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Linear fast change PRI sequence design method 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: 2021-05-11
HARBIN INST OF TECH
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  • Application Information

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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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  • Linear fast change PRI sequence design method based on Staggered SAR system
  • Linear fast change PRI sequence design method based on Staggered SAR system
  • Linear fast change PRI sequence design method based on Staggered SAR system

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specific Embodiment approach 1

[0037] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 1. This embodiment is based on the fast-changing PRI sequence design method of the Staggered SAR system, and is carried out according to the following steps:

[0038] Step 1: establish the variation 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 PRF values ​​in the zebra diagram) under the circumstance of avoiding pulse occlusion and the influence of sub-satellite echoes. 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 transmit-receive echo sequence (the timing relationship of the transmit-receive echo sequence is as follows: Figure 5 and Image 6 shown), deduce the design criteria of parameters (M and Δ) in the case of no c...

specific Embodiment approach 2

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

[0049] It is assumed that there are M different pulse repetition periods PRI in the transmission and reception timing m , PRI max and PRI min Corresponding to the maximum and minimum pulse repetition periods of the M PRIs, such as figure 2 shown; assuming that the PRI sequence varies linearly, satisfying

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

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

[0052] PRI is the pulse repetition period;

[0053] Assuming Δ>0, the value of the pulse repetition period 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 are not continuously lost, but also make the PRI as much as possible. min...

specific Embodiment approach 3

[0056] Embodiment 3. The difference between this embodiment and Embodiment 1 or 2 is that in step 2, according to the result of step 1, the average pulse repetition period (zebra diagram) is considered to avoid pulse masking and the influence of sub-satellite echoes. According to the selection range of the average pulse repetition period (the PRF value range in the zebra diagram), the blind area range 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. Selection needs to consider a certain range. Different PRF variation ranges and PRF variation rules affect the imaging performance index to a large extent, which is also the key to the des...

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Abstract

The invention discloses a linear fast change PRI sequence design method based on a Staggered SAR system, and relates to a method for generating a text through structured data. The invention aims to solve the problems of pulse loss and azimuth non-uniform sampling caused by changing pulse repetition intervals in the existing Staggered SAR system. The method comprises the following steps: 1, establishing a PRI change rule of a transmitting sequence; 2, considering a selection range of an average pulse repetition period under the condition of avoiding pulse masking and sub-satellite point echo influence, and calculating a blind area range under the average pulse repetition period according to the selection range of the average pulse repetition period; 3, calculating the value range of adjacent PRI intervals when M is different values; 4, optimizing a maximum pulse repetition period parameter; and 5, reconstructing a Staggered SAR azimuth dimension signal, and finally completing SAR imaging by using the reconstructed data. The invention relates to the technical field of microwave remote sensing.

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 has 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, positioning and feature extraction; high temporal resolution can ensure rapid acquisition of wide-area observation scene information. It plays an irreplaceable role in topographic mapping, environmental and disaster monitoring applications. [0003] One of the ways to solve the contradiction of "minimum antenna area constraint" is to solve the distance blind area formed between the traditional elevation-dimension multi-channel sub-swaths by using a variable pulse repetition interval (Pu...

Claims

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Application Information

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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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