Kotegawa Figure 4. Honeywell STM sample surveillance data. Figure 5. Honeywell STM sample surveillance data and track output. truder tracks. TCAS measurements are scattered as compared with ADS-B due to measurement characteristics of active surveillance. The horizontal radar measurements correspond very closely to the horizontal ADS-B measurements, however the vertical radar measurements are generally within 100-200 m of the vertical ADS-B SEPTEMBER 2016 measurements. HTS did not receive any ADS-B or TCAS broadcast from ICAO ID 11264663 for a portion of the recording due to the 20 nmi range filter. Figure 5 shows the tracks generated by HTS using surveillance measurements in Figure 4. The estimated tracks are repre- IEEE A&E SYSTEMS MAGAZINE 57