Next Article in Journal
A Novel Technique for Fetal ECG Extraction Using Single-Channel Abdominal Recording
Previous Article in Journal
Phase Compensation Sensor for Ranging Consistency in Inter-Satellite Links of Navigation Constellation
Article Menu
Issue 3 (March) cover image

Export Article

Open AccessArticle
Sensors 2017, 17(3), 448;

Optimal Divergence-Free Hatch Filter for GNSS Single-Frequency Measurement

School of Aerospace Engineering, Sejong University, Seoul 05006, Korea
KASS (Korean SBAS) Development Team/Satellite Navigation Team, Korea Aerospace Research Institute, Daejeon 34133, Korea
Mechanical and System Design Engineering Department, Hongik University, Seoul 04066, Korea
Institute of Advanced Aerospace Technology, School of Mechanical and Aerospace Engineering, Seoul National University, Seoul 08826, Korea
Author to whom correspondence should be addressed.
Received: 13 December 2016 / Revised: 20 February 2017 / Accepted: 21 February 2017 / Published: 24 February 2017
(This article belongs to the Section Remote Sensors)
Full-Text   |   PDF [10717 KB, uploaded 24 February 2017]   |  


The Hatch filter is a code-smoothing technique that uses the variation of the carrier phase. It can effectively reduce the noise of a pseudo-range with a very simple filter construction, but it occasionally causes an ionosphere-induced error for low-lying satellites. Herein, we propose an optimal single-frequency (SF) divergence-free Hatch filter that uses a satellite-based augmentation system (SBAS) message to reduce the ionospheric divergence and applies the optimal smoothing constant for its smoothing window width. According to the data-processing results, the overall performance of the proposed filter is comparable to that of the dual frequency (DF) divergence-free Hatch filter. Moreover, it can reduce the horizontal error of 57 cm to 37 cm and improve the vertical accuracy of the conventional Hatch filter by 25%. Considering that SF receivers dominate the global navigation satellite system (GNSS) market and that most of these receivers include the SBAS function, the filter suggested in this paper is of great value in that it can make the differential GPS (DGPS) performance of the low-cost SF receivers comparable to that of DF receivers. View Full-Text
Keywords: GNSS; Hatch filter; divergence-free Hatch filter; smoothing window width; SBAS GNSS; Hatch filter; divergence-free Hatch filter; smoothing window width; SBAS

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

Park, B.; Lim, C.; Yun, Y.; Kim, E.; Kee, C. Optimal Divergence-Free Hatch Filter for GNSS Single-Frequency Measurement. Sensors 2017, 17, 448.

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