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
Author: Jeremy Clark
Jeremy Clark is a Senior Telecommunications Engineer and Advanced Amateur Radio Operator VE3PKC. He is the author of E-Books on Telecommunications, Navigation & Electronics.
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
RTL-SDR for VHF Air Band AM on GNU Radio
Introduction In previous posts we looked at various ways to use the RTL-SDR with GNU Radio on either Raspberry Pi4 or Windows. In this post we look at the RTL-SDR for VHF Air Band (108-137MHz) reception on GNU Radio. The latest version of GNU Radio >=3.8xx is used (Ref.1). RTL-SDR for Air Band Setup The… Continue reading RTL-SDR for VHF Air Band AM on GNU Radio