IPC분류정보
| 국가/구분 |
United States(US) Patent
등록
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| 국제특허분류(IPC7판) |
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| 출원번호 |
US-0388877
(1995-02-15)
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발명자
/ 주소 |
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| 출원인 / 주소 |
- Northrop Grumman Corporation (Los Angeles CA 02)
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| 인용정보 |
피인용 횟수 :
52 인용 특허 :
0 |
초록
▼
A radar sensor/processor for intelligent vehicle highway systems. The radar sensor/processor provides the range, speed, identity of, and selective communications with, vehicles equipped with a transponder in a first cooperative interrogator/transponder mode, and provides information on the range and
A radar sensor/processor for intelligent vehicle highway systems. The radar sensor/processor provides the range, speed, identity of, and selective communications with, vehicles equipped with a transponder in a first cooperative interrogator/transponder mode, and provides information on the range and speed of vehicles without a, or with an inoperative, transponder in a second noncooperative mode. The interrogator includes a first direct digital synthesizer, with an associated first input binary tune register, for producing a sine wave output, a multiplier for multiplying the sine wave output to produce an X-band signal, and a bi-phase single sideband modulator which modulates the X-band signal with data to be transmitted. The interrogator receiver receives a returned transponder reply signal, and includes a balanced mixer for downconverting the reply signal. A down-converted carrier signal is extracted, and is an input to a control loop which includes a second direct digital synthesizer, its associated second input binary tune register, a phase detector, and an A/D converter. The control loop rapidly adjusts the count in the second binary tune register to bring the output frequency of the second direct digital synthesizer into exact correspondence with the down-converted carrier signal. A subtraction of the respective counts in the input binary tune registers for the first and second direct digital synthesizers is a measure of the vehicle speed.
대표청구항
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A transportation communication system between an interrogator and a vehicle equipped with a transponder, comprising an interrogator having a first direct digital synthesizer, with an associated first input binary tune register, for producing a sine wave output, a multiplier for multiplying the sine
A transportation communication system between an interrogator and a vehicle equipped with a transponder, comprising an interrogator having a first direct digital synthesizer, with an associated first input binary tune register, for producing a sine wave output, a multiplier for multiplying the sine wave output to produce an X-band signal, a modulator for modulating the X-band signal with data to be transmitted to produce an interrogator carrier signal which is directed to an antenna for broadcast, a transponder in the vehicle for receiving the broadcast signal and returning a transponder reply signal in response thereto, the antenna receives and directs the transponder reply signal to an interrogator receiver, which includes a balanced mixer for downconverting the transponder reply signal, the output of which includes the down-converted Doppler shifted carrier frequency, and a processing circuit produces a down-converted carrier signal, which is an input to a control loop comprised of a second direct digital synthesizer, its associated second input binary tune register, a phase detector receiving the down-converted carrier signal, and an analog to digital converter, to rapidly adjust the count in the second binary tune register to bring the output frequency of the second direct digital synthesizer into correspondence with the down-converted carrier signal, and a subtraction circuit for subtracting the respective counts in the input binary tune registers for the first and second direct digital synthesizers, which is a measure of the two way Doppler shift and vehicle speed.
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