[특허]Radar processor with range sidelobe reduction following doppler filtering

Radar processor with range sidelobe reduction following doppler filtering 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G01S-013/18 G01S-013/28 G01S-013/42
출원번호	US-0826301 (1992-01-21)
발명자 / 주소	Urkowitz Harry (Philadelphia PA)
출원인 / 주소	General Electric Company (Moorestown NJ 02)
인용정보	피인용 횟수 : 69 인용 특허 : 0

초록 ▼

A multipurpose system provides radar surveillance for air traffic control purposes. The system includes four separate active phased-array antennas, each with ±45°coverage in azimuth, from 0°to 60°in elevation. Each antenna element of each phased-array antenna is coupled by a low-loss path to the solid-state amplifier associated with a transmit-receive (TR) module. Each antenna produces a sequenc of pencil beams, which requires less transmitted power from the TR modules than a fan beam, but requires more time beacuse the pencil beam must be sequenced to cover the same volume as the fan beam. In order to scan the volume in a short time, the PRF is responsive to the elevation angle of the beam, so higher elevation angles use a higher PRF. Low elevation angle beams receive long transmitter pulses for high power, and pulse compression is used to restore range resolution, but the long pulse results in a large minimum range within which targets cannot be detected. A second scan is provided at low elevation angles with a short transmitter pulse to fill in the short-range coverage. Beams at higher elevation angles transmit pulse widths which are shorter than beams at low elevation angles, so that the minimum range requirement is met without a second scan, which also reduces the time required for volumetric scan. The number of pulses which are integrated to produce a return increases off-axis, to restore system margin lost due to off-axis power gain reduction. The volumetric scan rate is increased by a dynamic scan regimen by which subsets of beams are pulsed with a high transmitter PRF but with a low effective beam PRF to reduce range ambiguity and preserve Doppler resolution without the usual increase of scan time. For best range resolution, Doppler processing is used, with range sidelobe pulse suppression applied separetely to each Doppler frequency bin.

대표청구항 ▼

A Doppler radar system, comprising: transmitting means for transmitting dispersed pulses of electromagnetic radiation toward scatterers to generate returns; receiving means coupled for receiving said returns from said scatterers and for generating signals therefrom; filtering means coupled to said receiving means, for filtering said signals into a plurality of frequency bins to thereby produce a first plurality of signal components including a baseband signal component and a plurality of higher-frequency signal components, each having a frequency spectrum related to that of the associated bin; multiplying means coupled to said filtering means, for multiplying each of said higher-frequency signal components by an exponential waveform, the spectral component of which is centered at the negative of the frequency of the associated one of said frequency bins, to thereby convert each of said higher-frequency signal components into a baseband signal component; a plurality, equal in number to said first plurality, of range sidelobe suppression means, each of said range sidelobe suppression means being coupled to one of said filtering means and said multiplying means for individually processing each of said baseband signal components to reduce range sidelobes, to thereby produce a plurality of range sidelobe suppressed signals for further processing.

이 특허를 인용한 특허 (69)

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Song, William S., High duty cycle radar with near/far pulse compression interference mitigation.
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Lehtinen Markku Sakari,FIX, Method and system for measuring radar reflectivity and doppler shift by means of a pulse radar.
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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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Radar processor with range sidelobe reduction following doppler filtering 원문보기

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Radar processor with range sidelobe reduction following doppler filtering 원문보기

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연구과제 타임라인

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이 특허를 인용한 특허 (69)

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