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DIFFERENTIAL TIME-OF-ARRIVAL MEASUREMENT SYSTEM

IP.com Disclosure Number: IPCOM000007156D
Original Publication Date: 1994-Feb-01
Included in the Prior Art Database: 2002-Feb-28
Document File: 2 page(s) / 86K

Publishing Venue

Motorola

Related People

J. L. Gross: AUTHOR [+2]

Abstract

This publication describes the determination of changes in the relative phase ofa transmitting source by utilizing the receivers optimum sampling point From a digital phase detector/integrator as phase information. This system is particularly useful in a burst mode satellite to satellite link where range rate information can be derived from relative prop- agation delay or differential time-of-arrival (DTOA) changes.

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MO-LA Technical Developments Volume 21 Februaw 1994

DIFFERENTIAL TIME-OF-ARRIVAL MEASUREMCNT SYSTEM

by J. L. Gross and C. G. Jones

  This publication describes the determination of changes in the relative phase ofa transmitting source by utilizing the receivers optimum sampling point From a digital phase detector/integrator as phase information. This system is particularly useful in a burst mode satellite to satellite link where range rate information can be derived from relative prop- agation delay or differential time-of-arrival (DTOA) changes.

  The problem involves determining the relative phase difference between two independent l?equency sources given the transmitted data at the receiver. Typical solutions to this problem use high speed digital clocks to provide a fine resolution DTOA measurement which requires additional complex cir- cuitry to compare the recovered clock with the local reference. This causes several undesirable effects such as increased hardware complexity and additional power dissipation. This problem can be simplified if the incoming data is sampled with a phase rotated version of the local receiver clock that is aligned with the incoming burst data. The solution presented here utilizes phase information from this data sam-

pling circuit to estimate relative phase changes nec- essary for range rate estimation.

  Figure 1 shows the general case where a clock n times the data rate is phase rotated by m discrete phase states by the analog phase r...