IPC분류정보
| 국가/구분 |
United States(US) Patent
등록
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| 국제특허분류(IPC7판) |
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| 출원번호 |
US-0205471
(1994-03-04)
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발명자
/ 주소 |
- Urkowitz Harry (Philadelphia PA) Bucci Nicholas J. (Upper Darby PA) Freedman Jerome E. (Margate NJ)
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| 출원인 / 주소 |
- Martin Marietta Corporation (Moorestown NJ 02)
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| 인용정보 |
피인용 횟수 :
34 인용 특허 :
0 |
초록
▼
A method and apparatus for identifying a remote target includes a transmitter for transmitting pulses of energy toward the target for generating echo signals, and a receiver for receiving the echo signals, and for generating received signals representing the target, noise and clutter. The received s
A method and apparatus for identifying a remote target includes a transmitter for transmitting pulses of energy toward the target for generating echo signals, and a receiver for receiving the echo signals, and for generating received signals representing the target, noise and clutter. The received signals are applied through a plurality of cascaded channels, each including a Doppler filter cascaded with a multiplier, each also including range sidelobe suppression, for, in each of the cascaded channels, narrowband filtering the signals passing therethrough about a controllable center frequency, and for, if necessary, converting the signals passing therethrough to baseband, for thereby applying one of a plurality of Doppler filtered baseband signals to the input of each of the range sidelobe suppressors of each of the cascaded channels. The power of the Doppler filtered baseband signals in each range bin is evaluated for determining the frequency at which the spectral density is greatest. The center frequency of at least one of the cascaded Doppler channels is controlled such that one of the Doppler channels has its center frequency at the maximum-power frequency.
대표청구항
▼
A radar system, comprising; transmitting means for transmitting pulses of energy toward a target, for generating echo signals; receiving means for receiving said echo signals, for generating received signals; a plurality of Doppler filters, each of which is cascaded with a multiplier for forming a l
A radar system, comprising; transmitting means for transmitting pulses of energy toward a target, for generating echo signals; receiving means for receiving said echo signals, for generating received signals; a plurality of Doppler filters, each of which is cascaded with a multiplier for forming a like plurality of cascaded channels, each of said cascaded channels including a received signal input port, a signal output port, and a frequency control signal input port, said received signal input port of each of said cascaded channels being coupled to said receiving means for receiving said received signals therefrom, for, in each of said channels, narrowband filtering the signals passing therethrough about a center frequency controllable in response to a frequency control signal, and for, if necessary, converting said signals passing therethrough to baseband, for thereby generating one of a plurality of Doppler filtered baseband signals at said output port of each of said cascaded channels, each of which Doppler filtered baseband signals is representative of a different range of target velocities; signal processing means coupled to said signal output port of each said plurality of Doppler filters for receiving said Doppler filtered baseband signals therefrom, and for processing said Doppler filtered baseband signals for determining which range bin has the greatest amplitude attributable to echo signals, and for determining said amplitude, to thereby generate maximum reflectivity signals; Doppler power spectrum determining means coupled to said signal processing means for receiving said maximum reflectivity signals therefrom, for generating an estimate of the power spectrum of said maximum reflectivity signals to determine a maximum-power frequency; and control means coupled to said Doppler power spectrum determining means and to said plurality of cascaded channels, for generating and applying said frequency control signal to said frequency control input port of at least one of said cascaded channels, for controlling said cascaded channels such that at least said one of said cascaded channels has its said center frequency at said maximum-power frequency.
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