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Method of remotely estimating a rest or best lock frequency of a local station receiver using telemetry

a remote estimation and local station technology, applied in the field of remote receivers and control stations, can solve the problems of large uplink signal acquisition time and typically uncertain blf, and achieve the effect of quick establishment of receiver locks and improving the use of costly ground station tim

Inactive Publication Date: 2007-05-03
THE JOHN HOPKINS UNIV SCHOOL OF MEDICINE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

Enables remote monitoring of the BLF for efficient frequency sweep and accurate determination of the uplink frequency, reducing acquisition time and maintaining frequency lock in the presence of Doppler shifts without ground-based Doppler measurements.

Problems solved by technology

However, the BLF is typically uncertain, i.e., not precisely known.
The larger the BLF uncertainty, the larger the uplink frequency sweep range, and disadvantageously, the larger the uplink signal acquisition time.

Method used

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  • Method of remotely estimating a rest or best lock frequency of a local station receiver using telemetry
  • Method of remotely estimating a rest or best lock frequency of a local station receiver using telemetry
  • Method of remotely estimating a rest or best lock frequency of a local station receiver using telemetry

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Embodiment Construction

Definition

[0026] The term “receiver frequency” used herein denotes a frequency fu, at which a receiver operates, and can mean either (i) an uplink frequency when an uplink frequency is present and the receiver is in the locked state, or alternatively, (ii) a rest frequency or BLF of the receiver when the receiver is unlocked, e.g., when the uplink frequency is not present.

System

[0027]FIG. 1 is a block diagram of an example system 100 in which the present invention can operate. In a first operational arrangement of system 100, depicted in FIG. 1, a ground station 102 transmits an uplink signal 104 to a spacecraft 106, such as a satellite, for example. Spacecraft 106 transmits a downlink signal 108 to ground station 102. Relative motion between ground station 102 and spacecraft 106 will typically cause Doppler shifts in uplink signal 104 and downlink signal 108, as would be apparent to one having ordinary skill in the relevant art(s). Thus, uplink signal 104 has a frequency ft at...

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Abstract

A system includes a remote station and a local station having a receiver. The receiver operates in an unlocked state corresponding to its best lock frequency (BLF). The local station derives data indicative of a ratio of the BLF to a reference frequency of the receiver, and telemeters the data to the remote station. The remote station estimates the BLF based on (i) the telemetered data, and (ii) a predetermined estimate of the reference frequency.

Description

CROSS REFERENCE TO RELATED APPLICATIONS [0001] This application claims the benefit U.S. Provisional Application No. 60 / 434,259, filed on Dec. 18, 2002, the contents of which are incorporated herein by reference in their entirety.BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The present invention relates generally to systems including a control station and a remote receiver, and more specifically, to such a system wherein the control station remotely monitors an operating frequency of the receiver using telemetry. [0004] 2. Discussion of the Related Art [0005] In a typical satellite system, a ground station transmits an uplink signal to a satellite and the satellite transmits a downlink signal to the ground station. The satellite includes a receiver configured to phase and / or frequency track the uplink signal. That is, in the presence of the uplink signal, the receiver locks onto and tracks the uplink signal frequency (referred to as the uplink frequency) and / or...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H04B17/02H04B1/06H04B17/40
CPCH04Q9/00
Inventor FIELHAUER, KARL B.JENSEN, JAMES R.
Owner THE JOHN HOPKINS UNIV SCHOOL OF MEDICINE