There are 2 traces in this traceset
- download the fingerprint.tar.gz file
- from a CRAWDAD mirror: US
UK
size="800KB" type="gz" md5="5c9ff63c085c0e4f900eb9066393460d"
- download the floorplan-fingerprint.png file
- from a CRAWDAD mirror: US
UK
size="64KB" type="Figure: floor plan for mannheim/compass/fingerprint" md5="da77ff953cf3d58272725f12fb29df35"
- last modified
-
2008-05-15
- short description
-
A traceset of signal strength collected from 802.11 APs for the COMPASS positioning system
- description
-
A traceset of signal strength collected from 802.11 APs for the location estimation used by the COMPASS positioning system.
- reason for most recent change
-
the initial version
- release date
-
2008-04-11
- date/time of measurement start
-
2006-08-24
- date/time of measurement end
-
2006-08-24
- methodology
-
1. Local Test Environment We deployed our 802.11-based positioning system on the second floor of our office building on the campus of the University of Mannheim. The operation area is nearly 57 meters in width and 32 meters in length; approximately 221 square meters are covered. The floor plan of the operation area is shown in [Figure: floor plan for mannheim/compass/fingerprint]. - Hardware and Software Setup
Initially, the test environment was covered by twelve access points. Seven of them are administered by the computer center of our university. The other five are installed in nearby buildings and offices. We additionally installed thirteen access points. Our data show that most of the access points cover only parts of the operation area. In fact, only two access points cover the operation area completely. One of these access points is the one marked in the middle of the storage room in the horizontal hallway in the right part of the building. This access point is located in a suspended ceiling on top of this room. The position of the second access point is in an office one floor below our operation area. The positions of the access points that are located on the same floor and inside the same building parts as our operation area are marked by orange circles in [Figure: floor plan for mannheim/compass/fingerprint]. As a client, we used a Lucent Orinoco Silver PCMCIA network card supporting 802.11b. This card was plugged into an IBM Thinkpad R51 running Linux kernel 2.6.13 and Wireless Tools 28pre. To collect signal strength samples, we implemented our own set of tools called "Loc{lib,trace,eva,ana}".
the mannheim/compass/fingerprint/offline trace
- last modified
-
2008-05-15
- short description
-
A trace of signal strength values from 802.11 APs measured at reference points for different orientations.
- description
-
A trace of signal strength values from 802.11 APs measured at reference points for different orientations for the offline phase of the COMPASS positioning system.
- reason for most recent change
-
the initial version
- derived
-
false
- release date
-
2008-04-11
- date/time of measurement start
-
2006-08-24
- date/time of measurement end
-
2006-08-24
- configuration
-
The grid of reference spots in the operation area includes 130 spots with a spacing of 1.5 meters (see the blue marks in [Figure: floor plan for mannheim/compass/fingerprint]). During the training phase, we collected 110 signal strength samples at each reference spot.
- format of trace data
-
t="Timestamp"; id="MACofScanDevice"; pos="RealPosition"; degree="orientation"; "MACofResponse1"="SignalStrengthValue","Frequency","Mode"; ... "MACofResponseN"="SignalStrengthValue","Frequency","Mode"
t: timestamp in milliseconds since midnight, January 1, 1970 UTC
id: MAC address of the scanning device
pos: the physical coordinate of the scanning device
degree: orientation of the user carrying the scanning device in degrees
MAC: MAC address of a responding peer (e.g. an access point or a device in adhoc mode)
with the corresponding values for signal strength in dBm, the channel frequency and
its mode (access point = 3, device in adhoc mode = 1)
the mannheim/compass/fingerprint/online trace
- last modified
-
2008-05-15
- short description
-
A trace of signal strength, which is derived from mannheim/compass/fingerprint/offline.
- description
-
A trace of signal strength, which is derived from mannheim/compass/fingerprint/offline for online phase of the COMPASS positioning system.
- reason for most recent change
-
the initial version
- derived
-
true
- release date
-
2008-04-11
- date/time of measurement start
-
2006-08-24
- date/time of measurement end
-
2006-08-24
- configuration
-
For the position determination phase, we randomly selected 46 spots. Again, we collected 110 signal strength samples for each positioning spot. In [Figure: floor plan for mannheim/compass/fingerprint], the positioning spots are marked by purple dots. We spent more than ten hours to collect all the data.
- format of trace data
-
t="Timestamp"; id="MACofScanDevice"; pos="RealPosition"; degree="orientation"; "MACofResponse1"="SignalStrengthValue","Frequency","Mode"; ... "MACofResponseN"="SignalStrengthValue","Frequency","Mode"
t: timestamp in milliseconds since midnight, January 1, 1970 UTC
id: MAC address of the scanning device
pos: the physical coordinate of the scanning device
degree: orientation of the user carrying the scanning device in degrees
MAC: MAC address of a responding peer (e.g. an access point or a device in adhoc mode)
with the corresponding values for signal strength in dBm, the channel frequency and
its mode (access point = 3, device in adhoc mode = 1)
how to cite this traceset
When writing a paper that uses CRAWDAD tracesets, we would appreciate it if you could cite both the authors of the traceset and CRAWDAD itself, and identify the exact traceset using the appropriate version number. For this traceset, this citation would look like:
Thomas King, Stephan Kopf, Thomas Haenselmann, Christian Lubberger, Wolfgang Effelsberg, CRAWDAD dataset mannheim/compass (v. 2008‑04‑11), traceset: fingerprint, downloaded from https://crawdad.org/mannheim/compass/20080411/fingerprint, https://doi.org/10.15783/C7F30Q, Apr 2008.
We also provide bibliographic information in common citation formats below:
@misc{mannheim-compass-20080411,
author = {Thomas King and Stephan Kopf and Thomas Haenselmann and Christian Lubberger and Wolfgang Effelsberg},
title = {{CRAWDAD} dataset mannheim/compass (v. 2008-04-11)},
howpublished = {Downloaded from \url{https://crawdad.org/mannheim/compass/20080411/fingerprint}},
note = {traceset: fingerprint},
doi = {10.15783/C7F30Q},
month = apr,
year = 2008
}
Copy to clipboard
Download
TY - DATA
TI - CRAWDAD dataset mannheim/compass (v. 2008-04-11)
T2 - traceset: fingerprint
UR - https://crawdad.org/mannheim/compass/20080411/fingerprint
PY - 2008/04/11/
AU - Thomas King
AU - Stephan Kopf
AU - Thomas Haenselmann
AU - Christian Lubberger
AU - Wolfgang Effelsberg
DO - 10.15783/C7F30Q
ER -
Copy to clipboard
Download
If you do not use the provided citation formats, please include a reference with the same information, as described in the CRAWDAD FAQ.
|