Time-frequency domain cycle encoding and restoring method for continuous pulse radar signal

Abstract

The invention provides a time-frequency domain cycle encoding and restoring method for a continuous pulse radar signal. The time-frequency domain cycle encoding of the signal comprises the following steps: setting the numbers and bandwidths of sub-bands of an emitting signal according to a continuous pulse radar system; setting the time width of an emission sub-pulse group; grouping emission sub-pulse sequences, so as to obtain the data of the emission sub-pulse group and a basic code of a subgroup; and carrying out a time domain cycle coding on the sub-pulse sequences, so as to obtain continuous pulse radar emission signal codes. A signal restoring method comprises the following steps: listing an echo expression formula of each receiving window; solving an echo expression formula equationset, so as to obtain an echo signal of a single pulse signal of each sub-band in each receiving window; carrying out normalization processing on the echo signal of the of the single pulse signal of each sub-band; and synthesizing broadband of the echo of each sub-band, so as to obtain a complete bandwidth pulse echo signal. According to the time-frequency domain cycle encoding and restoring method, the complete echo signal can be restored, the restoring process of the signal is simple, the requirements on ADC and DAC are reduced, and the system design difficulty is reduced.

Description

technical field [0001] The present disclosure relates to the field of radar waveform design, in particular to a time-frequency domain cyclic encoding and recovery method for continuous pulse radar signals. Background technique [0002] Miniaturization is an important development direction of Synthesis Aperture Radar (SAR). The focus of light and miniaturization research is: how to reduce the weight, size and power consumption of the radar under the premise of ensuring the performance of the radar. Frequency modulated continuous wave synthetic aperture radar is the result of the combination of frequency modulated continuous wave and synthetic aperture radar applied to the altimeter. Its deskewing receiving system and ultra-large pulse width mechanism greatly reduce the requirements for the digital processing part of the system and the transmitter, thus realizing System miniaturization. However, because it requires two antennas (one antenna is used for transmission and the o...

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Problems solved by technology

However, because it requires two antennas (one antenna is used for transmission and the other antenna is used for reception), the isolation degree is difficult to be high, so the operating distance of FM continuous wave synthetic aperture radar is limited. FM continuous wave synthetic aperture radar is mainly used In the case of short-distance narrow survey swaths

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