一种水下直接序列扩频信号参数估计方法及设备
By demodulating, low-pass filtering, differentiating, and taking absolute values of underwater direct sequence spread spectrum signals, the power spectrum is calculated, solving the problem of low accuracy in estimating pseudocode period and chip width in existing technologies, and achieving higher accuracy estimation.
CN117335835BActive Publication Date: 2026-07-17HARBIN ENG UNIV
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- HARBIN ENG UNIV
- Filing Date
- 2023-10-19
- Publication Date
- 2026-07-17
AI Technical Summary
Technical Problem
Existing methods have low accuracy in estimating the pseudocode period and chip width of underwater direct sequence spread spectrum signals.
Method used
An underwater direct sequence spread spectrum signal parameter estimation method is adopted, which includes demodulation using an orthogonal receiver, low-pass filtering, differentiation and absolute value operations, and calculating the power spectrum to estimate the chip rate and pseudo-code period.
Benefits of technology
It improves the estimation accuracy of pseudocode period and chip width, and the estimation method is simple and effective.
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Abstract
一种水下直接序列扩频信号参数估计方法及设备，它属于水声扩频信号参数估计领域。本发明解决了现有方法对伪码周期和码片宽度估计的精度低的问题。本发明采取的技术方案为：步骤1、利用正交接收机对接收的水下直接序列扩频信号进行解调，获得基带信号；步骤2、对基带信号进行低通滤波后，得到滤波后的信号；对滤波后的信号进行求导，再对求导结果进行取绝对值操作，得到取绝对值后的结果；步骤3、计算取绝对值后结果的功率谱SY(f)，再根据功率谱估计码片速率，并根据码片速率计算出码片宽度；步骤4、计算SY(f)的功率谱得到伪时域波形，并提取伪时域波形的谱线位置后，相邻谱线峰值之间的间隔即为伪码周期。本发明方法可以应用于水声扩频信号参数估计。
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