Correction method for amplitude and phase consistency of external radiation source radar array antenna

Abstract

The invention provides a correction method for amplitude and phase consistency of echo channels of an external radiation source radar array antenna. Radiation source signals are directly used for correcting the echo receiving array antenna, and the echo antenna is aligned to a radiation source; since the antenna is far apart from the radiation source, if the etch antenna receives plane waves, radiation source signals received by echo channels of the antenna are consistent; then, a reference echo channel is set, the signals of the other echo channels are mixed with signals of the reference echo channel, and a correction coefficient of the other echo channels relative to the reference echo channel is calculated; and finally, the signal of each echo channel is multiplied by the correction coefficient so as to synthesize echo signals. The method provided by the invention does not need a special correction network, and directly utilizes the radiation source signals to perform amplitude and phase correction on the echo receiving array antenna, so that the system complexity is lowered, the special correction network is removed, and higher correction precision is realized as the influence of inconsistency among antenna array elements is considered.

Description

technical field [0001] The invention relates to a method for correcting the amplitude-phase consistency between the echo channels of an external radiation source radar array antenna, which belongs to the field of radar detection. Background technique [0002] The external radiation source radar itself does not emit signals. It realizes the monitoring of airspace targets by passively receiving electromagnetic signals emitted by non-cooperative radiation sources (television, radio, communication stations, GPS, etc.) reflected by targets. [0003] Since the target echo signal is very weak, the radar echo antenna generally uses multiple array elements to synthesize it to increase the target signal power and reduce sidelobes. The mismatch between echo channels will seriously affect the radar performance. Moreover, the signal received by the radar echo antenna is the superposition of the target echo signal, the direct wave from the transmitting station and the interference signal ...

AI Technical Summary

Problems solved by technology

[0006] (1) Special correction network is required, and the equipment is complex

[0007] (2) Due to the error of equipment such as the power distribution network in the correction network, a new amplitude-phase consistency error is introduced

[0008] (3) Due to the influence of factors such as different machining accuracy between antenna elements, differences in installation spacing, and different array element gains, there are inherent errors in the echo antenna. The above correction method only corrects the amplitude of the echo channel after the echo antenna element. Phase consistency, the amplitude and phase consistency of the antenna element itself is not corrected

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