A Weighted Multi-Frequency Maximum Likelihood Elevation Angle Estimation Method Based on Composite Multipath Factor Estimation
An elevation and factor technology, applied in the field of radar, can solve the problems of reducing the amount of calculation, large amount of calculation, unfavorable engineering implementation, etc., to reduce the angle estimation error, improve the angle estimation performance, and enhance the stability.
Active Publication Date: 2022-05-03
西安雷擎电子科技有限公司
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[0003] Recently, super-resolution algorithms based on array signals have been applied to elevation angle estimation. The typical one is the maximum likelihood estimation method. Its biggest advantage is that it can process coherent signals, and the accuracy of the estimation results is high, but the disadvantage is that it requires multi-dimensional space. Searching requires a large amount of calculation, which is not conducive to engineering implementation; subsequently, some scholars proposed a maximum likelihood estimation method based on alternating projections, which greatly reduced the amount of calculation, but the error will increase when the angle between the direct wave and the reflected wave is small ; Then someone proposed a maximum likelihood estimation method using a lot of terrain information, the estimation accuracy has been improved, but this method is essentially an algorithm that matches the terrain, and it is difficult to obtain accurate terrain information in practice. Or positions with large terrain changes, this method is almost ineffective
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[0022] refer to figure 1 , is a kind of weighted multi-frequency maximum likelihood elevation angle estimation method flow chart based on composite multipath factor estimation of the present invention; Wherein said weighted multi-frequency maximum likelihood elevation angle estimation method based on composite multipath factor estimation comprises the following steps:
[0023] Step 1, determine the array radar, the array radar includes N antenna elements, and the N antenna elements are equally spaced and evenly distributed; the array radar transmits signals including Q frequency points to the target within its detection range and receives signals from the target The multi-frequency composite echo signal of the target, the multi-frequency composite echo signal of the target includes Q frequency point echoes, and the Q frequency point echoes are echo signals received by the array radar elevation dimension; since the purpose of the present invention is to estimate the target Ther...
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The invention discloses a weighted multi-frequency maximum likelihood elevation angle estimation method based on composite multipath factor estimation. The main idea is to determine the array radar, which includes N antenna elements, and the array radar detects After the target in the range transmits a signal including Q frequency points, it receives a multi-frequency composite echo signal from the target, and the multi-frequency composite echo signal of the target includes Q frequency point echoes; determine the target distance unit and obtain N antennas The array element takes L times digital sampling snapshot data of Q frequency point echoes, calculates the covariance matrix estimation q=1,2,3,...,Q of the qth frequency point echoes; and then obtains the multi-frequency composite weight matrix W; and the composite covariance matrix estimation of the multi-frequency echo determines the angular search range of the array radar, searches the angular search range of the array radar multiple times with a set interval, obtains the corresponding spatial spectrum value after multiple searches, and then Construct the spatial spectrum Z, and then obtain the estimated value of the elevation angle of the target.
Description
technical field [0001] The invention belongs to the technical field of radar, and proposes a weighted multi-frequency maximum likelihood elevation angle estimation method based on composite multipath factor estimation, which is suitable for radar elevation angle estimation of low-altitude targets. Background technique [0002] With the continuous development of flight technology, in modern warfare, enemy fighter planes and missiles use low-altitude flight to avoid radar and anti-aircraft weapons, so as to approach the target position for surprise attack, which requires radar to accurately measure and track low-altitude flying targets. Requirements: Due to the influence of multipath effect, when the radar detects low-altitude targets, the radar receiving end will not only receive the echo signal from the real target, but also receive the echo signal of the mirror target of the target on the horizontal plane, which is The correlation between the two echo signals is very strong...
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IPC IPC(8): G01S7/41
CPCG01S7/41
Inventor曹运合李春阳吴春林龚作豪凤宏晓王从思
Owner西安雷擎电子科技有限公司