Patent ID: 6404381
Filing Date: 2002-06-11
Classification: G01S

Abstract:
A radar sensor device for detecting at least one of a distance and a speed of an object relative to the radar sensor device, comprising:a frequency-detunable oscillator operating with a given frequency and a given phase for generating a transmitted signal; a transmitting antenna, connected to said frequency-detunable oscillator, for emitting a radar signal based on the transmitted signal; a receiving antenna for receiving a radar received signal reflected by an object to be detected; a demodulation unit, connected to said frequency-detunable oscillator and to said receiving antenna, for forming a demodulated received measuring signal from the transmitted signal and the radar received signal; a control unit, connected to said frequency-detunable oscillator, for electronically driving said frequency-detunable oscillator with a modulation function and for evaluating the demodulated received measuring signal; a power switch connected between said frequency-detunable oscillator and said transmitting antenna, said control unit driving said power switch with a power control function for varying a transmitter power for said transmitting antenna; a reference unit assigned to said frequency-detunable oscillator, said reference unit generating a reference signal for monitoring the given frequency and the given phase of said frequency-detunable oscillator; and said control unit setting the modulation function and the power control function in a variable manner, and controlling said frequency-detunable oscillator and said power switch alternatingly in at least two different, mutually overlapping operating modes tuned to different measuring ranges.