Systems and methods for providing trigger timing
First Claim
Patent Images
1. A system for providing trigger pulses for triggering transmit and receive pulses in a radar system, the system comprising:
- an equivalent time sampling unit configured to provide transmit and receive trigger pairs, each trigger pair including a transmit trigger pulse and a corresponding receive trigger pulse, there being a varying delay between each transmit trigger pulse and the corresponding receive trigger pulse; and
a control unit comprising a pseudorandom number generator configured to generate a sequence of number values that produces a substantially even distribution of number values throughout a range, the control unit configured to control said equivalent time sampling unit to provide a sequence of pseudorandom delay periods, each pseudorandom delay period of said sequence of pseudorandom delay periods being between one of said trigger pairs and a next of said trigger pairs, each pseudorandom delay period of said sequence of pseudorandom delay periods being based on a pseudorandom number value of the sequence of number values, the varying delay between each transmit trigger pulse and the corresponding receive trigger pulse being adjustable independent of the sequence of pseudorandom delay periods;
wherein the system is configured to be included in a radar system having a receive circuitry bandwidth extending from fifty Megahertz to around ten Gigahertz such that each of the transmit trigger pulses causes a transmit pulse in the radar system and each of the corresponding receive trigger pulses causes a corresponding receive pulse in the radar system; and
wherein a length of the sequence of number values is chosen such that coherent noise is only detectable below fifty Megahertz.
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Accused Products
Abstract
A system for providing signal trigger pulses comprises an equivalent time sampling unit providing transmit and receive trigger pairs, and a control unit controlling the equivalent time sampling unit to provide pseudorandom delay length variations between the trigger pairs.
107 Citations
27 Claims
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1. A system for providing trigger pulses for triggering transmit and receive pulses in a radar system, the system comprising:
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an equivalent time sampling unit configured to provide transmit and receive trigger pairs, each trigger pair including a transmit trigger pulse and a corresponding receive trigger pulse, there being a varying delay between each transmit trigger pulse and the corresponding receive trigger pulse; and a control unit comprising a pseudorandom number generator configured to generate a sequence of number values that produces a substantially even distribution of number values throughout a range, the control unit configured to control said equivalent time sampling unit to provide a sequence of pseudorandom delay periods, each pseudorandom delay period of said sequence of pseudorandom delay periods being between one of said trigger pairs and a next of said trigger pairs, each pseudorandom delay period of said sequence of pseudorandom delay periods being based on a pseudorandom number value of the sequence of number values, the varying delay between each transmit trigger pulse and the corresponding receive trigger pulse being adjustable independent of the sequence of pseudorandom delay periods; wherein the system is configured to be included in a radar system having a receive circuitry bandwidth extending from fifty Megahertz to around ten Gigahertz such that each of the transmit trigger pulses causes a transmit pulse in the radar system and each of the corresponding receive trigger pulses causes a corresponding receive pulse in the radar system; and wherein a length of the sequence of number values is chosen such that coherent noise is only detectable below fifty Megahertz. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for producing and receiving signals in a radar system, said method comprising:
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performing equivalent time sampling by triggering transmit pulses followed by triggering corresponding receive pulses, there being a varying delay between each of the transmit pulses and the corresponding receive pulses; and separating subsequent transmit pulses by delay periods, variation in the lengths of said delay periods being pseudorandom and based upon a sequence of number values that produces a substantially even distribution of number values throughout a range, the delay between each of the transmit pulses and the corresponding receive pulses being adjustable independent of the pseudorandom delay periods; wherein the method is performed by a radar system having a receive circuitry bandwidth extending from fifty Megahertz to around ten Gigahertz and transmitting and receiving electromagnetic waves over the air; and wherein a length of the sequence of number values is chosen such that coherent noise is only detectable below fifty Megahertz. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A method for sampling a signal in a radar system, said method comprising:
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providing a series of transmit and receive pulse pairs, wherein a time offset between a transmit operation and a receive operation in a given pulse pair is varied from a previous pulse pair so that said series of pulse pairs samples a returned wave; and inserting delay periods between each said pulse pair and a next of said pulse pair, wherein variations in the delay periods between successive pulse pairs are pseudorandom and based upon a sequence of number values that produces a substantially even distribution of number values throughout a range, the time offset between the transmit operation and the receive operation in a given pulse pair being adjustable independent of the pseudorandom delay periods; wherein the receive pulse is sent to a radar system having a receive circuitry bandwidth extending from fifty Megahertz to around ten Gigahertz to cause the radar system to receive a signal; and wherein a length of the sequence of number values is chosen such that coherent noise is only detectable below fifty Megahertz. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23)
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24. A radar system transmitting a signal and receiving a returned signal, said radar system comprising:
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means for performing equivalent time sampling on said returned signal by providing transmit and receive trigger pairs, each trigger pair including a transmit trigger pulse and a corresponding receive trigger pulse, there being a varying delay between each transmit trigger pulse and the corresponding receive trigger pulse; and means for varying a delay in a pulse repetition scheme of said equivalent time sampling means by inserting delay periods between each of said trigger pairs and a next trigger pair, wherein variations in the delay periods between successive trigger pairs are pseudorandom and based upon a sequence of number values that produces a substantially even distribution of number values throughout a range, the delay between each transmit trigger pulse and the corresponding receive trigger pulse being adjustable independent of the pseudorandom delay periods; wherein a receive circuitry of the radar system has a bandwidth extending from fifty Megahertz to around ten Gigahertz; and wherein a length of the sequence of number values is chosen such that coherent noise is only detectable below fifty Megahertz. - View Dependent Claims (25, 26, 27)
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Specification