Patent ID: 8169359
Filing Date: 2012-05-01
Classification: G01S

Abstract:
1. A pulse Doppler radar device, comprising: a judging and controlling part for receiving a predetermined judgment reference data and judging an operation mode; a wide band impulse generating part including a pulse Doppler transmitting and receiving part for transmitting outside the pulse generated in the wide band impulse generating part as a transmitting pulse, receiving a reflected pulse reflected by an object and returned therefrom, and outputting quadrature phase I and Q signals by performing a quadrature phase detection for the reflected pulse using a carrier wave of the transmitting pulse; a range gate setting part for determining a timing for sampling the quadrature phase I and Q signals based on a delay time for each of range gates from the generation of the seed pulse, and outputting a range gate signal with the timing; a bandwidth limiting part for receiving the quadrature phase I and Q signals from the pulse Doppler transmitting and receiving part, and limiting the quadrature phase I and Q signals within a band limiting width set based on the result of the judgment of the operation mode; an A/D-converting part for receiving the quadrature phase I and Q signals from the bandwidth limiting part, and A/D-converting the quadrature phase I and Q signals with the timing with which the range gate signal is input from the range gate setting part; a presum part for receiving a digital value for each of the A/D-converted quadrature phase I and Q signals from the A/D-converting part, and outputting integrated I and Q signals by integrating the digital values for each of the quadrature phase I and Q signals by a predetermined number of times; and an instruction executing part for determining the delay time for each of the range gates and outputting the delay time to the range gate setting part, receiving the integrated I and Q signals from the presum part, performing a frequency analysis for all of the range gates to calculate an amplitude output for each of the range gates and an amplitude output for each of frequency gates, judging whether there is or not an object by comparing the amplitude output for each of the range gates and the amplitude output for each of the frequency gates with a predetermined threshold, and calculating a range to and a relative velocity of the object based on the range gate and the frequency gate where the object is detected.