A Ranging and Velocity Measurement Method Combined with Hyperbolic Frequency Modulation and Linear Frequency Modulation

A technology of linear frequency modulation and hyperbolic frequency modulation, which is applied in the field of signal processing, can solve the problems of high cost and other problems, and achieve the effect of solving the problem of speed measurement and accurate distance measurement

Active Publication Date: 2022-07-29
QINGDAO AGRI UNIV
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Problems solved by technology

The traditional speed measurement method is to calculate the speed through a set of narrowband filter banks based on the radial velocity of the target relative to the sonar. The higher the accuracy of the speed measurement, the more the number of Doppler filter banks needs to be multiplied. This method the cost is too high

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  • A Ranging and Velocity Measurement Method Combined with Hyperbolic Frequency Modulation and Linear Frequency Modulation
  • A Ranging and Velocity Measurement Method Combined with Hyperbolic Frequency Modulation and Linear Frequency Modulation
  • A Ranging and Velocity Measurement Method Combined with Hyperbolic Frequency Modulation and Linear Frequency Modulation

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Embodiment Construction

[0035] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. A positive and negative linear frequency modulation signal ranging and speed measurement method, such as figure 1 As shown, the method includes the following steps:

[0036] S1) Suppose the target moves towards the sonar system, and its movement speed v is positive.

[0037] S2) First, a hyperbolic FM HFM signal is transmitted, and then a linear FM LFM signal is transmitted. The HFM signal and the LFM signal have no size relationship constraints on their respective transmission start and stop frequencies, and the frequency bands and pulse widths of the two signals are independently set.

[0038] The HFM signal and the LFM signal have no size relationship constraints on the starting and ending frequencies of their respective transmissions, which refers to f h0 with f h1 There is no size relationship limit between them, that is, f h0 >= f h1 wit...

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Abstract

The invention relates to a combined hyperbolic frequency modulation (HFM) and linear frequency modulation (LFM) ranging and speed measurement method, which mainly includes the following steps: 1) the target moves towards the sonar direction; 2) firstly, an HFM signal is transmitted, and then an LFM signal is transmitted. The starting and ending frequencies of HFM and LFM have no size relationship constraints, and the frequency bands and pulse widths of the two signals are independently set; 3) Find the time when the maximum value of the matched filter of the two signals appears respectively; 4) Use the HFM signal and The time-delay relationship of the LFM signal to calculate the distance and target velocity between the target and the sonar system. This method utilizes HFM+LFM combined signal speed measurement and ranging, eliminates the ranging error existing when a single HFM signal and a single LFM signal are ranging, and improves the speed and ranging accuracy. The parameters of HFM and LFM can be set independently, and it has more The flexible signal combination mode reduces computing costs and supports engineering applications.

Description

technical field [0001] The invention relates to the technical field of signal processing, in particular to a distance and speed measurement method combining hyperbolic frequency modulation and linear frequency modulation. Background technique [0002] Before the appearance of pulse compression, detection distance and resolution were a pair of irreconcilable contradictions in waveform design. The two can only be chosen as a compromise. The appearance of pulse compression solves this problem very well. In a large number of pulse compression signals , Linear Frequency Modulation (Linear Frequency Modulation, LFM) signal is particularly welcomed by signal designers because of its unique advantages and good pulse compression performance. [0003] Advantages of LFM include: [0004] 1) LFM has a certain Doppler tolerance, which is conducive to low-speed target detection; [0005] 2) LFM is a constant amplitude signal, which is beneficial to improve the transmission efficiency of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S15/50G01S15/58
CPCG01S15/50G01S15/586G01S15/104G01S15/08
Inventor 宋彩霞
Owner QINGDAO AGRI UNIV
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