Random pulse type radar apparatus
First Claim
1. A random pulse type radar apparatus comprising:
- a transmitter for generating a hybrid type spectrum spread signal by simultaneously using two kinds of modulations which are phase shift keying (PSK) modulation for selecting a phase of a transmission radio wave in accordance with a pseudo noise digital code and outputting said transmission wave, and time hopping modulation for stopping transmission of a radio wave at random in accordance with said pseudo noise digital code;
a receiving unit for selectively detecting an echo of a transmission signal radio wave, generated by said transmitter, from a target with a time delay;
at least one a common antenna unit for use both for transmission and reception or antenna units installed close to each other and respectively serving single functional units; and
a reception control unit for stopping an action of said receiving unit in a time zone in which said transmitter is outputting radio waves in accordance with said time hopping modulation, whereby a spatial distribution of an intensity of an echo of a transmitted radio wave is measured through computation of a cross-correlation function of a transmission signal and a reception signal.
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Accused Products
Abstract
A random pulse type radar apparatus sends out as an output signal a spectrum spread radio wave including a pseudo random signal-less period and receives echoes in this signal-less period to thereby significantly reduce transmission peak power. The random pulse type radar apparatus comprises a transmitter for generating a hybrid type spectrum spread signal by simultaneously using two kinds of modulations which are phase shift keying modulation for selecting a phase of a transmission radio wave in accordance with a pseudo noise digital code and outputting the transmission wave, and time hopping modulation for stopping transmission of a radio wave at random in accordance with the pseudo noise digital code; a receiving unit for selectively detecting an echo of a transmission signal radio wave, generated by the transmitter, from a target with a time delay; at least one a common antenna unit for use both for transmission and reception or antenna units installed close to each other and respectively serving single functional units; and a reception control unit for stopping an action of the receiving unit in a time zone in which the transmitter is outputting radio waves in accordance with the time hopping modulation, whereby a spatial distribution of an intensity of an echo of a transmitted radio wave is measured through computation of a cross-correlation function of a transmission signal and a reception signal.
50 Citations
12 Claims
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1. A random pulse type radar apparatus comprising:
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a transmitter for generating a hybrid type spectrum spread signal by simultaneously using two kinds of modulations which are phase shift keying (PSK) modulation for selecting a phase of a transmission radio wave in accordance with a pseudo noise digital code and outputting said transmission wave, and time hopping modulation for stopping transmission of a radio wave at random in accordance with said pseudo noise digital code;
a receiving unit for selectively detecting an echo of a transmission signal radio wave, generated by said transmitter, from a target with a time delay;
at least one a common antenna unit for use both for transmission and reception or antenna units installed close to each other and respectively serving single functional units; and
a reception control unit for stopping an action of said receiving unit in a time zone in which said transmitter is outputting radio waves in accordance with said time hopping modulation, whereby a spatial distribution of an intensity of an echo of a transmitted radio wave is measured through computation of a cross-correlation function of a transmission signal and a reception signal. - View Dependent Claims (3, 4, 5, 7, 8, 9, 11, 12)
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2. A random pulse type radar apparatus comprising:
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a transmitter for generating a hybrid type spectrum spread signal by simultaneously using two kinds of modulations which are frequency shift keying (FSK) modulation for selecting a frequency of a transmission radio wave in accordance with a pseudo noise digital code and outputting said transmission wave, and time hopping modulation for stopping transmission of a radio wave at random in accordance with said pseudo noise digital code;
a receiving unit for selectively detecting an echo of a transmission signal radio wave, generated by said transmitter, from a target with a time delay;
at least one common antenna unit for use both for transmission and reception or antenna units installed close to each other and respectively serving single functional units; and
a reception control unit for stopping an action of said receiving unit in a time zone in which said transmitter is outputting radio waves in accordance with said time hopping modulation, whereby a spatial distribution of an intensity of an echo of a transmitted radio wave is measured through computation of a cross-correlation function of a transmission signal and a reception signal. - View Dependent Claims (6, 10)
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Specification