摘要 |
The invention relates to a driver assistance device (2) for a vehicle (1), which driver assistance device has a radar appliance (3, 4) for determining measured variable (α1, α2, R1, R2) referenced to an object (10) that is external to the vehicle, wherein the radar appliance (3, 4) comprises: at least a first and a second reception antenna (14, 15), each for receiving signals (SE1, SE2); a first down-converter (17), which is coupled to the first reception antenna (14) via a first reception path (16), and a second down-converter (23), which is coupled to the second reception antenna (15) via a second reception path (21), for down-converting the received signals (SE1, SE2) into respective baseband signals (SB1, SB2); a control device (5) for determining the measured variable (α1, α2, R1, R2) using the baseband signals (SB1, SB2); and test means (32) for producing a local check signal (SP) and for coupling the check signal (SP) into the first reception path (16) and into the second reception path (21), as a result of which the control device (5) receives the check signal (SP) that has been down-converted by the first down-converter (17) as a first test signal (ST1) and the check signal (SP) that has been down-converted by the second down-converter (23) as a second test signal (ST2). The control device (5) uses the test signals (ST1, ST2) to determine a frequency-dependent correction variable (δ(F)) for correcting the measured variable (α, α2, R1, R2). The invention also relates to an appropriate method. |
主权项 |
1. A driver assistance device for a vehicle, comprising a radar appliance for determining at least one measured variable referenced to an object that is external to the vehicle, wherein the radar appliance comprises:
at least a first and a second reception antenna, each for receiving signals, a first down-converter, which is coupled to the first reception antenna via a first reception path, and a second down-converter, which is coupled to the second reception antenna via a second reception path, each for down-converting the received signals into respective baseband signals, a control device for receiving the baseband signals and for determining the at least one measured variable using the baseband signals, and test means for producing a local check signal and for coupling same check signal firstly into the first reception path and secondly into the second reception path, as a result of which the control device receives firstly the check signal that has been down-converted by the first down-converter as a first test signal and secondly the check signal that has been down-converted by the second down-converter as a second test signal, wherein the control device is designed to use the test signals to determine a correction variable for correcting the measured variable, wherein the control device is designed to use the test signals to determine the correction variable as a frequency-dependent variable.
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