New wide-range fast-acting frequency tracking loop

A number of methods have been developed to enhance the robustness of Global Positioning System (GPS) receivers when there are a limited number of visible satellites. Vector tracking is one of them. It utilizes information from all channels to aid the processing of individual channels to generate receiver positions and velocities. This paper analyzes relationships among code phase, carrier frequency, and receiver position and velocity, and presents a vector loop-tracking algorithm using an Extended Kalman filter implemented in a Matlab-based GPS software receiver. Simulated GPS signals are generated to test the proposed vector tracking method. The results show that when some of the satellites are blocked, the vector tracking loop provides better carrier frequency tracking results for the blocked signals and produces more accurate navigation solutions compared with traditional scalar tracking loops.

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A 0.0056mm2 all-digital MDLL using edge re-extraction, dual-ring VCOs and a 0.3mW block-sharing frequency tracking loop achieving 292fsrms Jitter and −249dB FOM

2018 IEEE International Solid - State Circuits Conference - (ISSCC) ◽

10.1109/isscc.2018.8310212 ◽

2018 ◽

Cited By ~ 8

Author(s):

Shiheng Yang ◽

Jun Yin ◽

Pui-In Mak ◽

Rui P. Martins

Keyword(s):

Tracking Loop ◽

Frequency Tracking ◽

Dual Ring

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A 2.0–2.9 GHz ring-based injection-locked clock multiplier using a self-alignment frequency-tracking loop for reference spur reduction

Integration ◽

10.1016/j.vlsi.2021.12.007 ◽

2022 ◽

Author(s):

Rongjin Xu ◽

Dawei Ye ◽

C.-J. Richard Shi

Keyword(s):

Tracking Loop ◽

Frequency Tracking ◽

Reference Spur

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A 0.0056-mm2 −249-dB-FoM All-Digital MDLL Using a Block-Sharing Offset-Free Frequency-Tracking Loop and Dual Multiplexed-Ring VCOs

IEEE Journal of Solid-State Circuits ◽

10.1109/jssc.2018.2870551 ◽

2019 ◽

Vol 54 (1) ◽

pp. 88-98 ◽

Cited By ~ 4

Author(s):

Shiheng Yang ◽

Jun Yin ◽

Pui-In Mak ◽

Rui P. Martins

Keyword(s):

Tracking Loop ◽

Frequency Tracking

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A K-band CMOS Low-Phase-Noise Sub-harmonically Injection-Locked QVCO with Divider-less Frequency-tracking Loop

2019 IEEE MTT-S International Microwave Symposium (IMS) ◽

10.1109/mwsym.2019.8700923 ◽

2019 ◽

Cited By ~ 1

Author(s):

Han-Sen Yang ◽

Ian Yi-En Shen ◽

Hong-Yeh Chang

Keyword(s):

Phase Noise ◽

Tracking Loop ◽

Frequency Tracking ◽

Low Phase Noise ◽

K Band

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10.7 A 6.75-to-8.25GHz 2.25mW 190fsrms integrated-jitter PVT-insensitive injection-locked clock multiplier using all-digital continuous frequency-tracking loop in 65nm CMOS

2015 IEEE International Solid-State Circuits Conference - (ISSCC) Digest of Technical Papers ◽

10.1109/isscc.2015.7062989 ◽

2015 ◽

Cited By ~ 5

Author(s):

Ahmed Elkholy ◽

Mrunmay Talegaonkar ◽

Tejasvi Anand ◽

Pavan Kumar Hanumolu

Keyword(s):

Tracking Loop ◽

Frequency Tracking ◽

Continuous Frequency

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Reduced Harmonics Generated and Reactive Volt-Ampere absorption of HVDC Converter Using By-Pass Switch

WSEAS TRANSACTIONS ON SYSTEMS AND CONTROL ◽

10.37394/23203.2020.15.23 ◽

2020 ◽

Vol 15 ◽

Keyword(s):

Harmonic Generation ◽

Bridge Circuit ◽

Laboratory Model ◽

Three Phase ◽

Wide Range ◽

Tap Changer ◽

Predicted Values ◽

Load Tap Changer ◽

Fast Acting ◽

Secondary Winding

Control of a conventional converter station which uses a three-phase controlled bridge for converting AC to DC and vice-versa is achieved by fast-acting control of the valve firing angles. Tap-changers which are fitted on the converter transformer provide a near constant AC voltage input to the bridge to correct relatively slow changes of AC voltage. This paper describe a modification of the conventional bridge circuit, using by-pass valves connected to tapping points on the secondary winding of the transformer. This scheme permits a wide range of voltage control with a reduction in both the harmonic generation and the reactive voltampere absorption, and possibly eliminates the need for an on-load tap-changer on the converter transformer. Experimental results on a laboratory model compare well with the predicted values.

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