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    • 5. 发明授权
    • Radar system with active array antenna, elevation-responsive PRF
control, and pulse integration control responsive to azimuth angle
    • US5115244A
    • 1992-05-19
    • US686053
    • 1991-04-16
    • Jerome E. FreedmanMichael S. PerryJohn J. Gallagher
    • Jerome E. FreedmanMichael S. PerryJohn J. Gallagher
    • G01S13/22G01S13/28G01S13/42G01S13/44G01S13/66
    • G01S13/282G01S13/22G01S13/426G01S13/44G01S13/66
    • A multipurpose system provides radar surveillance for air traffic control purposes. The system includes four separate active phased-array antennas, each with .+-.45.degree. coverage in azimuth, from 0.degree. to 60.degree. 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 sequence of pencil beams, which requires less transmitted power from the TR modules than a fan beam, but requires more time because 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 separately to each Doppler frequency bin.
    • 7. 发明授权
    • Broadband short-horn antenna
    • 宽带短角天线
    • US5359339A
    • 1994-10-25
    • US92645
    • 1993-07-16
    • Ashok K. AgrawalMichael S. PerryNorman R. Landry
    • Ashok K. AgrawalMichael S. PerryNorman R. Landry
    • H01Q13/02H01Q13/00
    • H01Q13/0275
    • A short horn antenna (10) adapted for array use includes a rectangular waveguide with broad upper (12) and lower (14) walls and narrow side walls (16, 18), defining a radiating aperture (20) and a feed end closed off by a shorting plate (22). A stepped upper ridge (26) has a slot (50) adjacent the shorting plate, and a shorter stepped lower ridge (46) has a corresponding slot. An unbalanced transmission line (75) extends through the shorting wall, and the smaller conductor (76) extends into the waveguide as an electric probe (60). The probe includes a first portion (64), extending parallel to the waveguide axis (8) and into the slot in the upper ridge. The probe (60) also includes a second portion (66) extending at an angle (90.degree.) relative to the first portion (64) of the probe (60).
    • 适用于阵列使用的短喇叭天线(10)包括具有宽上(12)和下(14)壁的矩形波导和限定辐射孔(20)的窄侧壁(16,18),并且馈送端封闭 通过短板(22)。 阶梯状上脊(26)具有与短路板相邻的槽(50),较短的阶梯状下脊(46)具有相应的槽。 不平衡传输线(75)延伸穿过短路壁,并且较小的导体(76)作为电探针(60)延伸到波导中。 探针包括平行于波导轴线(8)延伸并进入上脊中的狭槽的第一部分(64)。 探针(60)还包括相对于探针(60)的第一部分(64)以一定角度(90°)延伸的第二部分(66)。