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Ground object target received power generation method and system based on synthetic aperture radar
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A technology of synthetic aperture radar and received power, which is applied in radio wave measurement system, radio wave reflection/re-radiation, utilization of re-radiation, etc., to achieve high precision and reduce calculation time
Inactive Publication Date: 2009-07-15
CHINESE ACAD OF SURVEYING & MAPPING
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Compared with the system search method, the calculation time required by the Schuler method is much les
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Embodiment 1
[0017] Such as figure 1 As shown, it is a flow chart of a method for generating received power of ground objects based on synthetic aperture radar according to an embodiment of the present invention, and the method includes:
[0018] Step 101, obtaining a Stokes vector of a transmitting antenna from a transmitting signal transmitted by the transmitting antenna to a ground object.
[0019] Step 102, obtaining the Stokes vector of the receiving antenna from the feedback signal received by the receiving antenna from the ground object.
[0020] Step 103, acquiring the Stokes matrix of the ground object generated according to the feedback signal of the ground object from the receiving antenna.
[0021] Step 104, generating the received power of the ground object according to the Stokes vector of the transmitting antenna, the Stokes vector of the receiving antenna and the Stokes matrix of the ground object.
[0022] Optionally, half of the product of the Stokes vector of the trans...
Embodiment 2
[0029] The embodiment of the present invention utilizes Cauchy's inequality, and for a given transmission or reception polarization state (expressed as a Stokes vector), directly determines the matching reception or transmission polarization Stoke that can maximize or minimize the received power vector, forming cross iterations, and finally quickly converges to the maximum or minimum received power.
[0030] The Stokes vector representing the polarization state of a polarized electromagnetic wave or a radar antenna can be expressed as follows:
[0031]
[0032] in and x respectively represent the azimuth and elliptic angle of the polarization ellipse, and the azimuth The value range of elliptic angle x is [-90°, 90°], and the value range of elliptic angle x is [-45°, 45°]. For the convenience of description, the Stokes vector G of the receiving and transmitting antennas is r , G t Respectively abbreviated as G r =[1 r 1 r 2 r 3 ] T , G t =[1t 1 t 2 t 3 ] ...
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Abstract
The invention provides a ground object target receiving power generating method and system based on synthetic aperture radar, wherein, the method comprises: acquiring the Stokes vector of transmitting antenna from the transmitting signal of the ground object target transmitted by the transmitting antenna; acquiring the Stokes vector of the receiving antenna from the feedback signal of the ground object target received by the receiving antenna; acquiring the Stokes matrix of the ground object target generated by the feedback signal of the ground object target form the receiving antenna; generating the ground object target receiving power based on the Stokes vector of the transmitting antenna, the Stokes vector of the receiving antenna and the Stokes matrix of the ground object target. Compared to the prior art, the invention has high accuracy for the optimum receiving power generation of the ground object target of the above embodiment, and can greatly reduce the calculation time.
Description
technical field [0001] The invention relates to a synthetic aperture radar, in particular to a synthetic aperture radar-based method and system for generating received power of ground objects. Background technique [0002] Synthetic Aperture Radar (SAR) is the most important earth observation technology developed in the 1950s. It transmits electromagnetic pulse signals at a certain time interval through the radar antenna while moving with the carrier, and receives ground object reflections at different positions. The echo signal is recorded and stored to form a high-resolution image of the ground. Polarization is a fundamental characteristic of electromagnetic waves. Polarimetric SAR transmits electromagnetic pulses of different polarization states through the antenna, such as horizontally polarized waves and vertically polarized waves (commonly represented by H and V), and then receives reflections from ground objects in different polarization states The echoes of ground ...
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