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Method for solving two RF signals' angular position

a technology of angular position and rf signal, applied in the field of radar, can solve the problems of confusion in the sorting of each rf signal, adverse situations, etc., and achieve the effect of simple yet highly effective methods

Inactive Publication Date: 2008-02-07
THE UNITED STATES OF AMERICA AS REPRESENTED BY THE SECRETARY OF THE NAVY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

Enables simultaneous calculation of both RF signals' angles, improving accuracy and robustness against dominance and environmental interference, allowing for precise tracking of multiple targets.

Problems solved by technology

Further, since only one of the two RF signals is visible during any given time period, two types of adverse situations can occur with present angle processing techniques.
Second, the sorting of each RF signal can be confused by environmental angle disturbances.

Method used

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  • Method for solving two RF signals' angular position
  • Method for solving two RF signals' angular position
  • Method for solving two RF signals' angular position

Examples

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Embodiment Construction

[0017]Referring first to FIGS. 1, 2 and 3, FIG. 1 shows an angle plot for two RF signals over time which includes a composite angle obtained by adding two RF signals together. The plot identified by the reference numeral 20 is the composite angle for the two RF signals. The plot identified by the reference numeral 22 is the dominant RF signal's angle. The plot identified by the reference numeral 24 is the smaller RF signal's angle. FIG. 2 illustrates a composite power plot, identified by the reference numeral 26, for the RF signals over time.

[0018]FIG. 3 illustrates a period-averaged composite angle plot, identified by the reference 28, for the composite angle of the two RF signals over time. The period-averaged composite angle 28 of FIG. 3 is the dominant signal's angle over the time period of approximately one second and has a value of −0.15 degrees. It should be noted that the average of the period-averaged composite angle 28 of FIG. 3 is the same as the dominant signal's angle 2...

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Abstract

A method for determining an angle for each of two RF signals at different frequencies and offset from each other. The average angle of a composite signal is obtained from the two RF signals over a frequency difference period by averaging the frequency difference period. The average angle of the composite signal is the dominant signal's angle. The smaller signal's angle is then calculated from the dominant signal's angle, an angle centroid, and the signal voltages for the two RF signals.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates generally to radar used for tracking multiple targets. More specifically, the present invention relates to a method for solving for the angular position of two RF (radio frequency) signals.[0003]2. Description of the Prior Art[0004]Currently, military tracking radar is widely used to track targets and threats, such as enemy aircraft because of its high degree of accuracy and relative immunity to electronic countermeasures that can degrade tracking radar and their associated methods of tracking. Generally military tracking radar uses a single RF pulse to gather angle information, as opposed to directing multiple narrow-beam pulses in different directions and looking for a maximum return to identify the target.[0005]When there are two targets being tracked by radar, two RF signals at different frequencies are generated. The two RF signals produce a beat pattern in power return, with beats occ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G01S13/72G01S13/44
CPCG01S13/4418
Inventor WEATHERFORD, SHAUN DAVID
Owner THE UNITED STATES OF AMERICA AS REPRESENTED BY THE SECRETARY OF THE NAVY