Patent ID: 7598903
Filing Date: 2009-10-06
Classification: G01S

Abstract:
1. A distance measurement sensor comprising: a frequency-controllable oscillator for generating a reference signal and a transmission signal transmitted to a target object to be measured; an antenna for transmitting the generated signal and receiving the reception signal reflected from the target object to be measured; a power amplifier for amplifying the transmission signal; a low-noise amplifier for amplifying the reception signal; a first switch for controlling the power amplifier; a 6-port circuit for receiving the reference signal and the reception signal as its input signals, detecting a phase difference between the reference signal and the reception signal, and being able to obtain distance information denoted by power of a high-frequency signal on the basis of the detected phase difference; a second switch located between the frequency-controllable oscillator and the 6-port circuit, for controlling the reference signal; a high-frequency power detector for converting the high-frequency signal power into a DC voltage in four outputs of the 6 port circuit; an Analog-to-Digital Converter (ADC) for converting the DC voltage obtained by the high-frequency power detector into data capable of being calculated; and a Central Processing Unit (CPU) for controlling the frequency of the signal generated from the frequency-controllable oscillator and the first and second switches, calculating the output data of the ADC using an algorithm stored in the CPU itself as distance data, and displaying the distance data.