Dynamic programming tracking before detection method for moving platform radar with motion compensation search
A motion compensation and dynamic programming technology, applied in measurement devices, radio wave measurement systems, radio wave reflection/re-radiation, etc., can solve the problem that the secondary discretization is no longer accurate, the measurement information is not fully utilized, and the value function is updated. Manipulate problems such as redundant computation to reduce computational burden, enhance detection and tracking performance, and reduce computational effort
Active Publication Date: 2020-09-18
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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On the one hand, because the entire state space is discretized with the same standard, and the measurement space at different times has different discretization standards, the position of the trace is no longer accurate due to the second discretization, and may cause different measurement The cells are mapped in the unified state cells, which leads to the problem of insufficient utilization of measurement information; on the other hand, although the state space selected by the algorithm covers all measurement airspaces and reduces the size of the airspace as much as possible, it still covers Some airspaces without measurement data, the value function update operation in this airspace can be regarded as redundant calculation
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[0033] In order to describe content of the present invention conveniently, at first the following terms are explained:
[0034] Absolute geodetic coordinate system: the origin and coordinate axis are absolutely unchanged and do not change with the movement of the carrier; the coordinates in this coordinate system represent the absolute position of the dot trace on the earth.
[0035] Fuselage coordinate system: the origin is located at the center of mass of the aircraft, the x-axis is the axis of the fuselage, the direction of the nose is the positive direction of the x-axis; the z-axis is perpendicular to the plane where the fuselage is located; the y-axis is determined by the right-handed spiral rule. The coordinate system changes with the movement and rotation of the carrier, the position of the origin and the orientation of the coordinate axes. The coordinates in this coordinate system represent the relative position of the trace with respect to the carrier aircraft.
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The invention discloses a dynamic planning detection-before-detection tracking method of a moving platform radar with motion compensation search, which is applied in the field of radar target detection, and aims to solve the problem of difficult determination of discretized state space caused by measurement grid mismatch under a moving platform; The present invention first uses a time-varying measurement grid method to discretize the entire state space, and then uses the method of coordinate system change to calculate the position of the state cell in the absolute geodetic coordinate system, and then pushes back the previous frame according to the search speed possible positions, and finally calculate the effective state space range of the search according to the motion compensation, so as to complete the value function accumulation process in the dynamic programming detection tracking algorithm under the moving platform; in the case of low calculation amount and high tracking accuracy, the present invention The scheme makes the dynamic programming tracking before detection algorithm applicable to the moving platform radar, and greatly improves the detection and tracking performance of the radar for weak targets.
Description
technical field [0001] The invention belongs to the field of radar target detection, in particular to a multi-frame detection-before-tracking technology for weak targets by a moving platform radar. Background technique [0002] Compared with ground-based radar, airborne mobile platform radar has many advantages in modern military warfare because of its advantages in platform height and maneuverability. On the one hand, the elevation of the radar reduces the influence of the curvature of the earth and terrain occlusion, making the radar's surveillance area wider; on the other hand, placing the radar on an aircraft that can move flexibly can improve the survival rate of the radar in combat. Today, the early warning aircraft has become an important symbol of military informatization, the nerve center of the entire combat system of modern warfare, and has broad development prospects. [0003] The current radar target detection technology is facing severe challenges. For exampl...
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IPC IPC(8): G01S13/66G01S7/41
Inventor 杨晓波库飞龙徐龙潇付玲枝易伟李武军孔令讲
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA