I am trying to calculate the maximum unambiguous range for FMCW automotive radar.
In automotive, the pulse repetition rate (Tp) is typically 50 - 60ms. My equation is as follows:
where c is the speed of light. This becomes
Have I done the above correctly? 7 million metres seems wrong. Is it different as automotive is using FMCW?
For example, a given radar with a linear frequency shift with a duration of 1 ms, can provide a maximum unambiguous range of less than 150 km theoretically. This value results from the remaining necessarily overlap of the transmission signal with the echo signal (see Figure 1) to get enough time for measuring a difference frequency. Most this range can never be achieved due to low power of the transmitter. Thus always remains enough time for a measurement of the difference frequency.
This suggests my calculation is correct but for FMCW the chirp duration is used (in the example 1ms), as answered by Neil_UK