Improvements in and relating to live monitoring of projectiles

A method of transmitting data using a data transmission system for use with a projectile, the projectile being arranged for firing from an artillery piece, the method comprising:

• detecting information, via at least one sensor, related to at least one parameter and producing a sensor voltage output from the at least one sensor;
• passing the sensor voltage output through a first voltage-controlled oscillator to produce an output signal with a frequency proportional to the sensor voltage output;
• generating encoded data, whereby the output of the first voltage-controlled oscillator selects one of two signal streams having different properties, wherein the different properties are configured to encode for different logical states;
• and
• transmitting the encoded data signal.

A system comprising:

• a sensor arranged to sense at least one parameter associated with a projectile, the projectile arranged for firing from an artillery piece, the sensor producing an output;
• a voltage-controlled oscillator (VCO) configured to produce an output having a frequency proportional to the output of the sensor;
• an encoder configured to generate an encoded data signal, the encoded signal comprising a logic state, wherein a value of the logic state is responsive to the output of the VCO;
• and
• a transmitter configured to transmit the encoded data signal.