Main petal suppression interference inhibitory method based on the frequency distribution MIMO radar
A suppressive interference and frequency diversity technology, applied in the field of radar, can solve the problems of interference suppression ability reduction and failure, and achieve the effect of reducing processing complexity
Active Publication Date: 2018-05-04
XIDIAN UNIV
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However, the above methods are all designed according to the time domain, frequency domain or time-frequency domain structural characteristics of the interference signal, and have strong interference type specificity
When the interference type is mismatched, its interference suppression capability will be reduced or even invalid
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[0036] refer to figure 1 , the specific implementation steps of the present invention are as follows:
[0037] Step 1: Obtain the echo data of the MIMO radar receiving array and auxiliary antenna according to the transmitting signal of the MIMO radar transmitting array.
[0038] The transmitting signal of the MIMO radar transmitting array is X(t)=[x 1 (t),...,x m (t),...,x M (t)], wherein, t=1,..., T, T is the number of sampling points, m=1,..., M, M is the number of elements of the MIMO radar transmitting array;
[0039] 1a) According to the signal X(t) transmitted by the MIMO radar transmitting array, the echo data Y(t) of the MIMO radar receiving array is obtained:
[0040] Y(t)=x r (t)+x j (t)+n(t),
[0041] in, is the target echo signal received by the MIMO radar receiving array, τ m =f 0 d T sinθ+m·Δf·2r is the time delay in the target propagation process, f 0 is the operating frequency of the MIMO radar, d T is the interval between the transmitting array ...
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The invention discloses a main lobe oppressive interference suppression method based on frequency diversity MIMO radar mainly to solve the problem that main lobe oppressive interference is suppressed according to the signal position and the target detection performance is low in the prior art. The method is implemented by the steps as follows: (1) generating an MIMO radar transmitting signal, and getting MIMO radar receiving array echo data and auxiliary antenna echo data; (2) performing matched filtering on the MIMO radar receiving array echo data and the auxiliary antenna echo data respectively to get receiving array antenna filter data r and auxiliary antenna filter data f; (3) compensating the auxiliary antenna filter data f to get compensated data f'; (4) cancelling the receiving array antenna filter data r and the compensated auxiliary antenna data f' to get cancelled data yr; (5) calculating a pattern beam-formed by the MIMO radar receiving array according to the cancelled data yr; and (6) observing the pattern to judge whether there is a target detected. Main lobe oppressive interference can be suppressed effectively. The method can be used in target detecting and tracking.
Description
technical field [0001] The present invention relates to the field of radar technology, in particular to a main lobe suppression interference suppression method, which can be used in a frequency diversity MIMO radar system to effectively suppress suppression interference signals entering from the main lobe of a frequency diversity MIMO radar antenna and improve frequency diversity Target detection performance of MIMO radar under suppressed mainlobe jamming conditions. Background technique [0002] Suppressive interference is the electronic interference that uses the interference signal obtained by noise to cover or submerge the useless signal, so that the useful signal received by the receiving electronic equipment is blurred or completely covered, so that it cannot work normally. Suppression interference is divided into active suppression interference and passive suppression interference. Active suppressive jamming is divided into targeting jamming and blocking jamming; pas...
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IPC IPC(8): G01S7/36
CPCG01S7/36
Inventor 张林让郭玉梅李升远刘楠
Owner XIDIAN UNIV