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Waveform optimization method based on target cognition and transmitted power distribution

A transmission power and waveform optimization technology, applied in the radar field, can solve the problem that the algorithm is difficult to directly apply to the broadband cognitive radar system

Active Publication Date: 2013-09-25
XIDIAN UNIV
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Problems solved by technology

Therefore, these algorithms are difficult to directly apply to wideband cognitive radar systems

Method used

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  • Waveform optimization method based on target cognition and transmitted power distribution
  • Waveform optimization method based on target cognition and transmitted power distribution
  • Waveform optimization method based on target cognition and transmitted power distribution

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Embodiment Construction

[0049] refer to figure 1 , the implementation steps of the present invention are as follows:

[0050] Step 1: Construct a signal model for the optimal design of broadband cognitive radar waveforms:

[0051] (1.1) Assuming that the signal f(t) with finite duration and bandwidth is irradiated on the target and clutter, the signal model is as figure 2 As shown, the signal r(t) received by its radar is expressed as:

[0052] r(t)=s(t)+x(t)

[0053] Among them, s(t) is the target echo, x(t) is an intermediate variable, x(t)=c(t)+n(t), c(t) is clutter, Symbols in the formula Represents linear convolution, q(t) is the target impulse response, q c (t) is the clutter impulse response, n(t) is the generalized stationary Gaussian noise;

[0054] (1.2) Transform the formula into the frequency domain, then the radar received signal is expressed as:

[0055] R(ω)=Q(ω)F(ω)+X(ω)

[0056] Where Q(ω) and F(ω) represent the Fourier transform of the target impulse response q(t) an...

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Abstract

The invention discloses a waveform optimization method based on target cognition and transmitted power distribution, which mainly solves the problem that the current waveform optimization algorithm is not suitable for a broadband radar. The method comprises the following steps of: (1) building a waveform-optimized signal model of a cognitive radar of a broadband; (2) utilizing a single echo to estimate the power spectral density of a target; (3) calculating the transmitted power of a transmit signal being a linear frequency modulation signal to be used as a constrained initial value of the transmitted power; (4) constructing a cost function; (5) solving the cost function; (6) optimally setting the power spectral density of transmitted waveform corresponding to the transmitted power; (7) calculating the related coefficient of the estimated value and the true value of the power spectral density of the target corresponding to the optimized waveform; (8) and judging and outputting the power spectral density of the transmitted power and the transmitted waveform according to whether the related coefficient meets the requirements. According to the method, the transmitted waveform optimization and power distribution of a cognitive radar system of the broadband can be realized, and the efficiency and overall performance of the system are increased.

Description

technical field [0001] The invention belongs to the technical field of radar and relates to a waveform optimization method, which can be used for waveform optimization and transmission power distribution aimed at target recognition. Background technique [0002] With the continuous improvement of the informatization and intelligence of high-tech weapons, the requirements for radar in modern warfare are also getting higher and higher. Modern warfare requires radars to have longer detection distances, higher tracking accuracy, more accurate target recognition capabilities, stronger anti-jamming capabilities, and faster response speeds. Modern radars not only have to face the traditional "four resistances" problems, that is, anti-radiation missiles, anti-stealth, anti-low-altitude penetration and anti-electronic interference, but also have the comprehensive ability to integrate multiple working modes and handle multiple targets and tasks. Therefore, modern radars need to meet ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/02G01S7/41
Inventor 纠博刘宏伟靳标周生华苏涛杨虎军
Owner XIDIAN UNIV
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