Title :
A DSP-based microwave landing system (MLS) post-IF processor
Author :
Koczo, Stefan ; Clark, Anne Wharton
Author_Institution :
Rockwell Int. Corp., Cedar Rapids, IA, USA
Abstract :
The authors describe the digital signal processor (DSP)-based implementation of the microwave landing system´s (MLS´s) post-IF processing functions. An MLS overview, the DSP-based post-IF processing module and MLS post-IF processing algorithms are discussed. All MLS post-IF processing functions, including carrier acquisition, differential phase shift keying (DPSK) demodulation and synchronization, data decoding and scanning beam processing are implemented in a single DSP, Analog Devices´ ADSP2100A. An input signal sampling rate of 25 Ks/sec is accommodated by using decimating filters, a modified fast Fourier transform algorithm, and by setting up a direct memory access between the analog-to-digital (A/D) converter and memory
Keywords :
aircraft instrumentation; analogue-digital conversion; computerised signal processing; decoding; demodulation; digital signal processing chips; fast Fourier transforms; phase shift keying; signal processing equipment; A/D convertor; ADSP2100A; MLS; algorithms; carrier acquisition; computerised signal processing; data decoding; decimating filters; demodulation; differential phase shift keying; digital signal processor; direct memory access; fast Fourier transform algorithm; microwave landing system; module; post-IF processor; synchronization; Decoding; Demodulation; Differential phase shift keying; Differential quadrature phase shift keying; Digital signal processing; Digital signal processors; Filters; Multilevel systems; Signal processing algorithms; Signal sampling;
Conference_Titel :
Digital Avionics Systems Conference, 1991. Proceedings., IEEE/AIAA 10th
Conference_Location :
Los Angeles, CA
DOI :
10.1109/DASC.1991.177192
