[특허]Vehicle collision radar with randomized FSK waveform

[미국특허] Vehicle collision radar with randomized FSK waveform 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G01S-013/93
출원번호	US-0352632 (1999-07-13)
발명자 / 주소	Farmer Michael E.
출원인 / 주소	Automotive Systems Laboratory, Inc.
대리인 / 주소	Lyon, P.C.
인용정보	피인용 횟수 : 76 인용 특허 : 7

초록 ▼

An automotive radar incorporates a repetitive randomized equivalent LFM sequence of frequencies for improved immunity to jamming from other automotive radars. Each frequency in the sequence is of sufficient duration to travel round trip over the detection range of the radar. The Doppler shift in the received signal is estimated by performing a spectral analysis on similar frequency components of the received signal, and is then removed from the entire received signal. The received signal is then reordered so as to form an equivalent LFM received signal, and is compared with a similarly reordered image of the transmitted signal so as to estimate the range to the target. The randomization sequence, initial start frequency, or initial start time of the repetitive sequence are varied to minimize the effects of jamming by other radars, and this variation can be directionally dependent.

대표청구항 ▼

[ I claim:] [18.] A radar, comprising:a. direct digital synthesizer for generating a first oscillation signal having a first frequency of oscillation;b. an intermediate frequency source for generating a second oscillation signal having a first frequency of oscillation;c. a first mixer operatively connected to said direct digital synthesizer and to said intermediate frequency source for generating from said first and second oscillation signals a third oscillation signal having a third frequency of oscillation;d. a direct reference oscillator for generating a fourth oscillation signal having a fourth frequency of oscillatione. a second mixer operatively connected to said direct reference oscillator and to the output of said first mixer for generating from said third and fourth oscillation signals a fifth oscillation signal having a fifth frequency of oscillation;f. a circulator operatively connected to the output of said second mixer;g. at least one transmitting antenna for illuminating the object with a transmitted RF signal, whereby said at least one transmitting antenna is operatively connected to said circulator, whereby said circulator couples said fifth oscillation signal into said at least one transmitting antenna, said at least one transmitting antenna radiates said fifth oscillation signal;h. at least one receiving antenna for receiving as a received RF signal a component of said transmitted RF signal reflected by the object, whereby said at least one receiving antenna is operatively connected to said circulator, said at least one receiving antenna receives said reflected component;i. a third mixer operatively connected to said circulator and to said direct reference oscillator, whereby said circulator couples said received RF signal into said third mixer and said third mixer generates from said received RF signal and said fourth oscillation signal an intermediate RF signal;j. a fourth mixer operatively connected to said direct digital synthesizer and to the output of said third mixer for generating from said first oscillation signal and said intermediate RF signal detected RF signal;k. a quadrature phase shifter operatively connected to the output of said fourth mixer for shifting the phase of said detected RF signal by ninety degrees so as to create a phase-shifted detected RF signal;l. a first analog-to-digital converter for sampling said detected RF signal;m. a second analog-to-digital converter for sampling said phase-shifted detected RF signal; andn. a signal processor operatively connected to said first and second analog-to-digital converters and to said direct digital synthesizer, whereby said signal processor controls the operating frequency of said DDS responsive to a pseudo-random code from said signal processor, said pseudo-random code comprises a plurality of levels, each said level maintained for a period of time, said plurality of levels are uniformly spaced when monotonically reordered, said period of time is sufficient for the round trip propagation of said transmitted RF signal to the target from the radar, said pseudo-random code is repeated as a repetitive sequence, the sampled signals from said first and second analog-to-digital converters are transformed to a measured complex amplitude, and said signal processor further comprises:(i) a memory for storing said measured complex amplitude in a first series;(ii) a memory for storing the complex amplitudes for similar frequency elements of said repetitive sequence as a second series, whereby said second series is calculated for each said frequency element;(iii) a memory for storing the Doppler shift of said received signal calculated by said signal processor from a spectral analysis of said second series;(iv) a memory for storing a third series formed by removing the Doppler shift from said first series;(v) a memory for storing a fourth series calculated by said processor from said third series by reordering said third series in order of increasing transmitted frequency;(vi) a memory for storing a fifth series comprising a representation of the transmitted RF signal in order of increasing transmitted frequency;(vii) a memory for storing as a sixth series the difference in frequency by said processor of said fourth and fifth series, whereby said processor calculates the range to the object from said sixth series.

이 특허에 인용된 특허 (7) 인용/피인용 타임라인 분석

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[미국특허] Vehicle collision radar with randomized FSK waveform 원문보기

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[미국특허] Vehicle collision radar with randomized FSK waveform 원문보기

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