Abstract: A moving doppler radar unit capable of separating the incoming doppler signal into its respective frequency components by means of frequency translation techniques and fixed frequency filters is disclosed. When the radar platform vehicle and target vehicle are both moving, the received doppler signal is a complex wave having frequency components related to the ground speed of the platform vehicle and the relative speed of the platform and target vehicles with respect to each other.

Abstract: A traffic radar device has a microprocessor controlled system for facilitating the Doppler signal processing. Related circuits enable the Doppler signal to be gathered on a digital basis and arrayed in the memory of the microprocessor unit. The array is then examined and by executing a predetermined algorithm, a decision is made as to whether or not a series of samples of Doppler signals, comprises within the array, represents a valid signal suitable for display as a number indicative of speed of a target vehicle.The microprocessor also controls a tracking filter system over the expected Doppler frequency range and has a duty factor modulation and tunable notch to facilitate the filter operation.The radar device includes a range control that limits the range of the detection of the target vehicle without affecting the detection of the platform vehicle speed.

Abstract: A digital display doppler radar unit has a moving mode and a stationary mode. The incoming doppler signal, which in the moving mode, represents both speed of the radar platform and speed of an approaching target vehicle, is separated into two signal components by selective filtering. One component represents the sum of the ground speeds for the radar platform and approaching vehicles. A time base is generated by a crystal control means and the time base is utilized for correlating the received doppler signals, indicative of speed, with the time base. Each doppler signal component is converted to binary coded decimal (BCD) information and a digital counter counts the cycles of each reeived doppler signal and compares the count with an amount previously stored. Circuit means are provided to validate the received doppler signal, allowing their continual processing only after a preselected number of valid comparisons are made.

Abstract: A digital display doppler radar unit has a moving mode and a stationary mode. The incoming doppler signal, which in the moving mode, represents both speed of the radar platform and speed of an approaching target vehicle, is separated into two signal components by selective filtering. One component represents the sum of the ground speeds for the radar platform and approaching vehicles. A time base is generated by a crystal control means and .[.the time base.]. is utilized for correlating the received doppler signals, indicative of speed, with the time base. Each doppler signal component is converted to binary coded decimal (BCD) information and a digital counter counts the cycles of each received doppler signal and compares the count with an amount previously stored. Circuit means are provided to validate the received doppler signal, allowing their continual processing only after a preselected number of valid comparisons are made.