# US 8,886,134 B2 · Monitoring system for a doppler transceiver > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,886,134 B2 - Document ID: US8886134B2 - Status: Granted - Kind: B2 - Application number: 13/191,382 - Filed: 2011-07-26 - Published: 2012-01-26 - Granted: 2014-11-11 - Earliest claimed: 2010-07-26 - Assignees: Bea SA - Applicants: Yves Borlez; Soufien Menai - Inventors: Yves Borlez; Soufien Menai - Web page: https://patentgrep.com/patent/US8886134B2 ## CPC - G01S 7/4052: {by simulation of echoes} - G01S 7/4017: {of HF systems} - G01S 13/50: Systems of measurement based on relative movement of target - G01S 13/753: {using frequency selective elements, e.g. resonator} - G01S 13/756: {using a signal generator for modifying the reflectivity of the reflector (G01S13/758 takes precedence)} - G01S 13/758: {using a signal generator powered by the interrogation signal} - G01S 7/036: {involving a transfer mixer} - G01S 7/4078: {involving an integrated reference reflector or reference transponder} - G01S: RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES ## Abstract The invention relates to a method for monitoring the integrity of a Doppler transceiver, where a Doppler transceiver comprises a transmitter unit, a receiver unit and a mixer unit, where a signal is transmitted from the transmitter characterized in that the transmitted signal is at least partially coupled into a modulation unit, where the coupled signal is modulated according to certain parameters, and the modulated signal is transmitted to the receiver unit. The invention also relates to a Doppler transceiver comprising a transmitter unit and a receiver unit having at least one antenna (34, 54, 66, 74, 90, 96) and a mixer unit (38, 64), characterized in that it also comprises a modulation unit (48, 70, 86, 106) which is electrically disconnected to the antenna (34, 54, 66, 74, 90, 96). ## Claims ### Claim 1 Method for monitoring the integrity of a Doppler transceiver, said Doppler transceiver includes a transmitter unit which includes a transmitting antenna, a receiver unit which includes a receiving antenna, at least one mixer unit, a processor unit, and, a signal transmitted from said transmitting antenna of said transmitter unit, comprising the steps of: transmitting, using said transmitting antenna, partially, said transmitted signal into a modulation unit using a transmitted signal path, said modulation unit integrated between said transmitting antenna and said receiving antenna; said processing unit triggering said modulated signal utilizing a separate path other than said signal path between said transmitting antenna and said modulation unit; modulating said transmitted signal according to certain parameters; transmitting using said modulation unit said modulated signal back to said receiving antenna of said receiver unit; mixing said received signal and said transmitted signal in said mixer unit to detect signal modulation; and, processing said modulated signal in said processing unit and classifying said modulated signal as a correct response of said transceiver under applied calibrated stimulation. ### Claim 2 (depends on 1) Method according to claim 1, further comprising the steps of: reflecting, using said modulation unit, said modulated signal back to at least a single transmit/receive antenna. ### Claim 3 (depends on 1) Method according to claim 1, further comprising the steps of: coupling, using a coupling unit, said transmitted signal into said modulation unit. ### Claim 4 (depends on 1) Method according to claim 1, further comprising the steps of: coupling, using a coupling unit, said modulated signal into said receiver unit. ### Claim 5 (depends on 1) Method according to claim 1, further comprising the steps of: mixing said received modulated signal with said transmitted signal and obtaining a demodulated IF signal. ### Claim 6 (depends on 5) Method according to claim 5, further comprising the steps of: comparing, using a processing unit, said IF signal to expected values. ### Claim 7 (depends on 1) Method according to claim 1, wherein said modulation shifts phase and/or amplitude and/or frequency of said transmitted signal. ### Claim 8 (depends on 1) Method according to claim 1, wherein said certain parameters relate to amplitude, frequency, and/or phase. ### Claim 9 Doppler transceiver, comprising: a transmitter unit and a receiver unit which utilize a signal path, said transmitter unit includes at least one antenna, and, said receiver unit includes at least one antenna; a mixer unit; a modulation unit integrated between said at least one antenna of said transmitter unit and said at least one antenna of said receiver unit, said modulation unit is coupled to at least one antenna of said transmitter unit and said at least one antenna of said receiver unit; a processing unit triggering and controlling said modulation unit by a link independent of said signal path. ### Claim 10 (depends on 9) Doppler transceiver according to claim 9, wherein said modulation unit is wirelessly coupled to said antenna. ### Claim 11 (depends on 9) Doppler transceiver according to claim 9, wherein said transmitter unit and said receiver unit use a single antenna. ### Claim 12 (depends on 9) Doppler transceiver according to claim 9, wherein said at least one transmitter antenna and said at least one receiver antenna operate at RF-frequencies. ### Claim 13 (depends on 9) Doppler transceiver according to claim 9, wherein said transceiver is a microwave sensor and/or a radar sensor. ### Claim 14 (depends on 9) Doppler transceiver according to claim 9, wherein said modulation unit is arranged in the vicinity of said antenna. ### Claim 15 (depends on 9) Doppler transceiver according to claim 9, wherein said modulation unit and said antenna reside on the same substrate. ### Claim 16 (depends on 9) Doppler transceiver according to claim 9 wherein said modulation unit modulates said transmitted signal according to certain parameters. ### Claim 17 (depends on 16) Doppler transceiver according to claim 16 wherein said certain parameters relate to amplitude, frequency, and/or phase. ### Claim 18 Method for monitoring the integrity of a Doppler transceiver, said Doppler transceiver includes a transmitter unit, a receiver unit, at least one mixer unit, a processing unit, and, a signal transmitted from said transmitter unit, comprising the steps of: transmitting, partially, said transmitted signal to a modulation unit; triggering, using said processing unit, said modulation unit and modulating said transmitted signal according to defined parameters; transmitting said modulated signal back to said receiver unit; mixing said received signal and said transmitted signal in said mixer unit to obtain an IF signal; and, processing said IF signal in said processing unit and comparing said IF signal to an expected value to determine when said transceiver system is functioning correctly. ### Claim 19 (depends on 18) Method according to claim 18 wherein: said defined parameters relate to amplitude, frequency and/or phase; and, said modulation unit is triggered periodically or permanently.