Generating and compression method for multi-frequency-scan radar signals

A technology of sweeping frequency signals and radar signals, which is applied in the field of radar detection, can solve the problems of high power density and low spectrum utilization rate, and achieve the effects of reducing power density, efficient spectrum utilization rate, and accurate target speed and distance

Inactive Publication Date: 2013-09-18
WUHAN UNIV
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Problems solved by technology

[0005] Aiming at the problems existing in the background technology, the present invention provides a method for generating and compressing multi-sweep radar signals, which mainly solves the problems of excessive power density in the time-frequency domain of radar signals and low frequency spectrum utilization

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  • Generating and compression method for multi-frequency-scan radar signals
  • Generating and compression method for multi-frequency-scan radar signals
  • Generating and compression method for multi-frequency-scan radar signals

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Embodiment Construction

[0035] The application of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0036] image 3 It is a functional block diagram of a multi-sweep signal generation method, which is divided into the following steps:

[0037] 1) Use CORDIC to generate a single constant amplitude sweep signal g 1 digital signal g 1 (n);

[0038] 2) Determine the time interval t of the multi-sweep signal according to actual needs b , and put g 1 (n) cyclic shift (m-1)t b (1≤m≤M) time length, forming M frequency-sweeping digital signals g m (n);

[0039] 3) Adding M frequency sweep signals in the digital domain to obtain time and frequency simultaneous multiplexing of multi-frequency sweep signals g ( n ) = Σ m = 1 M g m ...

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Abstract

The invention discloses a generating and compression method for multi-frequency-scan radar signals. The generating method for the multi-frequency-scan radar signals is provided based on the idea that power density of signals on a time frequency domain is reduced as mush as possible. A single frequency scan signal circumferential displacement and stacking method is utilized to generate time frequency simultaneous multiplex frequency scan signals, the multi-frequency-scan signals are generated, and frequency-scan signals are multiplexed simultaneously in time and frequency in one single pulse time period. The multi-frequency-scan signals of frequency multiplexing are utilized to conduct matched filtering, subsection accumulation is then conducted to obtain distance resolution in negative proportion with bandwidth and signal to noise ratio of a single compressed frequency-scan signal under same energy condition, and secondary compression of the multi-frequency-scan signals is achieved. The signals generated by the methods have high spectrum efficiency and low intercepted probability, and distance resolution and detection distance of the radar are guaranteed.

Description

technical field [0001] The invention belongs to the technical field of radar detection, in particular to a method for generating and compressing multi-sweep radar signals. Background technique [0002] The radar system mainly transmits electromagnetic wave energy to the target, and then measures the echo delay and Doppler frequency shift to obtain the distance and speed information of the target. Simple pulse radar can obtain good transceiver isolation, but there is a contradiction between distance resolution and maximum detection distance. In order to achieve a higher distance resolution, it is necessary to reduce the pulse width and increase the emission energy to ensure the maximum detection distance. In this way, the signal power in a very short period of time is very large, which not only makes it more difficult to implement the transmitter, but also has a serious impact on the surrounding electromagnetic environment. Pulse compression technology is a technology that ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/28
CPCG01S7/282G01S7/288G01S13/282G01S7/2883
Inventor 文必洋谭剑李柯田应伟王才军
Owner WUHAN UNIV
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