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Method for generating SAR echo signal with frequency hopping

A technology of echo signal and frequency hopping, which is applied in the direction of radio wave measurement systems, instruments, etc., can solve the problems such as the lack of SAR echo signal generation methods, and achieve the effect of improving loading efficiency, improving storage efficiency, and convenient loading

Active Publication Date: 2019-03-15
BEIJING ZHENXING METROLOGY & TEST INST
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Problems solved by technology

[0005] In view of the above analysis, the present invention aims to provide a frequency hopping SAR echo signal generation method to solve the problem in the prior art that there is no SAR echo signal generation method whose center frequency changes alternately with the pulse trigger signal

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  • Method for generating SAR echo signal with frequency hopping
  • Method for generating SAR echo signal with frequency hopping
  • Method for generating SAR echo signal with frequency hopping

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Embodiment

[0040] A specific embodiment of the present invention discloses a method for generating SAR echo signals with frequency hopping. include,

[0041]Use the SAR echo simulation software to generate I / Q two-way baseband SAR digital echo signals with a center frequency of zero, load the baseband data into the RF memory board, and generate intermediate frequency SAR echo signals through digital up-conversion; then Set the frequency jump value fd, and generate a DDS local oscillator source with the jump frequency value inside the RF memory board; receive the synchronous trigger pulse signal, and output the intermediate frequency SAR with the frequency f1 when the pulse trigger signal is an odd number Echo signal; when the pulse trigger signal is an even number, output an intermediate frequency SAR echo signal with frequency f1+fd after frequency mixing; after frequency up-conversion by the radio frequency system, generate a radio frequency SAR echo signal with frequency hopping. The...

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Abstract

The invention relates to a method for generating an SAR echo signal with frequency hopping, and belongs to the technical field of radar target echo simulation. The problem is solved that in the priorart, there is no method for generating the SAR echo signal with center frequency which alternately changes along with a pulse triggering signal. The method for generating the SAR echo signal with frequency hopping includes the detailed steps that an I / Q two base band SAR digital echo signal with center frequency being zero is generated; a data file of the base band SAR digital echo signal is loaded into a radio frequency storage plate card; the radio frequency storage plate card generates a medium-frequency SAR echo signal with center frequency which changes alternately, and the medium-frequency SAR echo signal is sent to a radio frequency system in real time; the radio frequency system conducts up-conversion processing on the medium-frequency SAR echo signal, so that the radio frequency SAR echo signal with alternate frequency change is obtained. Through the method, the SAR echo signal with the center frequency which alternately changes along with the synchronous pulse triggering signal is generated, the coherence of the SAR echo signal is kept, and the application requirements of imaging tests with a high resolution can be met.

Description

technical field [0001] The invention relates to the technical field of radar target echo simulation, in particular to a frequency hopping SAR echo signal generation method. Background technique [0002] The radar target echo simulator is a device used in radar ground testing, which can simulate the target echo signal detected by radar. SAR (Aperture Radar) target echo simulation is to simulate and generate SAR target scene echo signals according to SAR system parameters, imaging system, working mode, and target scene characteristics, which are used for imaging tests of synthetic aperture radar, and perform SAR imaging functions and Performance metrics evaluation. [0003] With the rapid development of SAR technology, SAR imaging system and imaging processing technology with frequency hopping function appeared. The chirp signal of two pulses is synthesized by signal processing technology to obtain a chirp signal with wider bandwidth, so that the imaging resolution can be im...

Claims

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Application Information

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IPC IPC(8): G01S7/40
CPCG01S7/4052
Inventor 王斌关文硕李代松胡志友
Owner BEIJING ZHENXING METROLOGY & TEST INST
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