BACK|
United States Patent [19] |
[11] Patent Number: 4,510,495 |
|
Sigrimis et al. |
[45] Date of Patent: Apr. 9,1985 |
[54] REMOTE PASSIVE IDENTIFICATION SYSTEM
[75] Inventors: Nick A.Sigrimis, Athens, Greece;
Norman R.Scott, Ithaca, N.Y.
[73] Assignee: Cornell Research Foundation, Inc., Ithaca, N.Y.
[21] Appl.No.: 406,471
[22] Filed: Aug.9,1982
[51] Int. Cl. H04Q 9/00; G01S 9/56
[52] U.S. Cl. 340/825.54; 340/825.72;
343/6.5 SS; 119/51 R
[58] Field of Search 340/825.54, 825.31,
340/825.72; 343/6.8 R, 6.5 SS; 119/51 R
[56] References Cited
U.S. PATENT DOCUMENTS
|
3,516,575 |
6/1970 |
Moffitt |
|
|
3,541,995 |
11/1970 |
Fathauer |
119/51 R |
|
3,897,753 |
8/1975 |
Lee |
119/51 R |
|
3,929,277 |
12/1975 |
Byrne et al. |
119/51 R |
|
3,944,928 |
3/1976 |
Augenblick et al. |
343/6.8 R |
|
3,964,024 |
6/1976 |
Hutton et al. |
343/6.8 LC |
|
4,036,178 |
7/1977 |
Lee et al. |
119/51 R |
|
4,040,053 |
8/1977 |
Olsson |
343/6.5 SS |
|
4,049,950 |
9/1977 |
Byrne et al. |
119/51 R |
|
4,065,753 |
12/1977 |
Paul, Jr. |
119/1 |
|
4,075,632 |
2/1978 |
Baldwin et al. |
343/6.8 R |
|
4,087,791 |
5/1978 |
Lemberger |
343/6.5 SS |
|
4,129,855 |
12/1978 |
Rodrian |
119/51 R |
|
4,196,418 |
4/1980 |
Kip et al. |
340/825.31 |
|
4,242,663 |
12/1980 |
Slobodin |
343/6.5 SS |
|
4,262,632 |
4/1981 |
Hanton et al. |
119/51 R |
|
4,274,083 |
6/1981 |
Tomoeda |
340/572 |
|
4,388,524 |
6/1983 |
Walton |
340/825.72 |
OTHER PUBLICATIONS
Koelle et al., "Short-Range Passive Telemetry by Modulated Back-Scatter
of Incident CW RF Carrier Beam,"Third International Symposium of
biotelemetry(undated).
Holm, Dale M., "Development of a National Electronic Identification System for Livestock", American Society of Animal Science Meeting, Jul. 30, 1979.
Holm, Dale E. et al., "Electronic Identification and Temperature Monitoring-1978", Livestock Conservation Institute Meeting, May 18, 1978.
Bobbett, R.E. et al., "Description of a Passive Temperature Telemetry System", Los Alamos Scientific Laboratory Informal Report, Feb., 1977.
Street, M. J., "A Pulse-Code Modulation System for Automatic Animal Identification", Journal of Agricul-tural Engineering Res., 1979, pp. 249-258.
Primary Examiner-Donald J.Yusko
Attorney, Agent, or Firm - Sughrue, Mion, Zinn,Macpeak,and Seas
[57]
ABSTRACT
A system for passively identifying remote objects suchas livestock is
disclosed. A power transmitter transmits a plurality of radio frequency
burst signals at a given frequency, and a uniquely coded transponder associated
with the object to be identified produces a plurality of coded identification
signals in response to the burst signals from the transmitter. The coded
identification signals are read by a receiver to identify the object.
The transmitter and receiver are time division multiplexed for alternate
operation. Accordingly, when an object is to be identified, the transmitter
is switched on to transmit the burst signals, thereby activating the transpoder
to produce the coded identification signals. The transmitter is then switched
off and the receiver switched on to receive the identificationsignals
for identifying the object.