Meter wave radar height measurement method based on array interpolation compression perception
A compressed sensing and array technology, which is applied in the fields of compressed sensing, meter wave radar altimetry, and target tracking, can solve the problems of large signal-to-noise ratio fluctuation, large amount of calculation, and difficulty in implementing method 1, so as to improve the estimation accuracy and estimation accuracy. The result is excellent, the effect of reducing the amount of calculation
Active Publication Date: 2013-10-16
XIDIAN UNIV
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Problems solved by technology
Multipath interference has a great impact on the measurement accuracy of radar at low elevation angles. The direct wave and multipath reflected wave signals have a strong correlation; Within the width; lobe splitting will cause the level of the received signal to flicker, and the signal-to-noise ratio fluctuates greatly
Terrain fluctuations have a great influence on the measurement results at low elevation angles, especially in the sea surface with relatively large sea conditions or land in complex areas. The reflection clutter of the ground (sea) surface is strong, and the target signal is often submerged in the clutter, and the clutter The non-stationarity and spikes of the wave will lead to a rapid increase in the probability of false alarms
Therefore, it is difficult to measure height in a multi-path environment, so the problem of measuring height with meter wave radar has always been a problem that has not been well solved in the radar industry.
[0010] Among the above methods, method 1 is difficult to implement; method 2 is only suitable for flat positions, and its accuracy is poor, which cannot meet the actual needs; method 3 has a large amount of calculation, requires a large number of samples, and its performance decreases in a multipath environment, or even fails
Therefore, in the process of dealing with the problem of height measurement at low elevation angles, the existing methods of height measurement have poor effectiveness and are no longer applicable
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[0043] The content and effects of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0044] refer to figure 1, the present invention comprises the following steps:
[0045] Step 1: Extract the target signal from the radar echo to obtain the array flow pattern matrix W of the real array.
[0046] The array radar used is a uniform linear array placed vertically, which is composed of M array elements with an interval of d.
[0047] Suppose there are K far-field narrowband signals incident on the uniform linear array, M>K, and the signal incident angle is α i , i=1,2,...,K, then the target signal received by the array at time t is:
[0048] X(t)=Vs(t)+n(t),
[0049] Among them, X is the received data of the M×1 dimensional array element, n is the M×1 dimensional white noise, which satisfies zero mean and variance σ 2 The complex Gaussian distribution of each array element output noise is statistically independent; s=[s 1 ...
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The invention discloses a height measurement method based on an array interpolation compression perception. The height measurement method mainly aims at solving a low elevation height measurement problem under a multipath environment, and especially under low signal to noise ratio and less snapshot environments. The method comprises the following steps of extracting a target signal from a radar echo; acquiring a spatial-domain sparse signal through cancellation and signal reconstruction; using a wave beam formation method to obtain a rough measurement target angle; according to the rough measurement angle, acquiring the spatial domain and dividing the spatial domain; using the array interpolation to acquire a virtual array; according to a matrix transformation relation, acquiring an interpolation transformation matrix and carrying out prewhitening processing on the interpolation transformation matrix; using a whitening interpolation transformation matrix and an observation matrix to acquire an observation signal; using a whitening interpolation transformation matrix and observation signal iteration operation to acquire a target signal estimation value; extracting a target angle from the target signal estimation value so as to acquire a target height. By using the method of the invention, sampling points of the target signal and computation intensity are obviously reduced; sidelobes of a signal power spectrum and a space spectrum are effectively reduced; the method can be used in target tracking.
Description
technical field [0001] The invention belongs to the technical field of radar signal processing, in particular to a compressed sensing and meter wave radar altimetry method, which can be used for target tracking. Background technique [0002] Domestic and foreign radar circles generally believe that meter wave radar has anti-stealth capabilities. Meter wave radar has a long wavelength and wide beam, especially when measuring low-angle targets, the beam hits the ground, the ground reflection is strong, and the multipath phenomenon of the target is serious, resulting in low measurement accuracy or even complete failure of the meter wave radar. In addition to the radio wave refraction effect caused by the inhomogeneity of the lower atmosphere, the radar received signal also has the multipath interference effect caused by the specular reflection and diffuse scattering caused by the ground and sea surface. Multipath interference has a great impact on the measurement accuracy of r...
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IPC IPC(8): G01S7/41
Inventor 陈伯孝张晰朱伟杨明磊
Owner XIDIAN UNIV
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