Radar system
AssigneeHonda Giken Kogyo Kabushiki Kaisha
InventorsYasushi Okada, Katsuhiko Takebe, Hiroyuki Ando
Life of this patent
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Abstract
A radar system is designed to allow switched use of a pulse radar mode for detecting a target at a long distance away and a phase-difference radar mode for detecting a target at a short distance away, whereby target detection can be performed from a very close range to a long range with high accuracy. Also, the pulse radar mode enables detection of a plurality of targets in different ranges.
Claims11
A radar system for transmitting a high-frequency signal, receiving a signal reflected by a target and detecting a range to the target based on the time difference between the transmitted signal and received signal, said radar system comprising:
- a pulse radar mode for transmitting a high-frequency signal as a pulse of narrow width with respect to a repeated transmission cycle and detecting said range to said target based on the time difference between transmission and reception of said pulse;
- a phase-difference radar mode for transmitting a signal, obtained by modulating a high frequency signal with a low-frequency signal, and detecting said range to said target based on the phase difference between a low-frequency signal, obtained by detecting a received signal reflected by said target, and said transmitted low-frequency signal;
- and
- switching means for allowing switched use of said pulse radar mode and said phase-difference radar mode.
A radar system for transmitting a high-frequency signal, receiving a signal reflected by a target and detecting a range to the target based on the time difference between the transmitted signal and received signal, said radar system comprising:
- a pulse radar mode for transmitting a high-frequency signal as a pulse of narrow width with respect to a repeated transmission cycle and detecting said range to said target based on the time difference between transmission and reception of said pulse;
- a phase-difference radar mode for transmitting a signal, obtained by modulating a high-frequency signal with a low-frequency signal, and detecting said range to said target based on the phase difference between a low-frequency signal, obtained by detecting a received signal reflected by said target, and said transmitted low-frequency signal;
- switching means for allowing switched use of said pulse radar mode and said phase-difference radar mode;
- a transmitting antenna;
- a high-frequency oscillator for generating a high-frequency signal in a millimetric-wave band;
- a switching device disposed between said high-frequency oscillator and said antenna and being capable of switching operation for allowing transmission of said narrow-width pulse and said high-frequency signal intermittently modulated with said low-frequency signal;
- and
- a shifter for operating in said pulse radar mode to sequentially shift the sampling timing for A/D converting said received pulse every time pulse transmission is repeated, so as to obtain time-base-extended received pulse data.
A radar system for transmitting a high-frequency signal, receiving a signal reflected by a target and detecting a range to the target based on the time difference between the transmitted signal and received signal, said radar system comprising:
- a pulse radar mode for transmitting a high-frequency signal as a pulse of narrow width with respect to a repeated transmission cycle and detecting said range to said target based on the time difference between transmission and reception of said pulse;
- a phase-difference radar mode for transmitting a signal, obtained by modulating a high-frequency signal with a low-frequency signal, and detecting said range to said target based on the phase difference between a low-frequency signal, obtained by detecting a received signal reflected by said target, and said transmitted low-frequency signal;
- switching means for allowing switched use of said pulse radar mode and said phase-difference radar mode;
- a transmitting antenna;
- a high-frequency oscillator for generating a high-frequency signal in a millimetric-wave band;
- a switching device disposed between said high-frequency oscillator and said antenna and being capable of switching operation for allowing transmission of said narrow-width pulse and said high-frequency signal intermittently modulated with said low-frequency signal;
- and
- a time-difference-to-voltage converter adapted to operate in said pulse radar mode to generate a voltage, corresponding to said time difference between said transmitted and received pulses, to be A/D converted to obtain data relative to said time difference.
Dependencies are inferred from the claim text.