Systems and methods of calibrating a range measurement system

A range measurement system for a guideway mounted device, comprising:

• a first antenna;
• a first wireless device operably associated with the first antenna and configured to generate a first signal;
• a non-transitory computer readable medium configured to store computer executable instructions;
• at least one microcontroller or central processing unit (MCU/CPU) operably associated with the first wireless device and the non-transitory computer readable medium, wherein, when the at least one MCU/CPU executes the computer executable instructions, the at least one MCU/CPU is configured to:
• measure a first time of transmission (TOT) between the at least one MCU/CPU and an internal component of a wayside range measurement device;
• compare the first TOT with a first pre-determined time;
• and
• determine a health of the range measurement system based on a difference between the first TOT and the first pre-determined time, wherein the internal component is a second CPU or second MCU (second MCU/CPU), wherein the at least one MCU/CPU is configured to measure the first TOT by:
• transmitting a first signal from the MCU/CPU to a first antenna (first transmission)
• transmitting the first signal from the transmitting the first signal wirelessly from the first antenna to a second antenna (second transmission);
• transmitting the first signal from the second antenna to the second MCU/CPU (third transmission);
• transmitting a second signal from the second MCU/CPU to the second antenna (fourth transmission);
• transmitting the second signal wirelessly from the second antenna to the first antenna (fifth transmission);
• transmitting the second signal from the first antenna to the MCU/CPU (sixth transmission);
• measuring a combined TOT of first transmission, the second transmission, the third transmission, the fourth transmission, the fifth transmission, and the sixth transmission as the first TOT.

A method of calibrating a range measurement system for a vehicle mounted on a guideway, the method comprising:

• measuring a first time of transmission (TOT) between a first internal component of a first wayside range measurement device and a second internal component of a second wayside range measurement device;
• comparing the first TOT with a first pre-determined time;
• and
• determining a health of the range measurement system based on a difference between the first TOT and the first pre-determined time;
• measuring a second TOT between the first internal component of the first wayside range measurement device and a third internal component of a third wayside range measurement device;
• measuring a third TOT between the second internal component of the second wayside range measurement device and the third internal component of the third wayside range measurement device;
• comparing the second TOT with a second pre-determined time;
• comparing the third TOT with a third pre-determined time;
• and
• wherein the determining the health of the range measurement system is based on the difference between the first TOT and the first pre-determined time, a difference between the second TOT and the second pre-determined time, and a difference between the third TOT and the third pre-determined time.