽  
pp. 77-93
Author(s):  
MOSIN MONDAL ◽  
YEHIA MASSOUD
Keyword(s):  
Integrated Circuits ◽  
Frequency Dependence ◽  
Intermediate Frequency ◽  
Propagation Delay ◽  
Computationally Efficient ◽  
Frequency Dependent ◽  
Wide Range ◽  
Global Interconnects ◽  
Very High Frequencies

Parasitic inductance of global interconnects has gained much attention in the recent past since the inductance can no longer be neglected due to different design and fabrication issues. This has led to a paradigm shift from RC to RLC modeling of global interconnects in modern integrated circuits. However, the extraction of inductance is often expensive and presents a bottleneck in performing RLC analysis of interconnects. Unlike capacitance, the frequency dependence of current distribution through return paths present a major challenge in inductance extraction. In this paper, an efficient analytical model of frequency dependent self-inductance that can be applied to model a wide range of real design scenarios was presented. The model is based on the determination of the inductances at low and very high frequencies, an intermediate frequency point and the corresponding slope of the inductance frequency response. It is demonstrate that the approach is computationally efficient and it produces accurate values of frequency dependent inductance. It is also investigate how the frequency dependence of loop self-inductance affects the RLC delay and show that the pessimism in RLC propagation delay estimation could be as high as 49% if the frequency dependence of inductance is not considered properly. Thus, realistic (less pessimistic) delay values can be obtained using our model, leading to improved system performance.

scholarly journals Methods of precise aircraft positioning in the GPS system with an application of the troposphere correction

2020 ◽  
Vol 109 ◽  
pp. 73-84
Author(s):  
Małgorzata KIRSCHENSTEIN ◽  
Kamil KRASUSKI ◽  
Artur GOŚ
Keyword(s):  
Observation Data ◽  
Reference Solution ◽  
Statistical Measure ◽  
Positioning Accuracy ◽  
Navigation Data ◽  
Gps Navigation ◽  
Aircraft Navigation ◽  
Gps System ◽  
Made In

This article presents the results of studies concerning the designation of accuracy in aircraft navigation positioning by means of the SPP and the SBAS code methods. The examination of the aircraft positioning accuracy was made in the aspect of the use of tropospheric correction in observation equations of the SPP and the SBAS positioning methods. The accuracy of the coordinates of the aircraft in the SPP and the SBAS solutions was referenced to the DGPS reference solution. The investigations were conducted on raw observation data and GPS navigation data in an air test in Dęblin. Based on the conducted calculations, it was proved that the lack of use of tropospheric correction in the SPP method causes an error in an aircraft position up to 18.5 m, and in the SBAS method up to 23.2 m. In addition, the statistical measure of RMS accuracy in the absence of applying the tropospheric correction in the SPP method results in an accuracy decrease to 8.6 m, and in the SBAS method to 12.2 m, accordingly.

A digital correlation receiver for the Mingantu Spectral Radioheliograph

2019 ◽  
Vol 36 ◽  
Author(s):  
Fei Liu ◽  
Yihua Yan ◽  
Wei Wang ◽  
Baolin Tan ◽  
Linjie Chen ◽  
...  
Keyword(s):  
High Speed ◽  
Sampling Rate ◽  
Resolution Enhancement ◽  
Digital Signal ◽  
Wide Band ◽  
Intermediate Frequency ◽  
Radio Frequency Interference ◽  
Polyphase Filter ◽  
Digital Correlation ◽  
Correlation Receiver

Abstract We have designed and developed the digital correlation receiver for Mingantu Spectral Radioheliograph (MUSER). The MUSER digital correlation receiver is implemented to sample, channelise, and correlate a 400 MHz wide solar radio signal of 40-antenna output from MUSER intermediate-frequency array and 60-antenna output from MUSER high-frequency array. The polyphase filter channeliser is used for wide-band channelisation and proved to be efficient to realise narrow-band filtering ( ${\sim}25$ MHz) in a high-speed digital signal-processing pipeline (sampling rate ${\sim}1$ Gsps). All modules of the digital correlation receiver are implemented on FPGA-based hardware and integrated via high-speed backplane, which makes a well-performed and economical correlator system for MUSER array. The future upgrade is also addressed including spectral resolution enhancement and radio-frequency-interference excision.

GPS Navigation: Combining Pseudorange with Continuous Carrier Phase Using a Kalman Filter

Navigation ◽  
1990 ◽  
Vol 37 (2) ◽  
pp. 181-296 ◽  
Author(s):  
PATRICK Y. C. HWANG ◽  
R. GROVER BROWN
Keyword(s):  
Kalman Filter ◽  
Carrier Phase ◽  
Gps Navigation

Integration of Beidou and GPS in Vessel Monitoring System

2013 ◽  
Vol 373-375 ◽  
pp. 1622-1625
Author(s):  
Ming Liu ◽  
Huan Zhang
Keyword(s):  
Monitoring System ◽  
Communication Technology ◽  
Global Positioning System ◽  
Gps Navigation ◽  
Short Messaging Service ◽  
Observation Network ◽  
Global Positioning ◽  
Satellite Visibility ◽  
Novel Method ◽  
Gps System

A novel method has been proposed for integrated Beidou and GPS (Global Positioning System) navigation system in vessel monitoring system. Application of integrated Beidou and GPS navigation system's high precision positioning and SMS (Short Messaging Service) communication technology in vessel can well solve the problem of vessel navigation, positioning, remote monitoring and commanding. Based on 27 stations of Crustal Moment Observation Network of China, satellite visibility and availability of integrated Beidou and GPS are calculated and analyzed in detail. A data compression algorithm is proposed for Beidou SMS communication technology to get the continuous location and other state of the target vessel. Experimental results reveal that the integrated Beidou and GPS system is superior to any single system in all respects of positioning performance.

scholarly journals Motion Compensation for Radar Terrain Imaging Based on INS/GPS System

Sensors ◽  
2019 ◽  
Vol 19 (18) ◽  
pp. 3895 ◽  
Author(s):  
Michal Labowski ◽  
Piotr Kaniewski ◽  
Piotr Serafin
Keyword(s):  
Global Positioning System ◽  
Motion Compensation ◽  
Navigation System ◽  
Imaging System ◽  
Radar Images ◽  
Gps Navigation ◽  
System A ◽  
Global Positioning ◽  
Kalman Filter Algorithm ◽  
Gps System

In order to obtain good quality radar terrain images using an aerial-based synthetic aperture radar, a motion compensation procedure must be applied. This procedure can use a precise navigation system in order to determine the aircraft’s position and velocity. A major challenge is to design a motion compensation procedure that can operate in real time, which is crucial to ensure convenient data for a human analyst. The article discusses a possibility of Inertial Measurement System (INS)/Global Positioning System (GPS) navigation system usage in such a radar imaging system. A Kalman filter algorithm designed for this system is described herein, and its modifications introduced by the authors allow the use of navigational data not aligned in time and captured with different frequencies. The presented navigation system was tested using measured data. Radar images obtained with the INS/GPS-based motion compensation system were compared to the INS-only results and images obtained without navigation corrections. The evaluation results presented in the paper show that the INS/GPS system allows for better reduction of geometric distortions in images compared to the INS-based approach, which makes it more suitable for typical applications.

Design and Implementation of Dual-Channel and Dual-Mode Timing Module Based on Beidou & GPS

2012 ◽  
Vol 241-244 ◽  
pp. 2402-2406
Author(s):  
Xiao Shan Pan ◽  
Zi Guan Zhou ◽  
Min Zhou ◽  
Bing Qi
Keyword(s):  
Satellite System ◽  
Navigation Satellite ◽  
Dual Mode ◽  
Service Demand ◽  
Gps Navigation ◽  
Beidou Navigation Satellite System ◽  
Dual Channel ◽  
The Status ◽  
Baseband Processor ◽  
Gps System

Against the Status quo that satellite timing service in many fields of China mainly relies on the GPS system, for full use of the Beidou navigation satellite system with our own intellectual property, this paper presented a chip-level solution of dual-channel and dual-mode timing modules based on the Beidou-2 and GPS navigation system. The timing principle of Beidou navigation satellite system was first introduced, and then the hardware design of the timing module was presented with selection of highly-integrated RF chip and baseband processor chip. Furthermore, many kinds of output interfaces were designed to meet diverse service demand. By analyzing the format of the received signal, the flow chart for extracting timing information was also given. Finally, the designed timing module was tested by using the developed timing display system and test results show that the module has a better timing performance.

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