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US 7,403,153 B2Granted
System and method for reducing a radar interference signal
AssigneeValeo Raytheon Systems, Inc.
InventorsThomas M. Kelly, Jr., R. Gregory Aeder, Walter Gordon Woodington
Life of this patent
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Abstract
A system and method are provided to reduce an interfering signal in a radar return signal for a frequency modulated continuous wave (FMCW) radar. Once the interfering signal is detected, an extent of the interfering signal is determined and the interfering signal is removed from the radar return signal. This allows the radar to detect a target in the presence of the interfering signal. The system and method can benefit any FMCW radar that is within the range of an interfering radar source (e.g. another FMCW radar, a police radar gun, a pulse radar, etc.) operating in the same frequency band as the FMCW radar.
Claims26
A method of processing a radar return signal, comprising:
- generating a first array having time sample elements with respective time sample values associated with the radar return signal;
- processing the first array to detect an interfering signal in the time sample elements, wherein the processing comprises:
- generating a second array having second array elements with respective second array values associated with the time sample values, wherein the second array values comprise at least one of slope values generated from differences of the time sample values, higher order derivative values generated from differences of differences of the time sample values, or power values, each power value generated by squaring a respective out of the time sample values;
- determining, from among the second array elements, second array elements indicative of the interfering signal, wherein the determining comprises:
- generating at least one threshold associated with the second array values;
- comparing the second array values with the at least one threshold;
- and detecting that the interfering signal exists if at least a selected number of the second array values exceed the at least one threshold;
- and
- identifying time sample elements in the first array indicative of the interfering signal by one-to-one mapping at least one of the second array elements indicative of the interfering signal to a corresponding at least one of the time sample elements, wherein the mapping does not alter the time sample values of the first array;
- and
- removing, from the same first array having the same time sample elements and the same time sample values, the identified time sample elements indicative of the interfering signal.
8 more elements
A method of detecting an interfering signal in a radar return signal, the method comprising:
- generating a first array having time sample elements with respective time sample values associated with the radar return signal;
- generating a second array having second array having second array elements with respective second array values associated with the time sample values, wherein the second array values comprise at least one of slope values generated from differences of the time sample values or higher order derivative values generated from differences of differences of the time sample values;
- generating at least one threshold associated with the second array values;
- comparing the second array values with the at least one threshold;
- and
- detecting that the interfering signal exists if at least a selected number of the second array values exceed the at least one threshold identifying time sample elements in the first array indicative of the interfering signal by one-to-one mapping at least one of the second array elements indicative of the interfering signal to a corresponding at least one of the time sample elements, wherein the mapping does not alter the time sample values of the first array.
3 more elements
System to process a radar return signal, comprising:
- a radar receiving module adapted to provide a downconverted signal;
- a radar signal sampling module coupled to the radar receiving module and adapted to provide a first array having time sample elements with respective time sample values associated with the downconverted signal;
- an interference detector coupled to receive the first array and adapted to detect an interfering signal in the time sample elements, wherein the interference detector includes an array processor adapted to generate a second array having second array elements with respective second array values associated with the time sample values, wherein the second array values comprise at least one of slope values generated from differences of the time sample values, higher order derivative values generated from differences of differences of the time sample values, or power values, each power value generated by squaring a respective one of the time sample values wherein the array processor is further adapted to generate at least one threshold associated with the second array values, to compare the second array values with the at least one threshold, and to determine that the interfering signal exists in response to at least a selected number of the second array values exceeding the at least one threshold;
- an interference extent processor coupled to the interference detector and adapted to identify time sample elements in the first array indicative of the interfering signal by determining, from among the second array elements, second array elements indicative of the interfering signal, and adapted to one to one map at least one of the second array elements indicative of the interfering signal to a corresponding at least one of the time sample elements, wherein the mapping does not alter the time sample values of the first array;
- and
- an interference removal processor coupled to the interference extent processor and adapted to remove, from the same first array having the same time sample elements and the same time sample values, the identified time sample elements associated with the interfering signal.
3 more elements
Dependencies are inferred from the claim text.