Patent
Police radar detector including nuisance alert suppression
Reads0
Chats0
TLDR
In this article, a radar detector suppresses nuisance alerts due to detection of a third harmonic of a common LO signal of other radar detectors by detecting a second harmonic of the offending LO signal.Abstract:
A radar detector suppresses nuisance alerts due to detection of a third harmonic of a common LO signal of other radar detectors by detecting a second harmonic of the offending LO signal. If a detected radar signal in the Ka band is of a frequency within a suspect range corresponding to possible third harmonic spurious LO signals, a determination is made as to whether a potential alert blocking signal around the second harmonic of a nominal 11.55 Ghz signal is also present. In the illustrated embodiment, the second harmonic alert blocking signal which is checked has a frequency which is 2/3 the frequency of the detected Ka signal ± a guard band of, for example ±40 Mhz, and is within a range of frequencies from about 22.813 Ghz to about 23.8 Ghz. If no blocking signal has been detected within about 10 seconds before or within three sweeps after detection of the Ka band signal in the suspect range, the detected Ka band signal is reported. If a blocking signal is detected, the signal strength of the detected Ka band signal is examined relative to the signal strength of the blocking signal. If the Ka band signal strength is greater than a reporting threshold and also is greater than the signal strength of the blocking signal by a minimum threshold, the detected Ka band signal is reported. Otherwise the detected Ka band signal is treated as a nuisance signal generated by a nearby radar detector and suppressed.read more
Citations
More filters
Patent
Terrain awareness system with false alert suppression
Joel M. Wichgers,Richard D. Jinkins,Patrick D. McCusker,Richard M. Rademaker,Daniel L. Woodell +4 more
TL;DR: In this article, a terrain awareness and warning system includes electronics for receiving radar returns and providing terrain and/or obstacle alerts or warnings in response to the radar returns, and the electronics receive information from a database and the information is utilized to suppress false alerts and warnings.
Patent
Dual band superheterodyne receiver
TL;DR: In this article, a MMIC based superheterodyne receiver for converting at RF energy in an upper and a lower frequency band includes at least one attenuator for the RF energy input, a mixer for mixing the lower band input with a LO1 signal, another mixer to direct the LO 1 signal to the first mixer or to the second mixer, and a third mixer to mix a LO 2 signal with the first stage mixer output to produce a signal at the output frequency.
Patent
Wide band radar detector with three-sweep input stage
TL;DR: In this article, a police radar detector detects police radar signals in the X, K and wide Ka police radar bands and rejects interfering Ka band signals that are a higher harmonic of a nuisance source having a fundamental frequency adjacent to the X radar bands.
Patent
Police radar detector
TL;DR: In this paper, a novel frequency scheme for a police radar detector enables improved sweeping of the X, K, Ku and Ka radar bands, selectable, upper or lower, sideband suppression is employed to reduce undesired image sidebands and noise prior to the second frequency conversion.
Patent
Systems and methods for discriminating signals in a multi-band detector
TL;DR: In this article, a radar detector is operated to suppress nuisance radar alerts by identifying a first signal in radar band of interest, e.g., having a frequency that is a harmonic of a first nuisance local oscillator frequency leaked from a nearby radar detector and identifying a second signal having an frequency that was a harmonization of a second nuisance LOSO frequency where the first and second local oscillators are companion signals.
References
More filters
Patent
Wideband radar detector
Steven K. Orr,John Kuhn +1 more
TL;DR: In this article, a wideband radar detection apparatus includes a signal detection section, high rate signal processing section and a low rate processing section, which sweeps through a range of preselected frequencies and generates an output signal having a pair of single cycle sinusoids for every detected signal.
Patent
Motor vehicle police radar detector for detecting multiple radar sources
TL;DR: In this paper, a police radar signal detector detects and monitors radar signals from up to nine (9) radar sources until a detected radar signal has not been redetected for a given number of detector operations, or spectrum sweeps, or until the detected signal has been displaced by a higher priority radar signal.
Patent
Police radar detectors for detecting radar signals and determining the directional origin of the signal source
TL;DR: In this article, a police radar detector includes at least two antennas and preferably three or more antennas with detector circuitry shared among the antennas in a single detector housing, and the signals are detected in all antennas with the signal strengths in the different antennas being compared to determine the direction of origin of the signals.
Patent
Mixer using fundamental frequency or second or third harmonic frequencies of a local oscillator for maximized resultant frequency mixer product
TL;DR: In this article, a mixer is provided having a mixing element, an input signal port for incoming signals at a frequency fIN, a local oscillator signal port, and an output port from which the resultant frequency may be taken.
Patent
Radar detection and signal processing circuit
TL;DR: In this paper, the authors present a radar detection and signal processing circuit where, following a front end having an RF and local oscillator mixer to an I.F., which is then further mixed against a signal from a swept frequency oscillator, the output of a band pass filter goes to a detector for frequency modulated intermediate frequency signals, and that detector has at least a first output signal that is fed to two pairs of complementary paired comparators, the outputs of which are set to low and high threshold levels.