An optimal waveform design method for cognitive radar suitable for parameter estimation

Abstract

The invention discloses an optimal waveform design method for cognitive radar suitable for parameter estimation, which utilizes the actual target impulse response more in line with the actual situation to construct a channel model, and according to the channel model, uses the water injection method to obtain the energy spectrum of the required waveform The maximum amount of target information can be obtained from the echo; with the energy spectral density and the constant time-domain complex waveform amplitude as constraints, the iterative weighted least squares method is used to obtain the constant-amplitude time-domain complex waveform without wasting the transmitter. power; the radar transmits the designed time-domain complex waveform, obtains the target echo, and uses the target echo for parameter estimation; after the accumulation time of a parameter estimate is reached, the current target echo is used to update the target's impulse response, and the waveform design is performed again. and launch, so that the currently launched waveform changes with the changes of the target and the environment, and always ensures that the currently obtained target echo contains the largest amount of target information, which is conducive to the estimation of target parameters.

Description

technical field [0001] The invention relates to the research field of cognitive radar waveform design, in particular to a cognitive radar optimal estimation waveform design method. Background technique [0002] Cognitive radar endows the radar system with the ability to sense the environment, understand the environment, learn, reason, and judge decisions, enabling the radar system to adapt to complex and changeable electromagnetic environments, thereby improving the performance of the radar system. The main feature of cognitive radar is the introduction of a radar closed-loop system, which consists of two parts: knowledge assistance and adaptive waveform design. Radar obtains target information through target echo signal processing, and different transmission waveforms will cause different amounts of target information carried in target echoes. For cognitive radar, it is reflected in the use of optimal waveforms that match the observation angle of view for different targets....

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Problems solved by technology

[0009] 1. Usually, the impulse response of the target is unknown, and the above scheme constructs the channel model based on the given target impulse response or the target impulse response of the assumed target, which is not in line with the actual situation;

[0010] 2. The final synthesized time-domain complex waveform includes not only the amplitude but also the phase, but the current public documents either do not mention how to allocate the phase (generally not mentioned); or allocate the phase with reference to the phase of the selected reference signal , but the waveform performance and the constant amplitude performance of the time domain waveform need to be compromised (only one person)

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