Motion attitude sensing method based on electromagnetic wave polarization three-dimensional electric/magnetic signal stationary characteristics
A technology of electromagnetic wave signal and motion attitude, which is applied in the direction of radio wave measurement system, measuring device, instrument, etc., can solve the problem of complex signal processing, and achieve the effect of reducing cost, arbitrary polarization state, and high acceleration resistance
Active Publication Date: 2015-04-29
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Traditional measurement and control navigation signals are generally actively transmitted by base stations, and array antennas are required for parameter estimation. This kind of antenna is multi-point receiving signals, and the signal processing is complicated.
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[0027] The present invention will be further described below in conjunction with the accompanying drawings.
[0028] A motion posture perception method based on the stationary characteristics of electromagnetic wave polarization three-dimensional electric / magnetic signals, such as figure 1 , 2 shown, including the following steps:
[0029] Step 1, according to the movement situation of the moving platform, define the reference attitude coordinate system of the moving platform, the coordinate system where the real-time attitude antenna of the platform moves is defined as the real-time attitude coordinate system, and determine the conversion relationship between the moving platform reference attitude coordinate system and the earth coordinate system;
[0030] Step 2: At the reference attitude of the motion platform, three orthogonal electric / magnetic field sensors in the polarization-sensitive electromagnetic vector sensor receive electromagnetic wave signals, and estimate the ...
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The invention discloses a motion attitude sensing method based on electromagnetic wave polarization three-dimensional electric/magnetic signal stationary characteristics. The method comprises the steps of receiving electromagnetic wave signals through a sensor at a motion platform reference attitude, obtaining a signal cross correlation matrix, computing a CRB (Cramer-Rao bound) value estimated through attitude parameters, and judging whether the electromagnetic wave signals can be used for motion platform attitude measurement in the environment; computing the signal cross correlation matrix at the motion platform reference attitude, and judging whether the electromagnetic wave signals are stationary at the environment or not according to characteristic values of the reference attitude and a real-time attitude cross correlation matrix; converting the motion platform attitude under a real-time attitude coordinate system to be at a geographic coordinate system, and accomplishing motion platform attitude sensing. The method has the advantages that attitude/course sensing can be realized only by one receiving point on the motion platform, the system can be miniaturized, the measurement accuracy is high, the system can be miniaturized, signals are not interfered by multipath effect, the method can not only be used for actively transmitting electromagnetic wave signals, can also passively receive space distributed broadcast electromagnetic wave signals to measure attitude, and improves the system invisibility. The method is applied to aerospace vehicles.
Description
technical field [0001] The invention relates to a motion attitude perception method based on the stationary characteristics of electromagnetic wave polarization three-dimensional electric (magnetic) signals, which belongs to the field of motion platform navigation, signal analysis and parameter estimation. Background technique [0002] The attitude information of the motion platform is mostly obtained from the fusion of other information by the inertial navigation sensor. At present, the attitude information system of the motion platform is complex in structure, large in mass and volume, consumes energy, and has a high failure rate. However, the measurement accuracy of the developing miniature inertial navigation attitude information system is not high. [0003] In some aerospace applications, there are special requirements for attitude navigation, such as fast measurement speed, high precision, small volume, mass, and energy consumption, resistance to large acceleration, r...
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IPC IPC(8): G01S5/16
CPCG01S5/0247
Inventor 陈广东孙红梅陈智
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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