Abstract: A radar detector includes a graphical display for displaying a spectral representation of detected signals.

Abstract: An emergency vehicle contains a transmitter for generating and transmitting a pair of fixed continuous wave signals which are distinguishable from each other in a preselected frequency band. A passenger vehicle contains a receiver which detects and distinguishes the pair of signals and generates an alert if the signals are determined to be at predetermined frequencies.

Abstract: A personnel monitoring apparatus has a transmitter for transmitting a data encoded signal. A strap is provided for coupling the transmitter to a person to be monitored. An emitter is attached to the transmitter for emitting an optical signal. A detector is attached to the transmitter for detecting the optical signal. An optical fiber is incorporated with the strap for optically coupling the emitter and the detector. A comparator compares the optical signal and a reference signal, and the result of the comparison sets the value of a preselected data bit in the data encoded signal.

Abstract: A pulsed-laser radar detection apparatus includes a decision network coupled to a photodetector. The decision network generates an output pulse when a signal detected by the photodetector is a valid signal according to predefined criteria which are implemented in the decision network. An indicator provides an audible or visual indication that a valid signal has been detected. According to the present invention, a Q-switched modulator is provided in the field of view of the photodetector to generate a simulated valid signal. A test switch is connected in series with the modulator such that closing the test switch causes a simulated valid signal to be generated by the modulator.

Abstract: A method and apparatus for determining the strength and proximity of a pulsed-laser radar signal is provided. A photodetector detects signals and provides the signals to a decision network. The decision network evaluates the signals and generates an output pulse when a detected signal is a valid signal according to predetermined criteria implemented in the decision network. A processor is coupled to the decision network for counting output pulses. A threat indicator is driven by the processor in proportion to the output pulse count.

Abstract: A photodetector receives an optical signal and converts it an electrical signal. A pulse stretcher converts the electrical signal into a first signal which is characterized by having an increased pulse width relative to the electrical signal. A noise averager converts the electrical signal into a second signal which is representative of the average noise component of the electrical signal. A threshold reference is generated as a linear function of the potential difference between the first signal and the second signal. A first comparator compares the magnitude of the first signal and the threshold reference signal and generates a first logic output which is true if the magnitude of the first signal is greater than the magnitude of the threshold reference signal.

Abstract: A police radar warning receiver includes an auto-mute feature by which a driver may be alerted to the presence of police radar but without the annoyance of an unnecessarily prolonged audible alarm. To this end, upon detection of the police radar signal, an audible alarm begins to beep at a selected intensity and at a beep rate corresponding to the strength of the signal. A predetermined time and/or a predetermined number of beeps after detection of the police radar signal, the intensity of the audible alarm is automatically reduced.

Abstract: A police radar warning receiver includes a DSP circuit having a correlator, multiple array averager and a peak detector to provide after each sweep of a swept local oscillator respective dynamic thresholds associated with each averager array and against which information from that sweep is evaluated to determine whether to generate an alarm enable indicative of receipt of a police radar signal. The multiple averager arrays allow for different averaging or weighting ratios to maximize sensitivity of the receiver on the one hand and enhance response time on the other rather than trading off one for the other.

Abstract: A bracket and assembly for remotely mounting a radar detector includes a bracket that secures a license plate to a first end of the vehicle, with the radar detector supported therebetween and a receiving end of the radar detector facing a bottom edge portion of the bracket. The bottom edge portion includes a horizontally disposed lip that supports a reflector at an angle. The bottom edge portion also has a vertically disposed lip which hides the reflector from view, but is transparent to radar signals. The reflector intercepts police radar signals directed toward the first end of the vehicle and reflects the signals upwardly into the receiving end of the radar detector.

Abstract: A police radar warning receiver is disclosed including a DSP circuit having a correlator and a peak detector to provide after each sweep of a swept local oscillator a dynamic threshold for that sweep as affected by all prior sweeps and against which information from that sweep is evaluated to determine whether to generate an alarm enable indicative of receipt of a police radar signal.

Abstract: In a police radar warning receiver with a self-contained battery source of supply, battery life may be prolonged by duty cycling the RF front end circuitry of the receiver and, especially, the swept oscillator thereof at a duty cycle rate not greater than 25% with the circuitry being energized not more than once every approximately one-half second.

Abstract: A police radar warning receiver includes a DSP circuit having a correlator and a peak detector to provide after each sweep of a swept local oscillator a dynamic threshold for that sweep as affected by all prior sweeps and against which information from that sweep is evaluated to determine whether to generate an alarm enable indicative of receipt of a police radar signal.

Abstract: A police radar warning receiver is disclosed including a DSP circuit having a correlator and a peak detector to provide after each sweep of a swept local oscillator a dynamic threshold for that sweep as affected by all prior sweeps and against which information from that sweep is evaluated to determine whether to generate an alarm enable indicative of receipt of a police radar signal.

Abstract: A remotely mounted radar detector is mounted vertically behind a license plate with a reflector attached to the horn at an angle such that the reflector extends beyond one edge of the license plate to reflect incoming, horizontal radar signals into a vertically oriented plane and to the horn antenna. Preferably, a bracket snugly secures the license plate to the one end of the vehicle, with the radar detector sandwiched therebetween and facing downardly. The bottom portion of the bracket has a horizontal lip spaced from the bottom edge of the license plate so as not to obstruct incoming radar signals that pass therebetween enroute to the reflector. The bottom portion also has a vertical lip with a window, thereby to substantially hide the reflector from view and at the same time to permit passage therethrough of radar signals to the reflector.

Abstract: An adjustable angle mount particularly useful for removably supporting a police radar detector horizontally to the inside of any of a variety of vehicle windshields of various inclination angles. The mount has a pair of planar members hinged together at a horizontal axis, one member being attachable to the windshield by two horizontally spaced suction cups and with a third windshield contact point. Below the axis is a bearing surface against which a cam pinned to the other member bears, under the weight of a receiver removably supported thereon, to limit the angle between said members and support the receiver horizontally. The cam is rotatable by a driver accessible lever formed integrally of the cam.

Abstract: A visor clip for mounting a police radar detector to the visor of a vehicle having a parallelogram shaped linkage pivotally connected to the top of the detector supporting base. A clip arm is provided at the upper side of the linkage for engaging the top of a visor. The linkage is spring biased forward and downward. The clip arm is longer than the base so as to clamp the visor between the arm and the detector case, tightening the detector to the base to which the detector is removably attached. The tightening action of the arm operates to press against the detector case to hold the clip onto the detector when the combination is removed from the visor. Friction enhancing horizontal ridges on the underside of the forward end of the clip arm urge the linkage backward to raise the clip arm upward when the combination is pushed onto the edge of a visor.