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From: | Marcus D. Leech |
Subject: | Re: [Discuss-gnuradio] [USRP-users] How to correct for the drift in an (FMCW) Rx signal? |
Date: | Fri, 28 Nov 2014 16:14:44 -0500 |
User-agent: | Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.24) Gecko/20111108 Fedora/3.1.16-1.fc14 Thunderbird/3.1.16 |
On 11/28/2014 03:41 PM, khalid.el-darymli wrote:
Khalid: Thanks very much for the very-extensive data. My main concern, as one of the Ettus support team, was that there was something wrong with the hardware, but the magnitude of both the apparent phase and magnitude drift is entirely consistent with analog-hardware temperature effects, unrelated to clock stability, etc. Coax cables, for example, will change their loss characteristics and *effective length* with temperature, so with precise hardware like USRPs, it's easy to see these effects. FMCW radar isn't my area of expertise, so hopefully others can comment on RX-processing strategies to deal with this, as it *must* also be a problem with non-SDR FMCW radar implementations.
-- Marcus Leech Principal Investigator Shirleys Bay Radio Astronomy Consortium http://www.sbrac.org |
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