Synthetic steering vector based beam forming meter-wave radar height measurement method

A technology of synthetic steering vector and meter-wave radar, which is applied in the field of beam-forming meter-wave radar altimetry based on synthetic steering vector, can solve the problems of indistinguishability, low measurement accuracy, and low altitude measurement speed, and avoid multi-beam clamping Angle problem, meet the calculation accuracy, reduce the effect of numerical range

Inactive Publication Date: 2013-09-11
XIDIAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art, such as large amount of calculation, low speed of height measurement, and low accuracy of measurement, and combine the synthetic steering vector with beamforming to solve the problem of large amount of calculation when radar height measurement is performed, and It avoids the indistinguishable problem of ordinary beamforming in the case of low elevation angle of the target, and provides a beamforming meter-wave radar altimetry method based on synthetic steering vectors with high measurement accuracy and low computational complexity

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  • Synthetic steering vector based beam forming meter-wave radar height measurement method

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Embodiment 1

[0066] The present invention is a beamforming meter-wave radar altimetry method based on synthetic steering vectors. Meter-wave radar plays an important role in anti-stealth and anti-radiation missiles, and the meter-wave radar altimetry problem is one of the difficult problems that need to be solved urgently. , which can be used for radar target tracking, refer to figure 1 , the beamforming meter-wave radar altimetry method based on synthetic steering vector of the present invention comprises the following steps:

[0067] Step 1: Extract the target signal x(t from the echo received by the radar k ), and determine the target elevation angle search range according to the target distance information.

[0068] Extract the target signal x(t from the echo received by the radar k ) process is usually: after processing the echo received by the radar with analog-to-digital conversion, amplitude and phase correction, IQ channel separation, pulse compression, clutter suppression and e...

Embodiment 2

[0082] The beamforming meter-wave radar altimetry method based on the synthetic steering vector is the same as in embodiment 1,

[0083] Step 1: Extract the target signal x(t from the echo received by the radar k ), and determine the target elevation angle search range according to the target distance information.

[0084] The model of radar receiving target signal among the present invention is as figure 2 shown. figure 2 A far-field narrowband signal is incident on a uniform linear array composed of M array elements, and the center A of the radar array is selected as the reference array element, h r is the radar center height, d is the radar array element spacing, θ a is the tilt angle of the antenna, r e is the equivalent earth radius, R d is the direct wave path from the target to the center of the radar, θ d is the search elevation angle from the direct wave to the center of the radar, θ i is the reflection angle from the reflected wave to the center of the radar...

Embodiment 3

[0148] The beamforming meter-wave radar altimetry method based on the synthetic steering vector is the same as that in Embodiment 1-2,

[0149] The effect of the present invention can be further illustrated by the following simulation.

[0150] Simulation content: radar wave reflection model analysis.

[0151] Simulation conditions:

[0152] Suppose the target distance is 100 kilometers, the target elevation angle range is 0.25°~16°, and the angle step is 0.05°, and a total of 316 points are calculated. The DSP adopts ADSP-TS201, and the core frequency is 600MHz. The relative error of the defined reflection angle is err ( θ i ) = abs ( θ ^ i - θ i ) / θ i ...

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Abstract

The invention discloses a synthetic steering vector based beam forming meter-wave radar height measurement method, and mainly aims to solve the problems of large signal processing operation and computational complexity of the prior art during height measurement. The method includes extracting a target signal from a radar echo and determining a target elevation angle searching range; building a radar wave reflection model and computing ground arc length between a reflection point and a radar center and ground arc length between the reflection point and a target by a searched elevation angle; computing equivalent heights of the target and the radar center and then computing a reflection angle and wave-path difference between a reflection wave and a direct wave; computing a synthetic steering vector; and after data beam forming of an echo, selecting an angle corresponding to a maximum normalization power value as a target elevation angle and computing the target height. Beam forming and the synthetic steering vector are combined, the target reflection model is simplified, elevation angle estimation precision of a meter-wave radar is guaranteed, computation speed of meter-wave radar height measurement is increased, a computational process for height measurement is simplified, and real-time signal processing of the meter-wave radar is easier.

Description

technical field [0001] The invention belongs to the technical field of radar signal processing, and mainly relates to meter-wave radar height measurement. Specifically, for digital array meter-wave radar, a method of beam-forming meter-wave radar height measurement based on synthetic steering vectors is proposed. At the same time, the computational load is reduced, and it is used for radar target tracking. Background technique [0002] Meter wave radar has anti-stealth and anti-radiation missile capabilities, but because of its longer wavelength, its antenna beam width is wider, the angular resolution is lower, and the multipath reflection of the ground (sea) surface when detecting targets at low elevation angles The phenomenon is more serious. Due to the strong correlation between multipath signals and direct wave signals, the altimetry problem of meter wave radar has always been a problem that has not been well solved in the radar field. [0003] At present, scholars at ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/08
Inventor 陈伯孝苏鹏朱伟杨明磊
Owner XIDIAN UNIV
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