Importance

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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. A hold mode is provided with respect to the radar device so that radiated RF energy is controlled to decrease the probability of detection by a traffic radar detector. The radar device is also capable of converting from one unit of measure to another without modification of the associated time base. As a further check on accuracy, the device includes the ability to determine the calibration of the time base within the radar system and to control the display based on the time base calibration. High speed lock onto a target vehicle speed is also provided along with the unique 'power-on' calibration sequence. x

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First Claim