Method of operating a digital radar or sonar apparatus
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
G01S-007/292
G01S-007/282
G01S-013/10
G01S-007/527
G01S-007/285
G01S-007/34
G01S-007/526
G01S-007/529
G01S-007/62
G01S-013/89
G01S-015/10
G01S-015/89
G01S-007/06
출원번호
US-0702498
(2015-05-01)
등록번호
US-9372257
(2016-06-21)
우선권정보
GB-0717031.9 (2007-08-31)
발명자
/ 주소
Jales, Richard
Lawrence, Andrew
Maindrou, Matthieu
출원인 / 주소
Raymarine UK Limited
대리인 / 주소
Haynes and Boone, LLP
인용정보
피인용 횟수 :
0인용 특허 :
72
초록▼
A radar or sonar system amplifies the signal received by an antenna of the radar system or a transducer of the sonar system is amplified and then subject to linear demodulation by a linear receiver. There may be an anti-aliasing filter and an analog-to-digital converter between the amplifier and the
A radar or sonar system amplifies the signal received by an antenna of the radar system or a transducer of the sonar system is amplified and then subject to linear demodulation by a linear receiver. There may be an anti-aliasing filter and an analog-to-digital converter between the amplifier and the linear receiver. The system may also have a digital signal processor with a network stack running in the processor. That processor may also have a network interface media access controller, where the system operates at different ranges, the modulator may produce pulses of two pulse patterns differing in pulse duration and inter-pulse spacing, those pulse patterns are introduced and used to form two radar images with the two images being derived from data acquired in a duration not more than twenty times larger than the larger inter-pulse spacing, or for a radar system, larger than one half of the antenna resolution time. One or more look-up tables may be used to control the amplifier. The radar system may generate digital output which comprises greater than eight levels of radar video.
대표청구항▼
1. A method comprising: generating a sequence of pulse signals;converting the sequence of pulse signals to ranging signals, wherein the ranging signals are radar signals of a radar apparatus or sonar signals of a sonar apparatus;emitting the ranging signals;receiving passively reflected return signa
1. A method comprising: generating a sequence of pulse signals;converting the sequence of pulse signals to ranging signals, wherein the ranging signals are radar signals of a radar apparatus or sonar signals of a sonar apparatus;emitting the ranging signals;receiving passively reflected return signals in response to the ranging signals;amplifying the return signals, wherein the amplified return signals are analog signals;converting, by an analog-to-digital converter, the amplified return signals to digital signals;generating, by a linear demodulator, a digital output from the digital signals representing the amplified return signals; andprocessing the digital output for display and/or analysis. 2. The method of claim 1, wherein the linear demodulator is implemented by a linear receiver comprising a plurality of linear amplifiers. 3. The method of claim 1, further comprising filtering the amplified return signals by an anti-aliasing filter, wherein the analog-to-digital converter is a sub-sampling analog-to-digital converter. 4. The method of claim 3, wherein the filtering comprises restricting a bandwidth of the amplified return signals to satisfy the Shannon-Nyquist-Kotelnikov sampling theorem. 5. The method of claim 3, further comprising filtering the digital signals from the sub-sampling analog-to-digital converter. 6. The method of claim 1, further comprising displaying a pseudo-colour representation of an amplitude of the return signals from the digital output. 7. The method of claim 1, further comprising filtering the amplified return signals by an anti-aliasing filter, wherein the converting comprises converting the filtered amplified return signals to the digital signals. 8. The method of claim 1, wherein the processing is performed by a digital processor, the method further comprising running a network stack on the digital processor. 9. The method of claim 1, further comprising providing the digital output to a network unit comprising a media access controller and a physical layer interface. 10. The method of claim 1, wherein: the sequence of pulse signals comprises pulses of a first pulse pattern interleaved with pulses of a second pulse pattern;the first and second pulse patterns differ in pulse duration and inter-pulse spacing; andthe processing comprises generating a first image associated with the pulses of the first pulse type and a second image associated with the pulses of the second pulse type. 11. The method of claim 10, wherein the sequence of pulse signals comprises a plurality of the pulses of the second type interleaved between successive pulses of the first type. 12. The method of claim 1, further comprising controlling a gain of an amplifier performing the amplifying, wherein the controlling comprises using at least one look-up table containing data for compensating for range-dependent variation of the return signals. 13. The method of claim 12, wherein the at least one look-up table comprises multiple table regions each associated with a corresponding range. 14. The method of claim 12, wherein the controlling comprises using a plurality of look-up tables each associated with a corresponding range. 15. The method of claim 1, further comprising controlling a gain of an amplifier performing the amplifying, wherein the amplifier comprises a plurality of gain stages, wherein the controlling comprises using at least one look-up table containing data for at least one of the gain stages. 16. The method of claim 15, wherein the at least one look-up table comprises multiple table regions each associated with a corresponding one of the gain stages. 17. The method of claim 15, wherein the controlling comprises using a plurality of look-up tables each associated with a corresponding one of the gain stages. 18. The method of claim 17, further comprising: adding together outputs from the plurality of look-up tables; andapplying saturation logic to the added-together outputs to control the amplifier within a gain control range. 19. The method of claim 1, further comprising applying non-linear dynamic range matching to the digital output. 20. The method of claim 1, wherein: the ranging signals are radar signals;the ranging signals and the received return signals are X-band signals;the method further comprises converting the X-band return signals to intermediate frequency return signals;the amplifying comprises amplifying the intermediate frequency return signals;the filtering comprises filtering the amplified intermediate frequency return signals;the analog-to-digital converter is a sub-sampling analog-to-digital converter; andthe converting comprises sampling the filtered amplified intermediate frequency return signals at a sample rate less than the intermediate frequency.
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