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The high frequency of the image pre-filtering and sampling can not be eliminated, whereby the power spectrum of the oscillation may cause aliasing, the sampling scheme proposed two standard blue noise pattern: step blue noise and single-peak blue noise, two blue noise sampling task performance in the image plane of the well, as can the other at least in the low frequency band sampling mode, and in...
The synthetic aperture digital radiometer (SADR) is a new type of passive remote sensing instrument that can reach high spatial resolution. The phase coherence is essential to image of SADR. The sampling error of digital radiometer will affect the correlation, result in imaging sensitivity degraded. This paper analyzes the effect on image sensitivity of SADR by sampling error of multi-channel digital...
Two-dimensional microwave imaging radiometers (TDMIR) are potential powerful instruments for high resolution observation of planetary surfaces. The prototype of TDMIR based on minimum-redundancy linear array and mechanical scanning is described. This paper deals with the reconstruction of radiometric brightness temperature maps from TDMIR measurements. Due to the inherent physical properties of passive...
This paper presents a novel microstrip triple-mode bandpass filter. Three modes are achieved by adding a microstrip line to a square-loop resonator. The relation between the length of the inset microstrip line and the modes-shifting characteristic is studied. Odd mode and even mode theory is applied to analysis this new proposed resonator. A triple-mode bandpass filter in 3.5GH-band is designed based...
A Simulated Annealing based array design for direction-of-arrival (DOA) is introduced in this paper. Decoherent Multichannel Signal Classification (DMUSIC) algorithm is applied for the design method. Simulations have been made to test the performance of the proposed method. Finally, the summary is made that the method is both efficient and accurate.
L-band direct sampling microwave radiometer (DSMR) is a novel radiometer, which trades analog complexity for digital ditto. This article analyzes the sensitivity of the DSMR and gives the mathematical expression of sensitivity of DSMR; using a method of spectral estimation to improve the sensitivity of DSMR. The experimental results show that the proposed method gives predictions in agreement with...
A new type of microstrip dual-mode microstrip filter using spurlines and L-shape slot is proposed in this letter. It is found interestingly that the embedded spurlines and slot can excite, couple and split the degenerate modes. Moreover, the transmission characteristics of the loop resonator can be controlled by adjusting the length of the embedded L-shaped slot appropriately. Parameter study of the...
A novel ultra-wideband bandpass filter based on a cross-shaped triple-mode microstrip resonator is proposed in this paper. The cross-shaped resonator is realized by loading two open-stubs at the center of a microstrip resonator. Circuit model for the resonator is studied and analysised. Resonance of Even and odd modes of the resonator can be fully controlled by changing the length of the resonator...
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