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SPEEDBOXINSOption / SingleAntennaINSInstallation

Single Antenna INS Installation

The SPEEDBOX base unit should be mounted inside the vehicle. The base unit can be mounted in any orientation for the SPEEDBOX INS, since the INS system takes all inertial measurements from the antenna assembly. The base unit should be isolated from excessive vibration, and the supplied power cable should be connected to a power supply between 9 and 30V. Power consumption is approximately 0.4A @ 12V for the INS system, but some additional capacity is required at startup.

The antenna assembly should then be mounted on the roof of the vehicle in the correct orientation. Please follow the instructions for mounting the INS single antenna assembly.

Once the base unit and antenna assembly have been correctly fitted, they must be connected using the supplied cable. This cable contains both the data cable for the IMU and the GPS antenna cable. The routeing of the cable from the base unit to the antenna assembly should avoid as far as possible any sources of RF interference, in particular components of the vehicle ignition system, telemetry or radio systems, and in some cases video camera systems.

The data cable from the IMU to the SPEEDBOX base unit connects to the antenna assembly at one end with a “Deutsch” connector and to the “Expansion” port of the SPEEDBOX base unit at the other end with a DB9 connector. Whilst it is possible to connect to either the front or rear expansion port on the SPEEDBOX, it is likely that the rear port will be used in order to ensure that the GPS cables integrated into the main cable can reach the GPS connections. Note that the data cable must be connected prior to switching on the INS system in order for the antenna assembly to be correctly detected – if the power is supplied prior to plugging in the IMU cable then the SPEEDBOX will flash an error code to indicate that the IMU is not detected. In this case it is simply necessary to power-cycle the unit after plugging in the IMU cable.

The GPS cable connects to the GPS antenna on the antenna assembly, and to the GPS connection labelled “RF1” on the SPEEDBOX base unit. Please refer to figure 1 below for clarification.

Figure 1. Single antenna GPS connection to SPEEDBOX base unit.