phased.Ran​geDopplerR​esponse axis scaling

Hello all,

how does the phased.RangeDopplerResponse compute range & velocity axis?

So far I understood that the simulations on basis of the phased array system toolbox e.g. openExample('phased/FMCWExample') rely on a complex baseband architecture using I&Q channels. Therefore, the sampling rate fs should be larger/equal the maximum beat frequency and not twice as large as the maximum beat frequency as in case of real baseband architecture. Is that correct?

Furthermore, does the phased.Ran​geDopplerR​esponse system object perform some sort of Image reject filtering as described in http://www.ti.com/lit/wp/spyy007/spyy007.pdf

Thank you!

Dominic

Answer 1

[Honglei Chen]

The input of RangeDopplerResponse is a matrix reprsents fast time and pulses. Therefore, if you have a TDM MIMO radar, you can either use the received signal at a give element or do beamforming across the virtual array to obtain such an input. Once you get that matrix, the NTx and NRx no longer affect your result. They only play a role when you do beamforming

The fast time of a MIMO radar is the same as a regular radar, so nothing special on that dimension. For velocity, you need to provide the correct PRF. Because you do TDM, you need multiple pulses to construct one virtual array. Therefore you must take that into consideration and provide correct PRF information.

HTH

[ali]

Can you clarify why the range axis has negative values?