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公开(公告)号：EP3358365A1
公开(公告)日：2018-08-08
申请号：EP15905348.7
申请日：2015-09-29
IPC分类号： G01S7/42
CPC分类号： G01S13/95 , G01S7/025 , G01S7/42 , G01S13/581 , Y02A90/18
摘要： A linear-depolarization ratio calculator (12) is configured so as to determine a radar reflectivity factor Z hh in transmission of a horizontally polarized wave and reception of a horizontally polarized wave, the radar reflectivity factor being a reflected wave intensity after integration of a reflected wave intensity V hh (n) calculated by a reflected-wave intensity calculator (11), and a radar reflectivity factor Z vh in transmission of a horizontally polarized wave and reception of a vertically polarized wave, the radar reflectivity factor being a reflected wave intensity after integration of a reflected wave intensity V vh (n+2), and calculate a linear depolarization ratio LDR vh which is the ratio between the radar reflectivity factor Z hh and the radar reflectivity factor Z vh . As a result, even when three types of polarized-wave transmission/reception processing elements are repeatedly performed, the linear depolarization ratio LDR vh can be calculated.
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公开(公告)号：EP3835825A1
公开(公告)日：2021-06-16
申请号：EP19846660.9
申请日：2019-06-14
IPC分类号： G01S13/95 , G01S13/524
摘要： A signal processing apparatus (5) that performs signal processing on a Doppler spectrum derived from a reception signal of a reflected wave of pulsed undulation repeatedly transmitted into a space removes a topographic echo spectrum from the Doppler spectrum and extracts a plurality of candidate points of a target echo spectrum from the Doppler spectrum from which the topographic echo spectrum has been removed. Furthermore, the signal processing apparatus (5) determines positional relation between the candidate points and a plurality of removed points of the topographic echo spectrum removed from the Doppler spectrum and extracts as an interpolation point, a point where the target echo spectrum is missing by removal of the topographic echo spectrum based on positional relation between the candidate points and the removed points in a direction of a frequency axis.
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公开(公告)号：EP3845925A1
公开(公告)日：2021-07-07
申请号：EP19855092.3
申请日：2019-06-14
IPC分类号： G01S13/95
摘要： Based on a reception signal of a reflected wave of pulsed undulation repeatedly transmitted into a space, a Doppler spectrum derived from the reception signal, and a topographic-echo-removed spectrum resulting from removal of a topographic echo from the Doppler spectrum, a first weather echo region is found by using a weather parameter among weather parameters that is different in behavior between a weather echo and the topographic echo, and a second weather echo region is found by using a weather parameter among the weather parameters a behavior of which is not dependent on a Doppler velocity. Alternatively, a weather echo region where a Doppler velocity is zero is found based on the weather parameter, and the weather echo region is determined based on the first weather echo region and the second weather echo region or based on the first weather echo region and the weather echo region where the Doppler velocity is zero. A signal processing apparatus and a signal processing method with which a zero-Doppler weather echo attenuated, that is, erroneously suppressed, by topographic echo removal processing is readily reconstructed are thus obtained.
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公开(公告)号：EP4296710A1
公开(公告)日：2023-12-27
申请号：EP22756242.8
申请日：2022-02-16
摘要： A radar system, a radar device, and an interference avoidance method are obtained that can utilize frequency effectively even in three or more radar devices. The present disclosure relates to interference avoidance between three or more radar devices 1 arranged to have an overlapping scanning/radiation range being a range at which a scanning range of radar device 1 overlaps with the scanning range or a secondary radiation range of each of other radar devices 1, the same overlapping scanning/radiation range being overlapped by each of the three or more radar devices, the scanning range and the secondary radiation range of the radar device that are ranges in each of which the radar wave, is transmitted and is received by radar device 1 while an orientation direction is changed. A radar system 50 includes three or more radar devices 1 and a schedule management controller 6. Schedule management controller 6 predicts an interference time period that is a time period during which the overlapping scanning/radiation range is generated, determines a first interference avoidance measure that is a measure to make radar devices 1 to use respective different use frequencies while keeping a restriction on the number of frequency channels, in the predicted interference time period, and determines a second interference avoidance measure to be performed by a radar device that is unable to avoid interference by the first interference avoidance measure.
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公开(公告)号：EP3835822A1
公开(公告)日：2021-06-16
申请号：EP19848005.5
申请日：2019-06-14
摘要： A secondary echo and a primary echo subjected to topographic echo processing are compared with each other. When there is a topographic echo in the primary echo or the secondary echo determined as a strong echo, an echo resulting from removal of the topographic echo is defined as a strong-topographic-echo-removed reception signal. Electric power of the topographic echo in the secondary echo or the primary echo determined as a weak echo and the strong-topographic-echo-removed reception signal are defined as weak echo parameters. Electric power of the weak echo estimated from a reception signal in a weak echo region resulting from phase correction of a reception signal resulting from removal of a frequency component of the strong echo from the strong-topographic-echo-removed reception signal representing the weak echo parameter, a spectral width of the weak echo representing the weak echo parameter, and a Doppler velocity of the weak echo are provided as spectral parameters of the weak echo.
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公开(公告)号：EP3460505A1
公开(公告)日：2019-03-27
申请号：EP16902433.8
申请日：2016-05-20
摘要： In a weather radar apparatus, an array antenna (11) includes antenna elements arranged in a horizontal direction and an elevation angle direction to radiate transmission waves into space and receive reflected waves which are the transmission waves reflected from space. An antenna driver (15) rotates the array antenna (11) in an azimuth direction. A transmitter (12) controls the antenna elements to radiate the transmission waves with controlled amplitudes and phases respectively so as to form a transmission fan beam extending in the azimuth direction. A reception beam former (18) processes reception signals generated by the antenna elements from the reflected waves so as to form a plurality of reception beams in the azimuth direction. A reception beam allocator (19) receives an azimuth at which the array antenna (11) is oriented, and allocates the reception beams to respective azimuth ranges which are predetermined ranges of azimuth. A weather observer (21) obtains information about a result of weather observation for each of the azimuth ranges, from the reception beams allocated to the respective azimuth ranges by the reception beam allocator (19).
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