Anti-interference temperature signal receiver and signal processing method

Abstract

The invention provides an anti-interference temperature signal receiver and a signal processing method. The anti-interference temperature signal receiver comprises a digital signal processing chip, a transmitting phase-locked loop local oscillator, a fixed intermediate frequency oscillator, a first mixer, a first band-pass filter, a power amplifier module, a transceiving module, a second band-pass filter, a low noise amplifier, a receiving phase-locked loop local oscillator, a second mixer, a receiving intermediate frequency filter, a second receiving local oscillator, a third mixer and a power circuit. The frequency of a transmitting signal previously sent from the digital signal processing chip to the transmitting phase-locked loop local oscillator is higher than or lower than a reference signal frequency, and the frequency of a first intermediate signal obtained after an intermediate frequency signal generated by the fixed intermediate frequency oscillator and the stable transmitting signal acquired by the transmitting phase-locked loop local oscillator are mixed by the first mixer is consistent with the reference signal frequency, so that the transmitting and receiving synchronism is ensured, meanwhile, the problem of signal interference is further solved, and the measured temperature data is more accurate.

Description

Technical field [0001] The invention belongs to the cross application of wireless radio frequency technology and surface acoustic wave technology, and particularly relates to a wireless anti-interference temperature signal receiver and a signal processing method. Background technique [0002] The temperature measurement system is usually designed based on the principle and characteristics of the SAW resonator, and adopts the same working mode of receiving and transmitting at the same frequency and different receiving and transmitting periods. In principle, there should be no problem of receiving and transmitting interference when the working mode of receiving and transmitting time is different, but because the receiving and transmitting local oscillator circuit adopts phase-locked loop frequency synthesizer technology, from the frequency of the digital signal processing chip to the phase-locked loop It takes at least 500 microseconds to stabilize the output operating frequency, a...

AI Technical Summary

Problems solved by technology

[0003] The invention proposes an anti-interference temperature signal receiver and a signal processing method, which solves the problem of frequency mutual interference during transmission and reception in the prior art

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