Satellite borne circle scan radar wave beam center pointing error estimation method
A radar beam and pointing error technology, applied in radio wave measurement systems, instruments, etc., can solve problems such as Doppler ambiguity calculation errors, timing mismatch, and degraded range ambiguity, so as to improve robustness and accuracy, complete sex high effect
Active Publication Date: 2019-12-03
XIAN INSTITUE OF SPACE RADIO TECH
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Problems solved by technology
XX spaceborne ring scan radar adopts synthetic aperture processing method, the resolution is on the order of 100 meters, and the pulse repetition frequency is much higher than that of traditional scatterometer. The real-time processing on the star needs to obtain very high-precision antenna beam center pointing, and the azimuth measured by the servo mechanism The design values of angle and antenna viewing angle cannot be directly used for real-time processing, otherwise the azimuth error will lead to Doppler parameter calculation error, which will deteriorate the azimuth ambiguity, and in severe cases, it will cause Doppler ambiguity calculation error, and the target positioning error will deteriorate sharply
The angle of view error will lead to the calculation error of the slant distance of the beam center, which does not match the timing, deteriorates the range ambiguity, and even leads to narrowing of the effective width
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[0042] A method for estimating the pointing error of the beam center of a spaceborne circular scan radar, such as figure 1 ,include:
[0043] Perspective error estimation process:
[0044]1. First extract the echo data and auxiliary data (satellite position velocity, attitude, servo angle) of the scan radar, and align the two data to the same time.
[0045] 2. Perform distance pulse compression on the echo data.
[0046] 3. Perform envelope center position estimation on the pulse compression data in step 2.
[0047] 4. Calculate the beam pointing of the system according to the servo angle in the auxiliary data, and then calculate the conversion matrix from the system to the fixed coordinate system of the earth according to the position, velocity and attitude of the satellite, and convert the pointing of the beam to the fixed coordinate system of the center of the earth. , and then calculate the distance between the beam center and the ground intersection point.
[0048] 5....
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The invention provides a satellite borne circle scan radar wave beam center pointing error estimation method and belongs to the technical field of radars. The method includes the following steps: errors of azimuthal angles under different scanning angles are obtained by estimating a Doppler central frequency of an echo, errors of angles of view under different scanning angels are obtained by estimating the distance between the echo and the envelope center, and finally curve fitting is performed according to the errors of the azimuthal angles and the errors of the angles of view under differentscanning angles to reduce estimation noise and obtain angle error compensation parameters for the modification.
Description
technical field [0001] The invention relates to a method for estimating the pointing error of the beam center of a spaceborne ring-scanning radar. Without the help of ground calibration equipment, the pointing error of the beam is estimated through the radar echo characteristics, and the installation error and stress change are eliminated or reduced. The effect on beam pointing belongs to the field of radar technology. Background technique [0002] At present, the spaceborne ring scan radars at home and abroad are scatterometers, which adopt the real aperture radar processing method, the resolution is generally on the order of several kilometers to tens of kilometers, and the pulse repetition frequency is low (tens of Hz to hundreds of Hz). The accuracy of beam pointing is relatively low, and the azimuth angle measured by the servo mechanism and the viewing angle of the antenna design can meet the requirements. XX spaceborne ring scan radar adopts synthetic aperture process...
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CPCG01S7/4004G01S7/4052
Inventor 张选民贺荣荣高阳党红杏谭小敏解虎李诗润
Owner XIAN INSTITUE OF SPACE RADIO TECH