By Dabove, Paolo; Manzino, Ambrogio; De Agostino, Mattia
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Additional info for Achievable positioning accuracies in a network of GNSS reference stations
The local reference mixer LUT must cater for the complex correlation operation. There are basically two ways to realise this complex reference signal mixer: with the logic or with LUTs. With the logic one would be using adders/subtracters and multipliers of appropriate length to compute the reference signal mixer outputs. With the LUT, there are many ways, each using different sizes of the LUT. In both the cases the resource requirement would signiﬁcantly increase compared to the GPS L1 C/A correlator (which requires no reference signal mixer).
Following this technique, the decision variable of the MGDC technique is S MGDC = M −1 ∑ i =1 | A i |. (40) If the noise is neglected, (40) becomes S MGDC = M −1 ∑ i =1 | AiS | = |( M − 1) G2 e j2π +| G2 e j2π ( M−1) f d Tint 2 f d Tint 2 | + |( M − 2) G2 e j4π f d Tint 2 | + ... | = ( M − 1) G2 + ( M − 2) G2 + ... + G2 = (41) M ( M − 1) 2 G 2 By forming the decision variable in this way, the unpredictable loss caused by the residual carrier phase is canceled completely. However, the non-coherent integrations between all the spans make the noise averaging process worse than for GDC.
During the signal acquisition or during the tracking if there is a requirement for more than one GNSS channel to use the same PRN, then the memory block will have to have more than one port which is expensive in terms of the resource and power consumption. e. the Nacc requirement increases (assuming that the accumulator is used to integrate the correlation values for the duration of one code period). 1 Two-level (1-bit) subcarriers With the subcarrier modulation an additional NCO, subcarrier generator and subcarrier modulator may be required depending on the requirement of the tracking loops.