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Multiple baseline design method for improving indication performance of ground moving target

A technology of ground moving target and design method, which is applied in the derivation of multi-channel ATI general algorithm and the field of multi-baseline design to achieve the effect of prolonging the blind speed period and expanding the detection speed range

Inactive Publication Date: 2013-03-06
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the multi-channel single SAR platform, the present invention proposes a multi-baseline design method according to the relationship between baseline length and moving target detection performance, and deduces a corresponding multi-channel ATI general algorithm to solve the above problems

Method used

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  • Multiple baseline design method for improving indication performance of ground moving target
  • Multiple baseline design method for improving indication performance of ground moving target
  • Multiple baseline design method for improving indication performance of ground moving target

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Experimental program
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Embodiment approach

[0069] Taking 5-channel as an example, the present invention designs an antenna and its transmitting and receiving mode satisfying multi-baseline requirements, derives a matching 5-channel ATI general algorithm, and verifies the validity and practicability of the method through simulation. The specific implementation is as follows:

[0070] 1. Design the antenna configuration to meet the multi-baseline requirements

[0071] step one:( image 3 ) Antenna adopts one-send-multiple-receive mode, full-aperture transmits, and 5 sub-apertures receive. The configuration of the antenna is 1:1:3:1:1, which are respectively called channel-2, channel-1, channel 0, channel 1, and channel 2. Set B to be the baseline unit length.

[0072] Step 2: Select channel 0 as the reference channel.

[0073] Step 3: Calculate the baseline length of channel i relative to reference channel 0 as:

[0074] d - ...

Embodiment

[0108] The antenna and ATI algorithm designed by the present invention are used to simulate the echoes of stationary and moving point targets. The simulation parameters are shown in Table 1. On this basis, the test of the generality, effectiveness and practicality of the present invention is completed.

[0109] According to the simulation parameters in Table 1, and the qualitative relationship between baseline length and moving target detection performance, the values ​​of each detection index can be obtained, as shown in Table 2, where the phase threshold Δφ d Set to 0.2. It can be seen that multi-baseline can improve the detection indicators of various moving targets at the same time, and the detectable speed range basically covers the range velocity (5km / h-258km / h) of ground moving targets, divided by The range to ground speed range of the ground target can be obtained, where θ i is the angle of incidence on the ground.

[0110] Table 1 Simulation parameters

[0111] ...

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Abstract

Aiming at a multi-channel single SAR (Synthetic Aperture Radar) platform and for analyzing the influence of the baseline length to the moving target indication, the invention discloses an antenna design method of multiple baselines and a corresponding multi-channel ATI (Along Track Interferometry) universal algorithm is elicited. By utilizing the baseline design method, the flexibility in selecting the baselines in a system is improved, the moving target indication performance is improved according to different demands, and abundant interference phase information is provided for later processing; and the ATI universal algorithm in match with the antenna design method is applicable to all multi-channel GMTI (Ground Moving Target Indication) systems of which the antenna mode is that one is used for transmitting and multiple for receiving, and a phase filter mode involved is simple and effective, so that the ATI universal algorithm has good university and strong practicability.

Description

technical field [0001] The invention belongs to the field of signal processing, in particular to a multi-baseline design method for improving the detection performance of ground moving targets, and provides the derivation of a multi-channel ATI general algorithm for the design method. Background technique [0002] Synthetic Aperture Radar (SAR) is widely used in reconnaissance, surveying and mapping, resource detection, environmental monitoring and other fields due to its advantages of high resolution, all-weather and all-time. The detection of ground moving targets (GMTI-Ground Moving Target Indication) is an important application of SAR. [0003] SAR usually works in the downward-looking state when realizing the GMTI function, and the high-speed motion of the carrier causes the main lobe clutter of the scene to have a large azimuth Doppler bandwidth, which largely submerges the target echo in the velocity range of interest signal, which seriously affects the detection per...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90
Inventor 李景文王冠琼于泽杨威曾虹程
Owner BEIHANG UNIV
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