Radar target locating method based on multipath utilization

A radar target and positioning method technology, applied in the radar field, can solve the problems of complex processing, high cost, false detection, etc., and achieve the effect of simple model, low cost, and accurate detection position

Active Publication Date: 2018-04-17
XIDIAN UNIV
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Problems solved by technology

However, the scope of use of these methods is limited, and there are strict requirements on the accuracy of the arrival time of different paths, and they are only suitable for multipath environments with short delays.
At the same time, the receiving antenna is affected by multipath signals, and the radar will detect multiple false targets by mistake, and there are problems of high cost, complicated processing, and small application range

Method used

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  • Radar target locating method based on multipath utilization
  • Radar target locating method based on multipath utilization
  • Radar target locating method based on multipath utilization

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Embodiment Construction

[0034] refer to figure 1 , the implementation steps of the present invention are as follows:

[0035] Step 1: Obtain radar echo data.

[0036] radar transmissions t (t), get the echo data as s r (t):

[0037]

[0038] in is the convolution symbol, h k (t) is the direct wave channel transmission response function, h k '(t) is the multipath channel transmission response function, n(t) is the receiver noise signal, which can be regarded as Gaussian white noise signal.

[0039] Step 2: Obtain the time of arrival of different paths according to the echo data.

[0040] For the received echo data s r (t) Perform matched filtering to obtain the arrival time τ of different paths A , τ B , τ AB , where τ A is the arrival time of the direct wave, τ B is the time of arrival of the second-order multipath, τ AB Time of arrival for first-order multipath.

[0041] Step 3: Establish the radar target geometric positioning model.

[0042] refer to figure 2 , define a monost...

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Abstract

The invention discloses a radar target locating method based on multipath utilization, and mainly aims at solving the problem that a radar point target cannot be located accurately in the multipath environment in the prior art. The method is realized by the steps that 1) an emission signal is generated to obtain echo data; 2) the echo data is processed to obtain time of arrival (TOA) of differentpaths; 3) a geometric location model of a radar target is obtained; 4) the obtained TOA of different paths are substituted into the established geometric location model; 5) an initial searching pointis initialized; 6) the geometric location model and the initial searching point are input to a searching function lsqnonlin, and the searching function lsqnonlin is used to obtain an accurate target position by searching; and 7) the target position obtained by searching is expanded to a 3D space. According to the method, multipath information can be utilized effectively, the established geometriclocation model is simple, the cost is lower, the location precision is improved, and the method can be used to locate low-altitude point targets.

Description

technical field [0001] The invention belongs to the technical field of radar, and in particular relates to a target positioning method, which can be used for positioning low-altitude point targets. Background technique [0002] In a multipath environment, when using radar to locate a point target, due to the reflection of electromagnetic waves by the ground, sea and surrounding environment, the echo signal returned from the target reaches the radar antenna through different paths, resulting in multipath effect. The existence of multipath effect reduces the accuracy of radar target positioning, and even creates false targets. Generally speaking, for a point target with a large elevation angle, the multipath component enters from the sidelobe of the radar antenna, and the monopulse radar can be positioned with high precision at this time. However, for low-elevation point targets, due to multi-path signals entering the sum and difference main beams, large positioning errors wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/41
CPCG01S7/41
Inventor 张娟王梦娜张林让刘楠周宇
Owner XIDIAN UNIV
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