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access icon free Proposal of spread spectrum MSK for BDS RDSS signal modulation

© The Institution of Engineering and Technology
Received 30/10/2019, Accepted 27/01/2020, Revised 13/01/2020, Published 03/02/2020

BPSK is the basis of current GNSS (Global Navigation Satellite System) signals. BDS (Beidou navigation satellite system) RDSS (Radio Determination Satellite Service) system also adopts BPSK to realize communication and ranging simultaneously. To realize higher system capacity, RDSS signals overlap in time and frequency domain. The signal performance is heavily determined by the MAI (Multiple Access Interference) between overlapping signals. In this paper, SSMSK (spread spectrum MSK) is proposed. The signal performance is investigated under four conditions considering the main lobe bandwidth and the receiver bandwidth. The maximum number of overlapping signals for SSMSK is 11.7% higher than BPSK when the receiver bandwidth is for the side subcarrier. And the value is 10.6% when the receiver bandwidth is. SSMSK can be received utilizing BPSK local signal. When the receiving bandwidth is , the correlation peak of SSMSK_BPSK is identical to BPSK. The tracking accuracy of SSMSK is higher than BPSK when the correlation interval is between 0.2-1 chips. The accuracy of SSMSK_BPSK is higher than BPSK when the correlation interval is 0.5 chips. The disadvantage of SSMSK is larger quantization word length. SSMSK is a better modulation for RDSS based on the comprehensive performance.

Inspec keywords: frequency-domain analysis; satellite navigation; time-domain analysis; phase shift keying; multi-access systems; radio receivers; minimum shift keying; spread spectrum communication; radiofrequency interference

Other keywords: overlapping signals; Radio Determination Satellite Service; BDS RDSS signal modulation; SSMSK_BPSK; time domain; BeiDou navigation satellite system; tracking performance; BDS RDSS system; acquisition performance; spread spectrum minimum shift keying; main lobe bandwidth; BPSK local signal; frequency domain; signal performance; binary phase-shift keying; GNSS signals; receiver bandwidth; Global Navigation Satellite System; multiple access interference; side subcarrier

Subjects: Electromagnetic compatibility and interference; Mathematical analysis; Satellite communication systems; Radionavigation and direction finding; Modulation and coding methods; Multiple access communication

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