A Calculation Method of Waveguide Antenna Beam Peak Angle Used in Surveillance Radar
A beam peak angle, surveillance radar technology, applied in the direction of using re-radiation, radio wave measurement system, radio wave reflection/re-radiation, etc. problem, to achieve the effect of strong operability and simple algorithm
Active Publication Date: 2018-03-13
BEIJING HUAHANG RADIO MEASUREMENT & RES INST
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Problems solved by technology
In actual use, it is unrealistic to measure the beam peak angles of all frequency points in the surveillance radar antenna transmission frequency set, and only part of the frequency points can be measured, which will limit the use of surveillance radars to transmit frequency points
[0004] Waveguide antenna beam peak angle measurement mainly reflects the directivity of the peak energy of the antenna at a specific frequency. Due to the large size of the surveillance radar antenna, the far-field test method is usually used, and it is not easy to measure all frequency points within the frequency range.
Under the premise that the antenna beam direction is unknown, this limits the use of the surveillance radar's transmission frequency and cannot maximize the effectiveness of the surveillance radar
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[0025] The technical solution of the invention will be described in detail below in conjunction with the detection application of a certain surveillance radar to port ships.
[0026] The surveillance radar uses a solid-state transmitter and employs coherent pulse compression technology. The radar antenna is erected at a height of 50m, which can realize the detection and tracking of ship targets within a range of 30 nautical miles. In order to obtain good azimuth resolution performance, an 18-foot waveguide slotted antenna is used with an azimuth beamwidth of 0.42 degrees. The transmitting frequency range of the radar is 9.2G ~ 9.6G, and it has the ability to resist co-frequency and asynchronous interference. That is, when the radar receives co-frequency interference from other external radars, it has automatic frequency hopping capability to achieve the purpose of suppressing co-frequency and asynchronous interference. Among them, the minimum interval of radar frequency hopp...
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The invention discloses a calculation method for the wave guide antenna beam peak angle of a surveillance radar. The method includes the following steps that: the beam peak angles of partial frequency points of the antenna are measured; a correlation function between the beam peak angles of the antenna and emission frequencies is established; according to corresponding criteria, and based on a measurement result, the correlation function is analyzed; and the calculation of the beam peak angles of the waveguide antenna in an emission band range can be realized. With the method adopted, the effective calculation of the beam peak angles of the antenna under different frequencies can be realized, the azimuth precision of target tracking of the surveillance radar can be ensured.
Description
technical field [0001] The invention belongs to the field of radar target processing, and in particular relates to a method for calculating the peak angle of a waveguide antenna beam used for surveillance radar, in particular to the antenna beam peak value used in the target positioning technology of Vessel Traffic Services (VTS) Angle calculation technology. Background technique [0002] In the VTS system, surveillance radar (also known as VTS radar) realizes the detection and tracking of relevant water targets through periodic scanning. The azimuth detection and tracking of the target is realized through the feedback angle of the servo code disc combined with the antenna beam pointing. Among them, the servo code disc reflects the physical position information of the antenna rotation, which is mainly affected by the quantization accuracy of the code disc azimuth. The quantization accuracy is relatively fixed and does not change with the external environment; For peak poin...
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IPC IPC(8): G01S13/66G01S7/282
CPCG01S7/282G01S13/66
Inventor 张延强潘清云马哲张晓菲曹德胜王玮阚津曾宇翔李澳航丁建良赵旭
Owner BEIJING HUAHANG RADIO MEASUREMENT & RES INST