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Space arbitrary configuration distributed SAR moving target parameter estimation method based on cancellation accumulation space-time spectrum

A technology of arbitrary configuration and parameter estimation, applied in the direction of reflection/re-radiation of radio waves, utilization of re-radiation, measurement devices, etc., can solve the problems of waste of information, large influence of signal-to-noise ratio, etc., and achieve cost savings and strong anti-noise. , to solve the effect of strong correlation signals

Inactive Publication Date: 2010-12-15
HARBIN INST OF TECH
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  • Abstract
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  • Application Information

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Problems solved by technology

[0014] In order to solve the problem that the existing SAR multi-channel processing method is greatly affected by the signal-to-noise ratio and wastes information when estimating parameters, the present invention proposes a spatially arbitrary configuration distributed SAR motion based on destructive accumulation of space-time spectrum. target parameter estimation method

Method used

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  • Space arbitrary configuration distributed SAR moving target parameter estimation method based on cancellation accumulation space-time spectrum
  • Space arbitrary configuration distributed SAR moving target parameter estimation method based on cancellation accumulation space-time spectrum
  • Space arbitrary configuration distributed SAR moving target parameter estimation method based on cancellation accumulation space-time spectrum

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specific Embodiment approach 1

[0021] Specific implementation mode 1. Combination figure 1 In this embodiment, the method for estimating the parameters of a distributed SAR moving target with any spatial configuration by using the destructive accumulation space-time spectrum, the specific process is as follows:

[0022] Step 1. According to the ultra-sparse distribution and high-speed flight characteristics of the space-borne distributed SAR, an extended space-time model of the distributed synthetic aperture radar echo signal with an arbitrary configuration in space is established;

[0023]Step 2, using the conjugate of the extended space-time model obtained in step 1 as the cancellation factor, using the method of space-time accumulation to establish an objective function, the meaning of the objective function is as follows: the cancellation factor containing the motion parameter search value Multiply with the echo signal, when the phase of the slow-time sampling point corresponding to the cancellation fac...

specific Embodiment approach 2

[0025] Embodiment 2. This embodiment is a further description of Embodiment 1. The specific process of Step 1 is as follows:

[0026] Step 11. Use the signal transmitting satellite as the reference star, and the small satellites in the formation only receive the echo signal. With the sub-satellite point of the reference star as the origin, establish a three-dimensional rectangular coordinate system, where the X axis is along the course, and the Y axis is parallel to the ground. The heading is inscribed in the horizontal plane of , and the Z axis is perpendicular to the ground;

[0027] Step 12. At t=0, the reference star is the reference array element, and the coordinates of the reference array element are (0, 0, H), where H is the height of the reference array element from the ground, and the coordinates of the nth array element are ( B an , B rn , H+B vn ), wherein, n=1, 2, ..., N, N is the number of array elements, that is, the number of formation small satellites; the c...

specific Embodiment approach 3

[0049] Specific embodiment 3. This embodiment is a further description of step 2 in specific embodiment 1 or 2. The objective function described in step 2 is expressed as:

[0050]

[0051]

[0052] in, is the cancellation factor of the kth slow moment of the nth array element, for complex conjugate transpose, It is the kth pulse of the nth array element, the azimuth direction signal of a certain range unit containing the target on the range ring.

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Abstract

The invention discloses a space arbitrary configuration distributed SAR moving target parameter estimation method based on a cancellation accumulation space-time spectrum and relates to the distributed SAR ground moving target parameter estimation method. The method is used for solving the problems of great impacts caused by signal-to-noise ratio and waste of information when the existing SAR multi-channel processing method carries out parameter estimation, and the specific process of the method is as follows: 1) establishing an extended space-time model of space arbitrary configuration distributed synthetic aperture radar echo signals according to the super-sparse distribution and the high-speed flight characteristic of a spaceborne distributed SAR; 2) taking a conjugate of the extended space-time model obtained in the step 1) as a cancellation factor, and utilizing the space-time accumulation method for establishing an objective function; and 3) utilizing the objective function obtained in the step 2) to carry out the moving target parameter estimation on multi-source signals of the space arbitrary configuration distributed SAR. The method is applicable to the distributed SAR moving target parameter estimation.

Description

technical field [0001] The invention relates to a method for estimating parameters of a distributed SAR ground moving target. Background technique [0002] Distributed Synthetic Aperture Radar (SAR) is a new radar system based on the formation flight satellite group (or distributed small satellite, or constellation) system proposed in the mid-1990s. Small satellites have a series of advantages such as light weight, small size, short development cycle, low cost, flexible launch, etc., and can also be mass-produced. Therefore, the cost and reliability of using a small satellite to form a constellation will be better than a large satellite. The ground detection function and performance of constellation SAR (also known as distributed small satellite SAR) using formation small satellites will greatly exceed that of a traditional large satellite SAR. Its advantages include: wide-area, high-resolution SAR imaging, low-velocity ground Moving target detection, multi-baseline, single...

Claims

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Application Information

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IPC IPC(8): G01S7/41G01S7/292G01S13/50
Inventor 刘梅李晨雷张雷张声杰
Owner HARBIN INST OF TECH
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