Phase-shifting superposition anti-interference method of surface acoustic wave power temperature measurement collector

Abstract

The invention relates to a phase-shifted overlapping anti-interference method for an acoustic surface wave electric power temperature measurement collector. By the aid of the fixed phase relationship among transmitting signals and temperature measurement tag echo signals, radio-frequency signals are repeatedly transmitted, the phase of the transmitting signals is transformed by one fixed value every time, and the acquired echo signals are overlapped, energy of effective echo signals is improved, so that resistance to fixed interference of an acoustic surface wave electric power temperature measurement system is improved. The method includes the steps: 1) repeatedly transmitting the radio-frequency signals to a temperature measurement sensor on a tested device by a collector antenna for 64 times; 2) receiving the echo signals reflected by the acoustic surface wave temperature measurement sensor on the related tested device by the collector antenna; 3) processing the echo signals by a DSP (digital signal processor) control unit; 4) eliminating interference signals reflected by the DSP control unit, and reserving the echo signals of a normal resonator. The method has the advantages that the interference signals larger than normal signals are processed, the method is used for the field of radar navigation and detection, and the interference resistance of the system can be improved.

Description

technical field [0001] The present invention relates to electric power testing equipment, in particular to a phase-shifting superimposition anti-interference method for a surface acoustic wave power temperature measurement collector, using surface acoustic wave radio frequency identification technology (SAW-RFID) to monitor the temperature of power system-related equipment in the Internet of Things Test, and when using the frequency measurement method to measure temperature, anti-jamming technology is an important technology to enhance system stability. Background technique [0002] Using SAW-RFID (Surface Acoustic Wave Radio Frequency Identification Technology) to realize real-time monitoring of equipment during operation can provide technical support for power operation departments to predict failures, solve problems in advance, and avoid huge economic losses and casualties caused by failures. [0003] In the prior art, the method of using SAW-RFID temperature measuring eq...

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Problems solved by technology

[0004] However, if there is electromagnetic interference in the environmental space, it will often lead to inaccurate temperature measurement, or cannot continue to measure temperature well, and the existence of interference is an inevitable thing. How to continue to measure accurately in the presence of interference? Temperature is an important issue that needs to be solved in the field of SAW-RFID temperature measurement, especially in the case of co-frequency interference, how to carry out co-frequency anti-jamming or interference cancellation is the focus of this invention

[0005] In the past, the method of adopting anti-interference is: the energy of two echoes is subtracted, which cannot solve the problem of high-power or same-frequency interference.

Because in the amplitude subtraction of FFT, when the interference signal is larger than the echo signal, the weak signal is difficult to be detected correctly

[0006] In the Chinese patent CN103490830A, a method for obtaining the peak value of the radio frequency spectrum by denoising in the surface acoustic wave power temperature measuring equipment is proposed. This method is also a kind of anti-interference technology, but this solution cannot solve the problem of fixed interference on the equipment. Impact

Chinese patent CN103017940A proposes a method based on passive wireless surface acoustic wave temperature sensor saturation detection and adjustment to solve the problem of large sensor detection error and anti-interference during the detection process, but this method also cannot solve the problem when there is fixed interference in the system Impact on testing equipment

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