Coherent duration estimation method under space-based external radiation source radar background ionized layer effect

Abstract

The invention discloses a coherent duration estimation method under a space-based external radiation source radar background ionized layer effect. The method comprises the steps of receiving an airplane target echo signal through a radar receiver, enabling the airplane target echo signal to be transmitted to an airplane target through a space-based external radiation source, and enabling the radarreceiver to be installed on a low-orbit satellite, enabling the space-based external radiation source to adopt a high-orbit satellite signal, extracting the center frequency of the airplane target byusing the airplane target echo signal, and according to the echo signal of the airplane target and the center frequency of the airplane target, calculating the coherent duration when the correlationcoefficient is reduced to a correlation threshold value according to the echo signal of the airplane target and the center frequency of the airplane target, and according to the airplane target echo signal and the center frequency of the airplane target, calculating the coherent duration when the correlation coefficient drops to the correlation threshold. The calculation method is simple, the required parameters are few, and the calculation efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of external radiation source radar, and in particular relates to a method for estimating coherence duration under the background ionosphere effect of space-based external radiation source radar. Background technique [0002] Space-based radar is an active detection method. It has the advantages of high radar station, large coverage, high positioning accuracy, and downward-looking detection, which is conducive to anti-stealth. It fills the gap in space-based aircraft detection methods. Space-based external radiation source radar is a bistatic or multistatic radar system. It does not have a transmitter itself, and needs to use other sources of radiation. There is no cooperation agreement between the receiver and the transmitter, and other radars or local sources can be used. Radar transmitters, radio or TV station transmitters, satellite TV transponders, wireless communication transmitters, etc. perform three-...

AI Technical Summary

Problems solved by technology

Compared with the ground-based receiver, the target reflection signal received by the space-based receiver will also pass through the ionosphere, and the paths through the ionosphere are completely different twice. The movement difference between the external radiation source and the receiver is large, and it is not a simple one-way model. , need to be considered separately, this issue is not involved in the existing research on external radiation source radar, and the calculation process of the coherence duration under the background of space-based external radiation source radar in the existing technology is complicated, and many parameters are required, the calculation less efficient

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