A RF Hardware Time Domain Gate Circuit Based on Narrow Pulse Modulator

Abstract

The invention provides a radio-frequency hardware time domain gate circuit based on narrow-pulse modulators so as to effectively suppress environmental noise jamming finally and improve RCS (radar cross-section) measurement precision by giving consideration to high time domain resolution ratio, good time domain filtering effect and excellent passband characteristics. The radio-frequency hardware time domain gate circuit based on the narrow-pulse modulators comprises a multi-channel pulse baseband signal generation module, a first narrow-pulse modulator and a second narrow-pulse modulator, the multi-channel pulse baseband signal generation module is used for generating first baseband signals and second baseband signals, the second baseband signals are generated by taking the first baseband signals as a benchmark and by means of delaying, the first narrow-pulse modulator is used for receiving continuous-wave signals generated by a radio-frequency signal source, modulating by the first baseband signals, outputting pulse modulating signals and sending the signals through a complete machine transmitting port, and the second narrow-pulse modulator is used for receiving amplified echo signals, uses the second baseband signals for controlling on-off time and outputs target area signals.

Description

technical field [0001] The invention relates to the technical field of radar, in particular to a radio frequency hardware time domain gate circuit based on a narrow pulse modulator. Background technique [0002] The radar cross section is a physical quantity that quantitatively characterizes the intensity of the radar radiation wave scattering by the target. With the rapid development of electronic warfare, the large-scale use of stealth weapons has become a prominent feature of modern warfare. Stealth technology can effectively reduce the distance from which radar can detect targets, and has become an important means to enhance assault capabilities or protect oneself. The stealth performance of a target mainly depends on the size of its RCS (Radar Cross-Section, radar cross-section). Therefore, reducing the radar cross-section by various methods has become the main goal of researching stealth technology. With the development of stealth technology, the RCS characteristics ...

AI Technical Summary

Problems solved by technology

[0006] For the software time-domain gate, the artificial interception of time-domain data is realized by the method of mathematical operation. Although this method has better time-domain resolution, the truncation effect only through software processing will inevitably cause errors. In the frequency domain is the Gibbs effect, which causes fluctuations in the passband and stopband. Corresponding to the window function, there is a certain ripple in the passband, and the attenuation characteristics in the stopband are also limited.

Especially when the interference signal is much larger than the target echo signal, the removal effect is not ideal, which will cause a large error to the result

[0007] For the IF hardware time domain gate, since the gating switch is placed on the IF path, and the IF frequency is low, the IF bandwidth is limited, which leads to disadvantages such as the gate width cannot be set narrow enough, and the time domain resolution is poor.

This shortcoming makes it impossible to effectively remove various interference signals that are close to the target echo distance, and the practicability of the technology is not strong

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