Category: Navigation

Navigation: Celestial, Sextant, Equipment

RTL-SDR for AIS on SDRangel & OpenCPN

Introduction AIS Automatic Identification System for Ships is a traffic system that uses VHF transponders on vessels to periodically send out location information. AIS uses two VHF marine channels 87B (161.975 MHz) and 88B (162.025 MHz). Transmission is by 9.6Kbps GMSK modulation (Ref.1). AIS uses navigational information from external on board GPS, Inertial Navigation and Ship Control… Continue reading RTL-SDR for AIS on SDRangel & OpenCPN

VOR VHF Omni-Directional Range – GNU Radio Decoder

Introduction VOR VHF Omni-Directional Range is an aircraft navigational system developed just before WWII and implemented after the war. It operates in the VHF band from 108.0 – 118MHz. In my previous two posts I looked at receiving a local DVOR signal at my home QTH, then using various on line references, I simulated the… Continue reading VOR VHF Omni-Directional Range – GNU Radio Decoder

VOR VHF Omni-Directional Range – Scicos Simulation

Introduction VOR VHF Omni-Directional Range is an aircraft navigational system developed just before WWII and implemented after the war. It operates in the VHF band from 108.0 – 118MHz. In the previous post (Ref.1) I described my attempts at receiving a local VOR signal. The near field VOR receive spectrum is shown in Figure 1.… Continue reading VOR VHF Omni-Directional Range – Scicos Simulation

VOR VHF Omni-Directional Range – Splat! Path Analysis_a

Introduction VOR VHF Omni-Directional Range is an aircraft navigational system developed just before WWII and implemented after the war. It operates in the VHF band from 108.0 – 118MHz (Ref.1). It is gradually being replaced by newer GNSS systems. Nevertheless, I decided that it would be an interesting experiment to receive VOR signals and attempt… Continue reading VOR VHF Omni-Directional Range – Splat! Path Analysis_a