The symmetry in a chirp filter and its application to LPI communication

Author

Lam, Larry

Author_Institution

Lockhead Palo Alto Res. Lab., CA, USA

fYear

1990

fDate

30 Sep-3 Oct 1990

Firstpage

193

Abstract

The even phase symmetry property of a chirp filter is discussed. It is known that significant spectral lines are produced at the output when a binary phase-shift keyed (BPSK) signal is applied to a squaring circuit (SC) or a delay and multiply circuit. These spectral lines can be suppressed by using an even phase symmetric filter. One application of a chirp filter is to transform a conventional direct sequence spread spectrum (DS-SS) low probability of intercept (LPI) signal into a form that is more difficult to detect. Computer simulation results are presented to show the effectiveness of the proposed technique

Keywords

filtering and prediction theory; filters; phase shift keying; signal detection; signal processing; spread spectrum communication; BPSK signal; LPI communication; LPI signal; binary phase-shift keyed; chirp filter; computer simulation; delay and multiply circuit; direct sequence spread spectrum signal; even phase symmetric filter; even phase symmetry; low probability of intercept; signal detection; signal processing; spectral lines; squaring circuit; Application software; Chirp; Circuits; Delay; Filters; Frequency; Radiometry; Signal detection; Spread spectrum communication; Transfer functions;

fLanguage

English

Publisher

ieee

Conference_Titel

Military Communications Conference, 1990. MILCOM '90, Conference Record, A New Era. 1990 IEEE

Conference_Location

Monterey, CA

Type

conf

DOI

10.1109/MILCOM.1990.117411

Filename

117411