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Device and method for distance measurement based on multi-band phase information of surface acoustic wave device

A surface acoustic wave device and phase information technology, applied in radio wave measurement systems, instruments, etc., can solve problems such as ambiguity and inaccurate distance measurement, achieve high-precision distance measurement, and solve the effects of inaccurate distance measurement

Active Publication Date: 2022-04-05
INST OF ACOUSTICS CHINESE ACAD OF SCI
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Problems solved by technology

[0013] Aiming at the deficiencies in the prior art, the present invention provides a ranging method combining the phase information of multi-frequency SAW devices, respectively measuring the phases of the SAW-RFID and the resonator located at the same position, performing addition and subtraction operations on the phases, and calculating The unambiguous phase at the new frequency can solve the problem of inaccurate ranging caused by 360° phase ambiguity, and realize high-precision distance measurement

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  • Device and method for distance measurement based on multi-band phase information of surface acoustic wave device

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Embodiment Construction

[0033] The distance measuring method of the present invention will be described in further detail below with reference to the drawings and embodiments.

[0034] In order to solve the 360° phase ambiguity problem, the phase quadratic phase difference method is adopted. That is: select 3 surface acoustic wave devices with different working center frequencies (not limited to 3, but more), where the three different center frequencies satisfy: f1figure 1 shown. The frequency f1 is small enough that the phase p1 has no 360° phase ambiguity, but its precision is very low, as figure 1 The dashed box at the bottom of is the fluctuation range. The other 2 phases have 360° phase blur. For phase p2, limited to the fluctuation range of phase p1, phase p2 has no 360° phase ambiguity, and the only N value in formula (4) can be obtained, and its accuracy is slightly improved, as figure 1 The dashed box in the middle shows its fluctuation range. Similar to phase p2, phase p3 is limited wit...

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Abstract

The invention discloses a distance measuring device and method based on multi-band phase information of a surface acoustic wave device, which is used for measuring the distance between a reader and a sensor probe. The sensor probe includes three surface acoustic wave devices: SAW-RFID chip A, SAW-RFID chip B and a surface acoustic wave resonator; the working frequency band of the SAW-RFID chip A is 2.4GHz to 2.44GHz, and the center frequency is 2.42GHz; the working frequency band of the SAW-RFID chip B is 2.44GHz to 2.48GHz GHz, the center frequency is 2.46GHz; the operating frequency band of the surface acoustic wave resonator is 420MHz to 440MHz, and the center frequency is 433MHz; the reader has a phase information acquisition method for three different center frequency devices. The method comprises: utilizing the characteristic that the center operating frequencies of the three surface acoustic wave devices constituting the sensor probe do not coincide, synthesizing the phase information of the surface acoustic wave sensor devices in three different frequency bands, and processing the phase information by using the quadratic phase difference method, This measures the distance between the reader and the sensor head. The method of the invention can realize high-precision distance measurement.

Description

technical field [0001] The invention relates to the technical field of surface acoustic wave sensors, in particular to a distance measuring device and method based on multi-band phase information of surface acoustic wave (SAW, Surface Acoustic Wave) devices. Background technique [0002] Wireless passive SAW-RFID integrates tags and sensors and has the following advantages: Since the surface acoustic wave sensor is composed of piezoelectric materials and does not contain semiconductor devices, it is a "coreless" device, so it only requires extremely low energy Can work, and then realize wireless passive. It relies on sound waves to work internally. Sound waves propagate on the chip surface with an accurate delay of ns level. The delay has an estimable and measurable change law, which can be distinguished from the delay of electromagnetic waves in space in theory. In the process of transmitting and receiving sensor echoes, by separating and accurately measuring the delay of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/539G01S7/526
CPCG01S7/539G01S7/526
Inventor 李红浪卢孜筱柯亚兵李鹏旭
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI
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