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Interference machine for resisting pulse Doppler radar and interference method thereof

A pulsed Doppler and jammer technology, applied in radio wave measurement systems, instruments, etc., can solve the problems of poor jamming effect, inability to obtain PD radar coherent processing gain, large jamming power, etc., to reduce volume and power consumption. Effect

Active Publication Date: 2021-07-09
NANJING INST OF TECH +1
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

The current PD radar interference mostly adopts noise interference technology. The noise interference technology obtains the radar signal frequency through rough frequency measurement of the radar signal, and then independently generates narrow-band targeting interference and broadband blocking interference. Noise interference cannot obtain coherent processing of PD radar. Gain, requires a large interference power, and the interference effect is poor

Method used

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  • Interference machine for resisting pulse Doppler radar and interference method thereof
  • Interference machine for resisting pulse Doppler radar and interference method thereof
  • Interference machine for resisting pulse Doppler radar and interference method thereof

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Embodiment Construction

[0029] The structure diagram of pulse Doppler radar is as follows: figure 1 As shown, the pulse coherent transmitter of the PD radar generates a series of phase-stable pulses under the control of the main frequency, and the radar signal is transmitted through the duplexer and the antenna. The radar target echo lags behind the transmitted signal in the time domain, and the received signal modulates the Doppler signal in the frequency domain; the radar receiver receives the target echo, which is processed by a set of narrow-band filters tuned to the signal, and the The signals are coherently accumulated to extract information such as target distance and movement speed. In search mode, the receiver uses contiguous Doppler filter banks to cover the velocity band of interest to extract a specific target, once the target is intercepted, only one filter is needed for target tracking.

[0030] PD radar can be divided into three categories according to the pulse repetition frequency c...

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Abstract

The invention provides a jammer for resisting a pulse Doppler radar and a jamming method of the jammer and belongs to the technical field of electronic countermeasures. The jammer comprises a receiving antenna, a receiving front end, a coupler, a receiving channel, a digital radio frequency memory, a transmitting channel, a digital control attenuator, a power amplifier, a transmitting antenna, a single-bit receiver, an interference controller, a DDS signal generator, an interference controller and a local oscillator. According to the jammer, a broad pulse coverage jamming method is carried out on a pulse Doppler radar under a low repetition frequency characteristic, a Doppler false target jamming method is carried out on a pulse Doppler radar under a medium-high repetition frequency characteristic, jamming signals and radar signals are coherent, coherent processing gains of the radar signals can be obtained, the jammer has the characteristics of high interference efficiency, good interference effectiveness and the like.

Description

technical field [0001] The invention belongs to the technical field of electronic countermeasures, and in particular relates to a jammer against pulse Doppler radar and a jamming method thereof. Background technique [0002] Pulse Doppler radar (referred to as PD radar) is a new system radar developed on the basis of moving target display radar. This radar has the distance resolution of pulse radar and the speed resolution of continuous wave radar, and has stronger The ability to suppress clutter can distinguish the echo of moving targets in a strong clutter background. The current PD radar interference mostly adopts noise interference technology. The noise interference technology obtains the radar signal frequency through rough frequency measurement of the radar signal, and then independently generates narrow-band targeting interference and broadband blocking interference. Noise interference cannot obtain coherent processing of PD radar. Gain requires a large interference ...

Claims

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Application Information

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IPC IPC(8): G01S7/38
CPCG01S7/38Y02A90/10
Inventor 杨会军程啟华何锡点盛云龙黄启量王琦刘庆云
Owner NANJING INST OF TECH
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