scholarly journals Probability-time Characteristics of GLONASS Navigation Signal Search

2017 ◽  
Vol 10 (4) ◽  
pp. 450-455
Author(s):  
Vladimir A. Mironov ◽  
◽  
Valeriy N. Tyapkin ◽  
Dmitry D. Dmitriev ◽  
Alexey V. Korovin ◽  
...  
Keyword(s):  
Navigation Signal ◽  
Signal Search

scholarly journals RADIO NAVIGATION SYSTEM BROADBAND SIGNAL SEARCH

2019 ◽  
pp. 66-74
Author(s):  
Aleksey S. Marugin ◽  
Vladimir K. Orlov ◽  
Rumiya R. Khaziakhmetova
Keyword(s):  
Search Time ◽  
Search Procedure ◽  
Worst Case ◽  
Modulation Formats ◽  
Long Baseline ◽  
Navigation Signal ◽  
Discrete Signals ◽  
Average Maximum ◽  
Shift Keying ◽  
Signal Search

The study object is the search procedure for a ground-based radionavigation system signal using noise-like discrete signals with a long baseline. A comparative analysis of the signal search quality indicators is carried out, which is the most time-consuming procedure with different navigation signal modulation formats in the worst-case conditions and with a limited frequency resource allocated to the system. Bandwidth efficiency of noise-like signals (NLS) with phase shift keying (PSK) and minimal frequency shift keying (MFSK) are analyzed. Relations are obtained for the average maximum search time of the navigation signal with a fixed probability of correct search completion. The qualitative indicators of the search procedure for PSK and MFSK are compared for the same band pass effectiveness and elementary symbol duration. The analysis results show that under the conditions of equal restrictions on the occupied frequency range and the same requirements for the search procedure reliability, NLS MFSK search is effective and implementable at much lower time costs than NLS with traditional binary PSK.

Study on Auto-Search Algorithm Based on Subsection Correlation for Loran-C

2012 ◽  
Vol 241-244 ◽  
pp. 1751-1755
Author(s):  
Yin Bing Zhu ◽  
Ke Jing Cao ◽  
Bao Li
Keyword(s):  
Signal Processing ◽  
Digital Signal Processing ◽  
Arrival Time ◽  
Search Algorithm ◽  
Digital Signal ◽  
Digital Processing ◽  
Digital Receiver ◽  
Maximum Correlation ◽  
Key Steps ◽  
Signal Search

Auto-search is one of the key steps in digital signal processing for Loran-C receivers, however, for digital sampling Loran-C signal, the principle search algorithm is unable to realize signal search veraciously because of the asynchronism between sampling clock and transmitting station clock. For this question, an auto-search algorithm based on subsection correlation for Loran-C is presented after analyzing the principle search algorithm. The experiment results show that for the received digital Loran-C signal, there are several correlation and accumulation values of master and secondary stations to exceed the search thresholds; the maximum correlation and accumulation value of the presented algorithm is far higher than that of the principle algorithm. That is to say, the presented algorithm can search the arrival time of master and secondary station successfully, solve the problem of clock asynchronism effectively, and enhance the search sensitivity of the receiver, which have great significance for digital processing of Loran-C signal and the engineering realization of Loran-C digital receiver.

A Terrestrial Digital Broadcasting and Positioning System Based on Overlap Communication

2014 ◽  
Vol 568-570 ◽  
pp. 1282-1286
Author(s):  
Guo Cheng Wu ◽  
Zhan Xin Yang ◽  
Wei Zhang Xu
Keyword(s):  
Communication Theory ◽  
Digital Transmission ◽  
Performance Degradation ◽  
Transmission System ◽  
Positioning System ◽  
Navigation Signal ◽  
Performance Deterioration ◽  
Digital Broadcasting ◽  
Simulation Results

Inspired by the overlap communication theory, a new onshore radio positioning system which superimposed on terrestrial digital transmission system is proposed in this paper. This system overlaps but not affects existing terrestrial digital broadcasting.At the receiver, a reconstruction/cancellation algorithm.is implied to capture the navigation signal and positioning measurements precisely.This paper focus on the construction of overlap system,spreading navigation signal and the capture of positioning measurements.We give a method to generate spreading navigation signal and overlap with terrestrial digital transmission system.The method can reduce the performance degradation due to pilot interference. We also proposes a reconstruction/cancellation algorithm which can solution the capture performance deterioration caused by overlapped system . The simulation results show that this system proposed in this paper can be used in terrestrial digital transmission system and provide good positional function.

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