Abstract:

Triple-frequency carrier-phase combinations can improve the success rate of ambiguity resolution and the reliability of cycle-slips detection and repair. In this paper, noise amplification factor of combinations is expressed as the function of two parameters which are related to the wavelength and ionospheric scale factor of combinations respectively, and then an analytical method for solving optimal linear coefficients with minimal noise amplification factor is presented, when the wavelength and ionospheric scale factor of combinations are given. It is shown that the ionospheric amplification factor of combinations with long wavelength and low noise increased when the sum of the linear coefficients increased, and the ionospheric amplification factor is about 2.3 times of the sum. Furthermore, the wavelength of combinations with small ionospheric amplification factor and low noise decreased when the sum of linear coefficients increased.

Key words: GNSS, COMPASS, triple-frequency, analytical method, optimal combination