Pulse Pattern Construction for Time-Hopping Pseudolites With the Generated Congruence Codes

The pulse patterns constructed with existing methods don't perform well in hit property or in pattern number. Aimed at this problem, a new method to construct pulse patterns for multiple time-hopping (TH) pulsed pseudolites (PLs) is proposed. In the proposed method, first different groups of congruence codes are generated; next with the generated congruence codes, different TH slot index (THSI) base matrices are built; then according to the effective data to pseudorandom noise (PRN) code duration ratio of the PL signal, by means of selecting several different THSI base matrices and horizontally concatenating them into one, different THSI tables are formed; finally by way of concatenating each row of a formed THSI table into a sequence and further mapping each entry of the sequence into binary codes, different pulse patterns for different PLs are constructed. The final simulations show that compared with other similar pulse pattern construction methods, the proposed method can give better overall performance in hit property and pattern number, and this will bring more benefits for PL applications.