Next Article in Journal
Obstacle Detection as a Safety Alert in Augmented Reality Models by the Use of Deep Learning Techniques
Next Article in Special Issue
Lightweight Biometric Sensing for Walker Classification Using Narrowband RF Links
Previous Article in Journal
Mapping Sensory Spots for Moderate Temperatures on the Back of Hand
Previous Article in Special Issue
ECG Signal De-noising and Baseline Wander Correction Based on CEEMDAN and Wavelet Threshold
Article Menu
Issue 12 (December) cover image

Export Article

Open AccessArticle
Sensors 2017, 17(12), 2808;

Frequency-Locked Detector Threshold Setting Criteria Based on Mean-Time-To-Lose-Lock (MTLL) for GPS Receivers

School of Electronic and Information Engineering, Beihang University, Beijing 100191, China
School of Computer and Information, Hefei University of Technology, Hefei 230009, China
Guangxi Key Laboratory of Precision Navigation Technology and Application, Guilin 541004, China
Author to whom correspondence should be addressed.
Received: 17 October 2017 / Revised: 21 November 2017 / Accepted: 28 November 2017 / Published: 4 December 2017
(This article belongs to the Special Issue Sensor Signal and Information Processing)
Full-Text   |   PDF [3030 KB, uploaded 5 December 2017]   |  


Frequency-locked detector (FLD) has been widely utilized in tracking loops of Global Positioning System (GPS) receivers to indicate their locking status. The relation between FLD and lock status has been seldom discussed. The traditional PLL experience is not suitable for FLL. In this paper, the threshold setting criteria for frequency-locked detector in the GPS receiver has been proposed by analyzing statistical characteristic of FLD output. The approximate probability distribution of frequency-locked detector is theoretically derived by using a statistical approach, which reveals the relationship between probabilities of frequency-locked detector and the carrier-to-noise ratio (C/N0) of the received GPS signal. The relationship among mean-time-to-lose-lock (MTLL), detection threshold and lock probability related to C/N0 can be further discovered by utilizing this probability. Therefore, a theoretical basis for threshold setting criteria in frequency locked loops for GPS receivers is provided based on mean-time-to-lose-lock analysis. View Full-Text
Keywords: GPS receiver; frequency locked loop; frequency-locked detector; mean-time-to-lose-lock GPS receiver; frequency locked loop; frequency-locked detector; mean-time-to-lose-lock

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

Share & Cite This Article

MDPI and ACS Style

Jin, T.; Yuan, H.; Zhao, N.; Qin, H.; Sun, K.; Ji, Y. Frequency-Locked Detector Threshold Setting Criteria Based on Mean-Time-To-Lose-Lock (MTLL) for GPS Receivers. Sensors 2017, 17, 2808.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics



[Return to top]
Sensors EISSN 1424-8220 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top