The suite of microwave and RF apertures in a fighter, surveillance aircraft or spacecraft might be as many as 20 apertures distributed throughout the vehicle performing radar, data link, navigation, missile warning, direction finding, jamming or other functions over a frequency range covering several decades. There are apertures distributed over the platform that point forward and aft, right and left, as well as up and down. Some apertures will be shared for communications, radio navigation and identification (CNI) as well as identification, friend or foe (IFF) due to compatible frequencies and geometries. Data links such as JTIDS/Link 16 and Link 22 can share apertures with GPS and L-band satellite communications (L-SATCOM). There also may be dedicated data link apertures. EW apertures must be broadband by nature and can be shared with radar warning receivers (RWR), radar auxiliaries and some types of CNI.

Chapter Contents:

• 4.1 Introduction
• 4.2 Sensor signal processing architecture
• 4.3 Sensor data processing
• 4.4 Basic digital signal processing
• 4.4.1 Fast Fourier transforms
• 4.5 Matched filtering and straddling losses
• 4.6 Sliding windows
• 4.7 Analog to digital conversion [9,10]
• 4.8 Digital I/Q demodulation [11]
• 4.9 Polyphase filtering
• 4.10 Pulse compression
• 4.10.1 Linear FM/chirp
• 4.10.2 Stretch processing
• 4.11 Discrete phase codes
• 4.11.1 Effect of Doppler on phase codes
• 4.11.2 Frank and digital chirp codes
• 4.11.3 Complementary codes
• 4.11.4 Type II complementary codes
• 4.11.5 Polyphase complementary codes
• 4.11.6 Polyphase P codes [17,19]
• 4.12 Introduction to Kalman filters [22,23]
• References

Inspec keywords: array signal processing; radar signal processing; radionavigation

Other keywords: sensor signal processing; spacecraft; identification-friend-foe; RWR; JTIDS-Link 16; data link apertures; jamming; EW apertures; GPS; radar auxiliaries; data links; vehicle performing radar; microwave apertures; L-SATCOM; surveillance aircraft; RF apertures; data processing; radar warning receivers; IFF; direction finding; missile warning; CNI; data link; Link 22; L-band satellite communications; radio navigation and identification

Subjects: Signal processing and detection; Radar equipment, systems and applications; Radionavigation and direction finding