Guidance by radio focusing

摘要

A method of guidance by radio focusing includes a “visitor” entity heading towards a radio source of number k=1 (or k=klast) by observing intensity of the radio source of number k=1 (or k=klast) as measured by an “Evisitor” communicating device carried by the visitor, until the visitor reaches the source of number k=1 (or k=klast). The visitor heads in succession for k=1, 2, . . . , klast-1 (or in reverse) from a radio source of number k towards a radio source of number (k+1) (or (k−1)) by observing intensity of the source (k+1) (or (k−1)), until the visitor reaches the source (k+1) (or (k−1)). Each radio source is a virtual radio source as produced by a respective signal k or by superposing a plurality of respective signals k. Each signal is transmitted by a respective communicating device ER.

主权项

1. A method of guidance by radio focusing, the method comprising the following steps:
a) an entity referred to as a “visitor” starts from a predetermined location and heads towards a radio source of number k=1 (or respectively k=klast) by observing an intensity of said radio source of number k=1 (or respectively k=klast) as measured by a communicating device referred to as “Evisitor” carried by said visitor, until the visitor has reached said source of number k=1 (or respectively k=klast); and b) said visitor heads in succession for k=1, 2, . . . , klast-1 (or respectively k=klast, klast-1, . . . , 2) from a radio source of number k towards a radio source of number (k+1) (or respectively (k−1)) by observing the intensity of said source of number (k+1) (or respectively (k−1)) as measured by said device Evisitor, until the visitor has reached the source of number (k+1) (or respectively (k−1)); wherein each of said radio sources of number k for k=1, . . . , klast is a virtual radio source referred to as a “spatiotemporal beacon”, as produced by a respective signal of number k or by superposing a plurality of respective signals of number k, each of these signals being transmitted by a respective communicating device ERi, where i=1, . . . , N and N≧1, said communicating devices ERi being placed at various locations in a predetermined environment, or in the vicinity of said environment, and wherein said respective signal of number k results from the time-reversal of a signal which was previously recorded by at least one of said devices ERi during a training stage, during which an entity referred to as a “guide” has passed through said environment along a certain path while provided with a communicating device Eguide transmitting successively, for each value of the number k going from k=1 to k=klast, a respective signal of number k.