Abstract: A radar system comprises: a plurality of reception antennas; a transmission wave generating device; a transmission antenna; a mixer; an A/D converter; a storage device which stores the digitized beat signals in association with each of the reception antennas; a Fourier transformation device which Fourier transforms the stored beat signals; a digital beam forming device which generates beam signals at predetermined pitch angles based on the Fourier transformed signals; an orientation detecting device which detects an orientation of the object using the generated beam signals; a distance detecting device which detects a distance to the object using the generated beam signals; and a signal separation processing device which performs separation processing of the beat signals based on the detected orientation and distance of the object, using the beat signals associated with each of the reception antennas, which are Fourier transformed by the Fourier transformation device.

Abstract: A radar system comprises: a plurality of reception antennas; a transmission wave generating device; a transmission antenna; a mixer; an A/D converter; a storage device which stores the digitized beat signals in association with each of the reception antennas; a Fourier transformation device which Fourier transforms the stored beat signals; a digital beam forming device which generates beam signals at predetermined pitch angles based on the Fourier transformed signals; an orientation detecting device which detects an orientation of the object using the generated beam signals; a distance detecting device which detects a distance to the object using the generated beam signals; and a signal separation processing device which performs separation processing of the beat signals based on the detected orientation and distance of the object, using the beat signals associated with each of the reception antennas, which are Fourier transformed by the Fourier transformation device.

Abstract: In a method for recognizing a preceding vehicle traveling on a traffic lane on which a subject vehicle is traveling, it is determined whether or not the preceding vehicle is deviated from a preceding vehicle recognizing region ahead of the subject vehicle. Then, when the preceding vehicle is deviated from the preceding vehicle recognizing region, it is determined whether or not the traffic lane is curved while maintaining recognition of the preceding vehicle. When the traffic lane is curved, it is determined whether or not the preceding vehicle has entered the preceding vehicle recognizing region for a predetermined time period while maintaining the recognition of the preceding vehicle. As a result, the recognition of the preceding vehicle is maintained or released in accordance with whether or not the preceding vehicle has entered the preceding vehicle recognizing region for the predetermined time period.

Abstract: In a method for recognizing a preceding vehicle traveling on a traffic lane on which a subject vehicle is traveling, it is determined whether or not the preceding vehicle is deviated from a preceding vehicle recognizing region ahead of the subject vehicle. Then, when the preceding vehicle is deviated from the preceding vehicle recognizing region, it is determined whether or not the traffic lane is curved while maintaining recognition of the preceding vehicle. When the traffic lane is curved, it is determined whether or not the preceding vehicle has entered the preceding vehicle recognizing region for a predetermined time period while maintaining the recognition of the preceding vehicle. As a result, the recognition of preceding vehicle is maintained or released in accordance with whether or not the preceding vehicle has entered the preceding vehicle recognizing region for the predetermined time period.

Abstract: A radar is provided, which enables determination of whether a detected target is a false image generated by a side lobe of the beam received by the antenna. In the radar, the first phase difference is obtained by actually calculating the target angle in the angle calculating section, and by supplying the calculated angle to a theoretical formula (with respect to the phase difference) in the first phase-difference calculating section. The second phase difference is directly calculated using actual received signals in the second phase-difference calculating section. These phase differences are compared with each other by the phase-difference calculating section, thereby determining whether the target exists at a side-lobe angle position of the beam received by the receiving antenna, based on a difference between two phase-difference characteristics.

Abstract: In a CPU monitoring apparatus, a lap time pulse, which is generated by the CPU in response to successive executions of a program, is monitored and determined whether its duration is between maximum and minimum values, or longer than the maximum value or shorter than the minimum value, and a program execution alarm signal is generated when the duration is either determined to be longer than the maximum value or shorter than the minimum value. The apparatus further determines whether the CPU has successfully or unsuccessfully executed a predetermined number of significant steps when the CPU has reputedly executed the program a predetermined number of times, and generates a step execution alarm signal if the CPU is determined as having unsuccessfully executed the predetermined number of significant steps.

Abstract: A vehicle collision detecting apparatus includes an acceleration sensor detecting acceleration of a motorcar, a frequency filter extracting a signal in a predetermined frequency band from the acceleration signal, and a detector for detecting a collision in accordance with the extracted signal. The detector supplies a trigger pulse to an airbag driver circuit.