External correction method for interferometer system
An interferometer and external correction technology, which is used in direction finders using radio waves, complex mathematical operations, etc., and can solve problems such as direction finding accuracy decline and phase deviation.
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Embodiment 1
[0085] An external correction method for interferometer systems, such as image 3 shown, including the following steps:
[0086] S1, determine the correction value of each azimuth to form a correction table;
[0087] S2, send the correction table to the receiver, first delineate the angle range of fine direction finding on the basis of rough direction finding, and then examine the correction values of each sub-direction within the angle range, so as to make the phase of each channel after the correction operation The minimum standard deviation of the difference is the optimal criterion; the correction value corresponding to the minimum standard deviation is selected as the optimal correction value, and its corresponding direction is used as the final measurement result.
Embodiment 2
[0089] On the basis of Embodiment 1, in step S1, including sub-steps:
[0090] S11, using the vector network to scan the beam pattern to obtain the accurate orientation of the external radiation source, and rotate the antenna so that the normal direction is directly opposite to the orientation of the radiation source;
[0091] S12, assuming that the beam coverage of the interferometer system is ±β°, rotate the turntable within the range of the radiation source azimuth (0° at this time) ±β°, starting from -β°, select an azimuth angle vi at the azimuth interval Interval , obtain the phase difference of each channel corresponding to the azimuth:
[0092] ΔFivi={ΔFivi Ph2-Ph1 , ΔFivi Ph3-Ph2 , ΔFivi Ph4-Ph3 }
[0093] Ph1 is the phase of the first array element; Ph2 is the phase of the second array element; Ph3 is the phase of the third array element; Ph4 is the phase of the fourth array element; the phase difference of each adjacent channel;
[0094] S13, the turntable is t...
Embodiment 3
[0098] On the basis of Embodiment 1, in step S2, including sub-steps:
[0099] S21, the external signal enters the interferometer system;
[0100] S22, correct the phase difference with a set of correction data in the normal line direction, and use the corrected result to calculate the rough direction finding result D;
[0101] S23, after obtaining the rough direction finding result D, add or subtract a fixed angle error value C to obtain the azimuth range D1-D2 where a real target is located;
[0102] S24, within the azimuth range D1-D2, according to the azimuth interval Interval as an interval, apply a series of correction data under the current frequency point one by one to obtain a series of corrected data:
[0103] N={N1,N2,...,N(2*C / Interval)}
[0104] ={N_D1,N_(D1+Interval),N_(D1+2*Interval),...,N_(D2)};
[0105] S25, select the element corresponding to the minimum standard deviation in the set N, and determine the real incident angle as vi according to the correspon...
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