Wireless detection devices and wireless detection methods

摘要

A wireless detection device is provided, comprising a voltage control oscillation unit, a transceiving unit, demodulation unit and processing unit. The voltage control oscillation unit generates different oscillation signals according to analog control voltages and corresponding injection signals. The transceiving unit outputs first wireless signals to a predetermined area according to the oscillation signals and receives second wireless signals generated by reflection of the first wireless signals to generate the injection signal. The demodulation unit demodulates the oscillation signals into first voltage signals. The processing unit subtracts the corresponding analog control voltages from the first voltage signals to generate second voltage signals, and when the variation of the second voltage signals exceeds a predetermined value on a target frequency in frequency domain, the processing unit calculates a real distance between an object and the transceiving unit.

主权项

1. A wireless detection device, comprising:
a voltage control oscillation unit, generating a plurality of oscillation signals with different frequencies according to analog control voltages; a transceiving unit, outputting a plurality of first wireless signals to an object in a predetermined area according to the oscillation signals, and receiving second wireless signals generated by reflection of the first wireless signals to yield self-injection-locking signals for modulating the voltage control oscillation unit; a demodulation unit, configured to demodulate the oscillation signals into first voltage signals; a signal generating unit, configured to generate the analog control voltages; and a processing unit, subtracting the corresponding analog control voltages from the first voltage signals to generate second voltage signals, wherein when the variation of the second voltage signals in frequency domain exceeds a predetermined value on a target frequency, the processing unit calculates a distance between the object and the transceiving unit and further a variation frequency of the distance according to the target frequency, wherein the processing unit further comprises:
a first subtractor, connected to the signal generating unit and the demodulation unit, and configured to subtract the corresponding analog control voltages from the first voltage signals to generate the second voltage signals;a first calculating unit, connected to the first subtractor, and configured to transform the second voltage signals into frequency domain;a storage unit, configured to store spectra of the transformed frequency domain of the second voltage signals at different times;a second subtractor, connected to the storage unit, and configured to obtain a difference between the spectra of the second voltage signals; anda second calculating unit, connected to the storage unit, and configured to transform the time-varying spectra into the variation frequency of the distance.