Target ID with simple F.E.T analogue multiplier?

[dbanner]

Would this circuit topology work for such a task. In this circuit, Vout is proportional to V1*V2. The F.E.T's conductance are matched to within+\-5%

Can the circuit can be tweaked for X and R channel inputs to give target information.

What do you think? This circuit is featured in Wireless world Circard collection 1978. All the relevant math is there.

[Altra]

I think you need some kind of division function to get a target vector. Multiplying X x R does not let you know which is greater or lesser. One of the early Tesoros used a analog multiplier IC for target ID. If you look at the datasheet these chips also had a division function that was used. Is there any text description with your circuit?.

[Skippy]

If it helps anyone:

Page 126 of this pdf shows the circuit ( plus others on previous pages ):
Circard Collection 1978 | PDF

There are some nifty things that can be done with analogue multipliers/dividers. I like the one that calculates the vector amplitude A = sqrt ( X*X + Y*Y )
There are some excellent design resources for these IC's out there, mostly older app books from the 70's / 80's, really interesting stuff.
Update:
This is one I have in print and pdf:
Nonlinear Circuits Handbook, 1976 | Analog Devices

[pito]

ATtiny85
VDI=degrees(atan2(Yy,Xy));
Magn = sqrt(pow(Xy,2)+pow(Yy,2));

[Aziraphel]

If it helps anyone:
Page 126 of this pdf shows the circuit ( plus others on previous pages ):
Circard Collection 1978 | PDF

https://www.scribd.com/document/6661...ollection-1978
not the best way to leave links here, leading to a paid site when in 0.2 seconds Google shows that you can download it without any fuss from the magnificent site worldradiohistory.com