Passive direction-finding test method based on two-dimensional orthogonal interferometer for whole star conditions

Abstract

The present invention discloses a passive direction finding test method based on a two-dimensional quadrature interferometer in a whole-spacecraft condition. The method comprises the following steps: the step 1: after a satellite is powered up, an electron reconnaissance load powers up according to time series, the work mode of the electron reconnaissance load is set to a full-band scanning mode to obtain background signals of each frequency band; and the step 2: selecting one each of clean frequency points of each frequency band according to the background signals obtained in the step 1 to take as the frequency set value of the test. The passive direction finding test method based on the two-dimensional quadrature interferometer in the whole-spacecraft condition can perform test of the direction-finding capability of an electron reconnaissance load based on a two-dimensional quadrature interferometer in a common whole-spacecraft electrical test workshop and perform functional assessment to satisfy the assessment requirement for qualitative assessment of the direction-finding capability of an electron reconnaissance load in the whole-spacecraft state and adapt the requirement of complex environment of a common whole-spacecraft electrical test workshop; and the passive direction finding test method based on the two-dimensional quadrature interferometer in the whole-spacecraft condition is reasonable and simple in scheme and efficient for functional assessment.

Description

technical field [0001] The invention relates to a passive direction-finding test method based on a two-dimensional orthogonal interferometer, in particular to a passive direction-finding test method based on a two-dimensional orthogonal interferometer under the condition of the whole star. Background technique [0002] The passive direction finding and positioning of radiation sources has the advantages of good concealment, no influence of climate, low power consumption, easy realization, and characteristic analysis of radiation source signals. The two-dimensional orthogonal interferometer direction finding and positioning technology, as one of the common means of passive direction finding and positioning, has important applications in both military and civilian fields. [0003] As the core capability of the two-dimensional orthogonal interferometer, the direction finding capability needs to be tested comprehensively at each stage. According to the principle of interferomet...

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Problems solved by technology

[0004] The field test requires a large test site. Usually, the ground radiation source needs to be more than 100 meters away from the passive direction-finding receiving antenna. At the same time, the field test is affected by the outdoor weather, which brings certain risks to the work and product safety; the electromagnetic field in the external environment Signal interference will also have a certain impact on the test of product direction finding capability

The anechoic chamber is tested indoors and is not affected by the weather. At the same time, the anechoic chamber can better shield the interference of electromagnetic signals, but because the test distance still needs to be kept at about 50 meters, and the anechoic chamber absorbing material needs to have the ability to shield electromagnetic signals in the corresponding frequency band , so there are higher requirements for the microwave anechoic chamber; at the same time, the near-field effect error introduced by the test needs to be eliminated in the later data processing

[0005] Under full-star conditions, the test workshop usually does not have the ability to shield electromagnetic signals, and the test station is relatively small, about 20 meters away, so it does not meet the conditions for darkroom testing

At the same time, due to the large scale of the whole star and high power supply requirements, it is inconvenient to carry out field tests, and it cannot meet the power supply demand. Weather changes also pose a potential threat to the quality of the whole star products.

Therefore, there is currently no method to verify the passive direction finding capability in the whole star state

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