Annex C: Installation details for road surveillance Roadside surveillance radars are typically mounted on existing highway infrastructure, either gantries or on CCTV posts. In some cases, dedicated radar posts are installed if no suitable mounting locations exist on current infrastructure. Figure Example radar sensor locations, Courtesy of Navtech Radar Ltd The typical mounting height for fixed infrastructure radar is approx. 5 meters above the road surface. Radar are always mounted on threaded studs, and adjusted during the installation procedure so as to scan parallel to the road surface .Figure and . Figure Levelling adjustment on threaded mounting bolts Figure Radar mounting posts, courtesy of Navtech radar Ltd Figure Diagram showing radar scanning road The scanner is rotating at 2Hz, thus illuminating any point on the road twice per second. Annex D: SEAMCAT Study Fixed and Vehicular Radars – A statistical modelling of the interference between a typical infrastructure radar and vehicular radar, hereafter referred as SRR, has been performed with a Monte-Carlo simulation method using Seamcat. The software evaluates the probability of interference due to the signal (I) generated by an Interferer and compares this to the noise level (N) of the victim receiver. The criterion used is I/N to be lower than 0 dB, i.e. that the interference is seen as normal noise. To prepare the simulation it is required to provide the characteristics of the potential interferer (the infrastructure radar) and the victim receiver (the vehicular radar). For each of those, the main information required are the antenna pattern, the emitted power and the position and pointing. The antenna characteristics of the infrastructure radar have been investigated and are discussed in D.1 Radar Antenna Specs, whilst the SRR characteristics were obtained from the Mosarim No. 248231 D1.7 report. Further characteristics are included from ETSI EN301091[i.8] Two different scenario were simulated: in one case the interferer is infrastructure radar mounted at 5 metres and victim SRR receivers are distributed up to 500 metres in range and 10 metres in azimuth. The scenario is shown in Figure 24. Figure Scenario outline of the simulation The interfering signal from the fixed radar is simulated (Figure 25) and compared to the noise floor of the victim receiver. The unwanted signal mean value is -110 dBm, below the victim noise level (KTBN) which is typically -95
Annex C: Installation details for road surveillance Roadside surveillance radars are typically mounted on existing highway infrastructure, either gantries or on CCTV posts. In some cases, dedicated radar posts are installed if no suitable mounting locations exist on current infrastructure. Figure Example radar sensor locations, Courtesy of Navtech Radar Ltd The typical mounting height for fixed infrastructure radar is approx. 5 meters above the road surface. Radar are always mounted on threaded studs, and adjusted during the installation procedure so as to scan parallel to the road surface .Figure and . Figure Levelling adjustment on threaded mounting bolts Figure Radar mounting posts, courtesy of Navtech radar Ltd Figure Diagram showing radar scanning road The scanner is rotating at 2Hz, thus illuminating any point on the road twice per second. Annex D: SEAMCAT Study – Fixed and Vehicular Radars A statistical modelling of the interference between a typical infrastructure radar and vehicular radar, hereafter referred as SRR, has been performed with a Monte-Carlo simulation method using Seamcat. The software evaluates the probability of interference due to the signal (I) generated by an Interferer and compares this to the noise level (N) of the victim receiver. The criterion used is I/N to be lower than 0 dB, i.e. that the interference is seen as normal noise. To prepare the simulation it is required to provide the characteristics of the potential interferer (the infrastructure radar) and the victim receiver (the vehicular radar). For each of those, the main information required are the antenna pattern, the emitted power and the position and pointing. The antenna characteristics of the infrastructure radar have been investigated and are discussed in D.1 Radar Antenna Specs, whilst the SRR characteristics were obtained from the Mosarim No. 248231 D1.7 report. Further characteristics are included from ETSI EN301091[i.8] Two different scenario were simulated: in one case the interferer is infrastructure radar mounted at 5 metres and victim SRR receivers are distributed up to 500 metres in range and 10 metres in azimuth. The scenario is shown in Figure 24. Figure Scenario outline of the simulation The interfering signal from the fixed radar is simulated (Figure 25) and compared to the noise floor of the victim receiver. The unwanted signal mean value is -110 dBm, below the victim noise level (KTBN) which is typically -95
ERM-TGSRR-66v111_012.docx