US 10,379,216 B2Granted

Positioning system

AssigneeMurata Manufacturing Co., Ltd.

InventorsKoichi Takizawa, Yoshiharu Yoshii, Yoshiyuki Tokiwa

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Abstract

A measurement apparatus outputs from a first antenna pair transmission signals (St11) and (St12) whose phase difference (Δϕ1) changes over time. A target object simultaneously receives the transmission signals (St11) and (St12) from a target-side antenna and returns to the measurement apparatus information (Dϕ) according to the positional relationship between the target object and the measurement apparatus determined from a reception signal (Sr1). The measurement apparatus outputs from a second antenna pair transmission signals (St21) and (St22) whose phase difference (Δϕ2) changes over time. The target object simultaneously receives the transmission signals (St21) and (St22) from the target-side antenna and returns to the measurement apparatus the information (Dϕ) corresponding to the positional relationship between the target object and the measurement apparatus determined from a reception signal (Sr2). The measurement apparatus identifies a direction (θ) of the target object on the basis of these two pieces of information (Dϕ).

Claims7

Dependent claims

A positioning system comprising:

an apparatus including a first antenna pair including two antenna elements, a second antenna pair including two antenna elements, and a signal generation circuit that generates transmission signals to be output from the antenna elements, wherein a distance between the two antenna elements of the first antenna pair and a distance between the two antenna elements of the second antenna pair are different from each other, the apparatus is configured to output different transmission signals from the two antenna elements of the first antenna pair and to output different transmission signals different from the two antenna elements of the second antenna pair;
and
a target object including a target-side antenna, a signal processing circuit that simultaneously receives from the target-side antenna two transmission signals transmitted from the apparatus and processes a reception signal, and a transmission circuit that returns a processed signal from the target-side antenna to the apparatus,
wherein a distance and a direction of the target object from the apparatus are detected by configuring the first antenna pair and the second antenna pair of the apparatus to operate alternately in time and by configuring the target object to transmit information processed by the signal processing circuit to the apparatus with a predetermined delay.

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 15/280,023Filed 29 Sep 2016 · continuation
Priority: JP 2014-07444931 Mar 2014
Published: US 2017/0016985 A119 Jan 2017
Granted: 13 Aug 2019
Term ends: Not estimatedThe source records don’t support an estimate.

Classification4 codes

G01S 13/84
Wherein continuous-type signals are transmitted: for distance determination by phase measurement
G01S 13/825
Wherein continuous-type signals are transmitted: with exchange of information between interrogator and responder
G01S 2013/0245
Special technical features: radar with phased array antenna
G01S
Radio direction-finding