Calibrated radar apparatus and associated methods

摘要

A radar apparatus measures at least one characteristic of at least one object even in a near field. A sweep generator generates a sweep signal to modulate an oscillator to generate a varying frequency signal. A transmitter transmits the varying frequency signal as a radar signal. A receiver receives a reflected radar signal to produce a received signal using the varying frequency signal. A compensation signal memory holds a previously stored compensation signal. A compensation circuit compensates the received signal based on the previously stored compensation signal to produce a compensated received signal. A frequency transformation circuit transforms the compensated received signal to produce a frequency spectrum signal. A peak detector measures the characteristic of the object based on a peak of the frequency spectrum signal. When operating in a calibration mode and the reflected radar signal is quieted, the received signal is written into the compensation signal memory.

主权项

1. A radar apparatus for measuring at least one characteristic of at least one object, comprising
a sweep generator for generating a sweep signal; an oscillator coupled to the sweep generator and modulated by the sweep signal to generate a varying frequency signal; a transmitter operatively coupled to the oscillator to amplify the varying frequency signal and generate a radar signal; a receiver operatively coupled to the oscillator to receive a reflected radar signal reflected off of the at least one object and receive the reflected radar signal to produce a received signal using the varying frequency signal; a compensation signal memory for holding a previously stored compensation signal; a compensation circuit operatively coupled to the receiver and the compensation signal memory to compensate the received signal based on the previously stored compensation signal to produce a compensated received signal; a frequency transformation circuit operatively coupled to the compensation circuit to transform the compensated received signal into a frequency domain to produce a frequency spectrum signal of the compensated received signal; and a peak detector operatively coupled to the frequency transformation circuit to measure the characteristic of the object which the reflected radar signal was reflected based on a peak of the frequency spectrum signal.