Cognitive radar optimal waveform design method suitable for parameter estimation

Abstract

The invention discloses a cognitive radar optimal waveform design method suitable for parameter estimation. The cognitive radar optimal waveform design method suitable for parameter estimation comprises the steps of building a channel model by use of actual target impulse response more consistent with the actual situation, and obtaining the energy spectrum density of the desired waveform by use of a water injection method according to the channel model so that the maximum target information quantity can be obtained from echo, taking the energy spectrum density and time-domain complex waveform amplitude as constant constraint conditions and obtaining the time-domain complex waveform of constant amplitude by use of an iteratively weighted least square method without wasting the power of a transmitter, next, transmitting the designed time-domain complex waveform by use of a radar to obtain target echo and performing parameter estimation by use of the target echo, after the expiry of the accumulated time of estimation of one parameter, updating the target impulse response by use of the current target echo and carrying out waveform design and transmission again so that the waveform transmitted at present changes along with the change of the target and the environment, and guaranteeing that the target echo obtained at present always contains the maximum target information quantity so that target parameter estimation can be carried out favorably.

Description

Technical field [0001] The invention relates to the research field of cognitive radar waveform design, in particular to a method for designing cognitive radar optimal estimated waveforms. Background technique [0002] Cognitive radar gives the radar system the ability to perceive the environment, understand the environment, learn, reason and make decisions, so that the radar system can adapt to the complex and changeable electromagnetic environment, thereby improving the performance of the radar system. The main feature of cognitive radar is the introduction of a closed-loop radar system, which includes two parts: knowledge assistance and adaptive waveform design. Radar obtains target information through target echo signal processing, and different transmitted waveforms will cause different target information in the target echo. For cognitive radar, it is reflected in the use of optimal waveforms that match the observation angle for different targets. , Thereby improving radar p...

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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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