IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0997184
(2001-11-29)
|
우선권정보 |
JP-0209141 (2001-07-10) |
발명자
/ 주소 |
- Haruta, Tomohiro
- Miyoshi, Akito
|
출원인 / 주소 |
|
대리인 / 주소 |
Katten Muchin Zavis Rosenman
|
인용정보 |
피인용 횟수 :
1 인용 특허 :
4 |
초록
▼
The present invention relates to a receiving/transmitting apparatus for radiating a predetermined signal and receiving a signal arriving as a response to the radiated signal, and to a radar equipment in which the receiving/transmitting apparatus is installed. In the receiving/transmitting apparatus
The present invention relates to a receiving/transmitting apparatus for radiating a predetermined signal and receiving a signal arriving as a response to the radiated signal, and to a radar equipment in which the receiving/transmitting apparatus is installed. In the receiving/transmitting apparatus and the radar equipment according to the present invention, high coherency is reliably achieved without any great enlargement in hardware scale. Therefore, it is possible to realize with high reliability improvement in performance and reliability as well as price reduction, downsizing, and running cost reduction in apparatuses and systems to which the present invention is applied.
대표청구항
▼
The present invention relates to a receiving/transmitting apparatus for radiating a predetermined signal and receiving a signal arriving as a response to the radiated signal, and to a radar equipment in which the receiving/transmitting apparatus is installed. In the receiving/transmitting apparatus
The present invention relates to a receiving/transmitting apparatus for radiating a predetermined signal and receiving a signal arriving as a response to the radiated signal, and to a radar equipment in which the receiving/transmitting apparatus is installed. In the receiving/transmitting apparatus and the radar equipment according to the present invention, high coherency is reliably achieved without any great enlargement in hardware scale. Therefore, it is possible to realize with high reliability improvement in performance and reliability as well as price reduction, downsizing, and running cost reduction in apparatuses and systems to which the present invention is applied. ing a digital noise filter in each channel of said plurality of channels, said digital noise filter located between said quantizer and said digital decoder, said digital noise filter digitally filtering a digital signal output by said quantizer. 5. An analog to digital converter according to claim 3, wherein said gain element digitally modifies the amplitude of the digital signal to improve linearity and to decrease noise spurs in the digital output. 6. An analog to digital converter according to claim 3, wherein said channels in said plurality of channels are grouped as channel pairs and said analog input is divided between the optical encoding sampler circuits in each channel pair according to a first prescribed ratio and the two optical encoding sampler circuits are controlled to produce sampled optical signals with a phase shift of 180° between the sampled optical signals of the two optical encoding sampler circuits, and the gain elements in each channel pair digitally modify the amplitude of the digital signal output in each channel in the pair according to a second prescribed ratio. 7. An analog to digital converter according to claim 6, wherein said gain elements compensate for the division of the analog input between the optical encoding sampler circuits so as to improve linearity and decrease noise spurs in the digital output. 8. An analog to digital converter according to claim 3, wherein said channels in said plurality of channels are grouped as one or more channel groups, each channel group comprising two or more channels, and said analog input is divided between the channels in each channel group according to a prescribed ratio, and the gain elements in each channel adjust a channel signal output to maintain the prescribed ratio. 9. An analog to digital converter according to claim 1, wherein said optical encoding sampler circuit comprises: a single input, dual-output Mach-Zehnder interferometer, the single input of the Mach-Zehnder interferometer coupled to the optical pulse source; and a directional coupler switch coupled to the outputs of the Mach-Zehnder interferometer. 10. An analog to digital converter according to claim 1, wherein said optical encoding sampler circuit comprises: a directional coupler switch having two inputs and two outputs, one of the inputs being coupled to the optical pulse source; and a dual input, dual-output Mach-Zehnder interferometer, the dual inputs of the Mach-Zehnder interferometer coupled to the outputs of the directional coupler switch. 11. An analog to digital converter according to claim 1, wherein said optical encoding sampler circuit comprises an integrated optical encoding sampler. 12. An analog to digital converter according to claim 1, wherein said optical to electrical converter is a photodetector. 13. An analog to digital converter according to claim 1, wherein said encoding code sequence is a Hadamard sequence and said decoding code sequence is a Hadamard sequence. 14. An analog to digital converter according to claim 1, wherein digital decoder comprises a digital multiplier which multiplies said digital signal by said decoding code sequence. 15. An analog to digital converter according to claim 1, wherein the quantizer comprises a delta-sigma modulator-based analog-to-digital conversion circuit. 16. An analog to digital converter having an analog input and a digital output, the analog to digital converter comprising: means for producing optical pulses; a plurality of channels, each channel comprising: means for sampling and encoding the analog input with the optical pulses, thereby producing an encoded optical signal; means for converting the encoded optical signal to an electric signal; means for quantizing the electric signal, thereby producing a digital signal; and means for decoding the digital signal with a decoding code sequence, thereby producing a decoded digital signal; and means for summing together each decoded digital signal from e ach channel in the plurality of channels, thereby producing the digital output. 17. An analog to digital converter according to claim 16, wherein the means for sampling and encoding the analog input comprises: a dual output Mach-Zehnder interferometer coupled to the optical pulses and controlled by the analog input; and a directional coupler switch coupled to the outputs of the Mach-Zehnder interferometer and controlled by an encoding signal. 18. An analog to digital converter according to claim 16, wherein the means for sampling and encoding the analog input comprises: a directional coupler switch coupled to the optical pulses and controlled by an encoding signal; and a dual input, dual output Mach-Zehnder interferometer coupled to the outputs of the directional coupler switch and controlled by the analog input. 19. An analog to digital converter according to claim 16, wherein the means for sampling and encoding the analog input comprises an integrated optical encoding sampler. 20. An analog to digital converter according to claim 16, further comprising means for filtering the electric signal. 21. An analog to digital converter according to claim 16, further comprising means for filtering the digital signal. 22. An analog to digital converter according to claim 16, wherein said analog signal is encoded with a Hadamard sequence. 23. An analog to digital converter according to claim 16, wherein the means for quantizing the electric signal comprises a delta-sigma modulator. 24. An analog to digital converter according to claim 16, wherein the means for decoding the digital signal comprises a digital multiplier, the digital multiplier multiplying the digital signal by a decoding code sequence. 25. An analog to digital converter according to claim 16, further comprising means for digitally adjusting the digital signal. 26. An analog to digital converter according to claim 25, wherein said channels in said plurality of channels are grouped as channel pairs and said analog input is divided between the means for sampling and encoding the analog input in each channel pair according to a first prescribed ratio and the means for sampling and encoding the analog input are controlled to produce sampled optical signals with a phase shift of 180° between the sampled optical signals of the means for sampling and encoding the analog input, and the means for digitally adjusting the digital signal in each channel pair digitally modify the amplitude of the digital signal in each channel in the pair according to a second prescribed ratio. 27. An analog to digital converter according to claim 26, wherein said means for digitally adjusting the digital signal compensate for the division of the analog input between the optical encoding sampler circuits so as to improve linearity and decrease noise spurs in the digital output. 28. An analog to digital converter according to claim 26, wherein said channels in said plurality of channels are grouped as one or more channel groups, each channel group comprising two or more channels, and said analog input is divided between the channels in each channel group according to a prescribed ratio, and said means for digitally adjusting the digital signal in each channel adjust a channel signal output to maintain the prescribed ratio. 29. A method for converting an analog input signal to a digital output signal comprising the steps of: providing optical pulses; coupling the optical pulses to a plurality of converter channels; converting the optical pulses coupled to each channel converter channel to encoded optical samples of the analog input signal converting the encoded optical samples to an electric signal in each converter channel; quantizing the electric signal to produce a quantized digital signal in each converter channel; decoding the quantized digital signal with a decoding code sequence to produce a decoded digital signal in each converter channel; and summing together all the deco
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