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Sparse array design method used for azimuth and pitching two-dimensional direction-finding

A sparse array and design method technology, applied in radio wave measurement systems, instruments, etc., can solve problems such as complex composition, high cost, and complex structure, and achieve the effects of low cost, low cost, and low system complexity

Active Publication Date: 2017-12-01
芜湖华创光电科技有限公司
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Problems solved by technology

The two-dimensional array antenna has a large number of antennas and channels, and its composition structure is complex. The two-dimensional array antenna used for passive radar often needs to cover a wide airspace through digital beamforming. Its structure is more complicated than that of the traditional phased array array antenna, resulting in high cost

Method used

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  • Sparse array design method used for azimuth and pitching two-dimensional direction-finding
  • Sparse array design method used for azimuth and pitching two-dimensional direction-finding
  • Sparse array design method used for azimuth and pitching two-dimensional direction-finding

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Embodiment 1

[0084] Taking the antenna design of an airport scene surveillance passive radar as an example, we design the working frequency of digital TV to be 600MHz, d=0.2m, and the theoretical formula (10) gives the signal with azimuth and elevation angles of (0° , 0°), (60°, 30°), (-60°, 30°), (60°, -30°), (-60°, -30°) incident beam patterns, see Figure 5 to Figure 9 As shown, the results in the figure are normalized by 20*log10(N). It can be seen from the figure that in the range of azimuth (-60°, 60°) and elevation (-30°, 30°), the side lobes of the beam pattern are all lower than 10dB; the target is incident at the center of the beam (0°, 0°) When , the formed beam pattern has better symmetry, and the main-side lobe ratio is 13dB; when the signal incident direction is other directions at that time, the side lobe of the elevation beam pattern will be raised. In the actual airport use, the installation elevation angle of the antenna is increased to 30° to effectively suppress multip...

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Abstract

The invention discloses a sparse array design method used for azimuth and pitching two-dimensional direction-finding. The sparse array design method comprises steps of establishment of a coordinate system, array deployment design, array manifold, and a weighting method. The sparse array design method is advantageous in that a number of channels under the condition of the same antenna aperture is less; under the condition of the same aperture, N is an array element number of routinely uniformly arranged array antennas in one dimension, and the number of the antenna channels is N2; by adopting the sparse design, the number of the two-dimensional direction-finding antenna channels is still N; by adopting the sparse array design method, costs of improving the direction-finding precision are greatly reduced, system complexity is low, and costs are reduced.

Description

technical field [0001] The invention relates to the technical field of traffic control in civil aviation, in particular to a sparse array design method for azimuth and elevation two-dimensional direction finding. Background technique [0002] Usually in the field of civil aviation traffic control, the detection and monitoring of targets around civil aviation airports is mainly completed by three-coordinate primary radar with altimetry capability. With the vigorous development of civilian drones, there have been many incidents of civilian drones intruding into the control area around the airport, causing large-scale flight delays, posing a serious threat to civil aviation flight safety. Civilian drones are typical low-altitude and slow-moving small targets, and conventional primary radars are weak in detecting such targets. Passive radar that uses civil radio and television signals as the source of illumination receives the echo signals of air targets, and through signal pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/02
CPCG01S7/02
Inventor 吴双
Owner 芜湖华创光电科技有限公司
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