Acquisition Performance of Walsh-Hadamard Code Based Orthogonal Modulation Signal for Satellite Navigation Signal Applications

2018 ◽  
Vol 24 (2) ◽  
pp. 209-214
Author(s):  
Seung Tae Kim ◽  
Sung Chun Bu ◽  
Chul Soo Lee ◽  
Do Kyung Kim ◽  
Jae Min Ahn
Keyword(s):  
Satellite Navigation ◽  
Acquisition Performance ◽  
Navigation Signal ◽  
Modulation Signal ◽  
Hadamard Code ◽  
Orthogonal Modulation

IF Modulation in the Millimeter-Wave Transmitter End

2014 ◽  
Vol 926-930 ◽  
pp. 1810-1813
Author(s):  
Ming Xiao Ma
Keyword(s):  
Millimeter Wave ◽  
Frequency Converter ◽  
Digital Signal ◽  
System Structure ◽  
Interpolation Filter ◽  
Modulation Signal ◽  
Fpga Chip ◽  
Signal Output ◽  
Base Band ◽  
Orthogonal Modulation

This article describes a method of IF modulation used in millimeter-wave transmitter, the method is AD9857 combined with FPGA, choose the EP1C6 as a FPGA chip, and use this FPGA chip complete the base-band digital signal processing, and implement the control to the AD9857. AD9857 is a kind of the orthogonal frequency converter based on DDS technology, complete the functions of base-band digital signal interpolation filter, orthogonal modulation, and D/A conversion in the digital domain and complete QDPSK modulation signal output of 70MHz IF carrier. This method can eliminate phase and gain imbalances and distortion which caused by analog modulation, also can simplify the system structure, reduce cost and improve the performance and reliability of the system.

scholarly journals SIMULATION OF EGNOS SATELLITE NAVIGATION SIGNAL USAGE FOR AIRCRAFT LPV PRECISION INSTRUMENT APPROACH

Aviation ◽  
2021 ◽  
Vol 25 (3) ◽  
pp. 171-181
Author(s):  
Michal Hvezda
Keyword(s):  
Satellite Navigation ◽  
Positive Outcome ◽  
Statistical Characteristics ◽  
The Czech Republic ◽  
Navigation Data ◽  
Navigation Signal ◽  
Air Transport Industry ◽  
Satellite Signal ◽  
System Prototype ◽  
Specific Scenario

Satellite navigation has become a very important topic in the air transport industry along with its application in instrument approach procedures. Recently, extracted statistical characteristics of the European Geostationary Navigation Overlay Service (EGNOS) satellite signal have been made available from real measurements in the Czech Republic. The numerical modeling approach is taken for a feasibility study of automatic aircraft control during the Localizer Performance with Vertical Guidance (LPV) precision approach based on such navigation data. The model incorporates Kalman filtering of the stochastic navigation signal, feed-back control of L-410 aircraft dynamics and the calculation of approach progress along the predefined procedure. Evaluation of the performance of the system prototype is performed using the scenarios developed with a strong interest in altitude control. The specific scenario is focused on a curved approach which offers a huge advantage of the approaches based on the Satellite-based Augmentation System (SBAS) compared to ones with the Instrument Landing System (ILS). Outputs of simulation executions are statistically analyzed and assessed against predefined navigation performance goals equivalent to ILS categories with a positive outcome.

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