SITL: change ADSB_VEHICLE update rate to 1Hz instead of 2Hz to match PING behavior

libraries/SITL/SIM_ADSB.cpp

@@ -187,7 +187,7 @@ void ADSB::send_report(void)
       send a ADSB_VEHICLE messages
      */
     uint32_t now_us = AP_HAL::micros();
-    if (now_us - last_report_us > reporting_period_ms*1000UL) {
+    if (now_us - last_report_us >= reporting_period_ms*1000UL) {
         for (uint8_t i=0; i<num_vehicles; i++) {
             ADSB_Vehicle &vehicle = vehicles[i];
             Location loc = home;

libraries/SITL/SIM_ADSB.h

@@ -57,7 +57,7 @@ private:
     ADSB_Vehicle vehicles[num_vehicles_MAX];
     
     // reporting period in ms
-    const float reporting_period_ms = 500;
+    const float reporting_period_ms = 1000;
     uint32_t last_report_us = 0;
     uint32_t last_update_us = 0;