Abstract: A Doppler shifted radar apparatus is disclosed for correct target identification with respect to surveillance of moving vehicles. More particularly, an improved system is disclosed that is fully programmable and configurable to a specific customer use such as a speed signal. One such configurable item is the output communications protocol. As an example, the customer can configure the speed limit, range, and/or direction of movement, standard or custom serial protocol and other unique features for a customer speed sign. Another feature is a real time clock to time stamp and store event data for future analysis. The apparatus also has a multi-voltage power supply for customer usage and versatility.

Abstract: Disclosed is a Doppler shifted radar apparatus for correct target identification with respect to surveillance of moving vehicles. More particularly, an improved radar detection system using two or more continuously transmitted frequencies is used. The multiple frequencies are directed toward target vehicles whereby the phase difference of the two or more reflected Doppler signals is calculated and subsequently used to accurately determine a target range, thereby displaying the closest vehicle and closest vehicle speed. Vehicle speed is determined with use of the standard Doppler frequency shift. The next closest and/or next faster vehicle speed can also be easily determined.

Abstract: A transceiver module for use in a police traffic surveillance radar system is provided which is of a smaller size and of a lighter weight than those traditionally available. The transceiver module includes a front, open-ended housing having a cavity, a transceiver assembly disposed within the cavity of the housing, and a radome fixedly secured over the opened end of the housing so as to enclose and hermetically seal the transceiver assembly within the cavity of the housing. The transceiver assembly is formed of an antenna card/plate subassembly, a diode housing subassembly, an oscillator/choke housing subassembly, and a printed circuit board subassembly all operatively interconnected together so as to form a fully integrated structure. As a result, the transceiver can overcome the space restrictions due to the requirement of passenger-side air bags.

Abstract: A traffic radar system is provided in which the speed of a target vehicle is determined by measuring the difference in frequency between a component of a doppler signal which has a frequency proportional to the relative speed of the target vehicle and a moving patrol vehicle and a reference signal having a frequency proportional to the speed of the patrol vehicle. The reference signal is developed from a tachometer device which generates a periodic signal having a frequency proportional to the rotational speed of a vehicle wheel and phase-locked loop arrangements including adjustable dividers are provided for locking an oscillator to the tachometer signal and generating a reference signal at a frequency proportional to the actual speed of the patrol vehicle. For calibration, a component of the doppler signal produced from reflections from stationary objects is used.

Abstract: Apparatus is provided for determining the frequency of unknown periodic input signals and primarily generally sinusoidal signals which may be accompanied by very substantial noise. More particularly, the system for determining the frequency of unknown periodic input signals accompanied by substantial noise is adapted to a unique traffic radar or doppler radar system. The apparatus includes a phase locked loop in which the incoming signal accompanied by noise is compared with the output from a voltage controlled oscillator to generate a synthetic signal which is substantially free of noise and is well adapted for counting, measuring and display circuitry to give a direct indication of the input signal frequency or a parameter directly related to that input signal frequency. Specifically in doppler radar systems the direct readout is in "miles per hour", a direct function of doppler frequency.

Abstract: Apparatus is provided for determining the frequency of unknown periodic input signals and primarily generally sinusoidal signals which may be accompanied by substantial noise. More particularly a unique traffic radar or doppler radar is provided employing such frequency measuring apparatus. The apparatus includes a phase locked loop in which a frequency multiplier effect is produced and in which a frequency 12 times the periodic input signal being subjected to measurement is employed for taking two independent samples of the input signal and providing a synthetic representation of that signal. The two samples are centered about quadrature time references and are preferably conterminous. This signal can be measured and utilized for speed measuring purposes and other purposes where the accurate measurement of a periodic signal accompanied by noise is desired.