US4802216A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Interrogator and transponder test equipment
Assignee: Raytheon Co
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Filing: 1987-10-15
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Granted: 1989-01-31
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Expires: 2007-10-15
Abstract
Abstract Test equipment is described for testing a transponder and an interrogator positioned in close proximity to one another to cause suppression of its receivers while either transponder or interrogator is transmitting incorporating an RF receiver, detector, shift register, timing controller, modulator and RF transmitter. The invention overcomes the problem of testing an interrogator and transponder with cryptograms that must be generated or stored in the test equipment and overcomes the problem of requiring two test sets for testing the interrogator and transponder.
Inventors
- 👤 David J. Irwin
- 👤 John T. Shaul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:25
CPC Classifications
G; G01; G01S; G01S7/00; G01S7/02; G01S7/40; G01S7/4052; G01S7/4082; G01S13/00; G01S13/74; G01S13/76; G01S13/767
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
195 words
A method for testing with test equipment a transponder and an interrogator positioned in close proximity to one another and interconnected with respective suppression signals to cause suppression of its receivers while either transponder or interrogator is transmitting comprising the steps of initiating the interrogator to transmit a first message, receiving with said test equipment said first message from said interrogator, demodulating and storing said first message in said test equipment, retransmitting with said test equipiment said first message with the modulation and at the frequency as received with said first message after a first time interval, said transponder operative to receive said retransmitted first message and to generate and transmit a reply message in response to receiving said retransmitted first message, receiving with said test equipment said reply message from said transponder, demodulating and storing said reply message in said test equipment, retransmitting with said equipment said reply message with the modulation and at the frequency as received with said reply message after a second time interval, said interrogator operative to receive said retransmitted reply message and to generate friend or foe signals to an indicator in response to receiving said retransmitted reply message.
Claim 2
Independent Claim
195 words
A method for testing with test equipment a transponder and an interrogator positioned in close proximity to one another and interconnected with respective suppression signals to cause suppression of its receivers while either transponder or interrogator is transmitting comprising the steps of initiating the interrogator to transmit a first message, receiving with said test equipment said first message from said interrogator, demodulating and storing said first message in said test equipment, retransmitting with said test equipiment said first message with the modulation and at the frequency as received with said first message after a first time interval, said transponder operative to receive said retransmitted first message and to generate and transmit a reply message in response to receiving said retransmitted first message, receiving with said test equipment said reply message from said transponder, demodulating and storing said reply message in said test equipment, retransmitting with said equipment said reply message with the modulation and at the frequency as received with said reply message after a second time interval, said interrogator operative to receive said retransmitted reply message and to generate friend or foe signals to an indicator in response to receiving said retransmitted reply message.
Claim 3
Dependent Claim
13 words
The method of claim 1 wherein said first message is a first cryptogram.
Claim 4
Dependent Claim
28 words
The method of claim 1 wherein said step of demodulating and storing said first message includes storing said first message in said test equipment in a shift register.
Claim 5
Dependent Claim
13 words
The method of claim 1 wherein said reply message is a first cryptogram.
Claim 6
Dependent Claim
13 words
The method of claim 2 wherein said reply message is a second cryptogram.
Claim 7
Dependent Claim
20 words
The method of claim 1 wherein said first time interval exceeds the suppression signal time interval generated by the interrogator.
Claim 8
Dependent Claim
20 words
The method of claim 1 wherein said second time interval exceeds the suppression signal time interval generated by the transponder.
Claim 9
Dependent Claim
169 words
Apparatus for testing a transponder and an interrogator positioned in close proximity to one another and interconnected with respective suppression signals to cause suppression of its receivers while either transponder or interrogator is transmitting comprising, means for receiving a first message from said interrogator, means for demodulating and storing said first message, means for retransmitting said first message with the modulation and at the frequency as received with said first message after a first time inverval, said transponder operative to receive said retransmitted first message and to generate and transmit a reply message in response to receiving said retransmitted first message, means for receiving said reply message from said transponder, means for demodulating and storing said reply message, means for retransmitting said reply message with the modulation and at the frequency as received with said reply message after a second time interval, said interrogator operative to receive said retransmitted reply message and to generate friend or foe signals to an indicator in response to receiving said retransmitted reply message.
Claim 10
Dependent Claim
169 words
Apparatus for testing a transponder and an interrogator positioned in close proximity to one another and interconnected with respective suppression signals to cause suppression of its receivers while either transponder or interrogator is transmitting comprising, means for receiving a first message from said interrogator, means for demodulating and storing said first message, means for retransmitting said first message with the modulation and at the frequency as received with said first message after a first time inverval, said transponder operative to receive said retransmitted first message and to generate and transmit a reply message in response to receiving said retransmitted first message, means for receiving said reply message from said transponder, means for demodulating and storing said reply message, means for retransmitting said reply message with the modulation and at the frequency as received with said reply message after a second time interval, said interrogator operative to receive said retransmitted reply message and to generate friend or foe signals to an indicator in response to receiving said retransmitted reply message.
Claim 11
Dependent Claim
20 words
The apparatus of claim 8 wherein said means for demodulating and storing said first message includes a digital shift register.
Claim 12
Dependent Claim
20 words
The apparatus of claim 8 wherein said first time interval is in the range of from 50 to 150 us.
Claim 13
Dependent Claim
19 words
The apparatus of claim 8 wherein said second time interval is in the range from 10 to 25 us.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-01-31 | 1992-08-01 | 1993-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-01-31 | 1996-08-01 | 1997-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-01-31 | 2000-08-01 | 2001-01-31 | $7700.00 | Window Closed / Lapsed |