Multipath error analysis of the COMPASS navigation signal with MBOC modulation

Abstract:

In order to quantitatively analyze the multipath error COMPASS navigation signal with MBOC modulation, this paper introduces the principle of the multiplexed binary offset carrier(MBOC), establishes the corresponding multipath signal model, and achieves the formulas of the code tracking error and carrier phase error due to multipath signals using early minus late power (EMLP) discriminator and arctangent discriminator. The multipath performance of MBOC modulated signal is simulated under different multipath-to-direct ratio, correlator spacing, front-end bandwidth, and code tracking error is analyzed in the presence of noise interference. The simulation results demonstrate the corresponding multipath error envelope decreases with multipath to direct ratio decreasing from -3 dB to -6 dB. When MDR is a constant, the multipath error can be well suppressed by applying narrow correlator technology and wider receiver front-end bandwidth. Code tracking error decreases to 0 as the carrier to noise ratio increasing in the presence of noise interference.