FDA range ambiguity clutter suppression method based on main lobe correction
A distance ambiguity and clutter suppression technology, applied in radio wave measurement systems, instruments, etc., can solve problems such as different, difficult to improve radar detection performance, and pollution of radar observable areas
Pending Publication Date: 2021-09-10
XIDIAN UNIV
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Problems solved by technology
[0004] However, in the case of forward-looking array, radar clutter has distance dependence, that is, the distribution characteristics of clutter are different with different distances. Therefore, fuzzy and non-uniform clutter is an important problem faced by airborne forward-looking array radar. Above, under the high repetition frequency pulse system, the clutter echoes in the ambiguous areas with different distances will overlap when the radar enters the steady state operation
The clutter of the airborne forward-looking array radar system is distance-dependent, and the clutter in different areas has different distribution characteristics. The range-ambiguous clutter overlaps with each other, which will seriously pollute the radar observable area. Therefore, it is difficult to improve the radar detection performance by using the STAP method.
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Embodiment 1
[0046] See figure 1 , figure 1 It is a schematic structural diagram of an FDA distance ambiguity clutter suppression method based on main lobe correction provided by an embodiment of the present invention. The present embodiment proposes a method for suppressing FDA range ambiguity clutter based on main lobe correction, which includes the following steps:
[0047] Step 1. Establish a signal model, and obtain radar echo signals according to the signal model.
[0048] Specifically, see figure 2 , figure 2 The schematic diagram of the geometric configuration of the airborne forward-looking FDA-MIMO radar provided by the embodiment of the present invention, the coordinate axes xyz are perpendicular to each other to form a space coordinate system, the movement speed direction of the platform is consistent with the y-axis direction of the coordinate system, and the height is H, The radar antenna is a one-dimensional equidistant linear array with a front side view, and the arra...
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The invention discloses an FDA range ambiguity clutter suppression method based on main lobe correction. The method comprises the steps of building a signal model, and obtaining a radar echo signal according to the signal model; constructing a distance phase compensation steering vector, and performing first compensation processing on the radar echo signal according to the distance phase compensation steering vector to obtain a first echo processing signal; constructing a correction reduction compensation vector corresponding to the main lobe correction weight, and performing reduction compensation processing on the first echo processing signal according to the correction reduction compensation vector to obtain a compensation reduction signal; and selecting any transmitting array element data in the compensation reduction signal to obtain a dimension reduction compensation signal, and performing second compensation processing on the dimension reduction compensation signal to realize radar range ambiguity clutter suppression. According to the method, main lobe motion correction is carried out at a radar transmitter to carry out recovery compensation, signals of different range ambiguity regions can be distinguished by utilizing the range coupling characteristic of FDA signal echoes, and range ambiguity clutters are suppressed through compensation.
Description
technical field [0001] The invention belongs to the technical field of radar signal processing, and in particular relates to an FDA range ambiguity clutter suppression method based on main lobe correction. Background technique [0002] Airborne phased array radar uses high-altitude aircraft as the carrier, and has the advantages of wide monitoring range and long warning time for low-altitude targets. Modern incoming targets often conduct military strikes through maneuvering flight, which poses a serious threat to the national defense system. How to timely and effectively realize the detection and early warning of maneuvering targets is a major challenge for future radar surveillance systems. [0003] As a common array structure of airborne radar, the forward-looking array has a distance-dependent clutter distribution, and the number of independent and identically distributed training samples is usually limited, which affects the radar target detection performance. The groun...
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IPC IPC(8): G01S7/41
CPCG01S7/414G01S7/418G01S7/411Y02A90/10
Inventor 朱圣棋王宇卓王可许京伟兰岚贺雄鹏
Owner XIDIAN UNIV