WO1994004939B1 - Interference avoidance system for vehicular radar system - Google Patents
Interference avoidance system for vehicular radar systemInfo
- Publication number
- WO1994004939B1 WO1994004939B1 PCT/US1993/007506 US9307506W WO9404939B1 WO 1994004939 B1 WO1994004939 B1 WO 1994004939B1 US 9307506 W US9307506 W US 9307506W WO 9404939 B1 WO9404939 B1 WO 9404939B1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- data storage
- coupled
- frequency
- signal
- interference
- Prior art date
Links
- 238000001514 detection method Methods 0.000 claims abstract 29
- 238000005070 sampling Methods 0.000 claims 16
- 238000011010 flushing procedure Methods 0.000 claims 6
- 230000000051 modifying Effects 0.000 claims 3
- 230000001702 transmitter Effects 0.000 claims 3
- 238000001228 spectrum Methods 0.000 abstract 1
Abstract
An interference avoidance system used in conjunction with a vehicular target detection system. The microwave transceiver section (102) of the vehicular target detection system, in which the present invention is incorporated, transmits and receives time-multiplexed microwave signals (104) having at least two channels (frequencies) spaced about 250 kHz apart. The time-multiplexed transmit signal is transmitted and strikes objects (targets) in the environment, and a portion of the transmit signal is reflected back to the antenna. A difference signal having a frequency equal to the difference between the frequency of the transmit and the received signal is generated, digitized, and a Fast Fourier Transform (FFT) is performed on the digitized difference signal. A microcontroller (106) analyzes the energy spectrum to determine whether there is interference present. If such interference is present, the microcontroller causes the transmit frequency to change until a frequency is found which is relatively free of the interference.
Claims
1. An interference avoidance system for detecting and avoiding interference in a vehicular target detection system, including: a) a vehicular target detection system for generat- ing at least a first and second transmit signal having different frequencies, and receiving signals including reflections of the transmit signals indicative of targets; and b) an interference detection system, coupled to the vehicular target detection system, for detecting whether interference is present in such received signals by determining the power level of a plurality of selected frequencies, averaging the power in each such selected frequency, and de- tecting that interference is present if the average power is greater than a reference value, and for causing the vehicular target detection system to change from at least the first transmit frequency to at least the second transmit fre- quency in response to such detection.
2. The interference avoidance system of claim 1, further including an oscillator modulation means, coupled to the microcontroller and the vehicular target detection system, for generating a control voltage controllable by the microcontroller.
3. The interference avoidance system of claim 2, wherein the oscillator modulation means is an analog circuit.
4. The interference avoidance system of claim 2, wherein the oscillator modulation means is a monolithic integrated digital to analog converter circuit.
5. The interference avoidance system of claim 1, wherein each transmit signal is a radio frequency signal, the target detection system is a radar system, and the interference detection system includes: a) a difference detection means, coupled to the vehicular radar system, for generating a differ¬ ence signal having a frequency equal to the difference between the frequency of one of the transmit signals and the received signal; b) a sampling means, coupled to the difference detection means, for sampling and digitizing the difference signal; c) a data storage means, coupled to the sampling means, for storing the digitized samples of the difference signal; and d) a mapping means, coupled to the data storage means, for mapping the digitized samples of the difference signal from the time domain to the frequency domain.
6. The interference avoidance system of claim 8, wherein each transmit signal is a two-frequency time-multi- plexed signal alternating between a first frequency and a second frequency.
7. An interference avoidance system for detecting and avoiding interference in a vehicular target detection system including: a) transmit means for transmitting at least one signal; b) receive means for receiving at least one signal; c) comparison means, coupled to the transmit means and the receive means, for comparing the trans¬ mitted signal with the received signal and gener- ating a difference signal based upon the compari¬ son; d) sampling means, coupled to the comparison means, for sampling and digitizing the difference sig¬ nal; e) data storage means, coupled to the sampling means, for storing the digitized samples of the difference signal; f) counter means, coupled to the sampling means, for determining whether at least 1,024 new samples have been stored in the data storage means; g) mapping means, coupled to the data storage means, for mapping the difference .signal from the time domain into the frequency domain using the last 1,024 new samples stored in the data storage means; h) interference detection means, coupled to the mapping means, for determining from the frequency domain representation of the last 1,024 new samples stored in the data storage means whether the power present in at least one selected fre¬ quency band is greater than at least one thresh¬ old value; i) flushing means, coupled to the mapping means and the interference detection means, for flushing the samples stored in the data storage means upon detection of interference; j) frequency control means, coupled to the interfer¬ ence detection means and the transmit means, for changing the frequency of the signal being trans- mitted; k) counter means, coupled to the sampling means, for determining whether at least 2,048 samples have been stored in the data storage means; 1) mapping means, coupled to the data storage means, for mapping the difference signal from the time domain into the frequency domain using the last 2,048 samples stored in the data storage means; m) interference detection means, coupled to the mapping means, for determining from the frequency domain representation of the last 2,048 samples stored in the data storage means whether the power present in at least one selected frequency band is greater than at least one threshold value; n) counter means, coupled to the sampling means, for determining whether at least 4,096 samples have been stored in the data storage means; o) mapping means, coupled to the data storage means, for mapping the difference signal from the time domain into the frequency domain using the last
4,096 samples stored in the data storage means; p) interference detection means, coupled to the mapping means, for determining from the frequency domain representation of the last 4,096 samples stored in the data storage means whether the power present in at least one selected frequency band is greater than at least one threshold value.
8. An method for detecting and avoiding interference in a vehicular target detection system including the steps of: a) transmitting at least one signal; b) receiving at least one signal; c) comparing the transmitted signals with the re¬ ceived signals and generating a difference signal based upon the comparison; d) sampling and digitizing the difference signal; e) storing the digitized samples of the difference signal in a data storage device; f) determining whether at least 1,024 new samples have been stored in the data storage device; g) repeating steps a) through f) until at least 1,024 new samples have been stored in the data storage device; h) mapping the difference signal from the time domain into the frequency domain using the last 1,024 new samples stored in the data storage device; i) determining from the frequency domain representa¬ tion of the last 1,024 new samples stored in the data storage device whether the power present in at least one selected frequency band is greater than at least one threshold value, and if so, then flushing the samples stored in the data storage device, changing the frequencies of the signals being transmitted, and returning to step a) ; otherwise j) determining whether at least 2,048 samples have been stored in the data storage device; k) repeating steps a) through k) until 2,048 samples have been stored in the data storage device; 1) mapping the difference signal from the time domain into the frequency domain using the last
2,048 samples stored in the data storage device; m) determining from the frequency domain representa¬ tion of the last 2,048 samples stored in the data storage device whether the power present in at least one selected frequency band is greater than at least one threshold value, and if so, then flushing the samples stored in the data storage device, changing the frequencies of the signals being transmitted, and returning to step a) ; otherwise n) determining whether at least 4,096 samples have been stored in the data storage device; o) repeating steps a) through e) , followed by steps 1) through o) until 4,096 samples have been stored in the data storage device; p) mapping the difference signal from the time domain into the frequency domain using the last 4,096 samples stored in the data storage device; q) determining from the frequency domain representa- tion of the last 4,096 samples stored in the data storage device whether the power present in at least one selected frequency band is greater than at least one threshold value, and if so, then flushing the samples stored in the data storage device, changing the frequencies of the signals being transmitted, and returning to step a) ; otherwise r) repeating steps a) through e) , followed by steps p) through r) .
9. The interference avoidance system of claim 1, wherein the reference value is determined by adding an offset value to a fixed value.
10. The interference avoidance system of claim 9, wherein the fixed value is directly input from an operator.
11. The interference avoidance system of claim 9, wherein the offset value is determined as a function of the power level determined in the selected frequencies.
12. The interference avoidance system of claim 1, wherein the reference value is dynamically determined by averaging the power level in a noise floor across a band of frequencies sampled at specified intervals in frequency and time and adding a predetermined fixed level above the average level of the noise floor, averaged over the specified frequency and time.
13. The interference avoidance system of claim 1, wherein the reference value is selected by direct input from an operator.
14. The interference avoidance system of claim 1, wherein the power of the selected frequencies is determined by mapping the received signals from the time domain into the frequency domain.
15. The interference avoidance system of claim 14, wherein the received signals are mapped from the time domain into the frequency domain by a fast Fourier transform operation.
16. An interference avoidance system for detecting and avoiding interference in a vehicular target detection system including: a) a transmitter for transmitting at least one signal; b) a receiver for receiving at least one signal; c) a comparator, coupled to the transmitter and the receiver, for comparing the transmitted signal with the received signal and generating a differ- ence signal based upon the comparison; d) a sampling circuit, coupled to the comparator, for sampling and digitizing the difference sig¬ nal; e) a data storage device, coupled to the sampling circuit, for storing the digitized samples of the difference signal; f) a counter, coupled to the sampling circuit, for determining the number of samples stored in the data storage device and representing that number as a count value; g) a mapping circuit, coupled to the data storage device, for mapping the difference signal from the time domain into the frequency domain using a selected number of the most recent new samples stored in the data storage device; h) an interference detection system, coupled to the mapping circuit, for determining from the fre¬ quency domain representation of the selected most recently sampled new samples stored in the data storage means whether the power present in at least one selected frequency band is greater than at least one threshold value; i) a flusher, coupled to the mapping circuit and the interference detection system, for flushing the samples stored in the data storage means upon detection of interference and for resetting the counter; j) a frequency controller, coupled to the interfer¬ ence detection system and the transmitter, for changing the frequency of the signal being trans¬ mitted.
17. The interference avoidance system of claim 16, wherein the selected number of most recent new samples used by the mapping circuit increases as the count value of the counter increases.
18. A method for detecting and avoiding interference of a vehicluar target detection system, including the following steps: a) generating at least a first and second transmit signal having different freqeuncies, and recevieing signals including reflections of the transmit signals indicative of targets; b) detecting interference is present in such re¬ ceived signals by determining the power level of a plurality of selected frequencies, averaging the power in each such selected frequency, and detecting that the average power is greater than a reference value. c) causing the vehicular target detection system to change from at least the first transmit frequency to at least the second transmit frequency in response to such detection.
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BR9306887A BR9306887A (en) | 1992-08-14 | 1993-08-09 | System and process for detecting and preventing interference in vehicle targets |
AU50034/93A AU673378B2 (en) | 1992-08-14 | 1993-08-09 | Interference avoidance system for vehicular radar system |
EP94908185A EP0655139B1 (en) | 1992-08-14 | 1993-08-09 | Interference avoidance system for vehicular radar system |
DE69329653T DE69329653T2 (en) | 1992-08-14 | 1993-08-09 | FAULT PREVENTION SYSTEM FOR VEHICLE RADAR SYSTEM |
AT94908185T ATE197509T1 (en) | 1992-08-14 | 1993-08-09 | INTERFERENCE AVOIDANCE SYSTEM FOR VEHICLE RADAR SYSTEM |
CA002141548A CA2141548C (en) | 1992-08-14 | 1993-08-09 | Interference avoidance system for vehicular radar system |
KR1019950700488A KR100254145B1 (en) | 1992-08-14 | 1993-08-09 | Interference avoidance system for vehicular radar system |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US07/930,760 US5280288A (en) | 1992-08-14 | 1992-08-14 | Interference avoidance system for vehicular radar system |
US930,760 | 1992-08-14 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO1994004939A1 WO1994004939A1 (en) | 1994-03-03 |
WO1994004939B1 true WO1994004939B1 (en) | 1994-03-31 |
Family
ID=25459721
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1993/007506 WO1994004939A1 (en) | 1992-08-14 | 1993-08-09 | Interference avoidance system for vehicular radar system |
Country Status (11)
Country | Link |
---|---|
US (1) | US5280288A (en) |
EP (1) | EP0655139B1 (en) |
JP (1) | JP3076177B2 (en) |
KR (1) | KR100254145B1 (en) |
AT (1) | ATE197509T1 (en) |
AU (1) | AU673378B2 (en) |
BR (1) | BR9306887A (en) |
CA (1) | CA2141548C (en) |
DE (1) | DE69329653T2 (en) |
MX (1) | MX9304938A (en) |
WO (1) | WO1994004939A1 (en) |
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1992
- 1992-08-14 US US07/930,760 patent/US5280288A/en not_active Expired - Lifetime
-
1993
- 1993-08-09 CA CA002141548A patent/CA2141548C/en not_active Expired - Fee Related
- 1993-08-09 AU AU50034/93A patent/AU673378B2/en not_active Ceased
- 1993-08-09 BR BR9306887A patent/BR9306887A/en not_active IP Right Cessation
- 1993-08-09 DE DE69329653T patent/DE69329653T2/en not_active Expired - Fee Related
- 1993-08-09 AT AT94908185T patent/ATE197509T1/en not_active IP Right Cessation
- 1993-08-09 EP EP94908185A patent/EP0655139B1/en not_active Expired - Lifetime
- 1993-08-09 KR KR1019950700488A patent/KR100254145B1/en not_active IP Right Cessation
- 1993-08-09 WO PCT/US1993/007506 patent/WO1994004939A1/en active IP Right Grant
- 1993-08-11 JP JP05199616A patent/JP3076177B2/en not_active Expired - Fee Related
- 1993-08-13 MX MX9304938A patent/MX9304938A/en not_active IP Right Cessation
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