A Simulation Method of Echo Signal of Variable Speed Target Based on Reflection Model
A technology of reflection model and simulation method, applied in the field of signal simulation, can solve the problems of inability to achieve accurate simulation of variable-speed target echo signals, phase discontinuity, etc.
Active Publication Date: 2022-03-29
SOUTHEAST UNIV
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Therefore, for broadband transmission signals, the echo signal of the moving target cannot be directly obtained by frequency offset method. At this time, the echo signal of the target can be roughly obtained by using the variable sampling method; but for the target whose moving speed changes with time, further There are serious problems such as phase discontinuity, so it is impossible to realize the accurate simulation of the echo signal of the variable speed target
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[0032] Below in conjunction with accompanying drawing, the present invention is described in further detail:
[0033] In the simulation model of the echo signal, the initial position of the target is 500m, the initial movement speed is 3m / s, and the total movement time is D=10s, which is divided into three movement stages: the first stage, movement time τ 1 = 4s, acceleration a 1 =0m / s; the second stage, movement time τ 2 = 2s, acceleration a 2 =-1m / s; the third stage, movement time τ 3 = 4s, acceleration a 3 = 0 m / s. The transmission signal of the active sonar is a linear frequency modulation signal, the pulse width is 1s, the transmission period is 5s, the lower limit frequency is 280Hz, the upper limit frequency is 320Hz, and the sampling frequency is f s =2000Hz; speed of sound in water c=1500m / s. Such as figure 1 As shown, follow the steps below to complete the target echo signal simulation based on the reflection model:
[0034] (1) According to the simulation re...
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The invention discloses an echo signal simulation method of a variable speed target based on a reflection model. Firstly, the position of the target at each discrete time point is calculated according to the set target motion parameters; secondly, the pulse width and the transmission cycle of the transmitted signal are set. ; Then, use the cubic spline interpolation to calculate the incident waves that the target touches at each discrete time point; finally, the reflected echoes at each discrete time point are time-delayed to form the received signal containing the target echo, and The zero elements in the received signal are corrected. Adopting the present invention can realize the echo signal simulation aiming at wide-band transmission signal and variable speed target, and is also applicable to the echo signal simulation of single-frequency transmission signal and static or uniform speed moving target.
Description
technical field [0001] The invention belongs to the technical field of signal simulation, in particular to an echo signal simulation method of a variable speed target based on a reflection model. Background technique [0002] In order to test the working performance of radar, active sonar and other equipment, the simulation of target echo signal is an important task. For stationary targets, the echo signal is the same as the transmitted signal except for differences in amplitude and time delay. For a moving target, in addition to the difference in amplitude and delay, the difference between the echo signal and the transmitted signal is reflected in the Doppler frequency shift: if the transmitted signal is a single-frequency signal, the echo signal frequency F 0 and transmit signal frequency f 0 The relationship is Among them, c represents the propagation velocity of the electromagnetic wave used by the radar or the sound wave used by the active sonar, and v represents th...
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IPC IPC(8): G01S7/40G01S7/52
CPCG01S7/4052G01S7/52004
Inventor 韩宁黄舒夏方世良
Owner SOUTHEAST UNIV