ANTI-INTERFERENCE TEMPERATURE SIGNAL RECEIVING DEVICE AND SIGNAL PROCESSING METHOD

摘要

An anti-interference temperature signal receiving device and method. The device comprises a digital signal processing chip, a transmission phase-locked loop local oscillator, a fixed intermediate frequency oscillator, a first mixer, a first band-pass filter, a power amplifier, a transceiver module, a second band-pass filter, a low noise amplifier, a receiving phase-locked loop local oscillator, a second mixer, a receiving intermediate frequency oscillator, a second receiving local oscillator, a third mixer, and a power supply circuit. The digital signal processing chip is configured to transmit, in advance and to the transmission phase-locked loop, a signal having a frequency exceeding or less than a reference signal frequency. Because a first intermediate signal, generated by the first mixer mixing an intermediate frequency signal generated by the fixed intermediate frequency oscillator and a stable transmitted output by the transmission phase-locked loop local oscillator, has a frequency consistent with the reference signal frequency, it can be ensured that transmitting and receiving are performed at an identical frequency, while resolving a signal interference problem that occurs when the digital signal processing chip transmits the transmission signal to the transmission phase-locked loop local oscillator, and owing to a phase-locked loop characteristic and resulting in identical signal frequencies of a transmission signal and a reference signal during synchronization. Therefore, the invention can increase accuracy of a temperature data measurement.