Multi-target interference signal generation method based on digital channelization frequency storage

Abstract

The invention discloses a multi-target interference signal generation method based on digital channelized frequency storage. The method comprises the following steps: S1, enabling a radio frequency signal received by a first antenna to pass through a down-conversion local oscillator circuit to generate an intermediate frequency signal; S2, generating a baseband signal after the intermediate-frequency signal passes through an intermediate-frequency microwave module; S3, inputting the data into an A / D conversion chip for digitalization, and realizing fine measurement and storage of baseband signals, namely digital frequency storage, of the digitalized data through an FPGA; S4, making an interference decision by using a digital frequency storage result, and generating and outputting a corresponding interference time sequence; S5, completing digital-to-analog conversion of the signal through a D / A converter, and generating an intermediate-frequency interference signal to be transmitted through an intermediate-frequency microwave module; and S6, processing the intermediate-frequency interference signal to be transmitted through the up-conversion local oscillator circuit, and transmitting the intermediate-frequency interference signal through the second antenna. According to the invention, detection and interference on multiple targets can be realized, the number of hardware channels is reduced, the resource utilization rate is improved, the cost is reduced, and the size and the weight are reduced.

Description

technical field [0001] The invention relates to the technical fields of radar countermeasures, radar reconnaissance and radar signal interference, in particular to a method for generating multi-target interference signals based on digital channelized frequency storage. Background technique [0002] Early radar reconnaissance and jamming systems usually use zero intermediate frequency and digital storage frequency technology (DRFM), the principle is as follows image 3 As shown, the principle is to down-convert the radio frequency signal received by the antenna through a microwave module to generate a baseband signal, and input it to a high-performance A / D (analog-to-digital) conversion chip for digitization. The digitized high-speed data is further digitally processed through the on-chip resource-rich FPGA to realize fine measurement and storage of baseband signals, that is, digital frequency storage. The result of digital frequency storage is used to make interference decis...

AI Technical Summary

Problems solved by technology

Since the sampling bandwidth of suitable AD chips on the market is less than 2GHz, figure 1 The radar reconnaissance and jamming system in China can no longer meet the needs of instantaneous coverage of the entire frequency band

Integrating digital channelization technology into traditional radar reconnaissance and jamming systems, such as Figure 4 As shown, the IF signals of different channels are moved to the baseband through the hardware circuit, and multiple frequency storage boards are used for DRFM processing, and then different channels are selected to be moved to the IF transmission, which can greatly make up for the problem of narrow instantaneous bandwidth of the early radar reconnaissance jamming system. It can realize the detection and interference of multiple radar signals and adapt to the high-bandwidth and multi-target requirements of modern radar countermeasures. This solution achieves frequency expansion and detection and interference of multiple radar targets by multiplying hardware resources. Low resource utilization, high overall cost, large volume and weight, especially unsuitable for airborne radar reconnaissance and jamming systems

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