Although the ambiguity function of Beidou signal is roughly shaped like a pin, there still exists some sidelobes, which would inevitably reduce target detection performance of passive radar to a certain extent. However, this feature has been ignored in the existing literatures. In this paper, the signal characteristics of Beidou passive radar are analyzed, and a simultaneous range domain and Doppler domain window adding technique is proposed, which can reduce the sidelobes effectively and improve conventional target detection performance over 3 dB. Simulation results demonstrate the effectiveness of the proposed method.
In this paper, passive radar imaging analysis based on spatial spectrum theory is studied. It has a strong universality and can better reflect the intrinsic characteristics of passive imaging. We focus on the discussion of imaging performance from the perspective of spatial spectrum filling, and qualitatively analyze the influence of transceiver numbers, inversion algorithms and motion factors on the imaging results, so as to provide technical guidance for designing imaging system using non-cooperative illuminators. Theoretical derivation and simulation results confirm the effectiveness of related analysis.
In this paper, a detection method of INS horizontal and azimuth reference datum deviation is designed, by using an electronic level meter and two electronic theodolite, which refers to water platform and azimuth reference mirror. The method has good results in practicability, under the condition of the laboratory.