Near-constant modulus band-limited random noise waveform modulation method
A technology of random noise and modulation method, which is applied in the field of waveform modulation and near-constant modulus band-limited random noise waveform modulation, and can solve the problem of low peak-to-average ratio
Pending Publication Date: 2021-02-19
NAT UNIV OF DEFENSE TECH
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Problems solved by technology
The waveform modulation method proposed by the invention can provide a band-limited random noise waveform with an extremely low peak-to-average ratio and approximately constant modulus for the noise radar, so that the noise radar waveform is not limited to the linear range of the device during the amplification process, and the maximum The amplification gain of , which solves a major engineering problem in the modulation of noisy radar waveforms
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[0030] Such as figure 1 As shown, the present invention is a near-constant modulus band-limited random noise waveform modulation technique, comprising the following steps:
[0031] S1. Since different radar systems have different requirements for the peak-to-average ratio of radar waveforms, in actual engineering practice, it is necessary to set the peak-to-average ratio conditions that the waveform needs to achieve according to the requirements. The peak-to-average ratio of the waveform is required to be less than or equal to γ (γ > 2) , that is, the peak-to-average ratio threshold is γ.
[0032] S2. Assume that the timing of the noise radar system requires the pulse waveform duration to be τ, and the center frequency point to be f 0 , the bandwidth is B, and the radar system transmits sampling rate If OFDM modulation is performed on a random sequence, the subcarrier spacing of OFDM modulation is Let the length of the random sequence be The starting position of the m...
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The invention discloses a near-constant modulus band-limited random noise waveform modulation method, which comprises the following steps of setting a threshold according to a peak-to-average ratio requirement of a band-limited random noise waveform, and randomly modulating a noise sequence on a subcarrier corresponding to a preset bandwidth of a frequency domain by using a multi-carrier quadrature modulation mode, namely an OFDM mode to generate the band-limited random noise waveform without peak-to-average ratio suppression, calculating a peak-to-average ratio, judging whether the peak-to-average ratio needs to be optimized or not according to a threshold, recording a peak value, a peak value point and a peak value symbol of the band-limited random noise waveform after entering an optimization step, and then determining an optimization coefficient according to the peak-to-average ratio, generating a random frequency point sine waveform according to the optimization coefficient, carrying out phase shift according to the phase corresponding to the peak point to generate a sine optimization waveform, and carrying out peak-to-average ratio optimization on the band-limited random noise waveform by using the sine optimization waveform, and performing peak-to-average ratio threshold judgment on the optimized band-limited random noise waveform, and if the peak-to-average ratio reaches a threshold requirement, outputting a waveform meeting the peak-to-average ratio threshold requirement as a near-constant modulus band-limited random noise waveform.
Description
technical field [0001] The invention belongs to the field of noise processing and relates to a waveform modulation technology, in particular to a near-constant modulus band-limited random noise waveform modulation method. Background technique [0002] Compared with conventional radar, noise radar has stronger anti-reconnaissance and anti-interference ability, but the design of low peak-to-average ratio band-limited random noise waveform is a major problem in the waveform design of noise radar. Due to the limitation of the dynamic range of hardware equipment such as digital-to-analog converters and power amplifiers, the passage of large peak-to-average ratio waveforms will cause large waveform distortion, especially for power amplifier devices. For amplification, the power amplifier device is often placed in the saturation region to work. Therefore, it is often required that the waveform must have a low peak-to-average ratio, or even a constant modulus waveform, such as a sin...
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IPC IPC(8): G01S7/36
CPCG01S7/36
Inventor 刘方正韩振中曾瑞琪潘继飞姜秋喜
Owner NAT UNIV OF DEFENSE TECH