Abstract:

Considering effects of radio frequency interference on the stability of tracking loop and ranging accuracy, the AJ margin of system stability and AJ margin of ranging accuracy are derived and defined, and the two margins are integrated into AJ margin of ranging system with certain ranging accuracy requirement. To quantitatively analyze the weight of two former margins in the later margin, a reference factor is designed, and rapid calculation methods for the AJ margin and reference factor in certain application scenario are provided. For narrow-band interference condition, a simpler method is given, and numerical analysis is provided with more detailed description. The design and analysis of the AJ margin are comprehensive and simple, which is quite useful in the structural parameters design and performance evaluation of pseudo-random code ranging system.

Key words: Pseudo-random code ranging, Anti-jamming margin, System stability, Ranging accuracy, Reference factor