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Homotype radar same frequency interference suppression method used for ship formation condition

A technology of co-frequency interference and formation, which is applied to the same-type radar co-frequency interference suppression, and the suppression of co-frequency interference between chirp radars, which can solve the problems of poor suppression effect and so on.

Inactive Publication Date: 2013-05-22
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

[0008] The present invention aims at the same-frequency asynchronous interference generated when the ship-borne LFM pulse system radar formation works. In the prior art, the suppression effect is not good under the conditions of large amount of interference, interference echo signal and receiving matching filter, etc., In the case of a naval formation, a method combining fractional Fourier transform domain filtering processing and time domain anti-asynchronous processing is proposed to realize the same-type radar co-frequency interference suppression method

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  • Homotype radar same frequency interference suppression method used for ship formation condition
  • Homotype radar same frequency interference suppression method used for ship formation condition
  • Homotype radar same frequency interference suppression method used for ship formation condition

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Embodiment

[0087] For LFM pulse radar signals, the input signal bandwidth of the receiver is about 5MHz, and the signal is sampled at a sampling rate of 10MHz. The parameters of target echo and interference are shown in Table 1.

[0088] Table 1 Delay simulation parameters

[0089]

[0090] Assume that the power of noise is σ 2 , The signal-to-noise ratio can be obtained based on the echo signal power and noise power, where the signal-to-noise ratio refers to the input signal-to-noise ratio with the echo signal bandwidth as a reference, and the signal-to-noise ratio is set as SNR.

[0091] A method for suppressing the same-frequency asynchronous interference of the same type radar in the case of ship formation, the specific implementation steps are as follows:

[0092] 1) Select 11 pulse repetition period data with a sampling rate of 10MHz / s and 10,000 points per period. Perform traditional pulse compression processing and MTD processing on these data. The processing results are as attached Fig...

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Abstract

The invention relates to a homotype radar same frequency interference suppression method used for a ship formation condition, and belongs to the technical field of radar interference resistance. When an inner radar is formed to conduct cooperative work, under the known condition of a working parameter, firstly, according to the feature that a linear frequency modulation (LFM) interference signal focuses in a fractional order Fourier field of a matching order and defocuses in a fractional order Fourier field of other orders, by the method of gradually filtering, interference which is different from frequency of a radar transmitting signal to be transmitted is sequentially eliminated by interference energy from big to small. Secondly, a signal after frequency domain processing is reversely transformed into a time domain to conduct matched filtering, and interference which is the same with frequency of an echo signal is filtered by using time domain adjacent period anti-asynchronous arithmetic. The homotype radar same frequency interference suppression method used for the ship formation condition effectively solves the problem of same frequency interference suppression different from the radar echo signal frequency, and simultaneously further eliminates the same frequency interference same with the radar echo signal frequency, improves anti-same-frequency interference ability and formation and networking ability of a ship-based homotype radar.

Description

Technical field [0001] The invention belongs to the technical field of radar anti-jamming, and relates to a method for suppressing co-frequency interference of the same type radar in the case of ship formation, and specifically relates to a method for suppressing co-frequency interference between chirp system radars in the case of ship formation. To improve the formation radar network capability. Background technique [0002] Most of the current shipboard radars are LFM (Linear Frequency Modulation) pulse system radars. Under the condition that the peak power of the transmitter is limited, the radar of this system makes full use of the average power of the transmitter to better solve the contradiction between the radar range and the range resolution, which is difficult to solve in the common pulse system radar. The signal processing gain. [0003] In warship formation operations, due to the different characteristics of detection targets, the requirements for detection range and d...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/36
CPCG01S7/023
Inventor 陶然李元硕郇浩
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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