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Non-control point surveying and mapping SAR baseline calibration method

A technology without control points and calibration methods, applied in radio wave measurement systems, radio wave reflection/re-radiation, measurement devices, etc., can solve the problem that it is difficult to obtain elevation control points for surveying and mapping SAR, and achieve strong practicability and algorithm Good robustness, good robustness effect

Active Publication Date: 2019-02-12
XIAN INSTITUE OF SPACE RADIO TECH
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Problems solved by technology

[0005] The technical problem of the present invention is to overcome the deficiency that the existing baseline calibration method requires ground control points, and provides a SAR baseline calibration method for surveying and mapping without control points. This method only requires

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  • Non-control point surveying and mapping SAR baseline calibration method

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Embodiment

[0088] The reference area interferometric phase adopted in this embodiment is generated based on the InSAR system parameter simulation of Table 1, image 3It is a schematic diagram of the DEM of the simulation area, Figure 4 Interferometric phase of the observed region generated for the simulation.

[0089] Table 1

[0090] System parameters

value

Center frequency

35GHz

Satellite platform height

15km

baseline length

2m

Baseline inclination

0deg

Operating mode

Ping-pong mode

survey belt

2.4km

resolution

0.5m

[0091] The steps of baseline parameter calibration are as follows:

[0092] (a1) Set the elevation interval [a, b] and step size Δh of the target area according to the prior information, assuming the elevation interval is [-5m, 5m], and the sampling interval is 0.25m;

[0093] (a2) Traverse each value of the elevation interval [-5m, 5m] according to the step size of 0.25m,...

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Abstract

The invention provides a non-control point surveying and mapping SAR baseline calibration method. According to the method, for a characteristic that a surveying and mapping SAR difficultly obtains anelevation control point, a function model of an interference phase of a reference target region and a baseline vector is built, elevation information of the target region is set as an unknown quantityinterval to perform traversal estimation, and then a baseline estimation result is screened based on a mean square error minimum criterion, so that high-precision baseline estimation under the condition of no control point is achieved. The method comprises the two parts including extended Kalman filter (EKF)-based baseline parameter estimation and mean square error minimum criterion-based baseline parameter selection. The method does not depend on ground control point information, solves the problem that the surveying and mapping SAR difficultly obtains the elevation control point, and is good in algorithm robustness and high in practicability.

Description

technical field [0001] The invention relates to a SAR baseline calibration method for surveying and mapping without control points, and belongs to the technical field of synthetic aperture radar (SAR) data processing. Background technique [0002] Spaceborne synthetic aperture radar (SAR), as an important means of high-resolution microwave remote sensing for earth observation, has received more and more attention in recent years. SAR has all-day and all-weather working capabilities, and can obtain high-resolution images of targets in multi-band and multi-polarization modes, so it is widely used in terrain mapping, ocean monitoring, disaster reduction and prevention, agriculture, forestry, and military reconnaissance. play an important role. [0003] There is a permanent shadow area in Antarctica, and the terrain has large fluctuations. The optical mapping system is limited by the lighting conditions and cannot meet the needs of topographic mapping in the shadow area. It is ...

Claims

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Application Information

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IPC IPC(8): G01S13/90G01S7/40
CPCG01S7/40G01S13/9023
Inventor 胡继伟谭小敏党红杏
Owner XIAN INSTITUE OF SPACE RADIO TECH