Meaning of EPR in Radar detection

[Jooyandeh]

TL;DR

Meaning of EPR of a non-jet drone in radar detection

Salaam
I was reading an article about Lancet UAVs. Somewhere in the article, it says:

...electronic warfare equipment does not interfere with the Lancet’s operation, the low EPR makes it possible to remain undetected by enemy air defence radars,...

I wonder if EPR here refers to Electron Spin Reseonance or Engine Pressure Rate? Since the above-said Lancets don't have jet engines, I thought it latter could not have been intended here.

Thanks in advance for your help.

 

[Baluncore]

Welcome to PF.

EPR is maybe a typo of ERP.
Effective radiated power (ERP), synonymous with equivalent radiated power, is an IEEE standardized definition of directional radio frequency (RF) power, such as that emitted by a radio transmitter.

 

[Klystron]

Most serious technical articles define an acronym with first use. The OP's excerpt lacks detailed information for analysis. Guessing that Lancet UAV refers to Russian ZALA electric-engine drones, this excerpt from a nontechnical article may be relevant to the sentence fragment.

ZALA drones use radio frequencies in the bands 868-870 MHz and 902-928 MHz... Lancet operates on two frequency channels with a reserve frequency to complicate jamming, ...

Assumming EPR is not a typo, more guesswork indicates the acronym "PR" associated with radar often refers to "pulse rate" or "pulse repetition" also depending on active or passive operation.