Target object detection system
First Claim
1. A target object detection system for emitting, toward a target object, transmission signals as transmission waves, whose frequencies have been modulated successively into a plurality of stepped frequencies, and for receiving echoes of the transmission waves reflected from the target object, thereby to calculate a relative velocity of the target object by frequency-analyzing reception signals obtained from the echoes, the target object detection system comprising:
- a frequency-modulation unit that successively executes, within a measurement time derived from a desired velocity resolution, a plurality of times iterated frequency-modulation processes, where each of the frequency-modulation processes successively modulates the transmission signals into the stepped frequencies; and
a frequency-analysis unit that frequency-analyzes, within said measurement time, for each of the stepped frequencies, throughout the plurality of frequency-modulation processes those signals, among the reception signals, corresponding to the identical stepped frequency in the frequency-modulation processes,wherein said measurement time is a minimum frequency modulation period required for the desired velocity resolution.
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Abstract
A time needed until measurement values are obtained in a two-frequency continuous wave radar systems is reduced.
An object detection system that emits transmission signals, as transmission waves, whose frequencies have been modulated successively into a plurality of stepped frequencies, and receives echoes of the transmission waves reflected from target objects, thereby calculating relative velocities of the target objects by frequency-analyzing reception signals obtained from the received echoes. The target object detection system includes: a frequency modulation component that repeatedly executes frequency-modulation processes to successively modulate the transmission signals into those of the stepped frequencies, within a minimum measurement time in which a desired velocity resolution is achieved; and a frequency-analysis component that frequency-analyzes throughout the repeated frequency-modulation processes the reception signals processed by the frequency-modulation component.
31 Citations
12 Claims
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1. A target object detection system for emitting, toward a target object, transmission signals as transmission waves, whose frequencies have been modulated successively into a plurality of stepped frequencies, and for receiving echoes of the transmission waves reflected from the target object, thereby to calculate a relative velocity of the target object by frequency-analyzing reception signals obtained from the echoes, the target object detection system comprising:
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a frequency-modulation unit that successively executes, within a measurement time derived from a desired velocity resolution, a plurality of times iterated frequency-modulation processes, where each of the frequency-modulation processes successively modulates the transmission signals into the stepped frequencies; and a frequency-analysis unit that frequency-analyzes, within said measurement time, for each of the stepped frequencies, throughout the plurality of frequency-modulation processes those signals, among the reception signals, corresponding to the identical stepped frequency in the frequency-modulation processes, wherein said measurement time is a minimum frequency modulation period required for the desired velocity resolution. - View Dependent Claims (2, 3, 4)
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5. A target object detection method of emitting, toward a target object, transmission signals as transmission waves, whose frequencies have been modulated successively into a plurality of stepped frequencies, and of receiving echoes of the transmission waves reflected from the target object, thereby to calculate a relative velocity of the target object by frequency-analyzing reception signals obtained from the echoes, the target object detection method comprising:
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successively executing, within a measurement time derived from a desired velocity resolution, a plurality of times iterated frequency-modulation processes, each of the frequency-modulation processes successively modulating the transmission signals into the stepped frequencies; and frequency-analyzing, within said measurement time, for each of the stepped frequencies, throughout the plurality of frequency-modulation processes, those signals, among the reception signals, corresponding to the identical stepped frequency in the frequency-modulation processes, wherein said measurement time is a minimum frequency modulation period required for the desired velocity resolution. - View Dependent Claims (6, 7, 8)
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9. A target object detection device for emitting, toward a target object, transmission signals as transmission waves, whose frequencies have been modulated successively into a plurality of stepped frequencies, and for receiving echoes of the transmission waves reflected from the target object, thereby to calculate a relative velocity of the target object by frequency-analyzing reception signals obtained from the echoes, the target object detection device comprising:
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a frequency-modulation unit that successively executes, within a measurement time derived from a desired velocity resolution, a plurality of times, iterated frequency-modulation processes, where each iterated frequency-modulation process successively modulates the transmission signals into the stepped frequencies; and a frequency-analysis unit that frequency-analyzes, within said measurement time, for each of the stepped frequencies, throughout the plurality of frequency-modulation processes those signals, among the reception signals, corresponding to the identical stepped frequency in the frequency-modulation processes, wherein said measurement time is a minimum frequency modulation period required for the desired velocity resolution. - View Dependent Claims (10, 11, 12)
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Specification