Terahertz radar imaging method based on pre-modulated AIC
A radar imaging and terahertz technology, which is applied in the field of radar imaging, can solve the problems of terahertz radar signal storage and transmission not involved in how to deal with it, the complexity and high cost of terahertz radar system, and overcome the high echo distance of terahertz radar It is difficult to distinguish imaging, solve the effect of large data volume, and reduce adverse effects
Inactive Publication Date: 2015-06-10
XIDIAN UNIV
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[0003] The terahertz radar system and imaging method in the prior art have the following deficiencies: the data sampling, storage and transmission of the large-bandwidth terahertz radar signal do not involve how to deal with it, and the complexity and complexity of the terahertz radar system brought about The cost is also very high
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[0013] The present invention will be further described below in conjunction with accompanying drawing:
[0014] refer to figure 1 , is a schematic flowchart of the premodulated AIC-based terahertz radar imaging method of the present invention. The terahertz radar imaging method based on premodulated AIC includes the following steps:
[0015] Step 1. Use the terahertz radar to transmit the signal, use the terahertz radar to receive the echo signal reflected by the target scattering point, and perform coherent demodulation on the echo signal to obtain the baseband chirp echo signal x(t), where t represents time.
[0016] Step 2, using a pre-modulated analog information converter to perform down-sampling processing on the baseband chirp echo signal x(t) to obtain a down-sampled observation signal.
[0017] refer to figure 2 , is a schematic diagram of a downsampling process of the premodulated AIC according to an embodiment of the present invention. The specific sub-steps of...
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The invention belongs to the technical field of radar imaging and relates to a terahertz radar imaging method based on pre-modulated AIC. The terahertz radar imaging method comprises the specific steps of 1, transmitting signals to the outside by use of a terahertz radar, receiving echo signals reflected by target scattering points by use of the terahertz radar, and performing coherent demodulation on the echo signals to obtain base-band linear modulated echo signals x (t), 2, performing down-sampling processing on the base-band linear modulated echo signals x (t) to obtain down-sampling observation signals, and 3, performing sparse reconstruction on the down-sampling observation signals to obtain a distance image of the target scattering points, wherein t represents a discrete time variable.
Description
technical field [0001] The invention belongs to the technical field of radar imaging, and further relates to a terahertz radar high-resolution distance imaging method based on a premodulated AIC (analog information converter) in the technical field of radar. The present invention adopts the pre-modulation AIC down-sampling structure to realize the down-sampling processing of the radar echo in the terahertz radar system, so as to solve the problems of super large data collection, storage and transmission in the terahertz radar, and reduce the complexity of the terahertz radar system and cost, it is convenient to realize terahertz radar signal processing and high-resolution imaging at a distance. Background technique [0002] Terahertz waves are electromagnetic waves between millimeter waves and infrared light (frequency ranges from 0.1THz to 10THz), and it is also the last frequency band that humans have not yet fully recognized and utilized. Terahertz wave combines the adva...
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IPC IPC(8): G01S13/89
CPCG01S13/89
Inventor 王敏牛俊翔褚旭
Owner XIDIAN UNIV