Radar
First Claim
1. A radar comprising:
- a transmission section that switches between a first frequency and a second frequency to transmit a transmission wave having one of the first frequency and the second frequency;
a predetermined schedule generated on a basis of a pseudo noise code;
a switch period between the first frequency and the second frequency in the transmission wave equal to or larger than a period determined by a code length of the pseudo noise code;
a reception section that receives a reflected wave of the transmission wave transmitted by the transmission section;
a transmission switch section that switches between turning-on and turning-off of an operation of the transmission section at the predetermined schedule;
a delay section that delays the predetermined schedule;
a reception switching section that switches between turning-on and turning-off of an operation of the reception section according to the predetermined schedule delayed by the delay section;
a difference frequency processing section that outputs a difference frequency between the transmission wave and the reflected wave as a detection waveform; and
a calculation section that calculates a distance to an object on a basis of a delay amount, which the delay section gives to the predetermined schedule, when the detection waveform has a difference frequency between the first frequency and the second frequency.
1 Assignment
0 Petitions
Accused Products
Abstract
A radar has a transmission section, a reception section that receives a reflected wave of the transmission wave, a transmission switch section, a delay section that delays a predetermined timing, a reception switching section, a difference processing section, and a calculation section. The transmission section switches between a first frequency and a second frequency to transmit a transmission wave having one of the frequencies. The transmission switch section switches between turning-on and turning-off of an operation of the transmission section at the predetermined timing. The reception switching section switches between turning-on and turning-off of an operation of the reception section according to the timing delayed. The difference processing section outputs a difference between the transmission wave and the reflected wave. The calculation section calculates a distance on a basis of a delay amount, when a detection waveform has a difference frequency between the first frequency and the second frequency.
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Citations
7 Claims
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1. A radar comprising:
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a transmission section that switches between a first frequency and a second frequency to transmit a transmission wave having one of the first frequency and the second frequency; a predetermined schedule generated on a basis of a pseudo noise code; a switch period between the first frequency and the second frequency in the transmission wave equal to or larger than a period determined by a code length of the pseudo noise code; a reception section that receives a reflected wave of the transmission wave transmitted by the transmission section; a transmission switch section that switches between turning-on and turning-off of an operation of the transmission section at the predetermined schedule; a delay section that delays the predetermined schedule; a reception switching section that switches between turning-on and turning-off of an operation of the reception section according to the predetermined schedule delayed by the delay section; a difference frequency processing section that outputs a difference frequency between the transmission wave and the reflected wave as a detection waveform; and a calculation section that calculates a distance to an object on a basis of a delay amount, which the delay section gives to the predetermined schedule, when the detection waveform has a difference frequency between the first frequency and the second frequency. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification