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

A cyclic coding and pulse radar technology, applied in radio wave measurement systems, instruments, etc., can solve the problems of limiting the working distance of FM continuous wave synthetic aperture radar and difficulty in isolation, achieving good signal quality, and reducing the difficulty of development and reduction. effect of difficulty

Inactive Publication Date: 2018-09-04
INST OF ELECTRONICS CHINESE ACAD OF SCI
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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 oper

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

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[0055] The present disclosure provides a time-frequency domain cyclic coding method for transmitting signals applied to continuous pulse radar: on the one hand, the original echo signal can be restored from the intermittent echo signal; in addition, the requirements for ADC and DAC are reduced.

[0056] The present disclosure reduces the difficulty of system design. For radar systems with bandwidths up to GHz, the design of high-speed ADCs, DACs and small signal units is very difficult. First, after the bandwidth increases, the conversion clock frequency of ADCs and DACs doubles. As a result, the difficulty of high-speed circuit design and dual-channel synchronization is increased, hardware costs and power consumption are greatly increased, and system reliability is difficult to guarantee; secondly, the most difficult thing for small signal units to do is in-band flatness and out-of-band rejection indicators. Although with the development of device technology, the bandwidth of dev...

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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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Application Information

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IPC IPC(8): G01S7/02G01S7/41
CPCG01S7/02G01S7/41
Inventor 李和平王岩飞朱建光马翠梅赵达伟贾冰杰
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI
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