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Design method of linear fast-changing PRI sequence based on staggered SAR system

A sequence design and linear technology, applied in the field of microwave remote sensing, can solve the problems of missing pulses and non-uniform sampling in azimuth, achieve good imaging focusing performance, optimize system parameters, and solve the problems of missing pulses and non-uniform sampling in azimuth

Active Publication Date: 2021-11-30
HARBIN INST OF TECH
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of missing pulses and azimuth non-uniform sampling caused by the changing pulse repetition interval in the existing Staggered SAR system, the present invention proposes a linear fast-changing PRI sequence design method based on the Staggered SAR system

Method used

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  • Design method of linear fast-changing PRI sequence based on staggered SAR system
  • Design method of linear fast-changing PRI sequence based on staggered SAR system
  • Design method of linear fast-changing PRI sequence based on staggered SAR system

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specific Embodiment approach 1

[0037] Specific embodiments 1. This embodiment is based on the Staggered SAR system fast-changing PRI sequence design method, and proceeds in the following steps:

[0038] Step 1: Establish the change law of the transmission sequence PRI;

[0039] Step 2: According to the results of step 1, consider the selection range of the average pulse repetition period (the range of possible values ​​of PRF in the zebra diagram) under the condition of avoiding the influence of pulse masking and sub-satellite point echo, according to the average pulse repetition period (PRF in the zebra diagram The selection range of the available value interval) calculates the blind zone range under the average pulse repetition period;

[0040] Step 3: According to the result of step 2, construct the timing relationship of the transmitting and receiving echo sequence (the timing relationship of the transmitting and receiving echo sequence is as follows Figure 5 and Figure 6 shown), deduce the paramete...

specific Embodiment approach 2

[0048]Specific embodiment 2. The difference between this embodiment and specific embodiment 1 is that in the step 1, the change law of the transmission sequence PRI is established;

[0049] Assume that there are M different pulse repetition periods PRI in the transceiver timing m , PRI max and PRI min Corresponding to the maximum and minimum pulse repetition periods among the M PRIs, such as figure 2 Shown; assuming that the PRI sequence changes linearly, satisfying

[0050] PRI m =PRI m-1 -Δ=PRI 0 -mΔ,m=0,...,M-1(1)

[0051] Among them, PRI 0 Indicates the initial pulse repetition period, Δ indicates the interval between two adjacent PRIs;

[0052] PRI is the pulse repetition period;

[0053] Assuming Δ>0, the pulse repetition period value of the PRI sequence is gradually reduced. The design of the sequence should not only ensure that the echoes of all targets in the observation area will not be lost continuously, but also make the PRI min Minimum to meet distance...

specific Embodiment approach 3

[0056] Specific Embodiment 3. The difference between this embodiment and specific embodiment 1 or 2 is that in the step 2, according to the result of step 1, the average pulse repetition period (zebra diagram) under the condition of avoiding the influence of pulse cover and sub-satellite point echo is considered According to the selection range of the average pulse repetition period (the PRF value interval in the zebra diagram), the range of the blind zone under the average pulse repetition period is calculated; the specific process is as follows:

[0057] The parameter design of the Staggered SAR system is similar to the parameter design of the traditional spaceborne SAR system. The difference is that the pulse repetition frequency is no longer a constant value, but changes continuously with the transmitted pulse sequence within a certain range. At this time, the pulse repetition frequency parameter Selection needs to consider a certain range. Different PRF variation ranges a...

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Abstract

Based on a Staggered SAR system linear fast-changing PRI sequence design method, the invention relates to a method for generating text from structured data. The invention aims to solve the problems of pulse missing and azimuth non-uniform sampling caused by the changing pulse repetition interval in the existing Staggered SAR system. The process is as follows: 1: Establish the PRI variation law of the transmission sequence; 2: Consider the selection range of the average pulse repetition period under the condition of avoiding pulse occlusion and sub-satellite point echo, and calculate the average pulse repetition period under the average pulse repetition period according to the selection range of the average pulse repetition period Three: Calculate the value range of adjacent PRI intervals when M takes different values; Four: Optimize the maximum pulse repetition period parameter; Five: Reconstruct the Staggered SAR azimuth dimension signal, and finally use the reconstructed data to complete SAR imaging . The invention is used in the field of microwave remote sensing technology.

Description

technical field [0001] The invention relates to the technical field of microwave remote sensing, in particular to a method for designing a linear fast-changing PRI sequence based on a Staggered SAR system. Background technique [0002] High Resolution Wide Swath (HRWS) SAR with high temporal and spatial resolution will become one of the development trends of spaceborne SAR in the future. High spatial resolution can obtain accurate target information, which is convenient for target monitoring and positioning and feature extraction; high temporal resolution can ensure rapid acquisition of information on wide-area observation scenes. It plays an irreplaceable role in application fields such as terrain surveying and mapping, environment and disaster monitoring. [0003] One of the ways to solve the contradiction of "minimum antenna area constraint" is to use a variable pulse repetition interval (Pulse Repetition Interval, PRI) to solve the distance blind zone formed between the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/90G01S13/02G01S7/28
CPCG01S7/28G01S13/0209G01S13/90
Inventor 张云齐欣姜义成张倩
Owner HARBIN INST OF TECH
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