The problem of phase ambiguity resolution and ltering for interferometric GPS attitude determination is considered. Traditionally, the resolution of the phase ambiguity and the ltering stages were performed separately, with the lter formulated on the basis that the phase ambiguity is correctly resolved. Should the pre-processing stage not resolve the ambiguity correctly, erroneous results may o...

Low-density parity-check (LDPC) codes provide capacity approaching performances with very long codes in a coherent channel. However, as the block length increases, their performance becomes worse with residual frequency offsets. Residual frequency offsets can be tackled with sub-block decoding and LDPC code-aided phase ambiguity resolution for binary phaseshift keying (BPSK) signals. Sub-block ...

In this work we propose a novel ap roach for demodulating Continuous Phase Modulation CPM) signals based Q on the modeling of the instantaneous phase as a piecewise polynomial-phase function. The polynomial modeling can be a good approximation for currently used modulations or it can be-exact if the shaping pulse is chosen to be a oiecewise polvnomial function. The crucial step in the demodulat...

It is known that both code and carrier-phase multipath is currently one of a few remaining obstacles against high precision real time positioning. It easily leads to incorrect ambiguity resolution and causes cm-order fluctuations of positioning. If the multipath error in pseudorange fluctuates largely, the initial ambiguity for the satellite is biased and its search space can be enlarged. As a ...

* This work is supported by NSFC under grant No. 41001282. Abstract A fast multi-baseline Interferometric synthetic aperture radar (InSAR) phase ambiguity resolving method is presented. The ambiguity solution vector of the shortest baseline is first computed and used as a reference, and then the ambiguity solutions of all the other baselines are selected with logical judgment of phase differenc...

Carrier phase ambiguity resolution is the key to fast and high precision GPS positioning. Critical in the application of ambiguity resolution is the quality of the computed integer ambiguities. Unsuccessful ambiguity resolution, when passed unnoticed, will too often lead to unacceptable errors in the positioning results. The success or failure of carrier phase ambiguity resolution can be predic...

We discuss range and Doppler processing for FMCW radar using only a single pulse or frequency sweep. The first step is correlation processing, for which the range and Doppler resolution are limited by the ambiguity function. We show that this resolution can be optimized with an additional inverse filtering step. The method is demonstrated for sinusoidal FMCW radar measurements. Several regulari...

Abstract Global Navigation Satellite System carrier phase ambiguity resolution is the key to high precision positioning and navigation. In this contribution a brief review is given of the probabilistic theory of integer carrier phase ambiguity estimation. Various ambiguity estimators are discussed. Among them are the estimators of integer rounding, integer bootstrapping, integer least-squares a...

The local polynomial Fourier transform (LPFT) based algorithm for autofocusing SAR images has recently been proposed by the authors. It produces a well focused image of moving targets, without defocusing stationary targets or inducing undesired cross-terms. The drawback of this algorithm is its high computational burden caused by the large number of elements in the set of used chirp-rates. We p...

In this paper, a Costas loop based method has been presented for digital receivers. The other most commonly used existing method is PLL but it suffer from the drawback of phase ambiguity. The proposed Costas loop overcomes this drawback of phase ambiguity. The proposed Costas loop has been designed and simulated using Simulink and System Generator Blocksets. The results show that the proposed d...