GNSS Single Frequency, Single Epoch Reliable Attitude Determination Method with Baseline Vector Constraint.

Area of Science:

• Geomatics Engineering
• Satellite Navigation Systems
• Geodetic Surveying

Background:

• Accurate attitude determination is crucial for various GNSS applications.
• Traditional methods often face challenges in reliability and success rates for single-epoch solutions.
• Existing constraints, like baseline length, may not fully leverage available prior information.

Purpose of the Study:

• To propose a novel and reliable method for single-frequency, single-epoch attitude determination using Global Navigation Satellite System (GNSS).
• To enhance the accuracy and success rate of attitude determination by incorporating a baseline vector constraint.
• To improve the search strategy for ambiguity resolution in GNSS attitude determination.

Main Methods:

• Reconstruction of the objective function using prior knowledge of baseline length, heading, and pitch.
• Implementation of an improved searching strategy with a gradually enlarged ellipsoidal search space.
• Application of the least squares ambiguity decorrelation algorithm (LAMBDA) for ambiguity searching.
• Elimination of candidate vectors using a derived approximate inequality to accelerate the process.

Main Results:

• The new method demonstrates higher reliability and success rates compared to traditional methods using only baseline length constraints.
• Utilizes a priori three-dimensional baseline knowledge for reliable ambiguity fixing.
• Experimental results show robustness against minor baseline vector errors and angular deviations.

Conclusions:

• The proposed method effectively improves the reliability and success rate of GNSS attitude determination.
• Incorporating a priori baseline vector information significantly enhances positioning accuracy.
• The method is robust and performs well under typical error conditions, making it suitable for practical applications.