Reducing frequency offset within a EUROFIX receiver using asynchronous uniform sampled LORAN-C pulses

Reducing frequency offset within a EUROFIX receiver using asynchronous uniform sampled LORAN-C pulses

Huijsmans, R.P.

Van Willigen, D. (mentor)
Coenen, T. (mentor)

Electrical Engineering, Mathematics and Computer Science

Telecommunicatie- en Verkeersbegeleidingssystemen

1995-12

EUROFIX is a new proposed system in which the LORAN-C navigation system is altered slightly to transmit DGPS data. This system is tested at the Telecommunications and Traffic Control Systems Group by using an atomic clock for precision timing measurements. Within the EUROFIX project an investigation is conducted to see if groundwaves as well as skywaves can be used to decode DGPS information. To be able to detect and separate multiple skywaves from the groundwave, the sampled signal must first be ‘conditioned’ which implies the cleaning up of distorting effects. The first and most important distorting effect was found to be clock drift, when the atomic clock was not used for timing. The question arose if it were possible to measure clockdrift in the receiver by looking at the relative change of phase of successive LORAN-C pulses and to compensate for this drift without adjusting the actual timing of the A/D converter.

Interpolation filters
EUROFIX
Quadrature Bandpass sampling
Phase drift measurements
Digital Signal Processing

http://resolver.tudelft.nl/uuid:3f9662d2-38e5-4345-b364-c94c959256e5

Student theses

master thesis

(c) 1995 R.P. Huijsmans