Position information estimation device, method thereof, and program
A technology for position information and estimating signals, which is used in measurement devices, directional devices for determining direction, systems for determining direction or offset, etc., which can solve problems such as a large amount of calculation time.
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no. 1 example
[0089] In this first embodiment, the direction of the signal source or the direction of arrival of a source signal emanating from the signal source is determined.
[0090] FIG. 5 shows the functional configuration of the first embodiment, and FIG. 6 shows a partial flowchart of its processing procedure.
[0091] J sensors 1 equal in number to or greater than the number I of signal sources 1 ,1 2 ,...,1 J is arranged in figure 1 in the array shown. The spacing between adjacent sensors is usually equal to or less than half the shortest wavelength of the source signal. by sensor 1 j (j = 1, 2, ..., J) Observed signal x j (t) through the corresponding frequency domain transformer 11 j The short-time Fourier transform in is transformed into a frequency-domain signal X j (ω, m) (step S1, Fig. 6). For these frequency-domain signals X j (ω,m) for each angular frequency ω n The separation matrix W(ω n ) (n=1, 2, . . . , N) (step S2, FIG. 6 ).
[0092] W(ω)=(W(ω 1 ), W(ω ...
no. 2 example
[0118] The second embodiment is directed to obtaining direction information as an item of position information of a signal source. According to a second embodiment, at least three sensors arranged in at least two dimensions make it possible to estimate the direction of a signal source whenever it is oriented, thus making it possible to solve the permutation problem involving blind signal separation in a simpler way. Specifically, a cone surface based on the direction information is estimated, and a straight line below a plurality of cone surfaces is estimated to determine the direction information.
[0119] Fig. 12 shows the functional configuration of the second embodiment applied to the blind signal separation system, Figure 13 Shows the handler used therein. For example, four sensors 1 1 ,1 2 ,1 3 and 1 4 Arranged at equal intervals on a circle, the intervals are selected to be equal to or less than half the minimum wavelength of the source signal. In the ensuing des...
no. 3 example
[0158] In the third embodiment, a curved surface on which a signal source exists is used as position information based on a ratio of distances between a sensor pair and one single signal source. In the first and second embodiments, it is assumed that the signal source is remote from the sensor, so that the signal from said signal source reaches the sensor as a plane wave. However, when the distance between the signal source and the sensor is short, the signal reaches the sensor as a spherical wave. With this in mind, when interpreting the ratio A of the elements of the mixing matrix A(ω) in terms of the spherical wave (close field) model ji (ω) / A j′i When (ω), information other than the direction of the signal source can be estimated.
[0159] Specifically, using the close-field model, the frequency response A ji (ω) can be expressed as follows:
[0160] A ji (ω)=(1 / ‖q i -d j ‖)exp(jωc -1 (‖q i -d j ‖))
[0161] Among them, q j is a vector indicating the location o...
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