In a radar device, a wide band filter unit suppresses unnecessary components contained in a reception signal subjected to frequency conversion by a frequency conversion unit. The wide band filter unit has frequency characteristics for performing filtering so that isolation between transmitting and r
In a radar device, a wide band filter unit suppresses unnecessary components contained in a reception signal subjected to frequency conversion by a frequency conversion unit. The wide band filter unit has frequency characteristics for performing filtering so that isolation between transmitting and receiving becomes a desired level or lower. Although the wide band filter unit has an increased noise power compared to a matched filter, the wide band filter performs the filtering so as not to round a pulse waveform.
대표청구항▼
1. A radar device, comprising: a transmission control unit that generates a reference signal corresponding to a predetermined radar method;a pulse signal generation unit that modulates the reference signal input from the transmission control unit into a pulse signal;a first antenna that radiates the
1. A radar device, comprising: a transmission control unit that generates a reference signal corresponding to a predetermined radar method;a pulse signal generation unit that modulates the reference signal input from the transmission control unit into a pulse signal;a first antenna that radiates the pulse signal from the pulse signal generation unit into air;a second antenna that receives a direct wave from the first antenna and a reflected signal from a target;a frequency conversion unit that uses the reference signal from the transmission control unit so as to convert a frequency of a reception signal received by the second antenna;a wide band filter unit having a band pass frequency response with a wider band width than a frequency band of the pulse signal, the wide band filter unit performing filtering without rounding a pulse waveform of the pulse signal so that isolation between transmitting and receiving is at least a predetermined level, the wide band filter unit suppressing frequency components outside the frequency band of the pulse signal in a signal from the frequency conversion unit to generate an output signal;an A/D conversion unit that converts the output signal from the wide band filter unit into a digital signal;a storage unit that stores the digital signal from the A/D conversion unit;a frequency analyzing unit that performs frequency analysis on the digital signal stored in the storage unit;a target detection unit that detects, from the signal processed by the frequency analyzing unit, the reflected signal from the target as a target signal; anda target distance and relative speed calculation unit that calculates, from the target signal detected by the target detection unit, a distance and a relative speed of the target. 2. A radar device according to claim 1, further comprising a digital filter unit having frequency characteristics for performing filtering so that a signal-to-noise ratio is maximized for the digital signal stored in the storage unit, wherein: two sets each including the frequency analyzing unit, the target detection unit, and the target distance and relative speed calculation unit are disposed in parallel to each other at a stage after the digital filter unit and a stage after the storage unit, respectively; andthe frequency analyzing unit of each set selectively receives one of a signal from the digital filter unit and the signal stored in the storage unit in accordance with a range gate for signal processing, and performs the frequency analysis on the received signal. 3. A radar device according to claim 1, further comprising an inter-range bin addition process unit that adds data of adjacent range bins contained in the digital signal stored in the storage unit, in accordance with a pulse width of a reception pulse, wherein: two sets each including the frequency analyzing unit, the target detection unit, and the target distance and relative speed calculation unit are disposed in parallel to each other at a stage after the inter-range bin addition process unit and a stage after the storage unit, respectively; andthe frequency analyzing unit of each set selectively receives one of a signal from the inter-range bin addition process unit and the signal stored in the storage unit in accordance with a range gate for signal processing, and performs the frequency analysis on the received signal. 4. A radar device according to claim 1, further comprising an inter-range bin addition process unit that is disposed at a stage after the frequency analyzing unit and adds data of adjacent range bins contained in the signal processed by the frequency analyzing unit in accordance with a pulse width of a reception pulse, wherein: two sets each including the target detection unit and the target distance and relative speed calculation unit are disposed in parallel to each other at a stage after the inter-range bin addition process unit and the stage after the frequency analyzing unit, respectively; andthe target detection unit of each set selectively receives one of a signal from the inter-range bin addition process unit and the signal from the frequency analyzing unit in accordance with a range gate for signal processing, and detects, from the received signal, the reflected signal from the target as the target signal. 5. A radar device according to claim 1, wherein the predetermined radar method comprises one of a multi-frequency step ICW method, a pulse Doppler method, an FM pulse method, and a combined band process method. 6. A radar device, comprising: a transmission control unit that generates a reference signal corresponding to a predetermined radar method;a pulse signal generation unit that modulates the reference signal input from the transmission control unit into a pulse signal;a first antenna that radiates the pulse signal from the pulse signal generation unit into air;a second antenna that receives a direct wave from the first antenna and a reflected signal from a target;a frequency conversion unit that uses the reference signal from the transmission control unit so as to convert a frequency of a reception signal received by the second antenna;a wide band filter unit that suppresses predetermined frequency components in a signal from the frequency conversion unit so as to extract an output signal;an A/D conversion unit that converts the output signal from the wide band filter unit into a digital signal;a storage unit that stores the digital signal from the A/D conversion unit;a digital filter unit that has a plurality of frequency characteristics and performs filtering on the digital signal stored in the storage unit;a frequency analyzing unit that performs frequency analysis on a signal from the digital filter unit;a target detection unit that detects the reflected signal from the target as a target signal from the signal processed by the frequency analyzing unit; anda target distance and relative speed calculation unit that calculates, from the target signal detected by the target detection unit, a distance and a relative speed of the target, wherein:the plurality of frequency characteristics of the digital filter unit comprise at least one frequency characteristics for performing the filtering on the digital signal stored in the storage unit so that a signal-to-noise ratio is maximized; andthe plurality of frequency characteristics of the digital filter unit comprise at least one band pass frequency characteristics having a wider band width than the frequency characteristics for performing the filtering so that the signal-to-noise ratio is maximized in order to perform the filtering without rounding a pulse waveform so that isolation between transmitting and receiving becomes at least a predetermined level on the digital signal stored in the storage unit. 7. A radar device according to claim 6, wherein: a plurality of sets each including the frequency analyzing unit, the target detection unit, and the target distance and relative speed calculation unit are disposed in parallel to each other at a stage after the digital filter unit; andthe frequency analyzing unit of each set selectively receives one of signals subjected to the filtering by the plurality of frequency characteristics of the digital filter unit in accordance with a range gate for signal processing, and performs the frequency analysis on the received signal. 8. A radar device according to claim 7, wherein the predetermined radar method comprises one of a multi-frequency step ICW method, a pulse Doppler method, an FM pulse method, and a combined band process method.
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이 특허에 인용된 특허 (4)
Sullivan, William B., Interference suppression circuit and method thereof for multi-channel receivers.
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