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US6175324: Police radar detector

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Filing Information

Inventor(s) Michael David Valentine · Stephen Ray Scholl · Harry Joe Gould ·
Assignee(s) Valentine Research, Inc. ·
Attorney/Agent(s) King & Schickli, PLLC ·
Primary Examiner Bernarr E. Gregory ·
Application Number US9425388
Filing date 10/22/1999
Issue date 01/16/2001
Predicted expiration date 10/22/2019
U.S. Classifications 342/20  · 455/315  · 455/313  · 455/314  · 455/227  · 455/344  · 455/345  · 342/89  ·
International Classifications --
Kind CodeB1
International Classifications 342 98-103 · 342192-197 · 342 20 · 342 27 · 342 89 · 342175 · 4552261 · 455227 · 455228 · 455313 · 455314 · 455315 · 455344 · 455345 ·
22 Claims, 4 Drawings


Abstract

A novel frequency scheme for a police radar detector enables improved sweeping of the X, K, Ku and Ka radar bands. The novel frequency scheme requires two initial frequency conversions for detection of the X, K and Ka radar bands and a single initial frequency conversion for the Ku radar band with single initial frequency conversion being enabled by disabling the second mixer. During sweeping of the X, K and Ka bands, selectable, i.e., upper or lower, sideband suppression is employed to reduce undesired image sidebands and noise prior to the second frequency conversion. In addition, noise at the second IF frequency is reduced to prevent this noise from feeding through the second mixer into the second IF amplifier. During the Ku band sweep, the second mixer is bypassed and shunting of signals at the second IF frequency is disabled so that these signals enter the second IF amplifier.

Independent Claims | See all claims (22)

  1. 1. A police radar detector comprising: an antenna for receiving incoming electromagnetic signals; a first local oscillator generating a first local oscillator signal which is swept through a first range of frequencies to sweep the X, K and Ka radar bands and a second range of frequencies to sweep the Ku radar band; a first mixer coupled to said antenna and said first local oscillator for mixing said incoming electromagnetic signals with said first local oscillator signal to generate first intermediate frequency signals; a second local oscillator for generating a second local oscillator signal; a second mixer coupled to said first mixer for mixing said first intermediate frequency signals with said second local oscillator signal to generate second intermediate frequency signals at a second intermediate frequency; detector circuitry coupled to said second mixer for detecting received electromagnetic signals within the X, Ku, K and Ka radar bands; and signal conditioning and control circuitry for selectively enabling said second local oscillator when said X, K and Ka radar bands are swept and disabling said second local oscillator and bypassing said second mixer when said Ku radar band is swept.
  2. 15. A police radar detector comprising: an antenna for receiving incoming electromagnetic signals; a first local oscillator generating a first local oscillator signal which is swept through a range of frequencies to sweep the X, K and Ka radar bands; a first mixer coupled to said antenna and said first local oscillator for mixing said incoming electromagnetic signals with said first local oscillator signal to generate first intermediate frequency signals; a second local oscillator for generating a second local oscillator signal; a second mixer coupled to said first mixer for mixing said first intermediate frequency signals with said second local oscillator signal to generate second intermediate frequency signals at a second intermediate frequency; detector circuitry coupled to said second mixer for detecting received electromagnetic signals within the X, K and Ka bands; sideband suppression circuitry for suppressing an upper sideband signal or a lower sideband signal from said first intermediate frequency signal when said detector is sweeping the X, K and Ka radar bands; and signal conditioning and control circuitry for selectively enabling said sideband suppression circuitry for selectively enabling suppression of said upper sideband or said lower sideband.

References Cited

U.S. Patent Documents

Document NumberAssigneesInventorsIssue/Pub Date
US5068663* Valentine Research, Inc. Valentine et al. Nov 1991
US5461383 Yupiteru Industries Co., Ltd. Ono et al. Oct 1995
US5852417 Valentine Research, Inc. Valentine et al. Dec 1998
US5856801 Valentine Research, Inc. Valentine et al. Jan 1999
US5900832 Valentine Research, Inc. Valentine et al. May 1999
US5917441 Valentine Research, Inc. Valentine et al. Jun 1999
* cited by examiner

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